US20090188315A1 - Instruments for flow meters - Google Patents
Instruments for flow meters Download PDFInfo
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- US20090188315A1 US20090188315A1 US12/418,754 US41875409A US2009188315A1 US 20090188315 A1 US20090188315 A1 US 20090188315A1 US 41875409 A US41875409 A US 41875409A US 2009188315 A1 US2009188315 A1 US 2009188315A1
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- Prior art keywords
- instrument
- flow meter
- flow
- fluid
- meter
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
- G01F15/065—Indicating or recording devices with transmission devices, e.g. mechanical
- G01F15/066—Indicating or recording devices with transmission devices, e.g. mechanical involving magnetic transmission devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/06—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with tangential admission
- G01F1/07—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with tangential admission with mechanical coupling to the indicating device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/10—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with axial admission
- G01F1/11—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with axial admission with mechanical coupling to the indicating device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
- G01F15/065—Indicating or recording devices with transmission devices, e.g. mechanical
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
Definitions
- This document relates to meter devices, such as a flow meter used to indicate fluid flow through a conduit.
- Meter devices can be used to measure the amount of fluid flow through a conduit, such as residential, commercial or industrial gas loads that are delivered through a system of gas lines. For example, some meter devices are used in natural gas flow systems to measure the amount of natural gas transmitted from a producer, transmitted from a distributor, or transmitted to a user. Such meter measurements can be tabulated for purposes of billing consumers of the natural gas.
- one or more instruments can be mounted to a meter device to display, store, or transmit information related to the meter device.
- some gas meters may include remote reader instruments that can transmit data regarding the gas flow (measured values or corrected values) to a service provider.
- Such remote reader instruments may tabulate the accumulation of electrical pulses produced by the instrument and then correlate the electrical pulses to a volume of fluid that passes through the meter device.
- a rotary positive displacement gas meter may employ impellers that rotate in response to gas being directed from a conduit to the meter to act upon the impellers.
- the rotation of the impellers can be translated to rotation of a drive shaft, which is used to drive the instruments. If, however, the meter is connected to the conduit so that fluid flows through the meter in an opposite direction, the rotation of the impellers (and the rotation of the drive shaft) may be reversed. Because the instruments mounted to the flow meter are driven by the drive shaft, the reverse rotation of the drive shaft may affect the operation of the instruments.
- a typical corrector instrument that includes a counter may count upward when the fluid flows through the meter in a particular direction, but may count in reverse if the meter is connected to the conduit so that fluid flows therethrough in the opposite direction.
- a field technician may be required to partially disassemble the instrument and manually adjust one or more gears inside the instrument's drive train before installing the instrument to the meter device.
- Such a manual adjustment of the gears inside the instrument can be time consuming and complex, especially when the instrument is being installed in harsh ambient conditions (e.g., cold outdoor conditions, hot ambient temperatures near a burner, or the like).
- a technician may remove the meter itself from its conduit, physically turn the meter around, and then reinstall the meter to thereby reverse the input and output ends to reverse the rotation of the drive shaft.
- a technician may reconfigure the conduit to reverse the follow through the meter and thereby reverse the rotation of the drive shaft.
- Such manual reconfigurations of the conduit or the meter can be time consuming and complex and may even require pressure testing of connections.
- an improved instrument for a flow meter can automatically adjust in response to the rotational direction of an input shaft, thereby permitting the instrument device to perform its intended function regardless of the fluid flow direction through the flow meter.
- the instrument can be installed to the flow meter without the need to partially disassemble the instrument and manually adjust one or more gears inside the instrument's drive train.
- the instrument may comprise a corrector instrument that includes a counter device.
- the corrector instrument may have self-adjusting gear system that automatically shifts in response to the rotational direction of a drive shaft, and thus the counter device can count in positive increments regardless of the fluid flow direction through the flow meter.
- an instrument for a flow meter may include an input shaft that is driven to rotate in a first direction or in a second opposite direction by a flow meter when the input shaft is coupled to the flow meter.
- the instrument may also include an output shaft that rotates in response to rotation of the input shaft, the rotation of the output shaft causing a data device to collect information related to the flow meter.
- the instrument may further include a gear system that couples the input shaft to the output shaft. The gear system may automatically adjust and thereby direct the output shaft in a forward rotational direction in response to both rotation of the input shaft in the first direction and rotation of the input shaft in the second opposite direction.
- Some embodiments include a method for mounting an instrument to a flow meter.
- the method may include identifying a flow meter installed in a fluid flow system such that fluid passes through the flow meter in a first flow direction or a second opposite flow direction.
- the method may also include mounting an instrument to the flow meter without manually adjusting an internal gear of the instrument to account for the flow direction through the flow meter.
- the instrument may include a counter device that provides information related to the fluid flow through the flow meter. The instrument can automatically adjust so that the counter device counts in positive increments independent of whether fluid passes through the flow meter in the first flow direction or in the second opposite flow direction.
- a corrector instrument for a flow meter may include an input shaft that is driven to rotate in a first direction or in a second opposite direction by an instrument drive device of a flow meter when the input shaft is coupled to the instrument drive device.
- the corrector instrument may also include an output shaft that rotates in response to rotation of the input shaft. The rotation of the output shaft may cause a magnet coupled to the output shaft to rotate.
- the instrument may further include an electronic data device arranged proximate to the magnet to detect the rotation of the magnet and generate information related to an amount of fluid flow through the flow meter.
- the instrument may also include a gear system that couples the input shaft to the output shaft. The gear system may automatically adjust and thereby direct the output shaft in a forward rotational direction in response to both rotation of the input shaft in the first direction and rotation of the input shaft in the second opposite direction.
- an instrument drive device for a flow meter may include an input shaft that is driven to rotate in a first direction or in a second opposite direction by a flow meter when the input shaft is coupled to the flow meter.
- the instrument drive device may also include a drive shaft that rotates in response to rotation of the input shaft.
- the drive shaft may be arranged to drive an instrument when the instrument is coupled to the drive shaft.
- the instrument drive device may further include a gear system that couples the input shaft to the output shaft. The gear system may automatically adjust and thereby direct the drive shaft in a forward rotational direction in response to both rotation of the input shaft in the first direction and rotation of the input shaft in the second opposite direction.
- an index instrument for a flow meter may include a mechanical counter device that provides information related to the fluid flow through a flow meter.
- the index instrument may also include an input shaft that is driven to rotate in a first direction or in a second opposite direction by a flow meter when the input shaft is coupled to the flow meter.
- the index instrument may also include an output shaft that rotates in response to rotation of the input shaft. The rotation of the output shaft can cause a mechanical counter device to operate.
- the index instrument may further include a gear system that couples the input shaft to the output shaft. The gear system can automatically adjust so that the mechanical counter device counts in positive increments in response to both rotation of the input shaft in the first direction and rotation of the input shaft in the second opposite direction.
- an instrument for a flow meter can include a self-adjusting gear system that automatically shifts position in response to the input shaft rotating in one of the first direction and the second, opposite direction. In such circumstances, the instrument can automatically adjust and readily provide a proper output regardless of the fluid flow direction through the flow meter.
- the instrument can be installed by a field technician without the need to partially disassemble the instrument and manually adjust internal gears. As such, the field technician is not required to consider the positive direction of the fluid flow (or the flow meter's drive shaft) and thereafter manually adjust the instrument's internal gears in accordance with the positive direction.
- the field technician can readily mount the instrument to the flow meter, and the instrument will automatically adjust to account for the positive direction of the fluid flow.
- the instrument can include a counter device that counts in positive increments independent of whether fluid passes through the flow meter in a first flow direction or in a second opposite flow direction. Accordingly, the counter device does not necessarily count in reverse if the instrument is connected to the flow meter without accounting for the positive flow direction therethrough.
- FIGS. 1A-B are views of a flow meter in a fluid flow system, in accordance with some embodiments.
- FIG. 2 is a perspective exploded view of an instrument and the flow meter shown in FIGS. 1A-B .
- FIG. 3 is a perspective view of a counter device on the instrument of FIG. 2 .
- FIG. 4 is a perspective exploded view of the counter device of FIG. 3 .
- FIG. 5 is another perspective exploded view of the counter device of FIG. 3 .
- FIG. 6 is a perspective view of a gear system of the instrument of FIG. 2 , in accordance with some embodiments.
- FIG. 7 is a perspective exploded view of the gear system of FIG. 6 .
- FIG. 8 is a perspective view of a component of the gear system of FIG. 6 .
- FIG. 9 is another perspective view of the component of the gear system of FIG. 6 .
- FIG. 10A is a top view of the gear system of FIG. 6 in a first position.
- FIG. 10B is a top view of the gear system of FIG. 6 adjusted to a second position.
- FIGS. 11A-B are views of a flow meter in a fluid flow system, in accordance with some embodiments.
- FIG. 12 is a perspective view of an index instrument shown in FIGS. 11A-B .
- FIG. 13 is another perspective view of the index instrument of in FIG. 12 .
- FIGS. 14A-B are views of a flow meter in a fluid flow system, in accordance with some embodiments.
- a fluid flow system 10 may include one or more conduits 20 , 22 , and 24 that direct fluid through a flow meter 100 .
- the fluid can include a gas, a liquid, or a particulate slurry, or any combination thereof
- the fluid flow system 10 can include control valves 30 and 32 that are opened to permit the fluid flow through the flow meter 100 .
- the flow system 10 may include a bypass valve 34 that can be opened to permit the fluid to bypass the flow meter 100 and conduit 22 .
- the flow meter 100 may be incorporated into the fluid flow system 10 to provide information related to the fluid flow in the system 10 (e.g., to measure a volume of the fluid passing through the flow meter 100 ).
- the flow meter 100 can be used in a natural gas flow system to measure the amount of natural gas transmitted through the conduit 22 and to a user. Such measurements by the flow meter 100 can be collected for purposes of billing the user of the natural gas.
- One or more instruments can be coupled to the flow meter 100 to provide information related to the fluid flow through the flow meter 100 .
- examples of such instruments include an index instrument 110 , an instrument drive device 130 , and a corrector instrument 150 .
- Each of these instruments can be operated by the energy generated from the fluid that flows through the flow meter 100 .
- the flow meter 100 may comprise a rotary positive displacement gas meter that includes impellers (not shown in FIGS. 1A-B ) to rotate when the fluid passes through the flow meter 100 and act upon the impellers. The rotation of the impellers can be translated to rotation of a shaft, which is used to drive the one or more instruments coupled to the flow meter 100 .
- the index instrument 110 may be assembled to the flow meter 100 so that a mechanical counter device indicates the amount of fluid flow through the flow meter 100 (refer also to FIG. 2 ).
- the index instrument 110 may include a gear assembly that causes the mechanical counter device to incrementally adjust in response to rotation of the impellers inside the flow meter 100 .
- the instrument drive device 130 can be mounted to the flow meter 100 (either directly or indirectly via the index instrument 110 ) to translate rotational motion from the impellers to a drive shaft 135 , which can be used to operate a number of accessory instruments such as the corrector instrument 150 (described in more detail below).
- At least one of the instruments 110 , 130 , and 150 includes an improved feature in which the instrument can be self-adjusting so that the instrument performs its output function independent of whether fluid passes through the flow meter 100 in a first flow direction ( FIG. 1A ) or in the second, opposite flow direction ( FIG. 1B ).
- the instrument 150 mounted to the instrument drive 130 is configured to provide such an automatic adjustment.
- the instrument 150 can include a self-adjusting gear system 180 (described in more detail below in connection with FIGS. 10A-B ) that automatically shifts position to provide a positive output independent of whether the drive shaft 135 rotates in a first direction ( FIG. 1A ) or a second, opposite direction ( FIG. 1B ).
- the instrument 150 is a corrector instrument that includes a mechanical counter device 160 and an electronic counter device 170 . Because the corrector instrument 150 includes the self-adjusting gear system 180 , the corrector instrument 150 is capable of performing its output function by counting upward in positive increments regardless of the positive rotational direction of the drive shaft 135 on the instrument drive device 130 (e.g., independent of whether the drive shaft 135 rotates in a first direction ( FIG. 1A ) or a second, opposite direction ( FIG. 1B )).
- the corrector instrument 150 is to be installed while the flow meter 100 is in the field of operation (e.g., already mounted into the flow system 10 ), the instrument 150 can be readily installed to the flow meter 100 without the need to partially disassemble the instrument and manually adjust internal gears.
- the field technician is not required to consider the positive direction of the fluid flow and thereafter manually adjust the instrument's internal gears in accordance with the positive rotational direction of the drive shaft 135 .
- the field technician can readily mount the instrument 150 to the instrument drive 130 , and the instrument 150 will self-adjust its internal gear system 180 to account for the positive direction of the fluid flow (and the positive rotational direction of the drive shaft 135 ).
- FIGS. 1A-B illustrate an example of this functionality.
- the flow system 10 may be configured so that the fluid passes through the flow meter 100 in a first direction and then through the conduit 22 .
- the fluid enters the flow meter 100 through a first port 105 and then exits the flow meter 100 through a second port 106 .
- the fluid acts upon the impellers (not shown in FIG. 1A ) of the flow meter 100 to drive the rotation of the impellers.
- This rotational motion of the impellers can be translated to the index instrument 110 and the instrument drive device 130 via a number of shafts and gears.
- the positive flow through the flow meter 100 in the first direction FIG.
- the corrector instrument 150 causes the drive shaft 135 of the instrument drive device 130 to have a positive rotation in a first direction.
- the corrector instrument 150 can be mounted to the instrument drive device 130 so that the drive shaft 135 is coupled to the self-adjusting gear system 180 of the instrument 150 .
- the corrector instrument 150 is capable of performing its output function by counting upward in positive increments independent of the positive rotational direction of the drive shaft 135 on the instrument drive device 130 .
- the corrector instrument 150 can be mounted to the instrument drive device 130 without the need to partially disassemble the instrument 150 and manually adjust internal gears.
- the flow system 10 alternatively may be configured so that the fluid passes through the flow meter 100 in a second direction and then through the conduit 22 .
- fluid enters the flow meter 100 through the second port 106 and exits the flow meter 100 through the first port 105 .
- the fluid acts upon the impellers (not shown in FIG. 1B ) of the flow meter 100 to drive the impellers in a direction opposite that described in connection with FIG. 1A .
- this rotational motion of the impellers can be translated to the index instrument 110 and the instrument drive device 130 via a number of shafts and gears.
- the positive flow through the flow meter 100 in the second direction causes the drive shaft 135 of the instrument drive device 130 to have a positive rotation in a second direction.
- the corrector instrument 150 can nevertheless be mounted to the instrument drive device 130 without the need to partially disassemble the instrument 150 and manually adjust internal gears. Due to the operation of the gear system 180 (described below, for example, in connection with FIGS. 10A-B ), the corrector instrument 150 is capable of automatically adjusting to count upward in positive increments regardless of the positive rotational direction of the drive shaft 135 on the instrument drive device 130 .
- the self-adjusting gear system 180 may be implemented in other instruments for the flow meter 100 .
- the self-adjusting gear system 180 may be arranged in the index instrument 110 so that the index instrument counts in positive increments regardless of whether the fluid flow through the meter 100 is in the first direction ( FIG. 11A ) or the second direction ( FIG. 11B ).
- the index instrument counts in positive increments regardless of whether the fluid flow through the meter 100 is in the first direction ( FIG. 11A ) or the second direction ( FIG. 11B ).
- FIGS. 11A first direction
- FIG. 11B the second direction
- the self-adjusting gear system 180 may be arranged in the instrument drive device 130 so that the drive shaft 135 rotates in one direction independent of whether the positive fluid flow through the meter is in the first direction ( FIG. 14A ) or the second direction ( FIG. 14B ).
- the index instrument 110 can be mounted to the flow meter 100 so that the rotation of the flow meter's impellers (not shown in FIG. 2 ) drives the operation of these instruments.
- the index instrument 110 is directly mounted to the flow meter 100 using a number of bolts. When the fluid flows into one of the ports 105 or 106 of the flow meter, the impellers rotate and cause a mechanical counter device 114 in the index instrument 110 to operate.
- the mechanical counter device 114 may comprise an indicator (e.g., having an appearance similar to a vehicle odometer) that displays information related to the fluid flow through the flow meter 100 , such as a volume of fluid passing through the flow meter 100 .
- the information provided by the mechanical counter device 114 of the index instrument device 110 may comprise raw data that is not necessarily corrected for temperature or pressure variations in the fluid flow.
- the index instrument 110 may include a window panel 112 so that a user located at the flow meter 100 can view the information provided by the index instrument 110 .
- the instrument drive device 130 can be indirectly mounted to the flow meter 100 via the index instrument 110 . Accordingly, when the fluid flows into one of the ports 105 or 106 of the flow meter 100 , the rotation of the impellers is translated (via a number of shafts and gears disposed in the index instrument 110 and in the instrument drive device 130 ) to the drive shaft 135 . As such, in this embodiment, the positive direction of fluid flow through the flow meter 100 dictates the positive direction of rotation for the drive shaft (refer, for example, to FIGS. 1A-B ).
- the drive shaft 135 may extend from a mounting platform 132 of the instrument drive device 130 so that an accessory instrument (e.g., a corrector instrument, a chart recorder, or the like) can connect with the mounting platform 132 and engage the drive shaft 135 .
- an accessory instrument e.g., a corrector instrument, a chart recorder, or the like
- the corrector instrument 150 is indirectly mounted to the flow meter 100 via the instrument drive device 130 and engages the drive shaft 135 .
- the corrector instrument 150 may include a first assembly 152 that is mountable to the instrument drive device 130 and a second assembly 170 that is connected to the first assembly 152 .
- the first assembly 152 can house the self-adjusting gear system 180 (refer to FIGS. 5-7 ), which couples with the drive shaft 135 when the corrector instrument 150 is mounted to the instrument drive device 130 .
- the first assembly 152 may house a mechanical counter device 160 that is viewable through a window panel 155 of the first assembly 152 .
- the mechanical counter device 160 may comprise an indicator (e.g., having an appearance similar to a vehicle odometer) that displays information related to the fluid flow through the flow meter 100 .
- the mechanical counter device 160 may comprise an eight-digit indicator displaying a value for a volume of fluid that passes through the flow meter 100 .
- At least a portion of the window panel 155 is transparent so that the indicator is viewable to a user located at the flow meter 100 .
- the second assembly 170 may be in the form of an electronic counter device that generates electronic data related to the fluid flow through the flow meter 100 .
- the electronic counter device 170 may house a pulser circuit that senses the rotation of a shaft-mounted magnet 189 ( FIGS. 5-6 ) arranged in the first assembly 152 .
- the electronic counter device 170 can correlate the detected magnet rotations with the fluid flow through the flow meter 100 .
- the electronic counter device 170 can correct these values to account for variations in temperature, pressure, or both.
- the electronic counter device 170 may include a user interface 172 (e.g., an electronic display device, one or more buttons, one or more dials, or the like) and at least one communication output 174 .
- the communication output 174 can be used, for example, to communicate one or more signals to a remote site via a hardwire connection, a fiber optic cable connection, a wireless communication connection (e.g., RF communication, infrared communication, cellular communication, satellite communication), or the like.
- the information gathered by the electronic counter device 170 can be communicated to the remote site (e.g., a central service station) for the purpose of periodically monitoring the fluid flow through the flow meter 100 .
- the data signals from the electronic counter device 170 can indicate a corrected fluid volume, an uncorrected fluid volume, and an alarm condition. These signals can be communicated to the remote site for purposes of monitoring the fluid flow, billing the consumer of fluid, or a combination thereof.
- the corrector instrument 150 may operate when the drive shaft 135 of the instrument drive device 130 rotates, thereby causing the self-adjusting gear system 180 (described, for example, in connection with FIGS. 6-10B ) to urge both the mechanical counter device 160 and the electronic counter device 170 to operate. Accordingly, in some circumstances, the accuracy of the information communicated by the electronic counter device 170 can be verified by viewing the mechanical counter device 160 arranged in the corrector instrument 150 . As previously described, the mechanical counter device 160 and the electronic counter device 170 of the corrector instrument 150 count upward in positive increments independent of whether the drive shaft 135 rotates in a first direction ( FIG. 1A ) or a second, opposite direction ( FIG. 1B ).
- the mechanical counter device 160 , the electronic counter device 170 , or both may indicate corrected values that account for variations in temperature, pressure, or both. If, for example, the mechanical counter device 160 indicates the uncorrected fluid volume, the accuracy of the electronic counter device 170 can be periodically evaluated by comparing the readings of the mechanical counter device 160 to the uncorrected fluid volume data transmitted by the electronic counter device 170 .
- the mechanical counter device 160 of the corrector instrument 150 may be driven by the self-adjusting gear system 180 , which is capable of outputting positive rotation in a forward rotational direction in response to rotation from the drive shaft 135 ( FIG. 2 ).
- the mechanical counter device 160 has housing components 161 and 162 to contain an indicator mechanism 163 that incrementally adjusts in response to the output rotation of the gear system 180 .
- the indicator mechanism 163 may comprise an eight-digit indicator (e.g., having an appearance similar to a vehicle odometer) that is used to indicate a volume of fluid that passes through the flow meter 100 ( FIG. 2 ). Because the self-adjusting gear system 180 does not output rotation in a reverse direction (opposite the forward direction), the indicator mechanism 163 is not urged to count downward in negative increments.
- the gear system 180 includes an input shaft 181 that engages the drive shaft 135 ( FIG. 2 ) of the instrument drive device 130 such that the input shaft 181 rotates in response to rotation of the drive shaft 135 .
- the input shaft 181 may indirectly engage the drive shaft 135 via a drive dog connection (not shown in FIGS. 3-5 ).
- the input shaft 181 is coupled to an input gear 182 ( FIG. 5 ), which drives an output gear 184 via an idler gear assembly 185 ( FIG. 5 ).
- the idler gear assembly 185 is capable of automatically adjusting positions so that the output gear 184 rotates in the forward rotational direction independent of the rotational direction of the input gear 182 .
- an output shaft 186 that is coupled to the output gear 184 also rotates in the forward rotational direction both when the input shaft 181 rotates in a first direction and when the input shaft 181 rotates in a second opposite direction.
- a bevel gear 188 and a magnet 189 are arranged on the output shaft 186 of the gear system 180 .
- the bevel gear 188 is used to drive the rotation of the gear train 164 for the indicator mechanism 163 .
- the gear train 164 may provide a rotational translation between the gear system 180 and the indicator mechanism 163 so that one rotation by the input shaft (or the drive shaft 135 ( FIG. 2 )) correlates to a particular volume of fluid that is incrementally counted by the indicator mechanism 163 .
- the magnet 189 is rotated by the output shaft, and as previously described, the magnet rotations can be sensed by the electronic counter device 170 ( FIG. 2 ) to indicate a volume of fluid that passes through the flow meter 100 .
- the self-adjusting gear system 180 drives the output shaft to always rotate in the forward rotational direction (independent of the rotational direction of the input shaft 181 ), the bevel gear 188 and the magnet 189 likewise rotate in the forward rotational direction.
- Such a configuration causes the indicator mechanism 163 and the electronic counter device 170 ( FIG. 2 ) to count upwardly in positive increments independent of whether the drive shaft 135 rotates in a first direction ( FIG. 1A ) or a second, opposite direction ( FIG. 1B ).
- a field technician is not required to consider the positive direction of the fluid flow through the meter 100 ( FIG. 2 ) and thereafter manually adjust internal components of the instrument 150 ( FIG. 2 ) in accordance with the positive rotational direction of the drive shaft 135 .
- the field technician can readily mount the instrument 150 to the instrument drive 130 so that the drive shaft 135 couples with the gear system 180 , and the gear system 180 will automatically adjust to account for the positive direction of the fluid flow (and the corresponding rotational direction of the drive shaft 135 ).
- some embodiments of the instrument 150 may have a construction that reduces the likelihood of tampering.
- some instruments may include a panel that is readily removable to access internal gears for manual adjustment by a field technician. With these instruments, an individual may attempt to remove the panel and tamper with the internal components so that the instrument does not accurately measure the fluid flow through the flow meter 100 (e.g., undercount the fluid flow to cause inaccurately lower bills).
- such attempts to tamper with the internal components may be hindered because no such access panel is available to the tampering individual. As shown in FIG.
- the first assembly 152 of the instrument 150 houses the mechanical counter 160 , which is accessible only after removing the front window 155 .
- the gear system 180 is further protected from tampering because it is contained within the housing components 161 and 162 of the mechanical counter device 160 .
- the self-adjusting gear system 180 can automatically adjust to account for the positive flow direction through the flow meter 100 , no access panel is required (in this embodiment) for manual adjustment by a field technician.
- no access panel is available for an individual to readily remove and tamper with the internal components of the instrument 150 .
- the self-adjusting gear system 180 include an idler gear assembly 185 that can automatically adjust positions in response to the rotational direction of the input shaft 181 .
- the gear system 180 has a construction such that the gear system 180 as a whole can be readily assembled into (or removed from) the housing components 161 and 162 of the mechanical counter device 160 ( FIG. 4 ).
- the input gear 182 , the output gear 184 , and the idler gear assembly 185 may be retained generally in a plane with one another between two mounting plates that are bolted together.
- the input shaft 181 can be coupled to the input gear 182 so that a portion of the input shaft 181 extends downwardly from the mounting plates toward the drive shaft 135 ( FIG.
- the output shaft 186 can be coupled to the output gear 184 so that the output shaft 186 extends upwardly from the mounting plates toward the gear train 164 ( FIG. 5 ) of the mechanical counter device 160 .
- the bevel gear 188 and the magnet 189 are received on the output shaft 186 to rotate with the output shaft.
- the idler gear assembly 185 may be movable relative to the input gear 182 and the output gear 184 .
- the idler gear assembly 185 can pivot about an axis 195 relative to the input gear 182 and the output gear 186 .
- the idler gear assembly 185 may include a movable body 190 that retains idler gears 192 and 194 (refer also to FIG. 9 ).
- the movable body 190 includes a guide pin 193 that is movable within a guide slot 183 of the gear system mounting plate.
- the movable body 190 includes a pivot pin 196 that pivots about the axis 195 when the guide pin 193 moves within the guide slot 183 .
- Such a pivoting motion of the idler gear assembly 185 may occur automatically in response to the rotational direction of the input shaft 181 and the input gear 182 .
- the self-adjusting gear system 180 may not require manual adjustment by a field technician at the time of instrument installation.
- such a pivoting motion of the idler gear assembly 185 can cause at least one of the idler gears (e.g., idler gear 194 ) to become engaged or disengaged with the output gear 184 .
- the idler gear assembly 185 retains two or more gears 192 and 194 in a rotational relationship.
- the idler gear 192 is rotatable about its central longitudinal axis relative to the movable body 190
- the second idler gear 194 is rotatable about its central longitudinal axis relative to the movable body 190 .
- one or both of the idler gears 192 and 194 can rotate with the input and output gears 182 and 184 ( FIGS. 6-7 ) while the movable body 190 is in a first position (refer to FIG. 10A ) or a second position (refer to FIG. 10B ).
- the guide pin 193 and the pivot pin 196 can be integrally formed with the movable body 190 , for example, during a polymer molding process. Thereafter, the first and second idler gears 192 and 194 can be assembled with the movable body 190 so that the idler gears 192 and 194 are rotatable relative to the movable body 190 .
- the pivot pin 196 is arranged between the central axis of the first idler gear 192 and the central axis of the second idler gear 194 .
- the idler gears 192 and 194 adjust positions relative to the input and output gears 182 and 184 ( FIGS. 6-7 ) when the movable body 190 pivots about the pivot axis 195 of the pivot pin 196 .
- the self-adjusting gear system 180 is configured to automatically shift position in response to the input shaft 181 rotating in one of a first direction and a second, opposite direction.
- the instrument 150 in which the gear system 180 is incorporated can automatically adjust and readily provide a positive output regardless of the fluid flow direction through the flow meter ( FIG. 2 ).
- the instrument 150 can include the mechanical counter device 160 ( FIG. 2 ) and the electronic counter device 170 ( FIG. 2 ) that count an amount of fluid flow in positive increments when the output shaft 186 of the gear system 180 is rotated in a forward rotational direction 197 .
- forward rotation of the output shaft 186 can drive the positive counting operations by the mechanical counter device 160 ( FIG.
- the idler gear assembly 185 is adjustable relative to the input gear 182 and the output gear 184 so as to cause the output gear 184 to rotate in the forward rotational direction 197 regardless of whether the input gear 182 rotates in a first direction 198 a ( FIG. 10A ) or in a second, opposite direction 198 b ( FIG. 10B ).
- the output shaft 186 can rotate the bevel gear 188 (to drive the mechanical counter device 160 ( FIGS. 4-5 )) and the magnet 189 (to drive the electronic counter device 170 ( FIG. 2 )) in the forward rotational direction 197 both when the input shaft 181 is driven in the first direction 198 a ( FIG. 10A ) and when the input shaft 181 is driven in the second direction 198 b ( FIG. 10B ).
- the input shaft 181 of the gear system 180 may be driven in the first rotational direction 198 a by the drive shaft 135 of the instrument drive device 130 (as described in connection with FIG. 1A ).
- the input shaft 181 is directly coupled to the input gear 182 , so the input gear 182 also rotates in the first rotational direction 198 a .
- the idler gear assembly 185 is urged toward to a first orientation so that the output gear rotates in the forward rotational direction 197 .
- the movable body 190 of the idler gear assembly 185 is positioned so that the guide pin 193 is in a first condition within the guide slot 183 .
- the movable body 190 will automatically pivot to this condition (e.g., pivot about pivot pin 196 ) when the input gear 182 begins to rotate in the first rotational direction 198 a .
- the idler gear assembly 185 is urged to this first orientation in response to the rotation of the input gear in the first direction 198 a because the teeth of the input gear 182 act upon the teeth of the first idler gear 192 , thereby causing a torque about the pivot pin 196 .
- Such a torque abut the pivot pin 196 can urge the guide pin 193 toward the condition depicted in FIG. 10A .
- the first idler gear 192 engages both the input gear 182 and the output gear 184 while the second idler gear 194 is separated from the input gear 182 and the output gear 184 . Accordingly, the input gear 182 is driven in the first rotational direction 198 a , and the first idler gear 192 translates this motion to the output gear 184 so that the output gear 184 (and the output shaft 186 coupled thereto) rotates in the forward rotational direction 197 .
- the self-adjusting gear system 180 can automatically adjust to so that the output gear 184 (and the output shaft 186 coupled thereto) rotates in the forward rotational direction 197 .
- the input shaft 181 in this embodiment is directly coupled to the input gear 182 , so the input gear 182 also rotates in the second rotational direction 198 b .
- the idler gear assembly 185 is urged toward a second orientation in which the movable body 190 is positioned so that the guide pin 193 is in a second condition within the guide slot 183 .
- the guide pin 193 may move a displacement distance 199 within the guide slot 183 (e.g., the movable body 190 pivots about the pivot pin 196 ) when the input gear 182 begins to rotate in the second rotational direction 198 b .
- the idler gear assembly 185 is urged to this second orientation in response to the rotation of the input gear 182 in the second direction 198 b because the teeth of the input gear 182 act upon the teeth of the first idler gear 192 , thereby causing a torque about the pivot pin 196 .
- Such a torque abut the pivot pin 196 can urge the guide pin 193 to move the displacement distance 199 toward the condition depicted in FIG. 10B .
- the first idler gear 192 directly engages the input gear 182 while the second idler gear 194 directly engages the output gear 184 .
- the input gear 182 is driven in the second rotational direction 198 b , and the first idler gear 192 translates this motion to the second idler gear 194 .
- the second idler gear 194 acts upon the output gear 184 so that the output gear 184 (and the output shaft 186 coupled thereto) rotates in the forward rotational direction 197 .
- the instrument 150 in which the gear system 180 resides can be self-adjusting so that the instrument 150 performs its output function independent of whether fluid passes through the flow meter 100 in a first flow direction ( FIG. 1A ) or in the second, opposite flow direction ( FIG. 1B ).
- the corrector instrument 150 is mounted to the instrument drive device 130 and is capable of automatically adjusting to provide a positive output independent of whether the drive shaft 135 rotates in a first direction or a second, opposite direction (refer, for example, to FIGS. 1A-B ). Because the corrector instrument 150 includes the self-adjusting gear system 180 , the corrector instrument 150 is capable of performing its output function by counting upward in positive increments independent of the positive rotational direction of the drive shaft 135 on the instrument drive device 130 .
- the corrector instrument 150 is to be installed while the flow meter 100 is in the field of operation (e.g., already mounted into the flow system 10 as shown in FIG. 1A or FIG. 1B ).
- the instrument 150 can be installed to the flow meter 100 without the need to partially disassemble the instrument 150 and manually adjust internal gears.
- the field technician is not required to consider the positive direction of the fluid flow and thereafter manually adjust the instrument's internal gears in accordance with the positive rotational direction of the drive shaft 135 . Rather, the field technician can readily mount the instrument 150 to the instrument drive 130 , and the self-adjusting gear system 180 of the instrument will act accordingly to account for the positive direction of the fluid flow (and the positive rotational direction of the drive shaft 135 ).
- the self-adjusting gear system may be used in instruments other than the corrector instrument.
- the self-adjusting gear system 180 may be arranged in the index instrument 110 , the instrument drive device 130 , or in other accessory instruments that mount to the instrument drive device 130 (e.g., a chart recorder instrument or the like).
- the self-adjusting gear system 180 may be arranged in an index instrument 210 so that a counter device 214 of the index instrument 210 counts in positive increments regardless of whether the positive fluid flow through the meter 100 is in the first direction ( FIG. 11A ) or the second direction ( FIG. 11B ). Similar to the index instrument 110 previously described in connection with FIG. 2 , the index instrument 210 may be assembled to the flow meter 100 so that the counter device 214 ( FIGS. 12-13 ) indicates the amount of fluid flow through the flow meter 100 .
- the index instrument 210 may include a gear train that causes the counter device 214 to incrementally adjust in response to rotation of the impellers inside the flow meter 100 . As described below, the self-adjusting gear system 180 may be incorporated into the gear train of the index instrument 210 .
- the index instrument 210 is directly mounted to the flow meter 100 using a number of bolts.
- the impellers rotate and cause a connector shaft 215 ( FIGS. 12-13 ) to rotate, which drives the counter device 214 to operate (e.g., via the gear train).
- the counter device 214 may be a mechanical counter device including an indicator (e.g., having an appearance similar to a vehicle odometer) that displays information related to the fluid flow through the flow meter 100 , such as a volume of fluid passing through the flow meter 100 .
- the index instrument 210 may include a window panel 212 so that a user located at the flow meter 100 can view the information provided by the index instrument 210 .
- the self-adjusting gear system 180 may be incorporated into the index instrument 210 so that the index instrument 210 can self-adjust to perform its output function independent of whether fluid passes through the flow meter 100 in a first flow direction ( FIG. 11A ) or in the second opposite flow direction ( FIG. 11B ). As previously described in connection with FIGS. 10A-B , the self-adjusting gear system 180 can automatically shift positions to provide a positive output independent of whether the connector shaft 215 (e.g., coupled to the flow meter impellers) rotates in a first direction ( FIG. 11A ) or a second, opposite direction ( FIG. 11B ). Because the index instrument 210 includes the self-adjusting gear system 180 , the index instrument 210 is capable of performing its output function by counting upward in positive increments regardless of the positive rotational direction of the connector shaft 215 ( FIGS. 12-13 )).
- the connector shaft 215 e.g., coupled to the flow meter impellers
- the instrument drive device 130 is coupled to the flow meter 100 via the index instrument 210 .
- the rotation of the drive shaft 135 of the instrument drive device 130 is directed by the output rotation from the index instrument 210 .
- the index instrument 210 includes the self-adjusting gear system 180 , the output rotation of the index instrument 210 is in one rotational direction independent of whether fluid passes through the flow meter 100 in a first flow direction ( FIG. 11A ) or in the second opposite flow direction ( FIG. 11B ).
- the drive shaft 135 rotates in one direction independent of whether the positive fluid flow through the meter is in the first direction ( FIG. 11A ) or the second direction ( FIG. 11B ).
- an accessory instrument 250 is to be installed while the flow meter 100 is in the field of operation (e.g., already mounted into the flow system 10 )
- the instrument 250 can be installed to the instrument drive device 130 without the need to partially disassemble the instrument 250 and manually adjust internal gears.
- the field technician is not required to consider the positive direction of the fluid flow and thereafter manually adjust the instrument's internal gears in accordance with the positive rotational direction of the drive shaft 135 .
- the field technician can readily mount the instrument 250 to the instrument drive 130 because the drive shaft 135 rotates in one direction independent of whether the positive fluid flow through the meter is in the first direction ( FIG. 11A ) or the second direction ( FIG. 11B ).
- the accessory instrument 250 can be designed according to the one rotational direction of the drive shaft 135 .
- the connector shaft 215 of the index instrument 210 is attachable to the flow meter 100 so that the connector shaft 215 rotates in response to the rotation of the flow meter impellers (not shown in FIGS. 12-13 ).
- the connector shaft 215 may engage the self-adjusting gear system 180 incorporated in the index instrument 210 .
- the connector shaft 215 serves as an input shaft to the gear system 180 by engaging the input gear 182 via an intermediate gear (refer to FIG. 13 ).
- the connector shaft 215 may be directly coupled to the input gear 182 (e.g., acting as a direct input shaft for the gear system 180 ).
- the self-adjusting gear system 180 is configured to provide forward rotation to the output shaft 186 , which drives the gear train 216 of the index instrument 210 in a positive direction to act upon the counter device 214 .
- the counter device 214 is capable of counting in positive increments in response to both rotation of the connector shaft 215 in a first direction and rotation of the connector shaft 215 in a second opposite direction.
- the gear system 180 includes the input gear 182 , the output gear 184 (not shown in FIG. 13 ; refer to FIGS.
- the idler gear assembly 185 that pivots between a first orientation and a second orientation depending on the rotational direction of the input gear 182 .
- the guide pin 193 may be in one condition in the guide slot 183 when the idler gear assembly 185 is in the first orientation, and the guide pin 193 may be in a different condition within the guide slot 183 when the idler gear assembly 185 is in the second orientation.
- Such automatic adjustment by the idler gear assembly maintains the output rotation of the output shaft 186 in the forward rotational direction.
- the index instrument 210 can self-adjust to perform its output function independent of whether the connector shaft 215 is driven by the flow meter in a first direction or in a second opposite direction (e.g., independent of whether fluid passes through the flow meter 100 in a first flow direction ( FIG. 11A ) or in the second opposite flow direction ( FIG. 11B ).
- the self-adjusting gear system 180 may be incorporated into an instrument drive device 230 so that a drive shaft 235 rotates in one direction independent of whether the positive fluid flow through the meter is in the first direction ( FIG. 14A ) or the second direction ( FIG. 14B ).
- the instrument drive device 230 may be assembled to the flow meter 100 so that the drive shaft rotates in response to fluid flow through the flow meter 100 .
- the instrument drive device 230 and the index instrument 110 may include a number of shafts and gears that cause the drive shaft 235 to rotate in response to rotation of the impellers inside the flow meter 100 .
- the self-adjusting gear system 180 may be incorporated into the gear train of the instrument drive device 230 .
- the instrument drive device 230 is indirectly mounted to the flow meter 100 (e.g., via the index instrument 110 ). Because the instrument drive device 230 includes the self-adjusting gear system 180 , the output rotation of the drive shaft 235 is in one direction independent of whether fluid passes through the flow meter 100 in a first flow direction ( FIG. 14A ) or in the second opposite flow direction ( FIG. 14B ). Similar to the operation previously described in connection with FIGS. 10A-B , the gear system 180 includes the idler gear assembly 185 that pivots between a first orientation and a second orientation depending on the rotational direction of the input gear 182 . Such automatic adjustment by the idler gear assembly 185 maintains the output rotation of the gear system 180 in the forward rotational direction. Accordingly, the instrument drive device 230 can self-adjust to perform its output function independent of whether fluid passes through the flow meter 100 in a first flow direction ( FIG. 14A ) or in the second opposite flow direction ( FIG. 14B ).
- the instrument 250 when an accessory instrument 250 is to be installed while the flow meter 100 is in the field of operation (e.g., already mounted into the flow system 10 ), the instrument 250 can be installed to the instrument drive device 230 without the need to partially disassemble the instrument 250 and manually adjust internal gears.
- the field technician is not required to consider the positive direction of the fluid flow and thereafter manually adjust the instrument's internal gears in accordance with the positive rotational direction of the drive shaft 235 .
- the field technician can readily mount the instrument 250 to the instrument drive device 230 because the drive shaft 235 rotates in one direction independent of whether the positive fluid flow through the meter is in the first direction ( FIG. 14A ) or the second direction ( FIG. 14B ).
- the accessory instrument 250 can be designed according to the one rotational direction of the drive shaft 235 .
Abstract
Some embodiments of an instrument for a flow meter can automatically adjust in response to the rotational direction of the drive shaft of the flow meter, thereby permitting the instrument device to perform its intended function regardless of the fluid flow direction through the flow meter. In one example, the instrument may comprise a corrector instrument that includes a counter.
Description
- This application is a division of U.S. application Ser. No. 11/671,846, filed on Feb. 6, 2007 and entitled “Instruments For Flow Meters,” the contents of which are incorporated herein by reference.
- This document relates to meter devices, such as a flow meter used to indicate fluid flow through a conduit.
- Meter devices can be used to measure the amount of fluid flow through a conduit, such as residential, commercial or industrial gas loads that are delivered through a system of gas lines. For example, some meter devices are used in natural gas flow systems to measure the amount of natural gas transmitted from a producer, transmitted from a distributor, or transmitted to a user. Such meter measurements can be tabulated for purposes of billing consumers of the natural gas.
- In some circumstances, one or more instruments can be mounted to a meter device to display, store, or transmit information related to the meter device. For example, some gas meters may include remote reader instruments that can transmit data regarding the gas flow (measured values or corrected values) to a service provider. Such remote reader instruments may tabulate the accumulation of electrical pulses produced by the instrument and then correlate the electrical pulses to a volume of fluid that passes through the meter device.
- Some instruments that are mounted to a meter device are driven by energy generated from the fluid flow through the meter device. For example, a rotary positive displacement gas meter may employ impellers that rotate in response to gas being directed from a conduit to the meter to act upon the impellers. The rotation of the impellers can be translated to rotation of a drive shaft, which is used to drive the instruments. If, however, the meter is connected to the conduit so that fluid flows through the meter in an opposite direction, the rotation of the impellers (and the rotation of the drive shaft) may be reversed. Because the instruments mounted to the flow meter are driven by the drive shaft, the reverse rotation of the drive shaft may affect the operation of the instruments. For example, a typical corrector instrument that includes a counter may count upward when the fluid flows through the meter in a particular direction, but may count in reverse if the meter is connected to the conduit so that fluid flows therethrough in the opposite direction.
- To account for the flow direction through the meter and the resulting rotational direction of the drive shaft, a field technician may be required to partially disassemble the instrument and manually adjust one or more gears inside the instrument's drive train before installing the instrument to the meter device. Such a manual adjustment of the gears inside the instrument can be time consuming and complex, especially when the instrument is being installed in harsh ambient conditions (e.g., cold outdoor conditions, hot ambient temperatures near a burner, or the like).
- Alternatively, a technician may remove the meter itself from its conduit, physically turn the meter around, and then reinstall the meter to thereby reverse the input and output ends to reverse the rotation of the drive shaft. Or, a technician may reconfigure the conduit to reverse the follow through the meter and thereby reverse the rotation of the drive shaft. Such manual reconfigurations of the conduit or the meter can be time consuming and complex and may even require pressure testing of connections.
- Some embodiments an improved instrument for a flow meter can automatically adjust in response to the rotational direction of an input shaft, thereby permitting the instrument device to perform its intended function regardless of the fluid flow direction through the flow meter. In these circumstances, the instrument can be installed to the flow meter without the need to partially disassemble the instrument and manually adjust one or more gears inside the instrument's drive train. In one example, the instrument may comprise a corrector instrument that includes a counter device. The corrector instrument may have self-adjusting gear system that automatically shifts in response to the rotational direction of a drive shaft, and thus the counter device can count in positive increments regardless of the fluid flow direction through the flow meter.
- In particular embodiments, an instrument for a flow meter may include an input shaft that is driven to rotate in a first direction or in a second opposite direction by a flow meter when the input shaft is coupled to the flow meter. The instrument may also include an output shaft that rotates in response to rotation of the input shaft, the rotation of the output shaft causing a data device to collect information related to the flow meter. The instrument may further include a gear system that couples the input shaft to the output shaft. The gear system may automatically adjust and thereby direct the output shaft in a forward rotational direction in response to both rotation of the input shaft in the first direction and rotation of the input shaft in the second opposite direction.
- Some embodiments include a method for mounting an instrument to a flow meter. The method may include identifying a flow meter installed in a fluid flow system such that fluid passes through the flow meter in a first flow direction or a second opposite flow direction. The method may also include mounting an instrument to the flow meter without manually adjusting an internal gear of the instrument to account for the flow direction through the flow meter. The instrument may include a counter device that provides information related to the fluid flow through the flow meter. The instrument can automatically adjust so that the counter device counts in positive increments independent of whether fluid passes through the flow meter in the first flow direction or in the second opposite flow direction.
- In some embodiments, a corrector instrument for a flow meter may include an input shaft that is driven to rotate in a first direction or in a second opposite direction by an instrument drive device of a flow meter when the input shaft is coupled to the instrument drive device. The corrector instrument may also include an output shaft that rotates in response to rotation of the input shaft. The rotation of the output shaft may cause a magnet coupled to the output shaft to rotate. The instrument may further include an electronic data device arranged proximate to the magnet to detect the rotation of the magnet and generate information related to an amount of fluid flow through the flow meter. The instrument may also include a gear system that couples the input shaft to the output shaft. The gear system may automatically adjust and thereby direct the output shaft in a forward rotational direction in response to both rotation of the input shaft in the first direction and rotation of the input shaft in the second opposite direction.
- In certain embodiments, an instrument drive device for a flow meter may include an input shaft that is driven to rotate in a first direction or in a second opposite direction by a flow meter when the input shaft is coupled to the flow meter. The instrument drive device may also include a drive shaft that rotates in response to rotation of the input shaft. The drive shaft may be arranged to drive an instrument when the instrument is coupled to the drive shaft. The instrument drive device may further include a gear system that couples the input shaft to the output shaft. The gear system may automatically adjust and thereby direct the drive shaft in a forward rotational direction in response to both rotation of the input shaft in the first direction and rotation of the input shaft in the second opposite direction.
- In some embodiments, an index instrument for a flow meter may include a mechanical counter device that provides information related to the fluid flow through a flow meter. The index instrument may also include an input shaft that is driven to rotate in a first direction or in a second opposite direction by a flow meter when the input shaft is coupled to the flow meter. The index instrument may also include an output shaft that rotates in response to rotation of the input shaft. The rotation of the output shaft can cause a mechanical counter device to operate. The index instrument may further include a gear system that couples the input shaft to the output shaft. The gear system can automatically adjust so that the mechanical counter device counts in positive increments in response to both rotation of the input shaft in the first direction and rotation of the input shaft in the second opposite direction.
- These and other embodiments may provide one or more of the following advantages. First, an instrument for a flow meter can include a self-adjusting gear system that automatically shifts position in response to the input shaft rotating in one of the first direction and the second, opposite direction. In such circumstances, the instrument can automatically adjust and readily provide a proper output regardless of the fluid flow direction through the flow meter. Second, if the instrument is the type that is installed while the flow meter is in the field of operation, the instrument can be installed by a field technician without the need to partially disassemble the instrument and manually adjust internal gears. As such, the field technician is not required to consider the positive direction of the fluid flow (or the flow meter's drive shaft) and thereafter manually adjust the instrument's internal gears in accordance with the positive direction. Instead, the field technician can readily mount the instrument to the flow meter, and the instrument will automatically adjust to account for the positive direction of the fluid flow. Third, the instrument can include a counter device that counts in positive increments independent of whether fluid passes through the flow meter in a first flow direction or in a second opposite flow direction. Accordingly, the counter device does not necessarily count in reverse if the instrument is connected to the flow meter without accounting for the positive flow direction therethrough.
- The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims.
-
FIGS. 1A-B are views of a flow meter in a fluid flow system, in accordance with some embodiments. -
FIG. 2 is a perspective exploded view of an instrument and the flow meter shown inFIGS. 1A-B . -
FIG. 3 is a perspective view of a counter device on the instrument ofFIG. 2 . -
FIG. 4 is a perspective exploded view of the counter device ofFIG. 3 . -
FIG. 5 is another perspective exploded view of the counter device ofFIG. 3 . -
FIG. 6 is a perspective view of a gear system of the instrument ofFIG. 2 , in accordance with some embodiments. -
FIG. 7 is a perspective exploded view of the gear system ofFIG. 6 . -
FIG. 8 is a perspective view of a component of the gear system ofFIG. 6 . -
FIG. 9 is another perspective view of the component of the gear system ofFIG. 6 . -
FIG. 10A is a top view of the gear system ofFIG. 6 in a first position. -
FIG. 10B is a top view of the gear system ofFIG. 6 adjusted to a second position. -
FIGS. 11A-B are views of a flow meter in a fluid flow system, in accordance with some embodiments. -
FIG. 12 is a perspective view of an index instrument shown inFIGS. 11A-B . -
FIG. 13 is another perspective view of the index instrument of inFIG. 12 . -
FIGS. 14A-B are views of a flow meter in a fluid flow system, in accordance with some embodiments. - Like reference symbols in the various drawings indicate like elements.
- Referring to
FIGS. 1A-B , afluid flow system 10 may include one ormore conduits flow meter 100. The fluid can include a gas, a liquid, or a particulate slurry, or any combination thereof Thefluid flow system 10 can includecontrol valves flow meter 100. Optionally, theflow system 10 may include abypass valve 34 that can be opened to permit the fluid to bypass theflow meter 100 andconduit 22. Theflow meter 100 may be incorporated into thefluid flow system 10 to provide information related to the fluid flow in the system 10 (e.g., to measure a volume of the fluid passing through the flow meter 100). For example, theflow meter 100 can be used in a natural gas flow system to measure the amount of natural gas transmitted through theconduit 22 and to a user. Such measurements by theflow meter 100 can be collected for purposes of billing the user of the natural gas. - One or more instruments can be coupled to the
flow meter 100 to provide information related to the fluid flow through theflow meter 100. Examples of such instruments include anindex instrument 110, aninstrument drive device 130, and acorrector instrument 150. Each of these instruments can be operated by the energy generated from the fluid that flows through theflow meter 100. For example, theflow meter 100 may comprise a rotary positive displacement gas meter that includes impellers (not shown inFIGS. 1A-B ) to rotate when the fluid passes through theflow meter 100 and act upon the impellers. The rotation of the impellers can be translated to rotation of a shaft, which is used to drive the one or more instruments coupled to theflow meter 100. For example, theindex instrument 110 may be assembled to theflow meter 100 so that a mechanical counter device indicates the amount of fluid flow through the flow meter 100 (refer also toFIG. 2 ). Theindex instrument 110 may include a gear assembly that causes the mechanical counter device to incrementally adjust in response to rotation of the impellers inside theflow meter 100. In another example, theinstrument drive device 130 can be mounted to the flow meter 100 (either directly or indirectly via the index instrument 110) to translate rotational motion from the impellers to adrive shaft 135, which can be used to operate a number of accessory instruments such as the corrector instrument 150 (described in more detail below). - Still referring to
FIGS. 1A-B , at least one of theinstruments flow meter 100 in a first flow direction (FIG. 1A ) or in the second, opposite flow direction (FIG. 1B ). In this embodiment, theinstrument 150 mounted to theinstrument drive 130 is configured to provide such an automatic adjustment. For example, theinstrument 150 can include a self-adjusting gear system 180 (described in more detail below in connection withFIGS. 10A-B ) that automatically shifts position to provide a positive output independent of whether thedrive shaft 135 rotates in a first direction (FIG. 1A ) or a second, opposite direction (FIG. 1B ). In this embodiment, theinstrument 150 is a corrector instrument that includes amechanical counter device 160 and anelectronic counter device 170. Because thecorrector instrument 150 includes the self-adjustinggear system 180, thecorrector instrument 150 is capable of performing its output function by counting upward in positive increments regardless of the positive rotational direction of thedrive shaft 135 on the instrument drive device 130 (e.g., independent of whether thedrive shaft 135 rotates in a first direction (FIG. 1A ) or a second, opposite direction (FIG. 1B )). - Thus, if the
corrector instrument 150 is to be installed while theflow meter 100 is in the field of operation (e.g., already mounted into the flow system 10), theinstrument 150 can be readily installed to theflow meter 100 without the need to partially disassemble the instrument and manually adjust internal gears. For example, the field technician is not required to consider the positive direction of the fluid flow and thereafter manually adjust the instrument's internal gears in accordance with the positive rotational direction of thedrive shaft 135. Rather, as described below, the field technician can readily mount theinstrument 150 to theinstrument drive 130, and theinstrument 150 will self-adjust itsinternal gear system 180 to account for the positive direction of the fluid flow (and the positive rotational direction of the drive shaft 135).FIGS. 1A-B illustrate an example of this functionality. - As shown in
FIG. 1A , theflow system 10 may be configured so that the fluid passes through theflow meter 100 in a first direction and then through theconduit 22. For example, the fluid enters theflow meter 100 through afirst port 105 and then exits theflow meter 100 through asecond port 106. Accordingly, when theflow meter 100 is mounted into theflow system 10 in this orientation, the fluid acts upon the impellers (not shown inFIG. 1A ) of theflow meter 100 to drive the rotation of the impellers. This rotational motion of the impellers can be translated to theindex instrument 110 and theinstrument drive device 130 via a number of shafts and gears. Thus, the positive flow through theflow meter 100 in the first direction (FIG. 1A ) causes thedrive shaft 135 of theinstrument drive device 130 to have a positive rotation in a first direction. Thecorrector instrument 150 can be mounted to theinstrument drive device 130 so that thedrive shaft 135 is coupled to the self-adjustinggear system 180 of theinstrument 150. As described in more detail below, thecorrector instrument 150 is capable of performing its output function by counting upward in positive increments independent of the positive rotational direction of thedrive shaft 135 on theinstrument drive device 130. Thus, thecorrector instrument 150 can be mounted to theinstrument drive device 130 without the need to partially disassemble theinstrument 150 and manually adjust internal gears. - As shown in
FIG. 1B , theflow system 10 alternatively may be configured so that the fluid passes through theflow meter 100 in a second direction and then through theconduit 22. For example, in this alternative configuration, fluid enters theflow meter 100 through thesecond port 106 and exits theflow meter 100 through thefirst port 105. When the flow meter is mounted into theflow system 10 in this orientation, the fluid acts upon the impellers (not shown inFIG. 1B ) of theflow meter 100 to drive the impellers in a direction opposite that described in connection withFIG. 1A . Again, this rotational motion of the impellers can be translated to theindex instrument 110 and theinstrument drive device 130 via a number of shafts and gears. Thus, the positive flow through theflow meter 100 in the second direction (FIG. 1B ) causes thedrive shaft 135 of theinstrument drive device 130 to have a positive rotation in a second direction. Even though the positive rotational direction of thedrive shaft 135 is in the second direction opposite the first direction shown inFIG. 1A , thecorrector instrument 150 can nevertheless be mounted to theinstrument drive device 130 without the need to partially disassemble theinstrument 150 and manually adjust internal gears. Due to the operation of the gear system 180 (described below, for example, in connection withFIGS. 10A-B ), thecorrector instrument 150 is capable of automatically adjusting to count upward in positive increments regardless of the positive rotational direction of thedrive shaft 135 on theinstrument drive device 130. - It should be understood from the description herein that, in other embodiments, the self-adjusting
gear system 180 may be implemented in other instruments for theflow meter 100. For example, as described in more detail below in connection withFIGS. 11A-B and 12-13, the self-adjustinggear system 180 may be arranged in theindex instrument 110 so that the index instrument counts in positive increments regardless of whether the fluid flow through themeter 100 is in the first direction (FIG. 11A ) or the second direction (FIG. 11B ). In another example, as described in more detail below in connection withFIGS. 14A-B , the self-adjustinggear system 180 may be arranged in theinstrument drive device 130 so that thedrive shaft 135 rotates in one direction independent of whether the positive fluid flow through the meter is in the first direction (FIG. 14A ) or the second direction (FIG. 14B ). - Referring now to
FIG. 2 , theindex instrument 110, theinstrument drive device 130, and thecorrector instrument 150 can be mounted to theflow meter 100 so that the rotation of the flow meter's impellers (not shown inFIG. 2 ) drives the operation of these instruments. In this embodiment, theindex instrument 110 is directly mounted to theflow meter 100 using a number of bolts. When the fluid flows into one of theports mechanical counter device 114 in theindex instrument 110 to operate. For example, themechanical counter device 114 may comprise an indicator (e.g., having an appearance similar to a vehicle odometer) that displays information related to the fluid flow through theflow meter 100, such as a volume of fluid passing through theflow meter 100. In some circumstances, the information provided by themechanical counter device 114 of theindex instrument device 110 may comprise raw data that is not necessarily corrected for temperature or pressure variations in the fluid flow. Theindex instrument 110 may include awindow panel 112 so that a user located at theflow meter 100 can view the information provided by theindex instrument 110. - The
instrument drive device 130 can be indirectly mounted to theflow meter 100 via theindex instrument 110. Accordingly, when the fluid flows into one of theports flow meter 100, the rotation of the impellers is translated (via a number of shafts and gears disposed in theindex instrument 110 and in the instrument drive device 130) to thedrive shaft 135. As such, in this embodiment, the positive direction of fluid flow through theflow meter 100 dictates the positive direction of rotation for the drive shaft (refer, for example, toFIGS. 1A-B ). Thedrive shaft 135 may extend from a mountingplatform 132 of theinstrument drive device 130 so that an accessory instrument (e.g., a corrector instrument, a chart recorder, or the like) can connect with the mountingplatform 132 and engage thedrive shaft 135. In this embodiment, thecorrector instrument 150 is indirectly mounted to theflow meter 100 via theinstrument drive device 130 and engages thedrive shaft 135. - Still referring to
FIG. 2 , thecorrector instrument 150 may include afirst assembly 152 that is mountable to theinstrument drive device 130 and asecond assembly 170 that is connected to thefirst assembly 152. Thefirst assembly 152 can house the self-adjusting gear system 180 (refer toFIGS. 5-7 ), which couples with thedrive shaft 135 when thecorrector instrument 150 is mounted to theinstrument drive device 130. In addition, thefirst assembly 152 may house amechanical counter device 160 that is viewable through awindow panel 155 of thefirst assembly 152. Themechanical counter device 160 may comprise an indicator (e.g., having an appearance similar to a vehicle odometer) that displays information related to the fluid flow through theflow meter 100. For example, themechanical counter device 160 may comprise an eight-digit indicator displaying a value for a volume of fluid that passes through theflow meter 100. At least a portion of thewindow panel 155 is transparent so that the indicator is viewable to a user located at theflow meter 100. - The
second assembly 170 may be in the form of an electronic counter device that generates electronic data related to the fluid flow through theflow meter 100. For example, theelectronic counter device 170 may house a pulser circuit that senses the rotation of a shaft-mounted magnet 189 (FIGS. 5-6 ) arranged in thefirst assembly 152. As such, theelectronic counter device 170 can correlate the detected magnet rotations with the fluid flow through theflow meter 100. In some circumstances, theelectronic counter device 170 can correct these values to account for variations in temperature, pressure, or both. Theelectronic counter device 170 may include a user interface 172 (e.g., an electronic display device, one or more buttons, one or more dials, or the like) and at least onecommunication output 174. Thecommunication output 174 can be used, for example, to communicate one or more signals to a remote site via a hardwire connection, a fiber optic cable connection, a wireless communication connection (e.g., RF communication, infrared communication, cellular communication, satellite communication), or the like. As such, the information gathered by theelectronic counter device 170 can be communicated to the remote site (e.g., a central service station) for the purpose of periodically monitoring the fluid flow through theflow meter 100. In this example, the data signals from theelectronic counter device 170 can indicate a corrected fluid volume, an uncorrected fluid volume, and an alarm condition. These signals can be communicated to the remote site for purposes of monitoring the fluid flow, billing the consumer of fluid, or a combination thereof. - Still referring to
FIG. 2 , thecorrector instrument 150 may operate when thedrive shaft 135 of theinstrument drive device 130 rotates, thereby causing the self-adjusting gear system 180 (described, for example, in connection withFIGS. 6-10B ) to urge both themechanical counter device 160 and theelectronic counter device 170 to operate. Accordingly, in some circumstances, the accuracy of the information communicated by theelectronic counter device 170 can be verified by viewing themechanical counter device 160 arranged in thecorrector instrument 150. As previously described, themechanical counter device 160 and theelectronic counter device 170 of thecorrector instrument 150 count upward in positive increments independent of whether thedrive shaft 135 rotates in a first direction (FIG. 1A ) or a second, opposite direction (FIG. 1B ). In some embodiments, themechanical counter device 160, theelectronic counter device 170, or both may indicate corrected values that account for variations in temperature, pressure, or both. If, for example, themechanical counter device 160 indicates the uncorrected fluid volume, the accuracy of theelectronic counter device 170 can be periodically evaluated by comparing the readings of themechanical counter device 160 to the uncorrected fluid volume data transmitted by theelectronic counter device 170. - Referring to
FIGS. 3-5 , themechanical counter device 160 of the corrector instrument 150 (FIG. 2 ) may be driven by the self-adjustinggear system 180, which is capable of outputting positive rotation in a forward rotational direction in response to rotation from the drive shaft 135 (FIG. 2 ). Themechanical counter device 160 hashousing components indicator mechanism 163 that incrementally adjusts in response to the output rotation of thegear system 180. For example, theindicator mechanism 163 may comprise an eight-digit indicator (e.g., having an appearance similar to a vehicle odometer) that is used to indicate a volume of fluid that passes through the flow meter 100 (FIG. 2 ). Because the self-adjustinggear system 180 does not output rotation in a reverse direction (opposite the forward direction), theindicator mechanism 163 is not urged to count downward in negative increments. - In some embodiments, the
gear system 180 includes aninput shaft 181 that engages the drive shaft 135 (FIG. 2 ) of theinstrument drive device 130 such that theinput shaft 181 rotates in response to rotation of thedrive shaft 135. For example, theinput shaft 181 may indirectly engage thedrive shaft 135 via a drive dog connection (not shown inFIGS. 3-5 ). Theinput shaft 181 is coupled to an input gear 182 (FIG. 5 ), which drives anoutput gear 184 via an idler gear assembly 185 (FIG. 5 ). As described in more detail below in connection withFIGS. 6-10B , theidler gear assembly 185 is capable of automatically adjusting positions so that theoutput gear 184 rotates in the forward rotational direction independent of the rotational direction of theinput gear 182. Accordingly, anoutput shaft 186 that is coupled to theoutput gear 184 also rotates in the forward rotational direction both when theinput shaft 181 rotates in a first direction and when theinput shaft 181 rotates in a second opposite direction. - Still referring to
FIGS. 3-5 , abevel gear 188 and amagnet 189 are arranged on theoutput shaft 186 of thegear system 180. Thebevel gear 188 is used to drive the rotation of thegear train 164 for theindicator mechanism 163. Thegear train 164 may provide a rotational translation between thegear system 180 and theindicator mechanism 163 so that one rotation by the input shaft (or the drive shaft 135 (FIG. 2 )) correlates to a particular volume of fluid that is incrementally counted by theindicator mechanism 163. Themagnet 189 is rotated by the output shaft, and as previously described, the magnet rotations can be sensed by the electronic counter device 170 (FIG. 2 ) to indicate a volume of fluid that passes through theflow meter 100. Because the self-adjustinggear system 180 drives the output shaft to always rotate in the forward rotational direction (independent of the rotational direction of the input shaft 181), thebevel gear 188 and themagnet 189 likewise rotate in the forward rotational direction. Such a configuration causes theindicator mechanism 163 and the electronic counter device 170 (FIG. 2 ) to count upwardly in positive increments independent of whether thedrive shaft 135 rotates in a first direction (FIG. 1A ) or a second, opposite direction (FIG. 1B ). Thus, a field technician is not required to consider the positive direction of the fluid flow through the meter 100 (FIG. 2 ) and thereafter manually adjust internal components of the instrument 150 (FIG. 2 ) in accordance with the positive rotational direction of thedrive shaft 135. Rather, the field technician can readily mount theinstrument 150 to the instrument drive 130 so that thedrive shaft 135 couples with thegear system 180, and thegear system 180 will automatically adjust to account for the positive direction of the fluid flow (and the corresponding rotational direction of the drive shaft 135). - Referring again to
FIG. 2 and also toFIGS. 3-4 , some embodiments of theinstrument 150 may have a construction that reduces the likelihood of tampering. For example, some instruments may include a panel that is readily removable to access internal gears for manual adjustment by a field technician. With these instruments, an individual may attempt to remove the panel and tamper with the internal components so that the instrument does not accurately measure the fluid flow through the flow meter 100 (e.g., undercount the fluid flow to cause inaccurately lower bills). In the particular embodiment of theinstrument 150 depicted inFIG. 2 , such attempts to tamper with the internal components may be hindered because no such access panel is available to the tampering individual. As shown inFIG. 2 , thefirst assembly 152 of theinstrument 150 houses themechanical counter 160, which is accessible only after removing thefront window 155. As shown inFIGS. 3-4 , thegear system 180 is further protected from tampering because it is contained within thehousing components mechanical counter device 160. Thus, in this embodiment, one must disassemble the mechanical counter device from the first assembly 152 (FIG. 2 ) and then disassemble thehousing mechanical counter device 160 in order to access thegear system 180. Because the self-adjustinggear system 180 can automatically adjust to account for the positive flow direction through theflow meter 100, no access panel is required (in this embodiment) for manual adjustment by a field technician. Thus, in this embodiment, no access panel is available for an individual to readily remove and tamper with the internal components of theinstrument 150. - Referring now to
FIGS. 6-7 , some embodiments of the self-adjustinggear system 180 include anidler gear assembly 185 that can automatically adjust positions in response to the rotational direction of theinput shaft 181. In this embodiment, thegear system 180 has a construction such that thegear system 180 as a whole can be readily assembled into (or removed from) thehousing components FIG. 4 ). For example, theinput gear 182, theoutput gear 184, and theidler gear assembly 185 may be retained generally in a plane with one another between two mounting plates that are bolted together. Theinput shaft 181 can be coupled to theinput gear 182 so that a portion of theinput shaft 181 extends downwardly from the mounting plates toward the drive shaft 135 (FIG. 2 ) of theinstrument drive device 130. Also, theoutput shaft 186 can be coupled to theoutput gear 184 so that theoutput shaft 186 extends upwardly from the mounting plates toward the gear train 164 (FIG. 5 ) of themechanical counter device 160. As previously described, thebevel gear 188 and themagnet 189 are received on theoutput shaft 186 to rotate with the output shaft. - The
idler gear assembly 185 may be movable relative to theinput gear 182 and theoutput gear 184. For example, in this embodiment, theidler gear assembly 185 can pivot about anaxis 195 relative to theinput gear 182 and theoutput gear 186. Theidler gear assembly 185 may include amovable body 190 that retainsidler gears 192 and 194 (refer also toFIG. 9 ). Themovable body 190 includes aguide pin 193 that is movable within aguide slot 183 of the gear system mounting plate. Also, themovable body 190 includes apivot pin 196 that pivots about theaxis 195 when theguide pin 193 moves within theguide slot 183. Such a pivoting motion of theidler gear assembly 185 may occur automatically in response to the rotational direction of theinput shaft 181 and theinput gear 182. Thus, the self-adjustinggear system 180 may not require manual adjustment by a field technician at the time of instrument installation. As described in more detail below, such a pivoting motion of theidler gear assembly 185 can cause at least one of the idler gears (e.g., idler gear 194) to become engaged or disengaged with theoutput gear 184. - Referring to
FIGS. 8-9 , in this embodiment, theidler gear assembly 185 retains two ormore gears idler gear 192 is rotatable about its central longitudinal axis relative to themovable body 190, and thesecond idler gear 194 is rotatable about its central longitudinal axis relative to themovable body 190. In these circumstances, one or both of the idler gears 192 and 194 can rotate with the input and output gears 182 and 184 (FIGS. 6-7 ) while themovable body 190 is in a first position (refer toFIG. 10A ) or a second position (refer toFIG. 10B ). Theguide pin 193 and thepivot pin 196 can be integrally formed with themovable body 190, for example, during a polymer molding process. Thereafter, the first and second idler gears 192 and 194 can be assembled with themovable body 190 so that the idler gears 192 and 194 are rotatable relative to themovable body 190. In this embodiment, thepivot pin 196 is arranged between the central axis of thefirst idler gear 192 and the central axis of thesecond idler gear 194. As such, the idler gears 192 and 194 adjust positions relative to the input and output gears 182 and 184 (FIGS. 6-7 ) when themovable body 190 pivots about thepivot axis 195 of thepivot pin 196. - Referring now to
FIGS. 10A-B , the self-adjustinggear system 180 is configured to automatically shift position in response to theinput shaft 181 rotating in one of a first direction and a second, opposite direction. In such circumstances, theinstrument 150 in which thegear system 180 is incorporated can automatically adjust and readily provide a positive output regardless of the fluid flow direction through the flow meter (FIG. 2 ). For example, theinstrument 150 can include the mechanical counter device 160 (FIG. 2 ) and the electronic counter device 170 (FIG. 2 ) that count an amount of fluid flow in positive increments when theoutput shaft 186 of thegear system 180 is rotated in a forwardrotational direction 197. Thus, forward rotation of theoutput shaft 186 can drive the positive counting operations by the mechanical counter device 160 (FIG. 2 ) and the electronic counter device 170 (FIG. 2 ). In this embodiment, theidler gear assembly 185 is adjustable relative to theinput gear 182 and theoutput gear 184 so as to cause theoutput gear 184 to rotate in the forwardrotational direction 197 regardless of whether theinput gear 182 rotates in afirst direction 198a (FIG. 10A ) or in a second,opposite direction 198 b (FIG. 10B ). As such, theoutput shaft 186 can rotate the bevel gear 188 (to drive the mechanical counter device 160 (FIGS. 4-5 )) and the magnet 189 (to drive the electronic counter device 170 (FIG. 2 )) in the forwardrotational direction 197 both when theinput shaft 181 is driven in thefirst direction 198 a (FIG. 10A ) and when theinput shaft 181 is driven in thesecond direction 198 b (FIG. 10B ). - As shown in
FIG. 10A , theinput shaft 181 of thegear system 180 may be driven in the firstrotational direction 198 a by thedrive shaft 135 of the instrument drive device 130 (as described in connection withFIG. 1A ). In this embodiment, theinput shaft 181 is directly coupled to theinput gear 182, so theinput gear 182 also rotates in the firstrotational direction 198 a. In response, theidler gear assembly 185 is urged toward to a first orientation so that the output gear rotates in the forwardrotational direction 197. In particular, themovable body 190 of theidler gear assembly 185 is positioned so that theguide pin 193 is in a first condition within theguide slot 183. If theguide pin 193 was not previously in this condition within theguide slot 183, themovable body 190 will automatically pivot to this condition (e.g., pivot about pivot pin 196) when theinput gear 182 begins to rotate in the firstrotational direction 198 a. Theidler gear assembly 185 is urged to this first orientation in response to the rotation of the input gear in thefirst direction 198 a because the teeth of theinput gear 182 act upon the teeth of thefirst idler gear 192, thereby causing a torque about thepivot pin 196. Such a torque abut thepivot pin 196 can urge theguide pin 193 toward the condition depicted inFIG. 10A . When theidler gear assembly 185 is in this first orientation, thefirst idler gear 192 engages both theinput gear 182 and theoutput gear 184 while thesecond idler gear 194 is separated from theinput gear 182 and theoutput gear 184. Accordingly, theinput gear 182 is driven in the firstrotational direction 198 a, and thefirst idler gear 192 translates this motion to theoutput gear 184 so that the output gear 184 (and theoutput shaft 186 coupled thereto) rotates in the forwardrotational direction 197. - As shown in
FIG. 10B , if theinput shaft 181 is driven in the secondrotational direction 198 b by thedrive shaft 135 of the instrument drive device 130 (as described in connection withFIG. 1B ), the self-adjustinggear system 180 can automatically adjust to so that the output gear 184 (and theoutput shaft 186 coupled thereto) rotates in the forwardrotational direction 197. As previously described, theinput shaft 181 in this embodiment is directly coupled to theinput gear 182, so theinput gear 182 also rotates in the secondrotational direction 198 b. In response, theidler gear assembly 185 is urged toward a second orientation in which themovable body 190 is positioned so that theguide pin 193 is in a second condition within theguide slot 183. If theguide pin 193 was not previously in this condition depicted inFIG. 10B , theguide pin 193 may move adisplacement distance 199 within the guide slot 183 (e.g., themovable body 190 pivots about the pivot pin 196) when theinput gear 182 begins to rotate in the secondrotational direction 198 b. As previously described, theidler gear assembly 185 is urged to this second orientation in response to the rotation of theinput gear 182 in thesecond direction 198 b because the teeth of theinput gear 182 act upon the teeth of thefirst idler gear 192, thereby causing a torque about thepivot pin 196. Such a torque abut thepivot pin 196 can urge theguide pin 193 to move thedisplacement distance 199 toward the condition depicted inFIG. 10B . When theidler gear assembly 185 is in this second orientation, thefirst idler gear 192 directly engages theinput gear 182 while thesecond idler gear 194 directly engages theoutput gear 184. In these circumstances, theinput gear 182 is driven in the secondrotational direction 198 b, and thefirst idler gear 192 translates this motion to thesecond idler gear 194. Thesecond idler gear 194 acts upon theoutput gear 184 so that the output gear 184 (and theoutput shaft 186 coupled thereto) rotates in the forwardrotational direction 197. - Accordingly, the
instrument 150 in which thegear system 180 resides can be self-adjusting so that theinstrument 150 performs its output function independent of whether fluid passes through theflow meter 100 in a first flow direction (FIG. 1A ) or in the second, opposite flow direction (FIG. 1B ). In this embodiment, thecorrector instrument 150 is mounted to theinstrument drive device 130 and is capable of automatically adjusting to provide a positive output independent of whether thedrive shaft 135 rotates in a first direction or a second, opposite direction (refer, for example, toFIGS. 1A-B ). Because thecorrector instrument 150 includes the self-adjustinggear system 180, thecorrector instrument 150 is capable of performing its output function by counting upward in positive increments independent of the positive rotational direction of thedrive shaft 135 on theinstrument drive device 130. - Such a feature can be useful if the
corrector instrument 150 is to be installed while theflow meter 100 is in the field of operation (e.g., already mounted into theflow system 10 as shown inFIG. 1A orFIG. 1B ). In particular, theinstrument 150 can be installed to theflow meter 100 without the need to partially disassemble theinstrument 150 and manually adjust internal gears. For example, the field technician is not required to consider the positive direction of the fluid flow and thereafter manually adjust the instrument's internal gears in accordance with the positive rotational direction of thedrive shaft 135. Rather, the field technician can readily mount theinstrument 150 to theinstrument drive 130, and the self-adjustinggear system 180 of the instrument will act accordingly to account for the positive direction of the fluid flow (and the positive rotational direction of the drive shaft 135). - It should be understood that the self-adjusting gear system may be used in instruments other than the corrector instrument. For example, the self-adjusting
gear system 180 may be arranged in theindex instrument 110, theinstrument drive device 130, or in other accessory instruments that mount to the instrument drive device 130 (e.g., a chart recorder instrument or the like). - Referring to
FIGS. 11A-B and 12-13, the self-adjustinggear system 180 may be arranged in anindex instrument 210 so that acounter device 214 of theindex instrument 210 counts in positive increments regardless of whether the positive fluid flow through themeter 100 is in the first direction (FIG. 11A ) or the second direction (FIG. 11B ). Similar to theindex instrument 110 previously described in connection withFIG. 2 , theindex instrument 210 may be assembled to theflow meter 100 so that the counter device 214 (FIGS. 12-13 ) indicates the amount of fluid flow through theflow meter 100. Theindex instrument 210 may include a gear train that causes thecounter device 214 to incrementally adjust in response to rotation of the impellers inside theflow meter 100. As described below, the self-adjustinggear system 180 may be incorporated into the gear train of theindex instrument 210. - Referring to
FIGS. 11A-B , theindex instrument 210 is directly mounted to theflow meter 100 using a number of bolts. When the fluid flows into one of theports FIGS. 12-13 ) to rotate, which drives thecounter device 214 to operate (e.g., via the gear train). For example, thecounter device 214 may be a mechanical counter device including an indicator (e.g., having an appearance similar to a vehicle odometer) that displays information related to the fluid flow through theflow meter 100, such as a volume of fluid passing through theflow meter 100. Similar to the embodiments previously described in connection withFIG. 2 , theindex instrument 210 may include awindow panel 212 so that a user located at theflow meter 100 can view the information provided by theindex instrument 210. - The self-adjusting
gear system 180 may be incorporated into theindex instrument 210 so that theindex instrument 210 can self-adjust to perform its output function independent of whether fluid passes through theflow meter 100 in a first flow direction (FIG. 11A ) or in the second opposite flow direction (FIG. 11B ). As previously described in connection withFIGS. 10A-B , the self-adjustinggear system 180 can automatically shift positions to provide a positive output independent of whether the connector shaft 215 (e.g., coupled to the flow meter impellers) rotates in a first direction (FIG. 11A ) or a second, opposite direction (FIG. 11B ). Because theindex instrument 210 includes the self-adjustinggear system 180, theindex instrument 210 is capable of performing its output function by counting upward in positive increments regardless of the positive rotational direction of the connector shaft 215 (FIGS. 12-13 )). - Still referring to
FIGS. 11A-B , theinstrument drive device 130 is coupled to theflow meter 100 via theindex instrument 210. As such, the rotation of thedrive shaft 135 of theinstrument drive device 130 is directed by the output rotation from theindex instrument 210. Because theindex instrument 210 includes the self-adjustinggear system 180, the output rotation of theindex instrument 210 is in one rotational direction independent of whether fluid passes through theflow meter 100 in a first flow direction (FIG. 11A ) or in the second opposite flow direction (FIG. 11B ). Accordingly, thedrive shaft 135 rotates in one direction independent of whether the positive fluid flow through the meter is in the first direction (FIG. 11A ) or the second direction (FIG. 11B ). Thus, if anaccessory instrument 250 is to be installed while theflow meter 100 is in the field of operation (e.g., already mounted into the flow system 10), theinstrument 250 can be installed to theinstrument drive device 130 without the need to partially disassemble theinstrument 250 and manually adjust internal gears. For example, the field technician is not required to consider the positive direction of the fluid flow and thereafter manually adjust the instrument's internal gears in accordance with the positive rotational direction of thedrive shaft 135. Rather, as previously described, the field technician can readily mount theinstrument 250 to theinstrument drive 130 because thedrive shaft 135 rotates in one direction independent of whether the positive fluid flow through the meter is in the first direction (FIG. 11A ) or the second direction (FIG. 11B ). In such circumstances, theaccessory instrument 250 can be designed according to the one rotational direction of thedrive shaft 135. - Referring to
FIGS. 12-13 , theconnector shaft 215 of theindex instrument 210 is attachable to theflow meter 100 so that theconnector shaft 215 rotates in response to the rotation of the flow meter impellers (not shown inFIGS. 12-13 ). Theconnector shaft 215 may engage the self-adjustinggear system 180 incorporated in theindex instrument 210. In this embodiment, theconnector shaft 215 serves as an input shaft to thegear system 180 by engaging theinput gear 182 via an intermediate gear (refer toFIG. 13 ). In other embodiments, theconnector shaft 215 may be directly coupled to the input gear 182 (e.g., acting as a direct input shaft for the gear system 180). - As shown in
FIG. 13 , the self-adjustinggear system 180 is configured to provide forward rotation to theoutput shaft 186, which drives thegear train 216 of theindex instrument 210 in a positive direction to act upon thecounter device 214. As such, thecounter device 214 is capable of counting in positive increments in response to both rotation of theconnector shaft 215 in a first direction and rotation of theconnector shaft 215 in a second opposite direction. Similar to the operation previously described in connection withFIGS. 10A-B , thegear system 180 includes theinput gear 182, the output gear 184 (not shown inFIG. 13 ; refer toFIGS. 10A-B ), and theidler gear assembly 185 that pivots between a first orientation and a second orientation depending on the rotational direction of theinput gear 182. For example, theguide pin 193 may be in one condition in theguide slot 183 when theidler gear assembly 185 is in the first orientation, and theguide pin 193 may be in a different condition within theguide slot 183 when theidler gear assembly 185 is in the second orientation. Such automatic adjustment by the idler gear assembly maintains the output rotation of theoutput shaft 186 in the forward rotational direction. Accordingly, theindex instrument 210 can self-adjust to perform its output function independent of whether theconnector shaft 215 is driven by the flow meter in a first direction or in a second opposite direction (e.g., independent of whether fluid passes through theflow meter 100 in a first flow direction (FIG. 11A ) or in the second opposite flow direction (FIG. 11B ). - Referring now to
FIGS. 14A-B , the self-adjustinggear system 180 may be incorporated into an instrument drive device 230 so that adrive shaft 235 rotates in one direction independent of whether the positive fluid flow through the meter is in the first direction (FIG. 14A ) or the second direction (FIG. 14B ). Similar to theinstrument drive device 130 previously described in connection withFIG. 2 , the instrument drive device 230 may be assembled to theflow meter 100 so that the drive shaft rotates in response to fluid flow through theflow meter 100. For example, the instrument drive device 230 and theindex instrument 110 may include a number of shafts and gears that cause thedrive shaft 235 to rotate in response to rotation of the impellers inside theflow meter 100. As described below, the self-adjustinggear system 180 may be incorporated into the gear train of the instrument drive device 230. - In this embodiment, the instrument drive device 230 is indirectly mounted to the flow meter 100 (e.g., via the index instrument 110). Because the instrument drive device 230 includes the self-adjusting
gear system 180, the output rotation of thedrive shaft 235 is in one direction independent of whether fluid passes through theflow meter 100 in a first flow direction (FIG. 14A ) or in the second opposite flow direction (FIG. 14B ). Similar to the operation previously described in connection withFIGS. 10A-B , thegear system 180 includes theidler gear assembly 185 that pivots between a first orientation and a second orientation depending on the rotational direction of theinput gear 182. Such automatic adjustment by theidler gear assembly 185 maintains the output rotation of thegear system 180 in the forward rotational direction. Accordingly, the instrument drive device 230 can self-adjust to perform its output function independent of whether fluid passes through theflow meter 100 in a first flow direction (FIG. 14A ) or in the second opposite flow direction (FIG. 14B ). - Still referring to
FIGS. 14A-B , when anaccessory instrument 250 is to be installed while theflow meter 100 is in the field of operation (e.g., already mounted into the flow system 10), theinstrument 250 can be installed to the instrument drive device 230 without the need to partially disassemble theinstrument 250 and manually adjust internal gears. For example, the field technician is not required to consider the positive direction of the fluid flow and thereafter manually adjust the instrument's internal gears in accordance with the positive rotational direction of thedrive shaft 235. Rather, as previously described, the field technician can readily mount theinstrument 250 to the instrument drive device 230 because thedrive shaft 235 rotates in one direction independent of whether the positive fluid flow through the meter is in the first direction (FIG. 14A ) or the second direction (FIG. 14B ). In these circumstances, theaccessory instrument 250 can be designed according to the one rotational direction of thedrive shaft 235. - A number of embodiments of the invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. Accordingly, other embodiments are within the scope of the following claims.
Claims (19)
1. A method for mounting an instrument to a flow meter, the method comprising:
identifying a flow meter installed in a fluid flow system such that fluid passes through the flow meter in a flow direction defined by a first flow direction or a second opposite flow direction; and
mounting an instrument to the flow meter without manually adjusting an internal gear of the instrument to account for the flow direction through the flow meter, the instrument comprising a counter device that provides information related to the fluid flow through the flow meter,
wherein the step of mounting the instrument causes the instrument to automatically adjust so that the counter device counts in positive increments independent of whether fluid passes through the flow meter in the first flow direction or in the second opposite flow direction.
2. The method of claim 1 , further comprising providing the instrument which includes a self-adjusting gear system that automatically shifts position in response to fluid flow through the flow meter in the first flow direction or in the second opposite flow direction.
3. The method of claim 2 , wherein the step of providing the instrument comprises providing at least one of a corrector instrument, an instrument drive device, and an index instrument.
4. The method of claim 3 , wherein the step of mounting the instrument comprises mounting the corrector instrument indirectly to the flow meter.
5. The method of claim 1 , wherein mounting the instrument to the flow meter includes coupling an input shaft of the instrument to a portion of the flow meter such that the input shaft is driven to rotate in a first direction or in a second opposite direction when the fluid passes through the flow meter in the flow direction.
6. The method of claim 5 , wherein mounting the instrument to the flow meter causes an output shaft of the instrument to rotate in a forward rotational direction in response to any rotation of the input shaft in the first direction and any rotation of the input shaft in the second opposite direction, the rotation of the output shaft causing a data device to collect information related to the flow meter.
7. The method of claim 6 , wherein mounting the instrument to the flow meter causes the input shaft of the instrument to rotate in the first direction when the fluid passes through the flow meter in the first flow direction and causes the input shaft of the instrument to rotate in the second opposite direction when the fluid passes through the flow meter in the second opposite flow direction, wherein the instrument comprises a gear system that automatically adjusts to thereby direct the output shaft in the forward rotational direction in response to any rotation of the input shaft in the first direction and any rotation of the input shaft in the second opposite direction.
8. The method of claim 7 , wherein the output shaft of the instrument rotates only in the forward rotational direction both when fluid passes through the flow meter in the first flow direction and when fluid passes through the flow meter in the second opposite flow direction.
9. The method of claim 1 , wherein mounting the instrument to the flow meter comprises mounting the instrument to a rotary positive displacement meter.
10. The method of claim 1 , wherein mounting the instrument to the flow meter comprises activating a data device of the instrument to transmit a signal to a location remote from the flow meter, the signal indicating a volume of fluid passing through the flow meter.
11. The method of claim 10 , wherein the step of mounting the instrument causes the instrument to automatically adjust so that the data device indicates the volume of fluid passing through the flow meter independent of whether fluid passes through the flow meter in the first flow direction or in the second opposite flow direction.
12. A method for mounting an instrument to a flow meter, the method comprising:
identifying a flow meter installed in a fluid flow system such that fluid passes through the flow meter in a flow direction defined by a first flow direction or a second opposite flow direction; and
mounting a corrector instrument to an instrument drive device of the flow meter, the corrector instrument comprising an input shaft that is driven to rotate in a first direction or in a second opposite direction by the instrument drive device of a flow meter, an output shaft that rotates in response to rotation of the input shaft, and an electronic data device that detects rotation of magnet coupled to the output shaft and that generates information related to an amount of fluid flow through the flow meter,
wherein the step of mounting the corrector instrument causes the corrector instrument to automatically adjust so that the electronic data device determines the amount of fluid flow through the flow meter independent of whether fluid passes through the flow meter in the first flow direction or in the second opposite flow direction.
13. The method of claim 12 , wherein mounting the corrector instrument to the instrument drive device of the flow meter causes a mechanical counter device to be driven by the output shaft and to indicate information related to a measured amount of fluid flow through the flow meter, the mechanical counter device being different from the electronic data device.
14. The method of claim 13 , further comprising physically accessing the mechanical counter device only after removal of the mechanical counter device from the corrector instrument.
15. The method of claim 12 , wherein the output shaft of the corrector instrument rotates only in a forward rotational direction both when fluid passes through the flow meter in the first flow direction and when fluid passes through the flow meter in the second opposite flow direction.
16. The method of claim 12 , wherein mounting the corrector instrument to the instrument drive device of the flow meter comprises mounting the corrector instrument to the instrument drive device a rotary positive displacement meter.
17. The method of claim 12 , further comprising activating the electronic data device of the corrector instrument to transmit a signal to a location remote from the flow meter, the signal indicating the amount of fluid passing through the flow meter.
18. The method of claim 17 , wherein mounting the corrector instrument to the instrument drive device of the flow meter causes the electronic data device to determine the amount of fluid flow through the flow meter both when fluid passes through the flow meter in the first flow direction and when fluid passes through the flow meter in the second opposite flow direction.
19. The method of claim 17 , wherein activating the electronic data device of the corrector instrument causes the electronic data device to wirelessly transmit the signal to a location remote from the flow meter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/418,754 US20090188315A1 (en) | 2007-02-06 | 2009-04-06 | Instruments for flow meters |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/671,846 US7661306B2 (en) | 2007-02-06 | 2007-02-06 | Instruments for flow meters |
US12/418,754 US20090188315A1 (en) | 2007-02-06 | 2009-04-06 | Instruments for flow meters |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/671,846 Division US7661306B2 (en) | 2007-02-06 | 2007-02-06 | Instruments for flow meters |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090188315A1 true US20090188315A1 (en) | 2009-07-30 |
Family
ID=38541925
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/671,846 Expired - Fee Related US7661306B2 (en) | 2007-02-06 | 2007-02-06 | Instruments for flow meters |
US12/418,754 Abandoned US20090188315A1 (en) | 2007-02-06 | 2009-04-06 | Instruments for flow meters |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/671,846 Expired - Fee Related US7661306B2 (en) | 2007-02-06 | 2007-02-06 | Instruments for flow meters |
Country Status (3)
Country | Link |
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US (2) | US7661306B2 (en) |
CA (1) | CA2676733C (en) |
WO (1) | WO2008097315A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI119298B (en) * | 2006-05-12 | 2008-09-30 | Osakeyhtioe Skf Aktiebolag | The oval gear meter |
EP2199757A1 (en) * | 2008-12-22 | 2010-06-23 | Kral AG | Assembly with at least one flow measuring device for fluids |
JP4599454B1 (en) * | 2009-09-07 | 2010-12-15 | 株式会社オーバル | Volumetric gas-liquid two-phase flow meter and multi-phase flow measurement system |
BR112012009449A2 (en) * | 2009-09-25 | 2016-06-14 | Itron Inc | telemetry system |
WO2011041249A1 (en) * | 2009-09-29 | 2011-04-07 | Itron, Inc. | Combined cathodic protection and meter reading monitoring system |
US9510066B2 (en) * | 2009-09-29 | 2016-11-29 | Itron, Inc. | Collection of telemetry data through a meter reading system |
JP5634748B2 (en) | 2010-05-19 | 2014-12-03 | 株式会社エンプラス | Flow counter |
DE102019130387B3 (en) * | 2019-11-11 | 2020-09-10 | Gwf Messsysteme Ag | Counter |
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- 2007-03-08 WO PCT/US2007/063601 patent/WO2008097315A1/en active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
CA2676733C (en) | 2015-10-06 |
US7661306B2 (en) | 2010-02-16 |
US20080184791A1 (en) | 2008-08-07 |
WO2008097315A1 (en) | 2008-08-14 |
CA2676733A1 (en) | 2008-08-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: DRESSER, INC., TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CROTTIE, EDWARD THOMPSON;REEL/FRAME:022607/0962 Effective date: 20090428 Owner name: DRESSER, INC.,TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CROTTIE, EDWARD THOMPSON;REEL/FRAME:022607/0962 Effective date: 20090428 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |