CN104482982A - Method and device for detecting capacity of cryogenic liquid gas storage tank or gas cylinder - Google Patents
Method and device for detecting capacity of cryogenic liquid gas storage tank or gas cylinder Download PDFInfo
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- CN104482982A CN104482982A CN201410834393.6A CN201410834393A CN104482982A CN 104482982 A CN104482982 A CN 104482982A CN 201410834393 A CN201410834393 A CN 201410834393A CN 104482982 A CN104482982 A CN 104482982A
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- storage tank
- gas cylinder
- cryogenic liquid
- gas storage
- liquid gas
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Abstract
The invention provides a method and device for detecting the capacity of a cryogenic liquid gas storage tank or gas cylinder. According to the method and the device, strain type sensors are mounted outside the cryogenic liquid gas storage tank or gas cylinder, and a terminal instrument for displaying the capacity is connected with the sensors, so that the detection on the capacity of the cryogenic liquid gas storage tank or gas cylinder is realized; a measured stress value is converted into a corresponding actual volume value through a nonlinear equation and is displayed through the terminal instrument, the detecting accuracy is better than that of an embedded capacitive liquid level meter, and the sensors are mounted outside a tank body, so that repair can be realized, and the repairing and maintaining costs are low.
Description
Technical field
The invention belongs to industrial application, relate to a kind of method and apparatus detecting cryogenic liquid gas storage tank or gas cylinder capacity.
Background technology
Common machinery and the embedded detection mode of electrical type cannot realize the detection of gas cylinder or gas tank capacity, current detection cryogenic liquid gas storage tank or gas cylinder capacity adopt capacitive liquid level gauge to measure, the liquid level of fuel is by scale and numerical monitor, storing temperature due to cryogenic liquid gas fuel is low temperature environment, and the transducing part of capacitance level gauge is directly inserted in bottle or in in-tank fuel, ultralow temperature time length can make sensor failure, very easily damage or show inaccurate, metrical error is large, in addition, due to the singularity that liquid level gauge is installed, the liquid level gauge installed needs repairing unique method exactly by gas cylinder or storage tank is whole changes, inconvenient maintenance, take a lot of work, time-consuming, cost is very high.
Summary of the invention
The object of the invention is to propose a kind of method and apparatus detecting cryogenic liquid gas storage tank or gas cylinder capacity, implement convenient, metrical error precision is high, maintenance and maintenance cost low.
For achieving the above object, the present invention by the following technical solutions:
Detect a method for cryogenic liquid gas storage tank or gas cylinder capacity, comprise the following steps:
(1) at cryogenic liquid gas storage tank or gas cylinder outside, strain gauge transducer is installed, the end instrument (4) of the capacity of display is connected with strain gauge transducer;
(2) convert the stress value simulating signal that strain gauge transducer is measured to digital signal, use the mode of nonlinear fitting to change the data of collection, nonlinear equation is shown in formula (1-1):
y＝ax
2+bx+c (1-1)
Wherein y represents bulking value, and stress value is measured in x representative, and a, b, c represent definite value parameter, are drawn by the measured value correction of volume and weight;
By the stress value x that nonlinear equation will be measured, be converted into corresponding actual volume value y; The final actual volume demonstrating cryogenic liquid gas storage tank or gas cylinder fuel on end instrument, or be converted to weight or residual capacity percentage composition A shows;
Wherein y1 represents nominal volume, and y2 represents actual volume.
Further, the real-time quality of cryogenic liquid gas storage tank or gas cylinder fuel is demonstrated after drift value correction being carried out to the actual mass calculated in described step (2) in real time;
Drift value correction step is as follows:
If the weight change amount of cryogenic liquid gas storage tank or gas cylinder is Δ in the unit interval
g;
The output shift amount of unit interval inner sensor is Δ
w, this parameter is definite value, and the type of sensor is different, corresponding Δ
wvalue is different;
If Δ
g> Δ
w, be then judged to be that cryogenic liquid gas storage tank or gas cylinder are in using state, the current display registration of real-time update, the actual mass being about to calculate deducts Δ
gshow as current registration;
If Δ
g< Δ
w, be then judged to be that cryogenic liquid gas storage tank or gas cylinder remain static, the actual mass calculated added Δ
gshow as current registration.
Further, described end instrument is preset with the interface of pressure transducer, preventing gas leak sensor.
Further, described strain gauge transducer is resistance strain type sensor, resistance-strain type digital sensor, capacitance type sensor, voltage-type sensor or fiber Bragg grating type sensor.
Further, only single or many strain gauge transducers are installed in cryogenic liquid gas storage tank or gas cylinder outside.
A kind of device detecting cryogenic liquid gas storage tank or gas cylinder capacity, comprise 4 strain gauge transducers being arranged on the base of frame supporting cryogenic liquid gas storage tank or gas cylinder, framework is provided with the end instrument for the capacity of display, instrument is connected with 4 strain gauge transducers the quality showing gas cylinder.
The present invention detects the method for cryogenic liquid gas storage tank or gas cylinder capacity, the present invention detects the stress of gas cylinder or gas tank by the strain gauge transducer being arranged on cryogenic liquid gas storage tank or gas cylinder outside, by nonlinear equation, the stress value of measurement is converted into corresponding actual volume value, shown by end instrument, accuracy of detection is better than the liquid level gauge of embedded capacitance formula, sensor is arranged on tank body outside, can realize maintenance, maintenance and maintenance cost low.
Further, the present invention has drift value correction step, automatically can judge that the change of sensor signal is signal intensity because the drift of sensor self causes or the sensor signal change caused under any service condition due to cryogenic liquid gas storage tank or gas cylinder fuel, and final auto-compensation falls the drift value of sensor its own signal, thus demonstrating cryogenic liquid gas storage tank or gas cylinder inner capacities information in real time, testing result is more accurate, precision is higher.
Further, the sensor signal input of end instrument other type compatible of the capacity of display, and be preset with corresponding interface, as pressure transducer, preventing gas leak sensor etc., thus the terminal realizing several data information is integrated, has stronger compatibility.
Accompanying drawing explanation
Fig. 1 is structural design front view of the present invention.
Fig. 2 is the upward view of Fig. 1.
Fig. 3 is the right view of Fig. 1.
Fig. 4 is overall three-dimensional structure schematic diagram.
Embodiment
Below the present invention is described in further details.
Detect a method for cryogenic liquid gas storage tank or gas cylinder capacity, comprise the following steps:
(1) at cryogenic liquid gas storage tank or gas cylinder outside, strain gauge transducer is installed, the end instrument (4) of the capacity of display is connected with strain gauge transducer;
(2) convert the stress value simulating signal that strain gauge transducer is measured to digital signal, use the mode of nonlinear fitting to change the data of collection, nonlinear equation is shown in formula (1-1):
y＝ax
2+bx+c (1-1)
Wherein y represents bulking value, and stress value is measured in x representative, and a, b, c represent definite value parameter, are drawn by the measured value correction of volume and weight;
By the stress value x that nonlinear equation will be measured, be converted into corresponding actual volume value y; The final actual volume demonstrating cryogenic liquid gas storage tank or gas cylinder fuel on end instrument, or be converted to weight or residual capacity percentage composition A shows;
Wherein y1 represents nominal volume, and y2 represents actual volume.
The method accuracy of detection of this kind of detection cryogenic liquid gas storage tank or gas cylinder capacity is better than the liquid level gauge of embedded capacitance formula, and can realize maintenance, easy to maintenance, maintenance cost is low.
Further, the real-time quality of cryogenic liquid gas storage tank or gas cylinder fuel is demonstrated after drift value correction being carried out to the actual mass calculated in described step (2) in real time;
Drift value correction step is as follows:
If the weight change amount of cryogenic liquid gas storage tank or gas cylinder is Δ in the unit interval
g;
The output shift amount of unit interval inner sensor is Δ
w, this parameter is definite value, and the type of sensor is different, corresponding Δ
wvalue is different;
If Δ
g> Δ
w, be then judged to be that cryogenic liquid gas storage tank or gas cylinder are in using state, the current display registration of real-time update, the actual mass being about to calculate deducts Δ
gshow as current registration;
If Δ
g< Δ
w, be then judged to be that cryogenic liquid gas storage tank or gas cylinder remain static, the actual mass calculated added Δ
gshow as current registration.
A kind of device detecting cryogenic liquid gas storage tank or gas cylinder capacity, comprise 4 strain gauge transducers be arranged on bottom the framework 2 supporting cryogenic liquid gas storage tank or gas cylinder, framework 2 is provided with the end instrument 4 for the capacity of display, instrument is connected with 4 strain gauge transducers the quality showing gas cylinder; Described end instrument is preset with the interface of pressure transducer, preventing gas leak sensor; Described strain gauge transducer is resistance strain type sensor, resistance-strain type digital sensor, capacitance type sensor, voltage-type sensor or fiber Bragg grating type sensor.
Embodiment, for certain model horizontal industrial LNG gas cylinder capacity check, original use embedded capacitance formula liquid level gauge product detects, need capacitance level gauge assembling between LNG gas cylinder processing period as in the internal cavity of gas cylinder, once liquid level gauge breaks down, entirety needs to change by this LNG gas cylinder, cost intensive, and capacitance level gauge measuring accuracy error is large, settlement steps to deal is as follows:
As Figure 1-4, horizontal industrial LNG gas cylinder is made up of the framework 2 of the gas cylinder 1 and support gas cylinder of storing LNG fuel, in the base of frame of horizontal industrial LNG gas cylinder, 4 precision resister strain gauge transducer-the first strain gauge transducer 3-1 are installed, second strain gauge transducer 3-2, 3rd strain gauge transducer 3-3, 4th strain gauge transducer 3-4, these 4 resistance strain type sensors measure the weight of seamless cylinder, connect with a kind of end instrument 4 of the capacity of display, the end instrument of this capacity of display is by the collection to sensor input signal, conversion and process, finally demonstrate the weight and volume information of residual fuel in LNG industrial gas cylinder, the detection of LNG gas cylinder capacity is reached with this.
This product in maintenance and maintenance, if during any sensor experiences failure of precision resister strain gauge transducer, independent dismounting, maintenance and replacing can be carried out to it; If the end instrument of the capacity of display breaks down, can carry out independent dismounting, maintenance and replacing to it, all dismountings more than carried out, maintenance and Renewal process all can not cause change to the structure of gas cylinder.
This product in compatible, by the connection of instrument and pressure transducer or preventing gas leak sensor, realizes the monitoring to secure contexts such as gas cylinder internal gaseous tension and gas cylinder anti-leaks.
Claims (6)
1. detect a method for cryogenic liquid gas storage tank or gas cylinder, it is characterized in that comprising the following steps:
(1) at cryogenic liquid gas storage tank or gas cylinder outside, strain gauge transducer is installed, the end instrument (4) of the capacity of display is connected with strain gauge transducer;
(2) convert the stress value simulating signal that strain gauge transducer is measured to digital signal, use the mode of nonlinear fitting to change the data of collection, nonlinear equation is shown in formula (1-1):
y＝ax
2+bx+c (1-1)
Wherein y represents bulking value, and stress value is measured in x representative, and a, b, c represent definite value parameter, are drawn by the measured value correction of volume and weight;
By the stress value x that nonlinear equation will be measured, be converted into corresponding actual volume value y; The final actual volume demonstrating cryogenic liquid gas storage tank or gas cylinder fuel on end instrument, or be converted to weight or residual capacity percentage composition A shows;
Wherein y1 represents nominal volume, and y2 represents actual volume.
2. the method for detection cryogenic liquid gas storage tank according to claim 1 or gas cylinder capacity, is characterized in that: the real-time quality demonstrating cryogenic liquid gas storage tank or gas cylinder fuel after carrying out drift value correction to the actual mass calculated in described step (2) in real time;
Drift value correction step is as follows:
If the weight change amount of cryogenic liquid gas storage tank or gas cylinder is Δ in the unit interval
g;
The output shift amount of unit interval inner sensor is Δ
w, this parameter is definite value, and the type of sensor is different, corresponding Δ
wvalue is different;
If Δ
g> Δ
w, be then judged to be that cryogenic liquid gas storage tank or gas cylinder are in using state, the current display registration of real-time update, the actual mass being about to calculate deducts Δ
gshow as current registration;
If Δ
g< Δ
w, be then judged to be that cryogenic liquid gas storage tank or gas cylinder remain static, the actual mass calculated added Δ
gshow as current registration.
3. the method for detection cryogenic liquid gas storage tank according to claim 1 or gas cylinder capacity, is characterized in that: described end instrument is preset with the interface of pressure transducer, preventing gas leak sensor.
4. the method for detection cryogenic liquid gas storage tank according to claim 1 or gas cylinder capacity, is characterized in that: described strain gauge transducer is resistance strain type sensor, resistance-strain type digital sensor, capacitance type sensor, voltage-type sensor or fiber Bragg grating type sensor.
5. the method for detection cryogenic liquid gas storage tank according to claim 1 or gas cylinder capacity, is characterized in that: only single or many strain gauge transducers are installed in cryogenic liquid gas storage tank or gas cylinder outside.
6. one kind is detected the device of cryogenic liquid gas storage tank or gas cylinder capacity, it is characterized in that: comprise 4 strain gauge transducers being arranged on framework (2) bottom supporting cryogenic liquid gas storage tank or gas cylinder, framework (2) is provided with the end instrument (4) for the capacity of display, instrument is connected with 4 strain gauge transducers the quality showing gas cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410834393.6A CN104482982A (en) | 2014-12-27 | 2014-12-27 | Method and device for detecting capacity of cryogenic liquid gas storage tank or gas cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410834393.6A CN104482982A (en) | 2014-12-27 | 2014-12-27 | Method and device for detecting capacity of cryogenic liquid gas storage tank or gas cylinder |
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|---|---|
| CN104482982A true CN104482982A (en) | 2015-04-01 |
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| CN201410834393.6A Pending CN104482982A (en) | 2014-12-27 | 2014-12-27 | Method and device for detecting capacity of cryogenic liquid gas storage tank or gas cylinder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969809A (en) * | 2017-04-10 | 2017-07-21 | 中国石油大学(华东) | A kind of vehicle-mounted LNG bottles of liquid-level detecting methods and device |
| CN113252462A (en) * | 2021-06-07 | 2021-08-13 | 潍柴动力股份有限公司 | Method and system for detecting gas cylinder and readable storage medium |
| CN113916323A (en) * | 2021-09-10 | 2022-01-11 | 深圳伊讯科技有限公司 | Oil storage tank optic fibre liquid level intelligent monitoring system |
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| US20040204870A1 (en) * | 2001-02-02 | 2004-10-14 | Schimnowski Kenneth R. | Fuel tank level monitoring system and method |
| CN201476841U (en) * | 2009-09-03 | 2010-05-19 | 浙江美通机械制造有限公司 | Weighing metering liquid level display device arranged on asphalt reaction kettle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106969809A (en) * | 2017-04-10 | 2017-07-21 | 中国石油大学(华东) | A kind of vehicle-mounted LNG bottles of liquid-level detecting methods and device |
| CN113252462A (en) * | 2021-06-07 | 2021-08-13 | 潍柴动力股份有限公司 | Method and system for detecting gas cylinder and readable storage medium |
| CN113916323A (en) * | 2021-09-10 | 2022-01-11 | 深圳伊讯科技有限公司 | Oil storage tank optic fibre liquid level intelligent monitoring system |
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