CN100545539C - Chocked-flow type safety electric water heating device - Google Patents
Chocked-flow type safety electric water heating device Download PDFInfo
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- CN100545539C CN100545539C CNB2006100385758A CN200610038575A CN100545539C CN 100545539 C CN100545539 C CN 100545539C CN B2006100385758 A CNB2006100385758 A CN B2006100385758A CN 200610038575 A CN200610038575 A CN 200610038575A CN 100545539 C CN100545539 C CN 100545539C
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- choked flow
- performer
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- heating device
- chocked
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Abstract
The present invention relates to a kind of improvement of electric heater safety device, belong to household electrical appliance technical field.Electric heater of the present invention comprises the inner bag that is shaped on entery and delivery port, electric heating device is housed in the inner bag, also comprise choked flow supervisory circuit and choked flow performer, the metal parts that the sampling end of described choked flow supervisory circuit connects ground wire and/or contacts with water, its signal output part are access to the choked flow performer that is placed in water into or the outlet pipeline.In case abnormal conditions appear in the ground wire of electric heater, sampled signal in the choked flow supervisory circuit changes, thereby direct or indirect actuate actuators part, change the water outlet current of electric heater rapidly, eliminate safe hidden trouble, guarantee user's safety, the abrupt potential of current must cause user's vigilance simultaneously, plays reliable warning effect.
Description
Technical field
The present invention relates to a kind of electric heater, especially a kind of improvement of electric heater safety device belongs to household electrical appliance technical field.
Background technology
As everyone knows, the basic structure of electric heater be settle in the shell bring into, the inner bag of delivery port, electric heating device is housed in the inner bag.During use, the electric heating device energising is heated to predetermined temperature with the water storage in the inner bag, thereby provides required hot water to the user.Since electric heater was born, its security performance was the problem that producer and user extremely pay close attention to always.
The associated safety measure that early stage electric heater is taked be unable to do without " earth leakage protective " notion basically, promptly is connected to the protection device of detection of electrical leakage function in control circuit, and behind the leakage current overrate of water heater, leakage switch is cut off the electricity supply automatically.This type of safety measure can only solve the problem of phase line electric leakage, when local wire loop border is relatively poor, still has potential safety hazard.
Eighties of last century is not after 962431206 Chinese patent application has at first proposed to utilize the notion of water resistance as insulating materials itself from application number, and the safety of ground wire has been had certain protection.The notion of " water resistance itself is as insulating materials " is, because running water itself has dielectric resistance, therefore as long as the electric heater inlet tube and outlet tube adopts insulating materials to make, and its draw ratio reaches certain ratio (for example pipe range greater than 14 times caliber square), even then the ground wire that uses of electric heater occurs when unusual, because the iris action of water resistance, delivery port can be reduced to safe voltage.What occur thereafter all is according to above-mentioned notion such as many patents such as 012620629,011353007,02114552,032312644,2003201938037, the local improvement of the variety of way that inner container of electric water heater water-in and water-out structure is carried out.
Yet the person who is ambitious or tenacious of purpose finds that in fact, also there are some drawbacks in the safety measure of utilizing " water resistance " to take:
1), realizes that the lengthening inlet tube and outlet tube that " water resistance isolation " adopted certainly will increase resistance to water-flow, having sacrificed the original discharge performance of electric heater (detects and finds, under equal hydraulic pressure situation, adopt the flow of " water resistance isolation " electric heater to lose more than 20%);
2), " water resistance isolation " fail to allow the user in time know unusually, the inreal potential safety hazard of cutting off;
3), particularly serious be, when plastic insulating tube occurred leaking owing to reason such as aging, " water resistance isolation " with destroyed, and be not easy to be found, the user will be below unwitting situation the full hidden danger in Linan.
Summary of the invention
The technical problem that will solve of the present invention is: at the problem that above prior art exists, propose a kind of former powerful, Chocked-flow type safety electric water heating device that can fundamentally eliminate safe hidden trouble of water heater that do not influence.
In order to solve above technical problem, the applicant breaks the circle of " water resistance isolation ", through further investigation, explore repeatedly, following Chocked-flow type safety electric water heating device technical solution has been proposed: the present invention includes and have into, the inner bag of delivery port and electric heating device, also comprise choked flow supervisory circuit and choked flow performer, the metal parts that the sampling end of described choked flow supervisory circuit is connected to ground wire and/or contacts with water, its signal output part outputs to the control signal input of choked flow performer by the logic analysis circuit, and described choked flow performer is installed in the water stream channel place.
Like this, in case abnormal conditions appear in the ground wire of electric heater, sampled signal on the sampling element changes, thereby by logic analysis rear drive performer, the water outlet current of blocking-up electric heater eliminate safe hidden trouble rapidly, guarantee user's safety, the abrupt potential of current must cause user's vigilance simultaneously, thereby plays reliable warning effect.
Another kind of solution of the present invention is, Chocked-flow type safety electric water heating device comprises inner bag and the electric heating device with entery and delivery port, also comprise the choked flow performer, the metal parts that the control signal input of described choked flow performer is connected to ground wire and/or contacts with water, described choked flow performer is installed in the water stream channel place.Like this, in case the ground wire of electric heater occurs unusually, by the unusual electric energy actuate actuators part on the ground wire, blocking-up water outlet current eliminate safe hidden trouble with directly.This scheme also is feasible in theory.
Need to prove, in the above scheme in " metal parts that is connected to ground wire and/or contacts " with water, the implication of " connection " comprises direct electrical connection and is of coupled connections, " and/or " implication comprise and be connected to ground wire separately, be connected to metal parts that contacts with water and the various situations that are connected to ground wire and the metal parts that contacts with water simultaneously separately.
Because the present invention when generation is unusual, has cut off leakage path by the blocking-up current, has therefore fundamentally eliminated potential safety hazard.Compare with " water resistance isolation " safety measure, the present invention can be attached on the electric heater, only works when abnormal conditions appear in ground wire, does not therefore influence the performance of electric heater original function.
And, comparing with various prior aries, the present invention need not to establish in addition warning device owing in the blocking-up current assurance safety, play the warning effect naturally, thereby security protection and security alarm are organically combined.Particularly what deserves to be mentioned is, compare that warning of the present invention is not influenced by various factors such as installation site, user's concern power, and is the most reliable with various warning facilities.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of the embodiment of the invention one.
Fig. 2 is the choked flow supervisory circuit schematic diagram of Fig. 1 embodiment.
Fig. 3 is the choked flow supervisory circuit schematic diagram of the embodiment of the invention two.
Fig. 4 is the choked flow supervisory circuit schematic diagram of the embodiment of the invention three.
The specific embodiment
Embodiment one
The Chocked-flow type safety electric water heating device of present embodiment is equipped with inner bag 1 as shown in Figure 1 in the shell 5, the water inlet of inner bag 1 and delivery port are equipped with insulating joint 4 and 3 respectively, in the inner bag 1 electric heating device is housed.Magnetic valve 2 as the choked flow performer is housed on the water outlet insulating joint 3 wherein.
The choked flow supervisory circuit that drives magnetic valve 2 as shown in Figure 2, by as the divider resistance R2 of abnormal voltage signal sampling element and R3, constitute as the comparator A of logic analysis circuit.Wherein, the sampling end of abnormal signal sampling element is connected to ground wire GND (obviously, as the case may be, also can be connected to the metal parts that contacts with water individually or simultaneously), the mid point signal output part of two divider resistance R2 and R3 draws the inverting input of receiving comparator A, draws the signal of receiving comparator A normal phase input end with the in addition two divider resistance R1 of connecting to neutral line N and R4 mid point and compares.Under the normal condition, make the in-phase input end current potential be lower than inverting input by setting resistance, comparator A output low level.When ground wire leaks electricity, the inverting input current potential is reduced to and is lower than normal phase input end, comparator A output high level is to the solenoid control signal input part that is installed in the outlet pipeline place, thereby drive the water outlet current that the valve performer turn-offs electric heater, eliminate safe hidden trouble, guarantee user's safety, cause user's vigilance simultaneously, play the warning effect.
Embodiment two
The basic structure of present embodiment is identical with embodiment one, difference is the choked flow supervisory circuit as shown in Figure 3, be of coupled connections as the mutual inductor a sampling end of abnormal current signal sampling element and ground wire GND and phase line L and zero line N, its signal output part draws the inverting input of receiving comparator A, draws the signal of receiving comparator A normal phase input end with another mutual inductor b that is coupling-connected to phase line L and zero line N and compares.
Its action principle is identical with embodiment one with monitor procedure, does not give unnecessary details in addition.
Embodiment three
The basic structure of present embodiment is also identical with embodiment one.Choked flow supervisory circuit wherein is made up of voltage sampling circuit, comparison circuit, output control circuit and power circuit as shown in Figure 4.
Voltage sampling circuit has two-way, and the first via is by the diode D1 and form as resistance R 2, the R3 of abnormal signal sampling element of connecting between zero-power line and the power supply phase line; Secondary route is connected between power ground and the power supply phase line as the diode D2 of electric leakage sampling element and as resistance R 4, R5, the R6 of contrast signal sampling element to be formed.
Comparison circuit is made up of the LM393 dual comparator, and the sampling resistor mid point V1 of first via sample circuit connects the inverting input of the first comparator A, and (V4 and V1 equipotential) connects the in-phase input end of the second comparator B simultaneously; Mid point V2 connects the in-phase input end of the first comparator A on the sampling resistor of No. the second sample circuit, and following mid point V3 connects the inverting input of the second comparator B; The output in parallel of the output of two comparator A, B meets output control circuit U1.
This output control circuit U1 connects the control signal input of magnetic valve, according to the comparative result output control signal corresponding of comparator A and B, realizes that logical relation sees Table 1 to the relatively execution of judged result of sampled voltage:
| ?A | ?B | Output |
| ?1 | ?1 | ?1 |
| ?0 | ?1 | ?0 |
| ?1 | ?0 | ?0 |
| ?0 | ?0 | ?0 |
The control power circuit is used to provide the working power of comparison circuit, can connect the simple shunt regulating circuit realization that shunt capacitance C1, voltage-stabiliser tube D2 form by series diode D1, resistance R 1, also can be made of the working power circuit of other modes.
During work, by gathering power supply phase line L to zero-power line N and power supply phase line L voltage U 12 (U12=V1-V2) and U34 (U34=V3-V4) to power ground GND, and U12 is input to comparator A, U34 is input to comparator B, and the output state of controlling output control executive component U1 according to the output result of the logical of comparator A and comparator B reaches the purpose of output control.The parameter of sample circuit is selected to make the V2 current potential be higher than the current potential of V1 in normal operation, and promptly the current potential of the in-phase input end of comparator A is higher than inverting input, and phase inverter A exports high level, puts logical one; The V4 current potential is higher than V3, and promptly the current potential of the in-phase input end of comparator B is higher than inverting input, and phase inverter B exports high level, puts logical one; Phase inverter A and phase inverter B logic with the result be high level logic " 1 ";
If power ground GND current potential is because certain reason changes, cause the voltage of power supply phase line L and power ground GND to be lower than the voltage of power supply phase line L and zero-power line N, be that the in-phase input end V2 current potential of phase inverter A is reduced to the inverting input V1 current potential less than phase inverter A, phase inverter A output low level, logical zero, output is controlled to be the logical zero state; Otherwise, power ground GND current potential is because certain reason changes, cause the voltage of power supply phase line L and power ground GND to be higher than the voltage of power supply phase line L and zero-power line N, be that the inverting input V3 current potential of phase inverter B is elevated to the current potential greater than the in-phase input end V4 of phase inverter B, phase inverter B output low level, logical zero, output is controlled to be the logical zero state; In like manner, after changing, the current potential of zero-power line makes the upset of comparator occurrence logic equally, cause the output control circuit output state to change, thereby realize the potential change of monitoring power supply ground wire GND and zero-power line N, and after reaching preset threshold, export the function of control signal.As a result, order about the magnetic valve action, cut off the electric heater current, play the safeguard protection effect, meanwhile, the unexpected variation of current is played watchful effect naturally to the user.
Embodiment four
Present embodiment omits other component (figure slightly) with the direct earth connection of control signal input of magnetic valve among Fig. 2.Ways of connecting can be direct electrical connection, also can be to be of coupled connections.Like this, more direct to the control of choked flow performer, when ground wire leaks electricity, magnetic valve will be driven, and turn-off current, also can play safeguard protection and warning function in theory.
In addition to the implementation, the present invention can also have other embodiments.For example, electric heating device can be built-in, also can be external; For another example, the choked flow performer comprises that also various other electricity by signal of telecommunication control mechanical movement conversion trigger mechanical trip gear except that pilot-operated type, Direct Action Type, various magnetic valves such as rotary; And for example and since the water outlet current of electric heater restricted with the water inlet current, so the choked flow performer both can be installed in the outlet pipeline, also can be installed in the inlet pipeline, or be installed in water stream channel of other restriction water outlet current; Or the like.In addition, all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (12)
1, a kind of Chocked-flow type safety electric water heating device, comprise inner bag and electric heating device with entery and delivery port, it is characterized in that: the choked flow performer that also comprises the choked flow supervisory circuit and be used to block the water outlet current, the metal parts that the sampling end of described choked flow supervisory circuit connects ground wire and/or contacts with water, its signal output part outputs to the control signal input of choked flow performer by the logic analysis circuit, and described choked flow performer is installed in the water stream channel place.
2, according to the described Chocked-flow type safety electric water heating device of claim 1, it is characterized in that: described choked flow supervisory circuit for the voltage signal supervisory circuit of ground wire and/or the electrical connection of the metal parts that contact with water.
3, according to the described Chocked-flow type safety electric water heating device of claim 1, it is characterized in that: the current signal supervisory circuit of described choked flow supervisory circuit for being of coupled connections with ground wire and/or the metal parts that contacts with water.
4, according to the described Chocked-flow type safety electric water heating device of claim 2, it is characterized in that: described voltage signal supervisory circuit is made up of voltage sampling circuit, comparison circuit, output control circuit, the input end grounding line and the reference point of described voltage sampling circuit, the input of the output termination comparison circuit of described voltage sampling circuit, the output of described comparison circuit connect the control signal input of choked flow performer through output control circuit.
5, according to the described Chocked-flow type safety electric water heating device of claim 3, it is characterized in that: described current signal supervisory circuit is made up of current sampling circuit, comparison circuit, output control circuit, the input of described current sampling circuit is coupling-connected to ground wire and reference point, the input of the output termination comparison circuit of described current sampling circuit, the output of described comparison circuit connect the control signal input of choked flow performer through output control circuit.
6, according to claim 4 or 5 described Chocked-flow type safety electric water heating devices, it is characterized in that: described choked flow performer is a signal of telecommunication driving element.
7, according to the described Chocked-flow type safety electric water heating device of claim 6, it is characterized in that: described signal of telecommunication driving element is that magnetic valve or electricity trigger mechanical trip gear.
8, a kind of Chocked-flow type safety electric water heating device, comprise inner bag and electric heating device with entery and delivery port, it is characterized in that: also comprise the choked flow performer that is used to block the water outlet current, the metal parts that the control signal input of described choked flow performer is connected to ground wire and/or contacts with water, described choked flow performer is installed in the water stream channel place.
9, described according to Claim 8 Chocked-flow type safety electric water heating device is characterized in that: the metal parts that the control signal input of described choked flow performer is electrically connected to ground wire and/or contacts with water.
10, described according to Claim 8 Chocked-flow type safety electric water heating device is characterized in that: the metal parts that the control signal input of described choked flow performer is coupling-connected to ground wire and/or contacts with water.
11, according to claim 9 or 10 described Chocked-flow type safety electric water heating devices, it is characterized in that: described choked flow performer is a signal of telecommunication driving element.
12, according to the described Chocked-flow type safety electric water heating device of claim 11, it is characterized in that: described signal of telecommunication driving element is that magnetic valve or electricity trigger mechanical trip gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100385758A CN100545539C (en) | 2006-02-28 | 2006-03-02 | Chocked-flow type safety electric water heating device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610038535 | 2006-02-28 | ||
| CN200610038535.1 | 2006-02-28 | ||
| CNB2006100385758A CN100545539C (en) | 2006-02-28 | 2006-03-02 | Chocked-flow type safety electric water heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1920438A CN1920438A (en) | 2007-02-28 |
| CN100545539C true CN100545539C (en) | 2009-09-30 |
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ID=37778218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100385758A Expired - Fee Related CN100545539C (en) | 2006-02-28 | 2006-03-02 | Chocked-flow type safety electric water heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100545539C (en) |
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2006
- 2006-03-02 CN CNB2006100385758A patent/CN100545539C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1920438A (en) | 2007-02-28 |
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Granted publication date: 20090930 Termination date: 20100302 |