CN103123011A - Self-suction electromagnetic valve driving device of forced-ventilated gas water heater - Google Patents

Self-suction electromagnetic valve driving device of forced-ventilated gas water heater Download PDF

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Publication number
CN103123011A
CN103123011A CN2012103796288A CN201210379628A CN103123011A CN 103123011 A CN103123011 A CN 103123011A CN 2012103796288 A CN2012103796288 A CN 2012103796288A CN 201210379628 A CN201210379628 A CN 201210379628A CN 103123011 A CN103123011 A CN 103123011A
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solenoid valve
resistance
triode
controller
circuit
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CN2012103796288A
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CN103123011B (en
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黄启均
李国星
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Zhongshan Vatti Gas Appliance Co Ltd
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Zhongshan Vatti Gas Appliance Co Ltd
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Abstract

The invention discloses a self-priming electromagnetic valve driving device of a forced-ventilated gas water heater, which comprises a controller, an electromagnetic valve, a wind pressure switch and a temperature controller switch, wherein the common end of the electromagnetic valve is connected with one end of a power supply through the temperature controller switch, one end of the wind pressure switch is connected with the other end of the power supply, a wind pressure switch detection circuit is connected between the other end of the wind pressure switch and the controller, the controller is connected with a strong suction coil driving circuit and a holding coil driving circuit which are used for driving the electromagnetic valve, and an electromagnetic valve driving circuit detection circuit which is used for detecting the level of the output ends of the strong suction coil driving circuit and the holding coil driving circuit, the power end of the strong suction coil driving circuit is connected with the power supply through the wind pressure switch, and the detection end of the electromagnetic valve. The driving device has the advantages that the driving device can effectively prevent the electromagnetic valve from being out of control due to the failure of the controller, the failure of the driving pipe or the failure caused by high temperature, and avoid potential safety hazards.

Description

A kind of Self-attracting solenoid valve drive unit of forced exhausting gas water heater
[technical field]
The present invention relates to a kind of Self-attracting solenoid valve drive unit of forced exhausting gas water heater, belong to electricity field.
[background technique]
At present, the ordinary strong exhaust gas water-heater adopts MCU directly to drive the strong suction coil of self-suction type electromagnetic valve and the break-make that keeping coil is controlled combustion gas usually, and it has following shortcoming:
1, when MCU breaks down, inhaling by force coil might be energized, and solenoid valve can be opened extremely, is in runaway condition.
2, break down when breakdown when driving the strong driving tube of inhaling coil, solenoid valve also might be opened extremely, is in runaway condition.
3, break down when breakdown when the driving tube that drives keeping coil, in case after inhaling coil electricity by force, solenoid valve can't cut out, the break-make of combustion gas is in runaway condition, easily leads to security incident.
In order to overcome defects and driving circuit for electromagnetic valve to be improved, I design following technological scheme.
[summary of the invention]
The present invention has overcome the deficiency of above-mentioned technology, a kind of Self-attracting solenoid valve drive unit of forced exhausting gas water heater is provided, can effectively prevent because controller breaks down, driving tube fault or high temperature cause that fault causes solenoid valve generation out of control, avoids producing potential safety hazard by this drive unit.
For achieving the above object, the present invention has adopted following technical proposal:
a kind of Self-attracting solenoid valve drive unit of forced exhausting gas water heater, include controller 1, solenoid valve T2, blast switch S3, and temperature controller switch S4, described solenoid valve T2 coil is provided with solenoid valve and inhales by force end 21, solenoid valve is kept end 22 and solenoid valve common port 23, described solenoid valve common port 23 connects power supply one end by temperature controller switch S4, described blast switch S3 one end is connected with the power supply the other end, be connected with blast switch testing circuit 7 between the blast switch S3 the other end and controller 1, described controller 1 and solenoid valve are inhaled by force and are connected with between end 21 for the strong suction coil driver 5 that drives solenoid valve T2 adhesive, described strong suction coil driver 5 power ends are connected with power supply by blast switch S3, described controller 1 and solenoid valve are kept between end 22 and are connected be used to the keeping coil drive circuit 6 of keeping solenoid valve T2 attracting state, described drive unit also includes the driving circuit for electromagnetic valve testing circuit 8 of inhaling coil driver 5 and keeping coil drive circuit 6 output terminal level for detection of strong, the test end of described driving circuit for electromagnetic valve testing circuit 8 is kept end 22 with solenoid valve and is connected, driving circuit for electromagnetic valve testing circuit 8 output terminals are connected with controller 1.
Controller 1 as above also is connected with blower fan 10.
described strong suction coil driver 5 includes capacitor C 5, resistance R 51, resistance R 52, PNP triode Q1, NPN triode Q3, and diode D3, described capacitor C 5 one ends are connected with controller 1 as the strong coil driver 5 control signal input ends of inhaling, capacitor C 5 the other ends are connected with triode Q3 base stage by resistance R 52, triode Q3 grounded-emitter connection, triode Q3 collector electrode is connected with triode Q1 base stage by resistance R 51, triode Q1 emitter is connected with positive source by blast switch S3, triode Q1 collector electrode is inhaled by force end 21 as strong suction coil driver 5 control signal output terminals and solenoid valve, diode D3 negative pole connects, diode D3 plus earth.
Described keeping coil drive circuit 6 includes capacitor C 2, resistance R 61, resistance R 62, PNP triode Q2, described capacitor C 2 one ends are connected with controller 1 as keeping coil drive circuit 6 control signal input ends, capacitor C 2 the other ends are connected with triode Q2 base stage, triode Q2 emitter is connected with power supply, described resistance R 62 is connected between power supply and triode Q2 base stage, and triode Q2 collector electrode is kept end 22 as keeping coil drive circuit 6 output terminals and solenoid valve and is connected.
Described keeping coil drive circuit 6 power ends are connected with power supply by blast switch S3.
Described blast switch testing circuit 7 includes resistance R 71 and resistance R 72, described resistance R 71 1 ends are connected with positive source by blast switch S3, resistance R 71 the other ends are connected with controller 1, resistance R 72 1 ends as the testing signal output terminal, resistance R 72 the other end ground connection.
Described driving circuit for electromagnetic valve testing circuit 8 includes diode D4, resistance R 81, resistance R 82, NPN triode Q4 and capacitor C 7, described diode D4 positive pole is kept end 22 as driving circuit for electromagnetic valve testing circuit 8 testing signal input ends and solenoid valve and is connected, diode D4 negative pole is connected with resistance R 81 1 ends, capacitor C 7 one ends, resistance R 81 the other ends are connected with triode Q4 base stage, triode Q4 collector electrode is connected with controller 1, resistance R 82 1 ends, ground connection after resistance R 82 another termination positive sources, capacitor C 7 the other ends are connected with triode Q4 emitter.
The invention has the beneficial effects as follows:
1, realize the cold protection of system by blast switch; system is when standby; blower fan does not start, and blower fan is in closed condition, and blast switch is in off state; make strong suction coil driver and power supply disconnect; at this moment no matter controller breaks down or inhaling by force the coil driver driving tube breaks down, and electric current is provided all can't for the strong coil of inhaling, and solenoid valve also just can't adhesive; the passage of combustion gas is in off state, belongs to safe condition.
2, realize the heat protection function of system by temperature controller switch; when water heater enters normal combustion; when in case high temperature occurring; temperature controller switch can disconnect; the coil of solenoid valve all is disconnected and being connected of power cathode; solenoid valve meeting auto-closing, blast tube is in off state, belongs to safe condition.
3, the strong suction pulse signal of controller output is by the strong combination switch of inhaling on coil driver, control the strong coil adhesive solenoid valve of inhaling, in case controlling pin, controller lost efficacy, this signal can be in a kind of level always, and last electric current releases by the combination switch that two triodes form, and finally inhales by force with solenoid valve and holds the driving tube that is connected to be in cut-off state, the strong coil of inhaling passes through without enough electric currents, can't the adhesive solenoid valve, blast tube is in off state like this, belongs to safe condition.
4, the pulse signal of keeping of controller output is controlled the conducting of driving tube on the keeping coil drive circuit by condenser coupling, control solenoid valve and keep the electric current of end, in case controlling pin, controller lost efficacy, this signal can be in a kind of level always, last electric capacity one end all can charge by resistance, the base stage that finally causes driving tube is high level, thereby driving tube is in cut-off state, solenoid valve is kept end and is passed through without enough electric currents, can't keep solenoid valve, solenoid valve closes again, and blast tube is in off state like this, belongs to safe condition.
5, detect the state of blast switch by the blast switch testing circuit, after blast switch triggered, controller carried out subsequent control.
6, system is at holding state, after blast switch triggers and switches on power, the driving circuit for electromagnetic valve testing circuit detects the strong output state of coil driver, the output state of keeping coil drive circuit inhaled, if solenoid valve being detected, to keep the level signal of end be high level, namely have driving tube breakdown, controller enters lock state and outwards reports to the police.
In case 7 driving tubes are breakdown, namely the driving circuit for electromagnetic valve testing circuit detects solenoid valve and keeps end for high level signal, and system is judged as fault.If the driving tube of inhaling by force on coil driver is breakdown, controller stops output and drives control impuls, and electric current is not kept in keeping coil drive circuit driving tube cut-off like this on keeping coil, and solenoid valve closes again, and system enters lock state; If the driving tube on the keeping coil drive circuit is breakdown, same, controller stops output and drives control impuls, when being heated to uniform temperature, temperature controller switch is triggered and is disconnected, and electromagnetic valve coil does not have electric current to flow through, solenoid valve closes again, and system enters lock state.
8, also connect the situation of power supply by blast switch at the keeping coil drive circuit, i.e. the power supply of keeping coil drive circuit also is subjected to the control of blast switch.
[description of drawings]
Fig. 1 is structural representation of the present invention.
Fig. 2 is that keeping coil drive circuit power end of the present invention connects the structural representation of power supply by blast switch.
Fig. 3 is the circuit theory diagrams of Fig. 1.
Fig. 4 is the circuit theory diagrams of Fig. 2.
[embodiment]
Be described in further detail below in conjunction with accompanying drawing and embodiments of the present invention:
as shown in Figure 1, a kind of Self-attracting solenoid valve drive unit of forced exhausting gas water heater, include controller 1, solenoid valve T2, blast switch S3, and temperature controller switch S4, described solenoid valve T2 coil is provided with solenoid valve and inhales by force end 21, solenoid valve is kept end 22 and solenoid valve common port 23, it is anodal that described solenoid valve common port 23 connects electricity by temperature controller switch S4, described blast switch S3 one end is connected with power cathode, be connected with blast switch testing circuit 7 between the blast switch S3 the other end and controller 1, described controller 1 and solenoid valve are inhaled by force and are connected with between end 21 for the strong suction coil driver 5 that drives solenoid valve T2 adhesive, described strong suction coil driver 5 power ends are connected with positive source by blast switch S3, described controller 1 and solenoid valve are kept between end 22 and are connected be used to the keeping coil drive circuit 6 of keeping solenoid valve T2 attracting state, described drive unit also includes the driving circuit for electromagnetic valve testing circuit 8 of inhaling coil driver 5 and keeping coil drive circuit 6 output terminal level for detection of strong, the test end of described driving circuit for electromagnetic valve testing circuit 8 is kept end 22 with solenoid valve and is connected, driving circuit for electromagnetic valve testing circuit 8 output terminals are connected with controller 1.
Controller 1 as above also is connected with blower fan 10.
In the present invention, as shown in Fig. 1,3, described keeping coil drive circuit 6 power ends can directly be connected with positive source, as shown in Fig. 2,4, described keeping coil drive circuit 6 power ends are connected with positive source by blast switch S3, namely also by blast switch S3, keeping coil drive circuit 6 are carried out power supply and control.
As shown in Figure 1, 2, described power supply, blast switch S3, inhale coil driver 5, solenoid valve by force and inhale by force the adhesive loop that end 21, solenoid valve common port 23 and temperature controller switch S4 have formed solenoid valve T2, controller 1 inhales by strong the adhesive that coil driver 5 is controlled solenoid valve T2.
As shown in Figure 1, described power supply, keeping coil drive circuit 6, solenoid valve are kept the attracting state that end 22, solenoid valve common port 23 and temperature controller switch S4 formed solenoid valve T2 and are kept the loop, and controller 1 is controlled keeping of solenoid valve T2 states by keeping coil drive circuit 6.
As shown in Figure 2, described power supply, blast switch S3, keeping coil drive circuit 6, solenoid valve are kept the state that end 22, solenoid valve common port 23 and temperature controller switch S4 formed solenoid valve T2 and are kept the loop, and controller 1 is controlled keeping of solenoid valve T2 states by keeping coil drive circuit 6.
as Fig. 3, shown in 4, described strong suction coil driver 5 includes capacitor C 5, resistance R 51, resistance R 52, PNP triode Q1, NPN triode Q3, and diode D3, described capacitor C 5 one ends are connected with controller 1 as the strong coil driver 5 control signal input ends of inhaling, capacitor C 5 the other ends are connected with triode Q3 base stage by resistance R 52, triode Q3 grounded-emitter connection, triode Q3 collector electrode is connected with triode Q1 base stage by resistance R 51, triode Q1 emitter is connected with positive source by blast switch S3, triode Q1 collector electrode is inhaled by force end 21 as strong suction coil driver 5 control signal output terminals and solenoid valve, diode D3 negative pole connects, diode D3 plus earth.
Strong suction coil driver 5 as above receives the pulse signal of controller 1 output by capacitor C 5, pulse signal controls by capacitor C 5 couplings the composite switch circuit that is comprised of triode Q3 and triode Q1, thereby controls the strong coil 21 adhesive solenoid valve T2 that inhale.In case controlling pin, controller 1 lost efficacy, this signal can be in a kind of level always, the electric charge of last capacitor C 5 the other ends all can release by the emitter of resistance R 52 and triode Q3, finally cause the base stage of triode Q3 to be in low level, triode Q3 can be in cut-off state, thereby triode Q1 also can be in cut-off state, solenoid valve is inhaled by force end 21 and is passed through without enough electric currents, can't adhesive solenoid valve T2, blast tube is in off state like this, belongs to safe condition.
As shown in Figure 3, described keeping coil drive circuit 6 includes capacitor C 2, resistance R 61, resistance R 62, PNP triode Q2, described capacitor C 2 one ends are connected with controller 1 as keeping coil drive circuit 6 control signal input ends, capacitor C 2 the other ends are connected with triode Q2 base stage, triode Q2 emitter is connected with power supply, described resistance R 62 is connected between power supply and triode Q2 base stage, and triode Q2 collector electrode is kept end 22 as keeping coil drive circuit 6 output terminals and solenoid valve and is connected.
As shown in Figure 4, described keeping coil drive circuit 6 power ends are connected with positive source by blast switch S3, realize the triggering power supply of blast switch S3.
Keeping coil drive circuit 6 as above receives the pulse signal of controller 1 output by capacitor C 2, pulse signal is controlled triode Q2 switching circuit by capacitor C 2 couplings.Controller 1 is controlled pin and was lost efficacy, this signal can be in a kind of level always, last capacitor C 2 one ends all can charge by resistance R 62, resistance R 61, the base stage that finally causes triode Q2 is high level, thereby triode Q2 can be in cut-off state, can't adhesive solenoid valve T2, blast tube is in off state like this, belongs to safe condition.
As shown in Fig. 3,4, the testing circuit of blast switch described in the present invention 7 includes resistance R 71 and resistance R 72, described resistance R 71 1 ends are connected with positive source by blast switch S3, resistance R 71 the other ends are connected with controller 1, resistance R 72 1 ends as the testing signal output terminal, resistance R 72 the other end ground connection.
When water heater as above starts from holding state, first start the blower fan 10 on water heater, blast switch S3 is subject to triggering and connects, strong suction coil driver 5, keeping coil drive circuit 6 switch on power, blast switch testing circuit 7 detects fan switch S3 and is triggered, output signal to controller 1, controller 1 is carried out subsequent control.
as Fig. 3, shown in 4, the testing circuit 8 of driving circuit for electromagnetic valve described in the present invention is kept the level of end 22 for detection of solenoid valve, it includes diode D4, resistance R 81, resistance R 82, NPN triode Q4, and capacitor C 7, described diode D4 positive pole is kept end 22 as driving circuit for electromagnetic valve testing circuit 8 testing signal input ends and solenoid valve and is connected, diode D4 negative pole and resistance R 81 1 ends, capacitor C 7 one ends connect, resistance R 81 the other ends are connected with triode Q4 base stage, triode Q4 collector electrode and controller 1, resistance R 82 1 ends connect, resistance R 82 another termination positive sources, ground connection after capacitor C 7 the other ends are connected with triode Q4 emitter.
As mentioned above, in case driving tube is breakdown, namely driving circuit for electromagnetic valve testing circuit 8 detects solenoid valve and keeps end 22 for high level signal, and system is judged as fault.If the driving tube of inhaling by force on coil driver 5 is breakdown, controller 1 stops output and drives control impuls, and electric current is not kept in keeping coil drive circuit 6 driving tube cut-offs like this on keeping coil, and solenoid valve T2 closes again, and system enters lock state; If the driving tube on keeping coil drive circuit 6 is breakdown, same, controller 1 stops output and drives control impuls, at this moment ought be heated to uniform temperature, temperature controller switch S4 is triggered and is disconnected, and electromagnetic valve coil does not have electric current to flow through, solenoid valve T2 closes again, and system enters lock state.
The present invention realizes the cold protective function of system by blast switch S3; system is when standby; blower fan 10 does not start; blast switch S3 is in off state; make strong suction coil driver 5 and power supply disconnect, at this moment controller 1 breaks down or inhaling by force on coil driver 5 triode Q1, Q3 breaks down and all can't provide electric current to the strong coil 21 of inhaling, and solenoid valve T2 also just can't adhesive; the passage of combustion gas is in off state, belongs to safe condition.
The present invention realizes the heat protection function of system by temperature controller switch S4; temperature controller switch S4 is not subject to being in closed state before high temperature triggers; when water heater enters normal combustion; in case when sensing excess Temperature, temperature controller switch S4 can disconnect, the upper coil of solenoid valve T2 all is disconnected and being connected of power supply; solenoid valve T2 meeting auto-closing; blast tube is in off state, belongs to safe condition, can prevent that dry combustion method and other high temperature accidents from causing the generation of accident.
As mentioned above to having the improvement of driving circuit for electromagnetic valve now; the description of this embodiment is as to the restriction of this case protection domain, and all designs identical with this case circuit structure or make the equivalent circuit replacement on this case basis all should be shown in the protection domain that falls into this case.

Claims (7)

1. the Self-attracting solenoid valve drive unit of a forced exhausting gas water heater, it is characterized in that including controller (1), solenoid valve (T2), blast switch (S3), and temperature controller switch (S4), described solenoid valve (T2) coil is provided with solenoid valve and inhales by force end (21), solenoid valve is kept end (22) and solenoid valve common port (23), described solenoid valve common port (23) connects power supply one end by temperature controller switch (S4), described blast switch (S3) end is connected with the power supply the other end, be connected with blast switch testing circuit (7) between blast switch (S3) the other end and controller (1), described controller (1) and solenoid valve are inhaled by force the strong suction coil driver (5) that is connected with between end (21) for driving solenoid valve (T2) adhesive, described strong suction coil driver (5) power end is connected with power supply by blast switch (S3), described controller (1) and solenoid valve are kept the keeping coil drive circuit (6) that is connected with between end (22) be used to keeping solenoid valve (T2) attracting state, described drive unit also includes the driving circuit for electromagnetic valve testing circuit (8) of inhaling coil driver (5) and keeping coil drive circuit (6) output terminal level for detection of strong, the test end of described driving circuit for electromagnetic valve testing circuit (8) is kept end (22) with solenoid valve and is connected, driving circuit for electromagnetic valve testing circuit (8) output terminal is connected with controller (1).
2. the Self-attracting solenoid valve drive unit of a kind of forced exhausting gas water heater according to claim 1, is characterized in that also being connected with on described controller (1) blower fan (10).
3. the Self-attracting solenoid valve drive unit of a kind of forced exhausting gas water heater according to claim 1, it is characterized in that described strong suction coil driver (5) includes capacitor C 5, resistance R 51, resistance R 52, PNP triode Q1, NPN triode Q3, and diode D3, described capacitor C 5 one ends are connected with controller (1) as strong coil driver (5) the control signal input end of inhaling, capacitor C 5 the other ends are connected with triode Q3 base stage by resistance R 52, triode Q3 grounded-emitter connection, triode Q3 collector electrode is connected with triode Q1 base stage by resistance R 51, triode Q1 emitter is connected with positive source by blast switch (S3), triode Q1 collector electrode is inhaled by force end (21) as strong suction coil driver (5) control signal output terminal and solenoid valve, diode D3 negative pole connects, diode D3 plus earth.
4. the Self-attracting solenoid valve drive unit of a kind of forced exhausting gas water heater according to claim 1, it is characterized in that described keeping coil drive circuit (6) includes capacitor C 2, resistance R 61, resistance R 62, PNP triode Q2, described capacitor C 2 one ends are connected with controller (1) as keeping coil drive circuit (6) control signal input end, capacitor C 2 the other ends are connected with triode Q2 base stage, triode Q2 emitter is connected with power supply, described resistance R 62 is connected between power supply and triode Q2 base stage, triode Q2 collector electrode is kept end (22) as keeping coil drive circuit (6) output terminal and solenoid valve and is connected.
5. the Self-attracting solenoid valve drive unit of according to claim 1 or 4 described a kind of forced exhausting gas water heaters, is characterized in that described keeping coil drive circuit (6) power end is connected with power supply by blast switch (S3).
6. the Self-attracting solenoid valve drive unit of a kind of forced exhausting gas water heater according to claim 1, it is characterized in that described blast switch testing circuit (7) includes resistance R 71 and resistance R 72, described resistance R 71 1 ends are connected with positive source by blast switch (S3), resistance R 71 the other ends are connected with controller (1), resistance R 72 1 ends as the testing signal output terminal, resistance R 72 the other end ground connection.
7. the Self-attracting solenoid valve drive unit of a kind of forced exhausting gas water heater according to claim 1, it is characterized in that described driving circuit for electromagnetic valve testing circuit (8) includes diode D4, resistance R 81, resistance R 82, NPN triode Q4, and capacitor C 7, described diode D4 positive pole is kept end (22) as driving circuit for electromagnetic valve testing circuit (8) testing signal input end and solenoid valve and is connected, diode D4 negative pole and resistance R 81 1 ends, capacitor C 7 one ends connect, resistance R 81 the other ends are connected with triode Q4 base stage, triode Q4 collector electrode and controller (1), resistance R 82 1 ends connect, resistance R 82 another termination positive sources, ground connection after capacitor C 7 the other ends are connected with triode Q4 emitter.
CN201210379628.8A 2012-09-29 2012-09-29 Self-suction electromagnetic valve driving device of forced-ventilated gas water heater Active CN103123011B (en)

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CN103123011B CN103123011B (en) 2015-07-01

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107620828A (en) * 2017-09-20 2018-01-23 莱芜钢铁集团有限公司 Magnetic valve emergency service equipment and blast furnace process stove feeding system
CN111120716A (en) * 2020-01-07 2020-05-08 星宇电子(宁波)有限公司 Micro-power consumption electromagnetic valve

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101303161A (en) * 2008-06-12 2008-11-12 中山华帝燃具股份有限公司 Intelligent gas water heater and control method thereof
US20090308332A1 (en) * 2007-10-01 2009-12-17 Tanbour Emadeddin Y Water heater with forced draft air inlet
CN102538214A (en) * 2012-01-19 2012-07-04 中山华帝燃具股份有限公司 Smoke discharge blockage control method and system for gas water heater
CN202852141U (en) * 2012-09-29 2013-04-03 中山华帝燃具股份有限公司 Self-suction electromagnetic valve driving device of gas water heater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090308332A1 (en) * 2007-10-01 2009-12-17 Tanbour Emadeddin Y Water heater with forced draft air inlet
CN101303161A (en) * 2008-06-12 2008-11-12 中山华帝燃具股份有限公司 Intelligent gas water heater and control method thereof
CN102538214A (en) * 2012-01-19 2012-07-04 中山华帝燃具股份有限公司 Smoke discharge blockage control method and system for gas water heater
CN202852141U (en) * 2012-09-29 2013-04-03 中山华帝燃具股份有限公司 Self-suction electromagnetic valve driving device of gas water heater

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107620828A (en) * 2017-09-20 2018-01-23 莱芜钢铁集团有限公司 Magnetic valve emergency service equipment and blast furnace process stove feeding system
CN107620828B (en) * 2017-09-20 2024-03-19 莱芜钢铁集团有限公司 Electromagnetic valve emergency power supply equipment and blast furnace smelting furnace feeding system
CN111120716A (en) * 2020-01-07 2020-05-08 星宇电子(宁波)有限公司 Micro-power consumption electromagnetic valve

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