CN205090630U - Gas hot water system's control system - Google Patents
Gas hot water system's control system Download PDFInfo
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- CN205090630U CN205090630U CN201520856561.1U CN201520856561U CN205090630U CN 205090630 U CN205090630 U CN 205090630U CN 201520856561 U CN201520856561 U CN 201520856561U CN 205090630 U CN205090630 U CN 205090630U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 75
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- 238000011144 upstream manufacturing Methods 0.000 claims description 3
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- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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Abstract
The utility model discloses a gas hot water system's control system, gas hot water system has variable speed fan and proportional valve, gas hot water system's air intake to exhaust port is formed with airflow channel, control system includes: first detection piece, it can continuously detect pressure force information in the airflow channel, the second detection piece, its can give -out order when the interior pressure of airflow channel reaches the predetermined pressure, the controller, it has signal input part and a signal output part, first detection piece with the signal output part of second detection piece with the signal input part of controller connects, the variable speed fan with the signal input part of proportional valve with the signal output part of controller connects. Gas hot water system's control system can reduce gas hot water system's fault rate, improves gas hot water system reliability of operation to improve user experience.
Description
Technical field
The utility model relates to gas utensil field, particularly a kind of control system of gas-fired water heater.
Background technology
Gas-fired water heater is usually using combustion gas as fuel, and transferred energy to by combustion heating mode to reach a kind of gas utensil of the object preparing hot water in the cold water flowing through heat exchanger, its concrete form comprises wall-hung boiler, gas heater etc.General gas-fired water heater mainly comprises: the detecting element etc. of burner, heat exchanger, proportioning valve, blower fan and detection blower fan working order.
At present, when most of gas-fired water heater uses, the working order of blower fan is detected by blast switch.Blast switch is the switching device with blast ON/OFF value.When wind pressure value reaches ON value, show that blower fan can normally work.When situations such as occurring smoke pipe blocking, smoke pipe lengthening, blower fan dust stratification makes ventilation pressure loss be low to moderate OFF value, blast switch disconnects, and then cuts off gas ratio valve.Therefore, current gas-fired water heater is arranged through the function that blast switch merely can only reach stoppage protection, and is difficult to the change concrete to blast and does corresponding adjustment.
For this reason, Chinese patent description CN204176919U gives a kind of implementation.Concrete, aforementioned patents disclose a kind of wall-hung boiler with air-flow monitoring function, it is by installing air flow sensor at the air outlet place of blower fan, detects the air pressure produced at fan outlet place when blower fan rotates in real time.When detect the air pressure at air outlet place do not meet gas discharging require, meet gas discharging requirement by making the air pressure at air outlet place to blower fan adjustment.But, be in for a long time in the flue gas environment of higher temperature at the above-mentioned air flow sensor being arranged on fan outlet place and easily lost efficacy.When described air flow sensor lost efficacy, whole wall-hung boiler also can only be in disorderly closedown state and cannot work on.On the whole, the fault rate of above-mentioned wall-hung boiler is higher, and reliability is poor, and then Consumer's Experience is poor.
Utility model content
The purpose of this utility model is to provide a kind of control system of gas-fired water heater, can reduce the fault rate of gas-fired water heater, improves gas-fired water heater reliability of operation, thus improves Consumer's Experience.
Above-mentioned purpose of the present utility model can adopt following technical proposal to realize: a kind of control system of gas-fired water heater, described gas-fired water heater has speed-changing draught fan and proportioning valve, the air inlet of described gas-fired water heater is formed with gas channel to exhaust opening, and described control system comprises:
First detection piece, it can continue to detect the pressure information in described gas channel;
Second detection piece, it can send instruction when reaching predetermined pressure by pressure in described gas channel;
Controller, it has signal input part and signal output part, described first detection piece is connected with the signal input part of described controller with the signal output part of described second detection piece, and described speed-changing draught fan is connected with the signal output part of described controller with the signal input part of described proportioning valve.
Further, described first detection piece is wind pressure sensor, and described second detection piece is blast switch.
Further, described set-up of control system has the communicating pipe described first detection piece, the second detection piece are communicated with; Described communicating pipe is three-way pipe structure, and it is provided with the first end be connected with described gas channel, the second end be connected with described first detection piece, the 3rd end be connected with described second detection piece.
Further, the radical of described three-way pipe is one,
Described first detection piece is provided with the first detection mouth, second and detects mouth, and described first detects mouth is connected with the negative pressure cavity of described gas-fired water heater, and described second detects mouth is connected with described second end;
Described second detection piece is provided with the 3rd and detects mouth, the 4th detection mouth, and the described 3rd detects mouth is connected with the negative pressure cavity of described gas-fired water heater, and the described 4th detects mouth is connected with described 3rd end.
Further, the radical of described three-way pipe is two, is respectively the first three-way pipe and the second three-way pipe,
Be provided with the Venturi tube for pressure in described gas channel, described Venturi tube is provided with negative pressure acquisition port;
Along gas flow direction, the first end of described first three-way pipe is communicated with the Upstream section of the negative pressure acquisition port of pipe in civilian district, and the first end of described second three-way pipe is connected with the negative pressure acquisition port of described Venturi tube;
Described first detection piece is provided with the first detection mouth, second and detects mouth, and described first detects mouth is connected with the second end of described first three-way pipe, and described second detects mouth is connected with the second end of described second three-way pipe;
Described second detection piece is provided with the 3rd and detects mouth, the 4th detection mouth, and described 3rd detection piece is connected with the 3rd end of described first three-way pipe, and the described 4th detects mouth is connected with the 3rd end of described second three-way pipe.
Further, first end, second end, the 3rd of described communicating pipe have interconnecting part, and described interconnecting part, lower than the position of described first detection piece, the second detection piece, is provided with the device for storing liquid that can store hydrops at described interconnecting part.
The technical scheme provided from above the application's embodiment, described control system comprises: the first detection piece, the second detection piece and controller.Described controller, it has signal input part and signal output part, described first detection piece is connected with the signal input part of described controller with the signal output part of described second detection piece, and described speed-changing draught fan is connected with the signal output part of described controller with the signal input part of described proportioning valve.Described controller its Data Control speed-changing draught fan that can detect according to the first detection piece or the second detection piece and/or proportioning valve.Such as when described first detection piece lost efficacy; described controller can switch to Data Control speed-changing draught fan according to described second detection piece or proportioning valve; whole gas-fired water heater can not be in disorderly closedown state and cannot work on; therefore, it is possible to reduce the fault rate of gas-fired water heater; improve gas-fired water heater reliability of operation, thus improve Consumer's Experience.
Accompanying drawing explanation
Fig. 1 is the structural representation of the gas-fired water heater that the application's embodiment provides;
Fig. 2 is the block diagram of the control system of the gas-fired water heater that the application's embodiment provides;
Fig. 3 is the first corresponding relation figure of the proportioning valve electric current that provides of the application's embodiment and goal pressure;
Fig. 4 is the first control logic block diagram of the control system that the application's embodiment provides;
Fig. 5 is the second corresponding relation figure of the proportioning valve electric current that provides of the application's embodiment and rotation speed of fan;
Fig. 6 is the second control logic block diagram of the control system that the application's embodiment provides;
Fig. 7 is the 3rd corresponding relation figure of the proportioning valve electric current that provides of the application's embodiment and blower fan electric current;
Fig. 8 is the 4th corresponding relation figure of the proportioning valve electric current that provides of the application's embodiment and blower fan dutycycle;
Fig. 9 is the second control logic block diagram of the control system that another embodiment of the application provides;
Figure 10 is the combustion curve coupling figure of the proportioning valve electric current that provides of the application's embodiment and rotation speed of fan;
Figure 11 is the logic diagram of the blast switch detection wind pressure sensor that the application's embodiment provides.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the technical solution of the utility model is elaborated, these embodiments should be understood and be only not used in restriction scope of the present utility model for illustration of the utility model, after having read the utility model, the amendment of those skilled in the art to the various equivalent form of value of the present utility model has all fallen in the application's claims limited range.
The utility model provides a kind of control system of gas-fired water heater, can improve gas-fired water heater reliability of operation and security.
See also Fig. 1 and Fig. 2, gas-fired water heater described in the utility model has speed-changing draught fan 11 and proportioning valve 2, and air inlet 12 to the exhaust opening 13 of described gas-fired water heater is formed with gas channel.Described control system 10 comprises: the first detection piece 14, and it can continue to detect the pressure information in described gas channel; Second detection piece 15, it can send instruction when reaching predetermined pressure by pressure in described gas channel; Controller 20, it has signal input part and signal output part, described first detection piece 14 is connected with the signal input part of described controller 20 with the signal output part of described second detection piece 15, and described speed-changing draught fan 11 is connected with the signal output part of described controller 20 with the signal input part of described proportioning valve 2.
In the application's embodiment, described control system 10 comprises: the first detection piece 14, second detection piece 15 and controller 20.Described controller 20, it has signal input part and signal output part, described first detection piece 14 is connected with the signal input part of described controller 20 with the signal output part of described second detection piece 15, and described speed-changing draught fan 11 is connected with the signal output part of described controller 20 with the signal input part of described proportioning valve 2.Its Data Control speed-changing draught fan 11 that can detect according to the first detection piece 14 or the second detection piece 15 of described controller 20 and/or proportioning valve 2 work.Such as when described first detection piece 14 lost efficacy; described controller 20 can switch to Data Control speed-changing draught fan 11 according to the second detection piece 15 or proportioning valve 2; whole gas-fired water heater can not be in disorderly closedown state and cannot work on; therefore, it is possible to reduce the fault rate of gas-fired water heater; improve gas-fired water heater reliability of operation, thus improve Consumer's Experience.
In the present embodiment, described gas channel can be the gas passage formed from air inlet 12 to the burner of its shell, heat exchanger, speed-changing draught fan 11 and smoke exhaust pipe.Exhaust opening 13 can be the outlet of smoke exhaust pipe.Certainly, the order forming gas flow is not limited to foregoing description, and gas flow can also be the gas passage formed from air inlet 12 to speed-changing draught fan 11, burner, heat exchanger and smoke exhaust pipe.Certainly, described those skilled in the art, under the enlightenment of present techniques marrow, can also make other change, as long as but its function realized and the effect that reaches and the application same or similar, all should be covered by the application's protection domain.
In the present embodiment, described speed-changing draught fan 11 can be the DC fan of a stepless time adjustment can be also the AC blower fan of multistep speed regulation, and the application does not do concrete restriction at this.Corresponding relation is there is between the electric current of described speed-changing draught fan 11 or the rotating speed of dutycycle and speed-changing draught fan 11.Concrete, such as, when described speed-changing draught fan 11 is the low-voltage direct blower fan of stepless time adjustment, described speed-changing draught fan 11 can be provided with current detecting part, for detecting the electric current of blower fan.Described speed-changing draught fan 11 by the corresponding relation between the electric current of speed-changing draught fan 11 and rotating speed, by the current value detected, can adjust the rotating speed entering speed-changing draught fan 11, makes it meet combustion requirements.When described speed-changing draught fan 11 is the HVDC blower fan of stepless time adjustment, described speed-changing draught fan is provided with Rotating speed measring part, such as Hall element etc.Described speed-changing draught fan 11 can by the corresponding relation between the dutycycle of speed-changing draught fan 11 and rotating speed, and the rotating speed of adjustment speed-changing draught fan 11, makes it meet combustion requirements.The rotating speed of speed-changing draught fan 11 can affect the flowing velocity of gas in described gas flow.Under usual state, the rotating speed of speed-changing draught fan 11 is faster, and the gas flow rates in described gas flow is faster; The rotating speed of speed-changing draught fan 11 is slower, and the gas flow rates in described gas flow is slower.Speed-changing draught fan 11 can flow from the direction of air inlet 12 to exhaust opening 13 by the gas in driving gas runner.In this process, enter the air in gas flow from air inlet 12, can carry out burning by combustion gas at burner and be utilized, namely speed-changing draught fan 11 drives gas to flow, for the fuel gas buring flowed in burner provides air.Speed-changing draught fan 11 specifically can comprise: Blower Housing, is arranged on the impeller in described Blower Housing, and drives the motor of described wheel rotation.Wherein said motor can be arranged in described Blower Housing, also can be arranged on outside described Blower Housing.At air outlet 18 place of described speed-changing draught fan 11, external interference factor is less, can arrange pressure sensor location, to ensure sensitivity and the reliability of pressure.
In the present embodiment, described controller 20, it has signal input part and signal output part, described first detection piece 14 is connected with the signal input part of described controller 20 with the signal output part of described second detection piece 15, and described speed-changing draught fan 11 is connected with the signal output part of described controller 20 with the signal input part of described proportioning valve 2.Controller 20 can pass through the electric current or the dutycycle that control speed-changing draught fan 11, to regulate the rotating speed of speed-changing draught fan 11.In addition, controller 20 can pass through the electric current regulating proportioning valve 2, with the aperture of control ratio valve 2.Controller 20 can include microprocessor, and the fan drive circuit be connected with microprocessor and speed-changing draught fan 11, and the proportioning valve drive circuit be connected with microprocessor and proportioning valve 2.Described controller 20 at least has two kinds of control logics, and described controller 20 can call corresponding control logic according to actual needs, to control at least one in described speed-changing draught fan 11 and described proportioning valve 2.
In the present embodiment, described controller 20 at least can have the first control logic 21 and the second control logic 22; Described first control logic 21 controls described speed-changing draught fan 11 and/or described proportioning valve 2 according to the Detection Information of the first detection piece 14, described second control logic 22 controls described speed-changing draught fan 11 and/or described proportioning valve 2 according to the Detection Information of the second detection piece 15, when described first control logic 21 operationally, the information that the first detection piece 14 detects switches to the second control logic 22 when exceeding preset range and runs.
In the present embodiment, the first detection piece 14, for when described speed-changing draught fan 11 rotates, continues to detect the pressure information in described gas channel.What the pressure sensor location of described first detection piece 14 was concrete can in air outlet 18 position of described speed-changing draught fan 11, can certainly other positions in gas channel.Described pressure information can represent the gas pressure state in gas flow.First detection piece 14 is electrically connected with controller 20, makes it possible to the testing result of the pressure information collected to be supplied to controller 20.
In the present embodiment, described first detection piece 14, second detection piece 15 is electrically connected with described controller 20 respectively, so that the signal detected is supplied to described controller 20, so that described controller 20 calls corresponding control logic according to the described signal detected.
In one embodiment, described first detection piece 14 is the detection piece that can continue the pressure information detected in described gas channel.Described control system 10 comprises memory 30, and it at least stores the first corresponding relation of proportioning valve 2 electric current of goal pressure in described gas channel and described gas-fired water heater; The pressure information that described first control logic 21 detects according to described first detection piece 14 and described first corresponding relation control described speed-changing draught fan 11 and/or described proportioning valve 2.
In the present embodiment, described first detection piece 14 can be a pressure sensor that can detect pressure information in described gas channel in real time.The concrete signal form that described pressure sensor detects can be the one in following form: frequency, pulse, voltage.Preferably, it can be frequency form.
In the present embodiment, described memory 30 may be used for storing data.Concrete, memory 30 can be magnetic storage, also can be digital storage.Preferably, it is digital storage.
In the present embodiment, refer to Fig. 3, described corresponding relation can comprise a function, also can comprise a tables of data.Concrete, described first corresponding relation can pass through function y
1=k
1x+b
1characterize.Wherein y
1can represent goal pressure signal, x can represent proportioning valve current signal, k
1therebetween the proportionality coefficient that can draw for experimentally statistical law, b
1it can be a constant.
In the present embodiment, refer to Fig. 4, controller 20 can carry out control work according to described first control logic 21 corresponding with described first detection piece 14.During normal use, described control system 10, when not having need of work, is generally in holding state.When work requirements having been detected, when namely receiving user instruction, the flow that the temperature that can set hot water according to user supplies water, calculated load, determines that required gas flow is to regulate proportioning valve 2 electric current.Then the first corresponding relation in memory 30 is called, then based on described first corresponding relation and the proportioning valve 2 Current calculation target wind pressure value determined.After determining required target wind pressure value, if the actual wind pressure value that now pressure information that detects of the first detection piece 14 is corresponding and described target wind pressure value deviation are comparatively large, then can regulate speed-changing draught fan 11 rotating speed, increase or reduce blast.Further, judge whether current blast reaches pre-provisioning request.Described pre-provisioning request can be the positive and negative certain error range of described target wind pressure value.After described blast reaches pre-provisioning request, under normal circumstances, speed-changing draught fan 11 maintains current rotating speed continuous firing, can enter holding state after needing to finishing the work.
In one embodiment, described second detection piece 15 is the detection piece that the pressure in described gas channel sends instruction when reaching predetermined pressure, described second control logic 22 is after receiving the instruction that described second detection piece 15 sends, according to running parameter and the proportioning valve electric current of current described speed-changing draught fan 11, set up the second corresponding relation of proportioning valve electric current and described speed-changing draught fan 11 running parameter, control described speed-changing draught fan 11 and/or described proportioning valve 2 according to described second corresponding relation.
In the present embodiment, described second detection piece 15 its can send instruction when pressure reaches predetermined pressure in described gas channel.What the pressure sensor location of described second detection piece 15 was concrete can in air outlet 18 position of described speed-changing draught fan 11, can certainly other positions in gas channel.Second detection piece 15 is electrically connected with controller 20, makes it possible to the microprocessor instruction sent being supplied to controller 20.
In a concrete embodiment, described first detection piece 14 is wind pressure sensor, described second detection piece 15 is blast switch, when the described pressure information that described wind pressure sensor detects exceeds preset range, described controller controls described speed-changing draught fan and rotates, when the pressure in described gas flow reaches after blast switch predetermined pressure, described controller controls described blast switch and sends instruction.
In the present embodiment, described first detection piece 14 can be wind pressure sensor, described second detection piece 15 can be blast switch.When the described pressure information that described wind pressure sensor detects exceeds preset range, described controller 20 controls described speed-changing draught fan 11 and rotates, when the pressure in described gas flow reaches after blast switch predetermined pressure, described controller 20 controls described blast switch and sends instruction.
In the present embodiment, when the described pressure information that described wind pressure sensor detects exceeds preset range, namely when described wind pressure sensor lost efficacy, described controller 20 controls described speed-changing draught fan 11 and rotates, after the pressure in described gas flow reaches predetermined pressure, described controller 20 controls described blast switch and sends instruction.Such as, described blast switch is 140/170, then represent that the blast that it disconnects that blast corresponding to OFF point is 140Pa, its closed ON point is corresponding is 170Pa.Certainly, in error allowed band, described OFF point, ON point can respectively about 140/170.When described blast switch closes, described controller 20 detects the closure signal that described blast switch sends, and then can call the second control logic 22, controls rotation speed of fan.
In one embodiment, described second corresponding relation can be: functional relation or the tables of data by blower fan running parameter and described proportioning valve electric current corresponding stored between blower fan running parameter and described proportioning valve electric current.Corresponding relation in addition between described blower fan running parameter and described proportioning valve electric current can also be other forms, and the application is at this and be not construed as limiting.
In the present embodiment, there is relation one to one between the running parameter of described blower fan and proportioning valve electric current.Such as, passing ratio valve electric current uniquely can determine the running parameter of blower fan.
In one embodiment, the running parameter of described speed-changing draught fan can be rotation speed of fan or operating current.
In the present embodiment, between the operating current of described blower fan and the rotating speed of blower fan, there is relation one to one, uniquely can be determined the rotating speed of blower fan by the operating current of blower fan.
Refer to Fig. 5, described corresponding relation can comprise a function.Concrete, described second corresponding relation can pass through function y
2=k
2x+b
2characterize.Wherein y
2can represent rotation speed of fan, x can represent proportioning valve current signal, k
2therebetween the proportionality coefficient that can draw for experimentally statistical law, b
2it can be a constant.
In the present embodiment, refer to Fig. 6, controller 20 can carry out control work according to described second control logic 22 corresponding with described second detection piece 15.
First the working region of blower fan can be determined.Concrete, the working region of speed-changing draught fan 11 can be in the rotating speed of the blower fan of OFF point and ON point correspondence and proportioning valve 2 electric current corresponding respectively with the rotating speed of described blower fan for the blast switch determined under standard condition.Described standard condition can refer to that blower fan is not occurring that the blocking of blower fan dust stratification, smoke pipe, smoke pipe lengthening, external wind overwhelm the situations such as filling.
When losing efficacy appears in described first detection piece 14, described controller 20 can switch to the second control logic 22 by the first control logic 21 and control.
When described controller 20 carries out control work by the second control logic 22, the flow rate calculation load that the temperature that first can set hot water according to user supplies water, determines that required gas flow is to regulate proportioning valve electric current.Then call the second corresponding relation in memory 30, and based on described second corresponding relation and the proportioning valve Current calculation target fan rotating speed determined, then according to described target fan rotational speed regulation blower fan, and judge whether rotation speed of fan reaches pre-provisioning request.Described pre-provisioning request can be the positive and negative certain error range of described target fan rotating speed.After described rotation speed of fan reaches pre-provisioning request, under normal circumstances, speed-changing draught fan 11 maintains current rotating speed continuous firing, can enter holding state after needing to finishing the work.If current rotation speed of fan does not reach pre-provisioning request, then continue to regulate rotation speed of fan, make it meet pre-provisioning request.
In one embodiment, described second control logic controls described speed-changing draught fan 11 and/or proportioning valve 2 according to the 4th corresponding relation of the 3rd corresponding relation of the current electric current of described speed-changing draught fan 11 and speed-changing draught fan electric current and proportioning valve electric current or the current dutycycle of described speed-changing draught fan 11 and speed-changing draught fan dutycycle and proportioning valve electric current.
In the present embodiment, refer to Fig. 7, described corresponding relation can comprise a function, also can comprise a tables of data.Concrete, described 3rd corresponding relation can pass through function y
3=k
3x+b
3characterize.Wherein y
3can represent blower fan electric current, x can represent proportioning valve current signal, k
3therebetween the proportionality coefficient that can draw for experimentally statistical law, b
3it can be a constant.
Refer to Fig. 8, described 4th corresponding relation can pass through function y
4=k
4x+b
4characterize.Wherein y
4can represent blower fan dutycycle, x can represent proportioning valve current signal, k
4therebetween the proportionality coefficient that can draw for experimentally statistical law, b
4it can be a constant.
In the present embodiment, refer to Fig. 9, controller 20 can carry out control work according to described second control logic 22 corresponding with the electric current or dutycycle of described speed-changing draught fan 11.
Such as, when described speed-changing draught fan 11 is fan with low voltage, it can carry out control work according to described second control logic 22 corresponding with the electric current of described speed-changing draught fan 11.Such as: when losing efficacy appears in described first detection piece 14, described controller 20 can switch to the second control logic 22 by the first control logic 21 and control.
When described controller 20 carries out control work by the second control logic 22 corresponding with the electric current of speed-changing draught fan 11, the flow rate calculation load that the temperature that first can set hot water according to user supplies water, determines that required gas flow is to regulate proportioning valve electric current.Then the 3rd corresponding relation in memory 30 is called, and based on described 3rd corresponding relation and determine proportioning valve electric current determination target fan electric current.Owing to there is relation one to one between the blower fan electric current of described speed-changing draught fan 11 and rotation speed of fan.According to described target fan electric current, and the one-to-one relationship between blower fan electric current and rotating speed, target fan rotating speed can be determined.Then according to described target fan rotational speed regulation blower fan, and judge whether rotation speed of fan reaches pre-provisioning request.Described pre-provisioning request can be the positive and negative certain error range of described target fan rotating speed.After described rotation speed of fan reaches pre-provisioning request, judge whether the electric current of blower fan reaches requirement further.If now the electric current of blower fan reaches requirement, then under normal circumstances, speed-changing draught fan 11 maintains current rotating speed continuous firing, can enter holding state after needing to finishing the work.If current rotation speed of fan does not reach pre-provisioning request, or blower fan electric current does not reach requirement, then continue to regulate rotation speed of fan, make it meet pre-provisioning request.
Such as, when described speed-changing draught fan 11 is high pressure positive blower, it can carry out control work according to described second control logic 22 corresponding with the dutycycle of described speed-changing draught fan 11.Such as when losing efficacy appears in described first detection piece 14, described controller 20 can switch to the second control logic 22 by the first control logic 21 and control.
When described controller 20 carries out control work by the second control logic 22 corresponding with the dutycycle of speed-changing draught fan 11, first can set the temperature of hot water, the flow rate calculation load of water supply according to user, determine that required gas flow is to regulate proportioning valve electric current.Then the 4th corresponding relation in memory 30 is called, and based on described 4th corresponding relation and the proportioning valve electric current determination target fan dutycycle determined.Owing to there is relation one to one between the blower fan dutycycle of described speed-changing draught fan 11 and rotation speed of fan.According to described target fan dutycycle, and the one-to-one relationship between blower fan dutycycle and rotating speed, target fan rotating speed can be determined.Then according to described target fan rotational speed regulation blower fan, and judge whether rotation speed of fan reaches pre-provisioning request.Described pre-provisioning request can be the positive and negative certain error range of described target fan rotating speed.After described rotation speed of fan reaches pre-provisioning request, judge whether the dutycycle of blower fan reaches requirement further.If now the dutycycle of blower fan reaches requirement, then under normal circumstances, speed-changing draught fan 11 maintains current rotating speed continuous firing, can enter holding state after needing to finishing the work.If current rotation speed of fan does not reach pre-provisioning request, or blower fan dutycycle does not reach requirement, then continue to regulate rotation speed of fan, make it meet pre-provisioning request.
In one embodiment, described second detection piece 15 is the detection piece of the pressure information detected in described gas channel, and the pressure information that described second control logic 22 detects according to described second detection piece 15 and described first corresponding relation control described speed-changing draught fan 11 and/or described proportioning valve 2.
In the present embodiment, described second detection piece 15 can for detecting the detection piece of the pressure signal in described gas channel with described first detection piece 14.It can be such as wind pressure sensor.Described first detection piece 14, second detection piece 15 is all electrically connected with described controller 20, the pressure information detected is supplied to the microprocessor of described controller 20.
Described memory 30 can store the first corresponding relation of proportioning valve 2 electric current of goal pressure in described gas channel and described gas-fired water heater.
During work, first based on described first corresponding relation, first control logic 21 corresponding with described first detection piece 14 can be called and carry out control work in described controller 20.When the first detection piece 14 lost efficacy, namely when the pressure signal determining that described first detection piece 14 of work at present detects exceeds preset range, controller 20 controls the second detection piece 15 and works, and according to second detection piece 15 gather pressure signal and described first corresponding relation, control described speed-changing draught fan 11 and/or described proportioning valve 2.
The controller 20 of control system described in the application, it carries out combination of two respectively with other control logics formed except double control system except calling corresponding with the first detection piece 14 first control logic 21, can also be combined to form multi-control system with other multiple control logics.The application does not do concrete restriction at this; described those skilled in the art are under the enlightenment of present techniques marrow; other change can also be made, as long as but its function realized and the effect that reaches and the application same or similar, all should be covered by the application's protection domain.
In one embodiment: described first detection piece 14 is for the pressure information in the described gas channel of lasting detection; Described second detection piece 15 sends instruction when reaching predetermined pressure for the pressure in described gas channel; Described control system 10 is provided with the communicating pipe be communicated with by described first detection piece 14, second detection piece 15; Described communicating pipe is three-way pipe structure, and it is provided with the first end be connected with described gas channel, the second end be connected with described first detection piece 14, the 3rd end be connected with described second detection piece 15.
In the present embodiment, described first detection piece 14, second detection piece 15 can carry out pressure by described communicating pipe.The structure of concrete described communicating pipe can be three-way pipe 17 structure.The communicating pipe of described three-way pipe 17 structure, not only structure is simple, and is conducive to ensureing that described first detection piece 14, second detection piece 15 gets the pressure at same position place.
In one embodiment, the first end of described communicating pipe, the second end, the 3rd end have interconnecting part, the position of described interconnecting part, lower than the position of described first detection piece 14, second detection piece 15, arranges device for storing liquid (not shown) at described interconnecting part.
In the present embodiment, described device for storing liquid can for having the cavity of a constant volume, and it is connected with the first end of described communicating pipe, the second end, the 3rd end respectively.
Described device for storing liquid may be used for storage communicating pipe inwall liquefies the little liquid pearl formed.Because the position of described liquid storing part is lower than the position of described first detection piece 14, second detection piece 15, little liquid pearl on communicating pipe inwall can flow to described device for storing liquid under gravity, thus the little liquid pearl of liquefaction formation can be prevented by flowing to the first detection piece 14 or the second detection piece 15 communicating pipe, affect the service life of detection piece.
In a concrete embodiment, the radical of described three-way pipe 17 can be one, described first detection piece 14 is provided with the first detection mouth 141, second and detects mouth 142, described first detects mouth 141 is connected with the negative pressure cavity 16 of described gas-fired water heater, and described second detects mouth 142 is connected with described second end.Described second detection piece 15 is provided with the 3rd and detects mouth 151, the 4th detection mouth 152, and the described 3rd detects mouth 151 is connected with the negative pressure cavity 16 of described gas-fired water heater, and the described 4th detects mouth 152 is connected with described 3rd end.
In the present embodiment, changing along with the distance with speed-changing draught fan 11 in gas flow, gas pressure also can corresponding existence change.According to Bernoulli equation in hydrodynamics, according to the pressure differential of 2 in gas flow, the flow determining gas just can be calculated.The signal that described first detection piece 14, second detection piece 15 detects can be described pressure differential.Described first detection piece 14, second detection piece 15 has two respectively and detects mouth, and the pressure acquisition pressure differential being detected mouth detection by described two as feedback signal, can be supplied to controller 20.
In the present embodiment, when three-way pipe 17 is the situation of, described first detection piece 14, second detection piece 15 can be arranged in the negative pressure cavity 16 of gas-fired water heater, and to ensure one of described first detection piece 14, second detection piece 15, to detect pressure that mouth gets be pressure in described negative pressure cavity 16.Pressure differential described in pressure initiation in the described gas channel that pressure in described negative pressure cavity 16 and three-way pipe 17 are got.
In another particular embodiment of the invention, the radical of described three-way pipe 17 can be two, and be respectively the first three-way pipe 171 and the second three-way pipe 172, be provided with the Venturi tube for pressure in described gas channel, described Venturi tube is provided with negative pressure acquisition port; Along gas flow direction, the described first end of the first three-way pipe 171 is communicated with the Upstream section of the negative pressure acquisition port of Venturi tube, and the described first end of the second three-way pipe 172 is connected with the negative pressure acquisition port of described Venturi tube.Described first detection piece 14 is provided with the first detection mouth 141, second and detects mouth 142.Described first detects mouth 141 is connected with the second end of described first three-way pipe 171, and described second detects mouth 142 is connected with the second end of described second three-way pipe 172.Described second detection piece 15 is provided with the 3rd and detects mouth 151, the 4th detection mouth 152.Described 3rd detection piece 151 is connected with the 3rd end of described first three-way pipe 171, and the described 4th detects mouth 152 is connected with the 3rd end of described second three-way pipe 172.
In the present embodiment, the position of described first detection piece 14, second detection piece 15 can according to the structural configuration unrestricted choice of gas-fired water heater entirety.Such as, as shown in Figure 1, described first detection piece 14 can be arranged on the outside of described negative pressure cavity 16.Owing to being provided with burner in described negative pressure cavity 16, its internal temperature is higher, when the pressure sensor that described first detection piece 14 is real-time detected pressures information, may lose efficacy owing to being in hot environment for a long time, therefore when described first detection piece 14 be arranged on described negative pressure cavity 16 outer time, be conducive to the service life of prolongation first detection piece 14.
In one embodiment, during described gas-fired water heater startup work, described controller 20 controls pressure information that described first control logic 21 detects according to described first detection piece 14 and described first corresponding relation controls described speed-changing draught fan 11 and/or described proportioning valve 2, when the described pressure information that described first detection piece 14 detects exceeds preset range, described controller 20 controls current control logic and switches to the second control logic 22.
In the present embodiment, described first detection piece 14 when described blower fan rotates, can detect the wind pressure sensor of the pressure information in described gas channel.Because described wind pressure sensor is the detection piece detected in real time, during work, fast response time, in real time regulating power are strong, and normally can work in the scope that rotation speed of fan is lower, the noise decibel therefore produced is also lower.Therefore, described first control logic 21 corresponding with the first detection piece 14 can be set as the main system of control system 10, when gas-fired water heater startup work, described controller 20 preferentially adopts described main system to control.
In one embodiment, described second detection piece 15 can be blast switch, the running parameter of described speed-changing draught fan 11 is rotating speed, described speed-changing draught fan 11 is provided with rotation speed of fan detecting element, described rotation speed of fan detecting element is electrically connected with described controller 20, and the rotation speed of fan detected can be transferred to described controller 20 by it.The rotating speed of the described speed-changing draught fan 11 that described rotation speed of fan detecting element obtains when described blast switch sends instruction is reference rotation speed.
In the present embodiment, described rotation speed of fan detecting element is used for detecting rotation speed of fan signal in real time, and described rotation speed of fan signal is supplied to the controller 20 be connected electrically.
In the present embodiment, when described second detection piece 15 is blast switch, it is to the OFF state that should be had to disconnect and closed ON state.When described blast switch closes, when being namely in ON state, the rotation speed of fan that rotation speed of fan detecting element now detects is set to reference rotation speed, so that determine the working range of blower fan and set up described second corresponding relation.
In one embodiment, when described blast switch can not send instruction under described reference rotation speed, described controller 20 controls described speed-changing draught fan based on described reference rotation speed, increase rotation speed of fan until described blast switch sends instruction with desired speed increment, rotation speed of fan when described blast switch sends instruction is revised reference rotation speed; Described controller 20 is based on the second corresponding relation described in described revised reference rotation speed correction.
Under normal circumstances, when described rotation speed of fan reaches reference rotation speed, blast switch can close.But under having the comparatively severe operating modes such as blower fan dust stratification, smoke pipe block, smoke pipe lengthens, external wind overwhelms filling to affect, probably blower fan needs to increase certain rotating speed on the basis of original reference rotation speed, and blast switch just can be made to close.
In the present embodiment, described desired speed increment can be a rotating speed step-length, such as, and 20 turns/time.After increasing certain desired speed increment, described blast switch reaches closure state.Now, the rotation speed of fan that rotation speed of fan detecting element detects is set to revised reference rotation speed.Described controller 20 is based on the working range of described revised reference rotation speed correction blower fan and described second corresponding relation.Concrete, can consult Fig. 5, when described reference rotation speed is because of after actual condition revises, correspondingly, described revised second corresponding relation curve, can for upwards obtaining after translation on the basis of described former relation curve.
Concrete, described revised second corresponding relation can pass through function y '
2=k
2x+b '
2characterize.Wherein y '
2can represent rotation speed of fan, x can represent proportioning valve current signal, k
2therebetween the proportionality coefficient that can draw for experimentally statistical law, b '
2it can be a constant.
In the present embodiment, by revising the reference rotation speed of speed-changing draught fan 11 and second corresponding relation corresponding with it, speed-changing draught fan 11 can be worked in a higher range of speeds.When the range of speeds of speed-changing draught fan 11 is higher, make gas-fired water heater can have normal combustion conditions under comparatively severe operating mode.In addition, after speed-changing draught fan 11 rotating speed improves, can alleviate blower fan dust stratification, smoke pipe blocking, smoke pipe lengthening, external wind overwhelms the impact of filling with and bringing, and ensures that gas-fired water heater can reliably work.
In one embodiment, described second corresponding relation can be the linear relationship between described speed-changing draught fan rotating speed and proportioning valve electric current.The minimum combustion rev of described speed-changing draught fan 11 can be described reference rotation speed and the first desired speed and.The maximum combustion rotating speed of described speed-changing draught fan 11 can be described reference rotation speed and the second desired speed and.Wherein, described first desired speed is less than described second desired speed.
In the present embodiment, described first desired speed, the second rotating speed reasonably can set according to the speed-changing draught fan 11 of reality and the working condition of gas-fired water heater own.Concrete, described first desired speed, the second desired speed can in speed-changing draught fan 11 normal range of operation, and a rational rotating speed in the operating modes such as fume emission situation up to standard.
In a concrete embodiment, when speed-changing draught fan 11 learns, rotation speed of fan time blast switch closes is set to X.Then the minimum combustion rev of described speed-changing draught fan 11 can be X+300 rev/min, and described speed-changing draught fan 11 maximum combustion rotating speed can be X+700 rev/min.
Refer to Figure 10, as 1 meter of smoke pipe, under 220V voltage condition, the speed-changing draught fan proportion relation that blast switch is closed 2300 revs/min time is as follows: the minimum combustion rev of speed-changing draught fan 11 can be 2300+300=2600 rev/min, now, corresponding proportioning valve current value can be 45 milliamperes; The maximum combustion rotating speed of speed-changing draught fan 11 can be 2300+700=3000 rev/min, and now, corresponding proportioning valve current value can be 115 milliamperes.
Certainly, gas-fired water heater situation is operationally changeable, more than 1 meter of possible smoke pipe, also may occur the outlet of blower fan dust stratification, smoke pipe or the situation such as import blocking.In time there is above-mentioned at least one situation, speed-changing draught fan 11 is not probably that 2300 to have quoted blast switch closed in the process of study.But no matter with which rotating speed close, burning operation curve all carries out redirect according to above rule.In the present embodiment, combustion curve can be a curve of translation, can the dynamic change along with the change of gas-fired water heater actual condition.Therefore, on the whole, the control system of described gas-fired water heater, have real-time regulating power strong, good reliability and the function such as Wind-Pressure Resistance, anti-dust stratification, can also adapt to different smoke pipe length in addition.
In one embodiment, the information that described controller 20 can detect according to described second detection piece 15 judges whether the information of described first detection piece 14 works in preset range.
In the present embodiment, during use, the reliability of described second detection piece 15 can be better than described first detection piece 14.
In the present embodiment, described preset range can set pointedly according to the first concrete detection piece 14.Such as when described first detection piece 14 is wind pressure sensor, what described preset range can detect for described wind pressure sensor occurs to pressure information: when pressure information interruption, pressure information generation null offset, pressure information output frequency exceed setting range, speed-changing draught fan adjustment wind speed, at least one during pressure information remains unchanged.When the signal that described first detection piece 14 detects exceeds preset range, then controller 20 carries out handover operation, and the available control logic calling other controls, and normally works to maintain gas-fired water heater.When detection piece is other concrete forms; can according to the failure mode of detection piece; set concrete scope; the application is at this and be not construed as limiting; described those skilled in the art are under the enlightenment of present techniques marrow; other change can also be made, as long as but its function realized and the effect that reaches and the application same or similar, all should be covered by the application's protection domain.
In one embodiment, when described first control logic 21 is the control logic of work at present, the information that described controller 20 can detect according to the second detection piece 15 judges whether the information that the first detection piece 14 detects works in preset range.
In the present embodiment, such as, when under the first detection piece 14 is in running order, described controller 20 controls according to described first control logic 21.Concrete, described second detection piece 15 can close when blower fan running parameter reaches predetermined value.To there being a force value when described second detection piece 15 closes, compared with the pressure information that described force value and described first detection piece 14 detect, if the force value that the force value that described first detection piece 14 detects detects with described second detection piece 15 is equal or close, then judge that described first detection piece 14 works in preset range; If keep off, then may fail by described first detection piece 14.
In a concrete embodiment, described first detection piece is wind pressure sensor, described second detection piece is blast switch, and pressure information when described controller can send instruction according to described blast switch judges pressure information that described wind pressure sensor detects whether in preset range.
Concrete, such as: described first detection piece 14 is wind pressure sensor, described second detection piece 15 is blast switch, and pressure information when described controller 20 can send instruction according to described blast switch detects described wind pressure sensor and detects pressure information that described wind pressure sensor detects whether in preset range.
In the present embodiment, described wind pressure sensor is in the state detecting pressure information in described gas channel in real time.Described blast switch is have the OFF point of disconnection and closed ON point.When the pressure in gas channel reaches certain pressure, described blast switch can be made to disconnect or close.Under normal circumstances, during described blast switch work, reliability is better than described wind pressure sensor.
Such as, described blast switch can be 140/170, then represent that the blast that it disconnects that blast corresponding to OFF point is 140Pa, its closed ON point is corresponding is 170Pa.When described blast switch closes, when described controller 20 detects the closure signal that described blast switch sends, pressure theory corresponding in gas channel should be about 170Pa or 170Pa.Now, controller 20 judges, whether the pressure information that described wind pressure sensor detects is in preset range.Described preset range can be about 170Pa, such as, between 165Pa to 175Pa.
In a concrete embodiment, refer to Figure 11, detect the whether normal control logic of wind pressure sensor based on described blast switch as follows.
During beginning, speed-changing draught fan 11 is in the self study stage, and the rotating speed of described speed-changing draught fan 11 is started from scratch and strengthened gradually.
In the process that speed-changing draught fan 11 rotating speed increases, judge whether blast switch closes.If detect, now blast switch closes, and obtains the target wind pressure value that blast switch closing point is corresponding, detects wind pressure value corresponding to blast switch closing point by wind pressure sensor simultaneously.The described wind pressure value that detects and described target wind pressure value are compared, if described within the wind pressure value that the detects preassigned about target wind pressure value, then show that described wind pressure sensor is normal, when the described wind pressure value detected is beyond preassigned, then show that described wind pressure sensor is abnormal.
In one embodiment, described gas-fired water heater has heating water system, domestic water system.
When described gas-fired water heater works in heating water system, and described controller 20 is when controlling described speed-changing draught fan 11 and/or described proportioning valve 2 according to described second corresponding relation, when the described pressure information that described wind pressure sensor detects does not exceed described preset range, switch to and control described speed-changing draught fan 11 and/or described proportioning valve 2 according to described pressure information and described first corresponding relation.
When described gas-fired water heater works at domestic water system, and described controller 20 is when controlling described speed-changing draught fan 11 and/or described proportioning valve 2 according to described second corresponding relation, when the described pressure information that described wind pressure sensor detects does not exceed described preset range, described controller 20 maintains and controls described speed-changing draught fan and/or described proportioning valve according to described second corresponding relation.
In the present embodiment, during switching, because speed-changing draught fan 11 need carry out self study process.Before speed-changing draught fan 11 self study is closed to blast switch, whole gas-fired water heater is in stopped status.Now, burner does not work, if be now domestic water system work, then shutdown suddenly can go out cold water, experiences impact larger on user.If be now the work of heating water system, because of short duration shutdown does not have too large difference variation to indoor, impact is experienced on user little.Therefore, on the whole, when described controller 20 is when controlling described speed-changing draught fan 11 and/or described proportioning valve 2 according to described second corresponding relation, described gas-fired water heater is when heating water system works, the first control logic can attempting switching to wind pressure sensor corresponding controls, when working for domestic water system, do not carry out handover operation as far as possible.
In the present embodiment, when the pressure information that the wind pressure sensor in described control system 10 detects occurs abnormal, described controller 20 can control described speed-changing draught fan 11 and/or described proportioning valve 2 according to described second corresponding relation.The abnormal conditions of described wind pressure sensor can comprise: when pressure information interruption, pressure information generation null offset, pressure information output frequency exceed preset range, speed-changing draught fan adjustment wind speed, pressure information remains unchanged.Accordingly, fault flag can be provided with in described controller 20, when described pressure information interruption, pressure information generation null offset, pressure information output frequency exceed preset range, speed-changing draught fan adjustment wind speed, pressure information remains unchanged and is set to Fisrt fault mark, the second failure identification, the 3rd failure identification, the 4th failure identification respectively.When being checked through any one fault in described default switching condition, the failure identification that corresponding display is corresponding; When corresponding failure vanishes being detected, then cancel failure identification corresponding to display.Now, show that described wind pressure sensor may recover normal.Namely the described pressure information that now described wind pressure sensor detects does not exceed described preset range, controller 20 can when heating water system works, switch to described first control logic 21 and carry out control work, and when domestic water system works, do not switch.
The foregoing is only several embodiment of the present utility model, although the embodiment disclosed by the utility model as above, the embodiment that described content just adopts for the ease of understanding the utility model, is not intended to limit the utility model.Any those skilled in the art described in the utility model; under the prerequisite not departing from the spirit and scope disclosed by the utility model; any amendment and change can be done on the formal of embodiment and details; but scope of patent protection of the present utility model, the scope that still must define with appended claims is as the criterion.
Claims (6)
1. a control system for gas-fired water heater, is characterized in that, described gas-fired water heater has speed-changing draught fan and proportioning valve, and the air inlet of described gas-fired water heater is formed with gas channel to exhaust opening, and described control system comprises:
First detection piece, it can continue to detect the pressure information in described gas channel;
Second detection piece, it can send instruction when reaching predetermined pressure by pressure in described gas channel;
Controller, it has signal input part and signal output part, described first detection piece is connected with the signal input part of described controller with the signal output part of described second detection piece, and described speed-changing draught fan is connected with the signal output part of described controller with the signal input part of described proportioning valve.
2. the control system of gas-fired water heater as claimed in claim 1, it is characterized in that, described first detection piece is wind pressure sensor, and described second detection piece is blast switch.
3. control system as claimed in claim 1, is characterized in that:
Described set-up of control system has the communicating pipe described first detection piece, the second detection piece are communicated with;
Described communicating pipe is three-way pipe structure, and it is provided with the first end be connected with described gas channel, the second end be connected with described first detection piece, the 3rd end be connected with described second detection piece.
4. control system as claimed in claim 3, is characterized in that: the radical of described three-way pipe is one,
Described first detection piece is provided with the first detection mouth, second and detects mouth, and described first detects mouth is connected with the negative pressure cavity of described gas-fired water heater, and described second detects mouth is connected with described second end;
Described second detection piece is provided with the 3rd and detects mouth, the 4th detection mouth, and the described 3rd detects mouth is connected with the negative pressure cavity of described gas-fired water heater, and the described 4th detects mouth is connected with described 3rd end.
5. control system as claimed in claim 3, is characterized in that: the radical of described three-way pipe is two, is respectively the first three-way pipe and the second three-way pipe,
Be provided with the Venturi tube for pressure in described gas channel, described Venturi tube is provided with negative pressure acquisition port;
Along gas flow direction, the first end of described first three-way pipe is communicated with the Upstream section of the negative pressure acquisition port of pipe in civilian district, and the first end of described second three-way pipe is connected with the negative pressure acquisition port of described Venturi tube;
Described first detection piece is provided with the first detection mouth, second and detects mouth, and described first detects mouth is connected with the second end of described first three-way pipe, and described second detects mouth is connected with the second end of described second three-way pipe;
Described second detection piece is provided with the 3rd and detects mouth, the 4th detection mouth, and described 3rd detection piece is connected with the 3rd end of described first three-way pipe, and the described 4th detects mouth is connected with the 3rd end of described second three-way pipe.
6. control system as claimed in claim 3, it is characterized in that: first end, second end, the 3rd of described communicating pipe have interconnecting part, described interconnecting part, lower than the position of described first detection piece, the second detection piece, is provided with the device for storing liquid that can store hydrops at described interconnecting part.
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| CN201520856561.1U CN205090630U (en) | 2015-10-29 | 2015-10-29 | Gas hot water system's control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107014088A (en) * | 2017-04-13 | 2017-08-04 | 珠海格力电器股份有限公司 | A kind of ignition protection method and system of gas water-heating furnace |
| CN107490196A (en) * | 2017-07-21 | 2017-12-19 | 中山华帝电子科技有限公司 | A kind of ignition control method of the gas constant-temp. water heater with rotation speed of fan feedback |
| CN107504690A (en) * | 2017-07-21 | 2017-12-22 | 中山华帝电子科技有限公司 | A kind of ignition control method of the gas constant-temp. water heater with wind pressure sensor |
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| CN111397214A (en) * | 2019-01-03 | 2020-07-10 | 芜湖美的厨卫电器制造有限公司 | Gas water heater and control method thereof |
| CN111735212A (en) * | 2020-07-27 | 2020-10-02 | 珠海格力电器股份有限公司 | Gas water heater, control method and device of gas water heater and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107014088A (en) * | 2017-04-13 | 2017-08-04 | 珠海格力电器股份有限公司 | A kind of ignition protection method and system of gas water-heating furnace |
| CN107490196A (en) * | 2017-07-21 | 2017-12-19 | 中山华帝电子科技有限公司 | A kind of ignition control method of the gas constant-temp. water heater with rotation speed of fan feedback |
| CN107504690A (en) * | 2017-07-21 | 2017-12-22 | 中山华帝电子科技有限公司 | A kind of ignition control method of the gas constant-temp. water heater with wind pressure sensor |
| CN111397214A (en) * | 2019-01-03 | 2020-07-10 | 芜湖美的厨卫电器制造有限公司 | Gas water heater and control method thereof |
| CN110220244A (en) * | 2019-05-14 | 2019-09-10 | 深圳市合信达控制系统有限公司 | A kind of method, system and burnt gas wall hanging furnace improving efficiency of combustion |
| CN111735212A (en) * | 2020-07-27 | 2020-10-02 | 珠海格力电器股份有限公司 | Gas water heater, control method and device of gas water heater and storage medium |
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