CN109028593B - Air-fuel ratio control method and device for gas heating water heater and gas heating water heater - Google Patents

Air-fuel ratio control method and device for gas heating water heater and gas heating water heater Download PDF

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CN109028593B
CN109028593B CN201810556245.0A CN201810556245A CN109028593B CN 109028593 B CN109028593 B CN 109028593B CN 201810556245 A CN201810556245 A CN 201810556245A CN 109028593 B CN109028593 B CN 109028593B
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water heater
heating water
main controller
actual
gas heating
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CN109028593A (en
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卢楚鹏
孙云帆
杨礼佩
梁展程
付志冈
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Guangdong Wanhe Thermal Energy Technology Co Ltd
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Guangdong Wanhe Thermal Energy Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
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  • Combustion & Propulsion (AREA)
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  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

The invention relates to a method and a device for controlling air-fuel ratio of a gas heating water heater and the gas heating water heater. According to the air-fuel ratio control method of the gas heating water heater, different preset secondary pressures correspond to different loads of different gas heating water heaters, if the actual secondary pressure of the gas heating water heater is detected by the gas secondary pressure feedback module and is not matched with the preset secondary pressure, the main controller instructs the fan control module to control the speed regulation fan to work at the first preset rotating speed corresponding to the actual secondary pressure, air distribution is completed according to the actual secondary pressure, and therefore the air-fuel ratio is maintained in a proper range. If the gas secondary pressure feedback module detects that the actual secondary pressure of the gas heating water heater is matched with the preset secondary pressure, the main controller instructs the fan control module to control the speed regulation fan to work at a second preset rotating speed corresponding to the load of the gas heating water heater, and air distribution is completed according to the load of the gas heating water heater, so that the air-fuel ratio is maintained in a proper range.

Description

Air-fuel ratio control method and device for gas heating water heater and gas heating water heater
Technical Field
The invention relates to the technical field of gas heating water heaters, in particular to a method and a device for controlling the air-fuel ratio of a gas heating water heater and the gas heating water heater.
Background
As the gas heating water heater goes into thousands of households, the problem of air exhaust by using the alternating-current single-phase asynchronous fan is gradually highlighted. Most of the exhaust smoke pipes of gas heating water heaters have simple structures, and the used alternating-current single-phase asynchronous fan has fixed rotating speed and always keeps constant air speed for exhaust. In the in-service use process, to installing the gas heating water heater in the changeable external environment of high pressure, adopt original not adjustable rotational speed's single-phase asynchronous fan of interchange to be difficult to adapt to abominable service environment, take place the flue easily and block up, produce a large amount of waste gas backward flows, cause flame excessive even, the adaptability of product is not good. In addition, when the gas-fired water heater is used, the problem of insufficient or overhigh secondary pressure of gas is also faced, so that the phenomenon of flame separation or yellow fire and the like of the gas-fired water heater is caused, and the heat efficiency of the gas-fired water heater is influenced.
In contrast, the gas heating water heater using the speed-regulating fan has better adaptability to the environment. Therefore, how to maintain the operation of the gas heating water heater using the speed-regulating fan under a better working condition is an urgent problem to be solved.
Disclosure of Invention
Based on this, the first technical problem to be solved by the present invention is to provide a method and a device for controlling the air-fuel ratio of a gas-fired heating water heater, which can effectively maintain the gas-fired heating water heater using a speed-adjustable fan to operate under a better working condition.
The second technical problem to be solved by the present invention is to provide a gas-fired water heater, which can operate under a better working condition.
The first technical problem is solved by the following technical scheme:
a method for controlling the air-fuel ratio of a gas heating water heater comprises the following steps:
s100: the main controller acquires the load of the gas heating water heater;
s200: the main controller indicates the proportional valve control module to control the gas proportional valve to work at a preset current according to the load of the gas heating water heater;
s300: the main controller indicates the gas secondary pressure feedback module to detect the actual secondary pressure of the gas heating water heater;
s400: the main controller compares the actual secondary pressure with a preset secondary pressure corresponding to the load of the gas heating water heater, and if the actual secondary pressure is not matched with the preset secondary pressure, the scheme A is executed; if the actual secondary pressure is matched with the preset secondary pressure, executing the scheme B;
the scheme A comprises the following steps:
s1100: the main controller indicates the fan control module to control the speed-regulating fan to work at a first preset rotating speed according to the actual secondary pressure;
the scheme B comprises the following steps:
s2100: the main controller indicates the fan control module to control the speed regulation fan to work at a second preset rotating speed according to the load of the gas heating water heater.
Compared with the background technology, the air-fuel ratio control method of the gas heating water heater has the following beneficial effects: in the actual use process, the main controller indicates the proportional valve control module to control the gas proportional valve to work at the preset current according to the load of the gas heating water heater. The load of different gas heating water heaters corresponds has different preset secondary pressure, if the actual secondary pressure that gas heating water heater was detected to gas secondary pressure feedback module does not match with preset secondary pressure, main control unit instructs fan control module control speed governing fan this moment and in order to press the first rotational speed work of predetermineeing that corresponds with the actual secondary, accomplishes the air distribution according to actual secondary pressure to maintain the air-fuel ratio in suitable scope. If the gas secondary pressure feedback module detects that the actual secondary pressure of the gas heating water heater is matched with the preset secondary pressure, the main controller instructs the fan control module to control the speed regulation fan to work at a second preset rotating speed corresponding to the load of the gas heating water heater, and air distribution is completed according to the load of the gas heating water heater, so that the air-fuel ratio is maintained in a proper range. So can maintain gas heating water heater and move under the operating mode of preferred, and then guarantee that gas heating water heater has higher thermal efficiency.
In one embodiment, the method for controlling the air-fuel ratio of the gas-fired water heater further includes, after S1100, the following steps:
s1200: the main controller indicates the wind pressure feedback module to detect the actual wind pressure generated by the speed-regulating fan;
s1300: the main controller compares the actual wind pressure with a first preset wind pressure corresponding to the first preset rotating speed, and if the actual wind pressure is not matched with the first preset wind pressure, the main controller instructs the fan control module to control the speed regulation fan to work at the first set rotating speed so as to match the actual wind pressure with the first preset wind pressure.
The size of wind pressure is decided by the speed of rotational speed, if the influence that actual wind pressure received external environment is too big, then the wind pressure feedback module detects the actual wind pressure that the speed governing fan produced and can not match with first predetermined wind pressure, and main control unit instructs the fan control module control speed governing fan to work with first settlement rotational speed this moment for actual wind pressure matches with first predetermined wind pressure, thereby maintains the air-fuel ratio in suitable scope. So can improve the adaptability of gas heating water heater to the environment, and then guarantee that gas heating water heater has higher thermal efficiency.
In one embodiment, the method for controlling the air-fuel ratio of the gas-fired water heater further includes, after S1300, the following steps:
s1500: the main controller acquires the load of the gas heating water heater;
s1600: the main controller indicates the proportional valve control module to control the gas proportional valve to work at a preset current according to the load of the gas heating water heater;
s1700: the main controller compares the preset current with the maximum limiting current and the minimum limiting current, and if the preset current is smaller than the maximum limiting current of the gas proportional valve and is larger than the minimum limiting current of the gas proportional valve, the S1800a is executed1And S1800a2；
S1800a1: the main controller indicates the gas secondary pressure feedback module to detect the actual secondary pressure of the gas heating water heater;
S1800a2: and the main controller compares the actual secondary pressure with a preset secondary pressure corresponding to the load of the gas heating water heater, and if the actual secondary pressure is matched with the preset secondary pressure, the scheme B is executed.
After the main controller instructs the fan control module to control the speed regulation fan to work at a first set rotating speed, the main controller acquires the load of the gas heating water heater again and controls the gas proportional valve to work at a corresponding preset current, at the moment, if the preset current is smaller than the maximum limiting current of the gas proportional valve, and the preset current is larger than the minimum limiting current of the gas proportional valve, the main controller instructs the gas secondary pressure feedback module to detect the actual secondary pressure of the gas heating water heater again, if the actual secondary pressure is matched with the preset secondary pressure corresponding to the load of the gas heating water heater, the mode of distributing air according to the load of the gas heating water heater is adopted instead of the mode of distributing air according to the actual secondary pressure, and the gas heating water heater is enabled to run more stably.
In one embodiment, the method for controlling the air-fuel ratio of the gas-fired water heater further includes, after S1300, the following steps:
s1500: the main controller acquires the load of the gas heating water heater;
s1600: the main controller indicates the proportional valve control module to control the gas proportional valve to work at a preset current according to the load of the gas heating water heater;
s1700: the main controller compares the preset current with the maximum limit current and the minimum limit current, and if the preset current is greater than the maximum limit current of the gas proportional valve or the preset current is less than the minimum limit current of the gas proportional valve, the S1800b is executed1And S1800b2；
S1800b1: the main controller indicates the gas secondary pressure feedback module to detect the actual secondary pressure of the gas heating water heater;
S1800b2: the main controller compares the actual secondary pressure with the maximum limit secondary pressure and the minimum limit secondary pressure, and if the actual secondary pressure is greater than the maximum limit secondary pressure of the gas heating water heater or the actual secondary pressure is less than the minimum limit secondary pressure of the gas heating water heater, S1900 is executed;
s1900: the main controller compares the load of the gas heating water heater with the maximum limit load and the minimum limit load, and if the load of the gas heating water heater is larger than the maximum limit load of the gas heating water heater or the load of the gas heating water heater is smaller than the minimum limit load of the gas heating water heater, the main controller indicates the alarm mechanism to give a prompt.
After the main controller instructs the fan control module to control the speed regulation fan to work at a first set rotating speed, the main controller acquires the load of the gas heating water heater again and controls the gas proportional valve to work at a corresponding preset current, at the moment, if the preset current is greater than the maximum limit current of the gas proportional valve or the preset current is less than the minimum limit current of the gas proportional valve, the main controller instructs the gas secondary pressure feedback module to detect the actual secondary pressure of the gas heating water heater again, at the moment, if the actual secondary pressure is greater than the maximum limit secondary pressure of the gas heating water heater or the actual secondary pressure is less than the minimum limit secondary pressure of the gas heating water heater, the alarm mechanism gives a prompt. Therefore, the purpose of reminding the user can be achieved, the gas heating water heater is prevented from working under overload or low load, and the working safety of the gas heating water heater is guaranteed.
In one embodiment, the method for controlling the air-fuel ratio of the gas-fired heating water heater according to the scheme a further includes the following steps after S1300 and before S1500:
S1400a1: the main controller indicates a rotating speed feedback module to detect the actual rotating speed of the speed-regulating fan;
S1400a2: the main controller compares the actual rotating speed with the first set rotating speed, and if the actual rotating speed is not matched with the first set rotating speed, the main controller indicates the alarm mechanism to give out a prompt.
Under the abnormal conditions such as speed governing fan damage or ageing, main control unit instructs fan control module control speed governing fan with first settlement rotational speed during operation speed governing fan probably can't reach corresponding first settlement rotational speed, and utilize rotational speed feedback module to detect the actual rotational speed of speed governing fan and compare actual rotational speed and first settlement rotational speed through main control unit, if actual rotational speed does not match with first settlement rotational speed, then alarm mechanism sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In one embodiment, the method for controlling the air-fuel ratio of the gas-fired heating water heater according to the scheme a further includes the following steps after S1300 and before S1600:
S1400b1: the main controller indicates the wind pressure feedback module to detect the actual wind pressure generated by the speed-regulating fan;
S1400b2: the main controller compares the actual wind pressure with the first preset wind pressure, and if the actual wind pressure is not matched with the first preset wind pressure, the main controller compares the actual wind pressure with the first preset wind pressureThe main controller instructs the alarm mechanism to give out prompt.
Under special circumstances such as speed governing fan with limit speed work, the first wind pressure of predetermineeing still can't be produced to actual wind pressure, and utilize wind pressure feedback module to detect the actual wind pressure that the speed governing fan produced and compare actual wind pressure and first wind pressure of predetermineeing through main control unit, if actual wind pressure is unmatched with first wind pressure of predetermineeing, then alarm mechanism sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In one embodiment, the method for controlling the air-fuel ratio of the gas-heating water heater, after S2100, further includes the following steps:
s2200: the main controller indicates the wind pressure feedback module to detect the actual wind pressure generated by the speed-regulating fan;
s2300: the main controller compares the actual wind pressure with a second preset wind pressure corresponding to the second preset rotating speed, and if the actual wind pressure is not matched with the second preset wind pressure, the main controller instructs the fan control module to control the speed regulation fan to work at the second preset rotating speed so that the actual wind pressure is matched with the second preset wind pressure.
The size of wind pressure is decided by the speed of rotational speed, if the influence that actual wind pressure received external environment is too big, then wind pressure feedback module detects the actual wind pressure that the speed governing fan produced and predetermines the wind pressure with the second and can not match, and main control unit instructs the fan control module control speed governing fan to set for the rotational speed work with the second this moment for the wind pressure is predetermine with the second to actual wind pressure and is matchd, thereby maintains the air-fuel ratio in suitable scope. So can improve the adaptability of gas heating water heater to the environment, and then guarantee that gas heating water heater has higher thermal efficiency.
In one embodiment, the method for controlling the air-fuel ratio of the gas heating water heater, after S2300, according to the scheme B, further includes the following steps:
S2400a1: the main controller indicates a rotating speed feedback module to detect the actual rotating speed of the speed-regulating fan;
S2400a2: master and slaveThe controller compares the actual rotating speed with the second set rotating speed, and if the actual rotating speed is not matched with the second set rotating speed, the main controller indicates the alarm mechanism to give out a prompt.
Under the abnormal conditions such as speed governing fan damage or ageing, main control unit instructs fan control module control speed governing fan to set for the rotational speed during operation speed governing fan probably can't reach corresponding second with the second and sets for the rotational speed, and utilize rotational speed feedback module to detect the actual rotational speed of speed governing fan and set for the rotational speed with the second through main control unit comparison actual rotational speed, if actual rotational speed and second set for the rotational speed and mismatch, then alarm mechanism sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In one embodiment, the method for controlling the air-fuel ratio of the gas heating water heater, after S2300, according to the scheme B, further includes the following steps:
S2400b1: the main controller indicates the wind pressure feedback module to detect the actual wind pressure generated by the speed-regulating fan;
S2400b2: the main controller compares the actual wind pressure with the second preset wind pressure, and if the actual wind pressure is not matched with the second preset wind pressure, the main controller indicates the alarm mechanism to send a prompt.
Under special circumstances such as speed governing fan with limit speed work, the second is predetermine the wind pressure still probably can't be produced to actual wind pressure, and utilize wind pressure feedback module to detect the actual wind pressure that the speed governing fan produced and compare actual wind pressure and the second through main control unit and predetermine the wind pressure, if actual wind pressure is not matched with the second and predetermine the wind pressure, then alarm mechanism sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In one embodiment, before S100, the air-fuel ratio control method for a gas-fired water heater further includes the following steps:
s10: the main controller instructs the fan control module to control the speed-regulating fan to work at a test rotating speed;
s20: the main controller indicates the wind pressure feedback module to detect the actual wind pressure generated by the speed-regulating fan;
s30: the main controller compares the actual wind pressure with the test wind pressure, and if the actual wind pressure is not matched with the test wind pressure, the main controller indicates the alarm mechanism to send a prompt.
Under the abnormal conditions such as speed governing fan damage or ageing, main control unit instructs fan control module control speed governing fan probably can't produce the test wind pressure with test rotational speed during operation speed governing fan, and utilize wind pressure feedback module to detect the actual wind pressure that the speed governing fan produced and compare actual wind pressure and test wind pressure through main control unit, if actual wind pressure and test wind pressure do not match, then alarm mechanism sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
The air-fuel ratio control device of the gas heating water heater comprises a main controller, a fan control module, a proportional valve control module and a gas secondary pressure feedback module, wherein the fan control module, the proportional valve control module and the wind pressure feedback module are respectively and electrically connected with the main controller;
the main controller is used for acquiring the load of the gas heating water heater, and is also used for indicating the proportional valve control module to control the gas proportional valve to work at a preset current according to the load of the gas heating water heater;
the main controller is also used for indicating the gas secondary pressure feedback module to detect the actual secondary pressure of the gas heating water heater;
the main controller is also used for comparing the actual secondary pressure with a preset secondary pressure corresponding to the load of the gas heating water heater, and if the actual secondary pressure is not matched with the preset secondary pressure, the main controller indicates the fan control module to control the speed-regulating fan to work at a first preset rotating speed according to the actual secondary pressure; and if the actual secondary pressure is matched with the preset secondary pressure, the main controller instructs the fan control module to control the speed-regulating fan to work at a second preset rotating speed according to the load of the gas heating water heater.
Compared with the background technology, the air-fuel ratio control device of the gas heating water heater has the following beneficial effects: in the actual use process, the main controller indicates the proportional valve control module to control the gas proportional valve to work at the preset current according to the load of the gas heating water heater. The load of different gas heating water heaters corresponds has different preset secondary pressure, if the actual secondary pressure that gas heating water heater was detected to gas secondary pressure feedback module does not match with preset secondary pressure, main control unit instructs fan control module control speed governing fan this moment and in order to press the first rotational speed work of predetermineeing that corresponds with the actual secondary, accomplishes the air distribution according to actual secondary pressure to maintain the air-fuel ratio in suitable scope. If the gas secondary pressure feedback module detects that the actual secondary pressure of the gas heating water heater is matched with the preset secondary pressure, the main controller instructs the fan control module to control the speed regulation fan to work at a second preset rotating speed corresponding to the load of the gas heating water heater, and air distribution is completed according to the load of the gas heating water heater, so that the air-fuel ratio is maintained in a proper range. So can maintain gas heating water heater and move under the operating mode of preferred, and then guarantee that gas heating water heater has higher thermal efficiency.
In one embodiment, the air-fuel ratio control device of the gas heating water heater further comprises a wind pressure feedback module, and the wind pressure feedback module is electrically connected with the main controller;
the main controller is also used for indicating the wind pressure feedback module to detect the actual wind pressure generated by the speed-regulating fan;
the main control unit is still used for comparing actual wind pressure with the first predetermined wind pressure that corresponds with the first predetermined rotational speed, if actual wind pressure does not match with the first predetermined wind pressure, then main control unit instructs fan control module control speed governing fan to work with first settlement rotational speed so that actual wind pressure matches with the first predetermined wind pressure.
The size of wind pressure is decided by the speed of rotational speed, if the influence that actual wind pressure received external environment is too big, then the wind pressure feedback module detects the actual wind pressure that the speed governing fan produced and can not match with first predetermined wind pressure, and main control unit instructs the fan control module control speed governing fan to work with first settlement rotational speed this moment for actual wind pressure matches with first predetermined wind pressure, thereby maintains the air-fuel ratio in suitable scope. So can improve the adaptability of gas heating water heater to the environment, and then guarantee that gas heating water heater has higher thermal efficiency.
In one embodiment, the main controller is further configured to compare a preset current with a maximum limit current and a minimum limit current, and if the preset current is smaller than the maximum limit current of the gas proportional valve and is greater than the minimum limit current of the gas proportional valve, the main controller instructs the gas secondary pressure feedback module to detect an actual secondary pressure of the gas heating water heater, compares the actual secondary pressure with a preset secondary pressure corresponding to a load of the gas heating water heater, and if the actual secondary pressure is matched with the preset secondary pressure, the main controller instructs the fan control module to control the speed regulation fan to operate at a second preset rotation speed according to the load of the gas heating water heater.
After the main controller instructs the fan control module to control the speed regulation fan to work at a first set rotating speed, the main controller acquires the load of the gas heating water heater again and controls the gas proportional valve to work at a corresponding preset current, at the moment, if the preset current is smaller than the maximum limiting current of the gas proportional valve, and the preset current is larger than the minimum limiting current of the gas proportional valve, the main controller instructs the gas secondary pressure feedback module to detect the actual secondary pressure of the gas heating water heater again, if the actual secondary pressure is matched with the preset secondary pressure corresponding to the load of the gas heating water heater, the mode of distributing air according to the load of the gas heating water heater is adopted instead of the mode of distributing air according to the actual secondary pressure, and the gas heating water heater is enabled to run more stably.
In one embodiment, the air-fuel ratio control device of the gas heating water heater further comprises an alarm mechanism, and the alarm mechanism is electrically connected with the main controller;
the main controller is also used for comparing the preset current with the maximum limit current and the minimum limit current, if the preset current is larger than the maximum limit current of the gas proportional valve or the preset current is smaller than the minimum limit current of the gas proportional valve, the main controller indicates the gas secondary pressure feedback module to detect the actual secondary pressure of the gas heating water heater, the main controller compares the actual secondary pressure with the maximum limit secondary pressure and the minimum limit secondary pressure, if the actual secondary pressure is larger than the maximum limit secondary pressure of the gas heating water heater or the actual secondary pressure is smaller than the minimum limit secondary pressure of the gas heating water heater, the main controller compares the load of the gas heating water heater with the maximum limit load and the minimum limit load, if the load of the gas heating water heater is larger than the maximum limit load of the gas heating water heater or the load of the gas heating water heater is smaller than the minimum limit load of the gas heating water heater, the main controller instructs the alarm mechanism to send out a prompt.
After the main controller instructs the fan control module to control the speed regulation fan to work at a first set rotating speed, the main controller acquires the load of the gas heating water heater again and controls the gas proportional valve to work at a corresponding preset current, at the moment, if the preset current is greater than the maximum limit current of the gas proportional valve or the preset current is less than the minimum limit current of the gas proportional valve, the main controller instructs the gas secondary pressure feedback module to detect the actual secondary pressure of the gas heating water heater again, at the moment, if the actual secondary pressure is greater than the maximum limit secondary pressure of the gas heating water heater or the actual secondary pressure is less than the minimum limit secondary pressure of the gas heating water heater, the alarm mechanism gives a prompt. Therefore, the overload or low-load operation of the gas heating water heater can be prevented, and the working safety of the gas heating water heater can be ensured.
In one embodiment, the air-fuel ratio control device of the gas heating water heater further comprises a rotating speed feedback module and an alarm mechanism, wherein the rotating speed feedback module and the alarm mechanism are respectively and electrically connected with the main controller;
the main controller is also used for indicating the rotating speed feedback module to detect the actual rotating speed of the speed-regulating fan;
the main controller is further used for comparing the actual rotating speed with the first set rotating speed, and if the actual rotating speed is not matched with the first set rotating speed, the main controller indicates the alarm mechanism to send out a prompt.
Under the abnormal conditions such as speed governing fan damage or ageing, main control unit instructs fan control module control speed governing fan with first settlement rotational speed during operation speed governing fan probably can't reach corresponding first settlement rotational speed, and utilize rotational speed feedback module to detect the actual rotational speed of speed governing fan and compare actual rotational speed and first settlement rotational speed through main control unit, if actual rotational speed does not match with first settlement rotational speed, then alarm mechanism sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In one embodiment, the air-fuel ratio control device of the gas heating water heater further comprises an alarm mechanism, and the alarm mechanism is electrically connected with the main controller;
the main control unit is also used for comparing the actual wind pressure with the first preset wind pressure, and if the actual wind pressure is not matched with the first preset wind pressure, the main control unit indicates the alarm mechanism to send a prompt.
Under special circumstances such as speed governing fan with limit speed work, the first wind pressure of predetermineeing still can't be produced to actual wind pressure, and utilize wind pressure feedback module to detect the actual wind pressure that the speed governing fan produced and compare actual wind pressure and first wind pressure of predetermineeing through main control unit, if actual wind pressure is unmatched with first wind pressure of predetermineeing, then alarm mechanism sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In one embodiment, the air-fuel ratio control device of the gas heating water heater further comprises a wind pressure feedback module, and the wind pressure feedback module is electrically connected with the main controller;
the main controller is also used for indicating the wind pressure feedback module to detect the actual wind pressure generated by the speed-regulating fan;
the main control unit is also used for comparing the actual wind pressure with the second preset wind pressure corresponding to the second preset rotating speed, and if the actual wind pressure is not matched with the second preset wind pressure, the main control unit indicates the fan control module to control the speed regulation fan to work at the second preset rotating speed so as to enable the actual wind pressure to be matched with the second preset wind pressure.
The size of wind pressure is decided by the speed of rotational speed, if the influence that actual wind pressure received external environment is too big, then wind pressure feedback module detects the actual wind pressure that the speed governing fan produced and predetermines the wind pressure with the second and can not match, and main control unit instructs the fan control module control speed governing fan to set for the rotational speed work with the second this moment for the wind pressure is predetermine with the second to actual wind pressure and is matchd, thereby maintains the air-fuel ratio in suitable scope. So can improve the adaptability of gas heating water heater to the environment, and then guarantee that gas heating water heater has higher thermal efficiency.
In one embodiment, the air-fuel ratio control device of the gas heating water heater further comprises a rotating speed feedback module and an alarm mechanism, wherein the rotating speed feedback module and the alarm mechanism are respectively and electrically connected with the main controller;
the main controller is also used for indicating the rotating speed feedback module to detect the actual rotating speed of the speed-regulating fan;
the main controller is also used for comparing the actual rotating speed with the second set rotating speed, and if the actual rotating speed is not matched with the second set rotating speed, the main controller indicates the alarm mechanism to send a prompt.
Under the abnormal conditions such as speed governing fan damage or ageing, main control unit instructs fan control module control speed governing fan to set for the rotational speed during operation speed governing fan probably can't reach corresponding second with the second and sets for the rotational speed, and utilize rotational speed feedback module to detect the actual rotational speed of speed governing fan and set for the rotational speed with the second through main control unit comparison actual rotational speed, if actual rotational speed and second set for the rotational speed and mismatch, then alarm mechanism sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In one embodiment, the air-fuel ratio control device of the gas heating water heater further comprises an alarm mechanism, and the alarm mechanism is electrically connected with the main controller;
the main control unit is also used for comparing the actual wind pressure with the second preset wind pressure, and if the actual wind pressure is not matched with the second preset wind pressure, the main control unit indicates the alarm mechanism to send a prompt.
Under special circumstances such as speed governing fan with limit speed work, the second is predetermine the wind pressure still probably can't be produced to actual wind pressure, and utilize wind pressure feedback module to detect the actual wind pressure that the speed governing fan produced and compare actual wind pressure and the second through main control unit and predetermine the wind pressure, if actual wind pressure is not matched with the second and predetermine the wind pressure, then alarm mechanism sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In one embodiment, the air-fuel ratio control device of the gas heating water heater further comprises an alarm mechanism, and the alarm mechanism is electrically connected with the main controller;
the main controller is also used for indicating the fan control module to control the speed-regulating fan to work at a test rotating speed;
the main control unit is also used for comparing the actual wind pressure with the test wind pressure, and if the actual wind pressure is not matched with the test wind pressure, the main control unit indicates the alarm mechanism to send a prompt.
Under the abnormal conditions such as speed governing fan damage or ageing, main control unit instructs fan control module control speed governing fan probably can't produce the test wind pressure with test rotational speed during operation speed governing fan, and utilize wind pressure feedback module to detect the actual wind pressure that the speed governing fan produced and compare actual wind pressure and test wind pressure through main control unit, if actual wind pressure and test wind pressure do not match, then alarm mechanism sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In one embodiment, the wind pressure feedback module comprises a wind pressure sensor electrically connected to the main controller, so as to detect the actual wind pressure generated by the speed-adjustable fan.
In one embodiment, the alarm mechanism comprises a sound module and a display module, the sound module and the display module are respectively electrically connected with the main controller, the sound module is used for sending out alarm ring tones, and the display module is used for displaying fault codes, so that the prompt effect is good.
The second technical problem is solved by the following technical solutions:
the gas heating water heater comprises a speed regulation fan, a gas proportional valve and the gas-fuel ratio control device of the gas heating water heater, wherein the speed regulation fan is electrically connected with a fan control module, and the gas proportional valve is electrically connected with a proportional valve control module.
Compared with the background technology, the gas heating water heater of the invention has the following beneficial effects: in the actual use process, the main controller indicates the proportional valve control module to control the gas proportional valve to work at the preset current according to the load of the gas heating water heater. The load of different gas heating water heaters corresponds has different preset secondary pressure, if the actual secondary pressure that gas heating water heater was detected to gas secondary pressure feedback module does not match with preset secondary pressure, main control unit instructs fan control module control speed governing fan this moment and in order to press the first rotational speed work of predetermineeing that corresponds with the actual secondary, accomplishes the air distribution according to actual secondary pressure to maintain the air-fuel ratio in suitable scope. If the gas secondary pressure feedback module detects that the actual secondary pressure of the gas heating water heater is matched with the preset secondary pressure, the main controller instructs the fan control module to control the speed regulation fan to work at a second preset rotating speed corresponding to the load of the gas heating water heater, and air distribution is completed according to the load of the gas heating water heater, so that the air-fuel ratio is maintained in a proper range. So can maintain the operation under the operating mode of preferred, and then guarantee to have higher thermal efficiency.
In one embodiment, the gas heating water heater further comprises a switch power supply, and the speed regulation fan is connected with an external power supply through the switch power supply, so that the gas heating water heater is convenient to use.
Drawings
Fig. 1 is a schematic flow chart of a method for controlling an air-fuel ratio of a gas heating water heater according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a scheme A according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an air-fuel ratio control device of a gas heating water heater according to an embodiment of the present invention.
Description of reference numerals:
10. the device comprises a main controller, 20, a proportional valve control module, 30, a gas proportional valve, 40, a gas secondary pressure feedback module, 50, a fan control module, 60, a speed regulation fan, 70, a wind pressure feedback module, 80, a rotating speed feedback module, 90 and an alarm mechanism.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the method for controlling the air-fuel ratio of the gas-fired heating water heater according to the embodiment includes the following steps:
in one embodiment, before S100, the air-fuel ratio control method for a gas-fired water heater further includes the following steps:
s10: the main controller 10 instructs the fan control module 50 to control the governor fan 60 to operate at the test speed.
S20: the main controller 10 instructs the wind pressure feedback module 70 to detect the actual wind pressure generated by the governor fan 60.
S30: the main controller 10 compares the actual wind pressure with the test wind pressure, and if the actual wind pressure is not matched with the test wind pressure, the main controller 10 instructs the alarm mechanism 90 to give a prompt. Meanwhile, if the actual wind pressure is not matched with the test wind pressure, the main controller 10 may also instruct the gas heating water heater closing mechanism to operate. And if the actual wind pressure is matched with the test wind pressure, executing S100.
The beneficial effects produced by S10, S20 and S30 are as follows: under the abnormal conditions such as speed governing fan 60 damages or ageing, main control unit 10 instructs speed governing fan 60 control speed governing fan control module 50 probably can't produce the test wind pressure with test rotational speed during operation speed governing fan 60, and utilize wind pressure feedback module 70 to detect the actual wind pressure that speed governing fan 60 produced and compare actual wind pressure and test wind pressure through main control unit 10, if actual wind pressure and test wind pressure do not match, alarm mechanism 90 sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater. Meanwhile, the main controller 10 instructs the gas heating water heater closing mechanism to operate, so that the gas heating water heater can be prevented from operating under abnormal conditions, and the working safety of the gas heating water heater can be guaranteed.
S100: the main controller 10 acquires the load of the gas heating water heater.
S200: the main controller 10 instructs the proportional valve control module 20 to control the gas proportional valve 30 to operate at a preset current according to the load of the gas heating water heater.
S300: the main controller 10 instructs the gas secondary pressure feedback module 40 to detect the actual secondary pressure of the gas heating water heater.
S400: the main controller 10 compares the actual secondary pressure with a preset secondary pressure corresponding to the load of the gas heating water heater, and if the actual secondary pressure is not matched with the preset secondary pressure, the scheme a is executed; and if the actual secondary pressure is matched with the preset secondary pressure, executing the scheme B.
The scheme A comprises the following steps:
s1000: the main controller 10 instructs the gas secondary pressure feedback module 40 to detect the actual secondary pressure of the gas heating water heater.
S1100: the main controller 10 controls the speed-adjusting fan 60 to work at a first preset rotating speed according to the actual secondary pressure indication fan control module 50.
S1200: the main controller 10 instructs the wind pressure feedback module 70 to detect the actual wind pressure generated by the governor fan 60.
S1300: the main controller 10 compares the actual wind pressure with a first preset wind pressure corresponding to a first preset rotational speed, and if the actual wind pressure is not matched with the first preset wind pressure, the main controller 10 instructs the fan control module 50 to control the speed-adjusting fan 60 to work at a first set rotational speed so that the actual wind pressure is matched with the first preset wind pressure. And if the actual wind pressure is matched with the first preset wind pressure, re-executing S1000.
The beneficial effects of S1200 and S1300 are as follows: the size of wind pressure is decided by the speed of rotational speed, if the influence that actual wind pressure received external environment is too big, then wind pressure feedback module 70 detects the actual wind pressure that speed governing fan 60 produced and can not match with first predetermined wind pressure, and main control unit 10 instructs fan control module 50 control speed governing fan 60 to work with first settlement rotational speed this moment for actual wind pressure matches with first predetermined wind pressure, thereby maintains the air-fuel ratio in suitable scope. So can improve the adaptability of gas heating water heater to the environment, and then guarantee that gas heating water heater has higher thermal efficiency.
S1400a1: the main controller 10 instructs the speed feedback module 80 to detect the actual speed of the governor fan 60.
S1400a2: the main controller 10 sets the actual rotation speed to the first set rotation speedIf the actual rotation speed is not matched with the first set rotation speed, the main controller 10 instructs the alarm mechanism 90 to send a prompt. Meanwhile, if the actual rotation speed is not matched with the first set rotation speed, the main controller 10 may also instruct the gas heating water heater closing mechanism to operate. If the actual rotation speed matches the first set rotation speed, S1500 is executed.
S1400a1、S1400a2The beneficial effects are as follows: under the abnormal conditions such as the speed regulation fan 60 damages or ages, main controller 10 instructs fan control module 50 to control speed regulation fan 60 and perhaps can't reach corresponding first settlement rotational speed when working with first settlement rotational speed, and utilize rotational speed feedback module 80 to detect the actual rotational speed of speed regulation fan 60 and compare actual rotational speed and first settlement rotational speed through main controller 10, if actual rotational speed and first settlement rotational speed do not match, alarm mechanism 90 sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater and lead to the flue to block up, improve the life of gas heating water heater. Meanwhile, the main controller 10 instructs the gas heating water heater closing mechanism to operate, so that the gas heating water heater can be prevented from operating under abnormal conditions, and the working safety of the gas heating water heater can be guaranteed.
S1400b1: the main controller 10 instructs the wind pressure feedback module 70 to detect the actual wind pressure generated by the governor fan 60.
S1400b2: the main controller 10 compares the actual wind pressure with the first preset wind pressure, and if the actual wind pressure is not matched with the first preset wind pressure, the main controller 10 instructs the alarm mechanism 90 to send a prompt. Meanwhile, if the actual wind pressure is not matched with the first preset wind pressure, the main controller 10 may also instruct the gas heating water heater closing mechanism to operate. And if the actual wind pressure is matched with the first preset wind pressure, executing S1500.
S1400b1、S1400b2The beneficial effects are as follows: under special conditions such as the speed-adjustable fan 60 working at the limit speed, the actual wind pressure may not be able to generate the first preset wind pressure, and the wind pressure feedback module 70 is used to detect the actual wind pressure generated by the speed-adjustable fan 60 and compare the actual wind pressure with the third wind pressure by the main controller 10A predetermine the wind pressure, if the actual wind pressure does not match with first predetermined wind pressure, then alarm mechanism 90 sends the suggestion, can play the purpose of reminding the user like this, avoids continuing to use gas heating water heater to lead to the flue to block up, improves the life of gas heating water heater. Meanwhile, the main controller 10 instructs the gas heating water heater closing mechanism to operate, so that the gas heating water heater can be prevented from operating under abnormal conditions, and the working safety of the gas heating water heater can be guaranteed.
In the present embodiment, for S1400a1、S1400a2And S1400b1、S1400b2And if the actual rotating speed is matched with the first set rotating speed and the actual wind pressure is matched with the first preset wind pressure, executing S1500. If the actual rotating speed is not matched with the first set rotating speed or the actual wind pressure is not matched with the first preset wind pressure, the main controller 10 indicates the alarm mechanism 90 to send out a prompt, and the main controller 10 indicates the gas heating water heater closing mechanism to work.
S1500: the main controller 10 acquires the load of the gas heating water heater.
S1600: the main controller 10 instructs the proportional valve control module 20 to control the gas proportional valve 30 to operate at a preset current according to the load of the gas heating water heater.
S1700: the main controller 10 compares the preset current with the maximum limit current and the minimum limit current, and if the preset current is smaller than the maximum limit current of the gas proportional valve 30 and the preset current is greater than the minimum limit current of the gas proportional valve 30, then S1800a is executed1And S1800a2. If the preset current is greater than the maximum limit current of the gas proportional valve 30 or the preset current is less than the minimum limit current of the gas proportional valve 30, S1800b is executed1And S1800b2。
S1800a1: the main controller 10 instructs the gas secondary pressure feedback module 40 to detect the actual secondary pressure of the gas heating water heater.
S1800a2: the main controller 10 compares the actual secondary pressure with a preset secondary pressure corresponding to the load of the gas heating water heater, and if the actual secondary pressure matches the preset secondary pressure, executes the scheme B. If actual secondary pressureIf the voltage does not match the preset secondary voltage, S1000 is executed again.
S1500、S1600、S1700、S1800a1、S1800a2The beneficial effects are as follows: after the main controller 10 instructs the fan control module 50 to control the speed regulation fan 60 to work at the first set rotation speed, the main controller 10 obtains the load of the gas heating water heater again and controls the gas proportional valve 30 to work at the corresponding preset current, at this time, if the preset current is smaller than the maximum limiting current of the gas proportional valve 30 and the preset current is greater than the minimum limiting current of the gas proportional valve 30, the main controller 10 instructs the gas secondary pressure feedback module 40 to detect the actual secondary pressure of the gas heating water heater again, and if the actual secondary pressure is matched with the preset secondary pressure corresponding to the load of the gas heating water heater, the mode of distributing air according to the load of the gas heating water heater is adopted instead of the mode of distributing air according to the actual secondary pressure, so that the gas heating water heater operates more stably.
S1800b1: the main controller 10 instructs the gas secondary pressure feedback module 40 to detect the actual secondary pressure of the gas heating water heater.
S1800b2: the main controller 10 compares the actual secondary pressure with the maximum limited secondary pressure and the minimum limited secondary pressure, and if the actual secondary pressure is greater than the maximum limited secondary pressure of the gas heating water heater or the actual secondary pressure is less than the minimum limited secondary pressure of the gas heating water heater, S1900 is performed. And if the actual secondary pressure is less than the maximum limited secondary pressure of the gas heating water heater and is greater than the minimum limited secondary pressure of the gas heating water heater, re-executing S1000.
S1900: the main controller 10 compares the load of the gas-fired heating water heater with the maximum limit load and the minimum limit load, and if the load of the gas-fired heating water heater is greater than the maximum limit load of the gas-fired heating water heater or the load of the gas-fired heating water heater is less than the minimum limit load of the gas-fired heating water heater, the main controller 10 instructs the alarm mechanism 90 to give a prompt. Meanwhile, if the load of the gas heating water heater is greater than the maximum limit load of the gas heating water heater, or the load of the gas heating water heater is less than the minimum limit load of the gas heating water heater, the main controller 10 may also instruct the gas heating water heater closing mechanism to operate. And if the load of the gas heating water heater is smaller than the maximum limit load of the gas heating water heater and the load of the gas heating water heater is larger than the minimum limit load of the gas heating water heater, re-executing S1000.
S1500、S1600、S1700、S1800b1、S1800b2S1900, the beneficial effects are as follows: after the main controller 10 instructs the fan control module 50 to control the speed-adjusting fan 60 to operate at the first set rotation speed, the main controller 10 obtains the load of the gas heating water heater again and controls the gas proportional valve 30 to operate at the corresponding preset current, at this time, if the preset current is greater than the maximum limit current of the gas proportional valve 30 or the preset current is less than the minimum limit current of the gas proportional valve 30, the main controller 10 instructs the gas secondary pressure feedback module 40 to detect the actual secondary pressure of the gas heating water heater again, at this time, if the actual secondary pressure is greater than the maximum limit secondary pressure of the gas heating water heater or the actual secondary pressure is less than the minimum limit secondary pressure of the gas heating water heater, the alarm mechanism 90 gives a prompt. Therefore, the purpose of reminding the user can be achieved, the gas heating water heater is prevented from working under overload or low load, and the working safety of the gas heating water heater is guaranteed. Meanwhile, the main controller 10 instructs the gas heating water heater closing mechanism to operate, so that the gas heating water heater can be prevented from operating under abnormal conditions, and the working safety of the gas heating water heater can be guaranteed.
The scheme B comprises the following steps:
s2100: the main controller 10 instructs the fan control module 50 to control the speed-adjusting fan 60 to operate at a second preset rotation speed according to the load of the gas heating water heater.
S2200: the main controller 10 instructs the wind pressure feedback module 70 to detect the actual wind pressure generated by the governor fan 60.
S2300: the main controller 10 compares the actual wind pressure with a second preset wind pressure corresponding to a second preset rotational speed, and if the actual wind pressure is not matched with the second preset wind pressure, the main controller 10 instructs the fan control module 50 to control the speed-adjusting fan 60 to work at a second set rotational speed so that the actual wind pressure is matched with the second preset wind pressure. And if the actual wind pressure is matched with the second preset wind pressure, re-executing S100.
The beneficial effects of S2200 and S2300 are as follows: the size of wind pressure is decided by the speed of rotational speed, if the influence that actual wind pressure received external environment is too big, then wind pressure feedback module 70 detects that the actual wind pressure that speed governing fan 60 produced can not match with the second preset wind pressure, and main control unit 10 instructs fan control module 50 control speed governing fan 60 to set for the rotational speed work with the second this moment for actual wind pressure and the second preset wind pressure match, thereby maintain the air-fuel ratio in suitable scope. So can improve the adaptability of gas heating water heater to the environment, and then guarantee that gas heating water heater has higher thermal efficiency.
S2400a1: the main controller 10 instructs the speed feedback module 80 to detect the actual speed of the governor fan 60.
S2400a2: the main controller 10 compares the actual rotation speed with the second set rotation speed, and if the actual rotation speed is not matched with the second set rotation speed, the main controller 10 instructs the alarm mechanism 90 to give a prompt. Meanwhile, if the actual rotation speed is not matched with the second set rotation speed, the main controller 10 may also instruct the gas heating water heater closing mechanism to operate. If the actual rotation speed is matched with the second set rotation speed, S100 is executed again.
S2400a1、S2400a2The beneficial effects are as follows: under the abnormal conditions such as the speed regulation fan 60 damages or ages, the main controller 10 instructs the fan control module 50 to control the speed regulation fan 60 to work at the second set rotating speed, the speed regulation fan 60 may not reach the corresponding second set rotating speed, the actual rotating speed of the speed regulation fan 60 is detected by the rotating speed feedback module 80, the actual rotating speed and the second set rotating speed are compared by the main controller 10, if the actual rotating speed is not matched with the second set rotating speed, the alarm mechanism 90 gives out a prompt, so that the purpose of reminding a user can be achieved, the phenomenon that the flue is blocked due to the fact that the gas heating water heater is continuously used is avoided, and the service life of the gas heating water heater is prolonged.
S2400b1: the main controller 10 instructs the wind pressure feedback module 70 to detect the actual wind pressure generated by the governor fan 60.
S2400b2: the main controller 10 compares the actual wind pressure with the second preset wind pressure, and if the actual wind pressure is not matched with the second preset wind pressure, the main controller 10 instructs the alarm mechanism 90 to send a prompt. Meanwhile, if the actual wind pressure is not matched with the second preset wind pressure, the main controller 10 may also instruct the gas heating water heater closing mechanism to operate. And if the actual wind pressure is matched with the second preset wind pressure, re-executing S100.
S2400b1、S2400b2The beneficial effects are as follows: under the special circumstances such as speed governing fan 60 with limit speed work, the second wind pressure of predetermineeing still can't be produced to actual wind pressure, and utilize wind pressure feedback module 70 to detect the actual wind pressure that speed governing fan 60 produced and compare actual wind pressure and the second through main control unit 10 and predetermine the wind pressure, if actual wind pressure and the second predetermine the wind pressure and mismatch, alarm mechanism 90 sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In the present embodiment, for S2400a1、S2400a2And S2400b1、S2400b2And if the actual rotating speed is matched with the second set rotating speed and the actual wind pressure is matched with the second preset wind pressure, re-executing S100. If the actual rotating speed is not matched with the second set rotating speed or the actual wind pressure is not matched with the second preset wind pressure, the main controller 10 indicates the alarm mechanism 90 to send out a prompt, and the main controller 10 indicates the gas heating water heater closing mechanism to work.
It should be noted that parameters such as a test rotation speed, a test wind pressure, a preset current, a preset secondary pressure, a first preset rotation speed, a first preset wind pressure, a maximum limit current, a minimum limit current, a maximum limit secondary pressure, a minimum limit secondary pressure, a maximum limit load, a minimum limit load, a second preset rotation speed, a second preset wind pressure, and the like may be preset and stored in the main controller 10. For different actual secondary pressures, a first preset rotating speed and a first preset air pressure which are in one-to-one correspondence with the actual secondary pressures are set, and the first set rotating speed is obtained by calculation according to a comparison result of the actual air pressure and the first preset air pressure, so that the actual air pressure is compensated. For different loads of the gas heating water heater, preset current, preset secondary pressure, a first preset rotating speed and first preset wind pressure which correspond to the loads are set, and the second set rotating speed is calculated according to a comparison result of actual wind pressure and second preset wind pressure, so that compensation of the actual wind pressure is achieved.
As for the judgment of whether the actual secondary pressure is matched with the preset secondary pressure, the judgment can be realized by judging whether the actual secondary pressure deviates from the preset secondary pressure within a certain range, or by judging whether the actual secondary pressure is equal to the preset secondary pressure, the judgment mode can be selected according to the actual requirement, and the judgment mode is not limited here. Similarly, judge whether actual wind pressure matches with first preset wind pressure, judge whether actual rotational speed matches with first settlement rotational speed, judge whether actual wind pressure matches with first preset wind pressure, judge whether actual wind pressure matches with second preset wind pressure, judge whether actual rotational speed matches with second settlement rotational speed, judge whether actual wind pressure matches with test wind pressure, can adopt above judgement mode again, here is no longer repeated.
It should be noted that, S1400a1、S1400a2And S1400b1、S1400b2There is no sequence between them, i.e. S1400a can be executed first1、S1400a2Then, S1400b is executed1、S1400b2Alternatively, S1400b may be executed first1、S1400b2Then, S1400a is executed1、S1400a2S1400a may also be performed simultaneously1、S1400a2And S1400b1、S1400b2。
Also, S2400a1、S2400a2And S2400b1、S2400b2There is no sequence between them, i.e. S2400a can be executed first1、S2400a2Then, S2400b is executed1、S2400b2Alternatively, S2400b may be executed first1、S2400b2Then, S2400a is executed1、S2400a2S2400a may also be performed simultaneously1、S2400a2And S2400a1、S2400a2。
Compared with the background art, the air-fuel ratio control method of the gas heating water heater has the following beneficial effects: in actual use, the main controller 10 instructs the proportional valve control module 20 to control the gas proportional valve 30 to operate at a preset current according to the load of the gas heating water heater. The load correspondence of different gas heating water heaters has different preset secondary pressures, if the actual secondary pressure that gas heating water heater was detected to gas secondary pressure feedback module 40 does not match with preset secondary pressure, main control unit 10 instructs fan control module 50 control speed governing fan 60 to work with the first predetermined rotational speed that corresponds with actual secondary pressure this moment, accomplishes the air distribution according to actual secondary pressure to maintain the air-fuel ratio in suitable scope. If the gas secondary pressure feedback module 40 detects that the actual secondary pressure of the gas heating water heater is matched with the preset secondary pressure, the main controller 10 instructs the fan control module 50 to control the speed-adjusting fan 60 to work at a second preset rotating speed corresponding to the load of the gas heating water heater, and the air distribution is completed according to the load of the gas heating water heater, so that the air-fuel ratio is maintained in a proper range. So can maintain gas heating water heater and move under the operating mode of preferred, and then guarantee that gas heating water heater has higher thermal efficiency.
Referring to fig. 2, the air-fuel ratio control device for a gas heating water heater according to the present embodiment includes a main controller 10, a blower control module 50, a proportional valve control module 20, and a gas secondary pressure feedback module 40, wherein the blower control module 50, the proportional valve control module 20, and a wind pressure feedback module 70 are respectively electrically connected to the main controller 10;
the main controller 10 is configured to obtain a load of the gas heating water heater, and the main controller 10 is further configured to instruct the proportional valve control module 20 to control the gas proportional valve 30 to operate at a preset current according to the load of the gas heating water heater;
the main controller 10 is further configured to instruct the gas secondary pressure feedback module 40 to detect an actual secondary pressure of the gas heating water heater;
the main controller 10 is further configured to compare the actual secondary pressure with a preset secondary pressure corresponding to a load of the gas heating water heater, and if the actual secondary pressure is not matched with the preset secondary pressure, the main controller 10 instructs the fan control module 50 to control the speed-adjusting fan 60 to operate at a first preset rotation speed according to the actual secondary pressure; if the actual secondary pressure is matched with the preset secondary pressure, the main controller 10 instructs the fan control module 50 to control the speed-adjusting fan 60 to work at a second preset rotating speed according to the load of the gas heating water heater.
Compared with the background art, the air-fuel ratio control device of the gas heating water heater has the following beneficial effects: in actual use, the main controller 10 instructs the proportional valve control module 20 to control the gas proportional valve 30 to operate at a preset current according to the load of the gas heating water heater. The load correspondence of different gas heating water heaters has different preset secondary pressures, if the actual secondary pressure that gas heating water heater was detected to gas secondary pressure feedback module 40 does not match with preset secondary pressure, main control unit 10 instructs fan control module 50 control speed governing fan 60 to work with the first predetermined rotational speed that corresponds with actual secondary pressure this moment, accomplishes the air distribution according to actual secondary pressure to maintain the air-fuel ratio in suitable scope. If the gas secondary pressure feedback module 40 detects that the actual secondary pressure of the gas heating water heater is matched with the preset secondary pressure, the main controller 10 instructs the fan control module 50 to control the speed-adjusting fan 60 to work at a second preset rotating speed corresponding to the load of the gas heating water heater, and the air distribution is completed according to the load of the gas heating water heater, so that the air-fuel ratio is maintained in a proper range. So can maintain gas heating water heater and move under the operating mode of preferred, and then guarantee that gas heating water heater has higher thermal efficiency.
In this embodiment, the air-fuel ratio control device of the gas heating water heater further includes a wind pressure feedback module 70, and the wind pressure feedback module 70 is electrically connected to the main controller 10;
the main controller 10 is further configured to instruct the wind pressure feedback module 70 to detect an actual wind pressure generated by the speed-adjusting fan 60;
main control unit 10 still is used for comparing actual wind pressure and the first predetermined wind pressure that corresponds with first predetermined rotational speed, if actual wind pressure and first predetermined wind pressure mismatch, then main control unit 10 instructs fan control module 50 control speed governing fan 60 to work with first predetermined rotational speed so that actual wind pressure matches with first predetermined wind pressure.
The size of wind pressure is decided by the speed of rotational speed, if the influence that actual wind pressure received external environment is too big, then wind pressure feedback module 70 detects the actual wind pressure that speed governing fan 60 produced and can not match with first predetermined wind pressure, and main control unit 10 instructs fan control module 50 control speed governing fan 60 to work with first settlement rotational speed this moment for actual wind pressure matches with first predetermined wind pressure, thereby maintains the air-fuel ratio in suitable scope. So can improve the adaptability of gas heating water heater to the environment, and then guarantee that gas heating water heater has higher thermal efficiency.
In this embodiment, the main controller 10 is further configured to compare a preset current with a maximum limit current and a minimum limit current, if the preset current is smaller than the maximum limit current of the gas proportional valve 30 and the preset current is greater than the minimum limit current of the gas proportional valve 30, the main controller 10 instructs the gas secondary pressure feedback module 40 to detect an actual secondary pressure of the gas heating water heater, the main controller 10 compares the actual secondary pressure with a preset secondary pressure corresponding to a load of the gas heating water heater, and if the actual secondary pressure is matched with the preset secondary pressure, the main controller 10 instructs the fan control module 50 to control the speed regulation fan 60 to operate at a second preset rotation speed according to the load of the gas heating water heater.
After the main controller 10 instructs the fan control module 50 to control the speed regulation fan 60 to work at the first set rotation speed, the main controller 10 obtains the load of the gas heating water heater again and controls the gas proportional valve 30 to work at the corresponding preset current, at this time, if the preset current is smaller than the maximum limiting current of the gas proportional valve 30 and the preset current is greater than the minimum limiting current of the gas proportional valve 30, the main controller 10 instructs the gas secondary pressure feedback module 40 to detect the actual secondary pressure of the gas heating water heater again, and if the actual secondary pressure is matched with the preset secondary pressure corresponding to the load of the gas heating water heater, the mode of distributing air according to the load of the gas heating water heater is adopted instead of the mode of distributing air according to the actual secondary pressure, so that the gas heating water heater operates more stably.
In this embodiment, the air-fuel ratio control device of the gas heating water heater further includes an alarm mechanism 90, and the alarm mechanism 90 is electrically connected to the main controller 10;
the main controller 10 is further configured to compare a preset current with a maximum limit current and a minimum limit current, if the preset current is greater than the maximum limit current of the gas proportional valve 30 or the preset current is less than the minimum limit current of the gas proportional valve 30, the main controller 10 instructs the gas secondary pressure feedback module 40 to detect an actual secondary pressure of the gas heating water heater, the main controller 10 compares the actual secondary pressure with the maximum limit secondary pressure and the minimum limit secondary pressure, if the actual secondary pressure is greater than the maximum limit secondary pressure of the gas heating water heater or the actual secondary pressure is less than the minimum limit secondary pressure of the gas heating water heater, the main controller 10 compares a load of the gas heating water heater with the maximum limit load and the minimum limit load, and if the load of the gas heating water heater is greater than the maximum limit load of the gas heating water heater, or the load of the gas heating water heater is less than the minimum limit load of the gas heating water heater, the main controller 10 instructs the alarm mechanism 90 to give a prompt.
After the main controller 10 instructs the fan control module 50 to control the speed-adjusting fan 60 to operate at the first set rotation speed, the main controller 10 obtains the load of the gas heating water heater again and controls the gas proportional valve 30 to operate at the corresponding preset current, at this time, if the preset current is greater than the maximum limit current of the gas proportional valve 30 or the preset current is less than the minimum limit current of the gas proportional valve 30, the main controller 10 instructs the gas secondary pressure feedback module 40 to detect the actual secondary pressure of the gas heating water heater again, at this time, if the actual secondary pressure is greater than the maximum limit secondary pressure of the gas heating water heater or the actual secondary pressure is less than the minimum limit secondary pressure of the gas heating water heater, the alarm mechanism 90 gives a prompt. Therefore, the overload or low-load operation of the gas heating water heater can be prevented, and the working safety of the gas heating water heater can be ensured.
In this embodiment, the air-fuel ratio control device of the gas heating water heater further includes a rotation speed feedback module 80, and the rotation speed feedback module 80 is electrically connected to the main controller 10;
the main controller 10 is further configured to instruct the rotation speed feedback module 80 to detect an actual rotation speed of the speed-regulating fan 60;
the main controller 10 is further configured to compare the actual rotating speed with the first set rotating speed, and if the actual rotating speed is not matched with the first set rotating speed, the main controller 10 instructs the alarm mechanism 90 to send a prompt.
Under the abnormal conditions such as the speed regulation fan 60 damages or ages, main controller 10 instructs fan control module 50 to control speed regulation fan 60 and perhaps can't reach corresponding first settlement rotational speed when working with first settlement rotational speed, and utilize rotational speed feedback module 80 to detect the actual rotational speed of speed regulation fan 60 and compare actual rotational speed and first settlement rotational speed through main controller 10, if actual rotational speed and first settlement rotational speed do not match, alarm mechanism 90 sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater and lead to the flue to block up, improve the life of gas heating water heater.
In this embodiment, the main controller 10 is further configured to compare the actual wind pressure with a first preset wind pressure, and if the actual wind pressure is not matched with the first preset wind pressure, the main controller 10 instructs the alarm mechanism 90 to issue a prompt.
Under such as speed governing fan 60 with special circumstances such as limit speed work, the first wind pressure of predetermineeing still can't be produced to actual wind pressure, and utilize wind pressure feedback module 70 to detect the actual wind pressure that speed governing fan 60 produced and compare actual wind pressure and first wind pressure of predetermineeing through main control unit 10, if actual wind pressure and first wind pressure of predetermineeing do not match, alarm mechanism 90 sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In this embodiment, the main controller 10 is further configured to compare the actual wind pressure with a second preset wind pressure corresponding to the second preset rotational speed, and if the actual wind pressure is not matched with the second preset wind pressure, the main controller 10 instructs the fan control module 50 to control the speed-adjusting fan 60 to operate at the second preset rotational speed so as to match the actual wind pressure with the second preset wind pressure.
The size of wind pressure is decided by the speed of rotational speed, if the influence that actual wind pressure received external environment is too big, then wind pressure feedback module 70 detects that the actual wind pressure that speed governing fan 60 produced can not match with the second preset wind pressure, and main control unit 10 instructs fan control module 50 control speed governing fan 60 to set for the rotational speed work with the second this moment for actual wind pressure and the second preset wind pressure match, thereby maintain the air-fuel ratio in suitable scope. So can improve the adaptability of gas heating water heater to the environment, and then guarantee that gas heating water heater has higher thermal efficiency.
In this embodiment, the main controller 10 is further configured to compare the actual rotating speed with a second set rotating speed, and if the actual rotating speed is not matched with the second set rotating speed, the main controller 10 instructs the alarm mechanism 90 to issue a prompt.
Under the abnormal conditions such as the speed regulation fan 60 damages or ages, the main controller 10 instructs the fan control module 50 to control the speed regulation fan 60 to work at the second set rotating speed, the speed regulation fan 60 may not reach the corresponding second set rotating speed, the actual rotating speed of the speed regulation fan 60 is detected by the rotating speed feedback module 80, the actual rotating speed and the second set rotating speed are compared by the main controller 10, if the actual rotating speed is not matched with the second set rotating speed, the alarm mechanism 90 gives out a prompt, so that the purpose of reminding a user can be achieved, the phenomenon that the flue is blocked due to the fact that the gas heating water heater is continuously used is avoided, and the service life of the gas heating water heater is prolonged.
In this embodiment, the main controller 10 is further configured to compare the actual wind pressure with the second preset wind pressure, and if the actual wind pressure is not matched with the second preset wind pressure, the main controller 10 instructs the alarm mechanism 90 to issue a prompt.
Under the special circumstances such as speed governing fan 60 with limit speed work, the second wind pressure of predetermineeing still can't be produced to actual wind pressure, and utilize wind pressure feedback module 70 to detect the actual wind pressure that speed governing fan 60 produced and compare actual wind pressure and the second through main control unit 10 and predetermine the wind pressure, if actual wind pressure and the second predetermine the wind pressure and mismatch, alarm mechanism 90 sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
In this embodiment, the main controller 10 is further configured to instruct the fan control module 50 to control the speed-adjustable fan 60 to operate at the test rotation speed;
the main controller 10 is further used for comparing the actual wind pressure with the test wind pressure, and if the actual wind pressure is not matched with the test wind pressure, the main controller 10 instructs the alarm mechanism 90 to give a prompt.
Under the abnormal conditions such as speed governing fan 60 damages or ageing, main control unit 10 instructs speed governing fan 60 control speed governing fan control module 50 probably can't produce the test wind pressure with test rotational speed during operation speed governing fan 60, and utilize wind pressure feedback module 70 to detect the actual wind pressure that speed governing fan 60 produced and compare actual wind pressure and test wind pressure through main control unit 10, if actual wind pressure and test wind pressure do not match, alarm mechanism 90 sends the suggestion, can play the purpose of reminding the user like this, avoid continuing to use gas heating water heater to lead to the flue to block up, improve the life of gas heating water heater.
Specifically, the proportional valve control module 20 implements control of the gas proportional valve 30 in the form of a proportional valve control circuit, the gas secondary pressure block feedback module implements control of actual secondary pressure in the form of a gas secondary pressure block feedback circuit, the fan control module 50 implements control of the speed regulation fan 60 in the form of a fan control circuit, the wind pressure feedback module 70 implements detection of actual wind pressure generated by the speed regulation fan 60 in the form of a wind pressure feedback circuit, and the rotating speed feedback module 80 implements detection of actual rotating speed of the speed regulation fan 60 in the form of a rotating speed feedback circuit.
In this embodiment, for different loads of the gas-fired heating water heater, the main controller 10 outputs modulation and demodulation signals with different duty ratios to the fan control circuit to control the speed-adjusting fan 60 to operate at different first preset rotation speeds or second preset rotation speeds. The wind pressure feedback module 70 includes a wind pressure sensor electrically connected to the main controller 10 to detect an actual wind pressure generated by the speed-adjusting fan 60. The alarm mechanism 90 comprises a sound module and a display module, wherein the sound module and the display module are respectively electrically connected with the main controller 10, the sound module is used for giving out alarm bell, and the display module is used for displaying fault codes, so that the prompt effect is good.
In this embodiment, the air-fuel ratio control device of the gas heating water heater further includes a closing mechanism of the gas heating water heater, and the closing mechanism of the gas heating water heater is electrically connected to the main controller 1010.
The gas heating water heater described in this embodiment includes a speed-adjusting fan 60, a gas proportional valve 30 and the air-fuel ratio control device of the gas heating water heater, the speed-adjusting fan 60 is electrically connected to the fan control module 50, and the gas proportional valve 30 is electrically connected to the proportional valve control module 20.
The gas heating water heater of this embodiment, compare produced beneficial effect with the background art: in actual use, the main controller 10 instructs the proportional valve control module 20 to control the gas proportional valve 30 to operate at a preset current according to the load of the gas heating water heater. The load correspondence of different gas heating water heaters has different preset secondary pressures, if the actual secondary pressure that gas heating water heater was detected to gas secondary pressure feedback module 40 does not match with preset secondary pressure, main control unit 10 instructs fan control module 50 control speed governing fan 60 to work with the first predetermined rotational speed that corresponds with actual secondary pressure this moment, accomplishes the air distribution according to actual secondary pressure to maintain the air-fuel ratio in suitable scope. If the gas secondary pressure feedback module 40 detects that the actual secondary pressure of the gas heating water heater is matched with the preset secondary pressure, the main controller 10 instructs the fan control module 50 to control the speed-adjusting fan 60 to work at a second preset rotating speed corresponding to the load of the gas heating water heater, and the air distribution is completed according to the load of the gas heating water heater, so that the air-fuel ratio is maintained in a proper range. So can maintain the operation under the operating mode of preferred, and then guarantee to have higher thermal efficiency.
In this embodiment, the gas heating water heater further includes a switching power supply, and the speed regulation fan 60 is connected to an external power supply through the switching power supply, so that the use is convenient.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (8)

1. A method for controlling the air-fuel ratio of a gas heating water heater is characterized by comprising the following steps:
s100: the main controller (10) acquires the load of the gas heating water heater;
s200: the main controller (10) indicates the proportional valve control module (20) to control the gas proportional valve (30) to work at a preset current according to the load of the gas heating water heater;
s300: the main controller (10) indicates the gas secondary pressure feedback module (40) to detect the actual secondary pressure of the gas heating water heater;
s400: the main controller (10) compares the actual secondary pressure with a preset secondary pressure corresponding to the load of the gas heating water heater, and if the actual secondary pressure is not matched with the preset secondary pressure, the scheme A is executed; if the actual secondary pressure is matched with the preset secondary pressure, executing the scheme B;
the scheme A comprises the following steps:
s1100: the main controller (10) indicates the fan control module (50) to control the speed-regulating fan (60) to work at a first preset rotating speed according to the actual secondary pressure;
s1200: the main controller (10) indicates a wind pressure feedback module (70) to detect the actual wind pressure generated by the speed-regulating fan (60);
s1300: the method comprises the following steps that the main controller (10) compares actual wind pressure with a first preset wind pressure corresponding to a first preset rotating speed, and if the actual wind pressure is not matched with the first preset wind pressure, the main controller (10) instructs a fan control module (50) to control a speed regulation fan (60) to work at the first set rotating speed so that the actual wind pressure is matched with the first preset wind pressure;
the scheme B comprises the following steps:
s2100: the main controller (10) instructs the fan control module (50) to control the speed regulation fan (60) to work at a second preset rotating speed according to the load of the gas heating water heater;
s2200: the main controller (10) indicates a wind pressure feedback module (70) to detect the actual wind pressure generated by the speed-regulating fan (60);
s2300: the main controller (10) compares the actual wind pressure with a second preset wind pressure corresponding to the second preset rotating speed, and if the actual wind pressure is not matched with the second preset wind pressure, the main controller (10) instructs the fan control module (50) to control the speed regulation fan (60) to work at a second preset rotating speed so that the actual wind pressure is matched with the second preset wind pressure.
2. The air-fuel ratio control method for the gas-fired heating water heater according to claim 1, wherein the scheme A further comprises the following steps after S1300:
s1500: the main controller (10) acquires the load of the gas heating water heater;
s1600: the main controller (10) indicates the proportional valve control module (20) to control the gas proportional valve (30) to work at a preset current according to the load of the gas heating water heater;
s1700: the main controller (10) compares the preset current with the maximum limit current and the minimum limit current, if the preset current is smaller than the maximum limit current of the gas proportional valve (30) and the preset current is larger than the minimum limit current of the gas proportional valve (30), S1800a is executed1And S1800a2；
S1800a1: the main controller (10) indicates the gas secondary pressure feedback module (40) to detect the actual secondary pressure of the gas heating water heater;
S1800a2: and the main controller (10) compares the actual secondary pressure with a preset secondary pressure corresponding to the load of the gas heating water heater, and if the actual secondary pressure is matched with the preset secondary pressure, the scheme B is executed.
3. The air-fuel ratio control method for the gas-fired heating water heater according to claim 1, wherein the scheme A further comprises the following steps after S1300:
s1500: the main controller (10) acquires the load of the gas heating water heater;
s1600: the main controller (10) indicates the proportional valve control module (20) to control the gas proportional valve (30) to work at a preset current according to the load of the gas heating water heater;
s1700: the main controller (10) compares the preset current with the maximum limit current and the minimum limit current, if the preset current is larger than the maximum limit current of the gas proportional valve (30) or the preset current is smaller than the minimum limit current of the gas proportional valve (30), S1800b is executed1And S1800b2；
S1800b1: the main controller (10) indicates the gas secondary pressure feedback module (40) to detect the actual secondary pressure of the gas heating water heater;
S1800b2: the main controller (10) compares the actual secondary pressure with the maximum limit secondary pressure and the minimum limit secondary pressure, and if the actual secondary pressure is greater than the maximum limit secondary pressure of the gas heating water heater or the actual secondary pressure is less than the minimum limit secondary pressure of the gas heating water heater, S1900 is executed;
s1900: the main controller (10) compares the load of the gas heating water heater with the maximum limit load and the minimum limit load, and if the load of the gas heating water heater is larger than the maximum limit load of the gas heating water heater or the load of the gas heating water heater is smaller than the minimum limit load of the gas heating water heater, the main controller (10) indicates the alarm mechanism (90) to give out a prompt.
4. The air-fuel ratio control method for the gas-fired heating water heater according to claim 2, wherein the scheme A further comprises the following steps after S1300 and before S1500:
S1400a1: the main controller (10) indicates a rotating speed feedback module (80) to detect the actual rotating speed of the speed-regulating fan (60);
S1400a2: the main controller (10) compares the actual rotating speed with the first set rotating speed, and if the actual rotating speed is not matched with the first set rotating speed, the main controller (10) indicates the alarm mechanism (90) to give a prompt.
5. The air-fuel ratio control method for the gas-fired heating water heater according to claim 2, wherein the scheme A further comprises the following steps after S1300 and before S1600:
S1400b1: the main controller (10) indicates a wind pressure feedback module (70) to detect the actual wind pressure generated by the speed-regulating fan (60);
S1400b2: the main controller (10) compares the actual wind pressure with the first preset wind pressure, and if the actual wind pressure is not matched with the first preset wind pressure, the main controller (10) indicates the alarm mechanism (90) to send a prompt.
6. The air-fuel ratio control method of a gas-fired heating water heater according to claim 1, further comprising, before S100, the steps of:
s10: the main controller (10) indicates the fan control module (50) to control the speed-regulating fan (60) to work at a test rotating speed;
s20: the main controller (10) indicates a wind pressure feedback module (70) to detect the actual wind pressure generated by the speed-regulating fan (60);
s30: the main controller (10) compares the actual wind pressure with the test wind pressure, and if the actual wind pressure is not matched with the test wind pressure, the main controller (10) indicates the alarm mechanism (90) to send out a prompt.
7. The air-fuel ratio control device of the gas heating water heater is characterized by comprising a main controller (10), a fan control module (50), a proportional valve control module (20) and a gas secondary pressure feedback module (40), wherein the fan control module (50), the proportional valve control module (20) and the wind pressure feedback module (70) are respectively and electrically connected with the main controller (10);
the main controller (10) is used for acquiring the load of the gas heating water heater, and the main controller (10) is also used for indicating the proportional valve control module (20) to control the gas proportional valve (30) to work at a preset current according to the load of the gas heating water heater;
the main controller (10) is also used for indicating a gas secondary pressure feedback module (40) to detect the actual secondary pressure of the gas heating water heater;
the main controller (10) is also used for comparing the actual secondary pressure with a preset secondary pressure corresponding to the load of the gas heating water heater, and if the actual secondary pressure is not matched with the preset secondary pressure, the main controller (10) indicates the fan control module (50) to control the speed regulating fan (60) to work at a first preset rotating speed according to the actual secondary pressure; and if the actual secondary pressure is matched with the preset secondary pressure, the main controller (10) instructs the fan control module (50) to control the speed regulation fan (60) to work at a second preset rotating speed according to the load of the gas heating water heater.
8. The gas heating water heater is characterized by comprising a speed regulation fan (60), a gas proportional valve (30) and the gas heating water heater air-fuel ratio control device according to claim 7, wherein the speed regulation fan (60) is electrically connected with the fan control module (50), and the gas proportional valve (30) is electrically connected with the proportional valve control module (20).
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