Control method of gas water heater, gas water heater and readable storage medium

Abstract

The application provides a control method of a gas water heater, the gas water heater and a readable storage medium. The method comprises the following steps: obtaining the carbon monoxide concentration generated by a burner; and adjusting the fan output value of a fan according to the carbon monoxide concentration. Thus, the combustion condition of the gas water heater is determined according to the carbon monoxide concentration, and the output value of the fan operation is adjusted. The water heater can be maintained in a good combustion condition during the combustion operation, the phenomenon of insufficient combustion of the gas water heater is avoided, the heat production efficiency is improved, the working stability of the gas water heater is ensured, the use safety of the user is improved, the control precision of the gas water heater is improved, the waste gas amount is effectively reduced, and the gas water heater is more environmentally friendly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas water heaters, in particular to a control method of a gas water heater, a gas water heater and a readable storage medium. BACKGROUND

[0002] At present, the gas water heater has become the main water heater in the market, however, due to the difference of installation environment, the supply pressure and the heat value of the gas are quite different, so that the gas water heater cannot maintain in good conditions to perform combustion operation. For example, poor ventilation environment, abnormal gas heat value, exhaust pipe backflow, etc., which are easy to cause incomplete combustion, vibration combustion and other problems. SUMMARY

[0003] The present application aims at least to solve one of the problems existing in the prior art or related art.

[0004] To this end, the first aspect of the present application provides a control method of a gas water heater.

[0005] The second aspect of the present application further provides a gas water heater.

[0006] The third aspect of the present application further provides a readable storage medium.

[0007] Therefore, the first aspect of the present application provides a control method of a gas water heater, the gas water heater comprising a fan and a burner, the control method of the gas water heater comprising: obtaining a carbon monoxide concentration generated by the burner; and adjusting a fan output value of the fan according to the carbon monoxide concentration.

[0008] The present application provides a control method, after receiving a start instruction of the gas water heater, the burner starts to burn the gas to heat the cold water, and the fan starts to run at an initial fan output value, the output end of the fan is arranged close to the burner of the gas water heater to deliver air to the burner, thereby providing sufficient oxygen for the burner. As the gas is continuously burned, a certain amount of waste gas will be generated due to incomplete combustion of part of the gas, the carbon monoxide concentration in the waste gas is obtained by a carbon monoxide detection device, and whether the current combustion condition of the gas water heater is abnormal, i.e. whether the gas and air are in a better ratio, is judged by the carbon monoxide concentration, and the output value of the fan running is adjusted to increase or decrease the oxygen supply to the burner. On the one hand, it can ensure that the water heater maintains good combustion conditions during combustion operation, avoids the phenomenon of incomplete combustion of the gas water heater, improves the heat production efficiency, on the other hand, it can ensure the working stability of the gas water heater, improve the use safety of the user, and on the other hand, it improves the control precision of the gas water heater, can effectively reduce the amount of waste gas, and is more environmentally friendly.

[0009] The fan output value is a fan control parameter, and is used to adjust the ventilation of the fan.

[0010] Specifically, the control method is used for controlling a gas water heater, and the gas water heater comprises a shell, a smoke exhaust device, a heat exchanger, a combustion chamber, a burner arranged in the combustion chamber, a carbon monoxide (CO) detection device, a gas pipeline connected with the burner, a gas valve and a fan arranged on the gas pipeline. The heat exchanger comprises a water inlet and a water outlet, cold water flows into the heat exchanger from the water inlet, the burner burns gas to output heat to heat the cold water flowing into the heat exchanger to form hot water, and the hot water flows out of the heat exchanger through the water outlet. The fan is arranged below the shell, and the fan blows air into the combustion chamber when working to supply oxygen to the burner during operation, thereby improving the combustion efficiency of the burner. The CO detection device is arranged at a position between the burner and the smoke exhaust device, and can detect the concentration of carbon monoxide in exhaust gas generated after combustion. The gas valve is selected from a gas valve, and the gas valve can adjust the proportion of gas and oxygen input into the burner.

[0011] According to the control method of the gas water heater, the following additional technical features can be further provided.

[0012] In the above technical solution, further, the fan output value of the fan is adjusted according to the carbon monoxide concentration, comprising: based on the carbon monoxide concentration exceeding a first preset concentration range, the fan output value is adjusted according to a preset offset.

[0013] In the technical solution, the first preset concentration range is set in advance according to the carbon monoxide data of the gas water heater during combustion operation in a good combustion state. If the current detected carbon monoxide concentration exceeds the first preset concentration range, it indicates that the gas water heater is in an abnormal combustion state at this time, and the fan output value is increased or decreased according to the preset offset, so as to increase or decrease the oxygen supply amount of the fan to the burner, promote the full mixing of gas and air with a proper proportion, ensure the stability of the gas composition, make the gas water heater in a safe working state, avoid incomplete combustion and vibration combustion, and be more energy-saving and efficient, and take into account the usability and safety of the gas water heater.

[0014] Further, if the current detected carbon monoxide concentration is within the first preset concentration range, that is, the carbon monoxide concentration is less than or equal to the maximum value of the first preset concentration range and greater than or equal to the minimum value of the first preset concentration range, it indicates that the gas water heater is in a good combustion state at this time, and the fan output value does not need to be adjusted.

[0015] In any of the above technical solutions, further, the fan output value of the fan is adjusted according to the preset offset, comprising: based on the carbon monoxide concentration being greater than or equal to a first concentration threshold, the fan output value is controlled to decrease according to a first preset offset.

[0016] In the technical solution, when it is determined that the current detected carbon monoxide concentration exceeds the first preset concentration interval, that is, the gas water heater is in an abnormal combustion state, the carbon monoxide concentration is continuously compared with the first concentration threshold. If the carbon monoxide concentration is greater than or equal to the first concentration threshold, it indicates that the current carbon monoxide concentration is too high, and there may be problems such as abnormal gas calorific value, backflow of exhaust smoke, etc. If the operation continues, it is easy to cause danger. At this time, it is necessary to reduce the fan output value of the gas water heater to reduce the amount of air introduced, and then the fan output value is controlled to be reduced according to the first preset offset, so as to reduce the carbon monoxide concentration generated by the burner. Thus, when the gas water heater is in an abnormal combustion state, it can be self-judged, self-adjusted and self-adapted according to the difference in carbon monoxide concentration, and the combustion state of the gas is more efficient and accurate, so as to ensure that the combustion operation of the gas water heater is maintained in a good state, avoid problems such as vibration combustion caused by insufficient gas combustion, emission of a large amount of pollution gas after combustion, etc., and further improve the safety of the use of the gas water heater.

[0017] Among them, the first concentration threshold is greater than the maximum value of the first preset concentration interval.

[0018] In any of the above technical solutions, further, adjusting the fan output value of the fan according to the preset offset includes: based on the carbon monoxide concentration being less than or equal to the second concentration threshold, controlling the fan output value to increase according to a second preset offset.

[0019] In the technical solution, when it is determined that the current detected carbon monoxide concentration exceeds the first preset concentration interval, that is, the gas water heater is in an abnormal combustion state, the carbon monoxide concentration is continuously compared with the second concentration threshold. If the carbon monoxide concentration is less than or equal to the second concentration threshold, it indicates that the current carbon monoxide concentration is too low, and there may be problems such as blockage of the air inlet pipe of the burner, poor ventilation, etc. At this time, the fan output value is controlled to increase according to the second preset offset to increase the oxygen supply of the fan to the burner, promote sufficient combustion, and thus when the gas water heater is in an abnormal combustion state, it can be self-judged, self-adjusted and self-adapted according to the difference in carbon monoxide concentration, and the combustion state of the gas is more efficient and accurate, so as to ensure that the combustion operation of the gas water heater is maintained in a good state, avoid problems such as vibration combustion caused by insufficient gas combustion, emission of a large amount of pollution gas after combustion, etc., and further improve the safety of the use of the gas water heater.

[0020] Among them, the first concentration threshold is greater than the second concentration threshold. The second concentration threshold is less than the minimum value of the first preset concentration interval.

[0021] In any of the above technical solutions, further, the greater the first concentration threshold, the greater the first preset offset; the smaller the second concentration threshold, the greater the second preset offset.

[0022] In the technical solution, the first concentration threshold includes multiple sets of values, which can be reasonably set according to the equipment parameters, operating parameters and the like of the gas water heater. Different first concentration thresholds can correspond to different first preset offsets. Moreover, the greater the first concentration threshold, the greater the first preset offset, that is, the first concentration threshold and the first preset offset are positively correlated. Similarly, the second concentration threshold also includes multiple sets of values, which can be reasonably set according to the equipment parameters, operating parameters and the like of the gas water heater. Different second concentration thresholds can correspond to the same or different second preset offsets. Moreover, the smaller the second concentration threshold, the greater the second preset offset, that is, the second concentration threshold and the second preset offset are negatively correlated. Thus, the fan output value of the fan can be flexibly adjusted according to the carbon monoxide concentration, the control accuracy of the gas water heater is improved, the problem of system control deviation of the gas water heater is avoided or reduced, and the problems of incomplete combustion, vibration combustion and waste gas emission of the gas water heater are improved.

[0023] In any of the above technical solutions, further, before adjusting the fan output value of the fan according to the preset offset, the method further includes: obtaining a hot water production rate of the gas water heater; and determining a first preset concentration interval according to the hot water production rate.

[0024] In the technical solution, the correspondence between the hot water production rate of the gas water heater and the first preset concentration interval is preconfigured. Before adjusting the fan output value of the fan according to the preset offset, the hot water production rate of the gas water heater is detected or calculated, and the first preset concentration interval corresponding to the currently obtained hot water production rate is queried through the correspondence between the hot water production rate and the first preset concentration interval. In order to judge the current combustion condition of the gas water heater according to the first preset concentration interval and the carbon monoxide concentration, the control accuracy of the gas water heater is improved, the efficiency and stability of the adjustment of the fan output value are improved, and the adjustment demand under different models of the gas water heater and different external environmental conditions of the gas water heater can be met.

[0025] In any of the above technical solutions, further, obtaining the hot water production rate of the gas water heater includes: obtaining a water outlet temperature, a water inlet temperature and a water flow rate of the gas water heater; and determining the hot water production rate according to the water outlet temperature, the water inlet temperature and the water flow rate.

[0026] In the technical solution, the difference between the water outlet temperature and the water inlet temperature of the gas water heater, that is, the temperature rise value of the gas water heater, is calculated. The product of the difference and the water flow rate is the hot water production rate. Thus, the hot water production rate can be calculated according to the current water outlet temperature, water inlet temperature and water flow rate of the gas water heater, so as to flexibly set the first preset concentration interval according to different operating states of the gas water heater, reduce the misjudgment caused by equipment aging and the like, and further improve the control accuracy of the gas water heater and guarantee the efficiency and stability of the adjustment of the fan output value.

[0027] In any of the foregoing technical solutions, further, the control method of the gas water heater further comprises: based on the fan output value exceeding the preset output value range, controlling the gas water heater to be closed and / or outputting an alarm information.

[0028] In this technical solution, considering the processor failure for controlling the fan output value, the serious blockage of the flue pipe, the wrong use of gas, the blockage or damage of the heat exchanger, the damage of the burner, the damage of the fan, etc., the fan output value cannot be adjusted within the preset output value range, thereby causing the abnormal problem of the fan output value adjustment. Therefore, the size of the fan output value is monitored, and when the fan output value exceeds the preset output value range, that is, the fan output value is greater than or equal to the maximum value of the allowable fan output value adjustment, or less than or equal to the minimum value of the allowable fan output value adjustment, it indicates that the fan output value is abnormal, which not only easily damages the gas water heater, but also easily causes safety hazards. At this time, the gas water heater is controlled to be closed and / or an alarm information is outputted, so as to reduce the safety risk and ensure that the user can maintain the gas water heater in time.

[0029] In any of the foregoing technical solutions, further, the control method of the gas water heater further comprises: based on the carbon monoxide concentration being greater than a third concentration threshold or the carbon monoxide concentration being less than a fourth concentration threshold, controlling the gas water heater to be closed and / or outputting an alarm information; wherein the third concentration threshold is greater than the fourth concentration threshold.

[0030] In this technical solution, when the carbon monoxide concentration is greater than the third concentration threshold or the carbon monoxide concentration is less than the fourth concentration threshold, that is, the current detected carbon monoxide concentration exceeds the safe concentration range of carbon monoxide, the gas water heater is controlled to be closed and / or an alarm information is outputted. Further, the effective control of the carbon monoxide content generated by the burner is realized, which not only can effectively prevent the damage of the gas water heater and prolong the service life of the gas water heater, but also can reduce the safety risk and ensure that the user can maintain the gas water heater in time, thereby improving the safety performance of the gas water heater.

[0031] In any of the foregoing technical solutions, further, adjusting the fan output value of the gas water heater comprises: adjusting the duty cycle of the fan; or adjusting the operating frequency of the fan; or adjusting the pulse width of the fan.

[0032] In this technical solution, the fan power is adjusted by adjusting the duty cycle or the operating frequency or the pulse width of the fan, thereby adjusting the fan output value.

[0033] Specifically, when the pulse width is fixed, the higher the operating frequency, the greater the power, and the greater the fan output value. When the operating frequency is fixed, the greater the pulse width, the greater the power, and the greater the fan output value. When the pulse width and operating frequency are fixed, the higher the duty cycle, the greater the power, that is, pulse width modulation (PWM).

[0034] According to the second aspect of the present application, a gas water heater is also provided, comprising: a burner; a fan for conveying air to the burner; a carbon monoxide detection device for obtaining the carbon monoxide concentration generated by the burner; a memory storing programs or instructions; a processor connected to the memory, the burner, the carbon monoxide detection component and the fan, and the processor implements the steps of the control method of the gas water heater according to the first aspect when executing the programs or instructions.

[0035] In this embodiment, the gas water heater comprises a housing, and a burner, a carbon monoxide (CO) detection device and a fan arranged in the housing. The burner burns gas to output heat to warm up cold water in the gas water heater to form hot water. The fan is usually arranged below the housing, and the fan blows air to the burner when powered on, which can supply oxygen to the burner when working to improve the combustion efficiency of the burner. The carbon monoxide detection device can detect the carbon monoxide concentration in the exhaust gas generated after combustion, and the combustion condition of the gas water heater can be determined by the carbon monoxide concentration, that is, whether the oxygen supply to the burner needs to be increased or decreased, and then the output value of the fan is adjusted. On the one hand, it can ensure that the water heater maintains good combustion condition during combustion operation, avoids the phenomenon of insufficient combustion of the gas water heater, improves the heat production efficiency, on the other hand, ensures the working stability of the gas water heater, improves the use safety of the user, and on the other hand, improves the control precision of the gas water heater, effectively reduces the amount of exhaust gas, and is more environmentally friendly.

[0036] In any of the above technical solutions, further, the gas water heater further comprises: a heat exchanger comprising a water inlet and a water outlet; an exhaust device for collecting and discharging flue gas generated by the burner; the carbon monoxide detection device is located between the burner and the outlet of the exhaust device.

[0037] In the technical scheme, the gas water heater further comprises a heat exchanger and a smoke exhaust device. The heat exchanger and the burner are located in the combustion chamber of the gas water heater. The heat exchanger comprises a water inlet and a water outlet. Cold water flows into the heat exchanger through the water inlet. The burner burns gas to output heat to warm the cold water flowing into the heat exchanger to form hot water. The hot water flows out of the heat exchanger through the water outlet of the heat exchanger, thereby realizing hot water supply. The smoke exhaust passage is connected with the combustion chamber. Waste gas generated by combustion is exhausted out of the gas water heater through the smoke exhaust passage. The carbon monoxide detection device is located between the burner and the outlet of the smoke exhaust device, so that the concentration of carbon monoxide generated by the burner can be accurately detected, and the combustion condition of the gas water heater can be judged according to the concentration of carbon monoxide.

[0038] Specifically, the smoke exhaust device comprises a smoke collecting cover and a smoke exhaust passage which are communicated. The smoke collecting cover is used to collect flue gas generated by the burner, and the flue gas is guided out of the gas water heater through the smoke exhaust passage.

[0039] In any of the above technical schemes, further, the gas water heater further comprises a water temperature detection device connected with the processor and located at the water inlet and the water outlet. The water temperature detection device is used to detect the inlet water temperature and the outlet water temperature of the gas water heater. The gas water heater further comprises a water flow detection device connected with the processor. The water flow detection device is used to detect the water flow rate of the gas water heater.

[0040] In the technical scheme, the gas water heater further comprises a water temperature detection device and a water flow detection device. The water temperature detection device is arranged at the water inlet and the water outlet of the heat exchanger to detect the temperature of cold water entering the heat exchanger and the temperature of hot water flowing out of the heat exchanger, respectively. The water flow rate detected by the water flow detection device reflects the flow rate and flow volume of the cold water. The hot water production rate is calculated according to the outlet water temperature, the inlet water temperature and the water flow rate, so that the first preset concentration range can be flexibly set according to different operating conditions of the gas water heater, the misjudgment caused by equipment aging and other problems is reduced, the control accuracy of the gas water heater is improved, and the efficiency and stability of the fan output value adjustment are ensured.

[0041] In any of the above technical schemes, further, the gas water heater further comprises a gas valve connected with the burner. The gas valve is used to control the gas intake amount of the burner.

[0042] In the technical scheme, the burner is connected with a gas pipeline. The gas pipeline can deliver gas to the burner. The gas valve is installed on the gas pipeline. The proportion of gas and air entering the burner can be adjusted by controlling the opening degree of the gas valve.

[0043] Further, while adjusting the fan output value, the opening degree of the gas valve can also be controlled. For example, when the carbon monoxide concentration is greater than or equal to the first concentration threshold, the fan output value is controlled to decrease by the first offset amount to reduce the amount of air introduced, and at the same time, the opening degree of the gas valve can be appropriately reduced to reduce the amount of gas entering the burner, so as to ensure that the ratio of gas to oxygen can promote complete combustion and improve combustion efficiency while reducing the flue gas generated by the burner.

[0044] According to a third aspect of the present application, a readable storage medium is provided, which has stored thereon a program or instructions, which when executed by a processor, perform the control method of the gas water heater according to the first aspect. Therefore, the readable storage medium has all the advantages of the control method of the gas water heater according to the first aspect.

[0045] Additional aspects and advantages of the present application will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0046] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following detailed description, including the accompanying drawings, in which:

[0047] Figure 1 A flowchart of a control method of a gas water heater in an embodiment of the present application is shown;

[0048] Figure 2 A flowchart of a control method of a gas water heater in another embodiment of the present application is shown;

[0049] Figure 3 A flowchart of a control method of a gas water heater in another embodiment of the present application is shown;

[0050] Figure 4 A flowchart of a control method of a gas water heater in another embodiment of the present application is shown;

[0051] Figure 5 A flowchart of a control method of a gas water heater in another embodiment of the present application is shown;

[0052] Figure 6 A flowchart of a control method of a gas water heater in another embodiment of the present application is shown;

[0053] Figure 7 A schematic block diagram of a gas water heater in an embodiment of the present application is shown;

[0054] Figure 8 A schematic block diagram of a gas water heater in an embodiment of the present application is shown;

[0055] Figure 9 A flowchart illustrating a specific embodiment of the control method for improving the combustion performance and safety of a water heater according to the present invention is shown.

[0056] Figure 10 A schematic block diagram of a gas water heater according to a specific embodiment of the present invention is shown;

[0057] Figure 11 A graph showing the correspondence between the gas valve output value, the fan output value, and the hot water production rate according to a specific embodiment of the present invention is provided.

[0058] Figure 12 A graph showing the relationship between carbon monoxide concentration and hot water yield in a specific embodiment of the present invention is provided.

[0059] Explanation of icon numbers:

[0060] 700 Gas water heater, 702 Burner, 704 Carbon monoxide detection device, 706 Fan, 708 Memory, 710 Processor, 712 Combustion chamber, 714 Smoke exhaust device, 716 Heat exchanger, 718 Gas valve, 720 Water temperature detection device, 722 Water flow detection device, 7142 Smoke hood, 7144 Smoke exhaust duct, 7102 System control unit, 7104 Gas control unit, 7106 Fan control unit. Detailed Implementation

[0061] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0062] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0063] The following reference Figures 1 to 12 A control method for a gas water heater, a gas water heater, and a readable storage medium are described according to some embodiments of the present invention.

[0064] Example 1:

[0065] like Figure 1 As shown, according to an embodiment of the present invention, a control method for a gas water heater is proposed. The gas water heater includes a fan and a burner. The method includes:

[0066] Step 102: Obtain the carbon monoxide concentration produced by the burner;

[0067] Step 104, adjusting the fan output value of the fan according to the carbon monoxide concentration.

[0068] In this embodiment, after receiving the start instruction of the gas water heater, the burner starts to burn the gas to heat the cold water, and the fan is controlled to start running at an initial fan output value. The output end of the fan is arranged close to the burner of the gas water heater to deliver air to the burner, thereby providing sufficient oxygen for the burner. As the gas is continuously burned, a certain amount of waste gas will be generated due to incomplete combustion of part of the gas. The carbon monoxide concentration in the waste gas is detected by the carbon monoxide detection device. The carbon monoxide concentration is used to determine whether the current combustion condition of the gas water heater is abnormal, i.e., whether the gas and air are in an optimal ratio, thereby adjusting the output value of the fan running to increase or decrease the oxygen supply to the burner. On the one hand, it can ensure that the water heater maintains a good combustion condition during the combustion operation, avoids the phenomenon of insufficient combustion of the gas water heater, improves the heat production efficiency, on the other hand, ensures the working stability of the gas water heater, improves the use safety of the user, and on the other hand, improves the control precision of the gas water heater, which can effectively reduce the amount of waste gas and is more environmentally friendly.

[0069] The fan output value is a fan control parameter for adjusting the air volume of the fan.

[0070] Specifically, as shown in Figure 8 The control method provided by the application is used for controlling a gas water heater 700. The gas water heater 700 comprises a shell, a smoke exhaust device 714, a heat exchanger 716, a combustion chamber 712, a burner 702 arranged in the combustion chamber 712, a carbon monoxide (CO) detection device 704, a gas pipeline connected with the burner 702, a gas valve 718 and a fan 706 arranged on the gas pipeline. The heat exchanger 716 comprises a water inlet and a water outlet. Cold water flows into the heat exchanger 716 from the water inlet. The burner 702 burns gas to output heat to warm the cold water flowing into the heat exchanger 716 to form hot water. The hot water flows out of the heat exchanger 716 through the water outlet of the heat exchanger 716. The fan 706 is arranged below the shell. The fan 706 blows air into the combustion chamber 712 when it is powered to work, thereby supplying oxygen to the burner 702 and improving the combustion efficiency of the burner 702. The carbon monoxide detection device 704 is arranged between the burner 702 and the smoke exhaust device 714 to detect the carbon monoxide concentration in the waste gas generated after combustion. The gas valve 718 is selected to adjust the amount of gas input into the burner 702 and the ratio of gas to oxygen.

[0071] It can be understood that, in the case of ignoring the influence factors such as external environment and equipment aging, the hot water yield of the gas water heater can be understood as the standard hot water yield of the gas water heater detected under the condition of using standard gas for combustion. The standard hot water yield of the same model of gas water heater is almost the same, as shown in Figure 11 The corresponding relationship between the gas valve control output value and the fan output value required for the hot water yield is obtained by pre-test verification. Among them, the straight line PR represents the corresponding relationship between different hot water yields and the initial fan output value, and the straight line P represents the corresponding relationship between different hot water yields and the initial gas valve output value. That is, the same model of gas water heater is working according to the relationship curve of the initial gas valve output value, the initial fan output value and the hot water yield at the time of leaving the factory. Figure 11

[0072] It should be noted that the fan power can be adjusted by adjusting the duty cycle or operating frequency or pulse width of the fan, thereby adjusting the fan output value. When the pulse width is fixed, the higher the operating frequency, the greater the power, and the greater the fan output value. When the operating frequency is fixed, the greater the pulse width, the greater the power, and the greater the fan output value. When the pulse width and operating frequency are fixed, the higher the duty cycle, the greater the power, that is, pulse width modulation.

[0073] Embodiment 2:

[0074] As shown in Figure 2 According to one embodiment of the present application, a control method of a gas water heater is provided, which comprises:

[0075] Step 202, obtaining the carbon monoxide concentration generated by the burner;

[0076] Step 204, whether the carbon monoxide concentration exceeds the first preset concentration interval, if yes, entering step 206, if no, entering step 202;

[0077] Step 206, adjusting the fan output value according to the preset offset.

[0078] In this embodiment, the first preset concentration interval is pre-set according to the carbon monoxide data of the gas water heater in the combustion operation under good combustion conditions. If the currently detected carbon monoxide concentration exceeds the first preset concentration interval, it indicates that the gas water heater is in an abnormal combustion condition at this time, and then the fan output value is increased or decreased according to the preset offset, so as to increase or decrease the oxygen supply amount of the fan to the burner, promote the full mixing of gas and air in proper proportion, ensure the stability of the gas composition, make the gas water heater in a safe working state, avoid incomplete combustion and vibration combustion, be more energy-saving and efficient, and balance the usability and safety of the gas water heater.

[0079] ​Further, if the current detected carbon monoxide concentration is within the first preset concentration interval, i.e. the carbon monoxide concentration is less than or equal to the maximum value of the first preset concentration interval and greater than or equal to the minimum value of the first preset concentration interval, it indicates that the gas water heater is in a good combustion state, and the fan output value does not need to be adjusted.

[0080] It can be understood that the gas water heater includes a video output device and / or an audio output device, and when the carbon monoxide concentration exceeds the first preset concentration interval, the video output device and / or the video output device can also output prompt information to prompt the user that the combustion state of the gas water heater is abnormal, and the gas water heater is controlled in time to avoid incomplete combustion and vibration combustion for a long time, damage the gas water heater, and even prevent harm to the human body and the environment.

[0081] Embodiment 3:

[0082] As shown in Figure 3 According to one embodiment of the present application, a control method of a gas water heater is provided, the method comprising:

[0083] Step 302, obtaining the carbon monoxide concentration generated by the burner;

[0084] Step 304, whether the carbon monoxide concentration exceeds the first preset concentration interval, if yes, entering step 306, if no, entering step 302;

[0085] Step 306, whether the carbon monoxide concentration is greater than or equal to the first concentration threshold, if yes, entering step 308, if no, entering step 310;

[0086] Step 308, controlling the fan output value to decrease according to the first preset offset;

[0087] Step 310, whether the carbon monoxide concentration is less than or equal to the second concentration threshold, if yes, entering step 312, if no, entering step 314;

[0088] Step 312, controlling the fan output value to increase according to the second preset offset;

[0089] Step 314, outputting prompt information.

[0090] In this embodiment, when it is determined that the current detected carbon monoxide concentration exceeds the first preset concentration interval, that is, the gas water heater is in an abnormal combustion condition, the carbon monoxide concentration is continuously compared with the first concentration threshold value. If the carbon monoxide concentration is greater than or equal to the first concentration threshold value, it indicates that the current carbon monoxide concentration is too high, and there may be problems such as abnormal gas calorific value, backflow of exhaust smoke, etc. If the gas water heater continues to operate, it is easy to cause danger. At this time, it is necessary to reduce the fan output value of the gas water heater to reduce the amount of air introduced, and then the fan output value is controlled to decrease by the first preset offset amount, so as to reduce the carbon monoxide concentration generated by the burner. If the carbon monoxide concentration is not greater than the first concentration threshold value, the carbon monoxide concentration is compared with the second concentration threshold value. When the carbon monoxide concentration is less than or equal to the second concentration threshold value, it indicates that the current carbon monoxide concentration is too low, and there may be problems such as blockage of the burner air inlet pipe, poor ventilation, etc. At this time, the fan output value is controlled to increase by the second preset offset amount, so as to increase the oxygen supply amount of the fan to the burner and promote sufficient combustion. Thus, when the gas water heater is in an abnormal combustion condition, it can be self-judged, self-adjusted and self-adapted according to the difference of the carbon monoxide concentration, and the condition of gas combustion is more efficient and accurate, so as to ensure that the gas water heater combustion operation is maintained in a good state, avoid problems such as vibration combustion, emission of a large amount of pollution gas after combustion caused by insufficient gas combustion, etc., and further improve the safety of the use of the gas water heater.

[0091] In addition, if the carbon monoxide concentration exceeds the first preset concentration interval, and it is detected that the carbon monoxide concentration is both less than the first concentration threshold value and greater than the second concentration threshold value, it indicates that the judgment mechanism of the gas water heater fails, and a prompt information is outputted so as to facilitate timely maintenance.

[0092] Specifically, the first concentration threshold value is greater than the maximum value of the first preset concentration interval. The first concentration threshold value is greater than the second concentration threshold value. The second concentration threshold value is less than the minimum value of the first preset concentration interval.

[0093] Further, the first concentration threshold value includes multiple sets of values, which can be reasonably set according to the equipment parameters, operation parameters, etc. of the gas water heater. Different first concentration threshold values can correspond to different first preset offset amounts. Moreover, the greater the first concentration threshold value, the greater the first preset offset amount, that is, the first concentration threshold value and the first preset offset amount are positively correlated. Similarly, the second concentration threshold value also includes multiple sets of values, which can be reasonably set according to the equipment parameters, operation parameters, etc. of the gas water heater. Different second concentration threshold values can correspond to the same or different second preset offset amounts. Moreover, the smaller the second concentration threshold value, the greater the second preset offset amount, that is, the second concentration threshold value and the second preset offset amount are negatively correlated. Thus, the fan output value can be flexibly adjusted according to the carbon monoxide concentration, the control accuracy of the gas water heater is improved, the problem of system control deviation of the gas water heater is avoided or reduced, and the problems of incomplete combustion, vibration combustion and waste gas emission, etc. of the gas water heater are further improved.

[0094] Embodiment 4:

[0095] As Figure 4 shown, according to one embodiment of the present application, a control method of a gas water heater is provided, the method comprising:

[0096] Step 402, obtaining the outlet water temperature, inlet water temperature and water flow rate of the gas water heater;

[0097] Step 404, determining the hot water production rate according to the outlet water temperature, inlet water temperature and water flow rate;

[0098] Step 406, determining the first preset concentration interval according to the hot water production rate;

[0099] Step 408, obtaining the carbon monoxide concentration generated by the burner;

[0100] Step 410, whether the carbon monoxide concentration exceeds the first preset concentration interval, if yes, go to step 412, if no, go to step 408;

[0101] Step 412, adjusting the fan output value according to the preset offset.

[0102] In this embodiment, as Figure 12 shown, the corresponding relationship between the hot water production rate of the gas water heater and the first preset concentration interval is pre-configured, before adjusting the fan output value of the fan according to the preset offset, the hot water production rate of the gas water heater is detected or calculated first, and the first preset concentration interval corresponding to the currently obtained hot water production rate is queried through the corresponding relationship between the hot water production rate and the first preset concentration interval. In order to judge the current combustion condition of the gas water heater according to the first preset concentration interval and the carbon monoxide concentration, so as to improve the control accuracy of the gas water heater, improve the efficiency and stability of the adjustment of the fan output value, and meet the adjustment requirements of different models of gas water heaters and different external environment conditions of the gas water heater.

[0103] Wherein, the greater the hot water production rate, the greater the maximum and minimum values of the first preset concentration interval.

[0104] Furthermore, the difference between the outlet and inlet temperatures of the gas water heater is calculated, which is the temperature rise of the gas water heater. The product of this difference and the water flow rate is the hot water production rate. For example, if the inlet temperature of the gas water heater is T1, the outlet temperature is T2, and the water flow rate is Qw, then the temperature difference between the inlet temperature T1 and the outlet temperature T2 is Δt = T2 - T1, and the hot water production rate is C1 = Δt × Qw. This allows for the calculation of the hot water production rate based on the current outlet temperature, inlet temperature, and water flow rate of the gas water heater. This enables flexible setting of the first preset concentration range according to different operating states of the gas water heater, reducing misjudgments caused by equipment aging and other issues, thereby improving the control accuracy of the gas water heater and ensuring the efficiency and stability of fan output adjustment.

[0105] It should be noted that the hot water output rate of a gas water heater reflects the rate at which the heat from gas combustion is converted into hot water. It can be characterized by the quotient of the hot water output rate and the gas consumption rate. Specifically, a suitable air / gas ratio and good combustion conditions result in higher combustion efficiency, meaning that the required hot water output is achieved while using as little gas and as little airflow as possible. The above calculation of the hot water output rate of a gas water heater is just one example; any calculation method that can characterize the efficiency of converting the heat from gas combustion into hot water is acceptable and is not specifically limited here.

[0106] Example 5:

[0107] like Figure 5 As shown, according to an embodiment of the present invention, a control method for a gas water heater is proposed, the method comprising:

[0108] Step 502: Obtain the carbon monoxide concentration produced by the burner;

[0109] Step 504: Does the carbon monoxide concentration exceed the first preset concentration range? If yes, proceed to step 506; if no, proceed to step 502.

[0110] Step 506: Adjust the fan output value according to the preset offset;

[0111] Step 508: Does the fan output value exceed the preset output value range? If yes, proceed to step 510; if no, proceed to step 502.

[0112] Step 510: Control the gas water heater to shut down and / or output alarm information.

[0113] In this embodiment, considering the abnormal adjustment problem of the fan output value caused by the processor failure for controlling the fan output value, the serious blockage of the flue pipe, the wrong gas, the blockage or damage of the heat exchanger, the damage of the burner, the damage of the fan, etc. For this purpose, the size of the fan output value is monitored, and when the fan output value exceeds the preset output value range, that is, the fan output value is greater than or equal to the maximum value allowed for the adjustment of the fan output value, or less than or equal to the minimum value allowed for the adjustment of the fan output value, it indicates that the fan output value is abnormal, which not only easily damages the gas water heater, but also easily causes safety hazards. At this time, the gas water heater is controlled to be closed and / or an alarm information is outputted to reduce the safety risk and ensure that the user can maintain the gas water heater in time.

[0114] Embodiment 6:

[0115] As shown in Figure 6 According to one embodiment of the present application, a control method of a gas water heater is provided, which comprises:

[0116] Step 602, obtaining the carbon monoxide concentration generated by the burner;

[0117] Step 604, whether the carbon monoxide concentration is greater than a third concentration threshold or less than a fourth concentration threshold, if yes, entering step 606, if no, entering step 608;

[0118] Step 606, controlling the gas water heater to be closed and / or outputting an alarm information;

[0119] Step 608, whether the carbon monoxide concentration exceeds a first preset concentration interval, if yes, entering step 610, if no, entering step 602;

[0120] Step 610, adjusting the fan output value according to a preset offset.

[0121] Among them, the third concentration threshold is greater than the fourth concentration threshold.

[0122] In this embodiment, when the carbon monoxide concentration is greater than the third concentration threshold, or the carbon monoxide concentration is less than the fourth concentration threshold, that is, the currently detected carbon monoxide concentration exceeds the safe concentration range of carbon monoxide, the gas water heater is controlled to be closed and / or an alarm information is outputted. Further, effective control of the carbon monoxide content generated by the burner is realized, which not only can effectively prevent the damage of the gas water heater and prolong the service life of the gas water heater, but also can reduce the safety risk and ensure that the user can maintain the gas water heater in time, thereby improving the safety performance of the gas water heater.

[0123] Furthermore, when the carbon monoxide concentration exceeds the third concentration threshold, the filter installed in the gas water heater can be activated to absorb some of the carbon monoxide, thereby reducing the concentration of carbon monoxide discharged from the gas water heater, preventing dangers such as explosions and carbon monoxide poisoning, and further ensuring personal safety.

[0124] Example 7:

[0125] like Figure 7 As shown, according to an embodiment of the second aspect of the present invention, a gas water heater 700 is provided, comprising: a burner 702, a carbon monoxide detection device 704, a fan 706, a memory 708, and a processor 710.

[0126] Specifically, burner 702 is disposed within the casing of gas water heater 700. Burner 702 burns gas to output heat, which heats the cold water in gas water heater 700 to form hot water. Fan 706 is disposed within the casing of gas water heater 700 and located below burner 702. Fan 706 is configured to supply air to burner 702 to provide oxygen during operation, thereby improving combustion efficiency. Carbon monoxide detection device 704 is located above burner 702 and is configured to detect the concentration of carbon monoxide produced by burner 702. When processor 710 executes a program or instruction, it performs the following steps: obtaining the carbon monoxide concentration produced by burner 702; and adjusting the fan output value of fan 706 according to the carbon monoxide concentration.

[0127] In this embodiment, the carbon monoxide detection device 704 can detect the carbon monoxide concentration in the exhaust gas generated after combustion, and determine the current combustion status of the gas water heater 700 based on the carbon monoxide concentration. This determines whether the oxygen supply to the burner 702 needs to be increased or decreased, thereby adjusting the output value of the fan 706. On one hand, this ensures that the water heater maintains good combustion conditions during operation, preventing incomplete combustion and improving heat production efficiency. On the other hand, it guarantees the operational stability of the gas water heater, improving user safety. Furthermore, it enhances the control precision of the gas water heater 700, effectively reducing exhaust gas volume and making it more environmentally friendly.

[0128] Furthermore, the gas water heater 700 also includes an alarm device (not shown in the figure), which is electrically connected to the processor 710; the processor 710 is also used to control the alarm device to output alarm information based on the carbon monoxide concentration and / or the fan output value, so as to promptly remind the user to perform abnormal checks and troubleshoot abnormal problems.

[0129] Example 8:

[0130] like Figure 8As shown, according to one embodiment of the present application, the gas water heater 700 further comprises a combustion chamber 712, a heat exchanger 716 and an exhaust device 714.

[0131] In this embodiment, the combustion chamber 712 is used to accommodate the burner 702, so as to provide sufficient space for gas combustion, and to prevent other elements in the gas water heater 700 from being burned due to flame overflow. Moreover, the combustion chamber 712 is in communication with the exhaust device 714, so that the flue gas generated by gas combustion is discharged from the gas water heater 700 through the exhaust device 714, thereby improving the use safety of the gas water heater 700.

[0132] The heat exchanger 716 and the burner 702 are located in the combustion chamber 712 of the gas water heater 700, the heat exchanger 716 comprises a water inlet and a water outlet, cold water flows into the heat exchanger 716 through the water inlet, the burner 702 burns gas to output heat to warm the cold water flowing into the heat exchanger 716 to form hot water, the hot water flows out of the heat exchanger 716 through the water outlet of the heat exchanger 716, thereby realizing hot water supply. The exhaust device 714 is in communication with the combustion chamber 712, the exhaust gas generated by combustion is discharged from the gas water heater 700 through the exhaust device 714, and the carbon monoxide detection device is located between the burner 702 and the outlet of the exhaust device 714, so that the concentration of carbon monoxide generated by the burner 702 can be accurately detected, which is conducive to judging the combustion condition of the gas water heater 700 according to the concentration of carbon monoxide.

[0133] Specifically, the exhaust device 714 comprises a smoke collecting hood 7142 and an exhaust passage 7144 which are in communication with each other. The smoke collecting hood 7142 is used to collect the flue gas generated by the burner 702, so as to concentrate the dispersed flue gas, which is conducive to detecting the concentration of carbon monoxide in the flue gas by the carbon monoxide detection device, and can prevent the flue gas from overflowing, so as to reduce the influence of the flue gas on the environment or human body. Moreover, the exhaust passage 7144 is used to direct the flue gas collected by the smoke collecting hood 7142, which is conducive to preventing the flue gas discharged from the gas water heater 700 from diffusing outward, and facilitating concentrated treatment of the flue gas.

[0134] Specifically, the carbon monoxide detection device can be arranged in the smoke collecting hood 7142 or in the exhaust passage 7144, so as to improve the accuracy of carbon monoxide concentration detection, which is conducive to judging the combustion condition of the gas water heater 700 according to the concentration of carbon monoxide, facilitating precise control of the gas water heater 700, effectively reducing the amount of exhaust gas, and being more environmentally friendly.

[0135] Embodiment 9:

[0136] According to one embodiment of the present application, the gas water heater further comprises a water temperature detection device and a water flow detection device.

[0137] Specifically, both the water temperature detection device and the water flow detection device are connected to the processor. The water temperature detection device is located at the inlet and outlet of the heat exchanger to collect the inlet and outlet water temperatures of the gas water heater. The water flow detection device is configured to detect the water flow rate of the gas water heater.

[0138] In this embodiment, water temperature detection devices are installed at the inlet and outlet of the heat exchanger to detect the temperature of the cold water entering the heat exchanger and the temperature of the hot water leaving the heat exchanger, respectively. The water flow rate detected by the water flow detection device reflects the velocity and flow rate of the cold water. This allows for the calculation of hot water production rate using the outlet water temperature, inlet water temperature, and water flow rate. This enables the gas water heater to flexibly set a first preset concentration range according to different operating states, reducing misjudgments caused by equipment aging and other issues, thereby improving the control accuracy of the gas water heater and ensuring the efficiency and stability of fan output adjustment.

[0139] Example 10:

[0140] like Figure 8 As shown, according to one embodiment of the present invention, including the features defined in any of the above embodiments, and further: the gas water heater 700 also includes a gas valve 718.

[0141] In detail, the gas valve 718 is connected to the burner 702 and is configured to control the gas intake of the burner 702.

[0142] In this embodiment, a gas pipeline is connected to the burner 702, which can deliver gas to the burner 702. A gas valve 718 is installed on the gas pipeline, and the ratio of gas and air entering the burner 702 can be adjusted by controlling the opening degree of the gas valve 718.

[0143] Furthermore, while adjusting the fan output, the opening of the gas valve 718 can also be controlled. For example, when the carbon monoxide concentration is greater than or equal to a first concentration threshold, the fan output is reduced according to a first offset to decrease the amount of air introduced. At this time, the opening of the gas valve 718 can also be adjusted appropriately to regulate the amount of gas entering the burner 702, ensuring that the ratio of gas to oxygen can promote complete combustion, thereby improving combustion efficiency and reducing the carbon monoxide produced by the burner 702.

[0144] Specifically, the gas valve 718 can be a proportional valve, such as a proportional solenoid valve, and the output value of the gas valve 718 can be understood as a duty cycle of a voltage applied across the gas valve 718 to control the gas flow through the gas valve 718. For example, a duty cycle of 80% can be understood as 80% of the time in a cycle is inputted as a high level (e.g. 20V) and the remaining 20% of the time is inputted as a low level (e.g. 0V). That is, when the duty cycle is 80%, the output value of the gas valve 718 is 80%. It is noted that the greater the output value of the gas valve 718, the greater the opening of the gas valve 718 and the greater the gas flow through the gas valve 718. In other embodiments, the gas valve 718 can be other types of valves, such as a rotary valve, and the output value of the gas valve 718 can be understood as a rotation angle of the rotary valve.

[0145] Embodiment 11

[0146] As shown in FIG. 8, according to one specific embodiment of the present application, a control method for improving the combustion performance and safety of a gas water heater is provided, which comprises the following steps: Figure 9

[0147] Step 802, controlling the gas water heater to operate;

[0148] Step 804, detecting the concentration h of carbon monoxide;

[0149] Step 806, determining whether the concentration h belongs to a first preset concentration interval H2, if yes, going to Step 802, and if no, going to Step 808;

[0150] Step 808, determining whether the concentration h belongs to a second preset concentration interval H1, if yes, going to Step 810, and if no, going to Step 812;

[0151] Step 810, adjusting the output value PR of the fan to PR = PR + dPR, where dPR is a preset offset;

[0152] Step 812, adjusting the output value PR of the fan to PR = PR - dPR, where dPR is a preset offset;

[0153] Step 814, determining whether the output value PR of the fan is greater than an upper limit of the output value of the fan or less than a lower limit of the output value of the fan, if yes, going to Step 816, and if no, going to Step 802;

[0154] Step 816, stopping the operation of the water heater and / or alarming.

[0155] As shown in FIG. 9, according to one specific embodiment of the present application, a control method for improving the combustion performance and safety of a gas water heater is provided, which comprises the following steps: Figure 10 ​As shown, the gas water heater comprises a processor 710, a water temperature detecting device 720, a water flow detecting device 722, and a carbon monoxide detecting device 704, wherein the processor 710 comprises a system control unit 7102, a gas control unit 7104, and a fan control unit 7106. Further, as shown, the optimal installation position of the carbon monoxide detecting device (not shown in the figure) is between the heat exchanger 716 and the outlet of the exhaust device 714. Figure 8

[0156] Specifically, the fan output value is adjusted according to the detected carbon monoxide concentration h to ensure good combustion condition during the combustion operation of the water heater, thereby ensuring the safety of the equipment and the user and improving the safety and usability.

[0157] As shown, the corresponding relationship between the gas valve control output value P and the fan output value PR required for the hot water production rate is tested and verified in advance, and the corresponding relationship is designed and implanted into the system control unit. Figure 11

[0158] When the water heater is operated by burning gas, the carbon monoxide concentration h is first detected, and the corresponding range of the carbon monoxide concentration h is calculated according to Figure 12

[0159] h = H2 (the first preset concentration interval): the combustion operation is in a good state, and the operation is continued.

[0160] h = H1 (less than the minimum value h1 of the first preset concentration interval): PR = PR + dPR is adjusted to maintain the combustion operation in a good state.

[0161] h = H3 (greater than the maximum value h2 of the first preset concentration interval): PR = PR - dPR is adjusted to maintain the combustion operation in a good state.

[0162] When PR > PR_max (the upper limit of the fan output value) or PR < PR_min (the lower limit of the fan output value), the fan output value PR exceeds the threshold value of the allowable fan output value adjustment, and the water heater stops operating and / or alarms.

[0163] In this embodiment, the water heater is controlled by the above-mentioned control method, and the problems of incomplete combustion, vibration combustion, etc. caused by poor ventilation environment, different gas calorific values, and backflow of the exhaust pipe can be solved.

[0164] Embodiment 12:

[0165] According to the embodiment of the third aspect of the present application, a readable storage medium is provided, which stores a program or instructions, and the program or instructions are executed by a processor to realize the control method of the gas water heater in any of the above-mentioned embodiments, thereby having all the beneficial technical effects of the control method of the gas water heater in any of the above-mentioned embodiments.​​​

[0166] wherein the readable storage medium is, for example, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, etc.

[0167] It should be noted that the present application is not limited to the specific configurations and processes described above and shown in the drawings. For the purpose of simplicity, detailed descriptions of known methods are omitted herein. In the above-described embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order of the steps, after understanding the spirit of the present application.

[0168] It should also be noted that the exemplary embodiments mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in an order different from the embodiments, or several steps can be performed simultaneously.

[0169] In the present application, the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integral connection; "connecting" can be direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0170] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like are described to mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0171] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A control method of a gas water heater including a blower and a burner, characterized by, The control method for the gas water heater includes: Obtain the carbon monoxide concentration produced by the burner; The fan output value is adjusted according to the carbon monoxide concentration. The step of adjusting the fan output value according to the carbon monoxide concentration includes: The outlet water temperature, inlet water temperature, and water flow rate of the gas water heater are obtained. The hot water production rate is determined based on the outlet water temperature, the inlet water temperature, and the water flow rate. A first preset concentration range is determined based on the hot water yield; Based on the fact that the carbon monoxide concentration exceeds the first preset concentration range, the fan output value is adjusted according to the preset offset. The step of adjusting the fan output value according to the preset offset includes: Based on the carbon monoxide concentration being greater than or equal to a first concentration threshold, the fan output value is controlled to decrease according to a first preset offset. Based on the carbon monoxide concentration being less than or equal to a second concentration threshold, the fan output value is controlled to increase according to a second preset offset. Wherein, the first concentration threshold is greater than the second concentration threshold; While adjusting the fan output, control the opening of the gas valve; The correspondence between the hot water output rate of the gas water heater and the first preset concentration range is pre-configured, and the first preset concentration range is obtained by querying the correspondence; wherein, the larger the hot water output rate, the larger the maximum and minimum values ​​of the first preset concentration range; the first concentration threshold is greater than the maximum value of the first preset concentration range, and the second concentration threshold is less than the minimum value of the first preset concentration range.

2. The control method for a gas water heater according to claim 1, characterized in that, The larger the first concentration threshold, the larger the first preset offset. The smaller the second concentration threshold, the larger the second preset offset.

3. The control method of the gas water heater according to claim 1 or 2, characterized in that, Also includes: If the fan output value exceeds the preset output value range, control the gas water heater to shut down and / or output alarm information.

4. The control method of the gas water heater according to claim 1 or 2, characterized in that, Also includes: Based on the carbon monoxide concentration being greater than a third concentration threshold, or the carbon monoxide concentration being less than a fourth concentration threshold, the gas water heater is controlled to shut down and / or an alarm message is output; The third concentration threshold is greater than the fourth concentration threshold.

5. The control method of the gas water heater according to claim 1 or 2, characterized in that, Adjusting the fan output of the gas water heater includes: Adjust the duty cycle of the fan; or Adjust the operating frequency of the fan; or Adjust the pulse width of the fan.

6. A gas water heater, characterised by, include: Burner; A fan is used to supply air to the burner; A carbon monoxide detection device is used to obtain the carbon monoxide concentration produced by the burner; A memory that stores programs or instructions; A processor, connected to the memory, the burner, the carbon monoxide detection device, and the fan, executes the program or instructions to implement the steps of the control method for a gas water heater as described in any one of claims 1 to 5.

7. The gas water heater according to claim 6, characterized in that, Also includes: A heat exchanger, the heat exchanger including an inlet and an outlet; A flue gas extraction device for collecting and discharging the flue gas produced by the burner; The carbon monoxide detection device is located between the burner and the outlet of the exhaust device.

8. The gas water heater according to claim 7, characterized in that, Also includes: A water temperature detection device is connected to the processor and located at the water inlet and the water outlet. The water temperature detection device is used to detect the inlet water temperature and the outlet water temperature of the gas water heater. A water flow detection device is connected to the processor and is used to detect the water flow rate of the gas water heater.

9. The gas water heater according to any one of claims 6 to 8, characterized in that, Also includes: A gas valve is connected to the burner and is used to control the gas intake of the burner.

10. A readable storage medium having a program or instructions stored thereon, characterized in that, When the program or the instructions are executed by the processor, the control method for the gas water heater as described in any one of claims 1 to 5 is performed.

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