CN114754497B - Control method of gas water heater, gas water heater and readable storage medium - Google Patents

Abstract

The present invention provides a control method for a gas water heater, a gas water heater and a readable storage medium. The control method for the gas water heater includes: obtaining the carbon monoxide concentration generated by the burner; and controlling the output value of the gas valve according to the carbon monoxide concentration. Thus, the current combustion condition of the gas water heater is judged by the concentration of carbon monoxide, and then the output value of the gas valve is adjusted, which can not only ensure that the water heater maintains a good combustion condition during the combustion operation, avoid the phenomenon of insufficient combustion of the gas water heater, and improve the heat production efficiency, but also ensure the working stability of the gas equipment, improve the user's safety, and improve the control accuracy of the gas water heater, which can effectively reduce the amount of exhaust gas and be more environmentally friendly.

Description

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

Technical Field

The present invention relates to the technical field of gas water heaters, and in particular to a control method for a gas water heater, a gas water heater and a readable storage medium.

Background technique

At present, gas water heaters have become the main water heating appliances on the market. However, due to differences in installation environments, such as poor ventilation, abnormal gas calorific value, backflow of air from exhaust pipes, etc., the gas supply pressure and calorific value vary greatly, making it impossible for gas water heaters to maintain combustion operation under good conditions, which can easily cause problems such as incomplete combustion and vibrating combustion.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, a first aspect of the present invention provides a control method for a gas water heater.

A second aspect of the present invention also provides a gas water heater.

The third aspect of the present invention also provides a readable storage medium.

In view of this, the first aspect of the present invention proposes a control method for a gas water heater, the gas water heater comprising a burner, a gas valve and a carbon monoxide detection device, the gas valve being used to control the gas intake amount of the burner, the control method for the gas water heater comprising: obtaining the carbon monoxide concentration generated by the burner; and controlling the output value of the gas valve according to the carbon monoxide concentration.

The present invention provides a control method. After receiving the start-up instruction of the gas water heater, the gas is introduced according to the initial output value of the gas valve, and the burner starts to burn the gas to heat the cold water. As the gas is continuously burned, a certain amount of waste gas will be generated due to the incomplete combustion of part of the gas. The carbon monoxide concentration in the waste gas is obtained through a carbon monoxide detection device. According to the concentration of carbon monoxide, it is judged whether the current combustion condition of the gas water heater is abnormal, that is, whether the gas and air are in a better ratio, and then the output value of the gas valve is adjusted to increase or decrease the gas intake of the burner. On the one hand, it can ensure that the water heater maintains a good combustion condition during the combustion operation, avoid the phenomenon of insufficient combustion of the gas water heater, and improve the heat production efficiency. On the other hand, it ensures the working stability of the gas equipment, improves the user's use safety, improves the control accuracy of the gas water heater, can effectively reduce the amount of waste gas, and is more environmentally friendly.

Among them, the output value of the gas valve is a gas valve control parameter, which is used to adjust the ventilation volume of the gas valve. The gas valve opening can be adjusted by adjusting the duty cycle, operating frequency, pulse width or pulse amplitude of the gas valve, thereby adjusting the gas valve output value. Specifically, when the pulse width is fixed, the higher the operating frequency, the larger the gas valve opening, and the larger the gas valve output value. When the operating frequency is fixed, the larger the pulse width, the larger the gas valve opening, and the larger the gas valve output value. When the pulse width and operating frequency are fixed, the higher the duty cycle, the larger the gas valve opening, which is pulse width modulation (PWM). Similarly, when the pulse width and operating frequency are fixed, the pulse amplitude can also be adjusted, which is pulse amplitude modulation (Pulse Amplitude Modulation, PAM).

Specifically, the control method provided by the present invention is used to control a gas water heater, which includes a shell, a smoke exhaust device arranged in the shell, a heat exchanger, a combustion chamber, a burner arranged in the combustion chamber, a carbon monoxide (CO) detection device, a gas pipeline connected to the burner, and a gas valve arranged on the gas pipeline. The heat exchanger includes a water inlet and a water outlet, cold water flows into the heat exchanger from the water inlet, the burner burns the 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 of the heat exchanger. The carbon monoxide detection device is arranged at a position between the burner and the smoke exhaust device, and can detect the carbon monoxide concentration in the exhaust gas generated after the combustion is completed. The gas valve can adjust the amount of gas input to the burner and the ratio of gas to oxygen.

The control method of the gas water heater provided by the present invention may also have the following additional technical features:

In the above technical solution, further, the output value of the gas valve is controlled according to the carbon monoxide concentration, including: based on the carbon monoxide concentration exceeding the first preset concentration range, adjusting the output value of the gas valve according to a preset offset.

In this technical solution, a first preset concentration interval is pre-set according to the carbon monoxide data of the gas water heater during combustion operation under good combustion conditions. If the currently detected carbon monoxide concentration exceeds the first preset concentration interval, that is, the carbon monoxide concentration is greater than the maximum value of the first preset concentration interval or less than the minimum value of the first preset concentration interval, indicating that the gas water heater is in an abnormal combustion state at this time, the output value of the gas valve is increased or decreased according to the preset offset, thereby increasing or decreasing the air intake of the burner, promoting full mixing of gas and air, ensuring the stability of the gas composition, and putting the gas water heater in a safe working state, avoiding incomplete combustion and vibration combustion, and being more energy-efficient and efficient, taking into account the usability and safety of the gas water heater.

Furthermore, if the currently 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 means that the gas water heater is in a good combustion condition at this time, and there is no need to adjust the output value of the gas valve.

In any of the above technical solutions, further, adjusting the output value of the gas valve according to a preset offset includes: based on the carbon monoxide concentration being greater than or equal to a first concentration threshold, controlling the output value of the gas valve to increase according to a first preset offset.

In this technical solution, when it is determined that the currently 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 and the first concentration threshold are continuously compared. If the carbon monoxide concentration is greater than or equal to the first concentration threshold, it means that the current carbon monoxide concentration is too high, and there may be problems such as gas calorific value deviation and incomplete combustion of gas, and the hot water yield is low. At this time, it is necessary to increase the gas intake of the gas water heater, and the output value of the gas valve is controlled to increase according to the first preset offset, so as to promote full combustion and meet the heating demand. As a result, when the gas water heater is in an abnormal combustion state, it can self-judge, self-adjust and adapt according to the difference in carbon monoxide concentration, and distinguish the gas combustion state more efficiently and accurately, ensuring that the combustion operation of the gas water heater is maintained in a good state, avoiding vibration combustion caused by incomplete gas combustion, and emitting a large amount of pollutants after combustion. The problem further improves the safety of the gas water heater.

The first concentration threshold is greater than the maximum value of the first preset concentration range.

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

In this technical solution, when it is determined that the currently 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 and the second concentration threshold are continuously compared. If the carbon monoxide concentration is less than or equal to the second concentration threshold, it means that the current carbon monoxide concentration is too low, and there may be problems such as insufficient oxygen. At this time, the output value of the gas valve is controlled to be reduced according to the second preset offset to reduce the gas intake of the burner, promote full combustion, and reduce resource waste. In addition, when the gas water heater is in an abnormal combustion state, it can self-judge, self-adjust and adapt according to the difference in carbon monoxide concentration, and distinguish the gas combustion state more efficiently and accurately, ensuring that the combustion operation of the gas water heater is maintained in a good state, avoiding vibration combustion caused by insufficient gas combustion, and emission of a large amount of pollutants after combustion. Problems such as further improving the safety of the gas water heater.

The first concentration threshold is greater than the second concentration threshold, and the second concentration threshold is less than the minimum value of the first preset concentration range.

In any of the above technical solutions, further, the larger the first concentration threshold is, the larger the first preset offset is; and the smaller the second concentration threshold is, the larger the second preset offset is.

In this technical solution, the first concentration threshold includes multiple sets of values, which can be reasonably set according to the equipment parameters, operating parameters, etc. of the gas water heater, and different first concentration thresholds can correspond to different first preset offsets. Moreover, the larger the first concentration threshold, the larger the first preset offset, that is, the first concentration threshold is positively correlated with the first preset offset. Similarly, the second concentration threshold also includes multiple sets of values, which can be reasonably set according to the equipment parameters, operating parameters, etc. of the gas water heater, and different second concentration thresholds can correspond to the same or different second preset offsets. Moreover, the smaller the second concentration threshold, the larger the second preset offset, that is, the second concentration threshold is negatively correlated with the second preset offset. Thus, the output value of the gas valve can be flexibly adjusted according to the carbon monoxide concentration, the control accuracy of the gas water heater can be improved, the problem of system control deviation in the gas water heater can be avoided or reduced, and the problems of incomplete combustion, vibrating combustion and high exhaust gas emissions of the gas water heater can be improved.

In any of the above technical solutions, further, before adjusting the output value of the gas valve according to the preset offset, it also includes: obtaining the hot water yield of the gas water heater; and determining a first preset concentration range according to the hot water yield.

In this technical solution, the correspondence between the hot water yield of the gas water heater and the first preset concentration interval is preconfigured. Before adjusting the output value of the gas valve according to the preset offset, the hot water yield of the gas water heater is first detected or calculated, and the first preset concentration interval corresponding to the currently obtained hot water yield is queried through the correspondence between the hot water yield and the first preset concentration interval. This facilitates judging the current combustion status of the gas water heater according to the first preset concentration interval and the carbon monoxide concentration, thereby improving the control accuracy of the gas water heater, improving the efficiency and stability of adjusting the output value of the gas valve, and being able to meet the adjustment requirements of different models of gas water heaters and gas water heaters under different external environments.

Among them, the greater the hot water output rate, the greater the maximum and minimum values of the first preset concentration range.

In any of the above technical solutions, further, obtaining the hot water yield of the gas water heater includes: obtaining the outlet water temperature, inlet water temperature and water flow rate of the gas water heater; and determining the hot water yield based on the outlet water temperature, inlet water temperature and water flow rate.

In this technical solution, the difference between the outlet water temperature and the inlet water temperature of the gas water heater is calculated, that is, the temperature rise value of the gas water heater. The product of this difference and the water flow rate is the hot water yield. Therefore, the hot water yield can be calculated according to the current outlet water temperature, inlet water temperature and water flow rate of the gas water heater, so as to flexibly set the first preset concentration interval according to the different operating states of the gas water heater, reduce the misjudgment caused by equipment aging and other problems, and then improve the control accuracy of the gas water heater, and ensure the efficiency and stability of the output value adjustment of the gas valve.

In any of the above technical solutions, further, the control method of the gas water heater also includes: based on the output value of the gas valve exceeding the preset output value range, controlling the gas water heater to shut down and/or outputting an alarm message.

In this technical solution, considering the gas valve failure, serious smoke pipe blockage, wrong gas use, heat exchanger blockage or damage, burner damage and other situations, the gas valve output value cannot be adjusted within the preset output value range, resulting in abnormal adjustment of the gas valve output value. To this end, the gas valve output value is monitored. When the gas valve output value exceeds the preset output value range, that is, the gas valve output value is greater than the maximum value of the gas valve output value adjustment allowed, or less than the minimum value of the gas valve output value adjustment allowed, it means that the current gas valve output value is abnormal, which is not only easy to damage the gas water heater, but also very likely to cause safety hazards. At this time, the gas water heater is controlled to shut down and/or output alarm information to reduce safety risks and ensure that users can perform timely maintenance on the gas water heater.

Specifically, the maximum value and the minimum value allowed for adjusting the output value of the gas valve may be the output value when the gas valve is fully opened or closed, or may be the output value corresponding to the opening of the gas valve set as required.

In any of the above technical solutions, further, the control method of the gas water heater also includes: based on the carbon monoxide concentration exceeding the second preset concentration range, controlling the gas water heater to shut down and/or outputting an alarm message.

In this technical solution, if it is detected that the currently detected carbon monoxide concentration exceeds the second preset concentration interval, that is, the safe concentration range of carbon monoxide, the gas water heater is controlled to be turned off and/or an alarm message is output. In this way, the carbon monoxide content generated by the burner is effectively controlled, which can not only effectively prevent the gas water heater from being damaged and extend the service life of the gas water heater, but also reduce safety risks, ensure that users can perform timely maintenance on the gas water heater, and improve the safety performance of the gas water heater.

In any of the above technical solutions, further, the gas water heater also includes a fan, and before or after controlling the output value of the gas valve according to the carbon monoxide concentration, it also includes: adjusting the duty cycle of the fan according to the carbon monoxide concentration.

In this technical solution, the duty cycle of the fan can be adjusted according to the carbon monoxide concentration before or after adjusting the output value of the gas valve, so that an appropriate amount of air can be delivered to the burner through the fan to meet the oxygen required for gas combustion, which is beneficial to improving the combustion efficiency of the burner.

According to the second aspect of the present invention, a gas water heater is also proposed, comprising: a shell; a burner, arranged in the shell; a gas valve, connected to the burner, the gas valve is used to control the gas intake of the gas water heater; a carbon monoxide detection device, used to obtain the carbon monoxide concentration generated by the burner; a memory, the memory storing a program or instruction; a processor, connected to the memory, the burner, the carbon monoxide detection component and the gas valve, and when the processor executes the program or instruction, it implements the steps of the gas water heater control method proposed in the technical solution of the first aspect.

In this embodiment, the gas water heater includes a shell, and a burner, a carbon monoxide (CO) detection device and a gas valve arranged in the shell. The burner burns the gas to output heat to heat up the cold water in the gas water heater to form hot water. The gas valve can adjust the amount of gas input to the burner and the ratio of gas to oxygen. The carbon monoxide detection device can detect the concentration of carbon monoxide in the exhaust gas generated after the combustion is completed, and the current combustion condition of the gas water heater can be judged according to the concentration of carbon monoxide, that is, whether it is necessary to increase or decrease the gas intake of the burner, and then adjust the output value of the gas valve. On the one hand, it can ensure that the water heater maintains a good combustion condition during the combustion operation, avoid the phenomenon of insufficient combustion in the gas water heater, and improve the heat production efficiency. On the other hand, it improves the control accuracy of the gas water heater, can effectively reduce the amount of exhaust gas, and is more environmentally friendly.

Specifically, the burner is connected to a gas pipeline, which can transport gas to the burner. A gas valve is installed on the gas pipeline, and the ratio of gas and air entering the burner can be adjusted by controlling the opening of the gas valve.

In any of the above technical solutions, further, the gas water heater also includes: a heat exchanger, the heat exchanger includes a water inlet and a water outlet; a smoke exhaust device, used to collect and discharge smoke generated by the burner; a carbon monoxide detection device is located between the burner and the outlet of the smoke exhaust device.

In this technical solution, the gas water heater also includes 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 includes a water inlet and a water outlet. Cold water flows into the heat exchanger from the water inlet. The burner burns the gas to output heat to heat up 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 channel is connected to the combustion chamber, and the exhaust gas generated by the combustion is discharged from the gas water heater through the smoke exhaust channel. The carbon monoxide detection device is located between the outlets of the burner and the smoke exhaust device, so that the concentration of carbon monoxide generated by the burner can be accurately detected, which is conducive to judging the combustion condition of the gas water heater according to the concentration of carbon monoxide.

Furthermore, a through hole for air to enter is provided on the side wall of the combustion chamber, and external air can directly enter the combustion chamber through the through hole to supply oxygen to the burner.

Specifically, the smoke exhaust device includes a smoke collecting hood and a smoke exhaust channel which are connected. The smoke generated by the burner is collected by the smoke collecting hood, and the smoke is guided out of the gas water heater through the smoke exhaust channel.

In any of the above technical solutions, the gas water heater further includes: a water temperature detection device, connected to the processor and located at the water inlet and the water outlet, the water temperature detection device is used to detect the water inlet temperature and the water outlet temperature of the gas water heater; a water flow detection device, connected to the processor, the water flow detection device is used to detect the water flow rate of the gas water heater.

In this technical solution, the gas water heater also includes a water temperature detection device and a water flow detection device. Among them, the water temperature detection device is arranged at the water inlet and the water outlet of the heat exchanger to respectively detect the temperature of cold water entering the heat exchanger and the temperature of hot water flowing out of the heat exchanger. The water flow rate detected by the water flow detection device reflects the flow rate and flow of cold water. In order to calculate the hot water yield by the outlet water temperature, the inlet water temperature and the water flow rate, the gas water heater can flexibly set the first preset concentration interval according to the different operating states of the gas water heater, reduce the misjudgment caused by problems such as equipment aging, and thus improve the control accuracy of the gas water heater, and ensure the efficiency and stability of the adjustment of the output value of the gas valve.

In any of the above technical solutions, further, the gas water heater also includes: a fan connected to the processor, and the fan is used to transport air to the burner.

In this technical solution, the fan is arranged below the housing, and when the fan is powered on, it blows air into the combustion chamber, or the fan is arranged above the housing, and when the fan is powered on, it sucks air into the combustion chamber, thereby supplying oxygen to the burner when it is working. Before or after adjusting the output value of the gas valve, the duty cycle of the fan can be adjusted according to the carbon monoxide concentration, so that the appropriate amount of air can be delivered to the burner through the fan, thereby meeting the oxygen required for gas combustion, which is beneficial to improving the combustion efficiency of the burner.

According to the third aspect of the present invention, a readable storage medium is also provided, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the control method of the gas water heater provided in the first aspect is executed. Therefore, the readable storage medium has all the beneficial effects of the control method of the gas water heater provided in the first aspect.

Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 is a schematic flow chart showing a method for controlling a gas water heater in one embodiment of the present invention;

FIG2 is a schematic flow chart showing a method for controlling a gas water heater according to another embodiment of the present invention;

FIG3 is a schematic flow chart showing a method for controlling a gas water heater according to another embodiment of the present invention;

FIG4 is a schematic flow chart showing a method for controlling a gas water heater according to another embodiment of the present invention;

FIG5 is a schematic flow chart showing a method for controlling a gas water heater according to another embodiment of the present invention;

FIG6 is a schematic flow chart showing a method for controlling a gas water heater according to another embodiment of the present invention;

FIG7 shows a schematic block diagram of a gas water heater according to an embodiment of the present invention;

FIG8 shows a schematic structural diagram of a gas water heater according to an embodiment of the present invention;

FIG9 is a schematic flow chart showing a method for controlling a gas water heater according to a specific embodiment of the present invention;

FIG10 shows a schematic block diagram of a gas water heater according to a specific embodiment of the present invention;

FIG11 is a graph showing a corresponding relationship between a gas valve output value and a hot water production rate according to a specific embodiment of the present invention;

FIG. 12 shows a graph showing the corresponding relationship between carbon monoxide concentration and hot water production rate according to a specific embodiment of the present invention.

Description of Figure Numbers:

700 gas water heater, 702 burner, 704 carbon monoxide detection device, 706 gas valve, 708 memory, 710 processor, 712 combustion chamber, 714 smoke exhaust device, 716 heat exchanger, 720 water temperature detection device, 722 water flow detection device, 7142 smoke hood, 7144 smoke exhaust channel, 7102 system control unit, 7104 gas control unit.

Detailed ways

In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

The following describes a control method for a gas water heater, a gas water heater, and a readable storage medium according to some embodiments of the present invention with reference to FIGS. 1 to 12 .

Embodiment 1:

As shown in FIG1 , according to an embodiment of the present invention, a control method for a gas water heater is proposed. The gas water heater includes a burner, a carbon monoxide detection device and a gas valve. The method includes:

Step 102, obtaining the carbon monoxide concentration generated by the burner;

Step 104, adjusting the output value of the gas valve according to the carbon monoxide concentration.

In this embodiment, after receiving the start-up instruction of the gas water heater, the gas is introduced according to the initial output value of the gas valve, and the burner starts to burn the gas to heat the cold water. As the gas is continuously burned, a certain amount of waste gas will be generated due to the incomplete combustion of part of the gas. The carbon monoxide concentration in the waste gas is obtained through the carbon monoxide detection device. According to the concentration of carbon monoxide, it is judged whether the current combustion condition of the gas water heater is abnormal, that is, whether the gas and air are in a better ratio, and then the output value of the gas valve is adjusted. On the one hand, it can ensure that the water heater maintains a good combustion condition during the combustion operation, avoid the phenomenon of incomplete combustion of the gas water heater, and improve the heat production efficiency. On the other hand, it ensures the working stability of the gas equipment, improves the user's use safety, and improves the control accuracy of the gas water heater, which can effectively reduce the amount of waste gas and be more environmentally friendly.

Among them, the gas valve opening can be adjusted by adjusting the duty cycle, operating frequency, pulse width or pulse amplitude of the gas valve, thereby adjusting the gas valve output value. Specifically, when the pulse width is fixed, the higher the operating frequency, the larger the gas valve opening, and the greater the gas valve output value. When the operating frequency is fixed, the larger the pulse width, the larger the gas valve opening, and the greater the gas valve output value. When the pulse width and operating frequency are fixed, the higher the duty cycle, the larger the gas valve opening, which is pulse width modulation. Similarly, when the pulse width and operating frequency are fixed, the pulse amplitude can also be adjusted, which is pulse amplitude modulation.

Specifically, as shown in FIG8 , the control method provided by the present invention is used to control a gas water heater 700, wherein the gas water heater 700 includes a housing, a smoke exhaust device 714 is arranged in the housing, 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 to the burner 702, and a gas valve 706 is arranged on the gas pipeline. The heat exchanger 716 includes a water inlet and a water outlet, cold water flows into the heat exchanger 716 from the water inlet, the burner 702 burns the gas to output heat to heat up the cold water flowing into the heat exchanger 716 to form hot water, and the hot water flows out of the heat exchanger 716 through the water outlet of the heat exchanger 716. The carbon monoxide detection device 704 is arranged at a position between the burner 702 and the smoke exhaust device 714, and can detect the carbon monoxide concentration in the exhaust gas generated after the combustion is completed. The gas valve 706 can adjust the amount of gas input to the burner 702 and the ratio of gas to oxygen.

The gas valve 706 may be a proportional valve, such as a proportional solenoid valve, and the voltage across the gas valve 706 may be used to control the gas flow through the gas valve 706. The output value of the gas valve 706 in this embodiment may be understood as the duty cycle of the voltage applied across the gas valve 706. For example, a duty cycle of 80% may be understood as a high level input (such as 20V) for 80% of the time in a cycle, and a low level input (such as 0V) for the remaining 20% of the time. In other words, when the duty cycle is 80%, the output value of the gas valve 706 is 80%. It should be noted that the greater the output value of the gas valve 706, the greater the opening of the gas valve 706, and the greater the gas flow through the gas valve 706. In other embodiments, the gas valve 706 may be other valves, such as a rotary valve, and the output value of the gas valve 706 may be understood as the rotation angle of the rotary valve.

Embodiment 2:

As shown in FIG. 2 , according to an embodiment of the present invention, a control method for a gas water heater is proposed, the method comprising:

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

Step 204, whether the carbon monoxide concentration exceeds the first preset concentration range, if yes, proceed to step 206, if no, proceed to step 202;

Step 206, adjusting the output value of the gas valve according to the preset offset.

In this embodiment, a first preset concentration interval is pre-set according to the carbon monoxide data of the gas water heater during combustion operation under good combustion conditions. If the currently detected carbon monoxide concentration exceeds the first preset concentration interval, that is, the carbon monoxide concentration is greater than the maximum value of the first preset concentration interval or less than the minimum value of the first preset concentration interval, indicating that the gas water heater is in an abnormal combustion state at this time, the output value of the gas valve is increased or decreased according to the preset offset, thereby increasing or decreasing the air intake of the burner, promoting full mixing of gas and air, ensuring the stability of the gas composition, and putting the gas water heater in a safe working state, avoiding incomplete combustion and vibration combustion, and being more energy-efficient and efficient, taking into account the usability and safety of the gas water heater.

Furthermore, if the currently 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 means that the gas water heater is in a good combustion condition at this time, and there is no need to adjust the output value of the gas valve.

It is understandable that the gas water heater includes a video output device and/or an audio output device. When the carbon monoxide concentration exceeds the first preset concentration range, a prompt message can also be output through the video output device and/or the video output device to remind the user that the combustion condition of the gas water heater is abnormal, that is, the current combustion efficiency is low, so that the user can check the cause of the abnormality in time and eliminate the cause of the abnormality to avoid long-term incomplete combustion and vibration combustion, damage to the gas water heater, and even prevent harm to the human body and the environment.

Embodiment 3:

As shown in FIG3 , according to an embodiment of the present invention, a control method for a gas water heater is proposed, the method comprising:

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

Step 304, whether the carbon monoxide concentration exceeds the first preset concentration range, if yes, proceed to step 306, if no, proceed to step 302;

Step 306, whether the carbon monoxide concentration is greater than or equal to the first concentration threshold, if so, proceed to step 308, if not, proceed to step 310;

Step 308, controlling the output value of the gas valve to increase according to the first preset offset;

Step 310, whether the carbon monoxide concentration is less than or equal to the second concentration threshold, if so, proceed to step 312, if not, proceed to step 314;

Step 312, controlling the gas valve output value to decrease according to the second preset offset;

Step 314: output prompt information.

In this embodiment, when it is determined that the currently detected carbon monoxide concentration exceeds the first preset concentration interval, that is, when the gas water heater is in an abnormal combustion state, the carbon monoxide concentration and the first concentration threshold value are continuously compared. If the carbon monoxide concentration is greater than or equal to the first concentration threshold value, it means that the current carbon monoxide concentration is too high, and there may be problems such as gas calorific value deviation and incomplete combustion of gas, and the hot water yield is low. At this time, it is necessary to increase the gas intake of the gas water heater, and the output value of the gas valve is controlled to increase according to the first preset offset, so as to promote full combustion and meet the heating demand. If the carbon monoxide concentration is less than or equal to the second concentration threshold value, it means that the current carbon monoxide concentration is too low, and there may be problems such as insufficient oxygen. At this time, the output value of the gas valve is controlled to decrease according to the second preset offset to reduce the gas intake of the burner, promote full combustion, and reduce resource waste. As a result, when the gas water heater is under abnormal combustion conditions, it can self-judge, self-adjust and adapt according to the difference in carbon monoxide concentration, distinguish the gas combustion conditions more efficiently and accurately, ensure that the combustion operation of the gas water heater is maintained in a good state, avoid problems such as vibrating combustion and emission of large amounts of polluting gases after combustion caused by incomplete gas combustion, and further improve the safety of the use of gas water heaters.

Specifically, the first concentration threshold is greater than the maximum value of the first preset concentration interval, the first concentration threshold is greater than the second concentration threshold, and the second concentration threshold is less than the minimum value of the first preset concentration interval.

In addition, if the carbon monoxide concentration exceeds the first preset concentration range, and the carbon monoxide concentration is detected to be both less than the first concentration threshold and greater than the second concentration threshold, it means that the judgment mechanism of the gas water heater has failed, and a prompt message is output to facilitate timely maintenance.

Furthermore, the first concentration threshold includes multiple sets of values, which can be reasonably set according to the equipment parameters, operating parameters, etc. of the gas water heater, and different first concentration thresholds can correspond to different first preset offsets. Moreover, the larger the first concentration threshold, the larger the first preset offset, that is, the first concentration threshold is positively correlated with the first preset offset. Similarly, the second concentration threshold also includes multiple sets of values, which can be reasonably set according to the equipment parameters, operating parameters, etc. of the gas water heater, and different second concentration thresholds can correspond to the same or different second preset offsets. Moreover, the smaller the second concentration threshold, the larger the second preset offset, that is, the second concentration threshold is negatively correlated with the second preset offset. Thus, the operation deviation of the gas water heater can be monitored according to the carbon monoxide concentration, and the output value of the gas valve can be flexibly adjusted to improve the control accuracy of the gas water heater, thereby improving the problems of incomplete combustion, vibration combustion and high exhaust gas emissions of the gas water heater, so as to maintain equipment and personal safety.

Embodiment 4:

As shown in FIG4 , according to an embodiment of the present invention, a control method for a gas water heater is proposed, the method comprising:

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

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

Step 406, determining a first preset concentration range according to the hot water production rate;

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

Step 410, whether the carbon monoxide concentration exceeds the first preset concentration range, if yes, proceed to step 412, if no, proceed to step 408;

Step 412, adjusting the output value of the gas valve according to the preset offset.

In this embodiment, as shown in FIG12 , the correspondence between the hot water yield of the gas water heater and the first preset concentration interval is preconfigured, and before adjusting the output value of the gas valve according to the preset offset, the hot water yield of the gas water heater is first detected or calculated, and the first preset concentration interval corresponding to the currently obtained hot water yield is queried through the correspondence between the hot water yield and the first preset concentration interval. This facilitates judging the current combustion status of the gas water heater according to the first preset concentration interval and the carbon monoxide concentration, thereby improving the control accuracy of the gas water heater, improving the efficiency and stability of adjusting the output value of the gas valve, and being able to meet the adjustment requirements of different models of gas water heaters and gas water heaters under different external environments.

Furthermore, the difference between the outlet water temperature and the inlet water temperature of the gas water heater is calculated, that is, the temperature rise value of the gas water heater. The product of this difference and the water flow rate is the hot water yield. For example, the inlet water temperature of the gas water heater is T1, the outlet water temperature of the gas water heater is T2, and the water flow rate of the gas water heater is Qw, then the temperature difference Δt between the inlet water temperature T1 and the outlet water temperature T2 is Δt=T2-T1, and the hot water yield C1=Δt×Qw. Thus, the hot water yield can be calculated based on the current outlet water temperature, inlet water temperature and water flow rate of the gas water heater, so as to flexibly set the first preset concentration interval according to the different operating states of the gas water heater, reduce misjudgments caused by equipment aging and other problems, and thus improve the control accuracy of the gas water heater, and ensure the efficiency and stability of the adjustment of the output value of the gas valve.

It should be noted that the hot water yield of a gas water heater reflects a parameter of the rate at which the heat of gas combustion is converted into hot water. The combustion efficiency of the gas can be characterized by the commercial ratio of the hot water yield and the gas consumption rate. Specifically, when the current oxygen content meets the requirements for complete combustion of the gas, the greater the output value of the gas valve, the greater the gas input, the greater the heat generated by the combustion, and the greater the hot water yield. The above calculation of the hot water yield of a gas water heater is only one example. As long as it can be used to characterize the efficiency of converting the heat of gas combustion into hot water, any calculation method is acceptable and is not specifically limited here.

In addition, since the greater the output value of the gas valve, the greater the gas intake through the gas valve, the greater the gas heat generated, and the greater the temperature difference between the inlet water temperature of the gas water heater and the outlet water temperature of the gas water heater, and the hot water yield can be calculated by the inlet water temperature, the outlet water temperature and the water flow rate through the gas water heater, that is, there is a corresponding relationship between the output value of the gas valve and the hot water yield, as shown in Figure 11, one gas valve output value corresponds to one hot water yield. The output value P of the gas valve is basically linearly positively correlated with the hot water yield.

Embodiment 5:

As shown in FIG5 , according to an embodiment of the present invention, a control method for a gas water heater is proposed, the method comprising:

Step 502, obtaining the carbon monoxide concentration generated by the burner;

Step 504, whether the carbon monoxide concentration exceeds the first preset concentration range, if yes, proceed to step 506, if no, proceed to step 502;

Step 506, adjusting the output value of the gas valve according to the preset offset;

Step 508, whether the output value of the gas valve exceeds the preset output value range, if so, go to step 510, if not, go to step 502;

Step 510, controlling the gas water heater to shut down and/or outputting an alarm message.

In this embodiment, the problem of abnormal adjustment of the output value of the gas valve caused by gas valve failure and the like is taken into consideration. To this end, the output value of the gas valve is monitored. When the output value of the gas valve exceeds the preset output value range, that is, the output value of the gas valve is greater than the maximum value of the output value adjustment allowed by the gas valve, or is less than the minimum value of the output value adjustment allowed by the gas valve, it indicates that the output value of the current gas valve is abnormal, which is not only easy to damage the gas water heater, but also very likely to cause safety hazards. At this time, the gas water heater is controlled to shut down and/or output an alarm message to reduce safety risks and ensure that users can perform timely maintenance on the gas water heater.

Specifically, the maximum value and the minimum value allowed for adjusting the output value of the gas valve may be the output value when the gas valve is fully opened or closed, or may be the output value corresponding to the opening of the gas valve set as required.

Embodiment 6:

As shown in FIG6 , according to an embodiment of the present invention, a control method for a gas water heater is proposed, the method comprising:

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

Step 604, whether the carbon monoxide concentration exceeds the second preset concentration range, if yes, proceed to step 606, if no, proceed to step 608;

Step 606, controlling the gas water heater to shut down and/or outputting an alarm message;

Step 608, whether the carbon monoxide concentration exceeds the first preset concentration range, if so, proceed to step 610, if not, proceed to step 602;

Step 610, adjusting the output value of the gas valve according to the preset offset, and adjusting the duty cycle of the fan according to the carbon monoxide concentration.

In this embodiment, if it is detected that the currently detected carbon monoxide concentration exceeds the second preset concentration interval, that is, the safe concentration range of carbon monoxide, the gas water heater is controlled to be turned off and/or an alarm message is output. This effectively controls the carbon monoxide content generated by the burner, which can not only effectively prevent the gas water heater from being damaged and extend the service life of the gas water heater, but also reduce safety risks, ensure that users can perform timely maintenance on the gas water heater, and improve the safety performance of the gas water heater. Moreover, before or after adjusting the output value of the gas valve, the duty cycle of the fan can be adjusted according to the carbon monoxide concentration, so that an appropriate amount of air can be delivered to the burner through the fan, thereby meeting the oxygen required for gas combustion, which is beneficial to improving the combustion efficiency of the burner.

For example, when the carbon monoxide concentration is greater than or equal to the first concentration threshold, the output value of the gas valve is controlled to increase according to the first offset to increase the amount of gas introduced. At this time, the duty cycle of the fan can also be reduced according to the third offset to reduce the amount of oxygen delivered to the burner, thereby reducing the smoke generated by the burner while ensuring that the ratio of gas to oxygen can promote complete combustion and improve combustion efficiency.

Furthermore, when the detected carbon monoxide concentration exceeds the second preset concentration range, the carbon monoxide conversion set in the gas water heater can also be started to convert part of the carbon monoxide into carbon dioxide, thereby reducing the concentration of carbon monoxide discharged from the gas water heater, preventing the occurrence of dangers such as explosion and carbon monoxide poisoning, and further ensuring personal safety.

In addition, 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 according to the carbon monoxide concentration and/or the fan output value, so as to promptly remind the user to perform abnormal inspections and eliminate abnormal problems.

Embodiment 7:

As shown in FIG. 7 , according to an embodiment of the second aspect of the present invention, a gas water heater 700 is proposed, including: a burner 702 , a carbon monoxide detection device 704 , a gas valve 706 , a memory 708 and a processor 710 .

In detail, the burner 702 is arranged in the shell of the gas water heater 700, and the burner 702 burns gas to output heat to heat up the cold water in the gas water heater 700 to form hot water. The carbon monoxide detection device 704 is located above the burner 702, and the carbon monoxide detection device 704 is configured to detect the concentration of carbon monoxide generated by the burner 702. The gas valve 706 is connected to the burner 702, and the gas valve 706 is used to control the gas intake of the gas water heater 700. When the processor 710 executes the program or instruction, the following steps are implemented: obtaining the carbon monoxide concentration generated by the burner 702; adjusting the output value of the gas valve 706 according to the carbon monoxide concentration.

In this embodiment, the carbon monoxide detection device 704 can detect the concentration of carbon monoxide in the exhaust gas generated after the combustion is completed, and the current combustion status of the gas water heater 700 can be judged by the concentration of carbon monoxide, that is, whether it is necessary to increase or decrease the gas intake of the burner 702, and then adjust the output value of the gas valve 706. On the one hand, it can ensure that the water heater maintains a good combustion condition during the combustion operation, avoid the phenomenon of insufficient combustion of the gas water heater 700, and improve the heat production efficiency. On the other hand, it can ensure the working stability of the gas equipment, improve the user's safety, improve the control accuracy of the gas water heater 700, and effectively reduce the amount of exhaust gas, which is more environmentally friendly.

Specifically, the burner 702 is connected to a gas pipeline, which can transport gas to the burner 702. A gas valve 706 is installed on the gas pipeline, and the ratio of gas and air entering the burner 702 can be adjusted by controlling the opening of the gas valve 706.

Embodiment 8:

As shown in FIG. 8 , according to an embodiment of the present invention, it includes the features defined in any of the above embodiments, and further: the gas water heater 700 also includes: a combustion chamber 712 , a heat exchanger 716 and a smoke exhaust device 714 .

In this embodiment, the combustion chamber 712 is used to accommodate the burner 702, thereby providing sufficient space for gas combustion and preventing other components in the gas water heater 700 from burning due to flame spillage. In addition, the combustion chamber 712 is connected to the smoke exhaust device 714, so that the smoke generated by the gas combustion is discharged from the gas water heater 700 through the smoke exhaust device 714, thereby improving the safety of the gas water heater 700.

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 includes a water inlet and a water outlet. Cold water flows into the heat exchanger 716 from the water inlet. The burner 702 burns the gas to output heat to heat up 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 smoke exhaust device 714 is connected to the combustion chamber 712. The exhaust gas generated by the combustion is discharged from the gas water heater 700 through the smoke exhaust device 714. The carbon monoxide detection device is located between the burner 702 and the outlet of the smoke 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 status of the gas water heater 700 according to the concentration of carbon monoxide.

Specifically, the smoke exhaust device 714 includes a smoke hood 7142 and a smoke exhaust channel 7144 that are interconnected. The smoke generated by the burner 702 is collected by the smoke hood 7142, and the dispersed smoke is concentrated, which is conducive to the carbon monoxide detection device to detect the carbon monoxide concentration in the smoke, and can prevent the smoke from overflowing, so as to reduce the impact of the smoke on the environment or human body. In addition, by setting the smoke exhaust channel 7144 to directional guide the smoke collected by the smoke hood 7142, it is conducive to preventing the smoke discharged from the gas water heater 700 from diffusing outward, and it is convenient to centrally treat the smoke.

Specifically, the carbon monoxide detection device can be set in the smoke hood 7142 or in the smoke exhaust channel 7144, so as to improve the accuracy of carbon monoxide concentration detection, which is beneficial to judge the combustion condition of the gas water heater 700 according to the concentration of carbon monoxide, and facilitates precise control of the gas water heater 700, which can effectively reduce the amount of exhaust gas and be more environmentally friendly.

Embodiment 9:

According to an embodiment of the present invention, it includes the features defined in any of the above embodiments, and further: the gas water heater also includes a water temperature detection device and a water flow detection device.

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

In this embodiment, the water temperature detection device is arranged at the water inlet and the water outlet of the heat exchanger to detect the temperature of the cold water entering the heat exchanger and the temperature of the hot water flowing out of the heat exchanger respectively. The water flow detection device can be arranged at the water inlet, and the water flow rate detected by the water flow detection device reflects the flow rate and flow of the cold water. In order to calculate the hot water yield by the outlet water temperature, the inlet water temperature and the water flow rate, the gas water heater can flexibly set the first preset concentration interval according to the different operating states of the gas water heater, reduce the misjudgment caused by the aging of the equipment and other problems, and then improve the control accuracy of the gas water heater, and ensure the efficiency and stability of the adjustment of the output value of the gas valve.

Embodiment 10:

According to an embodiment of the present invention, it includes the features defined in any one of the above embodiments, and further: the gas water heater also includes a fan.

In detail, the fan is connected to the processor, and the fan is configured to deliver air to the burner.

In this embodiment, the fan is arranged below the housing, and the fan is powered on to blow air into the combustion chamber, or the fan is arranged above the housing, and the fan is powered on to suck air into the combustion chamber, so that oxygen can be supplied to the burner when it is working. Before or after adjusting the output value of the gas valve, the duty cycle of the fan can be adjusted according to the carbon monoxide concentration, so that an appropriate amount of air can be delivered to the burner through the fan, thereby meeting the oxygen required for gas combustion, which is beneficial to improving the combustion efficiency of the burner.

Furthermore, when the fan is arranged above the shell, a through hole for air to enter is opened on the side wall of the combustion chamber, and external air can directly enter the combustion chamber through the through hole to supply oxygen to the burner.

Embodiment 11:

As shown in FIG9 , according to a specific embodiment of the present invention, a control method for improving the combustion performance and safety of a water heater is proposed, comprising:

Step 802, controlling the operation of the gas water heater;

Step 804, detecting the concentration h of carbon monoxide;

Step 806, whether the concentration h belongs to the first preset concentration interval H2, if yes, go to step 802, if no, go to step 808;

Step 808, whether the concentration h belongs to the second preset concentration interval H1, if yes, proceed to step 810, if no, proceed to step 812;

Step 810, adjusting the output value P of the gas valve = the output value P of the gas valve - the preset offset dP;

Step 812, adjusting the output value P of the gas valve = the output value P of the gas valve + the preset offset dP;

Step 814, whether the output value of the gas valve is greater than the upper limit of the output value or less than the lower limit of the output value, if so, proceed to step 816, if not, proceed to step 802;

Step 816, the gas water heater stops running and/or alarms.

As shown in FIG10 , the gas water heater includes a processor 710, a water temperature detection device 720, a water flow detection device 722, and a carbon monoxide detection device 704, wherein the processor 710 includes a system control unit 7102 and a gas control unit 7104. Further, as shown in FIG8 , the best installation position of the carbon monoxide detection device (not shown in the figure) is between the heat exchanger 716 and the outlet of the smoke exhaust device 714, that is, in the smoke hood 7142 or the smoke exhaust channel 7144.

Specifically, the output value of the gas valve is adjusted by detecting the carbon monoxide concentration h to ensure good combustion conditions during the combustion operation of the water heater, thereby ensuring the safety of the equipment and users and improving safety and usability.

As shown in FIG11 , the correspondence between the gas valve control output value P required for the hot water production rate is verified in advance by testing, and the correspondence is designed and implanted into the system control unit.

When the water heater is burning gas and running, the carbon monoxide concentration h is first detected, and the corresponding range of the carbon monoxide concentration h is calculated according to FIG. 12 .

h=H2 (first preset concentration interval): the combustion operation is in good condition and continues to operate.

h=H1 (less than the minimum value h1 of the first preset concentration interval): adjust P=P-dP to maintain the combustion operation in a good state.

h=H3 (greater than the maximum value h2 of the first preset concentration interval): adjust P=P+dP to maintain the combustion operation in a good state.

When P>P_max (the upper limit of the gas valve output value) or P<P_min (the lower limit of the gas valve output value), the gas valve output value P exceeds the threshold value allowing the gas valve output value to be adjusted, and the water heater stops running and/or alarms.

In this embodiment, the water heater is controlled by the above control method, which can solve the problems of incomplete combustion, vibration combustion, etc. caused by poor ventilation environment, deviation of gas calorific value, backflow of exhaust pipe, etc.

Embodiment 12:

According to an embodiment of the third aspect of the present invention, a readable storage medium is proposed, on which a program or instruction is stored. When the program or instruction is executed by a processor, a control method for a gas water heater as in any of the above-mentioned embodiments is implemented, thereby having all the beneficial technical effects of the control method for a gas water heater as in any of the above-mentioned embodiments.

The readable storage medium includes a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is 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 between the steps after understanding the spirit of the present invention.

It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention 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 a different order from the embodiments, or several steps can be performed simultaneously.

In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to 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.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (12)

1. A control method of a gas water heater, characterized in that the gas water heater comprises a burner, a gas valve and a carbon monoxide detection device, the gas valve is used for controlling the gas inflow of the burner, and the control method of the gas water heater comprises the following steps:

Acquiring the concentration of carbon monoxide generated by the burner;

controlling the output value of the gas valve according to the carbon monoxide concentration;

The controlling the output value of the gas valve according to the carbon monoxide concentration comprises the following steps: based on the carbon monoxide concentration exceeding a first preset concentration interval, adjusting the output value according to a preset offset;

Before the force output value is adjusted according to the preset offset, the method comprises the following steps:

Obtaining the hot water yield of the gas water heater;

determining the first preset concentration interval according to the hot water yield;

The obtaining of the hot water yield of the gas water heater comprises the following steps:

Acquiring the water outlet temperature, the water inlet temperature and the water flow rate of the gas water heater;

Calculating the outlet water temperature, the inlet water temperature and the water flow rate, and determining the hot water yield.

2. The control method of a gas water heater according to claim 1, wherein the adjusting the output value according to a preset offset includes:

and controlling the output value to rise according to a first preset offset based on the carbon monoxide concentration being greater than or equal to a first concentration threshold.

3. The control method of a gas water heater according to claim 2, wherein the adjusting the output value according to a preset offset includes:

controlling the output value to be reduced according to a second preset offset based on the carbon monoxide concentration being less than or equal to a second concentration threshold;

Wherein the first concentration threshold is greater than the second concentration threshold.

4. A control method of a gas water heater according to claim 3, wherein,

The larger the first concentration threshold value is, the larger the first preset offset amount is;

the smaller the second concentration threshold, the larger the second preset offset.

5. The control method of a gas water heater according to any one of claims 1 to 4, further comprising:

and controlling the gas water heater to be turned off and/or outputting alarm information based on the output value exceeding the preset output value range.

6. The control method of a gas water heater according to any one of claims 1 to 4, further comprising:

and controlling the gas water heater to be closed and/or outputting alarm information based on the fact that the carbon monoxide concentration exceeds a second preset concentration interval.

7. The control method of a gas water heater according to any one of claims 1 to 4, further comprising a fan, before or after controlling an output value of the gas valve according to the carbon monoxide concentration, comprising:

and adjusting the duty ratio of the fan according to the carbon monoxide concentration.

8. A gas water heater, comprising:

A housing;

The burner is arranged in the shell;

The gas valve is connected with the burner and is used for controlling the gas inflow of the gas water heater;

the carbon monoxide detection device is used for acquiring the concentration of carbon monoxide generated by the burner;

A memory storing a program or instructions;

A processor connected to the memory, the carbon monoxide detection device and the gas valve, wherein the processor executes the program or instructions to implement the steps of the control method of the gas water heater according to any one of claims 1 to 7.

9. The gas water heater as recited in claim 8, further comprising:

the heat exchanger is arranged in the shell and comprises a water inlet and a water outlet;

the smoke exhaust device is arranged in the shell and is used for collecting and exhausting smoke generated by the burner;

the carbon monoxide detection device is located between the burner and the outlet of the fume extractor.

10. The gas water heater as recited in claim 9, further comprising:

The water temperature detection device is connected with the processor and is positioned at the water inlet and the water outlet, and the water temperature detection device is used for detecting the water inlet temperature and the water outlet temperature of the gas water heater;

and the water flow detection device is connected with the processor and is used for detecting the water flow rate of the gas water heater.

11. The gas water heater as recited in claim 9, further comprising:

and the fan is connected with the processor and is used for conveying air to the burner.

12. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, performs the steps of the control method of a gas water heater as claimed in any one of claims 1 to 7.