Gas water heater control method, device, system and gas water heater

Abstract

The present application relates to a control method, device, system and gas water heater for a gas water heater. A pressure sensor is provided at the gas proportional valve of the gas water heater to collect the gas pressure detection value in real time. At the same time, an oxygen content detector is provided inside the housing of the gas water heater to collect the oxygen content detection value in real time. The controller adjusts according to the corresponding preset pressure threshold range and the preset theoretical oxygen content value. Through the above solution, the precise control of the ratio of oxygen (or air) to gas used for combustion is realized, the problem of low heat exchange efficiency of the gas water heater is solved from the source, the applicability of the gas water heater is ensured, and thus the use reliability of the gas water heater is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of household electrical appliances, and particularly to a control method, device, system and gas water heater for a gas water heater. Background Art

[0002] With the development of social economy and the call of national energy conservation and emission reduction policies, the energy consumption and applicability of household electrical appliances during use have attracted more and more attention from consumers. In the case of water heaters, due to the advantages of good energy conservation and stable outlet water temperature of gas water heaters, they have been deeply loved by the majority of users in recent years, and their market position has been rising year by year. Users' requirements for the energy consumption, applicability and experience of gas water heaters are increasing day by day.

[0003] In order to meet the user requirements, various experts and scholars have put forward many improvement methods. For example: using condensation technology to recover and utilize the latent heat of the high-temperature flue gas generated by combustion, so as to increase the temperature of the cold water entering the water heater, thereby improving the heat exchange efficiency. However, this method will increase the amount of acidic condensate generated during the operation of the gas water heater, and over time, it will gradually reduce the working performance of the heat exchange components and greatly increase the energy consumption. In addition, there are many improvement methods such as changing the heat exchanger material, insulating the combustion chamber, and designing convex bumps on the fins. However, in actual use, there are certain limitations. When affected by the environment, such as too much moisture content in the air, uneven mixing of air and gas, insufficient gas pressure, and low oxygen content in the air, the heat exchange efficiency will still be greatly reduced, and the applicability of the machine is severely limited. Therefore, the existing gas water heaters have the disadvantage of poor use reliability. Summary of the Invention

[0004] Based on this, in view of the problem of poor use reliability of existing gas water heaters, it is necessary to provide a control method, device, system and gas water heater for a gas water heater.

[0005] A control method for a gas water heater includes: obtaining a gas pressure detection value and an oxygen content detection value, where the gas pressure detection value is collected and fed back in real time by a pressure sensor disposed at a gas proportional valve of the gas water heater, and the oxygen content detection value is collected and fed back in real time by an oxygen content detector disposed inside the housing of the gas water heater; adjusting a bypass pipeline of the gas water heater according to the gas pressure detection value and a preset pressure threshold range so that the gas pressure detection value meets the preset pressure threshold range; when the oxygen content detection value does not meet the preset oxygen content threshold range, adjusting the rotation speed of a supercharging air pump of the gas water heater according to the oxygen content detection value and a preset theoretical oxygen content value.

[0006] In one embodiment, the gas water heater control method further includes: when the gas water heater is turned on, performing a self-check in real time according to the state parameter value of the gas water heater, the state parameter value is collected and fed back by the state parameter collection device of the gas water heater.

[0007] In one embodiment, the self-checking is performed based on the status parameter value of the gas water heater, including: determining whether the status parameter of the gas water heater satisfies the corresponding preset fluctuation range; when the status parameter satisfies the corresponding preset fluctuation range, obtaining the heat exchange efficiency of the gas water heater based on the status parameter; when the heat exchange efficiency is less than a preset heat exchange efficiency threshold, outputting a fault prompt message.

[0008] In one embodiment, after the step of determining whether the state parameter of the gas water heater satisfies the corresponding preset fluctuation range, it also includes: when the state parameter does not satisfy the corresponding preset fluctuation range, automatically adjusting according to the set water outlet temperature so that the state parameter satisfies the corresponding preset fluctuation range.

[0009] In one embodiment, the state parameter includes a gas calorific value, and the self-checking based on the state parameter value of the gas water heater includes: determining whether the absolute value of the difference between the gas calorific value and the minimum value of a preset gas calorific value threshold range is less than or equal to a preset error value, or whether the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is less than or equal to a preset error value; when the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is less than or equal to the preset error value, or the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is less than or equal to the preset error value, adjusting the gas flow rate so that the gas calorific value meets the preset gas calorific value threshold range.

[0010] In one embodiment, after the step of determining whether the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is less than or equal to the preset error value, or whether the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is less than or equal to the preset error value, the step further includes: when the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is greater than the preset error value, or the absolute value of the difference between the gas calorific value and the maximum value of the gas calorific value content threshold range is greater than the preset error value, outputting a combustion parameter mismatch prompt message.

[0011] In one embodiment, the step of adjusting the bypass pipeline of the gas water heater according to the gas pressure detection value and the preset pressure threshold range to make the gas pressure detection value meet the preset pressure threshold range includes: when the gas pressure detection value is less than or equal to the minimum value of the preset pressure threshold range, controlling the solenoid valve of the bypass pipeline of the gas water heater to open, and controlling the booster pump of the bypass pipeline of the gas water heater to operate according to the rotation speed corresponding to the difference between the gas pressure detection value and the minimum value; when the gas pressure detection value is greater than the maximum value of the preset pressure threshold range, increasing the start-up times of the booster pump by one for counting; when the start-up times of the booster pump are greater than the preset start-up times, controlling the booster pump to start and operate until the water use ends.

[0012] In one embodiment, after the step of increasing the start-up times of the booster pump by one for counting when the gas pressure detection value is greater than the maximum value of the preset pressure threshold range, it further includes: when the start-up times of the booster pump are less than or equal to the preset start-up times, controlling the booster pump to close.

[0013] In one embodiment, the fan speed of the gas water heater remains unchanged.

[0014] A gas water heater control device includes: a detection value acquisition module for acquiring a gas pressure detection value and an oxygen content detection value, where the gas pressure detection value is collected and fed back in real time by a pressure sensor disposed at the gas proportional valve of the gas water heater, and the oxygen content detection value is collected and fed back in real time by an oxygen content detector disposed inside the housing of the gas water heater; a gas pressure adjustment module for adjusting the bypass pipeline of the gas water heater according to the gas pressure detection value and the preset pressure threshold range to make the gas pressure detection value meet the preset pressure threshold range; an air adjustment module for adjusting the rotation speed of the booster air pump of the gas water heater according to the oxygen content detection value and the preset oxygen content theoretical value when the oxygen content detection value does not meet the preset oxygen content threshold range.

[0015] A gas water heater control system includes a pressure sensor, an oxygen content detector, a bypass pipeline, a booster air pump, and a controller. The pressure sensor, the oxygen content detector, the bypass pipeline, and the booster air pump are respectively connected to the controller. The pressure sensor is disposed at the gas proportional valve of the gas water heater, the oxygen content detector is disposed inside the housing of the gas water heater, the bypass pipeline is disposed in the gas transmission pipeline of the gas water heater, the booster air pump is disposed in the air transmission pipeline of the gas water heater. The pressure sensor is used to collect the gas pressure detection value in real time and feed it back to the controller, the oxygen content detector is used to collect the oxygen content detection value in real time and feed it back to the controller, and the controller is used to perform combustion control according to the above method.

[0016] In one embodiment, the gas water heater control system further includes a state parameter acquisition device, and the state parameter acquisition device is connected to the controller.

[0017] In one embodiment, the state parameter acquisition device includes at least one of a gas phase mass spectrometer, a water flow sensor, and a temperature sensor.

[0018] In one embodiment, the bypass pipeline includes a pipeline, a solenoid valve, and a booster pump. The solenoid valve and the booster pump are respectively arranged on the pipeline. The solenoid valve and the booster pump are respectively connected to the controller. One end of the pipeline is connected to the gas proportional valve of the gas water heater, and the other end of the pipeline is connected to the outlet end of the stop valve of the gas water heater.

[0019] A gas water heater includes the above-mentioned gas water heater control system.

[0020] In one embodiment, the gas water heater further includes an air dehumidifier, and the air dehumidifier is arranged on the air delivery pipeline of the gas water heater.

[0021] In one embodiment, the gas water heater further includes a flow disturbance device, and the flow disturbance device is arranged on the gas and air mixing pipe of the gas water heater.

[0022] In one embodiment, the smoke exhaust pipe of the gas water heater is a double-layer pipe. The inner pipe of the smoke exhaust pipe is used for exhausting smoke, and the outer pipe of the smoke exhaust pipe is used for delivering the air required for combustion.

[0023] In the above-mentioned gas water heater control method, device, system, and gas water heater, a pressure sensor is provided at the gas proportional valve of the gas water heater to collect the gas pressure detection value in real time. At the same time, an oxygen content detector is provided in the housing of the gas water heater to collect the oxygen content detection value in real time. The controller adjusts according to the corresponding preset pressure threshold range and the preset theoretical oxygen content value. Through the above solution, the precise control of the ratio of oxygen (or air) to gas used for combustion is realized, and the problem of low heat exchange efficiency of the gas water heater is solved from the source, ensuring the applicability of the gas water heater, thereby effectively improving the use reliability of the gas water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1Schematic diagram of the control method for a gas water heater in an embodiment;

[0026] Figure 2 Schematic diagram of the structure of a gas water heater in an embodiment;

[0027] Figure 3 Schematic diagram of the control method for a gas water heater in another embodiment;

[0028] Figure 4 Schematic diagram of the self - inspection process in an embodiment;

[0029] Figure 5 Flow chart of the self - inspection process in an embodiment;

[0030] Figure 6 Schematic diagram of the self - inspection process in another embodiment;

[0031] Figure 7 Schematic diagram of the self - inspection process in yet another embodiment;

[0032] Figure 8 Schematic diagram of the self - inspection process in still another embodiment;

[0033] Figure 9 Schematic diagram of the gas pressure regulation process in an embodiment;

[0034] Figure 10 Flow chart of the gas pressure regulation method in an embodiment;

[0035] Figure 11 Schematic diagram of the gas pressure regulation process in another embodiment;

[0036] Figure 12 Schematic diagram of the structure of the control device for a gas water heater in an embodiment;

[0037] Figure 13 Schematic diagram of the structure of the control device for a gas water heater in another embodiment;

[0038] Figure 14 Schematic diagram of the structure of the flow - disturbing device in an embodiment.

[0039] Reference numerals: 1 - blower, 2 - controller, 3 - heat exchanger, 4 - oxygen content detector, 5 - pressure sensor, 6 and 13 - temperature sensors, 7 - water flow sensor, 8 - gas proportional valve, 9 - booster pump, 11 - supercharger air pump, 10 - solenoid valve, 12 - air dehumidifier, 14 - exhaust pipe, 15 - air inlet, 16 - air delivery pipe, 17 - hot water outlet pipe, 18 - gas delivery pipe, 19 - cold water pipe, 20 - stop valve, 21 - gas chromatography - mass spectrometry monitor, 30 - flow - disturbing device, 40 - bypass pipeline, 41 - pipeline. Detailed implementation manners

[0040] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0041] Please refer to Figure 1 , a gas water heater control method, including step S100, step S200, and step S300.

[0042] Step S100, obtaining a gas pressure detection value and an oxygen content detection value.

[0043] Specifically, the gas pressure detection value is collected and fed back in real time by a pressure sensor disposed at a gas proportional valve of the gas water heater, and the oxygen content detection value is collected and fed back in real time by an oxygen content detector disposed inside the housing of the gas water heater. The gas proportional valve is a valve for realizing the adjustment of the gas-air ratio. Please refer to Figure 2 , the gas proportional valve 8 is disposed on the gas transmission pipeline, and the pressure sensor 5 is disposed at the gas proportional valve 8. Specifically, it can be disposed at the outlet end of the gas proportional valve 8 as shown in Figure 2 to detect the magnitude of the secondary gas pressure, that is, the pressure after part of the pressure is consumed when the gas passes through the gas proportional valve. Compared with the pressure detected at the inlet end of the gas proportional valve 8, the obtained gas pressure detection value is more accurate. The amount of oxygen in the air will directly affect the combustion efficiency of the gas. Therefore, in this embodiment, an oxygen content detector 4 is disposed inside the housing of the gas water heater to perform the detection operation of the oxygen content in the air in real time.

[0044] It should be noted that the manner in which the controller obtains the gas pressure detection value and the oxygen content detection value is not unique. It can be obtained by the controller accessing the pressure sensor 5 and the oxygen content detector 4 in real time, or the pressure sensor 5 and the oxygen content detector 4 can actively send the collected data to the controller.

[0045] Step S200, adjusting the bypass pipeline of the gas water heater according to the gas pressure detection value and a preset pressure threshold range so that the gas pressure detection value satisfies the preset pressure threshold range.

[0046] Specifically, the preset pressure threshold range represents the gas pressure range required for the gas water heater to operate at high efficiency. This embodiment incorporates a bypass pipe into the gas transmission pipeline. A pressure sensor at the gas proportional valve monitors the gas pressure required for combustion in real time, obtains a gas pressure detection value, and feeds the result back to the controller. The controller is pre-set with a preset pressure threshold range. When the controller receives a gas pressure detection value, it adjusts the bypass pipe differently based on the relationship between the gas pressure detection value and the preset gas pressure threshold range, ensuring that the final collected gas pressure detection value is within the preset pressure threshold range, i.e., satisfies the preset pressure threshold range.

[0047] It should be noted that the specific type of the bypass line is not limited, as long as it can achieve the regulation of gas pressure. For example, in one embodiment, please refer to Figure 2 The bypass pipeline includes a pipeline, a solenoid valve and a booster pump. The solenoid valve and the booster pump are respectively arranged on the pipeline. The solenoid valve and the booster pump are respectively connected to the controller. One end of the pipeline is connected to the gas proportional valve of the gas water heater, and the other end of the pipeline is connected to the stop valve outlet of the gas water heater.

[0048] Step S300: When the oxygen content detection value does not meet the preset oxygen content threshold range, the speed of the booster pump of the gas water heater is adjusted according to the oxygen content detection value and the preset oxygen content theoretical value.

[0049] Specifically, the oxygen content detected value does not meet the preset oxygen content threshold range, that is, the oxygen content detected value is less than the minimum value of the preset oxygen content threshold range, or the oxygen content detected value is greater than the maximum value of the preset oxygen content threshold range. The booster air pump is installed in the air delivery pipeline, and by adjusting the booster air pump, the amount of air delivered to the gas water heater for combustion (i.e., the oxygen content) can be adjusted.

[0050] Furthermore, in one embodiment, a dehumidifier is provided on the air delivery duct to dehumidify the air delivered to the gas water heater, reducing moisture in the air and facilitating combustion of the gas-air mixture. Furthermore, in one embodiment, a flow turbulence device is provided on the gas-air mixing pipe of the gas water heater to transform the mixed gas (i.e., the gas-air mixture) from laminar flow to turbulent flow, thereby achieving more complete mixing of the gas and air, more favorable combustion, and higher heat exchange efficiency.

[0051] It should be pointed out that, in one embodiment, the controller adjusts the booster air pump of the gas water heater according to the oxygen content detection value on the basis that the gas pressure detection value satisfies the preset gas pressure threshold range. That is to say, when the controller adjusts the bypass pipeline according to the gas pressure detection value, the adjustment will only be completed when the gas pressure detection value satisfies the preset pressure threshold range, otherwise the gas pressure adjustment operation will continue.

[0052] Furthermore, in one embodiment, after the controller obtains the oxygen content detection value, if the oxygen content detection value satisfies a preset oxygen content threshold range, i.e., if the oxygen content detection value is within the preset oxygen content threshold range, the controller does not need to perform further analysis or adjust the booster pump, and only needs to maintain the current state, i.e., complete the automatic air adjustment operation. Similarly, when the controller adjusts the oxygen content detection value by adjusting the speed of the booster pump, if the oxygen content detection value satisfies the preset oxygen content threshold range, the controller will stop adjusting the booster pump.

[0053] It is understood that the present application utilizes the difference between the measured oxygen content value and the preset theoretical oxygen content value to adjust the booster pump. This is primarily to allow for a margin to prevent the booster pump from frequently starting up, which could affect its performance and lifespan and cause a certain amount of noise. Furthermore, in one embodiment, the controller sets the preset oxygen content threshold range to between the preset theoretical oxygen content value - the error value and the preset theoretical oxygen content value + the error value, primarily to account for errors in the booster pump and other components. Furthermore, the error value is generally 5% of the preset theoretical oxygen content value.

[0054] See also Figure 3 In one embodiment, the gas water heater control method further includes step S400.

[0055] Step S400: When the gas water heater is turned on, a self-check is performed in real time according to the state parameter values of the gas water heater.

[0056] Specifically, the state parameter values are collected and fed back by the gas water heater's state parameter collection device. Self-testing involves testing the gas water heater's own operating status, specifically the operating state of the gas water heater. During actual operation, a gas water heater can experience an almost exponential decrease in heat exchange efficiency over time due to environmental influences, residual carbon deposits on the heat exchanger, condensate corrosion residues, and other factors. This results in increased energy consumption and a worsening water experience for users. This embodiment provides a control method capable of self-testing the operation of a gas water heater. This approach allows for immediate monitoring of the gas water heater's operating status, enabling timely response when the operating status is abnormal. It is understood that the controller's self-test, based on the state parameters collected by the state parameter collection device, begins when the gas water heater is turned on. Upon startup, the controller immediately performs a self-test. During subsequent operation, the controller periodically acquires state parameters for self-testing in real time at regular intervals to ensure the gas water heater operates with optimal state parameters.

[0057] It should be noted that the type and location of the state parameter acquisition device are not limited. For example, in one embodiment, the state parameter acquisition device includes at least one of a gas phase mass spectrometer, a water flow sensor, and a temperature sensor. Accordingly, the gas phase mass spectrometer is located in the gas transmission pipeline, the water flow sensor is located in the cold water pipeline, and the temperature sensor is located in the cold water pipeline and / or the hot water outlet pipeline. Each device is connected to a controller and feeds the collected data back to the controller in real time for analysis and processing.

[0058] See also Figure 4 In one embodiment, a self-check is performed according to the state parameter value of the gas water heater, including step S410, step S420 and step S430.

[0059] Step S410, determine whether the state parameters of the gas water heater meet the corresponding preset fluctuation range; step S420, when the state parameters meet the corresponding preset fluctuation range, obtain the heat exchange efficiency of the gas water heater according to the state parameters; step S430, when the heat exchange efficiency is less than the preset heat exchange efficiency threshold, output a fault prompt message.

[0060] Specifically, the preset fluctuation range is a range value obtained by appropriately increasing or decreasing a certain value on the basis of the theoretical value. Meeting the preset fluctuation range means that the state parameter is between the minimum and maximum values of the corresponding preset fluctuation range. It can be understood that the type of the state parameter is not unique, and the corresponding preset fluctuation ranges are also different. After the controller obtains the state parameter, it only needs to compare and analyze it with the corresponding preset fluctuation range. When the state parameter meets the corresponding preset fluctuation range, the controller performs further analysis operations based on the state parameter to obtain the corresponding heat exchange efficiency of the gas water heater at this time, and when the heat exchange efficiency is less than the preset heat exchange efficiency threshold, the user is informed in a timely manner.

[0061] For example, in one embodiment, please refer to Figure 5 . The state parameters include gas calorific value, air volume, and gas volume. When the gas calorific value, air volume, and gas volume all meet the corresponding preset fluctuation ranges, the controller will only analyze the heat exchange efficiency based on each parameter, and then perform further analysis operations according to the heat exchange efficiency. It can be understood that if the heat exchange efficiency is greater than or equal to the preset heat exchange efficiency threshold, this self-check ends. If the self-check operation is performed when the gas water heater is turned on, after this self-check ends, the controller will execute operations to obtain the gas pressure detection value and oxygen content detection value for further analysis and start the next self-check operation; if the self-check operation is during the operation of the gas water heater, after this self-check ends, the controller will start the next self-check operation.

[0062] Please refer to Figure 6 . In one embodiment, after step S410, the method further includes step S440.

[0063] Step S440, when the state parameter does not meet the corresponding preset fluctuation range, automatically adjust according to the set outlet water temperature so that the state parameter meets the corresponding preset fluctuation range.

[0064] Specifically, please refer to Figure 5, when the controller analyzes whether the state parameters meet the corresponding preset fluctuation range, there will also be cases where the state parameters do not meet the corresponding preset fluctuation range. The controller will automatically adjust according to the set outlet water temperature of the gas water heater so that each state parameter reaches the corresponding preset fluctuation range, and then perform operations similar to those in the above embodiments to analyze the heat exchange efficiency of the gas water heater based on the state parameters. For example, in one embodiment, the state parameters include the gas volume and the air volume. When the gas volume does not meet the preset gas fluctuation range, the controller will automatically adjust the gas volume; when the air volume does not meet the air volume threshold range, the size of the air volume will be automatically adjusted. It can be understood that the specific gas volume adjustment method and air volume adjustment method are not unique and can be achieved by adjusting the solenoid valve opening of the gas delivery pipeline or the solenoid valve opening of the air delivery pipeline.

[0065] Furthermore, in one embodiment, the state parameter acquisition device includes a gas chromatography mass spectrometer, a water flow sensor, and a temperature sensor for explanation. First, the controller makes a hierarchical judgment on the calorific value of the gas source detected by the gas chromatography mass spectrometer. When the calorific value exceeds the specified range, the automatic adjustment system increases the gas flow to meet the water use requirements. If the calorific value of the gas source varies greatly, the machine will remind the user that the burner parameters do not match the gas source and the machine needs to be shut down. Subsequently, the gas volume and the air volume are judged and automatically adjusted according to the set outlet water temperature. Finally, the heat exchange efficiency calculated by the controller is compared with the parameter values of the gas water heater itself. The heat exchange efficiency calculation formula is:

[0066]

[0067] Among them, η t is the thermal efficiency when the hot water production temperature t=(tw2 - tw1), with the unit of K; C is the specific heat of water, 4.19×10 -3 MJ / (Kg.K); M is the hot water output, which can be set according to requirements when the user uses the gas water heater, or collected by setting a flow sensor in the hot water outlet pipe; the unit is Kg / min; t w2 is the hot water outlet temperature, collected by the temperature sensor set in the hot water outlet pipe, with the unit of °C; t w1 is the inlet water temperature, collected by the temperature sensor set in the cold water pipe; the unit is °C; Q1 is the measured low calorific value of the gas, collected by the gas chromatography mass spectrometer, with the unit of MJ / m 3 ; V is the measured gas flow, which can be collected by setting a flow meter in the gas pipeline, with the unit of m 3 / min; tg is the gas temperature inside the gas flowmeter, in °C; Pa is the atmospheric pressure, in KPa; Pg is the gas pressure inside the gas flowmeter, in KPa; S: the saturated vapor pressure corresponding to the gas temperature tg °C, in KPa. If the thermal efficiency is still less than the factory parameter value of the machine itself (a 5% - 10% error can be reserved on the theoretical basis, which is the corresponding preset heat exchange efficiency threshold), the controller will output that there is a fault in the heat exchanger and remind the user to stop the machine for maintenance.

[0068] Further, in one embodiment, the gas water heater is provided with a display device, and the display device is connected to the controller. The controller outputs the fault prompt information through the display device to inform the user.

[0069] Please refer to Figure 7 , in one embodiment, the state parameter includes the gas calorific value. Self-checking is performed according to the state parameter value of the gas water heater, including step S450 and step S460.

[0070] Step S450, determine whether the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is less than or equal to the preset error value, or whether the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is less than or equal to the preset error value; Step S460, when the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is less than or equal to the preset error value, or the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is less than or equal to the preset error value, adjust the gas flow to make the gas calorific value meet the preset gas calorific value threshold range.

[0071] Specifically, please refer to Figure 5 , after the state parameter acquisition device acquires the gas calorific value and feeds it back to the controller, the controller will compare and analyze the received gas calorific value with the preset gas calorific value threshold range. Specifically, the controller analyzes the difference by subtracting the gas calorific value from the maximum value and the minimum value in the preset gas calorific value threshold range respectively, and determines whether the difference exceeds the preset error value, that is, when the gas calorific value is less than the minimum value of the preset gas calorific value threshold range or greater than the maximum value of the preset gas calorific value threshold range, detect the deviation degree of the gas calorific value from the preset gas calorific value threshold range. If the deviation degree of the gas calorific value from the preset gas calorific value threshold range is small, the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is less than or equal to the preset error value, or the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is less than or equal to the preset error value, at this time the controller will adjust and increase the gas flow to make the gas calorific value meet the preset gas calorific value threshold range.

[0072] Please refer to Figure 8, in one embodiment, after step S450, the method further includes step S470.

[0073] Step S470, when the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is greater than the preset error value, or the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is greater than the preset error value, output a prompt message indicating that the combustion parameters do not match.

[0074] Specifically, please refer to Figure 5 , if the gap between the gas calorific value and the preset gas calorific value threshold range is large, that is, when the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is less than or equal to the preset error value, or the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is less than or equal to the preset error value, the controller will directly output a prompt message indicating that the combustion parameters do not match to remind the user to stop the machine and replace the corresponding device.

[0075] It should be noted that, in one embodiment, the state parameter acquisition device includes a gas phase mass spectrometer, and the gas phase mass spectrometer is arranged on the gas transmission pipeline and is communicatively connected to the controller to realize the acquisition and feedback operation of the gas calorific value. It can be understood that the way for the controller to adjust and increase the gas flow is not the only one, and specifically, it can be realized by adjusting the opening degree of the solenoid valve of the gas transmission pipeline, etc.

[0076] Please refer to Figure 9 , in one embodiment, step S200 includes step S210, step S220 and step S230. Step S210, when the detected gas pressure value is less than or equal to the minimum value of the preset pressure threshold range, control the solenoid valve of the bypass pipeline of the gas water heater to open, and control the booster pump of the bypass pipeline of the gas water heater to operate according to the rotation speed corresponding to the difference between the detected gas pressure value and the minimum value. Step S220, when the detected gas pressure value is greater than the maximum value of the preset pressure threshold range, increase the start count of the booster pump by one. Step S230, when the start count of the booster pump is greater than the preset start count, control the booster pump to start and operate until the water use ends.

[0077] Specifically, gas water heaters powered by natural gas operate at a pressure of 2000 Pa (approximately 2000 Pa) and can operate between 1000 and 3000 Pa. In some areas, due to incomplete municipal gas pipeline networks or peak gas usage, the gas pressure cannot meet operating requirements. This results in poor combustion, reduced heat exchange efficiency, increased energy consumption, and a significantly reduced user experience. Furthermore, current gas water heaters tend to offer a variety of functions. For example, they offer features like elderly baths and children's baths to meet the varying water requirements of different age groups, requiring different gas pressures. Therefore, during actual use, the water heater may operate normally in certain modes, but experience a significant decrease in heat exchange efficiency when switched to a higher power mode.

[0078] Therefore, in this embodiment, please refer to Figure 10 A bypass line is formed by installing a solenoid valve and a booster pump on the gas transmission pipeline. A pressure sensor in front of the gas proportional valve monitors the gas pressure required for combustion in real time and feeds the result to the controller. When the detected gas pressure value is within the preset pressure range, the solenoid valve is normally closed and the booster pump is inoperative, allowing gas to mix directly with air through the gas proportional valve. If the controller detects that the gas pressure value exceeds the preset threshold range (i.e., P-P1 to P+P1), it makes a further determination. First, if the detected gas pressure value P-P1 ≤ P-P1, the main controller responds by opening the solenoid valve in the bypass line and starting the booster pump at the speed corresponding to the difference between P-P1 and P+P1, thus achieving automatic boosting. While the booster pump is on, the pressure sensor monitors the gas pressure in real time. If P-P1 is between P-P1 and P+P1, the same operation as when P-P1 ≤ P-P1 is performed, controlling the booster pump at the speed corresponding to the difference between P-P1 and P+P1. If the continuous boosting makes the gas pressure detection value P greater than P+P1, the controller performs the corresponding logical operation (that is, the number of starts of the booster pump is increased by 1, recorded as i=i+1), and then the controller determines whether i is less than or equal to the preset number of starts. If the number of starts of the booster pump is greater than the preset number of starts, the controller controls the solenoid valve and the booster pump to be normally open until the water use ends.

[0079] In this embodiment, without affecting the heat exchange efficiency of the gas water heater during operation, P-P1 and P+P1 are set as the limit values for opening and closing the solenoid valve and the booster pump on the bypass pipeline of the gas transmission pipeline. At the same time, the controller adds the cumulative calculation of the number of times the booster pump is started. This is mainly to solve the problem of frequent starting of the booster pump and the solenoid valve causing a decrease in user experience and a shortened life of the gas water heater.

[0080] See also Figure 11, in one embodiment, after step S220, the method further includes step S240.

[0081] Step S240, when the start-up times of the booster pump are less than or equal to the preset start-up times, control the booster pump to shut down.

[0082] Specifically, please refer to Figure 10 , when the controller calculates the cumulative start-up times of the booster pump according to the detected value of the gas pressure and the maximum value of the preset pressure threshold range, there will also be a situation where the cumulative times are less than or equal to the preset start-up times. At this time, the controller will directly control the booster pump to shut down and stop the boosting operation of the gas pressure. It can be understood that the size of the preset start-up times is not unique. For example, in one embodiment, the preset start-up times are 5 times. Further, in one embodiment, when the controller controls the booster pump to shut down, it also controls the solenoid valve on the bypass pipeline to shut down to avoid the problem of frequent start-up of the booster pump and the solenoid valve.

[0083] In one embodiment, the fan speed of the gas water heater remains unchanged.

[0084] Specifically, when the controller automatically adjusts the air according to the detected value of the oxygen content and the preset oxygen content threshold range, the fan speed of the water heater remains unchanged throughout the process and always rotates according to the minimum water use power requirement. The fan speed is set according to the minimum working power of the gas water heater in the entire control process of the air automatic adjustment, mainly to enhance the heat exchange efficiency. The residence time of the high-temperature flue gas generated by combustion and the level of the dew point temperature are the main factors affecting the heat exchange efficiency. According to the control method in the present application, when the water heater works at the minimum power, the booster air pump does not start, and the primary air power is provided by the fan; when working at a higher power, the booster air pump starts and provides power together with the fan. As the required combustion power becomes larger, the amount of high-temperature flue gas staying in the combustion chamber will become more and more, and the residence time will become longer than before. The volume of the combustion chamber remains unchanged, and the dew point temperature of the high-temperature flue gas will increase accordingly. The heat absorbed by the convective heat exchange from the flue gas increases, and the heat exchange efficiency will also increase significantly compared with before.

[0085] In the above gas water heater control method, a pressure sensor is provided at the gas proportional valve of the gas water heater to collect the detected value of the gas pressure in real time, and an oxygen content detector is provided inside the housing of the gas water heater to collect the detected value of the oxygen content in real time. The controller adjusts according to the corresponding preset pressure threshold range and the preset oxygen content theoretical value. Through the above solution, the precise control of the ratio of oxygen (or air) to gas used for combustion is realized, and the problem of low heat exchange efficiency of the gas water heater is solved from the source, ensuring the applicability of the gas water heater, and thus effectively improving the use reliability of the gas water heater.

[0086] Please refer to Figure 12, a gas water heater control device, including a detection value acquisition module 100, a gas pressure regulation module 200, and an air regulation module 300.

[0087] Specifically, the detection value acquisition module 100 is used to acquire the gas pressure detection value and the oxygen content detection value. The gas pressure regulation module 200 is used to adjust the bypass pipeline of the gas water heater according to the gas pressure detection value and the preset pressure threshold range, so that the gas pressure detection value meets the preset pressure threshold range; the air regulation module 300 is used to adjust the rotation speed of the booster air pump of the gas water heater according to the oxygen content detection value and the preset theoretical oxygen content value when the oxygen content detection value does not meet the preset oxygen content threshold range.

[0088] In one embodiment, please refer to Figure 13 , the gas water heater control device further includes a self-check module 400. The self-check module 400 is used to perform self-check in real time according to the state parameter values of the gas water heater when the gas water heater is turned on and running.

[0089] In one embodiment, the self-check module 400 is further used to determine whether the state parameters of the gas water heater meet the corresponding preset fluctuation range; when the state parameters meet the corresponding preset fluctuation range, obtain the heat exchange efficiency of the gas water heater according to the state parameters; when the heat exchange efficiency is less than the preset heat exchange efficiency threshold, output a fault prompt message.

[0090] In one embodiment, the self-check module 400 is further used to perform automatic adjustment according to the set outlet water temperature when the state parameters do not meet the corresponding preset fluctuation range, so that the state parameters meet the corresponding preset fluctuation range.

[0091] In one embodiment, the self-check module 400 is further used to determine whether the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is less than or equal to the preset error value, or whether the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is less than or equal to the preset error value; when the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is less than or equal to the preset error value, or the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is less than or equal to the preset error value, adjust the gas flow rate so that the gas calorific value meets the preset gas calorific value threshold range.

[0092] In one embodiment, the self-check module 400 is further used to output a combustion parameter mismatch prompt message when the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is greater than the preset error value, or the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is greater than the preset error value.

[0093] In one embodiment, the gas pressure regulation module 200 is further configured to control the solenoid valve of the bypass pipeline of the gas water heater to open when the detected gas pressure value is less than or equal to the minimum value of the preset pressure threshold range, and control the booster pump of the bypass pipeline of the gas water heater to operate at a rotational speed corresponding to the difference between the detected gas pressure value and the minimum value; when the detected gas pressure value is greater than the maximum value of the preset pressure threshold range, the start count of the booster pump is incremented by one; when the start count of the booster pump is greater than the preset start count, control the booster pump to start and operate until the water usage ends.

[0094] In one embodiment, the gas pressure regulation module 200 is further configured to control the booster pump to close when the start count of the booster pump is less than or equal to the preset start count.

[0095] For the specific limitations of the gas water heater control device, reference can be made to the limitations of the gas water heater control method in the foregoing text, which will not be elaborated here. Each module in the above gas water heater control device can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in the processor of the computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above respective modules.

[0096] In the above gas water heater control device, a pressure sensor is provided at the gas proportional valve of the gas water heater to collect the detected gas pressure value in real time, and an oxygen content detector is provided inside the housing of the gas water heater to collect the detected oxygen content value in real time. The controller adjusts according to the corresponding preset pressure threshold range and the preset theoretical oxygen content value. Through the above solution, precise control of the ratio of oxygen (or air) to gas used for combustion is achieved, solving the problem of low heat exchange efficiency of the gas water heater from the source, ensuring the applicability of the gas water heater, and thus effectively improving the use reliability of the gas water heater.

[0097] Please refer to Figure 2 , a gas water heater control system, including a pressure sensor 5, an oxygen content detector 4, a bypass pipeline 40, a booster air pump 11, and a controller 2. The pressure sensor 5, the oxygen content detector 4, the bypass pipeline 40, and the booster air pump 11 are respectively connected to the controller 2 (not shown in the figure). The pressure sensor 5 is provided at the gas proportional valve 8 of the gas water heater. The oxygen content detector 4 is provided inside the housing of the gas water heater. The bypass pipeline 40 is provided in the gas transmission pipeline 18 of the gas water heater. The booster air pump 11 is provided in the air transmission pipeline 16 of the gas water heater. The pressure sensor 5 is used to collect the detected gas pressure value in real time and feedback it to the controller 2. The oxygen content detector 4 is used to collect the detected oxygen content value in real time and feedback it to the controller 2. The controller 2 is used to perform combustion control according to the above method.

[0098] Specifically, the detected gas pressure value is collected and fed back in real time by the pressure sensor 5 disposed at the gas proportional valve 8 of the gas water heater, and the detected oxygen content value is collected and fed back in real time by the oxygen content detector 4 disposed inside the housing of the gas water heater. The gas proportional valve 8 is a valve for adjusting the ratio of gas and air. Please refer to Figure 2 , the gas proportional valve 8 is disposed on the gas-air mixing pipeline, that is, the pipeline through which the air conveyed by the air conveying pipeline 16 is mixed with the gas conveyed by the gas pipeline and then transmitted. The pressure sensor 5 disposed at the gas proportional valve 8 may specifically be disposed at the outlet end of the gas proportional valve 8, or may be disposed at the inlet end of the gas proportional valve 8, as long as the detected gas pressure value can be reasonably obtained. The amount of oxygen in the air will directly affect the combustion efficiency of the gas. Therefore, in this embodiment, an oxygen content detector 4 is disposed inside the housing to detect the oxygen content in the air in real time.

[0099] The preset pressure threshold range is the range value of the gas pressure required for the gas water heater to operate efficiently. In this embodiment, a bypass pipeline is disposed on the gas conveying pipeline 18, and the pressure sensor 5 at the gas proportional valve 8 monitors the gas pressure required for combustion in real time, obtains the detected gas pressure value and feeds the result back to the controller 2. A preset pressure threshold range is preset in the controller 2. When the controller 2 receives the detected gas pressure value, it will adjust the bypass pipeline 40 differently according to the relationship between the detected gas pressure value and the preset gas pressure threshold range, so that the finally collected detected gas pressure value is within the preset pressure threshold range, that is, the preset pressure threshold range is satisfied.

[0100] The detected oxygen content value does not satisfy the preset oxygen content threshold range, that is, the detected oxygen content value is less than the minimum value of the preset oxygen content threshold range, or the detected oxygen content value is greater than the maximum value of the preset oxygen content threshold range. The booster air pump 11 is disposed on the air conveying pipeline 16. By adjusting the booster air pump 11, the amount of air (i.e., oxygen content) conveyed to the gas water heater for combustion can be adjusted.

[0101] In one embodiment, the gas water heater control system further includes a state parameter acquisition device, and the state parameter acquisition device is connected to the controller 2.

[0102] The status parameter values are collected and fed back by the status parameter acquisition device of the gas water heater. Self-check means detecting its own operating conditions, that is, detecting the operating status of the gas water heater. In the actual working process of the gas water heater, due to the influence of the external environment or the residual carbon deposits on the heat exchanger, condensate corrosion residues, etc., the heat exchange efficiency almost decreases exponentially over time. This makes the energy consumption gradually increase and the water use experience become worse and worse during the user's use process. This embodiment provides a control method capable of self-checking the operation of the gas water heater. Through the solution of this embodiment, the operating status of the gas water heater can be known in time, so as to make a timely response when the operating status is unreasonable. It can be understood that the self-check of the controller 2 based on the status parameters collected by the status parameter acquisition device starts with the startup of the gas water heater. When the gas water heater is turned on, a self-check operation will be immediately performed. During the subsequent operation, the controller 2 can obtain the status parameters in real time at a certain time interval for self-check to ensure that the gas water heater operates under the best status parameter conditions.

[0103] It should be noted that the type and installation position of the status parameter acquisition device are not unique. For example, in one embodiment, please refer to Figure 2 , the status parameter acquisition device includes at least one of a gas chromatography-mass spectrometry monitor 21, a water flow sensor 7, and a temperature sensor. Correspondingly, the gas chromatography-mass spectrometry monitor 21 is arranged on the gas delivery pipeline 18, the water flow sensor 7 is arranged on the cold water pipeline 19, and the temperature sensor is arranged on the cold water pipeline 19 and / or the hot water outlet pipeline 17, and each device is connected to the controller 2 to feed back the collected data to the controller 2 for analysis and processing in real time.

[0104] Please continue to refer to Figure 2 , in one embodiment, the bypass pipeline 40 includes a pipeline 41, a solenoid valve 10, and a booster pump 9. The solenoid valve 10 and the booster pump 9 are respectively arranged on the pipeline 41. The solenoid valve 10 and the booster pump 9 are respectively connected to the controller 2 (not shown in the figure). One end of the pipeline 41 is connected to the gas proportional valve 8 of the gas water heater, and the other end of the pipeline 41 is connected to the outlet end of the stop valve 20 of the gas water heater.

[0105] Specifically, a bypass pipeline 40 is formed by arranging a pipeline on the gas transmission pipeline 18, and an electromagnetic valve and a booster pump are installed on the pipeline. The pressure sensor 5 before the gas proportioning valve 8 monitors the gas pressure required for combustion in real time and feeds the result back to the controller 2. When the detected gas pressure value is within the preset pressure range, the electromagnetic valve is in the normally closed state and the booster pump does not operate, and the gas directly mixes with air through the gas proportioning valve 8. When the controller 2 detects that the detected gas pressure value exceeds the preset threshold range (i.e., P - P1 to P + P1), the controller 2 makes a further judgment. First, when the detected gas pressure value Pdet ≤ P - P1, the main controller reacts, controls the electromagnetic valve of the bypass pipeline 40 to open, and the booster pump starts at a speed corresponding to the difference between Pdet and P + P1 to achieve the automatic boosting function. During the process of the booster pump opening for boosting, the pressure sensor 5 detects the gas pressure in real time. When Pdet is between the values of P - P1 and P + P1, the same operation as when Pdet ≤ P - P1 is performed, and the booster pump is controlled to operate at a speed corresponding to the difference between Pdet and P + P1. If continuous boosting causes the detected gas pressure value Pdet to be greater than P + P1, the controller 2 performs corresponding logical operations (i.e., the start count of the booster pump is incremented by 1, denoted as i = i + 1), and then the controller 2 determines whether i is less than or equal to the preset start count. If the start count of the booster pump is greater than the preset start count, the controller 2 controls the electromagnetic valve and the booster pump to be normally open until the water use ends.

[0106] A gas water heater includes the above gas water heater control system.

[0107] Specifically, please refer to Figure 2 , specifically, the gas pressure detection value is collected and fed back in real time by the pressure sensor 5 arranged at the gas proportioning valve 8 of the gas water heater, and the oxygen content detection value is collected and fed back in real time by the oxygen content detector 4 arranged inside the housing of the gas water heater. The gas proportioning valve 8 is a valve used to realize the adjustment of the gas - air ratio. Please refer to Figure 2 , the gas proportioning valve 8 is arranged on the gas - air mixing pipeline, that is, the pipeline through which the air transported by the air transmission pipeline 16 and the gas transported by the gas pipeline are mixed and then transmitted. The pressure sensor 5 being arranged at the gas proportioning valve 8 can specifically be arranged at the outlet end of the gas proportioning valve 8, or can also be arranged at the inlet end of the gas proportioning valve 8, as long as the gas pressure detection value can be reasonably detected. The amount of oxygen in the air will directly affect the combustion efficiency of the gas. Therefore, in this embodiment, by arranging the oxygen content detector 4 inside the housing, the detection operation of the oxygen content in the air is carried out in real time.

[0108] The preset pressure threshold range is the range value of the gas pressure required for the high-efficiency operation of the gas water heater. In this embodiment, a bypass pipeline is provided on the gas delivery pipeline 18, and the pressure sensor 5 at the gas proportional valve 8 monitors the gas pressure required for combustion in real time, obtains the gas pressure detection value, and feeds the result back to the controller 2. A preset pressure threshold range is pre-set in the controller 2. When the controller 2 receives the gas pressure detection value, it will adjust the bypass pipeline 40 differently according to the relationship between the gas pressure detection value and the preset gas pressure threshold range, so that the finally collected gas pressure detection value is within the preset pressure threshold range, that is, the preset pressure threshold range is satisfied.

[0109] The oxygen content detection value does not satisfy the preset oxygen content threshold range, that is, the oxygen content detection value is less than the minimum value of the preset oxygen content threshold range, or the oxygen content detection value is greater than the maximum value of the preset oxygen content threshold range. The booster air pump 11 is provided on the air delivery pipeline 16. By adjusting the booster air pump 11, the amount of air (i.e., oxygen content) delivered to the gas water heater for combustion can be adjusted.

[0110] Please refer to Figure 2 , in one embodiment, the gas water heater further includes an air dehumidifier 12, and the air dehumidifier 12 is provided on the air delivery pipeline 16 of the gas water heater.

[0111] Specifically, the air dehumidifier 12 mainly achieves the purpose of drying air through the water absorption of silica gel. A dehumidifier is also provided on the air delivery pipeline 16 to dehumidify the air delivered to the gas water heater, reduce the water vapor in the air, and is more conducive to the combustion of the gas-air mixture.

[0112] Please continue to refer to Figure 2 , in one embodiment, the gas water heater further includes a flow disturbance device 30, and the flow disturbance device 30 is provided on the gas-air mixing pipe of the gas water heater.

[0113] Specifically, a flow disturbance device 30 is also installed at the gas-air mixing pipe of the gas water heater. Through the flow disturbance device 30, the mixed gas (i.e., the mixture of gas and air) is changed from laminar flow to turbulent flow, making the gas and air mix more fully, the combustion more favorable, and the heat exchange efficiency higher.

[0114] Further, in one embodiment, please refer to Figure 14 , the flow disturbance device 30 includes a flow disturbance piece 31 and a silencing spring 32, and the silencing spring 32 is arranged around the flow disturbance piece 31. Through the arrangement of the flow disturbance piece 31 and the silencing spring 32, not only can the mixed gas (i.e., the mixture of gas and air) be changed from laminar flow to turbulent flow, making the gas and air mix more fully, the combustion more favorable, and the heat exchange efficiency higher, but also the water flow sound can be suppressed to a certain extent, giving users a better water use experience.

[0115] Please refer to Figure 2 , in one embodiment, the exhaust pipe 14 of the gas water heater is a double-layer pipe. The inner pipe of the exhaust pipe 14 is used for exhausting smoke, and the outer pipe of the exhaust pipe 14 is used for conveying the air required for combustion.

[0116] Specifically, in the present application, the combustion mode of the gas water heater is full premixed combustion, and there is a separate air inlet pipe. The exhaust pipe 14 is double-layered, exhausting smoke inside, and the outer layer is heated by high-temperature flue gas during the process of conveying the air required for combustion.

[0117] For the above-mentioned gas water heater, a pressure sensor 5 is provided at the gas proportional valve 8 of the gas water heater to collect the gas pressure detection value in real time. At the same time, an oxygen content detector 4 is provided inside the housing of the gas water heater to collect the oxygen content detection value in real time. The controller 2 adjusts according to the corresponding preset pressure threshold range and the preset theoretical oxygen content value. Through the above solution, the precise control of the ratio of oxygen (or air) to gas used for combustion is realized, and the problem of low heat exchange efficiency of the gas water heater is solved from the source, ensuring the applicability of the gas water heater, and thus effectively improving the use reliability of the gas water heater.

[0118] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0119] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A control method for a gas water heater, characterized in that, Including: Obtaining a gas pressure detection value and an oxygen content detection value, where the gas pressure detection value is collected and fed back in real time by a pressure sensor disposed at a gas proportional valve of a gas water heater, and the oxygen content detection value is collected and fed back in real time by an oxygen content detector disposed inside the housing of the gas water heater; Adjusting a bypass pipeline of the gas water heater according to the gas pressure detection value and a preset pressure threshold range so that the gas pressure detection value meets the preset pressure threshold range; When the oxygen content detection value does not meet a preset oxygen content threshold range, adjusting the rotation speed of a booster pump of the gas water heater according to the oxygen content detection value and a preset theoretical oxygen content value; The step of adjusting the bypass pipeline of the gas water heater according to the gas pressure detection value and a preset pressure threshold range so that the gas pressure detection value meets the preset pressure threshold range includes: When the gas pressure detection value is less than or equal to the minimum value of the preset pressure threshold range, controlling an electromagnetic valve of the bypass pipeline of the gas water heater to open, and controlling a booster pump of the bypass pipeline of the gas water heater to operate according to a rotation speed corresponding to a difference between the gas pressure detection value and the minimum value; When the gas pressure detection value is greater than the maximum value of the preset pressure threshold range, increasing the start count of the booster pump by one; When the start count of the booster pump is greater than a preset start count, controlling the booster pump to start and operate until the water use ends; The rotation speed of the blower of the gas water heater remains unchanged.

2. The gas water heater control method according to claim 1, characterized in that, Further including: When the gas water heater is turned on and running, performing self-checking in real time according to a state parameter value of the gas water heater, where the state parameter value is collected and fed back by a state parameter collection device of the gas water heater.

3. The gas water heater control method according to claim 2, characterized in that, The self-checking according to the state parameter value of the gas water heater includes: Judging whether the state parameter of the gas water heater meets a corresponding preset fluctuation range; When the state parameter meets the corresponding preset fluctuation range, obtaining a heat exchange efficiency of the gas water heater according to the state parameter; When the heat exchange efficiency is less than a preset heat exchange efficiency threshold, outputting a fault prompt message.

4. The gas water heater control method according to claim 3, wherein, After the step of judging whether the state parameter of the gas water heater meets a corresponding preset fluctuation range, further including: When the state parameter does not meet the corresponding preset fluctuation range, performing automatic adjustment according to a set outlet water temperature so that the state parameter meets the corresponding preset fluctuation range.

5. The gas water heater control method according to claim 2, wherein The state parameter includes a gas calorific value, and the self-checking according to the state parameter value of the gas water heater includes: Judging whether an absolute value of a difference between the gas calorific value and the minimum value of a preset gas calorific value threshold range is less than or equal to a preset error value, or whether an absolute value of a difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is less than or equal to the preset error value; When the absolute value of the difference between the gas calorific value and the minimum value of the preset gas calorific value threshold range is less than or equal to the preset error value, or the absolute value of the difference between the gas calorific value and the maximum value of the preset gas calorific value threshold range is less than or equal to the preset error value, adjusting the gas flow rate so that the gas calorific value meets the preset gas calorific value threshold range.

6. The gas water heater control method according to claim 5, wherein, After the step of determining whether the absolute value of the difference between the calorific value of the gas and the minimum value of the preset calorific value threshold range of the gas is less than or equal to the preset error value, or whether the absolute value of the difference between the calorific value of the gas and the maximum value of the preset calorific value threshold range of the gas is less than or equal to the preset error value, the following is further included: When the absolute value of the difference between the calorific value of the gas and the minimum value of the preset calorific value threshold range of the gas is greater than the preset error value, or the absolute value of the difference between the calorific value of the gas and the maximum value of the gas calorific value content threshold range is greater than the preset error value, a combustion parameter mismatch prompt message is output.

7. The gas water heater control method according to claim 1, wherein After the step of increasing the start count of the booster pump by one when the detected gas pressure value is greater than the maximum value of the preset pressure threshold range, the following is further included: When the start count of the booster pump is less than or equal to the preset start count, the booster pump is controlled to close.

8. A control device for a gas water heater, characterized in that, Including: A detection value acquisition module for acquiring a gas pressure detection value and an oxygen content detection value. The gas pressure detection value is collected and fed back in real time by a pressure sensor disposed at a gas proportional valve of the gas water heater, and the oxygen content detection value is collected and fed back in real time by an oxygen content detector disposed inside the housing of the gas water heater; A gas pressure adjustment module for adjusting a bypass pipeline of the gas water heater according to the gas pressure detection value and a preset pressure threshold range so that the gas pressure detection value meets the preset pressure threshold range; An air adjustment module for adjusting the rotation speed of a supercharging air pump of the gas water heater according to the oxygen content detection value and a preset theoretical oxygen content value when the oxygen content detection value does not meet a preset oxygen content threshold range; The gas pressure adjustment module is specifically configured to, when the gas pressure detection value is less than or equal to the minimum value of the preset pressure threshold range, control the solenoid valve of the bypass pipeline of the gas water heater to open, and control the booster pump of the bypass pipeline of the gas water heater to operate according to the rotation speed corresponding to the difference between the gas pressure detection value and the minimum value; when the gas pressure detection value is greater than the maximum value of the preset pressure threshold range, the start count of the booster pump is increased by one; when the start count of the booster pump is greater than the preset start count, control the booster pump to start and operate until the water use ends; The fan rotation speed of the gas water heater remains unchanged.

9. A gas water heater control system, characterized in that, Including a pressure sensor, an oxygen content detector, a bypass pipeline, a supercharging air pump and a controller. The pressure sensor, the oxygen content detector, the bypass pipeline and the supercharging air pump are respectively connected to the controller. The pressure sensor is disposed at the gas proportional valve of the gas water heater, the oxygen content detector is disposed inside the housing of the gas water heater, the bypass pipeline is disposed in the gas transmission pipeline of the gas water heater, and the supercharging air pump is disposed in the air transmission pipeline of the gas water heater. The pressure sensor is used to collect the gas pressure detection value in real time and feed it back to the controller. The oxygen content detector is used to collect the oxygen content detection value in real time and feed it back to the controller. The controller is used to perform combustion control according to the method described in any one of claims 1-7.

10. The gas water heater control system according to claim 9, characterized in that, It further includes a state parameter acquisition device, and the state parameter acquisition device is connected to the controller.

11. The gas water heater control system according to claim 10, wherein The state parameter acquisition device includes at least one of a gas chromatograph mass spectrometer monitor, a water flow sensor, and a temperature sensor.

12. The gas water heater control system according to claim 9, wherein, The bypass pipeline includes a pipeline, a solenoid valve, and a booster pump. The solenoid valve and the booster pump are respectively arranged on the pipeline, and the solenoid valve and the booster pump are respectively connected to the controller. One end of the pipeline is connected to the gas proportional valve of the gas water heater, and the other end of the pipeline is connected to the outlet end of the stop valve of the gas water heater.

13. A gas water heater, characterized in that, It includes the gas water heater control system according to any one of claims 9-12.

14. The gas water heater according to claim 13, characterized in that, It further includes an air dehumidifier, and the air dehumidifier is arranged on the air delivery pipeline of the gas water heater.

15. The gas water heater according to claim 13, characterized in that, It further includes a flow disturbance device, and the flow disturbance device is arranged on the gas and air mixing pipe of the gas water heater.

16. The gas water heater according to claim 13, characterized in that, The exhaust pipe of the gas water heater is a double-layer pipe. The inner pipe of the exhaust pipe is used for exhausting smoke, and the outer pipe of the exhaust pipe is used for delivering the air required for combustion.

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