Gas water heater and control method, device and storage medium thereof

Abstract

The present invention discloses a gas water heater and a control method, device, and storage medium thereof. The method includes: obtaining a speed adjustment value of an air intake fan of the gas water heater and obtaining a reference pressure value based on the speed adjustment value; obtaining a first measured pressure value in a flue of the gas water heater; and obtaining a correction value based on the first measured pressure value and the reference pressure value, using the correction value to correct a preset pressure threshold and a reference pressure value of the gas water heater, and storing the corrected preset pressure threshold and reference pressure value, wherein the preset pressure threshold includes a first pressure threshold and a second pressure threshold. The present invention improves the accuracy of gas water heater control in practical applications.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment control, and in particular to a gas water heater and a control method, device, and storage medium thereof. Background Art

[0002] A gas water heater, also known as a gas water boiler, is a gas appliance that uses gas as fuel and transfers heat to cold water flowing through a heat exchanger through combustion heating to prepare hot water.

[0003] At present, when gas water heaters are produced in large quantities, the pressure values ​​detected by the pressure detection devices (such as pressure sensors) of each gas water heater vary within a reasonable range. If the same fixed preset pressure threshold is used as the comparison critical value of the pressure value in the flue of each gas water heater, the operating parameters of the gas water heater cannot be adjusted in time, thereby reducing the accuracy of gas water heater control in actual applications. Summary of the Invention

[0004] The embodiments of the present application provide a gas water heater and its control method, device, and storage medium, aiming to solve the problem of differences in pressure values ​​detected by the pressure detection device of each gas water heater in mass production. A fixed and identical preset pressure threshold is used as the comparison critical value of the pressure value in the flue of each gas water heater, thereby reducing the technical problem of the accuracy of gas water heater control in actual applications.

[0005] An embodiment of the present application provides a gas water heater control method, the gas water heater control method comprising:

[0006] Obtaining a speed adjustment value of an air intake fan of the gas water heater, and obtaining a reference pressure value based on the speed adjustment value; wherein the reference pressure value is a pressure value in the flue measured when the air intake fan in a reference gas water heater prototype is operated at a preset speed adjustment value;

[0007] Obtaining a first measured pressure value in the flue of the gas water heater;

[0008] A correction value is obtained according to the first measured pressure value and the reference pressure value, the preset pressure threshold and the reference pressure value of the gas water heater are corrected using the correction value, and the corrected preset pressure threshold and the reference pressure value are stored.

[0009] In one embodiment, the step of obtaining a correction value according to the first measured pressure value and the reference pressure value includes:

[0010] A difference between the first measured pressure value and the reference pressure value is obtained, and the difference is used as the correction value.

[0011] In one embodiment, the preset pressure threshold includes a first pressure threshold and a second pressure threshold, the first pressure threshold is less than the second pressure threshold, and the step of correcting the preset pressure threshold and the reference pressure value of the gas water heater using the correction value includes:

[0012] Summing the correction value and the first pressure threshold to obtain a corrected first pressure threshold;

[0013] Summing the correction value and the second pressure threshold to obtain a corrected second pressure threshold;

[0014] Summing the correction value and the reference pressure value to obtain the corrected reference pressure value;

[0015] The corrected second pressure threshold is greater than the corrected first pressure threshold.

[0016] In one embodiment, the gas water heater control method further includes:

[0017] Obtaining a second measured pressure value in the flue of the gas water heater;

[0018] When the second measured pressure value is greater than the corrected first pressure threshold, the air-fuel ratio in the combustion chamber of the gas water heater is adjusted.

[0019] In one embodiment, after the step of obtaining the second measured pressure value of the flue of the gas water heater, the method further includes:

[0020] When the second measured pressure value is greater than the corrected first pressure threshold, obtaining a current second measured pressure value of the flue of the gas water heater;

[0021] When the current second measured pressure value is greater than or equal to the corrected second pressure threshold, shutting down the water heater and / or outputting an alarm message indicating an abnormal pressure value;

[0022] When the current second measured pressure value is less than the corrected second pressure threshold, the step of adjusting the air-fuel ratio in the combustion chamber of the gas water heater is performed.

[0023] In one embodiment, the step of adjusting the air-fuel ratio in the combustion chamber of the gas water heater includes:

[0024] Increase the speed adjustment value of the air intake fan of the gas water heater to increase the air ratio in the combustion chamber of the gas water heater, and / or reduce the opening adjustment value of the gas proportional valve of the gas water heater to reduce the gas ratio of the gas water heater.

[0025] In one embodiment, the step of increasing the speed adjustment value of the air intake fan of the gas water heater includes:

[0026] Obtaining a preset speed adjustment increment of the intake fan;

[0027] The speed adjustment value of the intake fan is increased according to the preset speed adjustment increment.

[0028] In one embodiment, the step of reducing the opening adjustment value of the gas proportional valve of the gas water heater includes:

[0029] Obtaining a preset opening adjustment increment of the gas proportional valve;

[0030] The opening adjustment value of the gas proportional valve is reduced according to the preset opening adjustment increment.

[0031] In one embodiment, the step of obtaining the speed adjustment value of the air intake fan of the gas water heater includes:

[0032] Obtaining the required hot water production rate of the gas water heater;

[0033] The speed adjustment value of the air intake fan is obtained according to the required hot water production rate and the corresponding relationship between the preset required hot water production rate and the preset speed adjustment value.

[0034] In addition, to achieve the above-mentioned purpose, the present invention also provides a gas water heater control device including: a memory, a processor and a gas water heater control program stored on the memory and runnable on the processor. When the gas water heater control program is executed by the processor, the steps of the above-mentioned gas water heater control method are implemented.

[0035] In addition, to achieve the above-mentioned purpose, the present invention also provides a gas water heater comprising: a memory, a processor and a gas water heater control program stored on the memory and runnable on the processor, wherein the gas water heater control program implements the steps of the above-mentioned gas water heater control method when executed by the processor; or, the gas water heater includes the above-mentioned gas water heater control device.

[0036] In addition, to achieve the above-mentioned purpose, the present invention also provides a storage medium on which a gas water heater control program is stored. When the gas water heater control program is executed by a processor, the steps of the above-mentioned gas water heater control method are implemented.

[0037] The technical solutions of a gas water heater and its control method, device, and storage medium provided in the embodiments of the present application have at least the following technical effects or advantages:

[0038] The invention adopts the method of obtaining the speed adjustment value of the air intake fan of the gas water heater and obtaining the reference pressure value according to the speed adjustment value, wherein the reference pressure value is the pressure value in the flue measured when the air intake fan in the benchmark gas water heater prototype runs according to the preset speed adjustment value, and then obtaining the first measured pressure value in the flue of the gas water heater, and obtaining the correction value according to the first measured pressure value and the reference pressure value, using the correction value to correct the preset pressure threshold and the reference pressure value of the gas water heater, and storing the corrected preset pressure threshold and the reference pressure value. This technical solution solves the problem of differences in pressure values ​​detected by the pressure detection device of each gas water heater in mass production, and uses the same fixed preset pressure threshold as the comparison critical value of the pressure value in the flue of each gas water heater, thereby reducing the technical problem of accuracy of gas water heater control in actual applications and improving the accuracy of gas water heater control in actual applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the hardware operating environment involved in an embodiment of the present invention;

[0040] Figure 2 It is a structural schematic diagram of the gas water heater of the present invention;

[0041] Figure 3 This is a flow chart of a first embodiment of a gas water heater control method according to the present invention;

[0042] Figure 4 This is a flow chart of a second embodiment of a gas water heater control method according to the present invention;

[0043] Figure 5 This is a flow chart of a third embodiment of a gas water heater control method according to the present invention;

[0044] Figure 6 This is a flow chart of a fourth embodiment of a gas water heater control method according to the present invention;

[0045] Figure 7 Schematic diagram of the relationship between the speed adjustment value of the air intake fan of the present invention, the first measured pressure value and the reference pressure value;

[0046] Figure 8 Schematic diagram of the relationship between the required hot water production rate and operating parameters of the gas water heater of the present invention. DETAILED DESCRIPTION

[0047] To better understand the above technical solutions, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0048] The present application addresses the problem that there are differences in the pressure values ​​detected by the pressure detection device of each gas water heater in mass production. A fixed and identical preset pressure threshold is used as the comparison critical value for the pressure value in the flue of each gas water heater, thereby reducing the technical problem of the accuracy of gas water heater control in actual applications. The application adopts the method of obtaining the speed adjustment value of the air intake fan of the gas water heater, and obtaining the reference pressure value based on the speed adjustment value. The reference pressure value is the pressure value in the flue measured when the air intake fan in the reference gas water heater prototype is operated according to the preset speed adjustment value. Then, the first measured pressure value in the flue of the gas water heater is obtained, and a correction value is obtained based on the first measured pressure value and the reference pressure value. The preset pressure threshold and the reference pressure value of the gas water heater are corrected using the correction value, and the corrected preset pressure threshold and the reference pressure value are stored, thereby improving the accuracy of gas water heater control in actual applications.

[0049] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of the hardware operating environment involved in the embodiment of the present invention.

[0050] It should be noted that Figure 1 This is a structural diagram of the hardware operating environment of the gas water heater.

[0051] like Figure 1 As shown, the gas water heater may include: a processor 1001, such as a CPU, a memory 1005, a user interface 1003, a network interface 1004, and a communication bus 1002. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display and an input unit, such as a keyboard. Optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory, such as a disk storage device. The memory 1005 may also be a storage device independent of the processor 1001.

[0052] Those skilled in the art will understand that Figure 1The structure of the gas water heater shown in the figure does not constitute a limitation to the gas water heater, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0053] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a gas water heater control program. The operating system is a program that manages and controls the hardware and software resources of the gas water heater, and the operation of the gas water heater control program and other software or programs.

[0054] exist Figure 1 In the gas water heater shown, the user interface 1003 is mainly used to connect to the terminal and communicate data with the terminal; the network interface 1004 is mainly used for the background server and communicates data with the background server; the processor 1001 can be used to call the gas water heater control program stored in the memory 1005.

[0055] In this embodiment, the gas water heater includes: a memory 1005, a processor 1001, and a gas water heater control program stored in the memory 1005 and executable on the processor, wherein:

[0056] When the processor 1001 calls the gas water heater control program stored in the memory 1005, it performs the following operations:

[0057] Obtaining a speed adjustment value of an air intake fan of the gas water heater, and obtaining a reference pressure value based on the speed adjustment value; wherein the reference pressure value is a pressure value in the flue measured when the air intake fan in a reference gas water heater prototype is operated at a preset speed adjustment value;

[0058] Obtaining a first measured pressure value in the flue of the gas water heater;

[0059] A correction value is obtained according to the first measured pressure value and the reference pressure value, the preset pressure threshold and the reference pressure value of the gas water heater are corrected using the correction value, and the corrected preset pressure threshold and the reference pressure value are stored.

[0060] The embodiment of the present invention provides an embodiment of a gas water heater control method. It should be noted that although a logical sequence is shown in the flow chart, in some cases, the steps shown or described may be performed in an order different from that shown here.

[0061] like Figure 2As shown in the figure, 101 represents an air intake fan (also known as a blower), 102 represents a gas proportional valve, 103 represents a burner, 104 represents a combustion chamber, 105 represents a heat exchanger, and 106 represents a smoke exhaust pipe. The gas water heater includes a housing, within which are disposed an air intake fan, a gas proportional valve, a burner, a combustion chamber, and a heat exchanger. The combustion chamber includes a burner and a heat exchanger, which are separated from each other, with the burner located at the bottom of the combustion chamber and the heat exchanger located at the top of the combustion chamber. The air intake fan and gas proportional valve are both located at the bottom of the burner. The air intake fan is used to deliver air to the combustion chamber (providing oxygen for gas combustion). The gas proportional valve is connected to the gas pipeline. Adjusting the opening of the gas proportional valve adjusts the amount of gas entering the combustion chamber, for example, increasing or decreasing the amount of gas entering the combustion chamber. Adjusting the speed of the air intake fan adjusts the amount of air entering the combustion chamber, for example, increasing or decreasing the amount of air entering the combustion chamber. Adjusting the opening of the gas proportional valve and / or the speed of the air intake fan adjusts the air-fuel ratio within the combustion chamber. The burner burns gas, and the heat generated by the gas combustion heats the water in the heat exchanger, thereby providing hot water for users. An exhaust pipe is located at the top of the housing, through which the smoke generated by the combustion of gas in the combustion chamber is discharged to the environment outside the housing.

[0062] Among them, when the gas water heater is working, the air discharged from the air outlet of the air intake fan will pass through the burner into the combustion chamber, and the smoke generated in the combustion chamber will be discharged to the external environment of the shell through the exhaust pipe. The air outlet of the air intake fan, the burner, the combustion chamber and the exhaust pipe are connected in sequence, that is, a passage is formed. The passage between the air outlet of the air intake fan and the outlet of the exhaust pipe can be understood as the flue of the gas water heater.

[0063] like Figure 3 As shown, in the first embodiment of the present application, the gas water heater control method of the present application includes the following steps:

[0064] Step S110: obtaining a speed adjustment value of an air inlet fan of a gas water heater, and obtaining a reference pressure value according to the speed adjustment value.

[0065] In this embodiment, the reference pressure value is the pressure value in the flue measured when the intake fan in the reference gas water heater prototype is operated at a preset speed adjustment value. The reference gas water heater prototype can be understood as a reference gas water heater pre-set by the designer when designing the equipment specifications. When mass-producing gas water heaters, each gas water heater produced is produced according to the performance indicators of the reference gas water heater prototype. After setting up the reference gas water heater prototype, the intake fan in the reference gas water heater prototype is operated at different preset speed adjustment values ​​to measure the pressure value in the flue. The measured pressure value is the reference pressure value, thereby obtaining different reference pressure values ​​corresponding to the intake fan in the reference gas water heater prototype operating at different preset speed adjustment values.

[0066] When the intake fan in the benchmark gas water heater prototype operates at different preset speed adjustment values, the different preset speed adjustment values ​​refer to a set of speed adjustment values, specifically a range of values. For example, the range is 50-200. In this test environment, the system operates at two speed adjustment values ​​(50, 200), or four adjustment values ​​(50, 100, 150, 200), and so on. The flue pressure values ​​measured at these multiple speed adjustment values ​​are a set of pressure values, corresponding one-to-one with each speed adjustment value, thereby obtaining a benchmark pressure value. Furthermore, the preset speed adjustment value is denoted as PR, and the benchmark pressure value is denoted as h0. If the benchmark pressure value measured when the intake fan operates at the preset speed adjustment value PR is h0, then there is a corresponding relationship between the speed adjustment value and the benchmark pressure value of the intake fan in the benchmark gas water heater prototype, i.e., PR corresponds to h0. This allows the corresponding relationship between the speed adjustment value and the measured benchmark pressure value of the intake fan in the benchmark gas water heater prototype to be established.

[0067] Specifically, during the production of a gas water heater, a pressure detection device, such as a pressure sensor, is installed in the flue. The pressure sensor includes a pressure detection probe, which is positioned at a certain location in the flue. In one example, the pressure detection probe can be located between the air outlet of the air intake fan and the burner, or within the exhaust pipe, for example. While the gas water heater is producing hot water, the pressure sensor monitors the pressure in the flue in real time, and the gas water heater obtains the flue pressure value based on the pressure detection data.

[0068] During mass production of gas water heaters, the pressure values ​​detected by the pressure detection devices (e.g., pressure sensors) of each produced gas water heater vary within a reasonable range from those of other gas water heaters. When these gas water heaters are put into practical use, they are compared with the measured pressure values ​​in the gas water heater's flue according to a fixed, identical preset pressure threshold and reference pressure value. This is used to control the gas water heaters, specifically to adjust the operating parameters of the gas water heaters (e.g., the blower speed adjustment value). This often results in inaccurate gas water heater control. Therefore, to improve the accuracy of gas water heater control in practical applications, the preset pressure threshold and reference pressure values ​​for each gas water heater need to be corrected. To correct the preset pressure threshold and reference pressure values, the gas water heaters must first be operated in a test environment. After the gas water heaters are operational, the speed adjustment value of the gas water heater's intake fan is obtained. Since a correspondence between the speed adjustment value of the intake fan in a benchmark gas water heater prototype and the measured reference pressure value is pre-established, the reference pressure value corresponding to the obtained speed adjustment value can be found using the obtained speed adjustment value and the correspondence. The speed adjustment value may be understood as a PWM fan control set value, or a fan control adjustment set value, or a fan adjustment set value, or a fan control adjustment value.

[0069] Step S120: obtaining a first measured pressure value in the flue of the gas water heater.

[0070] In this embodiment, after obtaining the speed adjustment value, the speed of the intake fan is adjusted based on the speed adjustment value to obtain the required speed for operation, i.e., the demanded speed. The intake fan is then controlled to operate at the demanded speed. After the gas water heater is operational, a first measured pressure value is obtained. This first measured pressure value is the pressure value measured by a pressure sensor when the gas water heater is operating in a test environment. After obtaining the first measured pressure value, a correspondence can be established between the speed adjustment value, the reference pressure value, and the first measured pressure value.

[0071] like Figure 7 As shown in the figure, the x-axis represents the preset speed adjustment value PR of the air intake fan, and the y-axis represents the first measured pressure value hn and the reference pressure value h0. The preset speed adjustment value PR of the air intake fan corresponds to a set of hn and h0, and n represents the number of the gas water heater produced. For example, when the third gas water heater produced is running in the test environment, the first measured pressure value is h3. The current speed adjustment value of the air intake fan installed in the third gas water heater is PR. According to Figure 7According to PR, a set of first measured pressure values ​​and reference pressure values, i.e., h3 and h0, can be found. For example, when the fourth gas water heater produced is running in the test environment, the current speed adjustment value of the air intake fan installed in the fourth gas water heater produced is PR. Figure 7 Based on the PR, we can find a set of first measured pressure values ​​and reference pressure values, namely h4 and h0. Here, the measured hn for each of the n gas water heaters is controlled using the same set of PR and h0 corresponding to the PR. In other words, no matter how many gas water heaters are produced, each gas water heater is controlled using the same set of PR and h0 corresponding to the PR.

[0072] Step S130: obtaining a correction value according to the first measured pressure value and the reference pressure value, using the correction value to correct the preset pressure threshold and the reference pressure value of the gas water heater, and storing the corrected preset pressure threshold and the reference pressure value.

[0073] In this embodiment, for a gas water heater, after obtaining the baseline pressure value and the first measured pressure value of the gas water heater, the difference between the first measured pressure value and the baseline pressure value is calculated and used as the correction value: correction value = first measured pressure value - baseline pressure value. In this embodiment, dn is represented as the correction value, where dn = hn - h0, where n represents the production number of the gas water heater. Assume that this gas water heater is the fifth unit produced, so d5 = h5 - h0.

[0074] The preset pressure threshold includes a first pressure threshold and a second pressure threshold, where the first pressure threshold is less than the second pressure threshold. Furthermore, after obtaining the correction value, the preset pressure threshold and the reference pressure value are corrected according to the correction value. That is, the first pressure threshold, the second pressure threshold, and the reference pressure value are respectively increased by the correction value. Specifically, the correction value is summed with the first pressure threshold to obtain a corrected first pressure threshold; the correction value is summed with the second pressure threshold to obtain a corrected second pressure threshold; and the correction value is summed with the reference pressure value to obtain a corrected reference pressure value. The corrected second pressure threshold is greater than the corrected first pressure threshold. In this embodiment, H1 is represented as the first pressure threshold, H2 is represented as the second pressure threshold, H'1 is represented as the corrected first pressure threshold, and H'2 is represented as the corrected second pressure threshold. That is, H'1 = H1 + dn, and H'2 = H2 + dn. If the gas water heater currently produced is the fifth one, then H'1 = H1 + d5, H'2 = H2 + d5, and H'2 > H'1.

[0075] Furthermore, after correcting the first pressure threshold, the second pressure threshold and the reference pressure value, the corrected first pressure threshold, the corrected second pressure threshold and the corrected reference pressure value are stored. When the gas water heater is actually used, the corrected first pressure threshold, the corrected second pressure threshold and the corrected reference pressure value are compared with the second measured pressure value in the flue of the gas water heater to realize the control of the gas water heater, thereby improving the accuracy of the control of the gas water heater in actual applications.

[0076] like Figure 4 As shown, in the second embodiment of the present application, the gas water heater control method further includes the following steps:

[0077] Step S140: obtaining a second measured pressure value in the flue of the gas water heater.

[0078] Step S141: determine whether the second measured pressure value is greater than the corrected first pressure threshold value; if so, execute step S142; if not, return to execute step S140.

[0079] Step S142: adjusting the air-fuel ratio in the combustion chamber of the gas water heater.

[0080] In practice, when a gas water heater produces hot water, under normal ambient pressure, there is a pressure difference between the pressure in the flue of the gas water heater and the pressure in the external environment. The pressure in the flue is greater than the pressure in the external environment, and the flue gas generated by the combustion of gas in the combustion chamber is discharged to the outside environment through the flue pipe. If the pressure in the external environment increases, the flue pipe of the gas water heater may become blocked, preventing the flue gas from being discharged in a timely manner. This makes it difficult for air from the external environment to enter the combustion chamber through the intake fan, and the air in the combustion chamber cannot be replenished in a timely manner. As a result, the air in the combustion chamber is insufficient. Since the amount of gas entering the combustion chamber through the gas proportional valve is fixed, if a fixed amount of gas is continuously supplied to the combustion chamber when the air in the combustion chamber is insufficient, some of the gas can be burned while some cannot. As a result, the gas entering the combustion chamber cannot be fully burned, resulting in not only wasted gas, but the unburned gas will also mix with the flue gas and be discharged to the outside environment through the flue pipe, causing air pollution.

[0081] In this embodiment, the corrected first pressure threshold and the second measured pressure value in the flue are used to determine whether the exhaust pipe of the gas water heater is blocked from exhausting smoke. Specifically, after obtaining the second measured pressure value in the flue, it is determined whether the second measured pressure value is greater than the corrected first pressure threshold. If the second measured pressure value is greater than the corrected first pressure threshold, it is determined that the exhaust pipe of the gas water heater is blocked from exhausting smoke, and it is necessary to adjust the air-fuel ratio in the combustion chamber of the gas water heater. The air-fuel ratio refers to the ratio of air to gas. Among them, adjusting the air-fuel ratio in the combustion chamber of the gas water heater refers to increasing the speed adjustment value of the air intake fan and / or reducing the opening adjustment value of the gas proportional valve of the gas water heater, that is, increasing the speed of the air intake fan and / or reducing the opening of the gas proportional valve of the gas water heater. In this way, the air-fuel ratio in the combustion chamber of the gas water heater can be adjusted. The required speed of the intake fan = the original speed + the speed adjustment value; the required opening of the gas proportional valve = the original opening - the opening adjustment value. Increasing the speed adjustment value of the intake fan increases the speed of the intake fan, and decreasing the opening adjustment value of the gas proportional valve decreases the opening of the gas proportional valve. If the second measured pressure value is greater than or equal to the corrected baseline pressure value, and the second measured pressure value is less than or equal to the corrected first pressure threshold, the gas water heater is operating properly and there is no need to adjust the air-fuel ratio in the combustion chamber of the gas water heater.

[0082] Increasing the intake fan speed adjustment value includes obtaining a preset speed adjustment increment for the intake fan, and increasing the intake fan speed adjustment value according to the preset speed adjustment increment. In one example, assuming the intake fan speed adjustment value is PR, the preset speed adjustment increment is dP1, the second measured pressure value in the flue is h, and the corrected first pressure threshold is H'1, the increased intake fan speed adjustment value is PR1. If h ≤ H'1, PR remains unchanged; if h > H'1, PR1 = PR + dP1. Increasing the intake fan speed adjustment value increases the intake fan speed, increasing the amount of air entering the combustion chamber and thereby increasing the air ratio in the combustion chamber. Specifically, if the exhaust pipe is obstructed, resulting in a low air ratio in the combustion chamber, and the amount of gas entering the combustion chamber remains unchanged, increasing the air ratio in the combustion chamber ensures sufficient oxygen in the combustion chamber to assist in the combustion of the gas, allowing for more complete combustion of the gas in the combustion chamber and reducing gas waste.

[0083] Reducing the opening adjustment value of the gas proportional valve includes: obtaining a preset opening adjustment increment for the gas proportional valve, and then reducing the opening adjustment value of the gas proportional valve based on the preset opening adjustment increment. In one example, assuming the current opening adjustment value of the gas proportional valve is PV, the preset opening adjustment increment is dP2, the second measured pressure value obtained in the flue is h, and the corrected first pressure threshold is H'1, the reduced opening adjustment value of the proportional valve is PV1. Specifically, if h ≤ H'1, PV remains unchanged; if h > H'1, PV1 = PV - dP2. Reducing the opening adjustment value of the gas proportional valve reduces the opening of the gas proportional valve, thereby reducing the amount of gas entering the combustion chamber and thus reducing the gas ratio in the combustion chamber. Specifically, if the exhaust pipe is obstructed, resulting in a low air ratio in the combustion chamber, reducing the gas ratio in the combustion chamber can ensure more complete combustion of the gas in the combustion chamber, thereby reducing gas waste.

[0084] Furthermore, the amount of air entering the combustion chamber can be increased by increasing the speed adjustment value of the intake fan, and / or the amount of gas entering the combustion chamber can be reduced by reducing the opening adjustment value of the gas proportioning valve. In this way, the air-fuel ratio in the combustion chamber is adjusted, which is conducive to more complete combustion of the gas in the combustion chamber and reduces gas waste.

[0085] like Figure 5 As shown, in the third embodiment of the present application, the following steps may be further included after step S140:

[0086] Step S1411: when the second measured pressure value is greater than the corrected first pressure threshold, obtaining a current second measured pressure value of the flue of the gas water heater;

[0087] Step S1412: Determine whether the current second measured pressure value is greater than or equal to the corrected second pressure threshold; if so, execute step S1413 and / or step S1414; if not, execute step S1415.

[0088] Step S1413: Turn off the water heater.

[0089] Step S1414: Outputting an alarm message indicating abnormal pressure value.

[0090] Step S1415: Adjusting the air-fuel ratio in the combustion chamber of the gas water heater.

[0091] In this embodiment, the revised second pressure threshold can be understood as the abnormal pressure alarm value in the flue. The revised second pressure threshold and the obtained current second measured pressure value in the flue are used to determine whether the pressure in the flue of the gas water heater is abnormal and whether the gas water heater has a safety hazard. Specifically, assuming that the previously obtained second measured pressure value is greater than the revised first pressure threshold, the current second measured pressure value in the flue obtained is h', and the revised second pressure threshold is H'2. After obtaining the current second measured pressure value h' in the flue, it is determined whether h' is greater than or equal to H'2. If h' is less than H'2, the air-fuel ratio in the combustion chamber of the gas water heater is adjusted to increase the amount of air entering the combustion chamber and / or reduce the amount of gas entering the combustion chamber, thereby adjusting the air-fuel ratio so that the gas in the combustion chamber is more fully burned. If h´≥H´2, it is determined that the pressure in the flue of the gas water heater is abnormal. The gas water heater may have a safety hazard due to excessive pressure in the flue. In this case, the gas water heater can be controlled to be shut down directly, and an alarm message of abnormal pressure value of the gas water heater can be sent to the user. The gas water heater can also be controlled to be shut down directly and an alarm message of abnormal pressure value of the gas water heater can be sent at the same time. The alarm message can promptly remind the user to respond to the abnormality of the gas water heater, thereby reducing the occurrence of safety hazards. The alarm message can be a warning sound, an abnormal prompt voice, etc.

[0092] Adjusting the air-fuel ratio in the combustion chamber of the gas water heater refers to increasing the speed adjustment value of the intake fan and / or decreasing the opening adjustment value of the gas proportional valve of the gas water heater, that is, increasing the speed of the intake fan and / or decreasing the opening of the gas proportional valve. Specifically, increasing the speed adjustment value of the intake fan includes obtaining a preset speed adjustment increment for the intake fan and increasing the speed adjustment value of the intake fan according to the preset speed adjustment increment. Assuming that the speed adjustment value of the intake fan is PR, the preset speed adjustment increment is dP1, the second measured pressure value obtained in the flue is h, and the corrected first pressure threshold is H´1, the increased speed adjustment value of the intake fan is PR1. If h ≤ H´1, PR remains unchanged; if h > H´1, PR1 = PR + dP1. Increasing the speed adjustment value of the intake fan increases the speed of the intake fan, thereby increasing the amount of air entering the combustion chamber and thus increasing the air ratio in the combustion chamber. Reducing the gas proportional valve opening adjustment value includes obtaining a preset opening adjustment increment for the gas proportional valve, and then reducing the gas proportional valve opening adjustment value based on the preset opening adjustment increment. Assuming the current gas proportional valve opening adjustment value is PV, the preset opening adjustment increment is dP2, the second measured flue pressure value obtained is h, and the corrected first pressure threshold is H'1, the reduced proportional valve opening adjustment value is PV1. Specifically, if h ≤ H'1, PV remains unchanged; if h > H'1, PV1 = PV - dP2. Reducing the gas proportional valve opening adjustment value reduces the valve opening, thereby reducing the amount of gas entering the combustion chamber and thus reducing the gas ratio in the combustion chamber. Increasing the intake fan speed adjustment value can increase the amount of air entering the combustion chamber, and / or reducing the gas proportional valve opening adjustment value can reduce the amount of gas entering the combustion chamber. This achieves adjustment of the air-fuel ratio in the combustion chamber, facilitating more complete combustion of the gas in the combustion chamber and reducing gas waste.

[0093] like Figure 6 As shown, in the fourth embodiment of the present application, step S210, obtaining the speed adjustment value of the air intake fan of the gas water heater includes the following steps:

[0094] Step S001: Obtain the required hot water production rate of the gas water heater.

[0095] Step S002: obtaining the speed adjustment value of the intake fan according to the required hot water production rate and the corresponding relationship between the preset required hot water production rate and the preset speed adjustment value.

[0096] In this embodiment, the required hot water production rate is obtained based on the water flow rate and the water inlet temperature. That is, the water flow rate, water inlet temperature and the user's set temperature of the water entering the heat exchanger are obtained, and the required hot water production rate of the gas water heater is calculated based on the water flow rate, water temperature and the set temperature. Different required hot water production rates correspond to different operating parameters, including the speed adjustment value of the air inlet fan and the opening adjustment value of the gas proportional valve. Figure 8 As shown in the figure, the horizontal axis represents the preset required hot water production rate, and the vertical axis represents the preset intake fan speed adjustment value PR and the preset gas proportional valve opening adjustment value PV. Each preset required hot water production rate corresponds to a preset intake fan speed adjustment value and a preset gas proportional valve opening adjustment value. Based on the combination of the preset required hot water production rate and the preset speed adjustment value, the intake fan speed adjustment value is adjusted according to the hot water production demand during operation to meet the required hot water production rate.

[0097] After obtaining the current demand hot water production rate of the gas water heater, search for Figure 8 By considering the relationship between the demanded hot water production rate and the operating parameters, the speed adjustment value of the air intake fan and the opening adjustment value of the gas proportional valve corresponding to the current demanded hot water production rate can be obtained. The obtained speed adjustment value and opening adjustment value can be understood as the demanded speed adjustment value and the demanded opening adjustment value, and then the operation of the gas water heater is controlled according to the demanded speed adjustment value and the demanded opening adjustment value, and then the relevant steps of correcting the preset pressure threshold and the reference pressure value are executed.

[0098] Furthermore, the present invention also provides a gas water heater control device comprising: a memory, a processor, and a gas water heater control program stored in the memory and runnable on the processor, wherein the gas water heater control program implements the steps of the above-mentioned gas water heater control method when executed by the processor.

[0099] Furthermore, to achieve the above-mentioned purpose, the present invention also provides a gas water heater comprising: a memory, a processor and a gas water heater control program stored on the memory and executable on the processor, wherein the gas water heater control program implements the steps of the above-mentioned gas water heater control method when executed by the processor; or, the gas water heater comprises the above-mentioned gas water heater control device.

[0100] Furthermore, to achieve the above-mentioned purpose, the present invention also provides a storage medium on which a gas water heater control program is stored. When the gas water heater control program is executed by a processor, the steps of the above-mentioned gas water heater control method are implemented.

[0101] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0102] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0103] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0104] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0105] It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claim. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third etc. does not indicate any order. These words may be interpreted as names.

[0106] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0107] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A gas water heater control method, characterized in that: The gas water heater control method includes: Obtaining a speed adjustment value of an air intake fan of the gas water heater, and obtaining a reference pressure value based on the speed adjustment value; wherein the reference pressure value is a pressure value in the flue measured when the air intake fan in a reference gas water heater prototype is operated at a preset speed adjustment value; Obtaining a first measured pressure value in the flue of the gas water heater; Obtaining a correction value based on the first measured pressure value and the reference pressure value, using the correction value to correct the preset pressure threshold and the reference pressure value of the gas water heater, and storing the corrected preset pressure threshold and the reference pressure value; wherein the corrected preset pressure threshold includes a corrected first pressure threshold and a corrected second pressure threshold, and the corrected second pressure threshold is greater than the corrected first pressure threshold; Obtaining a second measured pressure value in the flue of the gas water heater; When the second measured pressure value is greater than the corrected first pressure threshold, adjusting the air-fuel ratio in the combustion chamber of the gas water heater; Wherein, after the step of obtaining the second measured pressure value in the flue of the gas water heater, the method further includes: When the second measured pressure value is greater than the corrected first pressure threshold, obtaining a current second measured pressure value in the flue of the gas water heater; When the current second measured pressure value is greater than or equal to the corrected second pressure threshold, shutting down the gas water heater and / or outputting an alarm message indicating an abnormal pressure value; When the current second measured pressure value is less than the corrected second pressure threshold, the step of adjusting the air-fuel ratio in the combustion chamber of the gas water heater is executed; wherein, the step of adjusting the air-fuel ratio in the combustion chamber of the gas water heater includes: increasing the speed adjustment value of the air intake fan of the gas water heater and reducing the opening adjustment value of the gas proportional valve of the gas water heater.

2. The method according to claim 1, wherein The step of obtaining a correction value according to the first measured pressure value and the reference pressure value comprises: A difference between the first measured pressure value and the reference pressure value is obtained, and the difference is used as the correction value.

3. The method according to claim 2, wherein The preset pressure threshold includes a first pressure threshold and a second pressure threshold, the first pressure threshold is less than the second pressure threshold, and the step of using the correction value to correct the preset pressure threshold and the reference pressure value of the gas water heater includes: Summing the correction value and the first pressure threshold to obtain the corrected first pressure threshold; Summing the correction value and the second pressure threshold to obtain the corrected second pressure threshold; The correction value is summed with the reference pressure value to obtain a corrected reference pressure value.

4. The method according to claim 3, wherein The step of increasing the speed adjustment value of the air inlet fan of the gas water heater includes: Obtaining a preset speed adjustment increment of the intake fan; The speed adjustment value of the intake fan is increased according to the preset speed adjustment increment.

5. The method according to claim 3, wherein The step of reducing the opening adjustment value of the gas proportional valve of the gas water heater comprises: Obtaining a preset opening adjustment increment of the gas proportional valve; The opening adjustment value of the gas proportional valve is reduced according to the preset opening adjustment increment.

6. The method according to claim 1, wherein The step of obtaining the speed adjustment value of the air inlet fan of the gas water heater includes: Obtaining the required hot water production rate of the gas water heater; The speed adjustment value of the air intake fan is obtained according to the required hot water production rate and the corresponding relationship between the preset required hot water production rate and the preset speed adjustment value.

7. A gas water heater control device, characterized in that: include: A memory, a processor, and a gas water heater control program stored in the memory and executable on the processor, wherein the gas water heater control program, when executed by the processor, implements the steps of the gas water heater control method according to any one of claims 1 to 6.

8. A gas water heater, characterized in that: The gas water heater includes: a memory, a processor, and a gas water heater control program stored in the memory and executable on the processor. When the gas water heater control program is executed by the processor, the steps of the gas water heater control method according to any one of claims 1 to 6 are implemented; or, the gas water heater includes the gas water heater control device according to claim 7.

9. A storage medium, characterized in that: A gas water heater control program is stored thereon, and when the gas water heater control program is executed by a processor, the steps of the gas water heater control method according to any one of claims 1 to 6 are implemented.

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