Control method, controller, gas water heating device and heat supply system

Abstract

The invention relates to the technical field of water heating, and particularly discloses a control method, a controller, a gas water heating device and a heat supply system.The method comprises the steps that S10, under the condition that a domestic water signal is received, the domestic water signal is sent to the controller; a flow adjusting device is controlled to adjust the flow of water which flows into the first pipeline and is distributed to an inlet of the indoor heating equipment and an inlet of the first flow channel, so that one part of water flows to the inlet of the indoor heating equipment, and the other part of water flows to the inlet of the first flow channel; s20, according to the outlet water temperature of the living water and the set temperature of the living water, a flow adjusting device is controlled to adjust the ratio of the flow of the water flowing into the first pipeline to the flow of the water flowing into the inlet of the indoor heating equipment to the flow of the water flowing into the inlet of the first flow channel; and the outlet water temperature of the living water is the temperature of water flowing out of the outlet of the second flow channel. According to the scheme, the risk of overtemperature of the outlet domestic water and the fluctuation of the outlet domestic water temperature can be effectively reduced, and the constant-temperature experience of a user is improved.

Description

Technical Field

[0001] This specification relates to the field of water heating technology, and in particular to a control method, a controller, a gas water heater and a heating system. Background Art

[0002] Gas wall-mounted boilers provide both heating and domestic hot water. In heating mode, the hot water in the boiler flows to indoor heating equipment for heating. When hot water is needed, the hot water flows to the heat exchanger, which exchanges heat with domestic water to produce domestic hot water.

[0003] However, since the heating circulating water temperature is relatively high (e.g., 80 degrees Celsius) when the wall-mounted boiler is in heating mode, especially when the radiator is in heating mode, when a domestic water supply signal is received, the three-way valve is usually switched directly from the heating side to the domestic water side. As the higher-temperature circulating water in the pipeline enters the heat exchanger for heat exchange with the domestic water, the domestic water outlet temperature often exceeds the set temperature, resulting in a poor water experience for users.

[0004] To address the above issues, no effective solutions have been proposed so far. Summary of the Invention

[0005] The embodiments of this specification provide a control method, a controller, a gas water heater, and a heating system to solve the problem in the prior art of excessive domestic water outlet temperature after receiving a domestic water use signal in a heating state.

[0006] The embodiment of the present specification provides a control method for a gas water heater, wherein the gas water heater comprises: a first heat exchanger; a burner, wherein the burner is used to heat the first heat exchanger; a first pipe and a second pipe, wherein the first pipe is used to allow at least part of the water flowing out of the water outlet of the first heat exchanger to flow to the indoor heating equipment, and the second pipe is used to return the water flowing through the indoor heating equipment to the water inlet of the first heat exchanger; a second heat exchanger, wherein the second heat exchanger has a first flow channel and a second flow channel isolated from each other, the inlet of the first flow channel can be connected to the first pipe so that at least part of the water in the first pipe can flow into the inlet of the first flow channel, and the outlet of the first flow channel can be connected to the second pipe so that the water flowing out of the outlet of the first flow channel can flow a second pipe, the second pipe being used to circulate domestic water, and the water flowing through the first pipe and the water flowing through the second pipe being able to perform heat exchange; a flow regulating device, the flow regulating device being used to regulate the flow rate of the water flowing into the first pipe to be diverted to the inlet of the indoor heating equipment and the inlet of the first pipe; a circulating pump, the circulating pump being provided on the first pipe or the second pipe, the circulating pump being used to drive the water flowing from the outlet of the indoor heating equipment into the second pipe to flow through the first heat exchanger and then from the first pipe to the inlet of the indoor heating equipment, and the circulating pump being further used to drive the water flowing from the outlet of the first pipe into the second pipe to flow through the first heat exchanger and then from the first pipe to the inlet of the first pipe;

[0007] Wherein, the control method includes:

[0008] Step S10, when receiving a domestic water supply signal in the heating state, controlling the flow regulating device to regulate the flow of water flowing into the first pipeline to the inlet of the indoor heating device and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating device and the other part of the water flows to the inlet of the first flow channel;

[0009] Step S20, according to the domestic water outlet temperature and the domestic water set temperature, controls the flow regulating device to adjust the ratio between the flow of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel; the domestic water outlet temperature is the temperature of water flowing out of the outlet of the second flow channel.

[0010] In one embodiment, in step S10, the flow rate of the portion of water flowing to the inlet of the indoor heating device is greater than the flow rate of the other portion of water flowing to the inlet of the first flow channel, and the flow rate of the other portion of water is a preset flow rate; or

[0011] The step S10 specifically includes:

[0012] According to the temperature difference between the heating water outlet temperature and the set temperature of domestic water and / or the domestic water flow rate at the inlet of the second flow channel, the flow regulating device is controlled to adjust the flow rate of water flowing into the first pipeline to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel; the flow rate of the other part of water flowing to the inlet of the first flow channel is negatively correlated with the temperature difference, and / or the flow rate of the other part of water flowing to the inlet of the first flow channel is positively correlated with the domestic water flow rate; the heating water outlet temperature is the temperature of the water flowing out of the outlet of the first heat exchanger.

[0013] In one embodiment, step S10 specifically includes:

[0014] When receiving a domestic water use signal in the heating state, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference; the heating water outlet temperature is the temperature of water flowing out of the water outlet of the first heat exchanger; and the first preset temperature difference is greater than zero;

[0015] When it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is greater than the first preset temperature difference, the flow regulating device is controlled to adjust the flow rate of the water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel.

[0016] In one embodiment, step S10 specifically includes:

[0017] When receiving a domestic water use signal in the heating state, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference; the heating water outlet temperature is the temperature of water flowing out of the water outlet of the first heat exchanger; and the first preset temperature difference is greater than zero;

[0018] When it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is greater than the first preset temperature difference, the burner is controlled to stop burning or maintain the stopped burning state; the flow regulating device is controlled to adjust the flow rate of the water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel.

[0019] In one embodiment, after determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference, the method further includes:

[0020] Step S30, when it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is not greater than the first preset temperature difference, the burner is controlled to start combustion or maintain the combustion state, and the flow regulating device is controlled to regulate the flow of water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that all the water flowing into the first pipeline flows to the inlet of the first flow channel.

[0021] In one embodiment, after step S30, the method further includes:

[0022] The target power of the gas water heater is determined according to the current required load, and the burner is controlled to burn according to the target power to heat the first heat exchanger.

[0023] In one embodiment, after step S20, the method further includes:

[0024] Determine whether the duration of domestic water use has reached the preset duration;

[0025] If it is determined that the domestic water usage time has not reached the preset time, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a second preset temperature difference; the second preset temperature difference is greater than zero;

[0026] If it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is greater than the second preset temperature difference, the process returns to step S20.

[0027] In one embodiment, the method further comprises:

[0028] Step S40, when it is determined that the usage time of domestic water reaches a preset time or when it is determined that the temperature difference between the heating water outlet temperature and the domestic water set temperature is not greater than a second preset temperature difference, the flow regulating device is controlled to adjust the flow rate of the water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that all the water flowing into the first pipeline flows to the inlet of the first flow channel.

[0029] In one embodiment, after step S40, the method further includes:

[0030] Step S50 , controlling the circulation pump to start or stop according to the outlet temperature of the domestic water and the set temperature of the domestic water, so that the outlet temperature of the domestic water is close to the set temperature of the domestic water.

[0031] In one embodiment, step S50 specifically includes:

[0032] When the outlet temperature of the domestic water is higher than the set temperature of the domestic water, controlling the circulation pump to stop working;

[0033] When the outlet temperature of the domestic water is not higher than the set temperature of the domestic water, the circulation pump is controlled to start working.

[0034] In one embodiment, step S50 specifically includes:

[0035] When the outlet temperature of the domestic water is higher than the set temperature of the domestic water and the temperature difference between the two is greater than a first difference value, controlling the circulation pump to stop working for a first preset time period;

[0036] When the set domestic water temperature is higher than the domestic water outlet temperature and the temperature difference between the two is greater than a second difference, the circulation pump is controlled to start and continue to work for a second preset time period.

[0037] In one embodiment, after step S40 or step S50, the method further includes:

[0038] determining whether an ignition condition is met based on the heating water outlet temperature, the set domestic water temperature, and the domestic water flow rate at the inlet of the second flow channel;

[0039] When it is determined that the ignition condition is met, controlling the burner to start combustion;

[0040] The target power of the gas water heater is determined according to the current required load, and the burner is controlled to burn according to the target power to heat the first heat exchanger.

[0041] In one embodiment, step S10 specifically includes:

[0042] When receiving a domestic water use signal in the heating state, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference; the heating water outlet temperature is the temperature of water flowing out of the water outlet of the first heat exchanger; and the first preset temperature difference is greater than zero;

[0043] When it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is greater than the first preset temperature difference, the burner is controlled to burn according to the minimum power; the flow regulating device is controlled to adjust the flow rate of the water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel.

[0044] In one embodiment, step S20 specifically includes:

[0045] The burner is controlled to burn according to the temperature difference between the heating water outlet temperature and the domestic water set temperature, so that the temperature difference between the heating water outlet temperature and the domestic water set temperature is close to a second preset temperature difference; according to the domestic water outlet temperature and the domestic water set temperature, the flow regulating device is controlled to adjust the ratio between the flow rate of the water flowing into the first pipeline to the inlet of the indoor heating equipment and the flow rate diverted to the inlet of the first flow channel, until all the water flowing into the first pipeline flows to the inlet of the first flow channel.

[0046] In one embodiment, after step S20, the method further includes:

[0047] The target power of the gas water heater is determined according to the current required load, and the burner is controlled to burn according to the target power to heat the first heat exchanger.

[0048] In one embodiment, step S20 specifically includes:

[0049] When the outlet temperature of the domestic water is higher than the set domestic water temperature, controlling the flow regulating device to adjust the ratio between the flow rate of the water flowing into the first pipe diverted to the inlet of the indoor heating device and the flow rate diverted to the inlet of the first flow channel, so that the flow rate diverted to the inlet of the first flow channel is reduced;

[0050] When the outlet temperature of the domestic water is lower than the set temperature of the domestic water, the flow regulating device is controlled to adjust the ratio between the flow of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow diverted to the inlet of the first flow channel increases.

[0051] In one embodiment, step S20 specifically includes:

[0052] Determining whether the outlet temperature of the domestic water is greater than the sum of the set domestic water temperature and a third preset temperature difference; the third preset temperature difference is greater than zero;

[0053] When it is determined that the outlet temperature of the domestic water is greater than the sum of the set temperature of the domestic water and the third preset temperature difference, the flow regulating device is controlled to adjust the ratio between the flow of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow to the inlet of the first flow channel is reduced.

[0054] In one embodiment, after determining whether the outlet temperature of the domestic water is greater than the sum of the set domestic water temperature and a third preset temperature difference, the method further includes:

[0055] If it is determined that the outlet temperature of the domestic water is not greater than the sum of the set temperature of the domestic water and the third preset temperature difference, determining whether the outlet temperature of the domestic water is greater than the sum of the set temperature of the domestic water and a fourth preset temperature difference; the fourth preset temperature difference is greater than zero and less than the third preset temperature difference;

[0056] When it is determined that the outlet temperature of the domestic water is greater than the sum of the set domestic water temperature and the fourth preset temperature difference, the flow regulating device is controlled to keep the ratio between the flow of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel unchanged, so that the flow to the inlet of the first flow channel remains unchanged.

[0057] In one embodiment, step S20 specifically includes:

[0058] Determining whether the outlet temperature of the domestic water is less than the difference between the set domestic water temperature and a fifth preset temperature difference; the fifth preset temperature difference is greater than zero;

[0059] When it is determined that the outlet temperature of the domestic water is less than the difference between the set temperature of the domestic water and the fifth preset temperature difference, the flow regulating device is controlled to adjust the ratio between the flow of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow to the inlet of the first flow channel increases by a first amplitude.

[0060] In one embodiment, after determining whether the outlet temperature of the domestic water is less than the difference between the set domestic water temperature and a fifth preset temperature difference, the method further includes:

[0061] If it is determined that the outlet temperature of the domestic water is not less than the difference between the set temperature of the domestic water and a fifth preset temperature difference, determining whether the outlet temperature of the domestic water is less than the set temperature of the domestic water;

[0062] When it is determined that the outlet temperature of the domestic water is lower than the set temperature of the domestic water, the flow regulating device is controlled to adjust the ratio between the flow of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow to the inlet of the first flow channel increases by a second amplitude, and the second amplitude is smaller than the first amplitude.

[0063] In one embodiment, after determining whether the outlet temperature of the domestic water is lower than the set domestic water temperature, the method further includes:

[0064] If it is determined that the outlet temperature of the domestic water is not less than the set temperature of the domestic water, determining whether the outlet temperature of the domestic water is less than the sum of the set temperature of the domestic water and a sixth preset temperature difference; the sixth preset temperature difference is greater than zero;

[0065] When it is determined that the outlet temperature of the domestic water is lower than the sum of the set temperature of the domestic water and the sixth preset temperature difference, the flow regulating device is controlled to adjust the ratio between the flow of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow to the inlet of the first flow channel increases by a third amplitude, and the third amplitude is smaller than the second amplitude.

[0066] In one embodiment, after controlling the burner to burn according to the target power to heat the first heat exchanger, the method further includes:

[0067] When the outlet heating water temperature is greater than the sum of the set domestic water temperature and a first preset temperature difference, the burner is controlled to stop combustion.

[0068] An embodiment of this specification also provides a controller, including a processor and a memory for storing processor-executable instructions, and when the processor executes the instructions, the steps of the gas water heater control method described in any of the above embodiments are implemented.

[0069] The present invention also provides a gas water heater, which includes:

[0070] The controller described in the above embodiment;

[0071] a first heat exchanger;

[0072] a burner, the burner being used to heat the first heat exchanger;

[0073] a first pipe and a second pipe, wherein the first pipe is used to allow at least part of the water flowing out of the water outlet of the first heat exchanger to flow to the indoor heating equipment, and the second pipe is used to return the water flowing through the indoor heating equipment to the water inlet of the first heat exchanger;

[0074] a second heat exchanger having a first flow channel and a second flow channel isolated from each other, wherein the inlet of the first flow channel can be communicated with the first pipeline so that at least part of the water in the first pipeline can flow into the inlet of the first flow channel, and the outlet of the first flow channel can be communicated with the second pipeline so that water flowing out of the outlet of the first flow channel can flow into the second pipeline, and the second flow channel is used to circulate domestic water, and water flowing through the first flow channel and water flowing through the second flow channel can exchange heat;

[0075] a flow regulating device for regulating the flow of water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel;

[0076] A circulating pump is provided on the first pipeline or the second pipeline. The circulating pump can be used to drive the water flowing from the outlet of the indoor heating equipment into the second pipeline to flow through the first heat exchanger and then flow from the first pipeline to the inlet of the indoor heating equipment. The circulating pump is also used to drive the water flowing from the outlet of the first flow channel into the second pipeline to flow through the first heat exchanger and then flow from the first pipeline to the inlet of the first flow channel.

[0077] In one embodiment, the flow regulating device comprises a three-way valve;

[0078] The first port of the three-way valve is connected to the first pipeline, the second port of the three-way valve is connected to the inlet of the first flow channel, and the third port of the three-way valve is connected to the inlet of the indoor heating equipment;

[0079] or,

[0080] The first port of the three-way valve is communicated with the second pipeline, the second port of the three-way valve is communicated with the outlet of the first flow channel, and the third port of the three-way valve is communicated with the outlet of the indoor heating equipment.

[0081] In one embodiment, the gas water heater further comprises: a first connecting pipe, the first connecting pipe being used to connect the first pipe and the inlet of the first flow channel; a second connecting pipe, the second connecting pipe being used to connect the second pipe and the outlet of the first flow channel;

[0082] The flow regulating device comprises:

[0083] a first valve, the first valve being disposed on the first communicating pipe or the second communicating pipe to regulate a flow of water flowing into or out of the first flow channel;

[0084] The second valve is arranged on the first pipeline between the first connecting part between the first pipeline and the first connecting pipeline and the inlet of the indoor heating equipment to regulate the water flow flowing into the indoor heating equipment; or the second valve is arranged on the second pipeline between the second connecting part between the second pipeline and the second connecting pipeline and the outlet of the indoor heating equipment to regulate the water flow out of the indoor heating equipment.

[0085] In one embodiment, the gas water heater further comprises:

[0086] a first temperature sensor, the first temperature sensor being used to detect a heating water outlet temperature, the heating water outlet temperature being a temperature of water flowing out of an outlet of the first heat exchanger;

[0087] The second temperature sensor is used to detect the outlet temperature of domestic water, which is the temperature of water flowing out of the outlet of the second flow channel of the second heat exchanger.

[0088] The embodiment of this specification also provides a heating system, including:

[0089] The gas water heater as described in any of the above embodiments;

[0090] Indoor heating equipment, the inlet of the indoor heating equipment is connected to the water outlet of the first heat exchanger through a first pipeline, and the outlet of the indoor heating equipment is connected to the water inlet of the first heat exchanger through a second pipeline.

[0091] The technical solution of this specification has the following significant beneficial effects:

[0092] In the gas water heater control method of the embodiment of this specification, the working state of the gas water heater may include a heating state and a domestic hot water state. In the heating state, the water flowing out of the outlet of the first heat exchanger heated by the burner flows into the first pipeline, and all the water flowing into the first pipeline flows into the indoor heating equipment for heating. In the domestic hot water state, the water flowing out of the outlet of the first heat exchanger heated by the burner flows into the first pipeline, and at least part of the water flowing into the first pipeline flows into the first flow channel of the second heat exchanger to exchange heat with the domestic water in the second flow channel to provide domestic hot water. In the heating state, if a user water use signal is received, the flow regulating device is controlled to regulate the flow of water flowing into the first pipeline to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel. Compared to the prior art, in which, upon receiving a domestic water signal in a heating state, the flow regulating device controls the water flowing into the first pipe so that all of it flows into the inlet of the indoor heating device, and all of it flows into the inlet of the first flow channel. In this embodiment, the flow regulating device controls the water flowing into the first pipe so that it flows to the inlet of the indoor heating device and the inlet of the first flow channel, so that part of the water flows to the indoor heating device and the other part flows to the inlet of the first flow channel. This reduces the flow of hot water flowing into the inlet of the first flow channel, thereby reducing the amount of heat exchange between the hot water in the first flow channel and the domestic water in the second flow channel, lowering the temperature of the domestic water flowing out of the outlet of the second flow channel, and preventing the domestic water from overheating at the outlet of the second flow channel, thereby reducing the risk of scalding to the user and improving the user experience. Furthermore, after controlling part of the water flowing into the first pipe to flow to the inlet of the indoor heating device and the other part to flow to the inlet of the first flow channel, the flow regulating device can adjust the ratio between the flow of water flowing into the first pipe that flows to the inlet of the indoor heating device and the flow that flows to the inlet of the first flow channel, based on the domestic water outlet temperature and the domestic water set temperature. That is, the flow regulating device is subsequently controlled according to the temperature difference between the domestic water outlet temperature and the domestic water set temperature to adjust the ratio between the flow rate of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow rate diverted to the inlet of the first flow channel, so that the temperature of the domestic water flowing out of the outlet of the second flow channel is close to the domestic water set temperature.In the above manner, when a domestic water supply signal is received in the heating state, the heating water circuit (including the water circuit flowing to the inlet of the indoor heating equipment) is not immediately cut off. Instead, a preliminary diversion is performed first. By controlling the flow regulating device, the high-temperature water flowing out of the outlet of the first heat exchanger flows simultaneously to the indoor heating equipment and the first flow channel of the second heat exchanger. The preliminary diversion reduces the amount of water entering the first flow channel of the second heat exchanger, reducing heat input at the source, so that only a portion of the water flows into the first flow channel of the second heat exchanger to exchange heat with the domestic water flowing into the second flow channel of the second heat exchanger. This can avoid an instantaneous surge in the outlet temperature of the domestic water flowing out of the second flow channel of the second heat exchanger and severe overheating. Moreover, in the preliminary diversion state, the heating water circuit is not completely cut off, and high-temperature water still flows through the indoor heating equipment, avoiding a sudden drop in indoor temperature and having a relatively small impact on heating comfort. Afterwards, dynamic proportional adjustment is performed. Based on the domestic water outlet temperature and the domestic water set temperature, the flow control device fine-tunes the ratio of water flow diverted to the indoor heating equipment inlet and the inlet of the first flow channel. By adjusting this ratio, the amount of hot water entering the first flow channel of the second heat exchanger is controlled, thereby precisely controlling the heat exchange capacity of the second heat exchanger, ultimately stabilizing the domestic water outlet temperature near the domestic water set temperature. This reduces the volatility of the domestic water outlet temperature, improves the user's constant temperature experience, ensures water safety, and reduces the impact of domestic water use on indoor heating comfort, thus balancing the stability and comfort of the heating system.

[0093] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating how the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby. Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0094] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, parts, steps or components, but does not exclude the presence or addition of one or more other features, parts, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help understand the present invention. They do not specifically limit the shapes and proportional dimensions of the components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the specific circumstances under the guidance of the present invention. In the drawings:

[0096] Figure 1It shows a schematic structural diagram of a gas water heater in one embodiment of this specification;

[0097] Figure 2 It shows a schematic structural diagram of a gas water heater in one embodiment of this specification;

[0098] Figure 3 It shows a schematic structural diagram of a gas water heater in one embodiment of this specification;

[0099] Figure 4 A flow chart showing a method for controlling a gas water heater in an embodiment of this specification is shown;

[0100] Figure 5 A flow chart showing a method for controlling a gas water heater in an embodiment of this specification is shown;

[0101] Figure 6 A flow chart showing a method for controlling a gas water heater in an embodiment of this specification is shown;

[0102] Figure 7 A flow chart of a method for controlling a gas water heater in an embodiment of the present specification is shown.

[0103] Reference numerals in the above drawings:

[0104] 10. Gas water heater; 101. First heat exchanger; 102. Burner; 103. First pipeline; 104. Second pipeline; 105. Second heat exchanger; 106. Flow control device; 107. Circulation pump; 108. First temperature sensor; 109. Second temperature sensor; 151. First flow channel; 152. Second flow channel; 153. First connecting pipeline; 154. Second connecting pipeline; 161. First three-way valve; 162. Second three-way valve; 163. First valve; 164. Second valve;

[0105] 20. Indoor heating equipment; 30. Domestic water supply equipment. DETAILED DESCRIPTION

[0106] The principles and spirit of this specification will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided solely to enable those skilled in the art to better understand and implement this specification, and are not intended to limit the scope of this specification in any way. Rather, these embodiments are provided to make this specification more thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art.

[0107] Those skilled in the art will appreciate that the embodiments of this specification may be implemented as a system, device, method, or computer program product. Therefore, the disclosure herein may be implemented in the following forms: entirely in hardware, entirely in software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0108] The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are for illustrative purposes only and are not to be construed as limiting the present invention in any way. Based on the teachings of the present invention, skilled artisans can conceive of any possible variations based on the present invention, all of which should be considered within the scope of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, internal communication between two elements, direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0109] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this specification pertains. The terms used herein in this specification are for the purpose of describing specific embodiments only and are not intended to limit this specification. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0110] The embodiments of this specification provide a method for controlling a gas water heater. Figures 1 to 3 FIG1 shows a schematic diagram of the structure of a gas water heater in one embodiment of this specification. Figures 1 to 3 As shown, the gas water heater 10 includes: a first heat exchanger 101 , a burner 102 , a first pipeline 103 and a second pipeline 104 , a second heat exchanger 105 , a flow regulating device 106 and a circulation pump 107 .

[0111] Burner 102 is used for gas combustion. In one embodiment, burner 102 can be positioned opposite first heat exchanger 101 and can supply heat to first heat exchanger 101. Burner 102 can be in either a burning or off state. In the burning state, it heats first heat exchanger 101. With the heat supplied by burner 102, first heat exchanger 101 heats water flowing through it, producing hot water that meets demand.

[0112] The first pipeline 103 and the second pipeline 104 are pipelines within the gas water heater 10. The first pipeline 103 is used to direct at least a portion of the water flowing out of the water outlet of the first heat exchanger 101 to the indoor heating device 20. At least a portion of the water flowing out of the water outlet of the first heat exchanger 101 is transported to the indoor heating device 20 via the first pipeline 103 and indoor piping. The second pipeline 104 is used to return the water flowing through the indoor heating device 20 to the water inlet of the first heat exchanger 101. The water flowing through the indoor heating device 20 returns to the water inlet of the first heat exchanger 101 via the indoor piping and the second pipeline 104. At least a portion of the water flowing out of the water outlet of the first heat exchanger 101 flows through the first pipeline 103 and indoor piping into the indoor heating device 20, and then flows back to the first heat exchanger 101 via the indoor piping and the second pipeline 104 to meet the user's indoor heating needs.

[0113] The second heat exchanger 105 has a first flow channel 151 and a second flow channel 152 that are isolated from each other. The inlet of the first flow channel 151 can be connected to the first pipeline 103 so that at least part of the water in the first pipeline 103 can flow into the inlet of the first flow channel 151. The outlet of the first flow channel 151 can be connected to the second pipeline 104 so that the water flowing out of the outlet of the first flow channel 151 can flow into the second pipeline 104. The second flow channel 152 can be connected to the domestic water device 30 for circulating domestic water. The water flowing through the first flow channel 151 and the water flowing through the second flow channel 152 can exchange heat. By providing the second heat exchanger 105, the gas water heater 10 can heat domestic water to meet the user's hot water needs.

[0114] The flow regulating device 106 is used to divert the water flowing into the first pipe 103 to the inlet of the indoor heating device 20 and / or the inlet of the first flow channel 151. The flow regulating device 106 can adjust the flow rate of the water flowing into the first pipe 103 to the indoor heating device 20 and to the first flow channel 151. The adjustment here can include gradually increasing or decreasing the flow rate.

[0115] The circulation pump 107 can be installed on the first pipeline 103 or the second pipeline 104. The circulation pump 107 can be used to drive the water flowing from the outlet of the indoor heating device 20 into the second pipeline 104 to flow through the first heat exchanger 101 and then flow from the first pipeline 103 to the inlet of the indoor heating device 20. The circulation pump 107 can also be used to drive the water flowing from the outlet of the first flow channel 151 into the second pipeline 104 to flow through the first heat exchanger 101 and then flow from the first pipeline 103 to the inlet of the first flow channel 151. For example, Figures 1 to 3 As shown, the circulation pump 107 can be arranged on the second pipeline 104 .

[0116] like Figure 1 and Figure 2 As shown, in some embodiments of the present specification, the flow regulating device 106 may include a three-way valve.

[0117] like Figure 1 As shown, in some embodiments of this specification, the first port of the first three-way valve 161 is connected to the first pipeline 103, the second port of the first three-way valve 161 is connected to the inlet of the first flow channel 151, and the third port of the first three-way valve 161 is connected to the inlet of the indoor heating equipment 20.

[0118] like Figure 2 As shown, in some embodiments of this specification, the first port of the second three-way valve 162 is connected to the second pipeline 104, the second port of the second three-way valve 162 is connected to the outlet of the first flow channel 151, and the third port of the second three-way valve 162 is connected to the outlet of the indoor heating equipment 20.

[0119] like Figures 1 to 3 As shown, in some embodiments of this specification, the gas water heater 10 may further include: a first connecting pipe 153 and a second connecting pipe 154. The first connecting pipe 153 is used to connect the first pipe 103 and the inlet of the first flow channel 151. The second connecting pipe 154 is used to connect the second pipe 104 and the outlet of the first flow channel 151.

[0120] like Figure 3 As shown, in some embodiments of this specification, the flow regulating device 106 may include a first valve 163 and a second valve 164. The first valve 163 may be disposed on the first connecting line 153 or the second connecting line 154 to regulate the flow of water into or out of the first flow channel 151. The regulation herein may include gradually increasing or decreasing the flow rate. In one embodiment, the first valve 163 may be a solenoid valve. By adjusting the first valve 163, the flow rate of water flowing into the first pipeline 103 and diverted to the first flow channel 151 can be adjusted.

[0121] In one embodiment, a second valve 164 is disposed on the first pipeline 103 between the first connection portion between the first pipeline 103 and the first connecting pipeline 153 and the inlet of the indoor heating device 20 to regulate the flow of water into the indoor heating device 20. In another embodiment, the second valve 164 is disposed on the second pipeline 104 between the second connection portion between the second pipeline 104 and the second connecting pipeline 154 and the outlet of the indoor heating device 20 to regulate the flow of water out of the indoor heating device 20. The regulation herein may include gradually increasing or decreasing the flow rate. By adjusting the second valve 164, the flow rate of water diverted from the first pipeline 103 to the indoor heating device 20 can be adjusted.

[0122] like Figure 3 As shown, the first valve 163 may be provided on the first communication line 153, and the second valve 164 may be provided on the first line 103 between the first communication portion and the inlet of the indoor heating device 20. In one embodiment, the second valve 164 may be a solenoid valve.

[0123] In some embodiments of this specification, the gas water heater 10 further includes a first temperature sensor 108 and a second temperature sensor 109. The first temperature sensor 108 is used to detect the outlet temperature of heating water, which is the temperature of water flowing out of the outlet of the first heat exchanger 101. The second temperature sensor 109 is used to detect the outlet temperature of domestic water, which is the temperature of water flowing out of the outlet of the second flow channel 152 of the second heat exchanger 105.

[0124] Figure 4 A flow chart of a gas water heater control method in one embodiment of this specification is shown. Although this specification provides method operation steps or device structures as shown in the following embodiments or drawings, more or fewer operation steps or module units may be included in the method or device based on routine or no creative work. In the steps or structures where there is no necessary causal relationship logically, the execution order of these steps or the module structure of the device is not limited to the execution order or module structure described in the embodiments of this specification and shown in the drawings. When the method or module structure is applied to an actual device or terminal product, it can be connected in accordance with the method or module structure shown in the embodiments or drawings for sequential execution or parallel execution (for example, in a parallel processor or multi-threaded processing environment, or even a distributed processing environment).

[0125] Specifically, if Figure 4 As shown, a gas water heater control method provided in one embodiment of this specification may include the following steps.

[0126] Step S10, when a domestic water use signal is received in the heating state, the flow regulating device is controlled to adjust the flow of water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel.

[0127] The control method in the embodiments of this specification can be applied to the above-mentioned gas water heater. The working state of the gas water heater may include a heating state and a domestic hot water state. In the heating state, the water flowing out of the outlet of the first heat exchanger heated by the burner flows into the first pipeline, and all the water flowing into the first pipeline flows into the indoor heating equipment for heating. In the domestic hot water state, the water flowing out of the outlet of the first heat exchanger heated by the burner flows into the first pipeline, and at least part of the water flowing into the first pipeline flows into the first flow channel of the second heat exchanger to exchange heat with the domestic water in the second flow channel to provide domestic hot water. In the heating state, if a user water use signal is received, the flow regulating device is controlled to regulate the flow of water flowing into the first pipeline to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel.

[0128] When a domestic water use signal is received in the heating state, compared to the prior art in which the flow regulating device is controlled to regulate the water flowing into the first pipe to flow entirely into the inlet of the first flow channel, the flow regulating device in the embodiment of this specification regulates the water flowing into the first pipe to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel, thereby reducing the flow of hot water flowing into the inlet of the first flow channel, thereby reducing the amount of heat exchange between the hot water in the first flow channel and the domestic water in the second flow channel, reducing the temperature of the domestic water flowing out of the outlet of the second flow channel, so that the temperature of the domestic water flowing out of the outlet of the second flow channel will not be overheated, reducing the risk of scalding to the user, and improving the user experience.

[0129] When a domestic water use signal is received in the heating state, the heating water line is not immediately cut off (the heating water line includes the water line flowing to the inlet of the indoor heating equipment). Instead, a preliminary diversion is performed first. By controlling the flow regulating device, the high-temperature water flowing out of the outlet of the first heat exchanger flows to the indoor heating equipment and the first flow channel of the second heat exchanger at the same time. The amount of water entering the first flow channel of the second heat exchanger is reduced through preliminary diversion, and the heat input is reduced from the source, so that only part of the water flows into the first flow channel of the second heat exchanger to exchange heat with the domestic water flowing into the second flow channel of the second heat exchanger. This can avoid an instantaneous surge in the outlet temperature of the domestic water flowing out of the second flow channel of the second heat exchanger and serious overheating.

[0130] Moreover, when the domestic water use signal is received in the heating state, preliminary diversion is performed, and the heating water line is not completely cut off. High-temperature water still flows through the indoor heating equipment, avoiding a sudden drop in indoor temperature and having relatively little impact on heating comfort.

[0131] Step S20, according to the domestic water outlet temperature and the domestic water set temperature, controls the flow regulating device to adjust the ratio between the flow of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel; the domestic water outlet temperature is the temperature of water flowing out of the outlet of the second flow channel.

[0132] After the initial diversion, dynamic proportional adjustment is performed. Specifically, after controlling a portion of the water flowing into the first pipeline to flow to the inlet of the indoor heating device and another portion to flow to the inlet of the first flow channel, the flow regulating device can be controlled to adjust the ratio between the flow rate of the water flowing into the first pipeline diverted to the inlet of the indoor heating device and the flow rate diverted to the inlet of the first flow channel based on the domestic water outlet temperature and the domestic water set temperature.

[0133] That is, the flow regulating device is subsequently controlled according to the temperature difference between the domestic water outlet temperature and the domestic water set temperature to adjust the ratio between the flow rate of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow rate diverted to the inlet of the first flow channel, so that the temperature of the domestic water flowing out of the outlet of the second flow channel is close to the domestic water set temperature.

[0134] By adjusting the ratio between the flow rate of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow rate diverted to the inlet of the first flow channel, the amount of hot water entering the first flow channel of the second heat exchanger is controlled, and the heat exchange capacity of the second heat exchanger is precisely controlled, and ultimately the outlet temperature of the domestic water is stabilized near the set temperature of the domestic water.

[0135] The gas water heater in the above embodiment can reduce the fluctuation of the outlet temperature of domestic water, improve the user's constant temperature experience, ensure the user's water safety, and at the same time reduce the impact of domestic water use on the comfort of indoor heating, taking into account the stability and comfort of the heating system.

[0136] In some embodiments of the present specification, in step S10, the flow rate of the portion of water flowing to the inlet of the indoor heating equipment is greater than the flow rate of the other portion of water flowing to the inlet of the first flow channel, and the flow rate of the other portion of water is a preset flow rate.

[0137] In this embodiment, when performing preliminary diversion, the flow regulating device can be controlled so that the flow rate of the water flowing into the first pipeline to the inlet of the first flow channel is less than the flow rate diverted to the inlet of the indoor heating equipment. That is, when performing preliminary diversion, the flow regulating device is controlled so that a small amount of water flows into the inlet of the first flow channel. The flow rate of water flowing into the inlet of the first flow channel can be a preset flow rate. The preset flow rate here can be set based on experience. The preset flow rate is usually set based on a safety threshold value (empirical value) to ensure that domestic water will not overheat even under high water temperature conditions. By setting the flow rate flowing into the inlet of the first flow channel during initial diversion to the preset flow rate, it can be further ensured that domestic water will not overheat, ensuring the safety of users' water use.

[0138] In some embodiments of the present specification, the flow regulating device may include a three-way valve. In one embodiment, a stepper motor can be used to drive the three-way valve to adjust the flow diverted to the indoor heating equipment and the first flow channel. When performing preliminary diversion, the stepper motor can be controlled to move a preset number of steps, thereby driving the three-way valve to move, so that a small amount of water flows into the inlet of the first flow channel. At this time, the water flow rate flowing into the inlet of the first flow channel is very small. Preliminary diversion is equivalent to giving the three-way valve a starting value so that part of the water flowing into the first pipeline can quickly flow into the inlet of the first flow channel. In this embodiment, the preset flow rate can correspond to the preset number of steps of the initial movement. In one embodiment, the preset number of steps is 20 steps, 30 steps or 50 steps, etc. The preset number of steps can be set according to actual conditions.

[0139] In some embodiments of the present specification, the step S10 specifically includes: according to the temperature difference between the heating water outlet temperature and the set temperature of domestic water and / or the domestic water flow rate at the inlet of the second flow channel, controlling the flow regulating device to adjust the water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the flow rate of water at the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment, and the other part of the water flows to the inlet of the first flow channel; the flow rate of the other part of the water flowing to the inlet of the first flow channel is negatively correlated with the temperature difference, and / or the flow rate of the other part of the water flowing to the inlet of the first flow channel is positively correlated with the domestic water flow rate; the heating water outlet temperature is the temperature of the water flowing out of the outlet of the first heat exchanger.

[0140] In this embodiment, the initial flow rate of water diverted to the inlet of the first flow channel can be determined based on the temperature difference between the heating water outlet temperature and the set temperature of the domestic water and / or the domestic water flow rate at the inlet of the second flow channel. Subsequently, the flow rate regulating device can be controlled to adjust the flow rate of water diverted from the first pipeline to the inlet of the first flow channel to the initial flow rate. In other words, in this embodiment, the initial flow rate of water diverted to the inlet of the first flow channel during the initial diversion can be determined based on the temperature difference between the heating water outlet temperature and the set temperature of the domestic water and / or the domestic water flow rate at the inlet of the second flow channel.

[0141] In one embodiment, the initial flow rate can be determined based on the temperature difference between the heating water outlet temperature and the set domestic water temperature. The heating water outlet temperature is higher than the set domestic water temperature. A greater temperature difference indicates a higher heating water outlet temperature. To prevent overheating, a small amount of high-temperature water can be allowed to flow into the inlet of the first flow channel. Specifically, a greater temperature difference between the heating water outlet temperature and the set domestic water temperature indicates a smaller initial flow rate, and the two are negatively correlated.

[0142] In another embodiment, the initial flow rate of water diverted to the inlet of the first flow channel during the initial diversion can be determined based on the flow rate of domestic water flowing into the inlet of the second flow channel. A greater flow rate of domestic water flowing into the inlet of the second flow channel indicates a greater heat requirement for the domestic water. To ensure that the outlet temperature of the domestic water approaches the set domestic water temperature, a slightly greater amount of high-temperature water can be allowed to flow into the inlet of the first flow channel. Specifically, a greater flow rate of domestic water flowing into the inlet of the second flow channel indicates a greater initial flow rate, and the two are positively correlated.

[0143] In yet another embodiment, the initial flow rate of water diverted to the inlet of the first flow channel during the initial diversion can be determined by combining the temperature difference between the heating water outlet temperature and the set temperature of the domestic water and the flow rate of domestic water flowing into the inlet of the second flow channel. For example, if the temperature difference between the heating water outlet temperature and the set temperature of the domestic water is large and the flow rate of domestic water flowing into the inlet of the second flow channel is small, a very low initial flow rate can be set. For another example, if the temperature difference between the heating water outlet temperature and the set temperature of the domestic water is small and the flow rate of domestic water flowing into the inlet of the second flow channel is large, a higher initial flow rate can be set.

[0144] In some embodiments of the present specification, the step S10 specifically includes: when a domestic water use signal is received in the heating state, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference; the heating water outlet temperature is the temperature of water flowing out of the outlet of the first heat exchanger; the first preset temperature difference is greater than zero; when it is determined that the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than the first preset temperature difference, controlling the flow regulating device to adjust the flow of water flowing into the first pipeline to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment, and the other part of the water flows to the inlet of the first flow channel.

[0145] In this embodiment, when a domestic water use signal is received in the heating state, it can be first determined whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than the first preset temperature difference. The first preset temperature difference can be set according to actual conditions. In one embodiment, the first preset temperature difference can be set to 10°C to 20°C, for example, it can be set to 15°C. When the temperature difference between the heating water outlet temperature and the domestic water set temperature is large, that is, when the heating water outlet temperature is high, preliminary diversion is performed to control the flow regulating device to adjust the flow of water flowing into the first pipeline to the inlet of the indoor heating equipment and the inlet of the first flow channel. In this embodiment, high temperature scenes can be identified by judging the temperature difference threshold, and preliminary diversion is performed only when the temperature is high, forming an intelligent diversion mechanism that is activated on demand, taking into account both safety and economy.

[0146] In some embodiments of the present specification, the step S10 specifically includes: when a domestic water use signal is received in the heating state, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference; the heating water outlet temperature is the temperature of water flowing out of the outlet of the first heat exchanger; the first preset temperature difference is greater than zero; when it is determined that the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than the first preset temperature difference, controlling the burner to stop burning or maintain a stopped burning state; controlling the flow regulating device to regulate the flow of water flowing into the first pipeline to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment, and the other part of the water flows to the inlet of the first flow channel.

[0147] In this embodiment, when a domestic water signal is received in the heating state, it can be first determined whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference. In one embodiment, the first preset temperature difference can be set to 10°C to 20°C, for example, it can be set to 15°C. When the temperature difference between the heating water outlet temperature and the domestic water set temperature is large, that is, when the heating water outlet temperature is high, the burner is controlled to stop burning or maintain a state of stopping burning, and a preliminary diversion is performed to control the flow regulating device to adjust the flow of water flowing into the first pipeline to the inlet of the indoor heating equipment and the inlet of the first flow channel. In this embodiment, high temperature scenes can be identified by judging the temperature difference threshold. In high temperature scenes, in order to avoid overheating of domestic water, on the one hand, the burner is controlled to be extinguished or maintained in an extinguished state, and on the other hand, preliminary diversion is performed. Through the coordinated control of heat source-diversion, the risk of overheating is reduced to almost zero.

[0148] In some embodiments of the present specification, after determining whether the temperature difference between the heating water outlet temperature and the living water set temperature is greater than a first preset temperature difference, the method further includes: step S30, when it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is not greater than the first preset temperature difference, controlling the burner to start combustion or maintain the combustion state, and controlling the flow regulating device to regulate the flow of water flowing into the first pipeline to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that all the water flowing into the first pipeline flows to the inlet of the first flow channel.

[0149] In this embodiment, after determining whether the temperature difference between the heating water outlet temperature and the set domestic water temperature is greater than a first preset temperature difference, if the temperature difference between the two is not greater than the first preset temperature difference, it indicates that the heating water temperature is not high and is unlikely to overheat. At this time, the burner is controlled to start combustion or maintain combustion, and the flow control device is controlled so that all water flowing into the first pipeline flows to the inlet of the first flow channel. When the temperature of the heating water flowing out of the outlet of the first heat exchanger is low, the burner is controlled to burn and the flow control device is controlled to fully cut to the inlet of the first flow channel. Due to the low heating water outlet temperature, overheating will not occur. Moreover, by burning the burner and fully cutting the flow control device, the temperature of the domestic water flowing out of the second flow channel can quickly reach the set domestic water temperature, reducing user waiting time and improving user experience.

[0150] In some embodiments of the present specification, after step S30, the method may further include: determining a target power of the gas water heater according to a current required load, and controlling combustion of the burner to heat the first heat exchanger according to the target power.

[0151] When the outlet water temperature is low, after controlling the burner and fully switching the flow control device to the inlet of the first flow channel, constant temperature regulation can be performed based on the current required load. Specifically, the target power of the gas water heater can be determined based on the current required load, and the burner can be controlled to heat the first heat exchanger based on the target power. The current required load refers to the heat load required to heat the domestic water flowing into the second flow channel to the set domestic water temperature. Performing constant temperature regulation after fully switching can quickly stabilize the domestic water outlet temperature near the set domestic water temperature, improving the user's water temperature control experience.

[0152] In some embodiments of the present specification, after step S20, the method may further include: determining whether the duration of use of domestic water reaches a preset duration; if it is determined that the duration of use of domestic water does not reach the preset duration, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a second preset temperature difference; the second preset temperature difference is greater than zero; if it is determined that the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than the second preset temperature difference, returning to step S20.

[0153] In this embodiment, when a domestic water signal is received during heating mode, a preliminary diversion is performed. Specifically, the flow control device is controlled to adjust the flow of heating water flowing into the first pipeline to the indoor heating equipment and the inlet of the first flow channel, so that only a portion of the water flows into the inlet of the first flow channel to exchange heat with the domestic water flowing into the second flow channel. The ratio of the water flow diverted to the indoor heating equipment and the water flow diverted to the inlet of the first flow channel can then be fine-tuned based on the domestic water outlet temperature and the domestic water set temperature. After fine-tuning, a determination is made as to whether the domestic water usage time has reached a preset duration. If not, a determination is made as to whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a second preset temperature difference. In one embodiment, the preset duration can be set between 40 and 80 seconds. For example, it can be set to 60 seconds. In one embodiment, the second preset temperature difference can be set between 8°C and 18°C. For example, it can be set to 12°C. If the temperature difference between the heating water outlet temperature and the domestic water set temperature is still large, it means that the heating water outlet temperature is still high, indicating that the cooling range is not enough to eliminate the risk of overheating, and fine-tuning can be continued, that is, it can return to step S20 to control the flow regulating device according to the domestic water outlet temperature and the domestic water set temperature. In the initial stage (the heating water outlet temperature and the domestic water set temperature are greater than the first preset temperature difference), the burner is in an extinguished state, and the high-temperature heating water is initially diverted to prevent overheating; and in the middle and late stages, due to the heat exchange with the domestic water, the heating water temperature naturally drops. At this time, it is necessary to determine whether the temperature of the heating water is still very high (whether the temperature difference is greater than the second preset temperature difference) and whether diversion is required to prevent overheating. If so, continue to fine-tune. In addition, considering that when the domestic water usage time does not reach the preset time, the water temperature drops less, the water temperature of the heating water is higher at this time, and it may be necessary to continue to fine-tune by diversion. Therefore, it is possible to determine whether the temperature difference is greater than the second preset temperature difference only when the domestic water is in use for a preset period of time, and then determine whether to continue fine-tuning based on the judgment result. In this way, if the outlet temperature of the heating water is high within the preset domestic water usage period, the flow control device can be controlled to continuously fine-tune the water flow diverted to the inlet of the first flow channel, thereby avoiding direct full diversion to the domestic water side and causing overheating.

[0154] In some embodiments of the present specification, the method may further include: step S40, when it is determined that the usage time of domestic water reaches a preset time or when it is determined that the temperature difference between the heating water outlet temperature and the domestic water set temperature is not greater than a second preset temperature difference, controlling the flow regulating device to adjust the flow rate of water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that all the water flowing into the first pipeline flows to the inlet of the first flow channel.

[0155] In one embodiment, if the domestic water usage duration reaches a preset time, indicating that the domestic water usage duration has been extended, the burner is extinguished and the heating water and domestic water continue to exchange heat, resulting in a low outlet temperature for the heating water. This essentially eliminates the risk of domestic water overheating, requiring all heat to be concentrated to maintain the domestic water temperature. Therefore, if the domestic water usage duration reaches a preset time, the system can be fully switched to the domestic water side. Specifically, the flow control device can be controlled so that all water flowing into the first pipeline flows to the inlet of the first flow channel to meet the domestic water heat demand.

[0156] In another embodiment, if the domestic water usage duration is within a preset duration and the temperature difference between the heating water outlet temperature and the domestic water set temperature is no greater than a second preset temperature difference, this indicates that the heating water outlet temperature is low and the domestic water is essentially not overheated. Instead, all heat must be concentrated to maintain the domestic water temperature. Therefore, if the domestic water usage duration has not reached the preset duration and the temperature difference between the heating water outlet temperature and the domestic water set temperature is no greater than the second preset temperature difference, the system can be fully switched to the domestic water side, that is, the flow control device can be controlled so that all water flowing into the first pipeline flows to the inlet of the first flow channel to meet the domestic water heat demand.

[0157] Through the above method, when the outlet heating water temperature is not high (the domestic water usage time reaches the preset time or the temperature difference between the outlet heating water temperature and the set domestic water temperature is not greater than the second preset temperature difference), the flow regulating device is controlled to fully switch to the domestic water side (that is, all the water flowing into the first pipeline flows to the inlet of the first flow channel). Heat can be concentrated to maintain the domestic water temperature, so that the outlet domestic water temperature is raised to close to the set domestic water temperature. In addition, when the outlet heating water temperature is not high, by fully switching to the domestic water side, the heating circuit can be cut off, preventing the lower heating water from flowing into the indoor heating equipment, causing the indoor temperature to drop and affecting the heating comfort.

[0158] In some embodiments of the present specification, after step S40, the method may further include: step S50, controlling the start or stop of the circulation pump according to the domestic water outlet temperature and the domestic water set temperature, so that the domestic water outlet temperature is close to the domestic water set temperature.

[0159] Specifically, after the system is fully switched to the domestic water side, the circulation pump can be started or stopped based on the domestic water outlet temperature and the domestic water set temperature, so that water flowing into the first pipeline flows into the first flow channel or does not flow into the first flow channel, thereby adjusting the water flow into the first pipeline so that the domestic water outlet temperature approaches the domestic water set temperature. After the system is fully switched to the domestic water side, the circulation pump can be started and stopped to control the flow rate, and further constant temperature regulation can be performed to keep the domestic water outlet temperature close to the domestic water set temperature, improving the user's water experience.

[0160] In some embodiments of this specification, step S50 may specifically include: controlling the circulation pump to stop operating if the outlet temperature of the domestic water is higher than the set temperature of the domestic water; and controlling the circulation pump to restart operating if the outlet temperature of the domestic water is not higher than the set temperature of the domestic water. In this embodiment, when the outlet temperature of the domestic water is higher than the set temperature of the domestic water, stopping the circulation pump is equivalent to cutting off the flow of heat source water, slowing or suspending heat exchange between the heating water in the first flow channel and the domestic water in the second flow channel. When the temperature falls below the set value, the circulation pump is restarted, allowing the heating water to flow through the first flow channel of the second heat exchanger again to heat the domestic water in the second flow channel.

[0161] In some embodiments of the present specification, the step S50 may specifically include: when the outlet temperature of the domestic water is higher than the set temperature of the domestic water and the temperature difference between the two is greater than a first difference, controlling the circulation pump to stop working for a first preset time; when the set temperature of the domestic water is higher than the outlet temperature of the domestic water and the temperature difference between the two is greater than a second difference, controlling the circulation pump to start working for a second preset time.

[0162] In this embodiment, when the outlet temperature of the domestic water is higher than the set temperature of the domestic water and the temperature difference between the two is greater than a first difference, the circulating pump is controlled to stop working for a first preset time. The first difference can be set to 1 degree Celsius to 3 degrees Celsius, for example, it can be set to 2 degrees Celsius. The first preset time can be set according to actual conditions, for example, it can be set to 3 seconds to 20 seconds, etc. After the circulating pump stops working for the first preset time, the outlet temperature of the domestic water drops to approach the set temperature of the domestic water. When the set temperature of the domestic water is higher than the outlet temperature of the domestic water and the temperature difference between the two is greater than a second difference, the circulating pump is controlled to start working for a second preset time. After the circulating pump is controlled to start working for the second preset time, the outlet temperature of the domestic water rises to approach the set temperature of the domestic water. In this way, while avoiding too frequent starting and stopping of the circulating pump, the volatility of the outlet temperature of the domestic water can be reduced, thereby improving the user's constant temperature experience.

[0163] In some embodiments of the present specification, after step S40 or step S50, the method may further include: judging whether the ignition condition is met based on the heating water outlet temperature, the domestic water set temperature and the domestic water flow rate at the inlet of the second flow channel; if it is determined that the ignition condition is met, controlling the burner to start combustion; determining the target power based on the current required load, and controlling the burner to burn according to the target power to heat the first heat exchanger.

[0164] After the flow regulating device is fully switched to the domestic water side, or after the circulation pump is started or stopped according to the domestic water outlet temperature and the domestic water set temperature so that the domestic water outlet temperature is close to the domestic water set temperature, it can be determined whether ignition is required. Specifically, whether the ignition conditions are met can be determined based on the heating water outlet temperature, the domestic water set temperature, and the domestic water flow rate at the inlet of the second flow channel. When the heating water outlet temperature is not sufficient to maintain the domestic water heated to the domestic water set temperature, it is determined that the ignition conditions are met. When the ignition conditions are met, the burner is controlled to start burning. Afterwards, constant temperature adjustment is performed according to the current required load. Specifically, the target power of the gas water heater can be determined according to the current required load, and the burner is controlled to burn according to the target power to heat the first heat exchanger. The current required load refers to the heat load required to heat the domestic water flowing into the second flow channel to the domestic water set temperature. In the above manner, when the heating water heat is not sufficient to meet the domestic hot water demand, the burner can be controlled to burn to meet the user's domestic hot water demand.

[0165] In some embodiments of the present specification, the step S10 may specifically include: when a domestic water use signal is received in the heating state, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference; the heating water outlet temperature is the temperature of water flowing out of the outlet of the first heat exchanger; the first preset temperature difference is greater than zero; when it is determined that the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than the first preset temperature difference, controlling the burner to burn according to the minimum power; controlling the flow regulating device to adjust the flow of water flowing into the first pipeline to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment, and the other part of the water flows to the inlet of the first flow channel.

[0166] In this embodiment, when a domestic water supply signal is received during heating mode, a determination can be made as to whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference. In one embodiment, the first preset temperature difference can be set between 10°C and 20°C, for example, 15°C. When the temperature difference between the heating water outlet temperature and the domestic water set temperature is large, i.e., when the heating water outlet temperature is high, the burner is controlled to operate at minimum power, and preliminary flow diversion is performed. The flow control device is controlled to adjust the flow rate of water flowing into the first pipeline to the inlet of the indoor heating device and the inlet of the first flow channel. The minimum power refers to the minimum power at which the gas water heater can start combustion. From a thermodynamic perspective, minimum power combustion acts as a thermal buffer, preventing the continuous generation of high-temperature water and preventing ignition delays caused by complete burner cooling. Rising from minimum power to target power is faster than a cold start, which is crucial for the water user experience. In this embodiment, high-temperature scenarios can be identified by determining the temperature difference threshold. In these high-temperature scenarios, to prevent domestic water from overheating, the burner is controlled at minimum power and preliminary flow diversion is performed. The coordinated control of heat source and diversion significantly reduces the risk of overheating. Furthermore, by controlling burner combustion based on minimum power rather than controlling burner flameout, repeated burner starts and stops can be avoided, thereby extending the service life of burner-related components. Furthermore, compared to the process from ignition to stable combustion, the gas water heater in the embodiments of this specification does not require ignition when going from minimum power to target power. This allows for faster combustion stabilization, improving both combustion response and stability, and enhancing the user experience.

[0167] In some embodiments of the present specification, after determining whether the temperature difference between the heating water outlet temperature and the living water set temperature is greater than a first preset temperature difference, it also includes: when it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is not greater than the first preset temperature difference, controlling the burner to start combustion or maintain the combustion state, and controlling the flow regulating device to regulate the flow of water flowing into the first pipeline to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that all the water flowing into the first pipeline flows to the inlet of the first flow channel.

[0168] In this embodiment, after determining whether the temperature difference between the heating water outlet temperature and the set domestic water temperature is greater than a first preset temperature difference, if the temperature difference between the two is not greater than the first preset temperature difference, it indicates that the heating water temperature is not high and is unlikely to overheat. At this time, the burner is controlled to start combustion or maintain combustion, and the flow control device is controlled so that all water flowing into the first pipeline flows to the inlet of the first flow channel. When the temperature of the heating water flowing out of the outlet of the first heat exchanger is low, the burner is controlled to burn and the flow control device is controlled to fully cut to the inlet of the first flow channel. Due to the low heating water outlet temperature, overheating will not occur. Moreover, by burning the burner and fully cutting the flow control device, the temperature of the domestic water flowing out of the second flow channel can quickly reach the set domestic water temperature, reducing user waiting time and improving user experience.

[0169] In some embodiments of the present specification, after controlling the flow regulating device to adjust the flow of water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that all the water flowing into the first pipeline flows to the inlet of the first flow channel, the method may also include: determining the target power of the gas water heater according to the current required load, and controlling the burner to burn according to the target power to heat the first heat exchanger.

[0170] When the heating water outlet temperature is low, after controlling the burner and fully switching the flow control device to the inlet of the first flow channel, constant temperature regulation can be performed based on the current required load. Specifically, the target power of the gas water heater can be determined based on the current required load, and the burner can be controlled to heat the first heat exchanger based on the target power. The current required load refers to the heat load required to heat the domestic water flowing into the second flow channel to the set domestic water temperature. Performing constant temperature regulation after fully switching can quickly stabilize the domestic water outlet temperature near the set domestic water temperature.

[0171] In some embodiments of the present specification, the step S20 may specifically include: controlling the combustion of the burner according to the temperature difference between the heating water outlet temperature and the domestic water set temperature, so that the temperature difference between the heating water outlet temperature and the domestic water set temperature is close to a second preset temperature difference; according to the domestic water outlet temperature and the domestic water set temperature, controlling the flow regulating device to adjust the ratio between the flow rate of the water flowing into the first pipeline to the inlet of the indoor heating equipment and the flow rate diverted to the inlet of the first flow channel, until all the water flowing into the first pipeline flows to the inlet of the first flow channel.

[0172] In this embodiment, when it is determined that the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than the first preset temperature difference, the burner is controlled to burn according to the minimum power and preliminary diversion is performed, and then the burner is controlled to burn according to the temperature difference between the heating water outlet temperature and the domestic water set temperature, so that the temperature difference between the heating water outlet temperature and the domestic water set temperature is close to the second preset temperature difference. The second preset temperature difference can be set to 8-18°C, for example, the second preset temperature difference can be set to 12°C. In one embodiment, if the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than the second preset temperature difference, it means that the heating water outlet temperature is high. At this time, the combustion power of the burner is controlled to be reduced to lower the heating water outlet temperature. If the temperature difference between the heating water outlet temperature and the domestic water set temperature is not greater than the second preset temperature difference, it means that the heating water outlet temperature is low. At this time, the combustion power of the control burner is increased to increase the heating water outlet temperature. While controlling the burner's combustion based on the temperature difference between the heating water outlet temperature and the set domestic water temperature, the flow control device is controlled to adjust the ratio between the flow rate of water flowing into the first pipe to the inlet of the indoor heating device and the flow rate diverted to the inlet of the first flow channel based on the domestic water outlet temperature and the set domestic water temperature. That is, while controlling the burner's combustion based on the temperature difference between the heating water outlet temperature and the set domestic water temperature, the water flow diverted to the first flow channel is dynamically proportionally adjusted based on the domestic water outlet temperature and the set domestic water temperature. Controlling the burner's combustion based on the temperature difference between the heating water outlet temperature and the set domestic water temperature is intended to maintain a higher heating water outlet temperature, sufficient to meet the user's hot water needs. At this point, the flow control device can be used to adjust the water flow rate flowing into the first flow channel to bring the domestic water outlet temperature close to the set domestic water temperature. The above steps are repeated until the entire flow is switched to the domestic water side, i.e., until all the water flowing into the first pipe flows to the inlet of the first flow channel. Through the above method, after receiving the domestic water use signal in the heating state, if the heating water outlet temperature is very high, the burner is controlled to burn and perform preliminary diversion according to the minimum power, and then the power of the burner is adjusted to make the heating water outlet temperature at a stable and higher level. At the same time, the water flow diverted to the first flow channel is dynamically adjusted according to the domestic water outlet temperature and the domestic water set temperature, so that the domestic water outlet temperature is stable near the domestic water set temperature until it is fully cut to the domestic water side, which can greatly reduce the volatility of the water outlet temperature and improve the user's constant temperature experience.

[0173] In some embodiments of the present specification, after step S20, the method may further include: determining a target power of the gas water heater according to a current required load, and controlling combustion of the burner to heat the first heat exchanger according to the target power.

[0174] After receiving the domestic water signal in the heating state, if the heating water outlet temperature is very high, the burner is controlled to burn according to the minimum power and preliminary diversion is performed. The power of the burner is then adjusted so that the heating water outlet temperature is at a stable and high level. At the same time, the water flow diverted to the first flow channel is dynamically adjusted according to the domestic water outlet temperature and the domestic water set temperature, so that the domestic water outlet temperature is stabilized near the domestic water set temperature until it is fully switched to the domestic water side. Afterwards, the target power of the gas water heater can be determined based on the current required load, and the burner can be controlled to burn according to the target power to heat the first heat exchanger for constant temperature regulation. Through the dynamic matching control of load demand and combustion power, the evolution of the gas water heater from a safe over-temperature prevention mode to an efficient constant temperature mode is achieved.

[0175] Next, the specific implementation of step S20 is described.

[0176] In some embodiments of the present specification, the step S20 may specifically include: when the outlet temperature of the domestic water is higher than the set temperature of the domestic water, controlling the flow regulating device to adjust the ratio between the flow of the water flowing into the first pipe diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow diverted to the inlet of the first flow channel is reduced; when the outlet temperature of the domestic water is lower than the set temperature of the domestic water, controlling the flow regulating device to adjust the ratio between the flow of the water flowing into the first pipe diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow diverted to the inlet of the first flow channel is increased.

[0177] In this embodiment, when the outlet temperature of domestic water is higher than the set temperature of domestic water, the flow regulating device can be controlled to adjust the ratio between the flow of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow diverted to the inlet of the first flow channel is reduced, thereby lowering the outlet temperature of domestic water, so that the outlet temperature of domestic water is close to the set temperature of domestic water.

[0178] When the outlet temperature of domestic water is lower than the set temperature of domestic water, the flow regulating device can be controlled to adjust the ratio of the flow of water flowing into the first pipeline to the inlet of the indoor heating equipment and the zero flow diverted to the inlet of the first flow, so that the flow diverted to the inlet of the first flow channel increases, thereby increasing the outlet temperature of domestic water and making the outlet temperature of domestic water close to the set temperature of domestic water.

[0179] In some embodiments of the present specification, the step S20 may specifically include: determining whether the outlet temperature of the domestic water is less than the difference between the set temperature of the domestic water and the fifth preset temperature difference; the fifth preset temperature difference is greater than zero; when it is determined that the outlet temperature of the domestic water is less than the difference between the set temperature of the domestic water and the fifth preset temperature difference, controlling the flow regulating device to adjust the ratio between the flow of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow to the inlet of the first flow channel increases by a first amplitude.

[0180] In this embodiment, when dynamically adjusting the water flow rate, it can be determined whether the temperature difference between the set domestic water temperature and the outlet domestic water temperature is less than a fifth preset temperature difference. The fifth preset temperature difference is greater than zero. In one embodiment, the fifth preset temperature difference can be set between 1°C and 3°C. For example, the fifth preset temperature difference can be set to 2°C. If the set domestic water temperature is more than 2°C higher than the outlet domestic water temperature, this indicates that the outlet domestic water temperature is low. As the heating water heats up, the outlet domestic water temperature will continue to decrease, necessitating an increase in the flow rate to the inlet of the first flow channel. In one embodiment, when the outlet domestic water temperature is less than the difference between the set domestic water temperature and the fifth preset temperature difference, the flow rate regulating device adjusts the ratio between the flow rate of water flowing into the first pipeline to the inlet of the indoor heating equipment and the flow rate to the inlet of the first flow channel, thereby increasing the flow rate to the inlet of the first flow channel by a first amount. In one embodiment, the flow rate regulating device can include a three-way valve driven by a stepper motor. When the outlet domestic water temperature is less than the set domestic water temperature minus 2°C, the three-way valve can be controlled to maintain a six-step movement toward the domestic water side. In this embodiment, when the outlet temperature of domestic water is lower than the set temperature of domestic water, the flow regulating device can be controlled to increase the water flow of heating water flowing to the domestic side by a first amplitude. This is because as the heat exchange proceeds, the temperature of the heating water will continue to drop, and the outlet temperature of domestic water will continue to drop. Therefore, it is necessary to increase the flow rate to the inlet of the first flow channel to increase the outlet temperature of domestic water to stabilize near the set temperature of domestic water.

[0181] In some embodiments of the present specification, after determining whether the domestic water outlet temperature is less than the difference between the domestic water set temperature and the fifth preset temperature difference, the method may further include: when it is determined that the domestic water outlet temperature is not less than the difference between the domestic water set temperature and the fifth preset temperature difference, determining whether the domestic water outlet temperature is less than the domestic water set temperature; when it is determined that the domestic water outlet temperature is less than the domestic water set temperature, controlling the flow regulating device to adjust the ratio between the flow rate of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow rate diverted to the inlet of the first flow channel, so that the flow rate flowing to the inlet of the first flow channel increases by a second amplitude, and the second amplitude is smaller than the first amplitude.

[0182] In this embodiment, when dynamically adjusting the water flow rate, if the temperature difference between the set domestic water temperature and the outlet domestic water temperature is determined to be no less than a fifth preset temperature difference, a determination is made as to whether the outlet domestic water temperature is less than the set domestic water temperature. In one embodiment, the fifth preset temperature difference can be set between 1°C and 3°C. For example, the fifth preset temperature difference can be set to 2°C. If the set domestic water temperature is higher than the outlet domestic water temperature and the temperature difference between the two is no greater than the fifth preset temperature difference, this indicates that the outlet domestic water temperature is slightly lower than the set domestic water temperature. As the heating water heat is exchanged, the outlet domestic water temperature will continue to decrease, necessitating an increase in the flow rate to the inlet of the first flow channel. In one embodiment, if the outlet domestic water temperature is less than the set domestic water temperature and greater than or equal to the difference between the set domestic water temperature and the fifth preset temperature difference, the flow rate regulating device adjusts the ratio between the flow rate of water flowing into the first pipeline to the inlet of the indoor heating device and the flow rate diverted to the inlet of the first flow channel, such that the flow rate to the inlet of the first flow channel increases by a second magnitude. The second magnitude is less than the first magnitude. In one embodiment, the flow control device may include a three-way valve driven by a stepper motor. When the outlet temperature of the domestic water is less than the set domestic water temperature and greater than or equal to the set domestic water temperature minus 2°C, the three-way valve may be controlled to maintain a four-step movement toward the domestic water side. In this embodiment, when the outlet domestic water temperature is slightly lower than the set domestic water temperature, the flow control device may be controlled to increase the flow rate of heating water to the domestic side by a second amount, thereby increasing the outlet domestic water temperature to stabilize near the set domestic water temperature.

[0183] In some embodiments of the present specification, after determining whether the domestic water outlet temperature is lower than the domestic water set temperature, the method may further include: when determining that the domestic water outlet temperature is not lower than the domestic water set temperature, determining whether the domestic water outlet temperature is lower than the sum of the domestic water set temperature and a sixth preset temperature difference; the sixth preset temperature difference is greater than zero; when determining that the domestic water outlet temperature is lower than the sum of the domestic water set temperature and the sixth preset temperature difference, controlling the flow regulating device to adjust the ratio between the flow of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow to the inlet of the first flow channel increases by a third amplitude, and the third amplitude is smaller than the second amplitude.

[0184] In this embodiment, when dynamically adjusting the water flow rate, if the domestic water outlet temperature is determined to be no less than the domestic water set temperature, the flow rate is then determined to be greater than the sum of the domestic water set temperature and a sixth preset temperature difference. The sixth preset temperature difference is greater than zero. In one embodiment, the sixth preset temperature difference can be set between 1°C and 3°C; for example, it can be set to 2°C. In one embodiment, if the domestic water outlet temperature is greater than or equal to the domestic water set temperature and less than the domestic water set temperature plus 2°C, and the domestic water outlet temperature is slightly higher than the domestic water set temperature, the heating water temperature will decrease as heat exchange continues, further reducing the domestic water outlet temperature. To prevent the domestic water outlet temperature from decreasing too quickly or too much, the flow rate regulating device can be controlled to increase the water flow rate to the first flow channel inlet by a third amount. The third amount is smaller than the second amount. In one embodiment, the flow regulating device can include a three-way valve driven by a stepper motor. If the domestic water outlet temperature is no less than the domestic water set temperature and less than the domestic water set temperature plus 2°C, the three-way valve can be controlled to maintain a two-step movement toward the domestic water side. In this embodiment, when the outlet temperature of domestic water is slightly higher than the set temperature of domestic water, the flow regulating device can be controlled to increase the water flow of heating water flowing to the domestic side by a third amplitude, so that the outlet temperature of domestic water increases and stabilizes near the set temperature of domestic water.

[0185] In some embodiments of the present specification, the step S20 may specifically include: determining whether the outlet temperature of the domestic water is greater than the sum of the set temperature of the domestic water and a third preset temperature difference; the third preset temperature difference is greater than zero; when it is determined that the outlet temperature of the domestic water is greater than the sum of the set temperature of the domestic water and the third preset temperature difference, controlling the flow regulating device to adjust the ratio between the flow of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow to the inlet of the first flow channel is reduced.

[0186] In this embodiment, when dynamically adjusting the water flow rate, it is possible to determine whether the outlet temperature of the domestic water is greater than the sum of the set temperature of the domestic water and a third preset temperature difference. The third preset temperature difference can be set between 2°C and 6°C, for example, 4°C. When the temperature difference between the outlet temperature of the domestic water and the set temperature of the domestic water is greater than 4°C, the flow control device can be controlled to adjust the ratio of the flow diverted to the inlet of the indoor heating equipment to the flow diverted to the inlet of the first flow channel, thereby reducing the flow to the inlet of the first flow channel. In one embodiment, the flow control device can include a three-way valve driven by a stepper motor. For example, when the temperature difference between the outlet temperature of the domestic water and the set temperature of the domestic water is greater than 4°C, the stepper motor can be used to control the three-way valve to move 1-3 steps toward the heating side to reduce the water flow to the domestic side. In this manner, when the outlet temperature of the domestic water exceeds the set temperature of the domestic water by a large margin, the flow of heating water to the domestic side can be reduced to lower the outlet temperature of the domestic water.

[0187] In some embodiments of the present specification, after determining whether the domestic water outlet temperature is greater than the sum of the domestic water set temperature and the third preset temperature difference, the method may further include: when it is determined that the domestic water outlet temperature is not greater than the sum of the domestic water set temperature and the third preset temperature difference, determining whether the domestic water outlet temperature is greater than the sum of the domestic water set temperature and the fourth preset temperature difference; the fourth preset temperature difference is greater than zero and less than the third preset temperature difference; when it is determined that the domestic water outlet temperature is greater than the sum of the domestic water set temperature and the fourth preset temperature difference, controlling the flow regulating device to keep the ratio between the flow of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel unchanged, so that the flow to the inlet of the first flow channel remains unchanged.

[0188] In this embodiment, when it is determined that the temperature of the domestic water outlet is not greater than the third preset temperature difference from the set temperature of the domestic water, it is judged whether the temperature difference between the two is greater than the fourth preset temperature difference. The fourth preset temperature difference is greater than zero and less than the third preset temperature difference. In one embodiment, the fourth preset temperature difference can be set to 1°C to 3°C. For example, the third preset temperature difference can be set to 4°C, and the fourth preset temperature difference can be set to 2°C. When the temperature of the domestic water outlet is not greater than the third preset temperature difference and greater than the fourth preset temperature difference from the set temperature of the domestic water, the flow control device is controlled to keep the ratio between the flow rate diverted to the inlet of the indoor heating device and the flow rate diverted to the inlet of the first flow path unchanged, so that the flow rate flowing to the inlet of the first flow path remains unchanged. In one embodiment, the flow control device may include a three-way valve. When the temperature difference between the temperature of the domestic water outlet and the set temperature of the domestic water is greater than 2°C and not greater than 4°C, the three-way valve can be controlled to maintain its current position. In this embodiment, when the temperature of the domestic water outlet is slightly higher than the set temperature of the domestic water, the water flow rate of the heating water flowing to the domestic side can be kept unchanged. This is because as heat exchange proceeds, the temperature of the heating water will naturally drop, and the temperature of the domestic water outlet will correspondingly decrease. Therefore, keeping the current water flow rate unchanged can make the temperature of the domestic water outlet stable near the set temperature of the domestic water.

[0189] Please refer to Figure 5 , which shows the flowchart of step S20 in the embodiment of this specification. As Figure 5 shown, in step S20, the following sub-steps are included. In this embodiment, the flow control device is a three-way valve, and a stepper motor is used to drive the three-way valve to act.

[0190] Step 1: Judge whether T2 < Ts - 2 is satisfied. If yes, execute Step 2; otherwise, execute Step 3. Here, T2 is the temperature of the domestic water outlet, and Ts is the set temperature of the domestic water.

[0191] Step 2: Control the three-way valve to move 6 steps towards the domestic water side.

[0192] Step 3: Judge whether T2 < Ts is satisfied. If yes, execute Step 4; otherwise, execute Step 5.

[0193] Step 4: Control the three-way valve to move 4 steps towards the domestic water side.

[0194] Step 5: Judge whether T2 < Ts + 2 is satisfied. If yes, execute Step 6; otherwise, execute Step 7. <0000四、

[0195] Step 6: Control the three-way valve to move 2 steps towards the domestic water side.

[0196] Step 7: Judge whether T2 < Ts + 4 is satisfied. If yes, execute Step 8; otherwise, execute Step 9.

[0197] Step 8: Control the three-way valve to maintain the current position.

[0198] Step 9, control the three-way valve to move 1 step toward the heating side.

[0199] In some embodiments of the present specification, after controlling the burner to burn according to the target power to heat the first heat exchanger, the method may further include: controlling the burner to stop burning when the heating water outlet temperature is greater than the sum of the domestic water set temperature and the first preset temperature difference.

[0200] In this embodiment, after controlling the burner combustion according to the target power for constant temperature regulation, the burner can be controlled to stop combustion when the heating water outlet temperature is greater than the sum of the domestic water set temperature and the first preset temperature difference to avoid overheating on the domestic water side.

[0201] Please refer to Figure 6 , shows a flow chart of the gas water heater control method in the embodiment of this specification. Figure 6 As shown, the control method in this specific embodiment includes the following steps: In this embodiment, the flow regulating device is a three-way valve, which is driven by a stepping motor.

[0202] Step 1: Receive domestic water signal.

[0203] Step 2: Determine whether T1 - Ts > Δt1. If so, proceed to Step 3; otherwise, proceed to Step 4. T1 is the heating water outlet temperature, i.e., the temperature of the water flowing out of the first heat exchanger. Ts is the set domestic water temperature. Δt1 is the first preset temperature difference, which can be set to 15°C, for example.

[0204] Step 3: Control the burner to extinguish or maintain the extinguished state. Go to step 5.

[0205] Step 4: Control the burner to start combustion or maintain combustion, and control all three-way valves to move to the domestic water side. Jump to step 15.

[0206] Step 5: Control the three-way valve to move away from the heating side by a first preset number of steps. For example, the first preset number of steps may be 30 steps.

[0207] Step 6: Control the movement of the three-way valve according to the temperature difference between T2 and Ts, where T2 is the outlet temperature of domestic water.

[0208] Step 7: Determine whether the domestic water usage time reaches the preset time. If so, proceed to step 8; otherwise, proceed to step 9.

[0209] Step 8: Move all three-way valves to the domestic water side. Go to step 10.

[0210] Step 9: Determine whether T1-Ts>Δt2 is satisfied. Δt2 is a second preset temperature difference, which can be set to 12° C. If so, return to step 6; otherwise, execute step 8.

[0211] Step 10: Determine whether T2 > Ts. If so, proceed to step 11; otherwise, proceed to step 12.

[0212] Step 11: Control the circulation pump to stop working. Go to step 13.

[0213] Step 12: Control the circulation pump to start working. Go to step 13.

[0214] Step 13: Determine whether the ignition condition is met based on T1, Ts, and F. If so, proceed to step 14; otherwise, return to step 10. Where F is the flow rate of domestic water in the second flow channel.

[0215] Step 14, controlling the burner to start combustion.

[0216] Step 15: Control the burner combustion according to the current required load to perform constant temperature regulation.

[0217] Please refer to Figure 7 , shows a flow chart of the gas water heater control method in the embodiment of this specification. Figure 7 As shown, the control method in this specific embodiment includes the following steps: In this embodiment, the flow regulating device is a three-way valve, which is driven by a stepping motor.

[0218] Step 1: Receive domestic water signal.

[0219] Step 2: Determine whether T1 - Ts > Δt1. If so, proceed to Step 3; otherwise, proceed to Step 4. T1 is the heating water outlet temperature, i.e., the temperature of the water flowing out of the first heat exchanger. Ts is the set domestic water temperature. Δt1 is the first preset temperature difference, which can be set to 15°C, for example.

[0220] Step 3: Control the burner to burn according to the minimum power. Go to step 5.

[0221] Step 4: Control the burner to start or maintain combustion, and control all three-way valves to move to the domestic water side. Jump to step 7.

[0222] Step 5: Control the three-way valve to move away from the heating side by a second preset number of steps. The second preset number of steps is smaller than the first preset number of steps. For example, the first preset number of steps may be 25 steps.

[0223] Step 6: Adjust the burner's combustion power so that T1 - Ts approaches Δt2. Control the movement of the three-way valve based on the temperature difference between T2 and Ts until all three valves are positioned toward the domestic water supply. Δt2 represents a second preset temperature difference, for example, 12°C. T2 represents the domestic water outlet temperature.

[0224] Step 7: Control the burner combustion according to the current required load to perform constant temperature regulation.

[0225] An embodiment of this specification also provides a controller, which may include a processor and a memory for storing processor-executable instructions. When the processor executes the instructions, the steps of the gas water heater control method described in any of the above embodiments are implemented.

[0226] The embodiment of this specification also provides a gas water heater, which may include: the controller in the above embodiment. Figures 1 to 3 As shown, the gas water heater 10 may further include: a first heat exchanger 101, a burner 102, a first pipeline 103 and a second pipeline 104, a second heat exchanger 105, a flow regulating device 106 and a circulation pump 107. For a detailed description of the gas water heater, please refer to the description in the above embodiment, which will not be repeated here.

[0227] The embodiments of this specification also provide a heating system. The heating system may include: a gas water heater according to any of the above embodiments. The heating system may also include indoor heating equipment. The inlet of the indoor heating equipment is connected to the water outlet of the first heat exchanger via a first pipeline, and the outlet of the indoor heating equipment is connected to the water inlet of the first heat exchanger via a second pipeline.

[0228] The embodiments of this specification also provide a computer storage medium based on the gas water heater control method, wherein the computer storage medium stores computer program instructions, and when the computer program instructions are executed, the steps of the gas water heater control method described in any of the above embodiments are implemented.

[0229] In this embodiment, the storage medium includes, but is not limited to, random access memory (RAM), read-only memory (ROM), cache, hard disk drive (HDD), or memory card. The memory can be used to store computer program instructions. The network communication unit can be an interface configured in accordance with the standards specified by the communication protocol for network connection communication.

[0230] In this embodiment, the functions and effects specifically implemented by the program instructions stored in the computer storage medium can be explained in comparison with other embodiments and will not be repeated here.

[0231] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. For details, please refer to the description of the aforementioned related processing embodiments, and no further description is given here.

[0232] The foregoing description of this specification describes specific embodiments. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0233] Obviously, those skilled in the art should understand that the various modules or steps of the above-mentioned embodiments of this specification can be implemented using a general-purpose computing device, they can be concentrated on a single computing device, or distributed across a network composed of multiple computing devices. Alternatively, they can be implemented using program code executable by the computing device, so that they can be stored in a storage device and executed by the computing device. In some cases, the steps shown or described can be performed in a different order than herein, or they can be made into separate integrated circuit modules, or multiple modules or steps can be made into a single integrated circuit module for implementation. Thus, the embodiments of this specification are not limited to any specific combination of hardware and software.

[0234] It should be understood that the above description is intended to be illustrative and not limiting. Numerous embodiments and applications beyond the examples provided will be readily apparent to those skilled in the art upon reading the above description. Therefore, the scope of this specification should not be determined with reference to the above description, but rather with reference to the preceding claims, along with the full scope of equivalents to which such claims are entitled.

[0235] The above description is merely a preferred embodiment of this specification and is not intended to limit this specification. Those skilled in the art will readily appreciate that various modifications and variations to the embodiments of this specification are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this specification shall be within the scope of protection of this specification.

Claims

1. A gas water heater control method, characterized in that: The gas water heater comprises: a first heat exchanger; a burner, wherein the burner is used to heat the first heat exchanger; a first pipe and a second pipe, wherein the first pipe is used to allow at least part of the water flowing out of the water outlet of the first heat exchanger to flow to the indoor heating equipment, and the second pipe is used to return the water flowing through the indoor heating equipment to the water inlet of the first heat exchanger; a second heat exchanger, wherein the second heat exchanger has a first flow channel and a second flow channel isolated from each other, the inlet of the first flow channel can be connected to the first pipe so that at least part of the water in the first pipe can flow into the inlet of the first flow channel, the outlet of the first flow channel can be connected to the second pipe so that the water flowing out of the outlet of the first flow channel can flow into the second pipe, and the second a flow channel for circulating domestic water, wherein the water flowing through the first flow channel and the water flowing through the second flow channel can perform heat exchange; a flow regulating device, wherein the flow regulating device is used to regulate the flow rate of the water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel; a circulating pump, wherein the circulating pump is arranged on the first pipeline or the second pipeline, and the circulating pump can be used to drive the water flowing from the outlet of the indoor heating equipment into the second pipeline to flow through the first heat exchanger and then from the first pipeline to the inlet of the indoor heating equipment. The circulating pump is also used to drive the water flowing from the outlet of the first flow channel into the second pipeline to flow through the first heat exchanger and then from the first pipeline to the inlet of the first flow channel; Wherein, the control method includes: Step S10, when receiving a domestic water supply signal in the heating state, controlling the flow regulating device to regulate the flow of water flowing into the first pipeline to the inlet of the indoor heating device and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating device and the other part of the water flows to the inlet of the first flow channel; Step S20, according to the domestic water outlet temperature and the domestic water set temperature, controls the flow regulating device to adjust the ratio between the flow of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel; the domestic water outlet temperature is the temperature of water flowing out of the outlet of the second flow channel.

2. The gas water heater control method according to claim 1, characterized in that: In the step S10, the flow rate of the portion of water flowing to the inlet of the indoor heating device is greater than the flow rate of the other portion of water flowing to the inlet of the first flow channel, and the flow rate of the other portion of water is a preset flow rate; or, The step S10 specifically includes: According to the temperature difference between the heating water outlet temperature and the set temperature of domestic water and / or the domestic water flow rate at the inlet of the second flow channel, the flow regulating device is controlled to adjust the flow rate of water flowing into the first pipeline to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel; the flow rate of the other part of water flowing to the inlet of the first flow channel is negatively correlated with the temperature difference, and / or the flow rate of the other part of water flowing to the inlet of the first flow channel is positively correlated with the domestic water flow rate; the heating water outlet temperature is the temperature of the water flowing out of the outlet of the first heat exchanger.

3. The gas water heater control method according to claim 1, characterized in that: The step S10 specifically includes: When receiving a domestic water use signal in the heating state, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference; the heating water outlet temperature is the temperature of water flowing out of the water outlet of the first heat exchanger; and the first preset temperature difference is greater than zero; When it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is greater than the first preset temperature difference, the flow regulating device is controlled to adjust the flow rate of the water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel.

4. The gas water heater control method according to claim 1, characterized in that: The step S10 specifically includes: When receiving a domestic water use signal in the heating state, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference; the heating water outlet temperature is the temperature of water flowing out of the water outlet of the first heat exchanger; and the first preset temperature difference is greater than zero; When it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is greater than the first preset temperature difference, the burner is controlled to stop burning or maintain the stopped burning state; the flow regulating device is controlled to adjust the flow rate of the water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel.

5. The gas water heater control method according to claim 3 or 4, characterized in that: After determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference, the method further includes: Step S30, when it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is not greater than the first preset temperature difference, the burner is controlled to start combustion or maintain the combustion state, and the flow regulating device is controlled to regulate the flow of water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that all the water flowing into the first pipeline flows to the inlet of the first flow channel.

6. The gas water heater control method according to claim 5, characterized in that: After step S30, the method further includes: The target power of the gas water heater is determined according to the current required load, and the burner is controlled to burn according to the target power to heat the first heat exchanger.

7. The gas water heater control method according to claim 4, characterized in that: After step S20, the method further includes: Determine whether the duration of domestic water use has reached the preset duration; If it is determined that the domestic water usage time has not reached the preset time, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a second preset temperature difference; the second preset temperature difference is greater than zero; If it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is greater than the second preset temperature difference, the process returns to step S20.

8. The gas water heater control method according to claim 7, characterized in that: Also includes: Step S40, when it is determined that the usage time of domestic water reaches a preset time or when it is determined that the temperature difference between the heating water outlet temperature and the domestic water set temperature is not greater than a second preset temperature difference, the flow regulating device is controlled to adjust the flow rate of the water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that all the water flowing into the first pipeline flows to the inlet of the first flow channel.

9. The gas water heater control method according to claim 8, characterized in that: After step S40, the method further includes: Step S50 , controlling the circulation pump to start or stop according to the outlet temperature of the domestic water and the set temperature of the domestic water, so that the outlet temperature of the domestic water is close to the set temperature of the domestic water.

10. The gas water heater control method according to claim 9, characterized in that: The step S50 specifically includes: When the outlet temperature of the domestic water is higher than the set temperature of the domestic water, controlling the circulation pump to stop working; When the outlet temperature of the domestic water is not higher than the set temperature of the domestic water, the circulation pump is controlled to start working.

11. The gas water heater control method according to claim 9, characterized in that: The step S50 specifically includes: When the outlet temperature of the domestic water is higher than the set temperature of the domestic water and the temperature difference between the two is greater than a first difference value, controlling the circulation pump to stop working for a first preset time period; When the set domestic water temperature is higher than the domestic water outlet temperature and the temperature difference between the two is greater than a second difference, the circulation pump is controlled to start and continue to work for a second preset time period.

12. The gas water heater control method according to claim 9, characterized in that: After step S40 or step S50, the method further includes: determining whether an ignition condition is met based on the heating water outlet temperature, the set domestic water temperature, and the domestic water flow rate at the inlet of the second flow channel; When it is determined that the ignition condition is met, controlling the burner to start combustion; The target power of the gas water heater is determined according to the current required load, and the burner is controlled to burn according to the target power to heat the first heat exchanger.

13. The gas water heater control method according to claim 1, characterized in that: The step S10 specifically includes: When receiving a domestic water use signal in the heating state, determining whether the temperature difference between the heating water outlet temperature and the domestic water set temperature is greater than a first preset temperature difference; the heating water outlet temperature is the temperature of water flowing out of the water outlet of the first heat exchanger; and the first preset temperature difference is greater than zero; When it is determined that the temperature difference between the heating water outlet temperature and the living water set temperature is greater than the first preset temperature difference, the burner is controlled to burn according to the minimum power; the flow regulating device is controlled to adjust the flow rate of the water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel, so that part of the water flows to the inlet of the indoor heating equipment and the other part of the water flows to the inlet of the first flow channel.

14. The gas water heater control method according to claim 13, characterized in that: The step S20 specifically includes: The burner is controlled to burn according to the temperature difference between the heating water outlet temperature and the domestic water set temperature, so that the temperature difference between the heating water outlet temperature and the domestic water set temperature is close to a second preset temperature difference; according to the domestic water outlet temperature and the domestic water set temperature, the flow regulating device is controlled to adjust the ratio between the flow rate of the water flowing into the first pipeline to the inlet of the indoor heating equipment and the flow rate diverted to the inlet of the first flow channel, until all the water flowing into the first pipeline flows to the inlet of the first flow channel.

15. The gas water heater control method according to claim 14, characterized in that: After step S20, the method further includes: The target power of the gas water heater is determined according to the current required load, and the burner is controlled to burn according to the target power to heat the first heat exchanger.

16. The gas water heater control method according to claim 1, characterized in that: The step S20 specifically includes: When the outlet temperature of the domestic water is higher than the set domestic water temperature, controlling the flow regulating device to adjust the ratio between the flow rate of the water flowing into the first pipe diverted to the inlet of the indoor heating device and the flow rate diverted to the inlet of the first flow channel, so that the flow rate diverted to the inlet of the first flow channel is reduced; When the outlet temperature of the domestic water is lower than the set temperature of the domestic water, the flow regulating device is controlled to adjust the ratio between the flow of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow diverted to the inlet of the first flow channel increases.

17. The gas water heater control method according to claim 1, characterized in that: The step S20 specifically includes: Determining whether the outlet temperature of the domestic water is greater than the sum of the set domestic water temperature and a third preset temperature difference; the third preset temperature difference is greater than zero; When it is determined that the outlet temperature of the domestic water is greater than the sum of the set temperature of the domestic water and the third preset temperature difference, the flow regulating device is controlled to adjust the ratio between the flow of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow to the inlet of the first flow channel is reduced.

18. The gas water heater control method according to claim 17, characterized in that: After determining whether the outlet temperature of the domestic water is greater than the sum of the set domestic water temperature and a third preset temperature difference, the method further includes: If it is determined that the outlet temperature of the domestic water is not greater than the sum of the set temperature of the domestic water and the third preset temperature difference, determining whether the outlet temperature of the domestic water is greater than the sum of the set temperature of the domestic water and a fourth preset temperature difference; the fourth preset temperature difference is greater than zero and less than the third preset temperature difference; When it is determined that the outlet temperature of the domestic water is greater than the sum of the set domestic water temperature and the fourth preset temperature difference, the flow regulating device is controlled to keep the ratio between the flow of water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel unchanged, so that the flow to the inlet of the first flow channel remains unchanged.

19. The gas water heater control method according to claim 1, characterized in that: The step S20 specifically includes: Determining whether the outlet temperature of the domestic water is less than the difference between the set domestic water temperature and a fifth preset temperature difference; the fifth preset temperature difference is greater than zero; When it is determined that the outlet temperature of the domestic water is less than the difference between the set temperature of the domestic water and the fifth preset temperature difference, the flow regulating device is controlled to adjust the ratio between the flow of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow to the inlet of the first flow channel increases by a first amplitude.

20. The gas water heater control method according to claim 19, characterized in that: After determining whether the outlet temperature of the domestic water is less than the difference between the set domestic water temperature and a fifth preset temperature difference, the method further includes: If it is determined that the outlet temperature of the domestic water is not less than the difference between the set temperature of the domestic water and a fifth preset temperature difference, determining whether the outlet temperature of the domestic water is less than the set temperature of the domestic water; When it is determined that the outlet temperature of the domestic water is lower than the set temperature of the domestic water, the flow regulating device is controlled to adjust the ratio between the flow of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow to the inlet of the first flow channel increases by a second amplitude, and the second amplitude is smaller than the first amplitude.

21. The gas water heater control method according to claim 20, characterized in that: After determining whether the outlet temperature of the domestic water is lower than the set domestic water temperature, the method further includes: If it is determined that the outlet temperature of the domestic water is not less than the set temperature of the domestic water, determining whether the outlet temperature of the domestic water is less than the sum of the set temperature of the domestic water and a sixth preset temperature difference; the sixth preset temperature difference is greater than zero; When it is determined that the outlet temperature of the domestic water is lower than the sum of the set temperature of the domestic water and the sixth preset temperature difference, the flow regulating device is controlled to adjust the ratio between the flow of the water flowing into the first pipeline diverted to the inlet of the indoor heating equipment and the flow diverted to the inlet of the first flow channel, so that the flow to the inlet of the first flow channel increases by a third amplitude, and the third amplitude is smaller than the second amplitude.

22. The gas water heater control method according to any one of claims 6, 12 and 15, characterized in that: After controlling the burner to burn according to the target power to heat the first heat exchanger, the method further includes: When the outlet heating water temperature is greater than the sum of the set domestic water temperature and a first preset temperature difference, the burner is controlled to stop combustion.

23. A controller, characterized in that: The controller includes a processor and a memory for storing processor-executable instructions, and the processor implements the steps of the gas water heater control method according to any one of claims 1 to 22 when executing the instructions.

24. A gas water heater, characterized in that: The gas water heater comprises: The controller according to claim 23; a first heat exchanger; a burner, the burner being used to heat the first heat exchanger; a first pipe and a second pipe, wherein the first pipe is used to allow at least part of the water flowing out of the water outlet of the first heat exchanger to flow to the indoor heating equipment, and the second pipe is used to return the water flowing through the indoor heating equipment to the water inlet of the first heat exchanger; a second heat exchanger having a first flow channel and a second flow channel isolated from each other, wherein the inlet of the first flow channel can be communicated with the first pipeline so that at least part of the water in the first pipeline can flow into the inlet of the first flow channel, and the outlet of the first flow channel can be communicated with the second pipeline so that water flowing out of the outlet of the first flow channel can flow into the second pipeline, and the second flow channel is used to circulate domestic water, and water flowing through the first flow channel and water flowing through the second flow channel can exchange heat; a flow regulating device for regulating the flow of water flowing into the first pipeline to be diverted to the inlet of the indoor heating equipment and the inlet of the first flow channel; A circulating pump is provided on the first pipeline or the second pipeline. The circulating pump can be used to drive the water flowing from the outlet of the indoor heating equipment into the second pipeline to flow through the first heat exchanger and then flow from the first pipeline to the inlet of the indoor heating equipment. The circulating pump is also used to drive the water flowing from the outlet of the first flow channel into the second pipeline to flow through the first heat exchanger and then flow from the first pipeline to the inlet of the first flow channel.

25. The gas water heater according to claim 24, characterized in that: The flow regulating device includes a three-way valve; The first port of the three-way valve is connected to the first pipeline, the second port of the three-way valve is connected to the inlet of the first flow channel, and the third port of the three-way valve is connected to the inlet of the indoor heating equipment; or, The first port of the three-way valve is communicated with the second pipeline, the second port of the three-way valve is communicated with the outlet of the first flow channel, and the third port of the three-way valve is communicated with the outlet of the indoor heating equipment.

26. The gas water heater according to claim 24, characterized in that The gas water heater further includes: a first connecting pipe, the first connecting pipe being used to connect the first pipe and the inlet of the first flow channel; a second connecting pipe, the second connecting pipe being used to connect the second pipe and the outlet of the first flow channel; The flow regulating device comprises: a first valve, the first valve being disposed on the first communicating pipe or the second communicating pipe to regulate a flow of water flowing into or out of the first flow channel; The second valve is arranged on the first pipeline between the first connecting part between the first pipeline and the first connecting pipeline and the inlet of the indoor heating equipment to regulate the water flow flowing into the indoor heating equipment; or the second valve is arranged on the second pipeline between the second connecting part between the second pipeline and the second connecting pipeline and the outlet of the indoor heating equipment to regulate the water flow out of the indoor heating equipment.

27. The gas water heater according to claim 24, characterized in that: The gas water heater further comprises: a first temperature sensor, the first temperature sensor being used to detect a heating water outlet temperature, the heating water outlet temperature being a temperature of water flowing out of an outlet of the first heat exchanger; The second temperature sensor is used to detect the outlet temperature of domestic water, which is the temperature of water flowing out of the outlet of the second flow channel of the second heat exchanger.

28. A heating system, characterized in that: include: A gas water heater according to any one of claims 24 to 27; Indoor heating equipment, the inlet of the indoor heating equipment is connected to the water outlet of the first heat exchanger through a first pipeline, and the outlet of the indoor heating equipment is connected to the water inlet of the first heat exchanger through a second pipeline.

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