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 when the gas water heating device is in a double-source heating mode, a first flow adjusting device is controlled, so that at least part of water flows to a first communicating pipe; controlling the combustor to start combustion; and when the combustor continuously combusts for a first preset time period, if the heating return water temperature of the gas water heating device is larger than the water inlet temperature of the first heat exchanger, the heating water outlet set temperature of the gas water heating device is controlled to be reduced. According to the scheme, the heating cost can be reduced on the premise of ensuring the comfort of a user.

Description

Technical Field

[0001] This specification relates to the field of water heating technology, and in particular to a control method, controller, gas-fired hot water device and heating system. Background Technology

[0002] In existing centralized heating areas, wall-hung boilers employ a dual-source heating mode, which involves the boiler's burner and the centralized heating system working together to provide heating. However, improper coordination between the burner and the centralized heating system can easily lead to the following problems: if the focus is on gas heating, energy consumption will increase, resulting in higher heating costs for users; if the focus is on centralized heating, while user costs may decrease, comfort will also decline.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This specification provides a control method, controller, gas-fired hot water device, and heating system to solve the problem of increased heating costs or decreased user comfort caused by improper coordination between the burner and centralized heating in the existing dual-source heating mode.

[0005] This specification provides an embodiment of a control method for a gas-fired water heating device, the gas-fired water heating device comprising:

[0006] First heat exchanger;

[0007] A burner for heating the first heat exchanger;

[0008] A first pipeline and a second pipeline, wherein the first pipeline is used to transport at least a portion of the water flowing out of the outlet of the first heat exchanger to the indoor heating equipment, and the second pipeline is used to return the water flowing through the indoor heating equipment to the inlet of the first heat exchanger.

[0009] A first connecting pipe and a second connecting pipe are connected to the second pipeline. The first connecting pipe is located upstream of the second connecting pipe. The first connecting pipe is used to lead at least a portion of the water flowing into the second pipeline to an external heat source. The second connecting pipe is used to allow water heated by the external heat source to flow into the second pipeline.

[0010] A circulation pump is installed on the first pipeline or the second pipeline. The circulation pump can be used to drive water flowing from the outlet of the indoor heating equipment into the second pipeline, through the first heat exchanger, and then from the first pipeline to the inlet of the indoor heating equipment.

[0011] A first flow regulating device is used to regulate the water flow rate to the first connecting pipe.

[0012] The control method includes:

[0013] When the gas-fired water heater is in dual-source heating mode, the first flow regulating device is controlled so that at least part of the water flows to the first connecting pipe; the burner is controlled to start combustion.

[0014] When the burner continues to burn for a first preset time period, if the heating return water temperature of the gas water heater is greater than the inlet water temperature of the first heat exchanger, the heating outlet water set temperature of the gas water heater is controlled to decrease.

[0015] In one embodiment, when the burner continues to burn for a first preset time period, if the temperature difference between the heating return water temperature and the inlet water temperature of the first heat exchanger is greater than or equal to the first preset temperature difference, the heating outlet water setting temperature of the gas-fired water heater is controlled to decrease; the first preset temperature difference is greater than zero.

[0016] In one embodiment, the method further includes:

[0017] When the temperature difference between the outlet water temperature of the first heat exchanger of the gas-fired water heater and the set temperature of the heating outlet water is greater than or equal to the second preset temperature difference, the burner is controlled to stop combustion; the second preset temperature difference is greater than zero.

[0018] In one embodiment, controlling the heating outlet water set temperature of the gas-fired water heater to decrease includes:

[0019] The heating outlet water temperature of the gas-fired water heater is controlled to decrease by a third preset temperature difference; the third preset temperature difference is greater than zero.

[0020] In one embodiment, the third preset temperature difference is 1°C to 10°C.

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

[0022] When the burner continues to burn for a first preset time period, if the heating return water temperature of the gas water heater is greater than the inlet water temperature of the first heat exchanger of the gas water heater, the first flow regulating device is controlled to reduce the water flow to the first connecting pipe.

[0023] In one embodiment, controlling the first flow regulating device to reduce the water flow rate to the first connecting pipe includes:

[0024] Control the first flow regulating device so that the water flow to the first connecting pipe is zero.

[0025] In one embodiment, after controlling the burner to stop combustion, the method further includes:

[0026] When the water temperature in the pipeline of the gas-fired water heater is lower than the set temperature of the heating outlet water, the first flow regulating device is controlled so that at least part of the water flows to the first connecting pipe; the burner is controlled to start combustion; the pipeline of the gas-fired water heater includes: the first pipeline, the second pipeline, the first connecting pipe and / or the second connecting pipe.

[0027] In one embodiment, when the temperature difference between the set temperature of the heating outlet water and the water temperature in the pipeline of the gas-fired water heater is greater than or equal to the difference of a fourth preset temperature difference, the first flow regulating device is controlled to make at least a portion of the water flow to the first connecting pipe; the burner is controlled to start combustion; and the fourth preset temperature difference is greater than zero.

[0028] In one embodiment, after controlling the set temperature of the heating outlet water of the gas-fired water heater to decrease, the method further includes:

[0029] When the set temperature of the heating outlet water is lower than the minimum set temperature of the gas-fired water heater, the minimum set temperature shall be used as the set temperature of the heating outlet water.

[0030] In one embodiment, after controlling the set temperature of the heating outlet water of the gas-fired water heater to decrease, the method further includes:

[0031] When the set temperature of the heating outlet water is lower than the minimum set temperature of the gas-fired water heater, the maximum set temperature of the gas-fired water heater shall be used as the set temperature of the heating outlet water; or...

[0032] When the set temperature of the heating outlet water is lower than the minimum set temperature of the gas-fired water heater, the initial set temperature of the heating outlet water of the gas-fired water heater shall be used as the set temperature of the heating outlet water.

[0033] In one embodiment, the gas-fired water heater further includes:

[0034] The second heat exchanger has a first flow channel and a second flow channel that are isolated from each other. The inlet of the first flow channel can be connected to 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. The outlet of the first flow channel can be connected to the second pipeline so that the water flowing out of the outlet of the first flow channel can flow into the second pipeline. The second flow channel is used for circulating domestic water. The water flowing through the first flow channel and the water flowing through the second flow channel can exchange heat.

[0035] In one embodiment, the gas-fired water heater further includes:

[0036] The second flow regulating device is used to direct the water flowing into the first pipeline to the inlet of the indoor heating equipment and / or the inlet of the first flow channel.

[0037] In one embodiment, the circulation pump is located upstream of the first connecting pipe or downstream of the second connecting pipe.

[0038] In one embodiment, the gas-fired water heater further includes:

[0039] The first temperature sensor is installed on a portion of the second pipe upstream of the first connecting pipe; the heating return water temperature of the gas-fired water heater is the temperature detected by the first temperature sensor.

[0040] A second temperature sensor is disposed on a portion of the second pipe downstream of the second connecting pipe or at the inlet of the first heat exchanger; the inlet water temperature of the first heat exchanger is the temperature detected by the second temperature sensor; and / or...

[0041] A third temperature sensor is installed at the outlet of the first heat exchanger or on the first pipeline; the outlet temperature of the first heat exchanger is the temperature detected by the third temperature sensor.

[0042] In one embodiment, the first flow regulating device is disposed at the first connection portion between the first connecting pipe and the second pipeline, or the first flow regulating device is disposed at the second connection portion between the second connecting pipe and the second pipeline;

[0043] The first flow regulating device is a three-way flow regulating valve.

[0044] In one embodiment, the first flow regulating device includes a first valve, which is disposed on the first connecting pipe or the second connecting pipe.

[0045] In one embodiment, the first flow regulating device further includes a second valve disposed on a portion of the second pipeline between the first connecting portion and the second connecting portion, wherein the first connecting portion is the connecting portion between the first connecting pipe and the second pipeline, and the second connecting portion is the connecting portion between the second connecting portion and the second pipeline.

[0046] This specification also provides a controller, including a processor and a memory for storing processor-executable instructions, wherein the processor executes the instructions to implement the steps of the gas water heater control method described in any of the above embodiments.

[0047] This specification also provides a computer-readable storage medium storing computer instructions that, when executed, implement the steps of the gas-fired water heater control method described in any of the above embodiments.

[0048] This specification also provides an embodiment of a gas-fired hot water device, comprising:

[0049] The controller described in any of the above embodiments;

[0050] First heat exchanger;

[0051] A burner for heating the first heat exchanger;

[0052] A first pipeline and a second pipeline, wherein the first pipeline is used to transport at least a portion of the water flowing out of the outlet of the first heat exchanger to the indoor heating equipment, and the second pipeline is used to return the water flowing through the indoor heating equipment to the inlet of the first heat exchanger.

[0053] A first connecting pipe and a second connecting pipe are connected to the second pipeline. The first connecting pipe is located upstream of the second connecting pipe. The first connecting pipe is used to lead at least a portion of the water flowing into the second pipeline to an external heat source. The second connecting pipe is used to allow water heated by the external heat source to flow into the second pipeline.

[0054] A circulation pump is installed on the first pipeline or the second pipeline. The circulation pump can be used to drive water flowing from the outlet of the indoor heating equipment into the second pipeline, through the first heat exchanger, and then from the first pipeline to the inlet of the indoor heating equipment.

[0055] A first flow regulating device is used to regulate the water flow rate to the first connecting pipe.

[0056] This specification also provides a heating system, including:

[0057] The gas-fired water heating device described in any of the above embodiments;

[0058] An indoor heating device, wherein the inlet of the indoor heating device is connected to the outlet of the first heat exchanger via a first pipe, and the outlet of the indoor heating device is connected to the inlet of the first heat exchanger via a second pipe.

[0059] In one embodiment, the heating system further includes:

[0060] An external heat source has a first connection port connected to the first connecting pipe and a second connection port connected to the second connecting pipe; water flowing out of the first connecting pipe can flow into the first connection port, be heated by the external heat source, and then flow through the second connection port to the second connecting pipe.

[0061] In one embodiment, the external heat source includes:

[0062] The third heat exchanger includes a first water flow path and a second water flow path. The first and second connecting ports are connected to the first water flow path. The second water flow path is used to connect to municipal heating. Municipal heating water flows through the second water flow path. The water flowing through the first water flow path and the water flowing through the second water flow path exchange heat.

[0063] In one embodiment, the third heat exchanger is located at a predetermined indoor position.

[0064] The technical solution in this specification has the following significant advantages:

[0065] The gas-fired water heater control method described in this specification has a dual-source heating mode. In this mode, both the burner and an external heat source can heat the water. A first flow regulating device can be controlled to direct at least a portion of the water to the first connecting pipe. At this time, at least a portion of the water flowing from the first heat exchanger to the indoor heating equipment flows into the external heat source after passing through the first connecting pipe, and then flows back to the first heat exchanger via the second connecting pipe. The burner is then controlled to start combustion. If, during a first preset combustion period, the return water temperature of the gas-fired water heater is higher than the inlet water temperature of the first heat exchanger, it indicates that the external heat source cannot heat the water flowing into it, meaning that the heat from the external heat source cannot be used to heat the user. In this case, the set temperature of the gas-fired water heater's outlet water is lowered, reducing the temperature of the water flowing out of the first heat exchanger. This, in turn, lowers the return water temperature of the gas-fired water heater, thus reducing the temperature of the water flowing into the external heat source. This allows for full utilization of the external heat source's energy, saving gas costs and providing energy-efficient and comfortable heating for the user.

[0066] Specific embodiments of the invention are disclosed in detail below with reference to the description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the invention are not therefore limited in scope. Features described and / or shown 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.

[0067] It should be emphasized that the term "comprising / including" as used herein refers to the presence of a feature, part, step, or component, but does not exclude the presence or addition of one or more other features, parts, steps, or components. Attached Figure Description

[0068] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances. In the drawings:

[0069] Figure 1 A schematic diagram of a gas-fired water heater according to one embodiment of this specification is shown;

[0070] Figure 2 A schematic diagram of a gas-fired water heater according to one embodiment of this specification is shown;

[0071] Figure 3 A schematic diagram of a gas-fired water heater according to one embodiment of this specification is shown;

[0072] Figure 4 A schematic diagram of a gas-fired water heater according to one embodiment of this specification is shown;

[0073] Figure 5 A schematic diagram of a gas-fired water heater according to one embodiment of this specification is shown;

[0074] Figure 6 A schematic diagram of a gas-fired water heater according to one embodiment of this specification is shown;

[0075] Figure 7 A flowchart of a gas-fired water heater control method according to one embodiment of this specification is shown;

[0076] Figure 8 A flowchart of a gas-fired water heater control method according to one embodiment of this specification is shown;

[0077] Figure 9 A schematic diagram of a heating system according to one embodiment of this specification is shown.

[0078] The reference numerals in the above figures are as follows:

[0079] 1. Heating system; 2. Municipal heating;

[0080] 10. Gas-fired hot water unit; 101. First heat exchanger; 102. Burner; 103. First pipeline; 104. Second pipeline; 105. First connecting pipe; 106. Second connecting pipe; 107. Circulating pump; 108. First flow regulating device; 180. Three-way flow regulating valve; 181. First valve; 182. Second valve; 109. First connecting part; 110. Second connecting part; 111. Second heat exchanger; 1111. First flow channel; 1112. Second flow channel; 112. Second flow regulating device; 113. First temperature sensor; 114. Second temperature sensor; 115. Third temperature sensor;

[0081] 20. Indoor heating equipment;

[0082] 30. External heat source; 301. First connection port; 302. Second connection port; 303. Third heat exchanger; 331. First water flow path; 332. Second water flow path;

[0083] 40. Domestic water supply system. Detailed Implementation

[0084] The principles and spirit of this specification will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are given merely 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 disclosure more thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art.

[0085] Those skilled in the art will recognize that the embodiments described in this specification can be implemented as a system, apparatus, method, or computer program product. Therefore, the disclosure of this specification can be specifically implemented in the following forms: entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0086] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to 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.

[0087] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this specification. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0088] This specification provides a method for controlling a gas-fired water heater. Figures 1 to 6 Schematic diagrams of gas-fired water heating devices in some embodiments of this specification are shown. For example... Figures 1 to 6 As shown, the gas-fired water heater may include: a first heat exchanger 101, a burner 102, a first pipeline 103 and a second pipeline 104, a first connecting pipe 105 and a second connecting pipe 106, a circulating pump 107 and a first flow regulating device 108.

[0089] The burner 102 is used for gas combustion. In one embodiment, the burner 102 and the first heat exchanger 101 can be arranged opposite each other and the burner 102 can supply heat energy to the first heat exchanger 101. The burner 102 can be in a combustion state and an off state; in the combustion state, it is used to heat the first heat exchanger 101. The first heat exchanger 101 heats the water flowing through it under the heat energy supplied by the burner 102, thereby obtaining hot water to meet the demand. Alternatively, as... Figures 1 to 6As shown, the first heat exchanger 101 can be located above the burner 102, and the high-temperature flue gas generated by combustion in the burner 102 flows through the first heat exchanger 101. The entire burner 102 extends generally in a horizontal direction, and the first heat exchanger 101 can also extend generally in the same horizontal direction as the burner 102.

[0090] The first pipe 103 is used to transport at least a portion of the water flowing out of the outlet of the first heat exchanger 101 to the indoor heating equipment 20. The second pipe 104 is used to return the water flowing through the indoor heating equipment 20 to the inlet of the first heat exchanger 101. At least a portion of the water flowing out of the outlet of the first heat exchanger 101 flows into the indoor heating equipment 20 via the first pipe 103, and then flows back to the first heat exchanger 101 via the second pipe 104, in order to meet the user's indoor heating needs.

[0091] Both the first connecting pipe 105 and the second connecting pipe 106 are connected to the second pipe 104. The first connecting pipe 105 is located upstream of the second connecting pipe 106. The first connecting pipe 105 is used to lead at least a portion of the water flowing into the second pipe 104 to an external heat source 30 for heating. The second connecting pipe 106 is used to allow water heated by the external heat source 30 to flow into the second pipe 104. In this embodiment, heating the water flowing into the external heat source 30 can refer to heat exchange between the external heat source 30 and the water flowing into the external heat source 30. In one embodiment, the external heat source 30 heats the water flowing into the external heat source, causing the water flowing out of the external heat source to have a higher temperature than the water flowing into the external heat source. In another embodiment, the external heat source 30 absorbs heat from the water flowing into the external heat source, causing the water flowing out of the external heat source to have a lower temperature than the water flowing into the external heat source.

[0092] The first connecting pipe 105 and the second pipe 104 can be connected by the first connecting part 109. The second connecting pipe 106 and the second pipe 104 can be connected by the second connecting part 110. The first connecting part 109 and the second connecting part 110 can be a tee joint.

[0093] A circulation pump 107 can be installed on either the first pipe 103 or the second pipe 104. The circulation pump 107 can be used to drive water flowing from the outlet of the indoor heating equipment 20 into the second pipe 104, through the first heat exchanger 101, and then from the first pipe 103 to the inlet of the indoor heating equipment 20. For example, as shown... Figures 1 to 6 As shown, the pump can be installed on the second pipeline 104.

[0094] The first flow regulating device 108 can be used to regulate the water flow rate to the first connecting pipe 105. In some embodiments of this specification, the first flow regulating device 108 can be disposed on the first connecting part 109, the second connecting part 110, the first connecting pipe 105, and / or the second connecting pipe 106. That is, the first flow regulating device 108 can regulate the flow rate of water in the second pipe 104 into the external heat source 30. This regulation can include gradually increasing or decreasing, or opening and closing. By regulating the water flow rate to the first connecting pipe 105 through the first flow regulating device 108, the water temperature in the first pipe 103 or the second pipe 104 can be regulated, thereby regulating the water temperature flowing into the indoor heating equipment 20 connected to the first pipe 103 and the second pipe 104.

[0095] like Figure 6 As shown in some embodiments of this specification, the gas-fired water heater 10 further includes a second heat exchanger 111. The second heat exchanger 111 has a first flow channel 1111 and a second flow channel 1112 that are isolated from each other. The inlet of the first flow channel 1111 is connected to a first pipe 103 so that at least a portion of the water in the first pipe 103 can flow into the inlet of the first flow channel 1111. The outlet of the first flow channel 1111 is connected to a second pipe 104 so that water flowing out of the outlet of the first flow channel 1111 can flow into the second pipe 104. The second flow channel 1112 can be connected to a domestic water supply device 40 for circulating domestic water. The water flowing through the first flow channel 1111 and the water flowing through the second flow channel 1112 can exchange heat. By providing the second heat exchanger 111, the gas-fired water heater 10 can heat domestic water to meet the user's hot water needs.

[0096] In some embodiments of this specification, the gas-fired water heater 10 further includes a second flow regulating device 112. The second flow regulating device 112 is used to direct water flowing into the first pipe 103 to the inlet of the indoor heating equipment 20 and / or the inlet of the first flow channel 1111. The second flow regulating device 112 can regulate the flow rate of water flowing from the first pipe 103 to the indoor heating equipment 20 and / or the first flow channel 1111. This regulation can include gradually increasing or decreasing the flow rate, or it can include opening and closing the flow channel.

[0097] In some embodiments of this specification, the circulation pump 107 is located upstream of the first connecting pipe 105 or downstream of the second connecting pipe 106. In this embodiment, the circulation pump 107 can not only drive the water flowing from the heating water return port into the second pipe 104 to flow through the first heat exchanger 101 and then from the first pipe 103 to the heating water outlet, but also drive the water in the second pipe 104 to flow through the first connecting pipe 105 into the external heat source 30 and then back into the second pipe 104 through the second connecting pipe 106.

[0098] like Figures 1 to 6 As shown in some embodiments of this specification, the gas-fired water heater 10 further includes a first temperature sensor 113, a second temperature sensor 114, and / or a third temperature sensor 115. The first temperature sensor 113 is disposed on a portion of the second pipe 104 upstream of the first connecting pipe 105. The temperature detected by the first temperature sensor 113 can be used as the heating return water temperature of the gas-fired water heater 10.

[0099] The second temperature sensor 114 is installed on the second pipe 104 downstream of the second connecting pipe 106 or at the inlet of the first heat exchanger 101. The temperature detected by the second temperature sensor 114 is the inlet water temperature of the first heat exchanger 101.

[0100] The third temperature sensor 115 is installed at the outlet of the first heat exchanger 101 or on the first pipeline 103. The temperature detected by the third temperature sensor 115 is the outlet water temperature of the first heat exchanger 101.

[0101] In some embodiments of this specification, such as Figure 2 and Figure 3 As shown, the first flow regulating device 108 may include a three-way flow regulating valve 180. For example... Figure 2 As shown, the three-way flow regulating valve 180 can be located at the first connecting portion 109 between the first connecting pipe 105 and the second pipe 104. In some embodiments of this specification, such as Figure 3 As shown, the three-way flow regulating valve 180 can be installed at the second connection 110 between the second connecting pipe 106 and the second pipeline 104. The three-way flow regulating valve can regulate the flow rate of water in the second pipeline 104 into the external heat source 30 via the first connecting pipe 105. This regulation can include gradually increasing or decreasing the flow rate, or it can simply include opening and closing the valve.

[0102] like Figure 4 As shown, in some embodiments of this specification, the first flow regulating device 108 may include a first valve 181, which is disposed on the first connecting pipe 105 or the second connecting pipe 106. By adjusting the first valve 181, the flow rate of water flowing from the second pipe 104 into the external heat source 30 can be adjusted. This adjustment may include gradually increasing or decreasing, or it may simply include opening and closing.

[0103] like Figure 5As shown, in some embodiments of this specification, the first flow regulating device 108 may further include a second valve 182. The second valve 182 is disposed on a portion of the second pipe 104 between the first connecting portion 109 and the second connecting portion 110. The first connecting portion 109 is the connection between the first connecting pipe 105 and the second pipe 104. The second connecting portion 110 is the connection between the second connecting portion 110 and the second pipe 104. By adjusting the second valve 182, the water flow rate directly returning to the first heat exchanger 101 from the second pipe 104 can be adjusted, thereby indirectly adjusting the water flow rate into the external heat source 30. This adjustment may include gradually increasing or decreasing, or it may simply involve opening and closing.

[0104] Figure 7 A flowchart of a gas-fired water heater control method according to one embodiment of this specification is shown. While this specification provides method operation steps or apparatus structures as illustrated in the following embodiments or figures, more or fewer operation steps or module units may be included in the method or apparatus based on conventional or non-inventive effort. In steps or structures where there is no logically necessary causal relationship, the execution order of these steps or the module structure of the apparatus is not limited to the execution order or module structure described in the embodiments and figures of this specification. When the method or module structure is applied in actual devices or end products, it can be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment, or even a distributed processing environment) according to the method or module structure shown in the embodiments or figures.

[0105] Specifically, such as Figure 7 As shown, the control method for a gas-fired hot water device provided in one embodiment of this specification may include the following steps.

[0106] Step S701: When the gas water heater is in dual-source heating mode, control the first flow regulating device so that at least part of the water flows to the first connecting pipe; control the burner to start combustion.

[0107] The control method in this embodiment can be applied to the gas-fired water heater described in any of the above embodiments. The gas-fired water heater can have a dual-source heating mode. In the dual-source heating mode, the burner and the external heat source can work together to achieve heating.

[0108] In one embodiment, the gas water heater may be equipped with a mode selection control, allowing the user to select the operating mode of the gas water heater. When the user selects the dual-source heating mode, the gas water heater enters the dual-source heating mode.

[0109] In another embodiment, trigger conditions can be preset, and the gas water heater enters dual-source heating mode when the trigger conditions are met. In one embodiment, the trigger conditions are met if the external heat source is turned on and a user's heating command is received. In another embodiment, the trigger conditions are met if the external heat source is turned on and the temperature of the heat exchange medium in the external heat source is higher than a preset temperature, and a user's heating command is received.

[0110] When the gas-fired water heater is in dual-source heating mode, the first flow regulating device can be controlled to direct at least a portion of the water flow to the first connecting pipe. The burner can also be controlled to start combustion. In other words, when the gas-fired water heater is in dual-source heating mode, the first flow regulating device can be controlled to direct at least a portion of the water flowing from the first heat exchanger through the indoor heating equipment into the second pipe, then into the first connecting pipe, and after entering the external heat source, it flows back to the first heat exchanger via the second connecting pipe, allowing at least a portion of the water to exchange heat with the external heat source. The burner then heats the water.

[0111] Step S702: When the burner continues to burn for a first preset time period, if the heating return water temperature of the gas water heater is greater than the inlet water temperature of the first heat exchanger, then the heating outlet water set temperature of the gas water heater is controlled to decrease.

[0112] During the first preset combustion period of the burner, it can be determined whether the heating return water temperature of the gas-fired water heater is greater than the inlet water temperature of the first heat exchanger. The heating return water temperature of the gas-fired water heater can refer to the temperature of the heating water flowing from the indoor heating equipment to the first connecting pipe, i.e., the outlet water temperature of the indoor heating equipment, which is the water temperature before flowing into the external heat source. The inlet water temperature of the first heat exchanger can refer to the water temperature flowing into the inlet of the first heat exchanger, i.e., the water temperature after flowing out of the external heat source, or the water temperature after mixing the water flowing out of the external heat source with the water flowing directly from the indoor heating equipment. The heating return water temperature and the inlet water temperature of the first heat exchanger can be obtained. For example, Figures 1 to 6 As shown, the heating return water temperature can be the temperature detected by the first temperature sensor of the gas-fired water heater. The inlet water temperature of the first heat exchanger can be the temperature detected by the second temperature sensor of the gas-fired water heater.

[0113] If the return water temperature of the gas-fired water heater is higher than the inlet water temperature of the first heat exchanger, it indicates that at least part of the water temperature decreases after flowing through the external heat source. In other words, the heating water cannot utilize the energy from the external heat source. In this case, the heating setpoint temperature of the gas-fired water heater can be lowered. Then, the burner can be controlled based on the lowered heating setpoint temperature. Therefore, the outlet water temperature of the first heat exchanger can be lowered, which in turn lowers the return water temperature of the gas-fired water heater, thus lowering the temperature of the water flowing into the external heat source, making it easier for the water flowing into the external heat source to absorb heat from it.

[0114] The heating water temperature and the inlet water temperature of the first heat exchanger are determined only after the burner has been burning continuously for a first preset time period. This is because the temperature of the water flowing out of the first heat exchanger becomes more stable after the burner has been burning for a period of time, making it easier to determine the temperature. In one embodiment, the first preset time period can be set to 30 seconds to two minutes, for example, it can be set to 1 minute.

[0115] In some embodiments of this specification, if the temperature of the heating return water is lower than the inlet water temperature of the first heat exchanger, it means that the energy of the external heat source can be used to provide heating for the user. At this time, the set temperature of the heating water outlet can be kept constant, and the first flow regulating device can be controlled so that at least part of the water flows to the first connecting pipe and enters the external heat source for heating.

[0116] In the above embodiments, the gas-fired water heater has a dual-source heating mode. In this mode, both the burner and the external heat source can heat the heating water. The first flow regulating device can be controlled to direct at least a portion of the water to the first connecting pipe, and the burner can be activated. If, during a first preset burning period, the return water temperature of the gas-fired water heater is higher than the inlet water temperature of the first heat exchanger, it indicates that the external heat source cannot heat the water flowing into it; that is, the heat from the external heat source cannot be used to heat the user. In this case, the set temperature of the gas-fired water heater's outlet water is lowered, reducing the water temperature flowing out of the first heat exchanger. This, in turn, lowers the return water temperature of the gas-fired water heater, thus reducing the temperature of the water flowing into the external heat source. This allows for full utilization of the external heat source's energy, saving gas costs and providing energy-efficient and comfortable heating for the user.

[0117] In some embodiments of this specification, the method may further include: when the burner is continuously burning for a first preset time period, if the heating return water temperature of the gas-fired water heater is greater than the inlet water temperature of the first heat exchanger of the gas-fired water heater, then controlling the first flow regulating device to reduce the water flow rate to the first connecting pipe. In this embodiment, if the heating return water temperature of the gas-fired water heater is greater than the inlet water temperature of the first heat exchanger when the burner is continuously burning for a first preset time period, it indicates that the external heat source cannot provide heat to the heating water. At this time, the first flow regulating device can be controlled to reduce the water flow rate to the first connecting pipe to reduce heat loss of the heating water and reduce costs.

[0118] In some embodiments of this specification, controlling the first flow regulating device to reduce the water flow rate to the first connecting pipe may include controlling the first flow regulating device to make the water flow rate to the first connecting pipe zero. In this embodiment, when it is determined that the external heat source cannot provide heat to the heating water, directly controlling the water not to flow to the external heat source can minimize the heat loss of the heating water, thereby reducing costs and improving the user experience.

[0119] In some embodiments of this specification, when the burner continues to burn for a first preset time period, if the temperature difference between the heating return water temperature and the inlet water temperature of the first heat exchanger is greater than or equal to the first preset temperature difference, the heating outlet water setting temperature of the gas-fired water heater is controlled to decrease; the first preset temperature difference is greater than zero.

[0120] In this embodiment, the heating outlet temperature of the gas water heater is lowered only if the difference between the heating return water temperature and the inlet water temperature of the first water heater is greater than a first preset temperature difference. In this embodiment, the first preset temperature difference can be set to 1°C to 3°C. For example, the first preset temperature difference can be set to 1.5°C. On the one hand, considering heat loss in the pipes, determining that heat from an external heat source cannot be utilized is more accurate only when the heating return water temperature is higher than the inlet water temperature of the first water heater by the first preset temperature difference. On the other hand, lowering the heating outlet temperature only when the heating return water temperature is higher than the inlet water temperature of the first water heater by the first preset temperature difference better ensures user heating comfort. Through this method, costs can be reduced while meeting user comfort, achieving a balance between economy and comfort.

[0121] In some embodiments of this specification, the method further includes: when the temperature difference between the outlet water temperature of the first heat exchanger of the gas-fired water heater and the set temperature of the heating outlet water is greater than or equal to a second preset temperature difference, controlling the burner to stop combustion; the second preset temperature difference is greater than zero.

[0122] In this embodiment, the burner stops combustion when the temperature difference between the outlet water temperature of the first heat exchanger of the gas-fired water heater and the set heating outlet water temperature is greater than or equal to a second preset temperature difference. The second preset temperature difference is greater than zero, and can be set to, for example, 5°C to 10°C, or even 8°C. In this embodiment, the set heating outlet water temperature is the heating temperature set by the user. Generally, combustion stops when the outlet water temperature of the first heat exchanger is higher than the second preset temperature difference of the set heating outlet water temperature, allowing the indoor temperature to meet the user's needs as quickly as possible, thus improving the user's heating comfort.

[0123] In some embodiments of this specification, controlling the heating outlet water set temperature of the gas-fired water heater to decrease includes: controlling the heating outlet water set temperature of the gas-fired water heater to decrease by a third preset temperature difference; the third preset temperature difference is greater than zero. In this embodiment, when the heating return water temperature is higher than the inlet water temperature of the first heat exchanger, the heating outlet water set temperature can be controlled to decrease by a preset temperature difference. In this way, the adjusted temperature can be determined conveniently and quickly.

[0124] In some embodiments of this specification, the third preset temperature difference is 1°C to 10°C. In one embodiment, the first preset temperature difference can be set to 3°C. For example, if the heating outlet water set temperature is 65°C, and after the burner has been burning for a first preset time period, the heating return water temperature is higher than the inlet water temperature of the first heat exchanger, then the heating outlet water set temperature is set to 62°C.

[0125] In some embodiments of this specification, controlling the reduction of the set temperature of the heating outlet water of the gas-fired water heater may include: controlling the reduction of the set temperature of the heating outlet water of the gas-fired water heater based on the temperature difference between the heating return water temperature and the inlet water temperature of the first heat exchanger. In one embodiment, the greater the temperature difference between the heating return water temperature and the inlet water temperature of the first heat exchanger, that is, the lower the temperature of the heat exchange medium in the external heat source, the greater the reduction of the set temperature of the heating outlet water of the gas-fired water heater. In another embodiment, multiple temperature difference thresholds are preset, and the temperature difference value that the set temperature of the heating outlet water heater needs to be reduced is determined based on the range of the temperature difference between the heating return water temperature and the inlet water temperature of the first heat exchanger. For example, if the temperature difference between the heating return water temperature and the inlet water temperature of the first heat exchanger is greater than a first preset temperature difference threshold, then the temperature difference value that the set temperature of the heating outlet water heater needs to be reduced is determined as the first value. If the temperature difference between the heating return water temperature and the inlet water temperature of the first heat exchanger is less than or equal to a first preset temperature difference threshold and greater than a second preset temperature difference threshold, then the temperature difference that needs to be reduced for the set heating outlet temperature of the gas-fired water heater is determined as the second value. If the temperature difference between the heating return water temperature and the inlet water temperature of the first heat exchanger is less than or equal to the second preset temperature difference threshold, then the temperature difference that needs to be reduced for the set heating outlet temperature of the gas-fired water heater is determined as the third value. The first preset temperature difference threshold is greater than the second preset temperature difference threshold. The first value is greater than the second value, and the second value is greater than the third value. By determining the temperature difference that needs to be reduced for the set heating outlet temperature based on the heating return water temperature and the inlet water temperature of the first heat exchanger, it is possible to utilize external heat sources for indoor heating more quickly and effectively, further saving costs.

[0126] In some embodiments of this specification, after controlling the burner to stop combustion, the method may further include: when the water temperature in the pipeline of the gas-fired water heater is lower than the set temperature of the heating outlet water, controlling the first flow regulating device to cause at least a portion of the water to flow to the first connecting pipe; controlling the burner to start combustion; the pipeline of the gas-fired water heater includes: the first pipeline, the second pipeline, the first connecting pipe and / or the second connecting pipe.

[0127] In this embodiment, when the water temperature in the gas-fired water heater's pipeline is lower than the set heating outlet temperature, it indicates that the current heating water temperature cannot meet the user's heating needs. Therefore, the first flow regulating device can be controlled to direct at least a portion of the water to the first connecting pipe, controlling the burner to start combustion and improve the user's heating comfort. The gas-fired water heater's pipeline includes: the first pipeline, the second pipeline, the first connecting pipe, and / or the second connecting pipe. Therefore, the water temperature in the pipeline can be determined based on the temperatures detected by the first temperature sensor, the second temperature sensor, and / or the third temperature sensor. During the burner's continuous combustion for a first preset time period, if the heating return water temperature is greater than the inlet water temperature of the first heat exchanger, the set heating outlet temperature of the gas-fired water heater is controlled to decrease. Furthermore, the first flow regulating device can also be controlled to reduce the water flow to the first connecting pipe. If the heating return water temperature is not greater than the inlet water temperature of the first heat exchanger, the set heating outlet temperature is not adjusted, and at least a portion of the water continues to flow to the first connecting pipe.

[0128] In some embodiments of this specification, when the temperature difference between the set temperature of the heating outlet water and the water temperature in the pipeline of the gas-fired water heater is greater than or equal to the difference of a fourth preset temperature difference, the first flow regulating device is controlled so that at least part of the water flows to the first connecting pipe; the burner is controlled to start combustion; and the fourth preset temperature difference is greater than zero.

[0129] In this embodiment, the first flow regulating device is controlled only when the set temperature of the heating outlet water is greater than the water temperature in the pipeline and the temperature difference between the two is greater than or equal to a fourth preset temperature difference. This ensures that at least a portion of the water flows to the first connecting pipe, and the burner is restarted. The fourth preset temperature difference can be set to 2°C to 10°C, for example, 5°C. If the water temperature in the gas-fired water heater drops to 60°C when the set temperature of the heating outlet water is 65°C, the burner is restarted. By controlling combustion only when the water temperature in the gas-fired water heater pipeline is lower than the set temperature of the heating outlet water by a preset temperature difference, costs can be effectively reduced while ensuring comfort.

[0130] In some embodiments of this specification, after controlling the heating outlet water set temperature of the gas water heater to decrease, the method may further include: when the heating outlet water set temperature is lower than the minimum set temperature of the gas water heater, using the minimum set temperature as the heating outlet water set temperature.

[0131] In this embodiment, after the set temperature of the heating outlet water is reduced, if the reduced set temperature is lower than the minimum set temperature, the minimum set temperature can be used as the set temperature to prevent the room temperature from dropping too much or too quickly. The minimum set temperature can be the lowest temperature preset at the factory for the gas water heater, for example, it can be set to 40℃ to 55℃, such as 50℃. For example, if the reduced set temperature is 45℃, since this temperature is lower than the minimum set temperature of 50℃, the set temperature can be set to 50℃. By using this method, when the reduced set temperature is too low, the minimum set temperature can be used as the set temperature to ensure a good heating experience for the user, while also effectively reducing costs.

[0132] In some embodiments of this specification, after controlling the heating outlet water set temperature of the gas water heater to decrease, the method may further include: when the heating outlet water set temperature is lower than the minimum set temperature of the gas water heater, using the maximum set temperature of the gas water heater as the heating outlet water set temperature; or, when the heating outlet water set temperature is lower than the minimum set temperature of the gas water heater, using the initial heating outlet water set temperature of the gas water heater as the heating outlet water set temperature.

[0133] In this embodiment, if the reduced heating outlet water temperature is lower than the minimum set temperature, the room temperature will drop too much and too quickly. Therefore, the maximum set temperature or the initial heating outlet water temperature can be used as the heating outlet water temperature. The minimum set temperature can be the lowest temperature preset at the factory for the gas water heater, for example, it can be set to 40℃ to 55℃, such as 50℃. The maximum set temperature can be the highest temperature preset at the factory for the gas water heater, for example, it can be set to 65℃ to 75℃, such as 70℃. The initial heating outlet water temperature can be the user-set heating outlet water temperature, which can be the minimum set temperature, the maximum set temperature, or a temperature between the minimum and maximum set temperatures. For example, when the reduced heating outlet water temperature is 45℃, since this temperature is lower than the minimum set temperature of 50℃, the heating outlet water temperature can be set to the maximum set temperature of 70℃ or the initial heating outlet water temperature of 65℃. By using the above method, when the reduced heating outlet water setting temperature is too low, the maximum setting temperature or the initial heating outlet water setting temperature can be used as the heating outlet water setting temperature, which can improve the user's heating experience and ensure user comfort.

[0134] Please refer to Figure 8 The diagram illustrates flowcharts of control methods for gas-fired water heating devices in some embodiments of this specification. For example... Figure 8As shown, the control method for the gas-fired hot water device in this embodiment may include the following steps.

[0135] Step 1: The gas-fired water heater enters the dual-source heating mode.

[0136] Step 2: Control the first flow regulating device so that at least a portion of the water flows into the first connecting pipe.

[0137] Step 3: Control the burner to start combustion.

[0138] Step 4: After combustion continues for a first preset time period, determine whether T1 is greater than T2 + ΔT1. Where T1 is the heating return water temperature, T2 is the inlet water temperature of the first heat exchanger, and ΔT1 is the preset temperature difference. If yes, proceed to step 5; otherwise, proceed to step 8.

[0139] Step 5: Control Tset to decrease ΔT2, thereby controlling the first flow regulating device to reduce the water flow rate to the first connecting pipe. ΔT2 is the preset temperature difference.

[0140] Step 6: Determine if Tset is less than Tmin. If yes, proceed to step 7; otherwise, proceed to step 8.

[0141] Step 7: Use Tmin, Tmax, or T0 as Tset. T0 is the initial heating outlet water set temperature.

[0142] Step 8: Determine if T3 is greater than Tset + ΔT3. Where Tset is the set temperature of the heating outlet water, and ΔT3 is the preset temperature difference. If yes, proceed to step 9; otherwise, continue with step 8.

[0143] Step 9: Control the burner to stop combustion.

[0144] Step 10: Determine if T4 is lower than Tset - ΔT4, where ΔT4 is the preset temperature difference. If yes, return to step 2; otherwise, continue to step 10.

[0145] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. For details, please refer to the foregoing descriptions of the relevant processing embodiments; they will not be repeated here.

[0146] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0147] This specification also provides a controller, which may specifically include an input device, a processor, and a memory. The memory stores processor-executable instructions. When the processor executes the instructions, it implements the steps of the gas-fired water heater control method described in any of the above embodiments.

[0148] In this embodiment, the input device can specifically be one of the main devices for information exchange between the user and the computer system. The input device may include a keyboard, mouse, camera, scanner, light pen, handwriting input tablet, voice input device, etc.; the input device is used to input raw data and programs for processing these data into the computer. The input device can also receive data transmitted from other modules, units, and devices. The processor can be implemented in any suitable manner. For example, the processor can take the form of a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers, etc. The memory can specifically be a memory device used to store information in modern information technology. The memory can include multiple layers; in digital systems, anything that can store binary data can be considered memory; in integrated circuits, a circuit without physical form but with storage function is also called memory, such as RAM, FIFO, etc.; in a system, a storage device with physical form is also called memory, such as a memory stick, TF card, etc.

[0149] In this embodiment, the specific functions and effects implemented by the controller can be explained by comparison with other embodiments, and will not be repeated here.

[0150] This specification also provides a computer storage medium based on a gas-fired water heater control method, wherein the computer storage medium stores computer program instructions that, when executed, implement the steps of the gas-fired water heater control method described in any of the above embodiments.

[0151] 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 according to standards specified in the communication protocol for network connection communication.

[0152] In this embodiment, the specific functions and effects implemented by the program instructions stored in the computer storage medium can be explained by comparison with other embodiments, and will not be repeated here.

[0153] This specification also provides a gas-fired water heating device, comprising: a controller as described in any of the above embodiments; a first heat exchanger; a burner for heating the first heat exchanger; a first pipeline and a second pipeline, the first pipeline for conveying at least a portion of the water flowing out of the outlet of the first heat exchanger to an indoor heating device, and the second pipeline for returning water flowing through the indoor heating device to the inlet of the first heat exchanger; a first connecting pipe and a second connecting pipe connected to the second pipeline, the first connecting pipe being located upstream of the second connecting pipe, the first connecting pipe for leading at least a portion of the water flowing into the second pipeline to an external heat source, and the second connecting pipe for flowing water heated by the external heat source into the second pipeline; a circulation pump, the circulation pump being disposed on the first pipeline or the second pipeline, the circulation pump being used to drive water flowing from the outlet of the indoor heating device into the second pipeline to flow through the first heat exchanger and then from the first pipeline to the inlet of the indoor heating device; and a first flow regulating device for regulating the water flow rate to the first connecting pipe.

[0154] This specification also provides a heating system in its embodiments. Please refer to... Figure 9 This diagram illustrates the structure of the heating system as described in the embodiments of this specification. Figure 9 As shown, the heating system 1 includes: a gas-fired water heater 10 and an indoor heating system 20 as described in any of the above embodiments. The specific implementation of the gas-fired water heater 10 can be referred to the relevant descriptions in any of the above embodiments. The inlet of the indoor heating system 20 is connected to the outlet of the first heat exchanger 101 via a first pipe 103. The outlet of the indoor heating system 20 is connected to the inlet of the first heat exchanger 101 via a second pipe 104.

[0155] like Figure 9As shown in some embodiments of this specification, the heating system 1 further includes an external heat source 30. The external heat source 30 has a first connecting port 301 connected to the first connecting pipe 105 and a second connecting port 302 connected to the second connecting pipe 106. Water flowing out of the first connecting pipe 105 can flow into the first connecting port 301, be heated by the external heat source 30, and then flow through the second connecting port 302 to the second connecting pipe 106.

[0156] In some embodiments of this specification, the external heat source 30 may include a third heat exchanger 303. The third heat exchanger 303 may include a first water flow path 331 and a second water flow path 332. The first connection port 301 and the second connection port 302 are connected to the first water flow path 331. The second water flow path 332 is used to connect to the municipal heating system 2, and municipal heating water flows through the second water flow path 332. The water flowing through the first water flow path 331 and the water flowing through the second water flow path 332 exchange heat. By providing the third heat exchanger 303, the heating water can be heated using the municipal heating system 2. Meanwhile, compared to the existing technology that directly connects the municipal heating system 2 to the gas water heater 10, in this embodiment, by setting a third heat exchanger 303, the heat of the municipal heating water can be utilized by heat exchange. Therefore, the problem of water blockage caused by the municipal heating water directly entering the heat exchanger and water circuit inside the gas water heater can be avoided, thereby extending the service life of the gas water heater and improving the user experience.

[0157] In some embodiments of this specification, the third heat exchanger 303 is disposed in a predetermined location indoors. By disposing of the third heat exchanger 303 in a predetermined location indoors, it is convenient to adjust, install, maintain, and use the third heat exchanger 303.

[0158] Obviously, those skilled in the art will understand that the modules or steps of the embodiments described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby storing them in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those presented herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the embodiments of this specification are not limited to any particular combination of hardware and software.

[0159] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this specification should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents.

[0160] The above description is merely a preferred embodiment of this specification and is not intended to limit this specification. Various modifications and variations can be made to the embodiments described herein by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

Claims

1. A gas water heating apparatus control method characterized by, The gas-fired hot water device includes: First heat exchanger; A burner for heating the first heat exchanger; A first pipeline and a second pipeline, wherein the first pipeline is used to transport at least a portion of the water flowing out of the outlet of the first heat exchanger to the indoor heating equipment, and the second pipeline is used to return the water flowing through the indoor heating equipment to the inlet of the first heat exchanger. A first connecting pipe and a second connecting pipe are connected to the second pipeline. The first connecting pipe is located upstream of the second connecting pipe. The first connecting pipe is used to lead at least a portion of the water flowing into the second pipeline to an external heat source. The second connecting pipe is used to allow water heated by the external heat source to flow into the second pipeline. A circulation pump is installed on the first pipeline or the second pipeline. The circulation pump can be used to drive water flowing from the outlet of the indoor heating equipment into the second pipeline, through the first heat exchanger, and then from the first pipeline to the inlet of the indoor heating equipment. A first flow regulating device is used to regulate the water flow rate to the first connecting pipe. The control method includes: When the gas-fired water heater is in dual-source heating mode, the first flow regulating device is controlled so that at least part of the water flows to the first connecting pipe; the burner is controlled to start combustion. When the burner continues to burn for a first preset time period, if the heating return water temperature of the gas water heater is greater than the inlet water temperature of the first heat exchanger, the heating outlet water set temperature of the gas water heater is controlled to decrease.

2. The control method for a gas-fired hot water device according to claim 1, characterized in that, When the burner continues to burn for a first preset time period, if the temperature difference between the heating return water temperature and the inlet water temperature of the first heat exchanger is greater than or equal to the first preset temperature difference, the heating outlet water setting temperature of the gas water heater is controlled to decrease; the first preset temperature difference is greater than zero.

3. The gas water heating device control method according to claim 1, characterized by, Also includes: When the temperature difference between the outlet water temperature of the first heat exchanger of the gas-fired water heater and the set temperature of the heating outlet water is greater than or equal to the second preset temperature difference, the burner is controlled to stop combustion; the second preset temperature difference is greater than zero.

4. The gas water heating device control method according to claim 1, characterized by, Controlling the reduction of the set temperature of the heating outlet water of the gas-fired water heater includes: The heating outlet water temperature of the gas-fired water heater is controlled to decrease by a third preset temperature difference; the third preset temperature difference is greater than zero.

5. The control method for a gas-fired hot water device according to claim 4, characterized in that, The third preset temperature difference is 1°C to 10°C.

6. The gas water heating device control method according to claim 1, wherein Also includes: When the burner continues to burn for a first preset time period, if the heating return water temperature of the gas water heater is greater than or equal to the inlet water temperature of the first heat exchanger of the gas water heater, the first flow regulating device is controlled to reduce the water flow rate to the first connecting pipe.

7. The gas water heating device control method according to claim 6, characterized by, Controlling the first flow regulating device to reduce the water flow rate to the first connecting pipe includes: Control the first flow regulating device so that the water flow to the first connecting pipe is zero.

8. The gas water heating device control method according to claim 1, characterized by, After controlling the burner to stop combustion, the following is also included: When the water temperature in the pipeline of the gas-fired water heater is lower than the set temperature of the heating outlet water, the first flow regulating device is controlled so that at least part of the water flows to the first connecting pipe; the burner is controlled to start combustion; the pipeline of the gas-fired water heater includes: the first pipeline, the second pipeline, the first connecting pipe and / or the second connecting pipe.

9. The control method for a gas-fired hot water device according to claim 8, characterized in that, When the temperature difference between the set temperature of the heating outlet water and the water temperature in the pipeline of the gas-fired water heater is greater than or equal to the fourth preset temperature difference, the first flow regulating device is controlled so that at least part of the water flows to the first connecting pipe; the burner is controlled to start combustion; and the fourth preset temperature difference is greater than zero.

10. The gas water heating device control method according to claim 1, characterized by, After controlling the heating outlet water set temperature of the gas-fired water heater to decrease, the method further includes: When the set temperature of the heating outlet water is lower than the minimum set temperature of the gas-fired water heater, the minimum set temperature shall be used as the set temperature of the heating outlet water.

11. The control method for a gas-fired hot water device according to claim 1, characterized in that, After controlling the heating outlet water set temperature of the gas-fired water heater to decrease, the method further includes: When the set temperature of the heating outlet water is lower than the minimum set temperature of the gas-fired water heater, the maximum set temperature of the gas-fired water heater shall be used as the set temperature of the heating outlet water; or... When the set temperature of the heating outlet water is lower than the minimum set temperature of the gas-fired water heater, the initial set temperature of the heating outlet water of the gas-fired water heater shall be used as the set temperature of the heating outlet water.

12. The control method for a gas-fired hot water device according to claim 1, characterized in that, The gas-fired hot water device also includes: The second heat exchanger has a first flow channel and a second flow channel that are isolated from each other. The inlet of the first flow channel can be connected to 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. The outlet of the first flow channel can be connected to the second pipeline so that the water flowing out of the outlet of the first flow channel can flow into the second pipeline. The second flow channel is used for circulating domestic water. The water flowing through the first flow channel and the water flowing through the second flow channel can exchange heat.

13. The control method for a gas-fired hot water device according to claim 12, characterized in that, The gas-fired hot water device also includes: The second flow regulating device is used to direct the water flowing into the first pipeline to the inlet of the indoor heating equipment and / or the inlet of the first flow channel.

14. The control method for a gas-fired hot water device according to claim 1, characterized in that, The circulating pump is located upstream of the first connecting pipe or downstream of the second connecting pipe.

15. The control method for a gas-fired hot water device according to claim 1, characterized in that, The first flow regulating device is disposed at the first connection point between the first connecting pipe and the second pipeline, or the first flow regulating device is disposed at the second connection point between the second connecting pipe and the second pipeline; The first flow regulating device is a three-way flow regulating valve.

16. The control method for a gas-fired hot water device according to claim 1, characterized in that, The first flow regulating device includes a first valve, which is disposed on the first connecting pipe or the second connecting pipe.

17. The control method for a gas-fired hot water device according to claim 16, characterized in that, The first flow regulating device further includes a second valve, which is disposed on a portion of the second pipeline between the first connecting part and the second connecting part. The first connecting part is the connecting part between the first connecting pipe and the second pipeline, and the second connecting part is the connecting part between the second connecting part and the second pipeline.

18. A controller, characterized in that, The controller includes a processor and a memory for storing processor-executable instructions, wherein the processor executes the instructions to implement the steps of the gas-fired water heater control method according to any one of claims 1 to 17.

19. A gas-fired hot water device, characterized in that, include: The controller according to claim 18; First heat exchanger; A burner for heating the first heat exchanger; A first pipeline and a second pipeline, wherein the first pipeline is used to transport at least a portion of the water flowing out of the outlet of the first heat exchanger to the indoor heating equipment, and the second pipeline is used to return the water flowing through the indoor heating equipment to the inlet of the first heat exchanger. A first connecting pipe and a second connecting pipe are connected to the second pipeline. The first connecting pipe is located upstream of the second connecting pipe. The first connecting pipe is used to lead at least a portion of the water flowing into the second pipeline to an external heat source. The second connecting pipe is used to allow water heated by the external heat source to flow into the second pipeline. A circulation pump is installed on the first pipeline or the second pipeline. The circulation pump can be used to drive water flowing from the outlet of the indoor heating equipment into the second pipeline, through the first heat exchanger, and then from the first pipeline to the inlet of the indoor heating equipment. A first flow regulating device is used to regulate the water flow rate to the first connecting pipe.

20. A heating system, characterized in that, include: The gas-fired hot water device according to claim 19; An indoor heating device, wherein the inlet of the indoor heating device is connected to the outlet of the first heat exchanger via a first pipe, and the outlet of the indoor heating device is connected to the inlet of the first heat exchanger via a second pipe.

21. The heating system according to claim 20, characterized in that, The heating system also includes: An external heat source has a first connection port connected to the first connecting pipe and a second connection port connected to the second connecting pipe; water flowing out of the first connecting pipe can flow into the first connection port, be heated by the external heat source, and then flow through the second connection port to the second connecting pipe.

22. The heating system according to claim 21, characterized in that, The external heat source includes: The third heat exchanger includes a first water flow path and a second water flow path. The first and second connecting ports are connected to the first water flow path. The second water flow path is used to connect to municipal heating. Municipal heating water flows through the second water flow path. The water flowing through the first water flow path and the water flowing through the second water flow path exchange heat.

23. The heating system according to claim 22, characterized in that, The third heat exchanger is installed at a predetermined location indoors.

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