A gas water heater and a control method thereof

Abstract

The application discloses a gas water heater and a control method thereof, and relates to the technical field of gas water heaters, which can meet the zero-cold-water demand of a user and ensure the normal work of a water purifier. The gas water heater comprises a processor, which is used for determining the installation position of the water purifier and setting a temperature threshold T th ; in the case that the installation position of the water purifier is determined to be a backwater pipeline, it is determined that the temperature threshold T th , the working temperature Tc of the water purifier and the preset heating temperature Ts of the gas water heater satisfy T th <Tc and T th <Ts; a zero-cold-water instruction is received, the waterway temperature of a water inlet joint is obtained according to the zero-cold-water instruction, and if the waterway temperature is less than or equal to the temperature threshold T th , a burner is started to start the zero-cold-water mode. The control method of the gas water heater is used for controlling the above-mentioned gas water heater.

Description

Technical Field

[0001] This invention relates to the field of water heater technology, and in particular to a gas water heater and its control method, computer storage medium, and computer program product. Background Technology

[0002] Gas water heaters are a common household appliance. To use a gas water heater, connect the inlet pipe to the cold water pipe, connect the outlet pipe to the water terminal via the hot water pipe, and simultaneously connect the cold water pipe to the water terminal.

[0003] To achieve zero cold water output from the gas water heater, the hot water pipe can be connected to the cold water pipe, and this connection point should be connected in parallel to the water terminal. A one-way valve should be installed at this connection point, allowing water to flow from the hot water pipe into the cold water pipe. This creates a return water path between the cold water pipe, the hot water pipe, and the one-way valve, thus achieving zero cold water output from the gas water heater.

[0004] However, when a water purifier is connected in series to a cold water pipe and the water purifier is located in the return water pipe, if the temperature of the return water in the return water pipe is too high, it will damage the reverse osmosis membrane in the water purifier, causing the water purifier to malfunction. Summary of the Invention

[0005] This application provides a gas water heater and its control method, which meets the user's need for zero cold water while ensuring the normal operation of the water purifier.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, embodiments of this application provide a gas water heater. The gas water heater includes a shell, a burner, heat exchange pipes, an inlet connector, an outlet connector, and a processor.

[0008] The burner and heat exchange piping are housed within the casing, with the heat exchange piping used for heat exchange with the burner. The water inlet is located outside the casing and is connected to the first end of the heat exchange piping, the cold water pipe, and the water purifier. The water outlet is also located outside the casing and is connected to the second end of the heat exchange piping and the hot water pipe. A one-way valve connects the cold water pipe and the hot water pipe; the one-way valve only allows water to flow from the hot water pipe into the cold water pipe, thus forming a return water pipe consisting of the cold water pipe, the hot water pipe, and the one-way valve.

[0009] The processor is located inside the housing and is used to determine the installation position of the water purifier and set a temperature threshold T based on the installation position. th .

[0010] If it is determined that the water purifier is installed in the return water pipe, the processor is also used to set the temperature threshold T. th The operating temperature Tc of the water purifier and the preset heating temperature Ts of the gas water heater satisfy the following relationship: T th <Tc, and T th <Ts.

[0011] The processor is also used to receive a zero-cold-water command, obtain the water temperature of the inlet connector based on the zero-cold-water command, and determine if the water temperature is less than or equal to a temperature threshold T. th Start the burner to activate the zero-cold-water mode.

[0012] Compared with the prior art, in the gas water heater of this application, the processor can determine the installation location of the water purifier and set the temperature threshold T according to the installation location of the water purifier. th .

[0013] Given that the water purifier is installed in the return water line, it can be determined that a higher temperature in the return water line would damage the reverse osmosis membrane of the water purifier. Therefore, the processor is set with a temperature threshold T. th The operating temperature Tc of the water purifier and the preset heating temperature Ts of the gas water heater must satisfy the following condition: T th <Tc, and T th <Ts.

[0014] The processor receives the zero-cold-water command, obtains the water temperature at the inlet connector based on the command, and then determines whether the water temperature is less than or equal to a temperature threshold T. th The water temperature is less than or equal to the temperature threshold T. th This indicates that the return water temperature in the return water pipe is lower than the preset heating temperature Ts of the gas water heater, meaning the return water needs to be heated to meet the user's zero-cold-water requirement. Simultaneously, the return water temperature is lower than the water purifier's operating temperature Tc, indicating that the return water will not damage the reverse osmosis membrane in the water purifier. At this point, the burner is activated to switch to zero-cold-water mode, ensuring that the gas water heater meets the user's zero-cold-water requirement while also guaranteeing the normal operation of the water purifier.

[0015] In a second scenario, this application also provides a control method for a gas water heater. The control method for the gas water heater includes:

[0016] Determine the installation location of the water purifier, and set a temperature threshold T based on the installation location. th ;

[0017] Assuming the water purifier is installed in the return water pipe, the temperature threshold T is set. thThe operating temperature Tc of the water purifier and the preset heating temperature Ts of the gas water heater satisfy the following relationship: T th <Tc, and T th <Ts;

[0018] Receive a zero-cold-water command, obtain the water circuit temperature of the inlet connector according to the zero-cold-water command, and determine if the water circuit temperature is less than or equal to a temperature threshold T. th Start the burner to activate the zero-cold-water mode.

[0019] Compared with the prior art, the beneficial effects of the control method for gas water heaters provided in this application are the same as those of the gas water heaters described above, and will not be repeated here.

[0020] In a third embodiment, this application also provides a computer-readable storage medium. This computer-readable storage medium includes computer instructions that, when executed on a processor of a gas water heater, cause the processor to perform the control method described above.

[0021] Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the control method for the gas water heater described above, and will not be repeated here.

[0022] In a fourth scenario, this application also provides a computer program product. This computer program product includes computer instructions that, when executed on the processor of a gas water heater, cause the processor to perform the aforementioned control method.

[0023] Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the control method for the gas water heater described above, and will not be repeated here. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a gas water heater in the prior art;

[0026] Figure 2 This is a schematic diagram illustrating the use of gas water heaters in the prior art;

[0027] Figure 3 This is a structural diagram of the gas water heater provided in this application;

[0028] Figure 4 This is one of the schematic diagrams illustrating the use of the gas water heater provided in this application;

[0029] Figure 5 This is the second illustration of the gas water heater provided in this application.

[0030] Figure 6 This application provides a control diagram of a gas water heater.

[0031] Figure 7 One of the flowcharts for the control method of the gas water heater provided in this application;

[0032] Figure 8 The second flowchart illustrates the control method for the gas water heater provided in this application. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In the description of this application, "and / or" is merely a way of describing the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0036] Gas water heaters are a common household appliance. Generally, see [link to relevant documentation]. Figure 1 The gas water heater 1 includes a shell 11, a burner 12, a heat exchange pipe 13, an inlet connector 14, and an outlet connector 15.

[0037] The burner 12 and heat exchange pipe 13 are located inside the shell 11, and the heat exchange pipe 13 is used to exchange heat with the burner 12. The water inlet connector 14 and the water outlet connector 15 are both located outside the shell 11, and the water inlet connector 14 is connected to the first end of the heat exchange pipe 13, and the water outlet connector 15 is connected to the second end of the heat exchange pipe 13.

[0038] See Figure 1 and Figure 2 The gas water heater 1 described above requires the use of a water terminal 2, a cold water pipe 3, and a hot water pipe 4. The outlet of the cold water pipe 3 is connected to both the inlet connector 14 and the water terminal 2. One end of the hot water pipe 4 is connected to the outlet connector 15, and the other end is connected to the water terminal 2. At this time, cold water in the cold water pipe 3 can be delivered to the water terminal 2 to provide cold water to the user. The cold water in the cold water pipe 3 can also enter the heat exchange pipe 13 through the inlet connector 14 to exchange heat with the burner 12, and then flow sequentially through the outlet connector 15 and the hot water pipe 4 to the user terminal to provide hot water to the user.

[0039] Meanwhile, to achieve zero cold water output from the gas water heater 1, the hot water pipe 4 can be connected to the cold water pipe 3. The connection point between the hot water pipe 4 and the cold water pipe 3 is connected in parallel to the water terminal 2, and a one-way valve 5 is installed at the connection point. The one-way valve 5 only allows water to flow from the hot water pipe 4 to the cold water pipe 3. At this time, when the user terminal is in the closed state, the hot water pipe 4, the cold water pipe 3, and the one-way valve 5 form a return water pipeline. The water in the hot water pipe 4 can sequentially enter the heat exchange pipeline 13 through the one-way valve 5, the cold water pipe 3, and the cold water connector to exchange heat with the burner 12, and then enter the hot water pipe 4 through the hot water connector, thereby achieving zero cold water output from the gas water heater 1.

[0040] As users' requirements for water quality increase, a water purifier 6 is usually connected in series on the cold water pipe 3 to purify the incoming water, thereby improving the quality of the incoming water.

[0041] However, see Figure 4 When the water purifier 6 is connected in series with the return water pipe, if the temperature of the return water in the return water pipe is too high, it will damage the reverse osmosis membrane in the water purifier 6, causing the water purifier 6 to fail to operate normally.

[0042] Implementation Plan 1

[0043] To meet users' needs for zero cold water while ensuring the normal operation of the water purifier 6, this application provides a gas-fired water heater 1. See also... Figures 3-6 The gas water heater 1 includes a shell 11, a burner 12, a heat exchange pipe 13, a water inlet connector 14, a water outlet connector 15, and a processor 16.

[0044] Both the burner 12 and the heat exchange pipe 13 are located inside the housing 11. The heat exchange pipe 13 is used for heat exchange with the burner 12, enabling the burner 12 to heat the water in the heat exchange pipe 13, thereby providing domestic hot water to users. It should be understood that the burner 12 includes a combustion section and a heat exchange section, and the heat exchange pipe 13 mainly exchanges heat with the heat exchange section.

[0045] Both the inlet connector 14 and the outlet connector 15 are located outside the housing 11. The inlet connector 14 is connected to the first end of the heat exchange pipeline 13, the cold water pipe 3, and the water purifier 6, so that the water in the cold water pipe 3 can enter the heat exchange pipeline 13 in sequence through the cold water pipe 3 and the inlet connector 14.

[0046] The outlet connector 15 is connected to both the second end of the heat exchange pipe 13 and the hot water pipe 4, so that the heated water in the heat exchange pipe 13 can enter the hot water pipe 4 through the outlet connector 15 to provide domestic hot water for users.

[0047] A one-way valve 5 connects the cold water pipe 3 and the hot water pipe 4. The one-way valve 5 only allows water to flow from the hot water pipe 4 into the cold water pipe 3, thus forming a return water circuit with the cold water pipe 3, hot water pipe 4, and one-way valve 5. It should be understood that the gas water heater 1 needs to be used in conjunction with a water terminal 2. Both the hot water pipe 4 and the cold water pipe 3 are connected to the water terminal 2. The one-way valve 5 should be installed in parallel with the water terminal 2. In this case, when the water terminal 2 is closed, water in the hot water pipe 4 can sequentially pass through the one-way valve 5, the cold water pipe 3, and the inlet connector 14 to enter the hot water pipe 4 for heating, and then enter the hot water pipe 4 through the outlet connector 15, thereby achieving zero cold water output from the gas water heater 1.

[0048] The processor 16 is located inside the housing 11, and the processor 16 is used to determine the installation position of the water purifier 6 and set the temperature threshold T according to the installation position. th .

[0049] If the water purifier 6 is installed in the cold water circuit, the processor 16 is also used to set the temperature threshold T. th The working temperature Tc of water purifier 6 and the preset heating temperature Ts of gas water heater 1 satisfy the following condition: T th <Tc, and T th <Ts.

[0050] Processor 16 is also used to receive zero cold water commands and obtain the water temperature of inlet connector 14 based on the zero cold water commands.

[0051] If the water temperature is determined to be less than or equal to the temperature threshold T th The processor 16 is also used to start the burner 12 to activate the zero-cold-water mode.

[0052] At this time, the water temperature is less than or equal to the temperature threshold T.th This indicates that the return water temperature in the return water pipe is lower than the preset heating temperature Ts of the gas water heater 1, thus indicating that the return water in the return water pipe needs to be heated to meet the user's zero-cold-water requirement. Simultaneously, the return water temperature in the return water pipe is lower than the operating temperature Tc of the water purifier 6, indicating that the return water in the return water pipe will not damage the reverse osmosis membrane in the water purifier 6. At this point, the burner 12 is activated to start the zero-cold-water mode, ensuring that the gas water heater 1 can meet the user's zero-cold-water requirement while also guaranteeing the normal operation of the water purifier 6.

[0053] It should be understood that a circulation pump 17 should be connected in series on the heat exchange pipeline 13. When the burner 12 is started, the circulation pump 17 also needs to be started to achieve zero cold water supply for the gas water heater 1.

[0054] It should be noted that the method of collecting the water temperature of the inlet connector 14 does not affect the realization of the purpose of this invention. Therefore, the method of collecting the water temperature of the inlet connector 14 is not limited here.

[0055] For example: see Figures 3-6 The gas water heater 1 also includes a first temperature sensor 18, which is located inside the water inlet connector 14 and is communicatively connected to the processor 16.

[0056] The operating temperature Tc of the water purifier 6 mentioned above needs to be determined according to the type of water purifier 6 used. For example, the operating temperature of the water purifier 6 mentioned above can be 5℃~38℃.

[0057] The preset heating temperature Ts of the gas water heater 1 is the temperature that the user inputs into the processor 16 via the control panel. Generally, the preset heating temperature Ts of the gas water heater 1 is 30℃ to 50℃.

[0058] In some embodiments, see Figures 3-6 When the processor 16 determines that the water purifier 6 is installed in the return water pipe, the processor 16 is also used to set the temperature threshold T. th The operating temperature Tc of the water purifier 6 and the preset heating temperature Ts of the gas water heater 1 satisfy the following relationship: Ts-a1 < Ts < Tc-a2; where a1 = 5℃~7℃ and a2 = 0℃~2℃. It should be understood that a1 and a2 are preset values ​​in the processor 16.

[0059] See also some possible implementations. Figures 3-6 The processor 16 described above is used to determine the installation location of the water purifier 6, including:

[0060] The processor 16 is used to obtain the first inlet water temperature of the water purifier 6, activate the zero cold water mode, and obtain the second inlet water temperature of the water purifier 6.

[0061] If the temperature difference ΔT between the second inlet water temperature and the first inlet water temperature is greater than the preset temperature threshold for heat exchange, the processor 16 determines that the water purifier 6 is installed in the return water pipe.

[0062] At this time, when the temperature difference ΔT between the second inlet water temperature and the first inlet water temperature is greater than the preset temperature threshold for heat exchange, it indicates that the water flowing through the water purifier 6 flows into the heat exchange pipeline 13 through the cold water pipe 3 for heating, and then flows into the water purifier 6 through the return water pipe. Thus, it can be determined that the water purifier 6 is installed in the return water pipe.

[0063] It should be noted that the methods for obtaining the first and second inlet water temperatures can be selected according to the actual situation, and are not limited here.

[0064] For example: see Figures 3-6 The gas water heater 1 also includes a second temperature sensor 19, which is located at the inlet of the water purifier 6 and is connected to the processor 16. The second temperature sensor 19 is used to intermittently collect the inlet water temperature of the water purifier 6 and send it to the processor 16.

[0065] The acquisition period of the second temperature sensor 19 can be determined according to the actual situation. For example, the acquisition period of the second temperature sensor 19 is 30S to 45S.

[0066] The aforementioned preset heat exchange temperature threshold can be determined based on the acquisition period of the second temperature sensor 19 and the power of the burner 12. For example, the preset heat exchange temperature threshold is 2℃ to 4℃.

[0067] In some embodiments, see Figures 3-6 The processor 16 is used to determine the installation location of the water purifier 6 and sets the temperature threshold T based on the installation location. th Subsequently, before receiving the zero-cold-water command, processor 16 is also used for:

[0068] Assuming the water purifier 6 is installed outside the return water pipe, set the temperature threshold T. th The preset heating temperature Ts of gas water heater 1 satisfies the following condition: T th <Ts.

[0069] At this time, when the processor 16 determines that the water purifier 6 is installed outside the return water pipe, the return water in the return water pipe will not flow through the water purifier 6, so that the return water in the return water pipe will not damage the anti-permeability membrane in the water purifier 6. Therefore, the temperature threshold T is set. th The preset heating temperature Ts of the gas water heater 1 satisfies the following condition: T th<Ts can not only meet the user's zero cold water requirement, but also ensure the user's normal operation.

[0070] For example, see Figures 3-6 After the processor 16 obtains the second inlet water temperature of the water purifier 6 again, the processor 16 is also used to:

[0071] If the temperature difference ΔT between the second inlet water temperature and the first inlet water temperature is less than or equal to the preset temperature threshold for heat exchange, it is determined that the water purifier 6 is installed outside the return water pipe.

[0072] At this time, the temperature difference ΔT between the second inlet water temperature and the first inlet water temperature is less than or equal to the preset temperature threshold for heat exchange, indicating that the water flowing through the water purifier 6 does not enter the heat exchange pipe 13 for heating and then enter the water purifier 6 through the return water pipe, thus confirming that the water purifier 6 is installed outside the return water pipe.

[0073] For example, see Figures 3-6 If it is determined that the water purifier 6 is installed outside the return water pipe, the processor 16 is also used to set the temperature threshold T. th The preset heating temperature Ts of the gas water heater 1 satisfies the following condition: Ts - a1 < T th <Ts-a2; where a1 = 5℃~7℃, a2 = 0℃~2℃. It should be understood that a1 and a2 are both preset values ​​within the processor 16.

[0074] In some embodiments, see Figures 3-6 After the processor 16 is used to start the burner 12 to activate the zero-cold-water mode, the processor 16 is also used to:

[0075] If it is determined that the water temperature is greater than the temperature threshold T th Turn off the burner 12 to disable the zero-cold-water mode.

[0076] At this time, with the water purifier 6 installed in the return water pipe, the water temperature exceeds the temperature threshold T. th This indicates that the water temperature can meet the user's zero cold water requirement, and that a higher water temperature poses a risk of damaging the reverse osmosis membrane in the water purifier 6. In this case, turning off the zero cold water mode can ensure that the gas water heater 1 can meet the user's zero cold water requirement while ensuring the normal operation of the water purifier 6.

[0077] When the water purifier 6 is installed outside the return water pipe, the water temperature exceeds the temperature threshold T. th This indicates that the water temperature can meet the user's zero-cold-water requirement. At this time, turning off the zero-cold-water mode can prevent the hot water in hot water pipe 4 from being too hot and scalding the user, and can also save gas.

[0078] Implementation Plan 2

[0079] This implementation plan provides a control method for the aforementioned gas water heater 1. See [link / reference needed]. Figure 7 The control method for the aforementioned gas water heater 1 includes:

[0080] S100: Determine the installation location of water purifier 6 and set the temperature threshold T according to the installation location. th .

[0081] If it is confirmed that the water purifier 6 is installed in the return water pipe, proceed with S200A:

[0082] S200A: Set temperature threshold T th The working temperature Tc of water purifier 6 and the preset heating temperature Ts of gas water heater 1 satisfy the following condition: T th <Tc, and T th <Ts;

[0083] S300: Receives a zero-cold-water command and obtains the water temperature of the inlet connector 14 according to the zero-cold-water command;

[0084] If the water temperature is determined to be less than or equal to the temperature threshold T th Execute S400A.

[0085] S400A: Start burner 12 to activate zero-cold-water mode.

[0086] Compared with the prior art, the beneficial effects of the control method for the gas water heater 1 provided in this embodiment are the same as those of the gas water heater 1 described above, and will not be repeated here.

[0087] In some embodiments, when it is determined that the water purifier 6 is installed in the return water line, a temperature threshold T is set. th The working temperature Tc of the water purifier 6 and the preset heating temperature Ts of the gas water heater 1 satisfy the following relationship: Ts-a1 < Ts < Tc-a2; where a1 = 5℃~7℃ and a2 = 0℃~2℃.

[0088] In some embodiments, see Figure 8 The above-mentioned S100 determines the installation location of the water purifier 6, including:

[0089] S110: Obtain the first inlet water temperature of water purifier 6, activate the zero cold water mode, and obtain the second inlet water temperature of water purifier 6 again.

[0090] If the temperature difference ΔT between the second inlet water temperature and the first inlet water temperature is greater than the preset temperature threshold for heat exchange, S120A is executed.

[0091] S120A: Confirm that water purifier 6 is installed in the return water pipe.

[0092] In some embodiments, see Figure 7 In step S100, the installation location of the water purifier 6 is determined, and the temperature threshold T is set according to the installation location. th Subsequently, before S100 receives the zero cold water command, the control method for gas water heater 1 also includes:

[0093] If it is determined that the water purifier 6 is installed outside the return water line, proceed with S200B.

[0094] S200B: Set temperature threshold T th The preset heating temperature Ts of gas water heater 1 satisfies the following condition: T th <Ts.

[0095] In some embodiments, see Figure 8 Following S110, the process of determining the installation location of the water purifier 6 in S100 also includes:

[0096] If the temperature difference ΔT between the second inlet water temperature and the first inlet water temperature is less than or equal to the preset temperature threshold for heat exchange, S120B is executed.

[0097] S120B: Ensure that water purifier 6 is installed outside the return water pipe.

[0098] In some embodiments, if it is determined that the water purifier 6 is installed outside the return water pipe, a temperature threshold T is set. th The working temperature Tc of water purifier 6 and the preset heating temperature Ts of gas water heater 1 satisfy the following condition: Ts - a1 < T th <Ts-a2; where a1 = 5℃~7℃, a2 = 0℃~2℃.

[0099] As one possible implementation, the preset temperature threshold for heat exchange is located within 2℃ to 4℃.

[0100] In some embodiments, see Figure 7 After S300, when it is determined that the water circuit temperature is greater than the temperature threshold T th In this case, execute S400B.

[0101] S400B: Turn off burner 12 to disable zero-cold-water mode.

[0102] Implementation Plan 3

[0103] This embodiment provides a computer-readable storage medium. The computer-readable storage medium includes computer instructions that, when executed on the processor 16 of the gas water heater 1, cause the processor 16 to perform the aforementioned control method.

[0104] Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this embodiment are the same as the beneficial effects of the control method of the gas water heater 1 described above, and will not be repeated here.

[0105] Implementation Plan 4

[0106] This embodiment provides a computer program product. The computer program product includes computer instructions that, when executed on the processor 16 of the gas water heater 1, cause the processor 16 to perform the control method described above.

[0107] Compared with the prior art, the beneficial effects of the computer program product provided in this embodiment are the same as the beneficial effects of the control method of the gas water heater 1 described above, and will not be repeated here.

[0108] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0109] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A gas water heater, characterized in that, include: case; The burner is disposed within the housing; Heat exchange piping is installed inside the housing and is used for heat exchange with the burner; The water inlet connector is located outside the housing and is connected to the first end of the heat exchange pipeline, the cold water pipe, and the water purifier. A water outlet connector is located outside the housing and is connected to the second end of the heat exchange pipeline and the hot water pipe; a one-way valve is connected between the cold water pipe and the hot water pipe; the one-way valve only allows water to flow from the hot water pipe into the cold water pipe, so that the cold water pipe, the hot water pipe and the one-way valve form a return water pipeline; A processor, disposed within the housing, is used to determine the installation position of the water purifier and set a temperature threshold T based on the installation position. th ; If the water purifier is confirmed to be installed in the return water pipe, the processor is further configured to set the temperature threshold T. th The operating temperature Tc of the water purifier and the preset heating temperature Ts of the gas water heater satisfy the following relationship: T th <Tc, and T th <Ts; The processor is also used to receive a zero-cold-water command and obtain the water temperature of the inlet connector according to the zero-cold-water command. If the water temperature is determined to be less than or equal to the temperature threshold T th The processor is also used to start the burner to activate the zero-cold-water mode.

2. The gas water heater according to claim 1, characterized in that, The processor is used to determine the installation location of the water purifier, including: The processor is used to obtain the first inlet water temperature of the water purifier, activate the zero cold water mode, and obtain the second inlet water temperature of the water purifier again. If the temperature difference ΔT between the second inlet water temperature and the first inlet water temperature is greater than the preset temperature threshold for heat exchange, the processor is further configured to determine that the water purifier is installed in the return water pipeline.

3. The gas water heater according to claim 2, characterized in that, The processor determines the installation location of the water purifier and sets a temperature threshold T based on the installation location. th Subsequently, before receiving the zero-cold-water command, if it is determined that the water purifier is installed outside the return water pipe, the processor is further configured to: Set the temperature threshold T th The preset heating temperature Ts of the gas water heater satisfies the following condition: T th <Ts.

4. The gas water heater according to claim 3, characterized in that, After the processor acquires the second inlet water temperature of the water purifier again, the processor's determination of the installation location of the water purifier further includes: If the temperature difference ΔT between the second inlet water temperature and the first inlet water temperature is less than or equal to a preset heat exchange temperature threshold, the processor is further configured to determine that the water purifier is installed outside the return water pipe.

5. The gas water heater according to any one of claims 1 to 4, characterized in that, After the processor is further configured to receive a zero-cold-water command and obtain the water temperature of the inlet connector based on the zero-cold-water command, the processor is further configured to: When the water temperature is determined to be greater than the temperature threshold T th In this case, the burner is turned off to shut down the zero-cold-water mode.

6. A control method applied to a gas water heater as described in any one of claims 1 to 5, characterized in that, include: Determine the installation location of the water purifier, and set a temperature threshold T based on the installation location. th ; Assuming the water purifier is installed in the return water pipe, the temperature threshold T is set. th The operating temperature Tc of the water purifier and the preset heating temperature Ts of the gas water heater satisfy the following relationship: T th <Tc, and T th <Ts; Receive a zero-cold-water command and obtain the water temperature of the inlet connector based on the zero-cold-water command; If the water temperature is determined to be less than or equal to the temperature threshold T th Start the burner to activate the zero-cold-water mode.

7. The control method for a gas water heater according to claim 6, characterized in that, Determining the installation location of the water purifier includes: Obtain the first inlet water temperature of the water purifier, activate the zero cold water mode, and then obtain the second inlet water temperature of the water purifier again. If the temperature difference ΔT between the second inlet water temperature and the first inlet water temperature is greater than the preset temperature threshold for heat exchange, it is determined that the water purifier is installed in the return water pipeline.

8. The control method for a gas water heater according to claim 7, characterized in that, After determining the installation location of the water purifier, a temperature threshold T is set based on the installation location. th Subsequently, before receiving the zero-cold-water command, and assuming the water purifier is installed outside the return water pipe, the control method for the gas water heater further includes... Set the temperature threshold T th The preset heating temperature Ts of the gas water heater satisfies the following condition: T th <Ts.

9. A computer-readable storage medium, characterized in that, The system includes computer instructions that, when executed on the processor of the gas water heater, cause the processor to perform the control method as described in any one of claims 6 to 8.

10. A computer program product, characterized in that, The system includes computer instructions that, when executed on the processor of the gas water heater, cause the processor to perform the control method as described in any one of claims 6 to 8.

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