Heat pump system, control method thereof and electronic equipment

Abstract

The invention discloses a heat pump system and a control method thereof and electronic equipment, the heat pump system comprises a compressor, a hot water module, an outdoor side heat exchanger, a throttling element and an indoor unit which are arranged on the same refrigerant circulation loop, a first switch valve is arranged at an outlet of the compressor, and a first expansion valve is arranged at a refrigerant outlet of the hot water module; the control method comprises the steps that a mode switching instruction for the heat pump system is received, wherein the mode switching instruction comprises a first operation mode before mode switching of the heat pump system and a second operation mode after mode switching of the heat pump system; judging whether the first operation mode or the second operation mode is a pure domestic hot water mode or not; if yes, the first switch valve is controlled to act, and the first expansion valve is controlled to adjust the opening degree according to the second operation mode, so that the heat pump system is switched from the first operation mode to the second operation mode to operate. The problems that when the heat pump system is started, the control logic is complex, and the operation stability is low can be solved at least.

Description

Technical Field

[0001] This application relates to the field of air conditioning control technology, and more specifically, to a heat pump system and its control method, electronic equipment, and... Background Technology

[0002] In related technologies, tri-generation multi-split heat pump systems integrate air conditioning, underfloor heating, and hot water production functions. In actual use, the more operating modes a heat pump system can operate in, the more complex its structure becomes. This leads to more complex control logic during mode switching, resulting in lower operational stability and impacting user experience and system reliability. Summary of the Invention

[0003] The main objective of this application is to provide a heat pump system and its control method and electronic equipment to solve the problems of complex control logic and low operational stability of heat pump systems during startup in the prior art.

[0004] According to one aspect of this application, a heat pump system control method is provided. The heat pump system includes a compressor, a hot water module, an outdoor heat exchanger, a throttling element, and an indoor unit, all disposed in the same refrigerant circulation loop. The compressor outlet is provided with a first on / off valve, and the hot water module refrigerant outlet is provided with a first expansion valve. The control method includes: Receive a mode switching command for the heat pump system, the mode switching command including a first operating mode before the mode switching of the heat pump system and a second operating mode after the mode switching of the heat pump system; Determine whether the first operating mode or the second operating mode is a pure domestic hot water mode; If so, the first switching valve is controlled to operate, and the first expansion valve is controlled to adjust its opening according to the second operating mode, so that the heat pump system switches from the first operating mode to the second operating mode.

[0005] In one embodiment, the control method includes: When the first operating mode or the second operating mode is a pure domestic hot water mode, the heat pump system is shut down. The heat pump system is restarted based on the second operating mode, the first switching valve is controlled to operate, and the opening of the first expansion valve is adjusted, so that the heat pump system switches from the first operating mode to the second operating mode.

[0006] In one embodiment, the control method includes: When the first operating mode is pure domestic hot water mode and the second operating mode is not pure domestic hot water mode, control the first switch valve to open; and / or When the first operating mode is a non-pure domestic hot water mode and the second operating mode is a pure domestic hot water mode, the first switch valve is controlled to close.

[0007] In one embodiment, the control method includes: When the first operating mode is pure domestic hot water mode and the second operating mode is heating + domestic hot water mode, the heat pump system is shut down. The system controls the first switch valve to switch from closed to open, detects whether there is a water tank malfunction in the hot water module, and if so, controls the heat pump system to start operating in pure heating mode. Otherwise, based on the heating + domestic hot water mode, the system controls the first expansion valve to adjust to the initial opening, and controls the first expansion valve to start timing and adjust the opening, so that the heat pump system switches from the pure domestic hot water mode to the heating + domestic hot water mode.

[0008] In one embodiment, the control method includes: When the first operating mode is heating + domestic hot water mode and the second operating mode is pure domestic hot water mode, the heat pump system is shut down. The system detects whether the hot water module has a water tank malfunction. If so, it stops starting the heat pump system. Otherwise, based on the pure domestic hot water mode, it controls the first switch valve to switch from open to closed and adjusts the opening of the first expansion valve so that the heat pump system switches from the heating + domestic hot water mode to the pure domestic hot water mode.

[0009] In one embodiment, the control method further includes: When the first operating mode is pure cooling mode and the second operating mode is cooling + domestic hot water mode, the first switching valve is kept open, and the first expansion valve is adjusted to its initial opening based on the cooling + domestic hot water mode. The first expansion valve is also controlled to start timing and adjust its opening, so that the heat pump system switches from the pure cooling mode to the cooling + domestic hot water mode; and / or, When the first operating mode is cooling + domestic hot water mode and the second operating mode is pure cooling mode, the first switch valve is kept open, and the first expansion valve is adjusted to the first target opening degree based on the pure cooling mode, so that the heat pump system switches from the cooling + domestic hot water mode to the pure cooling mode.

[0010] In one embodiment, the control method further includes: When the first operating mode is pure heating mode and the second operating mode is heating + domestic hot water mode, the first on / off valve is kept open, and the first expansion valve is adjusted to its initial opening based on the heating + domestic hot water mode. The first expansion valve is also controlled to start timing and adjust its opening, so that the heat pump system switches from the pure heating mode to the heating + domestic hot water mode; and / or, When the first operating mode is heating + domestic hot water mode and the second operating mode is pure heating mode, the first switch valve is kept open, the first expansion valve is adjusted to the second target opening degree based on the pure heating mode, and the temperature is adjusted according to the water temperature of the hot water module so that the heat pump system switches from the heating + domestic hot water mode to the pure heating mode.

[0011] In one embodiment, the control method further includes: When the heat pump system is in cooling + hot water mode, it determines whether all the indoor units that are turned on have entered the temperature reach state. The temperature reach state means that the indoor temperature detected by the indoor unit has reached the cooling target temperature and has been maintained for a preset time. If so, it is determined that the hot water capacity requirement of the heat pump system is met, and the heat pump system is controlled to switch from the cooling + hot water mode to the pure cooling mode.

[0012] According to another aspect of this application, a heat pump system is also provided, including a compressor, a hot water module, an outdoor heat exchanger, a throttling element, and an indoor unit disposed in the same refrigerant circulation loop. The compressor outlet is provided with a first switching valve, and the hot water module refrigerant outlet is provided with a first expansion valve. The heat pump system further includes a controller for executing the above-described heat pump system control method.

[0013] According to another aspect of this application, an electronic device is also provided, including a memory and a processor; wherein, The memory is used to store computer programs; The processor is used to execute the computer program to implement the heat pump system control method described above.

[0014] In this application, when a pure domestic hot water mode exists before or after a mode switching command, the first switching valve is controlled to operate, and the opening of the first expansion valve is adjusted according to the operating mode after the switch, so that the heat pump system can switch between pure domestic hot water mode and other operating modes. The mode switching is performed by controlling the first switching valve and the first expansion valve. The structure is simple, and the corresponding mode switching control logic is also relatively simple. It can not only realize the switching of the heat pump system between different operating modes, but also further improve the operating stability and reliability of the heat pump system. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, are illustrative and descriptive, serving to explain this application and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a heat pump system disclosed in an embodiment of this application; Figure 2 This is a schematic diagram of the refrigerant flow direction of the heat pump system disclosed in this application when it is in pure domestic hot water mode; Figure 3 This is a schematic diagram of the refrigerant flow direction of the heat pump system disclosed in this application when it is in heating + domestic hot water mode; Figure 4 This is a schematic diagram of the refrigerant flow direction of the heat pump system disclosed in this application when it is in cooling + domestic hot water mode; Figure 5 This is a schematic diagram of the refrigerant flow direction of the heat pump system disclosed in this application when it is in pure heating mode; Figure 6 This is a schematic diagram of the refrigerant flow direction of the heat pump system disclosed in this application when it is in pure cooling mode; Figure 7 This is another structural schematic diagram of a heat pump system disclosed in an embodiment of this application; Figure 8 This is a schematic flowchart of a heat pump system control method disclosed in an embodiment of this application; Figure 9 This is a schematic diagram of the structure of an electronic device disclosed in an embodiment of this application.

[0016] The above figures include the following reference numerals: 10. Compressor; 11. Compressor inlet; 12. Compressor outlet; 13. Gas inlet; 20. Hot water module; 21. Refrigerant inlet; 22. Refrigerant outlet; 23. Water tank; 30. Outdoor heat exchanger; 31. First refrigerant interface; 32. Second refrigerant interface; 41. First throttle valve; 42. Second throttle valve; 43. Third throttle valve; 50. Indoor unit; 51. Indoor heat exchanger; 52. Third refrigerant interface; 53. Fourth refrigerant interface; 60. First switching valve; 70. First expansion valve; 80. Reversing valve; 81. First valve port; 82. Second valve port; 83. Third valve port; 84. Fourth valve port; 91. First shut-off valve; 92. Second shut-off valve; 93. 94. Third shut-off valve; 105. Fourth shut-off valve; 106. Economizer; 107. First port; 108. Second port; 109. Third port; 100. Fourth port; 110. First filter; 120. Gas-liquid separator; 130. Heat recovery capillary tube; 140. Second filter; 150. Third filter; 160. First check valve; 170. Second check valve; 180. Oil separator; 190. Fourth filter; 200. Solenoid valve; 210. Oil return capillary tube; 220. Underfloor heating module; 221. Underfloor heating heat exchanger; 222. Second expansion valve; 223. Third check valve; 300. Electronic equipment; 301. Memory; 303. Processor. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0020] As described in the background section, in related technologies, tri-generation multi-split heat pump systems can achieve multiple operating modes in actual use. However, the more operating modes there are, the more complex the structure of the heat pump system becomes, leading to a more complicated mode switching process, lower operational stability and reliability, and a poor user experience. Therefore, this application provides a heat pump system and its control method and electronic equipment. The compressor outlet of the heat pump system is equipped with a first switching valve, and the refrigerant outlet of the hot water module is equipped with a first expansion valve. By adjusting the opening and closing state of the first switching valve and the opening degree of the first expansion valve, the heat pump system can switch between different operating modes. This heat pump system has a simpler structure and control logic, and higher operational stability and reliability. The heat pump system, its control method, and electronic equipment of this application will be described below with reference to the accompanying drawings.

[0021] See Figure 1 As shown in the figure, this application provides a heat pump system, which includes a compressor 10, a hot water module 20, an outdoor heat exchanger 30, a throttling element, and an indoor unit 50, all disposed on the same refrigerant circulation loop.

[0022] Understandably, in this embodiment, the compressor 10 is used to compress the refrigerant into a high-temperature, high-pressure refrigerant. The compressor 10 includes a compressor inlet 11, a compressor outlet 12, and a gas injection port 13. A first switching valve 60 is provided at the compressor outlet 12, and a first expansion valve 70 is provided on the pipeline connected to the refrigerant outlet 22 of the hot water module 20. In this embodiment, by adjusting the opening and closing state of the first switching valve 60 and the opening degree of the first expansion valve 70, the heat pump system can be switched between different operating modes.

[0023] Specifically, in this embodiment, the hot water module 20 includes a refrigerant inlet 21, a refrigerant outlet 22, a water tank 23, and a heat recovery heat exchanger (not shown in the figure); the outdoor heat exchanger 30 includes a first refrigerant interface 31 and a second refrigerant interface 32; and the indoor unit 50 includes an indoor heat exchanger 51, a third refrigerant interface 52, and a fourth refrigerant interface 53.

[0024] In one embodiment, the water tank 23 is a microchannel water tank, and the heat recovery heat exchanger is a microchannel heat exchanger. The microchannel heat exchanger is installed on the inner wall of the water tank 23. When the refrigerant passes through the hot water module 20, it can exchange heat at the microchannel heat exchanger to heat the water in the water tank 23, thereby realizing the functions of heat recovery of the refrigerant and hot water production.

[0025] In this embodiment, one end of the first switching valve 60 is connected to the pipeline between the outlet of the compressor 10 and the refrigerant inlet 21, and the other end is connected to the first refrigerant interface 31 and the fourth refrigerant interface 53 respectively through the reversing valve 80. The first switching valve 60 in this embodiment includes a two-way valve.

[0026] Understandably, in this embodiment, the switching between pure heating mode and other operating modes of the heat pump system can be achieved by controlling the opening and closing state of the first switching valve 60. When the first switching valve 60 is in the closed state, only one path of the hot water module 20 forms refrigerant circulation in the heat pump system, and the heat pump system operates in pure domestic hot water mode. When the first switching valve 60 is in the open state, the heat pump system operates in other operating modes besides pure domestic hot water mode.

[0027] In this embodiment, one end of the first expansion valve 70 is connected to the refrigerant outlet 22, and the other end is connected to the pipeline between the second refrigerant interface 32 and the third refrigerant interface 52.

[0028] It is understood that the first expansion valve 70 in this embodiment functions as a heat recovery expansion valve. When the heat pump system is operating in a hot water mode, the opening of the heat recovery expansion valve can be adjusted in combination with the on / off state of different pipelines in the heat pump system to achieve the switching between different operating modes of the heat pump system.

[0029] In one embodiment, the reversing valve 80 includes a four-way valve, which includes a first valve port 81, a second valve port 82, a third valve port 83 and a fourth valve port 84. The first valve port 81 is connected to the first switching valve 60, the second valve port 82 is connected to the fourth refrigerant interface 53, the third valve port 83 is connected to the first refrigerant interface 31, and the fourth valve port 84 is connected to the compressor inlet 11.

[0030] In this embodiment, the flow direction of refrigerant between the compressor 10, the hot water module 20 and the outdoor heat exchanger 30 can be changed by the conduction relationship between the first valve port 81, the second valve port 82, the third valve port 83 and the fourth valve port 84 of the four-way valve when the heat pump system needs to switch operating modes.

[0031] In one embodiment, the heat pump system further includes a shut-off valve assembly, which includes a first shut-off valve 91, a second shut-off valve 92, a third shut-off valve 93, and a fourth shut-off valve 94. The first shut-off valve 91 is disposed on the pipeline between the outlet of the compressor 10 and the refrigerant inlet 21, the second shut-off valve 92 is disposed on the pipeline between the refrigerant outlet 22 and the second refrigerant interface 32, the third shut-off valve 93 is disposed on the pipeline between the second refrigerant interface 32 and the third refrigerant interface 52, and the fourth shut-off valve 94 is disposed on the pipeline between the second valve port 82 and the fourth refrigerant interface 53.

[0032] In this embodiment, the conduction state of the hot water module 20 can be controlled by controlling the shut-off state of the first shut-off valve 91 and the second shut-off valve 92. The conduction state between the compressor 10 and the outdoor heat exchanger 30 and the indoor unit 50 can be controlled by controlling the states of the third shut-off valve 93 and the fourth shut-off valve 94.

[0033] In one embodiment, the throttling element includes a first throttling device 41 and a second throttling device 42. The first throttling device 41 is disposed on the pipeline connecting the second refrigerant interface 32 and the third refrigerant interface 52, and the second throttling device 42 is disposed in the indoor unit 50 and connected to the pipeline between the third refrigerant interface 52 and the indoor heat exchanger 51.

[0034] In one embodiment, the first throttle 41 includes an expansion valve, and the second throttle 42 includes an expansion valve.

[0035] In one embodiment, the heat pump system further includes an economizer 100 and a third throttle valve 43. The economizer 100 includes a first port 101, a second port 102, a third port 103, and a fourth port 104. The first port 101 is connected to the third port 103, the second port 102 is connected to the fourth port 104, the first port 101 is also connected to the pipeline between the first throttle valve 41 and the first expansion valve 70, the second port 102 is connected to the third throttle valve 43, the third port 103 is connected to the third shut-off valve 93 through the first filter 110, the third throttle valve 43 is connected to the pipeline between the first filter 110 and the third port 103, and the fourth port 104 is connected to the gas supply port 13 of the compressor 10.

[0036] In one embodiment, the third throttle 43 includes an expansion valve.

[0037] In one embodiment, the heat pump system further includes a gas-liquid separator 120 connected to a pipeline between the fourth valve port 84 and the compressor inlet 11.

[0038] In one embodiment, at least one heat recovery capillary 130 and a second filter 140 are provided on the pipeline between the first expansion valve 70 and the second shut-off valve 92.

[0039] In one embodiment, the heat pump system further includes a third filter 150, a first one-way valve 160, and a second one-way valve 170. The third filter 150 is disposed on the pipeline between the second refrigerant interface 32 and the first throttle 41. The first one-way valve 160 is disposed in parallel with the first throttle 41 and is open in the direction from the second refrigerant interface 32 to the first port 101. The second one-way valve 170 is disposed on the pipeline between the first expansion valve 70 and the first port 101 and is open in the direction from the first expansion valve 70 to the first port 101.

[0040] In one embodiment, the heat pump system further includes an oil separator 180, which is disposed on a pipeline connected to the compressor outlet 12. The pipeline where the first switching valve 60 and the first shut-off valve 91 merge is connected to the oil separator 180. The oil separator 180 is also connected to the air supply port 13 of the compressor 10 in sequence through a fourth filter 190, a solenoid valve 200, and an oil return capillary tube 210.

[0041] In one embodiment, the indoor unit 50 includes at least two, and the different indoor units 50 are connected in parallel with each other, that is, the third refrigerant interface 52 of each indoor unit 50 is connected to the main liquid pipe, and the fourth refrigerant interface 53 of each indoor unit 50 is connected to the main gas pipe.

[0042] In one embodiment, the outdoor heat exchanger 30 includes a finned heat exchanger.

[0043] In one embodiment, the indoor heat exchanger 51 includes a plate heat exchanger.

[0044] Understandably, the heat pump system in this embodiment includes a pure domestic hot water mode, as well as at least one of a cooling + domestic hot water mode, a heating + domestic hot water mode, a pure cooling mode, and a pure heating mode. As can be seen from the above embodiments, the heat pump system in this embodiment controls the states of the first switching valve 60, the first expansion valve 70, and the reversing valve 80 to switch between at least two modes among the pure domestic hot water mode, cooling + domestic hot water mode, heating + domestic hot water mode, pure cooling mode, and pure heating mode.

[0045] Understandably, during special circumstances such as transitional seasons, the heat pump system in this embodiment can operate as a water heater heat pump in pure domestic hot water mode, only producing domestic hot water and not heating or cooling, and does not function as an air conditioner.

[0046] See Figure 2 As shown, when the heat pump system in this embodiment is in pure domestic hot water mode, the first switch valve 60 is switched to the closed position. All the high-temperature and high-pressure refrigerant coming out of the compressor outlet 12 enters the hot water module 20 through the first shut-off valve 91. This is equivalent to all the heat of the high-temperature and high-pressure refrigerant being exchanged at the heat recovery heat exchanger of the hot water module 20 to produce hot water. Then, it passes through the second shut-off valve 92, the second filter 140, the heat recovery capillary tube 130, the first expansion valve 70, the second one-way valve 170, the first throttle 41, and the third filter 150 in sequence to enter the outdoor heat exchanger 30 (which acts as an evaporator) to evaporate and absorb outdoor air heat. Finally, it passes through the four-way valve and the gas-liquid separator 120 in sequence and returns to the compressor 10 from the compressor inlet 11 to start a new cycle.

[0047] See Figure 3 As shown, in this embodiment, when the heat pump system is in heating + domestic hot water mode, after the high-temperature and high-pressure refrigerant comes out of the compressor outlet 12, part of the heat enters the heat recovery heat exchanger in the hot water module 20 through the first shut-off valve 91 for heat exchange, and the other part of the heat enters the indoor heat exchanger 51 (which acts as a condenser) through the first on / off valve 60, the four-way valve, the fourth shut-off valve 94, and the main gas pipe to release heat and achieve the indoor heating effect. Then, the refrigerant passes through the second throttle valve 42, the main liquid pipe, the third shut-off valve 93, and the first filter 110 in sequence. The liquid refrigerant from the heat recovery heat exchanger passes through the second shut-off valve 92, the second filter 140, the heat recovery capillary tube 130, the first expansion valve 70, and the second one-way valve 170 in sequence. After merging with the refrigerant from the economizer 100, it passes through the first throttle valve 41 and the third filter 150 in sequence and enters the outdoor heat exchanger 30 (which acts as an evaporator) to evaporate and absorb heat from the outdoor air. Finally, it passes through the four-way valve and the gas-liquid separator 120 in sequence and returns to the compressor 10 from the compressor inlet 11 to start a new cycle.

[0048] See Figure 4As shown, when the heat pump system in this embodiment is in cooling + domestic hot water mode, after the high-temperature and high-pressure refrigerant comes out of the compressor outlet 12, part of the heat is released by passing through the first switch valve 60 and the four-way valve into the outdoor heat exchanger 30. The other part of the heat is released by passing through the first shut-off valve 91 into the hot water module 20. This means that part of the heat of the high-temperature and high-pressure refrigerant is exchanged at the heat recovery heat exchanger of the hot water module 20. Then, it passes through the second shut-off valve 92, the second filter 140, the heat recovery capillary tube 130, the first expansion valve 70, and the second one-way valve 170 in sequence, and then merges with the refrigerant that releases heat in the outdoor heat exchanger 30 and flows through the third filter 150 and the first one-way valve 160. After the refrigerant is combined, it passes through the economizer 100, the first filter 110, the third shut-off valve 93, the main liquid pipe, and the second throttle valve 42 in sequence before reaching the indoor heat exchanger 51 (which acts as an evaporator) to evaporate and absorb indoor heat to achieve a cooling effect. Finally, the refrigerant passes through the fourth shut-off valve 94, the four-way valve, and the gas-liquid separator 120 in sequence before returning to the compressor 10 from the compressor inlet 11 to start a new cycle.

[0049] See Figure 5 As shown, in this embodiment, when the heat pump system is in pure heating mode, the high-temperature and high-pressure refrigerant exits from the compressor outlet 12 and passes through the first switching valve 60, the four-way valve, the fourth shut-off valve 94, and the main gas pipe in sequence before entering the indoor heat exchanger 51 (which acts as a condenser) to release heat and achieve indoor heating. Then, the refrigerant passes through the second throttle valve 42, the main liquid pipe, the third shut-off valve 93, the first filter 110, the economizer 100, the first throttle valve 41, and the third filter 150 in sequence before reaching the outdoor heat exchanger 30 (which acts as an evaporator) to evaporate and absorb heat from the outdoor air. Finally, it returns to the compressor 10 from the compressor inlet 11 to start a new cycle.

[0050] like Figure 6 As shown, in this embodiment, when the heat pump system is in pure cooling mode, the high-temperature and high-pressure refrigerant exits from the compressor outlet 12 and passes through the first switching valve 60 and the four-way valve in sequence before directly entering the outdoor heat exchanger 30 (which acts as a condenser) to release heat. Then, it passes through the third filter 150, the first one-way valve 160, the economizer 100, the first filter 110, the third shut-off valve 93, the main liquid pipe, and the second throttle valve 42 in sequence before reaching the indoor heat exchanger 51 (which acts as an evaporator) to evaporate and absorb indoor heat to achieve a cooling effect. Finally, the refrigerant passes through the main gas pipe, the fourth shut-off valve 94, the four-way valve, and the gas-liquid separator 120 in sequence before returning to the compressor 10 from the compressor inlet 11 to start a new cycle.

[0051] Optionally, see Figure 7As shown, another structure of the heat pump system in this embodiment also includes a floor heating module 220. The floor heating module 220 includes a floor heating heat exchanger 221, a second expansion valve 222 and a third one-way valve 223. The inlet of the floor heating module 220 is connected to the fourth refrigerant interface 53, and the outlet of the floor heating module 220 is connected to the third refrigerant interface 52 in sequence through the second expansion valve 222 and the third one-way valve 223. The floor heating heat exchanger 221 is disposed between the inlet of the floor heating module 220 and the second expansion valve 222.

[0052] In one embodiment, the underfloor heating heat exchanger 221 includes a plate heat exchanger.

[0053] Optionally, in this embodiment, the heat pump system includes a floor heating module 220. When the heat pump system is in the cooling + domestic hot water mode, the refrigerant in the main liquid pipe is introduced into the floor heating heat exchanger 221 of the floor heating module 220 to exchange heat with the terminal water circuit to achieve the effect of floor cooling (the flow direction of the refrigerant in the floor heating module is not shown in the figure).

[0054] Optionally, in this embodiment, the heat pump system includes a floor heating module 220. When the heat pump system is in heating + domestic hot water mode, the refrigerant in the main liquid pipe is introduced into the floor heating heat exchanger 221 of the floor heating module 220 to exchange heat with the terminal water circuit to achieve the effect of floor heating. Either the indoor unit 50 or the floor heating module 220 can be operated, or they can operate simultaneously.

[0055] See Figure 8 As shown in the figure, this application embodiment also provides a heat pump system control method. This control method is used to control the heat pump system in the above embodiment to enable the heat pump system to switch between different operating modes. The heat pump system further includes a controller (not shown in the figure), which is used to execute the heat pump system control method in this embodiment. The heat pump system control method includes: Step S201: Receive a mode switching command for the heat pump system. The mode switching command includes a first operating mode before the mode switching of the heat pump system and a second operating mode after the mode switching of the heat pump system.

[0056] Step S202: Determine whether the first operating mode or the second operating mode is a pure domestic hot water mode; Step S203: If yes, then control the first switching valve 60 to operate and control the first expansion valve 70 to adjust its opening according to the second operating mode, so that the heat pump system switches from the first operating mode to the second operating mode.

[0057] In this embodiment, by determining whether the first or second operating mode in the mode switching command is a pure domestic hot water mode, when the first or second operating mode is a pure domestic hot water mode, the first switching valve 60 is controlled to operate and the opening of the first expansion valve 70 is adjusted, thereby enabling the heat pump system to switch from the first operating mode to the second operating mode. The heat pump system structure and specific control logic of this embodiment are relatively simple. Under the condition of switching between different operating modes, the stability of the heat pump system is significantly improved, and in the cooling mode, part of the heat of the refrigerant can be recovered, improving the energy efficiency of the heat pump system and the user experience.

[0058] Understandably, in this embodiment, the controller receives the mode switching command from the heat pump system. After receiving the mode switching command, the controller parses the command to obtain the first operating mode and the second operating mode. The first operating mode is any one of the following: pure domestic hot water mode, cooling + domestic hot water mode, heating + domestic hot water mode, pure cooling mode, and pure heating mode. The second operating mode is any one of the following other than the first operating mode: pure domestic hot water mode, cooling + domestic hot water mode, heating + domestic hot water mode, pure cooling mode, and pure heating mode. That is, the first operating mode and the second operating mode are different to ensure that the heat pump system can switch modes normally.

[0059] Specifically, when the first operating mode or the second operating mode is a pure domestic hot water mode, the heat pump system control method of this embodiment includes: When the first or second operating mode is the pure domestic hot water mode, the heat pump system is shut down. The heat pump system is restarted based on the second operating mode. The first switching valve 60 is controlled to operate, and the opening of the first expansion valve 70 is adjusted, so that the heat pump system switches from the first operating mode to the second operating mode.

[0060] Understandably, see Figure 2As shown, in this embodiment, when the heat pump system is in pure domestic hot water mode, the indoor unit 50 stops operating, and the first switching valve 60 is closed, allowing the high-temperature, high-pressure refrigerant in the compressor 10 to directly enter the hot water module 20 from the compressor outlet 12, and then return to the compressor 10 from the compressor inlet 11 after passing through the outdoor heat exchanger 30, forming a refrigerant cycle. When the first or second operating mode before or after the controller executes the mode switching command is pure domestic hot water mode, the opening and closing state of the first switching valve 60 is adjusted to allow the heat pump system to switch between pure domestic hot water mode and other operating modes. However, when the heat pump system is in any operating mode other than the pure domestic hot water mode, the first switch valve 60 is in the open state. If the first switch valve 60 is directly activated when the heat pump system switches between the pure domestic hot water mode and other operating modes, it will cause a sudden change in the refrigerant flow, which may lead to high and low pressure imbalance of the compressor 10, pipeline impact, or even burnout of the compressor 10. Therefore, in this embodiment, before activating the first switch valve 60, it is necessary to control the heat pump system to shut down. That is, after shutting down the heat pump system, the heat pump system is restarted in the second operating mode. When the heat pump system is shut down, the compressor 10 is also shut down. In this way, by shutting down the heat pump system, the safety of the heat pump system when switching between the pure domestic hot water mode and the cooling + domestic hot water mode, the heating + domestic hot water mode, the pure cooling mode, or the pure heating mode can be guaranteed, and the stability and reliability of the heat pump system operation can be improved.

[0061] Specifically, in this embodiment, when the first operating mode is a pure domestic hot water mode and the second operating mode is a non-pure domestic hot water mode, the first switching valve 60 is opened. This allows the refrigerant exiting the compressor outlet 12 to be diverted before entering the hot water module 20. A portion enters the hot water module 20 for producing domestic hot water, while the other portion flows through the pipe connected to the first switching valve 60 to other modules such as the indoor unit 50 or the outdoor heat exchanger 30. This enables operating modes other than producing domestic hot water, such as heating and cooling, and facilitates switching between pure domestic hot water mode and non-pure domestic hot water mode.

[0062] Specifically, in this embodiment, when the first operating mode is a non-pure domestic hot water mode and the second operating mode is a pure domestic hot water mode, the first switching valve 60 is closed. This ensures that the refrigerant exiting the compressor outlet 12 no longer enters the indoor unit 50 or other modules such as the outdoor heat exchanger 30 through the pipe connected to the first switching valve 60, but instead entirely enters the hot water module 20 to operate in pure domestic hot water mode, thus achieving the switch from a non-pure domestic hot water mode to a pure domestic hot water mode.

[0063] It is understood that in other embodiments, when the first operating mode or the second operating mode is a pure domestic hot water mode, mode switching can be performed directly without controlling the heat pump system to shut down. For example: when the first operating mode is a pure domestic hot water mode and the second operating mode is a non-pure domestic hot water mode, the first switch valve 60 is directly controlled to open; and / or, when the first operating mode is a non-pure domestic hot water mode and the second operating mode is a pure domestic hot water mode, the first switch valve 60 is directly controlled to close.

[0064] Specifically, when the first operating mode is a pure domestic hot water mode and the second operating mode is a heating + domestic hot water mode, the heat pump system control method of this embodiment includes: Control the heat pump system to shut down; The first switch valve 60 is switched from closed to open to detect whether there is a water tank-related fault in the hot water module 20. If so, the heat pump system is controlled to start and run in pure heating mode. Otherwise, the first expansion valve 70 is controlled to adjust to the initial opening based on the heating + domestic hot water mode, and the first expansion valve 70 is controlled to start timing and adjust the opening to switch the heat pump system from pure domestic hot water mode to heating + domestic hot water mode.

[0065] In this embodiment, the first operating mode is pure domestic hot water mode and the second operating mode is heating + domestic hot water mode, indicating that the controller needs to switch the heat pump system from pure domestic hot water mode to heating + domestic hot water mode. See [link to relevant documentation] Figure 3As shown, in this embodiment, when the heat pump system is in heating + domestic hot water mode, the refrigerant not only circulates between the compressor 10, the hot water module 20, and the outdoor heat exchanger 30 to produce domestic hot water, but also a portion of the refrigerant enters the indoor unit 50 through the compressor 10 for heat exchange before entering the outdoor heat exchanger 30 to merge with the refrigerant flowing through the hot water module 20, thus achieving indoor heating and domestic hot water production. When controlling the heat pump system to switch from pure domestic hot water mode to heating + domestic hot water mode, it is necessary to control the first switch valve 60 to switch from the closed state to the open state. Before controlling the first switch valve 60 to act, it is necessary to control the heat pump system to perform a shutdown transition. After the first switch valve 60 switches from the closed state to the open state, a portion of the high-temperature and high-pressure refrigerant flowing out of the compressor outlet 12 can be diverted to the indoor unit 50, where it undergoes heat exchange at the indoor heat exchanger 51 to achieve indoor heating and increase the indoor temperature. In the heating + domestic hot water mode, domestic hot water still needs to be produced through the hot water module 20. However, when the hot water module 20 has a tank-related fault, such as a faulty electric heating element or a faulty temperature sensor, it cannot produce hot water normally. Forcing operation may damage the heating element. Furthermore, the hot water module 20 cannot accurately control the water temperature when it has a tank-related fault, posing a significant safety hazard. Therefore, when the first operating mode is pure domestic hot water mode, the second operating mode is heating + domestic hot water mode, or a tank-related fault is detected in the hot water module 20, the controller will no longer control the heat pump system to operate in heating + domestic hot water mode. Instead, it will control the heat pump system to operate in pure heating mode. This prevents refrigerant from entering the hot water module 20 and, while ensuring the safe operation of the heat pump system, at least meets the user's heating needs.

[0066] In one embodiment, when there is no tank-related fault in the hot water module 20, the heat pump system is controlled to start operating in heating + domestic hot water mode. At this time, based on the heating + domestic hot water mode, the first expansion valve 70 is adjusted to its initial opening. The initial opening is a pre-set opening of the first expansion valve 70 in the heating + domestic hot water mode, which allows the refrigerant flow to better adapt to the start-up requirements of the heating + domestic hot water mode, ensuring the stability and safety of the hot water + domestic hot water mode startup. After the first expansion valve 70 is adjusted to its initial opening, the first expansion valve 70 is controlled to start timing and adjusting its opening, so that the first expansion valve 70 can dynamically adjust the refrigerant flow to better adapt to the operating requirements of the heating + domestic hot water mode and to protect the heat pump system. The gradual opening adjustment of the first expansion valve 70 triggered by the timer avoids pressure fluctuations caused by sudden changes in refrigerant flow, ensuring the effect of heating and domestic hot water production.

[0067] Specifically, when the first operating mode is heating + domestic hot water mode and the second operating mode is pure domestic hot water mode, the heat pump system control method of this embodiment includes: When the first operating mode is heating + domestic hot water mode and the second operating mode is pure domestic hot water mode, the heat pump system is shut down. The system checks whether there is a water tank malfunction in the hot water module 20. If so, it stops starting the heat pump system. Otherwise, it controls the first switch valve 60 to switch from open to closed and adjusts the opening of the first expansion valve 70 based on the pure domestic hot water mode, so that the heat pump system switches from heating + domestic hot water mode to pure domestic hot water mode.

[0068] In this embodiment, the first operating mode is heating + domestic hot water mode and the second operating mode is pure domestic hot water mode, indicating that the controller needs to control the heat pump system to switch from heating + domestic hot water mode to pure domestic hot water mode. During the process of controlling the heat pump system to switch from heating + domestic hot water mode to pure domestic hot water mode, it is necessary to control the first switch valve 60 to switch from open state to closed state. Before controlling the first switch valve 60 to act, it is necessary to control the heat pump system to perform a shutdown conversion. After the first switch valve 60 switches from open state to closed state, all the high-temperature and high-pressure refrigerant flowing out of the compressor outlet 12 can enter the hot water module 20 through the first shut-off valve 91, exchange heat with the heat recovery heat exchanger in the hot water module 20 to produce hot water, and then return to the compressor 10 through the outdoor heat exchanger 30 and the compressor inlet 11. However, when the hot water module 20 has a water tank electric heating failure, water tank temperature sensor failure, or other water tank-related failures, it cannot heat the water in the water tank 23 normally or cannot control the heating temperature. When this failure exists, the heat pump system cannot operate normally in pure domestic hot water mode. Therefore, when the first operating mode is heating + domestic hot water mode, the second operating mode is pure domestic hot water mode, and a water tank-related fault is detected in the hot water module 20, stopping the heat pump system can improve the safety of the heat pump system.

[0069] In one embodiment, when there is no tank-related malfunction in the hot water module 20, the first switching valve 60 is directly controlled to switch from the open state to the closed state, allowing all the refrigerant to enter the hot water module 20 and exchange heat with the heat recovery heat exchanger to produce hot water. However, this can lead to excessive refrigerant flow in the hot water module 20. Therefore, it is necessary to further control the opening of the first expansion valve 70 so that the opening of the first expansion valve 70 can be adapted to the pure domestic hot water mode. This improves the stability of the heat pump system when operating in the pure domestic hot water mode and also avoids situations such as liquid return and liquid slugging in the compressor 10 due to excessive refrigerant flow, thereby improving the safety and reliability of the heat pump system.

[0070] In one embodiment, when the first operating mode is heating + domestic hot water mode and the second operating mode is pure domestic hot water mode, when it is detected that there is no water tank fault in the hot water module 20, it is also necessary to further detect the energization status of the four-way valve (reversing valve 80) and the current position of the first switching valve 60. When the four-way valve is energized, the first switching valve 60 is controlled to switch from the current position to the closed position, and the heat pump system is controlled to start operation based on the pure domestic hot water mode. If the four-way valve is de-energized, the first switching valve 60 is controlled to switch from the current position to the open position, and the compressor 10 is controlled to start to energize the four-way valve. When the energization time of the reversing valve is greater than 15 seconds, the first switching valve 60 is controlled to switch to the closed position, and the heat pump system is controlled to start operation based on the pure domestic hot water mode.

[0071] When the four-way valve is energized, the valve coil is powered on, and the slider inside the valve moves under the action of electromagnetic force, changing the refrigerant flow path. When the four-way valve is de-energized, the valve coil is de-energized, and the slider returns to its initial position under the action of a spring or other reset mechanism, switching the refrigerant path.

[0072] In this embodiment, by separately detecting the energized state of the four-way valve and the position of the first switching valve 60 to control the action of the first switching valve 60, it is possible to ensure that the refrigerant circuit can be smoothly and safely switched from the heating + domestic hot water mode to the pure domestic hot water mode. When the four-way valve is energized, the first switching valve 60 is directly switched to the closed position, which can quickly cut off the refrigerant flow in the heating branch and avoid ineffective refrigerant diversion affecting the hot water efficiency. When the four-way valve is de-energized, the compressor 10 is started first to energize the four-way valve and maintain it for a first preset time (e.g., 15 seconds). After the four-way valve has completed its switching action and its state is stable, the first switching valve 60 is switched to the closed position. This can effectively avoid problems such as abnormal refrigerant circuit pressure and high and low pressure shocks of the compressor 10 caused by incomplete switching of the four-way valve. At the same time, it ensures that the refrigerant flows to the hot water module in the pure domestic hot water mode, improves the hot water efficiency and system operation stability, and prevents core components from being damaged due to sudden changes in operating conditions.

[0073] In one embodiment, when the first operating mode is a pure cooling mode and the second operating mode is a cooling + domestic hot water mode, the control method of this embodiment further includes: The first switch valve 60 is kept open, and the first expansion valve 70 is adjusted to its initial opening based on the cooling + domestic hot water mode. The first expansion valve 70 is then controlled to start timing and adjust its opening, so that the heat pump system switches from pure cooling mode to cooling + domestic hot water mode.

[0074] In this embodiment, the first operating mode being pure cooling mode and the second operating mode being cooling + domestic hot water mode indicates that the controller needs to switch the heat pump system from pure cooling mode to cooling + domestic hot water mode. (See also...) Figure 6 As shown, in this embodiment, when the heat pump system is in pure cooling mode, the high-temperature, high-pressure refrigerant flowing from the compressor outlet 12 directly enters the outdoor heat exchanger 30 and then returns to the compressor via the indoor unit 50 and compressor inlet 11 to cool the indoor unit. In this mode, the first switching valve 60 is in the open state. See also... Figure 5 As shown, in this embodiment, when the heat pump system is in cooling + domestic hot water mode, the first shut-off valve 91 is open, allowing a portion of the high-temperature, high-pressure refrigerant to enter the hot water module 20 and exchange heat with the heat recovery heat exchanger, thus simultaneously achieving cooling and domestic hot water production. Therefore, regardless of whether the heat pump system is in pure cooling mode or cooling + domestic hot water mode, the first switching valve 60 is always open. Thus, when switching the heat pump system from pure cooling mode to cooling + domestic hot water mode, it is not necessary to control the first switching valve 60; simply keeping it open is sufficient. To ensure stable and safe operation of the heat pump system in cooling + domestic hot water mode, the first expansion valve 70 needs to be adjusted to its initial opening, ensuring that the refrigerant flow rate in different pipes of the heat pump system meets the startup requirements of the cooling + domestic hot water mode. After the opening of the first expansion valve 70 is adjusted to the initial opening, the first expansion valve 70 is further controlled to start timing and adjust the opening, so as to realize the dynamic adjustment of refrigerant flow and protection of heat pump system. The timer will trigger the gradual opening adjustment of the first expansion valve 70 to avoid pressure fluctuation caused by sudden flow changes, thereby improving the stability and safety of heat pump system when operating in cooling + domestic hot water mode.

[0075] In one embodiment, when the first operating mode is a cooling + domestic hot water mode and the second operating mode is a pure cooling mode, the control method of this embodiment further includes: The first switch valve 60 is kept open, and the first expansion valve 70 is adjusted to the first target opening degree based on the pure cooling mode, so that the heat pump system switches from the cooling + domestic hot water mode to the pure cooling mode.

[0076] In this embodiment, the first operating mode is cooling + domestic hot water mode and the second operating mode is pure cooling mode, indicating that the controller needs to control the heat pump system to switch from cooling + domestic hot water mode to pure cooling mode. Similarly, when the heat pump system needs to switch from cooling + domestic hot water mode to pure cooling mode, it is not necessary to control the first switching valve 60. Simply keep the first switching valve 60 open. In pure cooling mode, part of the high-temperature and high-pressure refrigerant flowing out of the compressor outlet 12 enters the outdoor heat exchanger 30, and then enters the indoor unit 50 through the outdoor heat exchanger 30 to exchange heat with the indoor heat exchanger 51 to achieve cooling. Finally, it returns to the compressor 10 through the compressor inlet 11. The other part passes through the hot water module 20 for heat exchange and merges with the refrigerant flowing through the outdoor heat exchanger 30. Therefore, when the heat pump system switches from cooling + domestic hot water mode to pure cooling mode, it is necessary to adjust the opening of the first expansion valve 70 to the first target opening EEV-heat1 to control the refrigerant flow into the hot water module 20, ensure the heat exchange requirements of the indoor heat exchanger 51 of the indoor unit 50, maintain stable cooling effect, and ensure the cooling effect of the heat pump system.

[0077] Specifically, when the first operating mode is a pure heating mode and the second operating mode is a heating + domestic hot water mode, the control method in this embodiment further includes: The first switch valve 60 is kept open. Based on the heating + domestic hot water mode, the first expansion valve 70 is adjusted to the initial opening. The first expansion valve 70 is then controlled to start timing and adjust the opening, so that the heat pump system switches from pure heating mode to heating + domestic hot water mode.

[0078] In this embodiment, the first operating mode being pure heating mode and the second operating mode being heating + domestic hot water mode indicates that the controller needs to switch the heat pump system from pure heating mode to heating + domestic hot water mode. (See also...) Figure 5As shown, in this embodiment, when the heat pump system is in pure heating mode, the high-temperature, high-pressure refrigerant flowing from the compressor outlet 12 first enters the indoor unit 50 and exchanges heat with the indoor heat exchanger 51 to achieve indoor heating. Then, the refrigerant returns to the compressor 10 through the outdoor heat exchanger 30 and the compressor inlet 11. Similar to the heating + domestic hot water mode, the first switching valve 60 is always in the open state. Therefore, in this embodiment, when it is necessary to control the heat pump system to switch from pure heating mode to heating + domestic hot water mode, it is not necessary to control the switching state of the first switching valve 60. It is sufficient to keep the first switching valve 60 in the open state. Then, based on the heating + domestic hot water mode, the first expansion valve 70 is adjusted to the initial opening, which allows the refrigerant flow to better adapt to the start-up requirements of the heating + domestic hot water mode, ensuring the stability and safety of the hot water + domestic hot water mode start-up. After the first expansion valve 70 is adjusted to its initial opening, the control of the first expansion valve 70 starts timing and adjusting its opening, so that the first expansion valve 70 can dynamically adjust the refrigerant flow to better adapt to the operation requirements of the heating + domestic hot water mode and to protect the heat pump system. The timer triggers the gradual opening adjustment of the first expansion valve 70 to avoid pressure fluctuations caused by sudden changes in refrigerant flow, thus ensuring the heating and domestic hot water production effects.

[0079] Specifically, when the first operating mode is a heating + domestic hot water mode and the second operating mode is a pure heating mode, the control method of this embodiment further includes: The first switch valve 60 is kept open, the first expansion valve 70 is adjusted to the second target opening based on the pure heating mode, and the temperature is adjusted according to the water temperature of the hot water module 20 so that the heat pump system switches from the heating + domestic hot water mode to the pure heating mode.

[0080] In this embodiment, the first operating mode is heating + domestic hot water mode and the second operating mode is pure heating mode, indicating that the controller needs to switch the heat pump system from heating + domestic hot water mode to pure heating mode. Similarly, when it is necessary to switch the heat pump system from heating + domestic hot water mode to pure heating mode, it is not necessary to control the first switching valve 60. Instead, the first expansion valve 70 is directly adjusted to the second target opening degree EEV-heat2 based on the pure heating mode. The second target opening degree EEV-heat2 is the opening degree set in advance according to the pure heating mode, which can significantly reduce the refrigerant flow into the hot water module 20, ensuring that more refrigerant can enter the indoor unit 50 for heating, thus significantly improving the heating effect of the heat pump system. At the same time, it is also necessary to adjust the temperature according to the water temperature of the hot water module 20 to prevent abnormal situations such as high pressure caused by excessively high water temperature in the water tank 23 of the hot water module 20. When adjusting the temperature according to the water temperature of the hot water module 20, it is possible to further adjust according to the subcooling of the refrigerant to improve the adjustment effect and accuracy.

[0081] In one embodiment, when the heat pump system is in cooling + hot water mode, the control method of this embodiment further includes: Determine whether all powered-on indoor units 50 have entered the temperature-reaching state. The temperature-reaching state means that the indoor temperature detected by the indoor unit 50 has reached the cooling target temperature and has remained there for a preset time. If so, it is determined that the hot water capacity demand of the heat pump system is met, and the heat pump system is controlled to switch from cooling + hot water mode to pure cooling mode.

[0082] In this embodiment, when all indoor units 50 that are turned on have reached the temperature, it indicates that the indoor cooling load has dropped to an extremely low level. If the heat pump system continues to operate in the cooling + domestic hot water mode, the refrigerant distribution of the hot water module 20 will cause insufficient refrigerant in the cooling circuit between the compressor 10, the outdoor heat exchanger 30 and the indoor unit 50, resulting in the compressor 10 operating in a low-load and inefficient state. After all indoor units 50 have reached the temperature, the heat pump system is switched to the pure cooling mode. The opening and closing adjustment of the first expansion valve 70 can reduce the ineffective diversion of refrigerant to the hot water module 20, so that all the refrigerant is concentrated in the cooling circuit, which avoids energy waste and allows the compressor 10 to operate in a more efficient operating range. When the indoor unit 50 reaches the temperature target, if the heat pump system still maintains the cooling + domestic hot water mode, the refrigerant flow fluctuation in the cooling circuit will cause the heat exchange capacity of the indoor heat exchanger 51 (equivalent to the evaporator) to be unstable, which may easily lead to fluctuating indoor temperature. After switching to pure cooling mode, the refrigerant flow is stable, which can accurately maintain the indoor temperature, avoid the indoor temperature from being too cold or rebounding, and improve the user's comfort.

[0083] In one embodiment, see Figure 7 As shown, another structure of the heat pump system in this embodiment also includes a floor heating module 220. Therefore, in addition to operating in pure domestic hot water mode, heating + domestic hot water mode, cooling + domestic hot water mode, pure heating mode, and pure cooling mode, the heat pump system in this embodiment can also operate in pure floor heating mode, floor heating + domestic hot water mode, and floor heating + heating mode. Among them, pure floor heating mode means that only the compressor 10, the outdoor heat exchanger 30, and the floor heating module 220 form a refrigerant circulation in the heat pump system, and the refrigerant exchanges heat with the floor heating heat exchanger 221 to achieve floor heating or floor cooling; floor heating + domestic hot water mode means that hot water is produced simultaneously through the hot water module 20, and floor heating or floor cooling is achieved simultaneously through the floor heating module 220; floor heating + heating mode means that the floor heating module 220 and the indoor unit 50 operate simultaneously. Since the floor heating module 220 and the indoor unit 50 are in parallel, the floor heating module 220 can achieve floor heating when the indoor unit 50 is heating, or it can achieve floor heating independently.

[0084] In this embodiment, the specific control process for the heat pump system to switch from pure underfloor heating mode to underfloor heating + domestic hot water mode is the same as the process for controlling the heat pump system to switch from pure heating mode to heating + domestic hot water mode, the process for controlling the heat pump system to switch from underfloor heating + domestic hot water mode to pure underfloor heating mode is the same as the process for controlling the heat pump system to switch from heating + domestic hot water mode to pure heating mode, the process for controlling the heat pump system to switch from pure domestic hot water mode to underfloor heating + domestic hot water mode is the same as the process for controlling the heat pump system to switch from pure domestic hot water mode to heating + domestic hot water mode, and the process for controlling the heat pump system to switch from underfloor heating + domestic hot water mode to pure domestic hot water mode is the same as the process for controlling the heat pump system to switch from heating + domestic hot water mode to pure domestic hot water mode. Therefore, this application does not describe in detail the mode switching process corresponding to the operation of this underfloor heating module 220.

[0085] like Figure 9 As shown, this application embodiment also provides an electronic device 300, which includes a memory 301 and a processor 303; wherein, The memory 301 is used to store computer programs; The processor 303 is used to execute the computer program to implement the defrosting method of the heat pump system described above.

[0086] Specifically, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, when the computer program is downloaded, installed, and executed by an electronic device, it performs the functions defined above in the methods of the embodiments of the present invention. The electronic device in the present invention can be a terminal such as a laptop, desktop computer, tablet computer, or smartphone, or it can be a server.

[0087] This application also provides a computer storage medium storing a computer program, which, when executed by a processor, implements the defrosting method of the heat pump system described above. Specifically, it should be noted that the computer-readable medium described above can be a computer-readable signal medium, a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. The transmitted data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0088] The aforementioned computer-readable medium may be included in the aforementioned electronic device; or it may exist independently and not assembled into the electronic device.

[0089] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects: (1) The structure and corresponding control logic of the heat pump system in this implementation are simple, and the heat pump system has high stability. (2) The heat pump system can simultaneously realize three functions: cooling, heating and domestic hot water production; (3) Partial heat recovery can be achieved in the summer cooling mode, which improves the energy consumption of the heat pump system; (4) Terminal modules can be selected according to the needs of different users to achieve a combination of multiple functions; (5) The heat pump system in this embodiment only needs a first switching valve and a heat recovery expansion valve (first expansion valve) at the outlet of the heat recovery heat exchanger to realize multiple mode switching, such as pure cooling mode, pure heating mode, cooling + domestic hot water mode, pure domestic hot water mode, and heating + domestic hot water mode. During the mode switching process, except for the four-way valve, it is only necessary to change the opening and closing of the first switching valve during the change from pure domestic hot water mode to other modes. For other modes, it is only necessary to adjust the opening of the first expansion valve to match different operating modes, so that the stability of the heat pump system is significantly improved while realizing multi-mode switching.

[0090] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0091] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0092] The above are merely some embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method for a heat pump system, characterized in that, The heat pump system includes a compressor (10), a hot water module (20), an outdoor heat exchanger (30), a throttling element, and an indoor unit (50) all located in the same refrigerant circulation loop. The compressor (10) has a first on / off valve (60) at its outlet, and the hot water module (20) has a first expansion valve (70) at its refrigerant outlet (22). The control method includes: Receive a mode switching command for the heat pump system, the mode switching command including a first operating mode before the mode switching of the heat pump system and a second operating mode after the mode switching of the heat pump system; Determine whether the first operating mode or the second operating mode is a pure domestic hot water mode; If so, the first switching valve (60) is controlled to operate, and the first expansion valve (70) is controlled to adjust its opening according to the second operating mode, so that the heat pump system switches from the first operating mode to the second operating mode.

2. The heat pump system control method according to claim 1, characterized in that, The control method includes: When the first operating mode or the second operating mode is a pure domestic hot water mode, the heat pump system is shut down. The heat pump system is restarted based on the second operating mode, the first switching valve (60) is controlled to operate and the opening of the first expansion valve (70) is adjusted so that the heat pump system switches from the first operating mode to the second operating mode.

3. The heat pump system control method according to claim 1 or 2, characterized in that, The control method includes: When the first operating mode is pure domestic hot water mode and the second operating mode is not pure domestic hot water mode, the first switching valve (60) is controlled to open; and / or When the first operating mode is a non-pure domestic hot water mode and the second operating mode is a pure domestic hot water mode, the first switch valve (60) is controlled to close.

4. The heat pump system control method according to claim 3, characterized in that, The control method includes: When the first operating mode is pure domestic hot water mode and the second operating mode is heating + domestic hot water mode, the heat pump system is shut down. Control the first switch valve (60) to switch from closed to open, detect whether there is a water tank fault in the hot water module (20), if so, control the heat pump system to start running in pure heating mode, otherwise, control the first expansion valve (70) to adjust to the initial opening based on the heating + domestic hot water mode, and control the first expansion valve (70) to start timing and adjust the opening, so that the heat pump system switches from the pure domestic hot water mode to the heating + domestic hot water mode.

5. The heat pump system control method according to claim 3, characterized in that, The control method includes: When the first operating mode is heating + domestic hot water mode and the second operating mode is pure domestic hot water mode, the heat pump system is shut down. If the hot water module (20) has a water tank malfunction, the heat pump system is stopped from starting. Otherwise, the first switch valve (60) is switched from open to closed based on the pure domestic hot water mode, and the opening of the first expansion valve (70) is adjusted so that the heat pump system switches from the heating + domestic hot water mode to the pure domestic hot water mode.

6. The heat pump system control method according to claim 1, characterized in that, The control method further includes: When the first operating mode is pure cooling mode and the second operating mode is cooling + domestic hot water mode, the first switching valve (60) is kept open, and the first expansion valve (70) is adjusted to its initial opening based on the cooling + domestic hot water mode. The first expansion valve (70) is also controlled to start timing and adjust its opening, so that the heat pump system switches from the pure cooling mode to the cooling + domestic hot water mode; and / or, When the first operating mode is cooling + domestic hot water mode and the second operating mode is pure cooling mode, the first switch valve (60) is controlled to remain open, and the first expansion valve (70) is controlled to adjust to the first target opening degree based on the pure cooling mode, so that the heat pump system switches from the cooling + domestic hot water mode to the pure cooling mode.

7. The heat pump system control method according to claim 1, characterized in that, The control method further includes: When the first operating mode is pure heating mode and the second operating mode is heating + domestic hot water mode, the first switching valve (60) is kept open, and the first expansion valve (70) is adjusted to its initial opening based on the heating + domestic hot water mode. The first expansion valve (70) is also controlled to start timing and adjust its opening, so that the heat pump system switches from the pure heating mode to the heating + domestic hot water mode; and / or, When the first operating mode is heating + domestic hot water mode and the second operating mode is pure heating mode, the first switch valve (60) is kept open, the first expansion valve (70) is adjusted to the second target opening based on the pure heating mode, and the temperature is adjusted according to the water temperature of the hot water module (20) so that the heat pump system switches from the heating + domestic hot water mode to the pure heating mode.

8. The heat pump system control method according to claim 1, characterized in that, The control method further includes: When the heat pump system is in cooling + hot water mode, it determines whether all the indoor units (50) that are turned on have entered the temperature-reaching state. The temperature-reaching state means that the indoor temperature detected by the indoor unit (50) has reached the cooling target temperature and has been maintained for a preset time. If so, it is determined that the hot water capacity requirement of the heat pump system is met, and the heat pump system is controlled to switch from the cooling + hot water mode to the pure cooling mode.

9. A heat pump system comprising a compressor (10), a hot water module (20), an outdoor heat exchanger (30), a throttling element, and an indoor unit (50) arranged in the same refrigerant circulation loop, characterized in that, The compressor (10) is provided with a first switching valve (60) at its outlet, and the hot water module (20) is provided with a first expansion valve (70) at its refrigerant outlet. The heat pump system also includes a controller, which is used to execute the heat pump system control method according to any one of claims 1 to 8.

10. An electronic device (300), characterized in that, Includes a memory (301) and a processor (303); wherein, The memory (301) is used to store computer programs; The processor (303) is used to execute the computer program to implement the heat pump system control method as described in any one of claims 1 to 8.

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