Heat pump system

Abstract

Disclosed in the present application is a heat pump system, comprising at least two indoor units, an outdoor main unit, an air pipe and a liquid pipe. Each indoor unit comprises a first refrigerant port and a second refrigerant port in communication with the first refrigerant port. The outdoor main unit comprises a first refrigerant pipe, a second refrigerant pipe, a refrigerant outlet pipe and a refrigerant inlet pipe, and the first refrigerant pipe is connected to a main port end of the air pipe. In each indoor unit, the first refrigerant port is connected to a corresponding branch port end in the air pipe, and the second refrigerant port is connected to a corresponding branch port end in the liquid pipe. The second refrigerant pipe is connected to a main port end of the liquid pipe. The refrigerant outlet pipe and the refrigerant inlet pipe are used for being externally connected to a domestic hot water module, so as to prepare hot water by means of heat exchange between a refrigerant and water. The liquid pipe and the air pipe are further used for externally connecting to a hydraulic module so as to realize heat exchange between the refrigerant and water. The present application reduces the weight of the outdoor main unit and enables main unit integration to evolve into system integration, and thus a user can also select the domestic hot water module and the hydraulic module according to requirements.

Description

heat pump system Technical Field

[0001] This application relates to the field of heat pump technology, and more particularly to a heat pump system. Background Technology

[0002] Existing heat pump systems are generally fixed configurations of dual or tri-generation systems, which users cannot select according to their actual needs. For example, for users in southern my country, some users feel that winters are short and they do not need underfloor heating, while others pursue comfort and have a need for underfloor heating. Alternatively, some users do not want to install underfloor heating at the time of installation but want to add it later. However, the existing technology cannot meet the needs of different users or the same user at different times at the same time.

[0003] In addition, dual-supply or triple-supply heat pump systems involve switching between multiple modes, which requires the main control board to operate the three-way valve to control the corresponding components for switching. Control errors can easily cause system instability. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a heat pump system that addresses at least one deficiency of the related technologies mentioned in the background art.

[0005] The technical solution adopted by this application to solve its technical problem is: constructing a heat pump system, including:

[0006] At least two indoor units, each indoor unit including a first refrigerant port and a second refrigerant port connected to the first refrigerant port;

[0007] An outdoor unit, the outdoor unit including a first refrigerant pipeline, a second refrigerant pipeline, a refrigerant outlet pipeline and a refrigerant inlet pipeline;

[0008] Trachea and fluid tubes;

[0009] The first refrigerant pipeline is connected to the main interface end of the gas pipe;

[0010] In each indoor unit, the first refrigerant port is connected to the corresponding branch end in the gas pipe, and the second refrigerant port is connected to the corresponding branch end in the liquid pipe.

[0011] The second refrigerant line is connected to the main interface end of the liquid line;

[0012] The refrigerant outlet pipe and the refrigerant inlet pipe are used to connect to an external domestic hot water module to produce hot water through heat exchange between the refrigerant and water;

[0013] The liquid pipe and the gas pipe are also used to connect to an external hydraulic module to realize heat exchange between the refrigerant and water.

[0014] This application also constructs a heat pump system, including:

[0015] Compressor. The compressor is used to compress refrigerant;

[0016] A domestic hot water heat exchanger, the domestic hot water heat exchanger including a first refrigerant inlet and a first refrigerant outlet connected to the first refrigerant inlet;

[0017] A high-pressure gas-liquid separator includes a second refrigerant inlet, a second refrigerant outlet connected to the second refrigerant inlet, and a third refrigerant outlet connected to the second refrigerant inlet; the second refrigerant outlet is used to output gaseous refrigerant after gas-liquid separation, and the third refrigerant outlet is used to output liquid refrigerant after gas-liquid separation.

[0018] An outdoor heat exchanger, at least one indoor unit, a first reversing valve, a second reversing valve, and a fifth switching valve;

[0019] The compressor outlet is connected to the first refrigerant inlet via the fifth switching valve, the first refrigerant outlet is connected to the second refrigerant inlet, the second refrigerant outlet is connected to the second refrigerant outlet via the first reversing valve, the second reversing valve is connected to the outdoor heat exchanger, the indoor unit and the compressor inlet, the third refrigerant outlet is connected to the indoor unit, and the outdoor heat exchanger is connected to the indoor unit.

[0020] When refrigeration and domestic hot water production are operating simultaneously, the first reversing valve keeps the second refrigerant outlet connected to the second reversing valve, and when all the heat of the refrigerant is exchanged in the domestic hot water heat exchanger, the refrigerant forms a first flow path from the compressor outlet through the fifth switching valve, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, the third refrigerant outlet, the indoor unit, the second reversing valve, and the compressor inlet;

[0021] When refrigeration and domestic hot water production are operating simultaneously, the first reversing valve keeps the second refrigerant outlet connected to the second reversing valve, and when part of the heat of the refrigerant is exchanged in the domestic hot water heat exchanger, the refrigerant forms a second flow path from the compressor outlet through the fifth switching valve, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, the second refrigerant outlet, the first reversing valve, the second reversing valve, the outdoor heat exchanger, the indoor unit, the second reversing valve, and the compressor inlet.

[0022] This application also constructs a heat pump system, including:

[0023] The compressor is used to compress refrigerant;

[0024] A phase change heat exchanger, the phase change heat exchanger including a heat exchange refrigerant inlet and a heat exchange refrigerant outlet connected to the heat exchange refrigerant inlet;

[0025] A high-pressure gas-liquid separator includes a second refrigerant inlet, a second refrigerant outlet connected to the second refrigerant inlet, and a third refrigerant outlet connected to the second refrigerant inlet; the second refrigerant outlet is used to output gaseous refrigerant after gas-liquid separation, and the third refrigerant outlet is used to output liquid refrigerant after gas-liquid separation.

[0026] An outdoor heat exchanger, at least one indoor unit, a first reversing valve, a second reversing valve, and a fifth switching valve;

[0027] The compressor outlet is connected to the heat exchange refrigerant inlet via the fifth switching valve, the heat exchange refrigerant outlet is connected to the second refrigerant inlet, the second refrigerant outlet is connected to the second refrigerant outlet via the first reversing valve, the second reversing valve is connected to the outdoor heat exchanger, the indoor unit and the compressor inlet, the third refrigerant outlet is connected to the indoor unit, and the outdoor heat exchanger is connected to the indoor unit.

[0028] When cooling and domestic hot water production are running simultaneously, the first reversing valve keeps the second refrigerant outlet connected to the second refrigerant outlet, and when all the heat of the refrigerant is exchanged in the phase change heat exchanger, the refrigerant forms a first flow path from the compressor outlet through the fifth switching valve, the heat exchange refrigerant inlet, the heat exchange refrigerant outlet, the second refrigerant inlet, the third refrigerant outlet, the indoor unit, the second reversing valve, and the compressor inlet;

[0029] When refrigeration and domestic hot water production are operating simultaneously, the first reversing valve keeps the second refrigerant outlet connected to the second reversing valve, and when part of the heat of the refrigerant is exchanged in the phase change heat exchanger, the refrigerant forms a second flow path from the compressor outlet through the fifth switching valve, the heat exchange refrigerant inlet, the heat exchange refrigerant outlet, the second refrigerant inlet, the second refrigerant outlet, the first reversing valve, the second reversing valve, the outdoor heat exchanger, the indoor unit, the second reversing valve, and the compressor inlet.

[0030] By implementing this application, the following beneficial effects can be achieved:

[0031] The outdoor unit of this application has a refrigerant outlet pipe and a refrigerant inlet pipe for connecting the domestic hot water module, as well as a liquid pipe and a gas pipe for connecting the hydraulic module. Therefore, the domestic hot water module and the hydraulic module can be modularized, thereby reducing the weight of the outdoor unit and enabling the integration of the unit into the system. Users can also select the domestic hot water module and the hydraulic module according to their actual needs, which improves flexibility.

[0032] In addition, in both the cooling and total heat recovery domestic hot water system and the cooling and partial heat recovery domestic hot water system, the first reversing valve keeps the second refrigerant outlet of the high-pressure gas-liquid separator connected to the second reversing valve. Therefore, when switching between the two modes, it is not necessary to activate the first reversing valve, but only the second reversing valve needs to be activated. The gas-liquid separation of the high-pressure gas-liquid separator can realize the automatic flow direction of refrigerant when switching between modes, thereby improving the stability of the system. Attached Figure Description

[0033] The present application will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0034] Figure 1 is a first schematic diagram of the heat pump system of this application;

[0035] Figure 2 is a second schematic diagram of the heat pump system of this application;

[0036] Figure 3 is a third schematic diagram of the heat pump system of this application;

[0037] Figure 4 is a fourth schematic diagram of the heat pump system of this application;

[0038] Figure 5 is a schematic diagram of the refrigerant flow direction in the heat pump system shown in Figure 1, which produces hot water through total heat recovery mode while cooling.

[0039] Figure 6 is a schematic diagram of the flow direction of the first refrigerant in the heat pump system shown in Figure 1, which produces hot water through waste heat recovery while cooling.

[0040] Figure 7 is a schematic diagram of the flow direction of the second refrigerant in the heat pump system shown in Figure 1, which produces hot water through waste heat recovery while cooling.

[0041] Figure 8 is a schematic diagram of the flow direction of the first refrigerant in the heat pump system shown in Figure 1, which produces hot water while cooling.

[0042] Figure 9 is a schematic diagram of the flow direction of the second refrigerant in the heat pump system shown in Figure 1, which produces hot water while cooling.

[0043] Figure 10 is a schematic diagram of the refrigerant flow direction of the heat pump system shown in Figure 1 when it is purely producing hot water;

[0044] Figure 11 is a schematic diagram of the refrigerant flow direction during cooling in the heat pump system shown in Figure 1;

[0045] Figure 12 is a schematic diagram of the refrigerant flow direction of the heat pump system shown in Figure 1 during heating;

[0046] Figure 13 is a schematic diagram of the refrigerant flow direction in the heat pump system shown in Figure 2, which produces hot water through total heat recovery mode while cooling.

[0047] Figure 14 is a schematic diagram of the refrigerant flow direction in the heat pump system shown in Figure 2 when it is purely preparing hot water. Detailed Implementation

[0048] To provide a clearer understanding of the technical features, objectives, and effects of this application, the specific embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0050] It should be noted that the connections between ports, between ports and components, or between components described below are only physical structural connections and do not uniquely define the connectivity or refrigerant flow relationship.

[0051] Understandably, at least one of the following can be one, two, three, or any number.

[0052] First embodiment:

[0053] As shown in Figures 1, 2, and 3, this application discloses a heat pump system, including at least two indoor units 10, an outdoor unit 20, a gas pipe 30, and a liquid pipe 40. It is understood that the "at least two" units can be two, three, or any number. The specific details of the heat pump system are as follows:

[0054] The indoor unit 10 is used to realize heat exchange between refrigerant and indoor air. The indoor unit 10 includes a first refrigerant port 101 and a second refrigerant port 102 connected to the first refrigerant port 101. The outdoor unit 20 includes a first refrigerant pipe 201, a second refrigerant pipe 202, a refrigerant outlet pipe 203, and a refrigerant inlet pipe 204.

[0055] The first refrigerant pipe 201 is connected to the main interface of the gas pipe 30. In each indoor unit 10, the first refrigerant port 101 is connected to the corresponding branch interface of the gas pipe 30, and the second refrigerant port 102 is connected to the corresponding branch interface of the liquid pipe 40. The second refrigerant pipe 202 is connected to the main interface of the liquid pipe 40.

[0056] The refrigerant outlet pipe 203 and refrigerant inlet pipe 204 are used to connect to the external domestic hot water module 50, which produces hot water through heat exchange between the refrigerant and water. The liquid pipe 40 and gas pipe 30 are also used to connect to the external hydraulic module 60 to realize heat exchange between the refrigerant and water.

[0057] The heat pump system in this embodiment can modularize both domestic hot water and hydraulic modules, thereby reducing the weight of the outdoor unit 20 and integrating the unit into the system. Users can also select the domestic hot water module 50 and the hydraulic module 60 according to their actual needs, improving flexibility. Furthermore, the indoor unit 10 can also be installed selectively according to actual requirements.

[0058] In some embodiments, as shown in Figures 1, 2, and 3, the outdoor unit 20 further includes a first switching valve 205, a second switching valve 206, a third switching valve 207, and a fourth switching valve 208. The first switching valve 205 is located on the first refrigerant line 201, the second switching valve 206 is located on the second refrigerant line 202, the third switching valve 207 is located on the refrigerant outlet line 203, and the fourth switching valve 208 is located on the refrigerant inlet line 204. For example, the first switching valve 205, the second switching valve 206, the third switching valve 207, and the fourth switching valve 208 are all shut-off valves. These shut-off valves are merely examples and are not intended to limit the scope of this application; other types may also be used.

[0059] In some embodiments, as shown in Figures 1, 2 and 3, when a user needs to configure or use the domestic hot water module 50, the domestic hot water module 50 can be connected to the refrigerant outlet pipe 203 and the refrigerant inlet pipe 204. Therefore, the heat pump system also includes the domestic hot water module 50, which is used to produce hot water through heat exchange between the refrigerant and water.

[0060] In some embodiments, as shown in Figures 1, 2 and 3, the domestic hot water module 50 includes a domestic hot water heat exchanger 501a and a first domestic water tank 502. The domestic hot water heat exchanger 501a is used to realize heat exchange between the refrigerant and the water in the first domestic water tank 502, and the first domestic water tank 502 is used to store domestic water.

[0061] The domestic hot water heat exchanger 501a includes a first refrigerant inlet 5011a, a first refrigerant outlet 5012a connected to the first refrigerant inlet 5011a, a first water inlet 5013a, and a first water outlet 5014a connected to the first water inlet 5013a. The first refrigerant inlet 5011a is connected to the refrigerant outlet pipe 203, and the first refrigerant outlet 5012a is connected to the refrigerant inlet pipe 204. The first domestic water tank 502 is connected to both the first water inlet 5013a and the first water outlet 5014a of the domestic hot water heat exchanger 501a.

[0062] For example, the domestic hot water heat exchanger 501a is a shell-and-tube heat exchanger. The shell-and-tube heat exchanger here is just an example and is not intended to limit this application. Other types are also possible.

[0063] In some embodiments, as shown in Figures 1, 2 and 3, the first domestic water tank 502 includes a first cold water inlet 5021, a first water outlet 5022, a first return water outlet 5023 and a first hot water outlet 5024. The first water outlet 5022 is connected to the first water inlet 5013a of the domestic hot water heat exchanger 501a, and the first water outlet 5014a of the domestic hot water heat exchanger 501a is connected to the first return water outlet 5023.

[0064] In some embodiments, as shown in Figures 1, 2 and 3, the domestic hot water module 50 further includes a first water pump 503. The first water pump 503 is disposed in the inlet pipe (i.e., the pipe connecting the first outlet 5022 and the first water inlet 5013a) or the outlet pipe (i.e., the pipe connecting the first water outlet 5014a and the first return water inlet 5023) of the domestic hot water heat exchanger 501a. The first water pump 503 is used to provide power for the water circulation between the domestic hot water heat exchanger 501a and the first domestic water tank 502.

[0065] In this embodiment, the domestic hot water module 50 is placed outside the outdoor unit 20, which can reduce the weight of the outdoor unit 20. Users can also choose to equip the domestic hot water module 50 according to their actual needs.

[0066] In some other embodiments, the domestic hot water module 50 of Figure 1 can be replaced, as shown in Figure 4. The domestic hot water module 50 includes a phase change heat exchanger 501b, which is filled with a phase change medium. The phase change medium absorbs all or at least part of the heat from the refrigerant flowing through it during the phase change process and stores it, and exchanges heat with the water flowing through it, thereby storing a large amount of heat. The heat is released only when needed. It should be noted that because the phase change medium can store heat, the absorption of heat from the refrigerant does not need to occur only when water is flowing through it, i.e., it does not need to be like the domestic hot water heat exchanger 501a.

[0067] The phase change heat exchanger 501b includes a heat exchange refrigerant inlet 5011b, a heat exchange refrigerant outlet 5012b connected to the heat exchange refrigerant inlet 5011b, a third water inlet 5013b, and a third water outlet 5014b connected to the third water inlet 5013b. The heat exchange refrigerant inlet 5011b is connected to the refrigerant outlet pipe 203, and the heat exchange refrigerant outlet 5012b is connected to the refrigerant inlet pipe 204. The third water inlet 5013b is used to connect to external tap water, and the third water outlet 5014b is used to supply domestic hot water.

[0068] A phase change medium storing heat is used to release heat during the phase change process. Specifically, cold water enters the third water inlet 5013b of the phase change heat exchanger 501b. The cold water causes the phase change medium storing heat to undergo a phase change in the phase change heat exchanger 501b, releasing heat during the phase change process and exchanging heat with the cold water. Hot water is output from the third water outlet 5014b of the phase change heat exchanger 501b.

[0069] To improve heat exchange efficiency, the phase change heat exchanger 501b includes a first pipe (not shown) and a second pipe (not shown). The first pipe connects the heat exchange refrigerant inlet 5011b and the heat exchange refrigerant outlet 5012b, and the second pipe connects the third water inlet 5013b and the third water outlet 5014b. The first and second pipes are at least partially intertwined. It is understood that "at least partially" can be partially or completely intertwined. It should be noted that "intertwined" in this application includes the first and second pipes being directly attached and intertwined, and the first and second pipes maintaining a certain gap but still being intertwined.

[0070] It should be noted that Figure 4 is based on Figure 1 with the domestic hot water module 50 replaced. Alternatively, the domestic hot water modules 50 in Figures 2 and 3 can be replaced with the domestic hot water module 50 in Figure 4. Further details will not be provided here.

[0071] In some other embodiments, the domestic hot water module 50 of FIG4 also includes a second domestic water tank (not shown), a phase change heat exchanger 501b for realizing heat exchange between the refrigerant and the water in the second domestic water tank, and the second domestic water tank for storing domestic water. The second domestic water tank is connected to the third water inlet 5013b and the third water outlet 5014b of the phase change heat exchanger 501b, respectively.

[0072] The second domestic water tank includes a second cold water inlet, a third water outlet, a third return water outlet, and a second hot water outlet. The third water outlet is connected to the third water inlet 5013b of the phase change heat exchanger 501b, and the third water outlet 5014b of the phase change heat exchanger 501b is connected to the third return water outlet.

[0073] The domestic hot water module 50 in Figure 4 also includes a third water pump (not shown). The third water pump is installed in the inlet pipe (i.e., the pipe connecting the third outlet and the third water inlet 5013b) or the outlet pipe (i.e., the pipe connecting the third water outlet and the third return water inlet) of the phase change heat exchanger 501b. The third water pump is used to provide power for the water circulation between the phase change heat exchanger 501b and the second domestic water tank.

[0074] In other embodiments, the first domestic water tank 502 or the second domestic water tank can be replaced with a hot water user device (not shown). The first water inlet 5013a of the domestic hot water heat exchanger 501a or the third water inlet of the phase change heat exchanger 501b is connected to an external cold water source, and the first water outlet 5014a of the domestic hot water heat exchanger 501a or the third water outlet of the phase change heat exchanger 501b is connected to the hot water user device. For example, the external cold water source is tap water, and the hot water user device is a faucet or shower head in a bathroom, kitchen, or washbasin. Tap water and faucets or shower heads in bathrooms, kitchens, or washbasins are merely examples and are not limited. Other external cold water sources and other types of hot water user devices are also possible.

[0075] In some other embodiments, the first domestic water tank 502 or the second domestic water tank can be replaced with a hot water storage tank (not shown). The first water inlet 5013a of the domestic hot water heat exchanger 501a or the third water inlet of the phase change heat exchanger 501b is connected to an external cold water source, and the first water outlet 5014a of the domestic hot water heat exchanger 501a or the third water outlet of the phase change heat exchanger 501b is connected to the hot water storage tank.

[0076] In some embodiments, as shown in Figures 1, 2, and 3, when the user needs to configure or use the hydraulic module 60, the hydraulic module 60 can be connected to the liquid pipe 40 and the gas pipe 30. Therefore, the heat pump system also includes at least one hydraulic module 60. The hydraulic module 60 includes a heat exchanger 601, which is used to realize heat exchange between the refrigerant and the water in the external terminal 80, such as the terminal 80 being a ground pipe, to achieve underfloor cooling or underfloor heating effects.

[0077] The heat exchanger 601 includes a third refrigerant port 6011, a fourth refrigerant port 6012 connected to the third refrigerant port 6011, a second water inlet 6013, and a second water outlet 6014 connected to the second water inlet 6013.

[0078] The third refrigerant port 6011 is connected to the corresponding branch end in the gas pipe 30, and the fourth refrigerant port 6012 is connected to the corresponding branch end in the liquid pipe 40. The second water inlet 6013 and the second water outlet 6014 are used to connect to the external terminal 80.

[0079] The terminal 80 includes a second outlet 801 and a second return outlet 802. The second outlet 801 is connected to the second water inlet 6013, and the second water outlet 6014 is connected to the second return outlet 802.

[0080] In some embodiments, as shown in Figures 1, 2 and 3, the hydraulic module 60 further includes a second water pump 603, which is disposed on the pipeline of the second water inlet 6013 (i.e., the pipeline connecting the second water outlet 801 to the second water inlet 6013) or on the pipeline of the second water outlet 6014 (i.e., the pipeline connecting the second water outlet 6014 to the second return water outlet 802). The second water pump 603 is used to provide power for the water circulation between the heat exchanger 601 and the external terminal 80.

[0081] For example, heat exchanger 601 is a plate heat exchanger. The shell-and-tube heat exchanger mentioned here is just an example and is not intended to limit this application. Other types are also possible.

[0082] In some embodiments, as shown in Figures 1, 2 and 3, the hydraulic module 60 further includes a fifth throttling device 604, through which the fourth refrigerant port 6012 is connected to the corresponding branch port in the liquid pipe 40.

[0083] In this embodiment, the hydraulic module 60 is placed outside the outdoor unit 20, which can reduce the weight of the outdoor unit 20. Users can also select the hydraulic module 60 according to their actual needs.

[0084] In some embodiments, as shown in Figures 1, 2, and 3, the outdoor unit 20 further includes a compressor 209, a high-pressure gas-liquid separator 210, an outdoor heat exchanger 211, and a first throttling device 212, as detailed below:

[0085] Compressor 209 is used to compress refrigerant. High-pressure gas-liquid separator 210 includes a second refrigerant inlet 2101, a second refrigerant outlet 2102 connected to the second refrigerant inlet 2101, and a third refrigerant outlet 2103 connected to the second refrigerant inlet 2101. Second refrigerant outlet 2102 is used to output gaseous refrigerant after gas-liquid separation, and third refrigerant outlet 2103 is used to output liquid refrigerant after gas-liquid separation. Outdoor heat exchanger 211 is used to realize heat exchange between the refrigerant and the outside air. Outdoor heat exchanger 211 includes a fifth refrigerant port 2111 and a sixth refrigerant port 2112 connected to the fifth refrigerant port 2111.

[0086] The compressor 209 outlet is connected to the refrigerant outlet pipe 203. The second refrigerant inlet 2101 is connected to the refrigerant inlet pipe 204. The second refrigerant outlet 2102 is connected to the first refrigerant pipe 201 and the fifth refrigerant port 2111. The third refrigerant outlet 2103 is connected to the second refrigerant pipe 202 and the sixth refrigerant port 2112 via the first throttling device 212. The second refrigerant pipe 202 is connected to the sixth refrigerant port 2112. The fifth refrigerant port 2111 and the first refrigerant pipe 201 are connected to the compressor 209 inlet.

[0087] For example, the outdoor heat exchanger 211 is a finned heat exchanger, and the first throttling device 212 is an electronic expansion valve or a thermal expansion valve. The finned heat exchanger, electronic expansion valve and thermal expansion valve mentioned here are just examples and are not intended to limit this application.

[0088] In this embodiment, a high-pressure gas-liquid separator 210 is installed at the outlet end of the refrigerant inlet pipe 204. By using gas-liquid separation, the refrigerant flow direction can be automatically realized when switching between the cooling and total heat recovery domestic hot water production mode and the cooling and waste heat recovery domestic hot water production mode, as well as when switching between the heating and domestic hot water production mode and the pure hot water mode, thereby improving the stability of the system.

[0089] In some embodiments, when the heat pump system is equipped with a domestic hot water module 50, in the cooling and total heat recovery domestic hot water mode, the refrigerant, after exiting the compressor 209, forms a cooling refrigerant circuit through the refrigerant outlet pipe 203, the first refrigerant inlet 5011a (or heat exchange refrigerant inlet 5011b), the first refrigerant outlet 5012a (or heat exchange refrigerant outlet 5012b), the refrigerant inlet pipe 204, the second refrigerant inlet 2101, the third refrigerant outlet 2103, the first throttling device 212, the second refrigerant pipe 202, the liquid pipe 40, the second refrigerant port 102, the first refrigerant port 101, the gas pipe 30, and the first refrigerant pipe 201. At the same time, all the heat of the refrigerant is exchanged in the domestic hot water heat exchanger 501a (or the phase change heat exchanger 501b).

[0090] When the heat pump system is also equipped with a hydraulic module 60, in both cooling and total heat recovery domestic hot water modes, the refrigerant exits from the liquid pipe 40 and returns to the gas pipe 30 via the fourth refrigerant port 6012 and the third refrigerant port 6011. The refrigerant then exchanges heat with the water in the external terminal 80 at the heat exchanger 601, achieving, for example, a floor cooling effect. It should be noted that in both cooling and total heat recovery domestic hot water modes, the indoor unit 10 and the hydraulic module 60 can operate selectively or simultaneously.

[0091] In some embodiments, when the heat pump system is equipped with a domestic hot water module 50, in the cooling and waste heat recovery domestic hot water production mode, after the refrigerant comes out of the compressor 209, it forms a cooling refrigerant circuit through the refrigerant outlet pipe 203, the first refrigerant inlet 5011a (or heat exchange refrigerant inlet 5011b), the first refrigerant outlet 5012a (or heat exchange refrigerant outlet 5012b), the refrigerant inlet pipe 204, the second refrigerant inlet 2101, the second refrigerant outlet 2102, the fifth refrigerant port 2111, the sixth refrigerant port 2112, the second refrigerant pipe 202, the liquid pipe 40, the second refrigerant port 102, the first refrigerant port 101, the gas pipe 30, and the first refrigerant pipe 201. At the same time, part of the heat of the refrigerant is exchanged in the domestic hot water heat exchanger 501a (or phase change heat exchanger 501b).

[0092] When the heat pump system is also equipped with a hydraulic module 60, in the cooling and waste heat recovery domestic hot water production mode, the refrigerant also returns from the liquid pipe 40 to the gas pipe 30 via the fourth refrigerant port 6012 and the third refrigerant port 6011. The refrigerant exchanges heat with the water in the external terminal 80 on the heat exchanger 601, for example, to achieve a floor cooling effect. In the cooling and waste heat recovery domestic hot water production mode, the indoor unit 10 and the hydraulic module 60 can operate selectively or simultaneously.

[0093] In some embodiments, when the heat pump system is equipped with a domestic hot water module 50, in the heating and domestic hot water mode, after the refrigerant comes out of the compressor 209, it forms a heating refrigerant circuit through the refrigerant outlet pipe 203, the first refrigerant inlet 5011a (or heat exchange refrigerant inlet 5011b), the first refrigerant outlet 5012a (or heat exchange refrigerant outlet 5012b), the refrigerant inlet pipe 204, the second refrigerant inlet 2101, the second refrigerant outlet 2102, the first refrigerant pipe 201, the gas pipe 30, the first refrigerant port 101, the second refrigerant port 102, the liquid pipe 40, the second refrigerant pipe 202, the sixth refrigerant port 2112, and the fifth refrigerant port 2111. At the same time, part of the heat of the refrigerant is exchanged in the domestic hot water heat exchanger 501a (or the phase change heat exchanger 501b).

[0094] When the heat pump system is also equipped with a hydraulic module 60, in the heating and domestic hot water mode, the refrigerant exits from the gas pipe 30 and returns to the liquid pipe 40 via the third refrigerant port 6011 and the fourth refrigerant port 6012. The refrigerant exchanges heat with the water in the external terminal 80 on the heat exchanger 601, for example, to achieve the effect of underfloor heating. It should be noted that in the heating and domestic hot water mode, the indoor unit 10 and the hydraulic module 60 can operate selectively or simultaneously.

[0095] In some embodiments, when the heat pump system is equipped with a domestic hot water module 50, in pure hot water mode, after the refrigerant comes out of the compressor 209, it forms a pure hot water refrigerant circuit through the refrigerant outlet pipe 203, the first refrigerant inlet 5011a (or heat exchange refrigerant inlet 5011b), the first refrigerant outlet 5012a (or heat exchange refrigerant outlet 5012b), the refrigerant inlet pipe 204, the second refrigerant inlet 2101, the third refrigerant outlet 2103, the first throttling device 212, the sixth refrigerant port 2112 and the fifth refrigerant port 2111. At the same time, all the heat of the refrigerant is exchanged in the domestic hot water heat exchanger 501a (or phase change heat exchanger 501b).

[0096] In some embodiments, when the heat pump system is equipped with a hydraulic module 60, in cooling mode, the refrigerant exits from the compressor 209 and forms a refrigerant circuit via the fifth refrigerant port 2111, the sixth refrigerant port 2112, the second refrigerant line 202, the liquid line 40, the second refrigerant port 102, the first refrigerant port 101, the gas line 30, and the first refrigerant line 201. Furthermore, the refrigerant also exits from the liquid line 40 and returns to the gas line 30 via the fourth refrigerant port 6012 and the third refrigerant port 6011. The refrigerant exchanges heat with the water in the external terminal 80 at the heat exchanger 601, for example, achieving a floor cooling effect. In cooling mode, the indoor unit 10 and the hydraulic module 60 can operate selectively or simultaneously.

[0097] In some embodiments, when the heat pump system is equipped with a hydraulic module 60, in heating mode, the refrigerant exits from the compressor 209 and forms a heating refrigerant circuit via the first refrigerant line 201, gas line 30, first refrigerant port 101, second refrigerant port 102, liquid line 40, second refrigerant line 202, sixth refrigerant port 2112, and fifth refrigerant port 2111. Furthermore, the refrigerant also exits from the gas line 30 and returns to the liquid line 40 via the third refrigerant port 6011 and fourth refrigerant port 6012. The refrigerant exchanges heat with water in the external terminal 80 at the heat exchanger 601, for example, to achieve a floor heating effect. It should be noted that in heating mode, the indoor unit 10 and the hydraulic module 60 can operate selectively or simultaneously.

[0098] It should be noted that "all heat is exchanged in the domestic hot water heat exchanger 501a (or phase change heat exchanger 501b)" means that the refrigerant is completely formed into liquid refrigerant after heat exchange in the domestic hot water heat exchanger 501a (or phase change heat exchanger 501b). "Partial heat is exchanged in the domestic hot water heat exchanger 501a (or phase change heat exchanger 501b)" means that the refrigerant is formed into gaseous refrigerant after heat exchange in the domestic hot water heat exchanger 501a (or phase change heat exchanger 501b).

[0099] In some embodiments, as shown in Figures 1 and 2, the outdoor unit 20 further includes a fifth switching valve 213 and a first reversing valve 214. The fifth switching valve 213 is used to regulate the amount of refrigerant flowing to the refrigerant outlet pipe 203, and the first reversing valve 214 is used to switch all or part of the heat of the refrigerant to be exchanged in the domestic hot water module 50 when the external domestic hot water module 50 is connected.

[0100] The outlet of compressor 209 is connected to refrigerant outlet line 203 via fifth switching valve 213, and the outlet of compressor 209 is connected to first refrigerant line 201 and fifth refrigerant port 2111 via first reversing valve 214. Second refrigerant outlet 2102 is connected to first refrigerant line 201 and fifth refrigerant port 2111 via first reversing valve 214.

[0101] The first reversing valve 214 includes a first valve port 2141, a second valve port 2142, and a third valve port 2143. Specifically, the first valve port 2141 is connected to the second refrigerant outlet 2102, the second valve port 2142 is connected to the first refrigerant pipeline 201 and the fifth refrigerant port 2111, and the third valve port 2143 is connected to the outlet of the compressor 209.

[0102] When the fifth switch valve 213 is opened, the outlet of the compressor 209 is connected to the refrigerant outlet pipeline 203.

[0103] When the first valve port 2141 is connected to the second valve port 2142, the second refrigerant outlet 2102 is connected to the first refrigerant pipeline 201 or the fifth refrigerant port 2111.

[0104] When the third valve port 2143 is connected to the second valve port 2142, the outlet of the compressor 209 is connected to the first refrigerant line 201 or the fifth refrigerant port 2111.

[0105] In other embodiments, as shown in FIG3, the outdoor unit 20 further includes a fifth switching valve 213 and a first reversing valve 214. The fifth switching valve 213 is used to switch all or part of the heat of the refrigerant to be exchanged in the domestic hot water module 50 when the external domestic hot water module 50 is connected. The first reversing valve 214 is used to regulate the amount of refrigerant flowing to the refrigerant outlet pipe 203.

[0106] The outlet of compressor 209 is connected to refrigerant outlet line 203 via the first reversing valve 214, and the outlet of compressor 209 is also connected to the first refrigerant line 201 and the fifth refrigerant port 2111 via the first reversing valve 214. The second refrigerant outlet 2102 is connected to the first refrigerant line 201 and the fifth refrigerant port 2111 via the fifth switching valve 213.

[0107] The first reversing valve 214 includes a first valve port 2141, a second valve port 2142, and a third valve port 2143. Specifically, the first valve port 2141 is connected to the outlet of the compressor 209, the second valve port 2142 is connected to the refrigerant outlet pipeline 203, and the third valve port 2143 is connected to the first refrigerant pipeline 201 and the fifth refrigerant port 2111.

[0108] When the first valve port 2141 is connected to the second valve port 2142, the outlet of the compressor 209 is connected to the refrigerant outlet pipeline 203.

[0109] When the first valve port 2141 is connected to the third valve port 2143, the outlet of the compressor 209 is connected to the first refrigerant line 201 or the fifth refrigerant port 2111.

[0110] When the fifth switch valve 213 is opened, the second refrigerant outlet 2102 is connected to the first refrigerant pipeline 201 or the fifth refrigerant port 2111.

[0111] For example, the first directional valve 214 is a three-way valve and the fifth switching valve 213 is a two-way valve. The three-way valve and the two-way valve here are just examples and are not intended to limit this application. They can also be other types.

[0112] In some embodiments, as shown in FIG2, the outdoor unit 20 further includes an economy module, which is used to reduce the temperature of the refrigerant entering the outdoor heat exchanger 211, thereby improving the heat absorption performance of the outdoor heat exchanger 211 in a low-temperature environment and enhancing the subsequent heating effect.

[0113] The first end of the economic module is connected to the second refrigerant pipeline 202, the second end of the economic module is connected to the sixth refrigerant port 2112, and the third refrigerant outlet 2103 is connected to the second end of the economic module via the first throttling device 212.

[0114] In other embodiments, as shown in Figures 1 and 3, the outdoor unit 20 further includes an economy module and a liquid storage container 217. The first interface 2171 of the liquid storage container 217 is connected to the second refrigerant line 202, and the third refrigerant outlet 2103 is connected to the second refrigerant line 202 via a first throttling device 212. The second interface 2172 of the liquid storage container 217 is connected to the first end of the economy module, and the second end of the economy module is connected to the sixth refrigerant port 2112.

[0115] In some embodiments, the economy module includes an economizer 215 and a second throttling device 216. The economizer 215 includes a seventh refrigerant port 2151, an eighth refrigerant port 2152, a ninth refrigerant port 2153 connected to the seventh refrigerant port 2151, and a tenth refrigerant port 2154 connected to the eighth refrigerant port 2152. For example, the economizer 215 may be a heat exchanger, and the second throttling device 216 may be an electronic expansion valve or a thermostatic expansion valve. The electronic expansion valve and thermostatic expansion valve used here are merely examples and are not intended to limit the scope of this application.

[0116] The second end of the economic module is the ninth refrigerant port 2153. The first end of the economic module is divided into two paths: one path is connected to the sixth refrigerant port 2112 via the main refrigerant path (i.e., via the seventh refrigerant port 2151 and the ninth refrigerant port 2153 in sequence), and the other path is connected to the inlet of the compressor 209 via the auxiliary refrigerant path (via the second throttling device 216, the eighth refrigerant port 2152 and the tenth refrigerant port 2154 in sequence).

[0117] In this embodiment, an economy module is added to the outlet of the indoor unit 10, so that the refrigerant coming out of the indoor unit 10 passes through the main refrigerant path and the auxiliary refrigerant path respectively. After the refrigerant in the auxiliary refrigerant path is throttled and cooled by the second throttling device 216, it can absorb the heat of the refrigerant from the main refrigerant path more efficiently in the economizer 215, so that the temperature of the refrigerant entering the outdoor heat exchanger 211 is lower. Especially in cold winter, the temperature of the refrigerant can be lower than the outdoor temperature, thereby improving the heat absorption performance of the outdoor heat exchanger 211 in low-temperature environments and improving the subsequent heating effect.

[0118] In some embodiments, the outdoor unit 20 further includes a second reversing valve 218, which is used to switch between cooling and heating modes. The second refrigerant outlet 2102 is connected to the first refrigerant line 201 and the fifth refrigerant port 2111 via the second refrigerant valve 218 (specifically via the first refrigerant valve 214 and the second refrigerant valve 218). The fifth refrigerant port 2111 and the first refrigerant line 201 are connected to the inlet of the compressor 209 via the second reversing valve 218.

[0119] The second reversing valve 218 includes a fourth valve port 2181, a fifth valve port 2182, a sixth valve port 2183, and a seventh valve port 2184. The fourth valve port 2181 is connected to the outlet of the compressor 209 and the second refrigerant outlet 2102; the fifth valve port 2182 is connected to the fifth refrigerant port 2111; the sixth valve port 2183 is connected to the inlet of the compressor 209; and the seventh valve port 2184 is connected to the first refrigerant line 201. For example, the second reversing valve 218 may be a four-way valve. This four-way valve is merely an example and is not intended to limit the scope of this application; other valves may also be used.

[0120] When the fourth valve port 2181 is connected to the fifth valve port 2182, the fifth refrigerant port 2111 is connected to the outlet of the compressor 209 and / or the second refrigerant outlet 2102.

[0121] When the fourth valve port 2181 is connected to the seventh valve port 2184, the first refrigerant line 201 is connected to the outlet of the compressor 209 and / or the second refrigerant outlet 2102.

[0122] When the fifth valve port 2182 is connected to the sixth valve port 2183, the fifth refrigerant port 2111 is connected to the inlet of the compressor 209.

[0123] When the seventh valve port 2184 is connected to the sixth valve port 2183, the first refrigerant line 201 is connected to the inlet of the compressor 209.

[0124] In some embodiments, the outdoor unit 20 further includes a third throttling device 219, through which the second end of the economy module (specifically the ninth refrigerant port 2153) is connected to the sixth refrigerant port 2112. For example, the third throttling device 219 is an electronic expansion valve or a thermostatic expansion valve. The electronic expansion valve and thermostatic expansion valve mentioned here are merely examples and are not intended to limit the scope of this application.

[0125] In this embodiment, the temperature of the refrigerant entering the outdoor heat exchanger 211 can be further reduced by the third throttling device 219.

[0126] Furthermore, the heat pump system also includes a one-way valve 220. The sixth refrigerant port 2112 is also connected to the second end of the economy module (specifically the ninth refrigerant port 2153) through the one-way valve 220. The flow direction of the one-way valve 220 is towards the second end of the economy module. It should be noted that the orientation of the one-way valve 220 refers to the direction of refrigerant flow, not the orientation of its spatial position.

[0127] In some embodiments, the outdoor unit 20 further includes a low-pressure gas-liquid separator 221, which is used to separate gaseous refrigerant and liquid refrigerant. The low-pressure gas-liquid separator 221 is located at the inlet end of the compressor 209, and the tenth refrigerant port 2154 is connected to the low-pressure gas-liquid separator 221.

[0128] In some embodiments, as shown in Figures 1, 2 and 3, the outdoor unit 20 further includes a heat recovery branch 224, one end of which is connected to the third refrigerant outlet 2103, and the other end of which is connected to the low-pressure gas-liquid separator 221. The outlet of the low-pressure gas-liquid separator 221 is connected to the inlet of the compressor 209.

[0129] In this embodiment, a heat recovery branch 224 is provided between the third refrigerant outlet 2103 of the high-pressure gas-liquid separator 210 and the inlet of the low-pressure gas-liquid separator 221. The heat recovery branch 224 can realize the return of oil accumulated in the high-pressure gas-liquid separator 210 on the one hand, and release the refrigerant that has migrated into the high-pressure gas-liquid separator 210 to relieve pressure, thereby improving the pressure balance of the system.

[0130] In some embodiments, as shown in Figures 1, 2, and 3, the outdoor unit 20 further includes a branch valve 225, which is located on the heat recovery branch 224. Depending on the system operation, the branch valve 225 is opened to return oil or adjust the system pressure balance. For example, the branch valve 225 is a solenoid valve; however, this is merely an example and not intended to limit the scope of this application, and other types of valves may also be used.

[0131] It should be noted that branch valve 225 is not only open when the refrigerant is in a gaseous state, but can also be opened when the refrigerant is not in a gaseous state. That is, branch valve 225 can be opened according to the system conditions, such as refrigerant migration, system pressure, and the oil return requirements of compressor 209.

[0132] In some embodiments, as shown in Figures 1, 2, and 3, at least a portion of the heat recovery branch 224 is a capillary tube. Due to the high resistance of the capillary tube, it can be used to control the amount of refrigerant entering the low-pressure gas-liquid separator 221, preventing excessive refrigerant leakage into the low-pressure gas-liquid separator 221 after the branch valve 225 is opened. And / or, in other embodiments, at least a portion of the pipeline of the third refrigerant outlet 2103 is a capillary tube. It is understood that "at least a portion" can be partial or complete.

[0133] In some embodiments, the outdoor unit 20 also includes an oil separator 222 and an oil return pipe 223. The oil separator 222 is located at the outlet end of the compressor 209. The oil separator 222 is used to separate the lubricating oil from the compressor 209 mixed in the refrigerant and return it to the compressor 209 through the oil return pipe 223.

[0134] In some embodiments, the heat pump system further includes a fourth throttling device 70 corresponding to each indoor unit 10, and the second refrigerant port 102 is connected to the corresponding branch end in the liquid pipe 40 via the fourth throttling device 70. For example, the fourth throttling device 70 is an electronic expansion valve or a thermostatic expansion valve. The electronic expansion valve and thermostatic expansion valve mentioned here are merely examples and are not intended to limit the scope of this application.

[0135] In some embodiments, the indoor unit 10 is a ducted unit or a ceiling unit, which includes an indoor heat exchanger (such as a finned heat exchanger) and a fan.

[0136] In some embodiments, the heat pump system also includes a fresh air module for each indoor unit 10, used to introduce fresh outdoor air and exhaust stale indoor air.

[0137] Completely, in some embodiments, as shown in Figures 1 and 4, the connection relationships between the components in the outdoor unit 20 are as follows:

[0138] One outlet of compressor 209 is connected to refrigerant outlet pipe 203 via fifth switching valve 213. A third switching valve 207 is installed on refrigerant outlet pipe 203. Another outlet of compressor 209 is connected to the third valve port 2143 of first reversing valve 214. Refrigerant inlet pipe 204 is connected to the second refrigerant inlet 2101 of high-pressure gas-liquid separator 210. A fourth switching valve 208 is installed on refrigerant inlet pipe 204. The second refrigerant outlet 2102 of high-pressure gas-liquid separator 210 is connected to the first valve port 2141 of first reversing valve 214. A second switching valve 206 is installed on second refrigerant pipe 202, and the first interface 2171 of liquid storage container 217 is connected to second refrigerant pipe 202. One path of the third refrigerant outlet 2103 of the high-pressure gas-liquid separator 210 is connected via the first throttling device 212 between the second switching valve 206 and the first interface 2171 of the liquid storage container 217. Another path of the third refrigerant outlet 2103 of the high-pressure gas-liquid separator 210 is connected via the heat recovery branch 224 to the inlet of the low-pressure gas-liquid separator 221. The outlet of the low-pressure gas-liquid separator 221 is connected to the inlet of the compressor 209. The second valve port 2142 of the first reversing valve 214 is connected to the fourth valve port 2181 of the second reversing valve 218. The fifth valve port 2182 of the second reversing valve 218 is connected to the fifth refrigerant port 2111 of the outdoor heat exchanger 211. The sixth valve port 2183 of the second reversing valve 218 is connected via the low-pressure gas-liquid separator 221 to the inlet of the compressor 209. The seventh port 2184 of the second reversing valve 218 is connected to the first refrigerant line 201, and the first refrigerant line 201 is equipped with a first switching valve 205. One of the second interfaces 2172 of the liquid storage container 217 is connected to the seventh refrigerant port 2151 of the economizer 215, and the other interface 2172 of the liquid storage container 217 is connected to the eighth refrigerant port 2152 of the economizer 215 via the second throttling device 216. One of the ninth refrigerant ports 2153 of the economizer 215 is connected to the sixth refrigerant port 2112 of the outdoor heat exchanger 211 via the third throttling device 219, and the other interface 2153 of the ninth refrigerant port 2153 of the economizer 215 is connected to the sixth refrigerant port 2112 of the outdoor heat exchanger 211 via the one-way valve 220, with the one-way valve 220 directed towards the ninth refrigerant port 2153 of the economizer 215. The tenth refrigerant port 2154 of the economizer 215 is connected to the inlet of the compressor 209 via the low-pressure gas-liquid separator 221.

[0139] Completely, in some embodiments, as shown in Figure 2, the connection relationships between the components in the outdoor unit 20 are as follows:

[0140] One outlet of compressor 209 is connected to refrigerant outlet pipe 203 via fifth switching valve 213. A third switching valve 207 is installed on refrigerant outlet pipe 203. Another outlet of compressor 209 is connected to the third valve port 2143 of first reversing valve 214. Refrigerant inlet pipe 204 is connected to the second refrigerant inlet 2101 of high-pressure gas-liquid separator 210. A fourth switching valve 208 is installed on refrigerant inlet pipe 204. The second refrigerant outlet 2102 of high-pressure gas-liquid separator 210 is connected to the first valve port 2141 of first reversing valve 214. The second valve port 2142 of first reversing valve 214 is connected to the fourth valve port 2181 of second reversing valve 218. The fifth valve port 2182 of second reversing valve 218 is connected to the fifth refrigerant port 2111 of outdoor heat exchanger 211. The sixth port 2183 of the second reversing valve 218 is connected to the inlet of the compressor 209 via the low-pressure gas-liquid separator 221. The seventh port 2184 of the second reversing valve 218 is connected to the first refrigerant line 201, which is equipped with a first switching valve 205. The second refrigerant line 202 is equipped with a second switching valve 206. One branch of the second refrigerant line 202 is connected to the seventh refrigerant port 2151 of the economizer 215. The other branch of the second refrigerant line 202 is connected to the eighth refrigerant port 2152 of the economizer 215 via the second throttling device 216. The ninth refrigerant port 2153 of the economizer 215 is connected to the sixth refrigerant port 2112 of the outdoor heat exchanger 211 via the third throttling device 219. The ninth refrigerant port 2153 of the economizer 215 is connected to the sixth refrigerant port 2112 of the outdoor heat exchanger 211 via a one-way valve 220, with the one-way valve 220 oriented towards the ninth refrigerant port 2153 of the economizer 215. The ninth refrigerant port 2153 of the economizer 215 is also connected to the third refrigerant outlet 2103 via a first throttling device 212. The third refrigerant outlet 2103 is connected to the inlet of the low-pressure gas-liquid separator 221 via a heat recovery branch 224, and the outlet of the low-pressure gas-liquid separator 221 is connected to the inlet of the compressor 209. The tenth refrigerant port 2154 of the economizer 215 is connected to the inlet of the compressor 209 via the low-pressure gas-liquid separator 221. The difference between Figure 2 and Figure 1 is that Figure 1 includes an additional liquid storage container 217.

[0141] Completely, in some embodiments, as shown in Figure 3, the connection relationships between the components in the outdoor unit 20 are as follows:

[0142] The outlet of compressor 209 is connected to the first port 2141 of the first reversing valve 214. The second port 2142 of the first reversing valve 214 is connected to the refrigerant outlet pipeline 203. The third port 2143 of the first reversing valve 214 is connected to the fourth port 2181 of the second reversing valve 218. The refrigerant inlet pipeline 204 is connected to the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210. A fourth switching valve 208 is provided on the refrigerant inlet pipeline 204. The second refrigerant outlet 2102 of the high-pressure gas-liquid separator 210 is connected to the fourth port 2181 of the second reversing valve 218 via a fifth switching valve 213. A second switching valve 206 is provided on the second refrigerant pipeline 202. The first port 2171 of the liquid storage container 217 is connected to the second refrigerant pipeline 202. One path of the third refrigerant outlet 2103 of the high-pressure gas-liquid separator 210 is connected via the first throttling device 212 between the second switching valve 206 and the first interface 2171 of the liquid storage container 217. Another path of the third refrigerant outlet 2103 of the high-pressure gas-liquid separator 210 is connected via the heat recovery branch 224 to the inlet of the low-pressure gas-liquid separator 221. The outlet of the low-pressure gas-liquid separator 221 is connected to the inlet of the compressor 209. The second valve port 2142 of the first reversing valve 214 is connected to the fourth valve port 2181 of the second reversing valve 218. The fifth valve port 2182 of the second reversing valve 218 is connected to the fifth refrigerant port 2111 of the outdoor heat exchanger 211. The sixth valve port 2183 of the second reversing valve 218 is connected via the low-pressure gas-liquid separator 221 to the inlet of the compressor 209. The seventh port 2184 of the second reversing valve 218 is connected to the first refrigerant line 201, and the first refrigerant line 201 is equipped with a first switching valve 205. One of the second interfaces 2172 of the liquid storage container 217 is connected to the seventh refrigerant port 2151 of the economizer 215, and the other interface 2172 of the liquid storage container 217 is connected to the eighth refrigerant port 2152 of the economizer 215 via the second throttling device 216. One of the ninth refrigerant ports 2153 of the economizer 215 is connected to the sixth refrigerant port 2112 of the outdoor heat exchanger 211 via the third throttling device 219, and the other interface 2153 of the ninth refrigerant port 2153 of the economizer 215 is connected to the sixth refrigerant port 2112 of the outdoor heat exchanger 211 via the one-way valve 220, with the one-way valve 220 directed towards the ninth refrigerant port 2153 of the economizer 215. The tenth refrigerant port 2154 of the economizer 215 is connected to the inlet of the compressor 209 via the low-pressure gas-liquid separator 221. The difference between Figure 3 and Figure 1 is that the positions of the first reversing valve 214 and the fifth switching valve 213 are interchanged.

[0143] In addition, based on the outdoor unit 20 shown in Figures 1, 2, and 3, the first outlet 5022 of the first domestic water tank 502 is connected to the first water inlet 5013a of the domestic hot water heat exchanger 501a via the first water pump 503, and the first water outlet 5014a of the domestic hot water heat exchanger 501a is connected to the first return outlet 5023 of the first domestic water tank 502. The first refrigerant inlet 5011a of the domestic hot water heat exchanger 501a is connected to the refrigerant outlet pipe 203, and the first refrigerant outlet 5012a of the domestic hot water heat exchanger 501a is connected to the refrigerant inlet pipe 204.

[0144] Based on the outdoor unit 20 shown in Figure 4, the heat exchange refrigerant inlet 5011b of the phase change heat exchanger 501b is connected to the refrigerant outlet pipe 203, and the heat exchange refrigerant outlet 5012b of the phase change heat exchanger 501b is connected to the refrigerant inlet pipe 204.

[0145] Based on the outdoor unit 20 shown in Figures 1, 2, 3 and 4, the first refrigerant port 101 of the indoor unit 10 is connected to the corresponding branch end in the gas pipe 30, and the second refrigerant port 102 of the indoor unit 10 is connected to the corresponding branch end in the liquid pipe 40 via the fourth throttling device 70.

[0146] Based on the outdoor unit 20 shown in Figures 1, 2, 3, and 4, the third refrigerant port 6011 of the heat exchanger 601 is connected to the corresponding branch port in the gas pipe 30, and the fourth refrigerant port 6012 of the heat exchanger 601 is connected to the corresponding branch port in the liquid pipe 40 via the fifth throttling device 604. The second water outlet 801 of the terminal 80 is connected to the second water inlet 6013 of the heat exchanger 601 via the second water pump 603, and the second water outlet 6014 of the heat exchanger 601 is connected to the second return water port 802 of the terminal 80.

[0147] Second embodiment:

[0148] As shown in Figures 1 and 2, this application discloses a heat pump system, including a compressor 209, a domestic hot water heat exchanger 501a, a high-pressure gas-liquid separator 210, an outdoor heat exchanger 211, at least one indoor unit 10, a first reversing valve 214, a second reversing valve 218, and a fifth switching valve 213. It is understood that the "at least one" unit can be one, two, three, or any number of units. The specific details of this heat pump system are as follows:

[0149] Compressor 209 is used to compress refrigerant. Domestic hot water heat exchanger 501a is used to achieve heat exchange between the refrigerant and water. Domestic hot water heat exchanger 501a includes a first refrigerant inlet 5011a and a first refrigerant outlet 5012a connected to the first refrigerant inlet 5011a. High-pressure gas-liquid separator 210 includes a second refrigerant inlet 2101, a second refrigerant outlet 2102 connected to the second refrigerant inlet 2101, and a third refrigerant outlet 2103 connected to the second refrigerant inlet 2101. The second refrigerant outlet 2102 is used to output gaseous refrigerant after gas-liquid separation, and the third refrigerant outlet 2103 is used to output liquid refrigerant after gas-liquid separation.

[0150] The compressor 209 outlet is connected to the first refrigerant inlet 5011a via the fifth switching valve 213, the first refrigerant outlet 5012a is connected to the second refrigerant inlet 2101, the second refrigerant outlet 2102 is connected to the second refrigerant valve 218 via the first reversing valve 214, the second reversing valve 218 is connected to the outdoor heat exchanger 211, the indoor unit 10 and the compressor 209 inlet, the third refrigerant outlet 2103 is connected to the indoor unit 10, and the outdoor heat exchanger 211 is connected to the indoor unit 10.

[0151] When cooling and domestic hot water production are running simultaneously, the first reversing valve 214 keeps the second refrigerant outlet 2102 connected to the second reversing valve 218, and all the heat of the refrigerant is exchanged in the domestic hot water heat exchanger 501a, i.e., in the cooling and total heat recovery domestic hot water production mode, the refrigerant forms a first flow path from the outlet of the compressor 209 through the fifth switching valve 213, the first refrigerant inlet 5011a, the first refrigerant outlet 5012a, the second refrigerant inlet 2101, the third refrigerant outlet 2103, the indoor unit 10, the second reversing valve 218, and the inlet of the compressor 209.

[0152] When cooling and domestic hot water production are operating simultaneously, the first reversing valve 214 keeps the second refrigerant outlet 2102 connected to the second reversing valve 218, and part of the heat of the refrigerant is exchanged in the domestic hot water heat exchanger 501a, i.e., in the cooling and partial heat recovery domestic hot water production mode, the refrigerant forms a second flow path from the outlet of the compressor 209 through the fifth switching valve 213, the first refrigerant inlet 5011a, the first refrigerant outlet 5012a, the second refrigerant inlet 2101, the second refrigerant outlet 2102, the first reversing valve 214, the second reversing valve 218, the outdoor heat exchanger 211, the indoor unit 10, the second reversing valve 218, and the inlet of the compressor 209.

[0153] In this embodiment, in both the cooling and total heat recovery domestic hot water production mode and the cooling and partial heat recovery domestic hot water production mode, the first reversing valve 214 keeps the second refrigerant outlet 2102 of the high-pressure gas-liquid separator 210 connected to the second reversing valve 218. Therefore, when switching between the two modes, it is not necessary to activate the first reversing valve 214, but only the second reversing valve 218 needs to be activated. The gas-liquid separation of the high-pressure gas-liquid separator 210 can realize the automatic flow direction of refrigerant when switching between modes, thereby improving the stability of the system.

[0154] In some embodiments, the third refrigerant outlet 2103 is also connected to the outdoor heat exchanger 211.

[0155] When heating and domestic hot water production are running simultaneously, the first reversing valve 214 keeps the second refrigerant outlet 2102 connected to the second reversing valve 218, and some of the heat of the refrigerant is exchanged in the domestic hot water heat exchanger 501a, i.e., in the heating plus domestic hot water mode, the refrigerant forms a third flow path from the outlet of the compressor 209 through the fifth switching valve 213, the first refrigerant inlet 5011a, the first refrigerant outlet 5012a, the second refrigerant inlet 2101, the second refrigerant outlet 2102, the first reversing valve 214, the second reversing valve 218, the indoor unit 10, the outdoor heat exchanger 211, the second reversing valve 218, and the inlet of the compressor 209.

[0156] When the domestic hot water system operates independently, and the first reversing valve 214 keeps the second refrigerant outlet 2102 connected to the second reversing valve 218, and all the heat of the refrigerant is exchanged in the domestic hot water heat exchanger 501a, i.e., in pure hot water mode, the refrigerant forms a fourth flow path from the outlet of the compressor 209 through the fifth switching valve 213, the first refrigerant inlet 5011a, the first refrigerant outlet 5012a, the second refrigerant inlet 2101, the third refrigerant outlet 2103, the outdoor heat exchanger 211, the second reversing valve 218, and the inlet of the compressor 209.

[0157] In this embodiment, in both the heating and domestic hot water production modes and the pure hot water production mode, the first reversing valve 214 keeps the second refrigerant outlet 2102 of the high-pressure gas-liquid separator 210 connected to the second reversing valve 218. Therefore, when switching between the two modes, it is not necessary to activate the first reversing valve 214; only the second reversing valve 218 needs to be activated. The gas-liquid separation of the high-pressure gas-liquid separator 210 can realize the automatic flow of refrigerant when switching between modes, thereby improving the stability of the system.

[0158] For example, the domestic hot water heat exchanger 501a is a shell-and-tube heat exchanger, the outdoor heat exchanger 211 is a finned heat exchanger, the indoor unit 10 is a ducted air conditioner, which includes an indoor heat exchanger (such as a finned heat exchanger) and a fan, and the fifth switch valve 213 is a two-way valve. The shell-and-tube heat exchanger, finned heat exchanger, ducted air conditioner and two-way valve mentioned here are just examples and are not intended to limit this application. They could be other types as well.

[0159] It should be noted that "all heat is exchanged in the domestic hot water heat exchanger 501a" means that the refrigerant is completely converted into liquid refrigerant after heat exchange in the domestic hot water heat exchanger 501a, while "partial heat is exchanged in the domestic hot water heat exchanger 501a" means that the refrigerant is converted into gaseous refrigerant after heat exchange in the domestic hot water heat exchanger 501a.

[0160] In some embodiments, as shown in Figures 1 and 2, the outdoor heat exchanger 211 is used to realize heat exchange between the refrigerant and the outside air. The outdoor heat exchanger 211 includes a fifth refrigerant port 2111 and a sixth refrigerant port 2112 connected to the fifth refrigerant port 2111. The indoor unit 10 is used to realize heat exchange between the refrigerant and the indoor air. The indoor unit 10 includes a first refrigerant port 101 and a second refrigerant port 102 connected to the first refrigerant port 101.

[0161] The compressor 209 outlet is connected to the first refrigerant inlet 5011a via the fifth switching valve 213, and the compressor 209 outlet is connected to the second refrigerant inlet 218 via the first reversing valve 214. The second reversing valve 218 is connected to the fifth refrigerant port 2111, the first refrigerant port 101, and the compressor 209 inlet. The first refrigerant outlet 5012a is connected to the second refrigerant inlet 2101. The second refrigerant outlet 2102 is connected to the second refrigerant inlet 218 via the first reversing valve 214. The third refrigerant outlet 2103 is connected to the sixth refrigerant port 2112 and the second refrigerant port 102, and the sixth refrigerant port 2112 is connected to the second refrigerant port 102.

[0162] In some embodiments, as shown in Figures 1 and 2, the first reversing valve 214 includes a first valve port 2141, a second valve port 2142, and a third valve port 2143. The first valve port 2141 is connected to the second refrigerant outlet 2102, the second valve port 2142 is connected to the second reversing valve 218, and the third valve port 2143 is connected to the outlet of the compressor 209.

[0163] When cooling and domestic hot water production are running simultaneously, heating and domestic hot water production are running simultaneously, and domestic hot water production is running alone, the first valve port 2141 is connected to the second valve port 2142, that is, the second refrigerant outlet 2102 is connected to the second reversing valve 218.

[0164] When the third valve port 2143 is connected to the second valve port 2142, the outlet of the compressor 209 is connected to the second reversing valve 218.

[0165] For example, the first directional valve 214 is a three-way valve. The three-way valve here is just an example and is not intended to limit this application. It can also be other valves.

[0166] In some embodiments, as shown in Figures 1 and 2, the second reversing valve 218 includes a fourth valve port 2181, a fifth valve port 2182, a sixth valve port 2183, and a seventh valve port 2184. The fourth valve port 2181 is connected to the first reversing valve 214 (specifically, the second valve port 2142 of the first reversing valve 214), the fifth valve port 2182 is connected to the outdoor heat exchanger 211 (specifically, the fifth refrigerant port 2111 of the outdoor heat exchanger 211), the sixth valve port 2183 is connected to the inlet of the compressor 209, and the seventh valve port 2184 is connected to the indoor unit 10 (specifically, the first refrigerant port 101 of the indoor unit 10).

[0167] When the fourth valve port 2181 is connected to the fifth valve port 2182, the first reversing valve 214 is connected to the outdoor heat exchanger 211. Specifically, the second valve port 2142 of the first reversing valve 214 is connected to the fifth refrigerant port 2111 of the outdoor heat exchanger 211.

[0168] When the fourth valve port 2181 is connected to the seventh valve port 2184, the first reversing valve 214 is connected to the indoor unit 10. Specifically, the second valve port 2142 of the first reversing valve 214 is connected to the first refrigerant port 101 of the indoor unit 10.

[0169] When the fifth valve port 2182 is connected to the sixth valve port 2183, the outdoor heat exchanger 211 (specifically the fifth refrigerant port 2111 of the outdoor heat exchanger 211) is connected to the inlet of the compressor 209.

[0170] When the seventh valve port 2184 is connected to the sixth valve port 2183, the indoor unit 10 (specifically the first refrigerant port 101 of the indoor unit 10) is connected to the inlet of the compressor 209.

[0171] In some embodiments, as shown in FIG1, the heat pump system further includes a first throttling device 212, which is used to throttle and cool the refrigerant. Specifically, the third refrigerant outlet 2103 is connected to the outdoor heat exchanger 211 and the indoor unit 10 via the first throttling device 212. Specifically, the third refrigerant outlet 2103 is connected to the sixth refrigerant port 2112 of the outdoor heat exchanger 211 and the second refrigerant port 102 of the indoor unit 10 via the first throttling device 212. For example, the first throttling device 212 can be an electronic expansion valve or a thermostatic expansion valve. These examples are merely illustrative and not intended to limit the scope of this application; other types are also possible.

[0172] In some embodiments, as shown in Figures 1 and 2, the domestic hot water heat exchanger 501a further includes a first water inlet 5013a and a first water outlet 5014a connected to the first water inlet 5013a. The heat pump system also includes a first domestic water tank 502, which is used to store domestic water and is connected to the first water inlet 5013a and the first water outlet 5014a of the domestic hot water heat exchanger 501a.

[0173] In other embodiments, the first domestic water tank 502 can be replaced with a hot water usage device (not shown) or a hot water storage tank (not shown). For details, please refer to the first embodiment described above, which will not be repeated here.

[0174] In some embodiments, as shown in Figures 1 and 2, the first domestic water tank 502 includes a first cold water inlet 5021, a first water outlet 5022, a first return water outlet 5023, and a first hot water outlet 5024. The first water outlet 5022 is connected to the first water inlet 5013a, and the first water outlet 5014a is connected to the first return water outlet 5023.

[0175] In some embodiments, as shown in Figures 1 and 2, the heat pump system further includes a first water pump 503, which is disposed in the inlet pipe (i.e., the pipe connecting the first outlet 5022 and the first water inlet 5013a) or the outlet pipe (i.e., the pipe connecting the first water outlet 5014a and the first return water inlet 5023) of the domestic hot water heat exchanger 501a. The first water pump 503 is used to provide power for the water circulation between the domestic hot water heat exchanger 501a and the first domestic water tank 502.

[0176] In some embodiments, the domestic hot water heat exchanger 501a, the first domestic water tank 502 and the first water pump 503 can be integrated into a domestic hot water module, which can be installed by the user on the pipeline at the fifth switch valve 213 and the second refrigerant inlet 2101 according to actual needs.

[0177] In some embodiments, as shown in Figures 1 and 2, the heat pump system further includes a gas pipe 30, a liquid pipe 40, and at least two indoor units 10. In each indoor unit 10, a first refrigerant port 101 is connected to a corresponding branch port in the gas pipe 30, and a second refrigerant port 102 is connected to a corresponding branch port in the liquid pipe 40. The main interface of the liquid pipe 40 is connected to a third refrigerant outlet 2103 and a sixth refrigerant port 2112, specifically, the main interface of the liquid pipe 40 is connected to the third refrigerant outlet 2103 via a first throttling device 212. The main interface of the gas pipe 30 is connected to a second reversing valve 218 (specifically, the seventh valve port 2184 of the second reversing valve 218).

[0178] In some embodiments, as shown in Figures 1 and 2, the heat pump system further includes a first switching valve 205, a second switching valve 206, a third switching valve 207, and a fourth switching valve 208. The third switching valve 207 is located on the pipeline between the fifth switching valve 213 and the first refrigerant inlet 5011a. The fourth switching valve 208 is located on the pipeline between the first refrigerant outlet 5012a and the second refrigerant inlet 2101. One end of the second switching valve 206 is connected to the third refrigerant outlet 2103 and the sixth refrigerant port 2112, and the other end is connected to the main interface of the liquid pipe 40. The first switching valve 205 is located on the pipeline between the main interface of the gas pipe 30 and the second reversing valve 218 (specifically, the seventh valve port 2184 of the second reversing valve 218).

[0179] In some embodiments, as shown in Figures 1 and 2, the heat pump system further includes a fourth throttling device 70 corresponding to each indoor unit 10. The fourth throttling device 70 is used to throttle and cool the refrigerant. The fourth throttling device 70 is located on the pipeline at the second refrigerant port 102, that is, the second refrigerant port 102 is connected to the corresponding branch end in the liquid pipe 40 via the fourth throttling device 70. For example, the fourth throttling device 70 is an electronic expansion valve or a thermostatic expansion valve. These examples are merely illustrative and not intended to limit the scope of this application; other types are also possible.

[0180] In some embodiments, the heat pump system also includes a fresh air module, as detailed in the first embodiment, which will not be repeated here.

[0181] In some embodiments, as shown in Figures 1 and 2, the heat pump system further includes at least one heat exchanger 601, which is used to realize heat exchange between the refrigerant and the water in the terminal 80. The heat exchanger 601 includes a third refrigerant port 6011 and a fourth refrigerant port 6012 connected to the third refrigerant port 6011. The third refrigerant port 6011 is connected to the corresponding branch end in the gas pipe 30, and the fourth refrigerant port 6012 is connected to the corresponding branch end in the liquid pipe 40.

[0182] In some embodiments, as shown in Figures 1 and 2, the heat pump system further includes a fifth throttling device 604, which is used to throttle and cool the refrigerant. The fourth refrigerant port 6012 is connected to the corresponding branch port in the liquid pipe 40 via the fifth throttling device 604. For example, the fifth throttling device 604 can be an electronic expansion valve or a thermostatic expansion valve. These examples are merely illustrative and not intended to limit the scope of this application; other types are also possible.

[0183] In some embodiments, as shown in Figures 1 and 2, the heat exchanger 601 further includes a second water inlet 6013 and a second water outlet 6014 connected to the second water inlet 6013. The heat pump system also includes a terminal 80, which includes a second water outlet 801 and a second water return outlet 802. The second water outlet 801 is connected to the second water inlet 6013, and the second water outlet 6014 is connected to the second water return outlet 802. For example, the terminal 80 may be a ground pipe, which achieves underfloor heating or underfloor cooling effects through heat exchange with the heat exchanger 601. The ground pipe mentioned here is merely an example and is not intended to limit this application; other types are also possible.

[0184] In some embodiments, as shown in Figures 1 and 2, the heat pump system further includes a second water pump 603, which is disposed in the inlet pipe (i.e., the pipe connecting the second outlet 801 and the second water inlet 6013) or the outlet pipe (i.e., the pipe connecting the second water outlet 6014 and the second return water inlet 802) of the terminal 80. The second water pump 603 is used to provide power for the water circulation between the heat exchanger 601 and the terminal 80.

[0185] In some embodiments, the heat exchanger 601, the fifth throttling device 604, and the second water pump 603 can be integrated into a hydraulic module, which can be mounted on the gas pipe 30 and the liquid pipe 40 as needed. Furthermore, the indoor unit 10 and the hydraulic module can operate selectively or simultaneously.

[0186] In some embodiments, as shown in FIG2, the heat pump system further includes an economy module, which is used to reduce the temperature of the refrigerant entering the outdoor heat exchanger 211, thereby improving the heat absorption performance of the outdoor heat exchanger 211 in low-temperature environments and enhancing the subsequent heating effect.

[0187] The first end of the economy module is connected to the indoor unit 10 (specifically, the second refrigerant port 102 of the indoor unit 10), and the second end of the economy module is connected to the outdoor heat exchanger 211 (specifically, the sixth refrigerant port 2112 of the outdoor heat exchanger 211) and the third refrigerant outlet 2103. Specifically, the first end of the economy module is connected to the second refrigerant port 102 via the second switching valve 206, the liquid pipe 40, and the fourth throttling device 70, and the second end of the economy module is connected to the third refrigerant outlet 2103 via the first throttling device 212.

[0188] In other embodiments, as shown in FIG1, the heat pump system further includes an economy module and a liquid storage container 217. The first port 2171 of the liquid storage container 217 is connected to the indoor unit 10 (specifically, the second refrigerant port 102 of the indoor unit 10), and the third refrigerant outlet 2103 is connected to the pipeline between the first port 2171 of the liquid storage container 217 and the indoor unit 10 (specifically, the second refrigerant port 102 of the indoor unit 10). The second port 2172 of the liquid storage container 217 is connected to the first end of the economy module, and the second end of the economy module is connected to the outdoor heat exchanger 211 (specifically, the sixth refrigerant port 2112 of the outdoor heat exchanger 211). Specifically, the first interface 2171 of the liquid storage container 217 is connected to the second refrigerant port 102 via the second switching valve 206, the liquid pipe 40 and the fourth throttling device 70, and the third refrigerant outlet 2103 is connected to the pipeline between the first interface 2171 of the liquid storage container 217 and the fourth switching valve 208 via the first throttling device 212.

[0189] In some embodiments, as shown in Figures 1 and 2, the economy module includes an economizer 215 and a second throttling device 216. The economizer 215 includes a seventh refrigerant port 2151, an eighth refrigerant port 2152, a ninth refrigerant port 2153 connected to the seventh refrigerant port 2151, and a tenth refrigerant port 2154 connected to the eighth refrigerant port 2152. For example, the economizer 215 may be a heat exchanger, and the second throttling device 216 may be an electronic expansion valve or a thermostatic expansion valve. The electronic expansion valve and thermostatic expansion valve mentioned here are merely examples and are not intended to limit the scope of this application.

[0190] The second end of the economic module is the ninth refrigerant port 2153. The first end of the economic module is divided into two paths: one path is connected to the sixth refrigerant port 2112 via the main refrigerant path (i.e., via the seventh refrigerant port 2151 and the ninth refrigerant port 2153 in sequence), and the other path is connected to the inlet of the compressor 209 via the auxiliary refrigerant path (via the fourth throttling device 70, the eighth refrigerant port 2152 and the tenth refrigerant port 2154 in sequence).

[0191] In this embodiment, an economy module is added to the outlet of the indoor unit 10, so that the refrigerant coming out of the indoor unit 10 passes through the main refrigerant path and the auxiliary refrigerant path respectively. After the refrigerant in the auxiliary refrigerant path is throttled and cooled by the second throttling device 216, it can absorb the heat of the refrigerant from the main refrigerant path more efficiently in the economizer 215, so that the temperature of the refrigerant entering the outdoor heat exchanger 211 is lower. Especially in cold winter, the temperature of the refrigerant can be lower than the outdoor temperature, thereby improving the heat absorption performance of the outdoor heat exchanger 211 in low-temperature environments and improving the subsequent heating effect.

[0192] In some embodiments, as shown in Figures 1 and 2, the heat pump system further includes a third throttling device 219. The second end of the economy module (specifically, the ninth refrigerant port 2153 of the economizer 215) is connected to the outdoor heat exchanger 211 (specifically, the sixth refrigerant port 2112 of the outdoor heat exchanger 211) via the third throttling device 219. For example, the third throttling device 219 is an electronic expansion valve or a thermal expansion valve. The electronic expansion valve and thermal expansion valve mentioned here are merely examples and are not intended to limit the scope of this application.

[0193] In this embodiment, the temperature of the refrigerant entering the outdoor heat exchanger 211 can be further reduced by the third throttling device 219.

[0194] Furthermore, the heat pump system also includes a one-way valve 220. The outdoor heat exchanger 211 (specifically, the sixth refrigerant port 2112 of the outdoor heat exchanger 211) is also connected to the second end of the economy module (specifically, the ninth refrigerant port 2153 of the economy module) through the one-way valve 220. The flow direction of the one-way valve 220 is towards the second end of the economy module. It should be noted that the orientation of the one-way valve 220 refers to the direction of refrigerant flow, not the orientation of its spatial position.

[0195] In some embodiments, as shown in Figures 1 and 2, the heat pump system further includes a low-pressure gas-liquid separator 221, which can be found in the first embodiment described above and will not be repeated here.

[0196] In some embodiments, as shown in Figures 1 and 2, the heat pump system further includes a heat recovery branch 224, which can be found in the first embodiment described above and will not be repeated here.

[0197] In some embodiments, as shown in Figures 1 and 2, the heat pump system also includes a branch valve 225, which can be found in the first embodiment described above and will not be repeated here.

[0198] In some embodiments, as shown in Figures 1 and 2, the heat pump system further includes an oil separator 222 and an oil return pipe 223, as detailed in the first embodiment described above, and will not be repeated here.

[0199] In some embodiments, as shown in Figure 1, the compressor 209, high-pressure gas-liquid separator 210, outdoor heat exchanger 211, second reversing valve 218, fifth switching valve 213, first reversing valve 214, first throttling device 212, third switching valve 207, fourth switching valve 208, second switching valve 206, first switching valve 205, fourth throttling device 70, liquid storage container 217, economizer 215, second throttling device 216, third throttling device 219, check valve 220, low-pressure gas-liquid separator 221, oil separator 222, and oil return pipe 223 are all integrated into the outdoor unit.

[0200] In some embodiments, as shown in Figure 2, the compressor 209, high-pressure gas-liquid separator 210, outdoor heat exchanger 211, second reversing valve 218, fifth switching valve 213, first reversing valve 214, first throttling device 212, third switching valve 207, fourth switching valve 208, second switching valve 206, first switching valve 205, fourth throttling device 70, economizer 215, second throttling device 216, third throttling device 219, check valve 220, low-pressure gas-liquid separator 221, oil separator 222, and oil return pipe 223 are all integrated into the outdoor unit.

[0201] Completely, in some embodiments, as shown in Figure 1, the connection relationships between the components in the heat pump system are as follows:

[0202] One outlet of compressor 209 is connected to the first refrigerant inlet 5011a via the fifth switching valve 213 and the third switching valve 207. The other outlet of compressor 209 is connected to the third valve port 2143 of the first reversing valve 214. The first refrigerant outlet 5012a is connected to the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210 via the fourth switching valve 208. The second refrigerant outlet 2102 of the high-pressure gas-liquid separator 210 is connected to the first valve port 2141 of the first reversing valve 214. The first port 2171 of the liquid storage container 217 is connected to the main port of the liquid pipe 40 via the second switching valve 206. One path of the third refrigerant outlet 2103 of the high-pressure gas-liquid separator 210 is connected via the first throttling device 212 between the second switching valve 206 and the first interface 2171 of the liquid storage container 217. Another path of the third refrigerant outlet 2103 of the high-pressure gas-liquid separator 210 is connected via the heat recovery branch 224 to the inlet of the low-pressure gas-liquid separator 221. The outlet of the low-pressure gas-liquid separator 221 is connected to the inlet of the compressor 209. The second valve port 2142 of the first reversing valve 214 is connected to the fourth valve port 2181 of the second reversing valve 218. The fifth valve port 2182 of the second reversing valve 218 is connected to the fifth refrigerant port 2111 of the outdoor heat exchanger 211. The sixth valve port 2183 of the second reversing valve 218 is connected via the low-pressure gas-liquid separator 221 to the inlet of the compressor 209. The seventh port 2184 of the second reversing valve 218 is connected to the main interface of the gas pipe 30 via the first switching valve 205. One path of the second interface 2172 of the liquid storage container 217 is connected to the seventh refrigerant port 2151 of the economizer 215, and the other path is connected to the eighth refrigerant port 2152 of the economizer 215 via the second throttling device 216. One path of the ninth refrigerant port 2153 of the economizer 215 is connected to the sixth refrigerant port 2112 of the outdoor heat exchanger 211 via the third throttling device 219, and the other path is connected to the sixth refrigerant port 2112 of the outdoor heat exchanger 211 via the one-way valve 220, with the one-way valve 220 directed towards the ninth refrigerant port 2153 of the economizer 215. The tenth refrigerant port 2154 of the economizer 215 is connected to the inlet of the compressor 209 via the low-pressure gas-liquid separator 221.

[0203] The first outlet 5022 of the first domestic water tank 502 is connected to the first water inlet 5013a of the domestic hot water heat exchanger 501a via the first water pump 503, and the first water outlet 5014a of the domestic hot water heat exchanger 501a is connected to the first return water inlet 5023 of the first domestic water tank 502.

[0204] The first refrigerant port 101 of the indoor unit 10 is connected to the corresponding branch end in the gas pipe 30, and the second refrigerant port 102 of the indoor unit 10 is connected to the corresponding branch end in the liquid pipe 40 via the fourth throttling device 70.

[0205] The third refrigerant port 6011 of the heat exchanger 601 is connected to the corresponding branch port in the gas pipe 30, and the fourth refrigerant port 6012 of the heat exchanger 601 is connected to the corresponding branch port in the liquid pipe 40 via the fifth throttling device 604. The second water outlet 801 of the terminal 80 is connected to the second water inlet 6013 of the heat exchanger 601 via the second water pump 603, and the second water outlet 6014 of the heat exchanger 601 is connected to the second return water port 802 of the terminal 80.

[0206] Completely, in some embodiments, as shown in Figure 2, the connection relationships between the components in the heat pump system are as follows:

[0207] One outlet of compressor 209 is connected to the first refrigerant inlet 5011a via the fifth switching valve 213 and the third switching valve 207. The other outlet of compressor 209 is connected to the third valve port 2143 of the first reversing valve 214. The first refrigerant outlet 5012a is connected to the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210 via the fourth switching valve 208. The second refrigerant outlet 2102 of the high-pressure gas-liquid separator 210 is connected to the first valve port 2141 of the first reversing valve 214. One outlet of the third refrigerant outlet 2103 of the high-pressure gas-liquid separator 210 is connected to the ninth refrigerant port 2153 of the economizer 215 via the first throttling device 212. The other outlet of the third refrigerant outlet 2103 of the high-pressure gas-liquid separator 210 is connected to the inlet of the low-pressure gas-liquid separator 221 via the heat recovery branch 224. The outlet of the low-pressure gas-liquid separator 221 is connected to the inlet of compressor 209. The second port 2142 of the first reversing valve 214 is connected to the fourth port 2181 of the second reversing valve 218. The fifth port 2182 of the second reversing valve 218 is connected to the fifth refrigerant port 2111 of the outdoor heat exchanger 211. The sixth port 2183 of the second reversing valve 218 is connected to the inlet of the compressor 209 via the low-pressure gas-liquid separator 221. The seventh port 2184 of the second reversing valve 218 is connected to the main interface of the gas pipe 30 via the first switching valve 205. One path of the main interface of the liquid pipe 40 is connected to the seventh refrigerant port 2151 of the economizer 215 via the second switching valve 206, and the other path of the main interface of the liquid pipe 40 is connected to the eighth refrigerant port 2152 of the economizer 215 via the second throttling device 216. The ninth refrigerant port 2153 of the economizer 215 is connected to the sixth refrigerant port 2112 of the outdoor heat exchanger 211 via the third throttling device 219. The other connection of the ninth refrigerant port 2153 of the economizer 215 is also connected to the sixth refrigerant port 2112 of the outdoor heat exchanger 211 via a one-way valve 220, with the one-way valve 220 directed towards the ninth refrigerant port 2153 of the economizer 215. The tenth refrigerant port 2154 of the economizer 215 is connected to the inlet of the compressor 209 via a low-pressure gas-liquid separator 221.

[0208] The first outlet 5022 of the first domestic water tank 502 is connected to the first water inlet 5013a of the domestic hot water heat exchanger 501a via the first water pump 503, and the first water outlet 5014a of the domestic hot water heat exchanger 501a is connected to the first return water inlet 5023 of the first domestic water tank 502.

[0209] The first refrigerant port 101 of the indoor unit 10 is connected to the corresponding branch end in the gas pipe 30, and the second refrigerant port 102 of the indoor unit 10 is connected to the corresponding branch end in the liquid pipe 40 via the fourth throttling device 70.

[0210] The third refrigerant port 6011 of heat exchanger 601 is connected to the corresponding branch port in gas pipe 30, and the fourth refrigerant port 6012 of heat exchanger 601 is connected to the corresponding branch port in liquid pipe 40 via fifth throttling device 604. The second water outlet 801 of terminal 80 is connected to the second water inlet 6013 of heat exchanger 601 via second water pump 603, and the second water outlet 6014 of heat exchanger 601 is connected to the second return water port 802 of terminal 80. The difference between Figure 2 and Figure 1 is that Figure 1 has an additional liquid storage container 217.

[0211] Third embodiment:

[0212] As shown in Figure 4, based on the second embodiment described above, the domestic hot water heat exchanger 501a in Figures 1 and 2 is replaced with a phase change heat exchanger 501b, and the first domestic water tank 502 and the first water pump 503 are not included, while other contents remain unchanged, and other contents will not be described in detail here.

[0213] The phase change heat exchanger 501b includes a heat exchange refrigerant inlet 5011b and a heat exchange refrigerant outlet 5012b connected to the heat exchange refrigerant inlet 5011b. The outlet of the compressor 209 is connected to the heat exchange refrigerant inlet 5011b via a fifth switching valve 213 and a third switching valve 207, and the heat exchange refrigerant outlet 5012b is connected to the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210 via a fourth switching valve 208. For other details regarding the phase change heat exchanger 501b, please refer to the first embodiment described above.

[0214] In some embodiments, the heat pump system also includes a second domestic water tank (not shown), as detailed in the first embodiment described above, and will not be repeated here.

[0215] In some embodiments, the heat pump system also includes a third water pump (not shown), as detailed in the first embodiment described above, and will not be repeated here.

[0216] Based on the first, second, and third embodiments described above, the heat pump system will connect to different valve ports under different circumstances. The following will use the heat pump system shown in Figure 1 (or Figure 4) to illustrate the refrigerant flow direction in each mode, as detailed below:

[0217] As shown in Figure 5, in the cooling and total heat recovery domestic hot water mode, the first throttling device 212, the fourth throttling device 70, the first switching valve 205, the second switching valve 206, the third switching valve 207, the fourth switching valve 208 and the fifth switching valve 213 are opened, the seventh valve port 2184 of the second reversing valve 218 is connected to the sixth valve port 2183, and a domestic hot water module 50 and a hydraulic module 60 are configured. That is, when hot water needs to be prepared quickly in cooling mode, the high-temperature gaseous refrigerant output from the compressor 209 enters the first refrigerant inlet 5011a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant inlet 5011b of the phase change heat exchanger 501b) after passing through the fifth switch valve 213 and the third switch valve 207. The high-temperature gaseous refrigerant exchanges heat with the water in the first domestic water tank 502 in the domestic hot water heat exchanger 501a (or with the water in the phase change heat exchanger 501b), and becomes a medium-temperature liquid refrigerant after preparing hot water. The medium-temperature liquid refrigerant output from the first refrigerant outlet 5012a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant outlet 5012b of the phase change heat exchanger 501b) enters the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210, where further gas-liquid separation is carried out to ensure that the refrigerant output from the third refrigerant outlet 2103 is pure liquid. The medium-temperature liquid refrigerant output from the third refrigerant outlet 2103 is throttled and cooled by the first throttling device 212, becoming a lower-temperature liquid refrigerant. It then enters the liquid pipe 40 through the second switching valve 206. The medium-temperature liquid refrigerant enters the fourth throttling device 70 in the liquid pipe 40, and is throttled and cooled by the fourth throttling device 70, becoming a lower-temperature liquid refrigerant. It then enters the second refrigerant port 102 of the indoor unit 10. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 10. After absorbing heat from the indoor air, the low-temperature liquid refrigerant evaporates into a low-temperature gaseous refrigerant. The indoor unit 10 blows out cold air, and the low-temperature gaseous refrigerant output from the first refrigerant port 101 of the indoor unit 10 enters the gas pipe 30. Furthermore, the medium-temperature liquid refrigerant enters the fifth throttling device 604 within the liquid pipe 40. After being throttled and cooled by the fifth throttling device 604, it becomes a lower-temperature liquid refrigerant, which then enters the fourth refrigerant port 6012 of the heat exchanger 601. In the heat exchanger 601, the low-temperature liquid refrigerant exchanges heat with the water in the external terminal 80. The low-temperature liquid refrigerant absorbs heat from the water and evaporates into a low-temperature gaseous refrigerant, turning the water in the external terminal 80 into cold water. The low-temperature gaseous refrigerant output from the third refrigerant port 6011 of the heat exchanger 601 enters the gas pipe 30. The low-temperature gaseous refrigerant output from the gas pipe 30 passes through the first switching valve 205, the seventh valve port 2184 and the sixth valve port 2183 of the first reversing valve 214, and the low-pressure gas-liquid separator 221 before returning to the inlet of the compressor 209, in a continuous cycle.By configuring the domestic hot water module 50, all the condensation heat originally used for heat exchange with the air in the outdoor heat exchanger 211 can be recovered and reused during cooling, avoiding heat waste due to heat exchange between the outdoor heat exchanger 211 and the air. The recovered heat is exchanged with water in the first domestic water tank 502 in the domestic hot water heat exchanger 501a (or with water in the phase change heat exchanger 501b), quickly producing hot water, improving energy efficiency and increasing the speed of hot water production. Furthermore, by configuring the hydraulic module 60, ground cooling and other effects can be achieved simultaneously with cooling, further improving energy efficiency.

[0218] When the domestic hot water reaches a certain temperature, it can be switched to a cooling and waste heat recovery domestic hot water mode, as shown in Figure 6. In the cooling and waste heat recovery domestic hot water mode, the fourth throttling device 70, the first switching valve 205, the second switching valve 206, the third switching valve 207, the fourth switching valve 208, and the fifth switching valve 213 are opened. The first valve port 2141 of the first reversing valve 214 is connected to the second valve port 2142. The fourth valve port 2181 of the second reversing valve 218 is connected to the fifth valve port 2182. The seventh valve port 2184 of the second reversing valve 218 is connected to the sixth valve port 2183. A domestic hot water module 50 and a hydraulic module 60 are configured. That is, when hot water needs to be prepared in cooling mode, the high-temperature gaseous refrigerant output from the compressor 209 enters the first refrigerant inlet 5011a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant inlet 5011b of the phase change heat exchanger 501b) after passing through the fifth switch valve 213 and the third switch valve 207. The high-temperature gaseous refrigerant exchanges heat with the water in the first domestic water tank 502 in the domestic hot water heat exchanger 501a (or with the water in the phase change heat exchanger 501b). After preparing hot water, it becomes a medium-temperature gaseous refrigerant. The medium-temperature gaseous refrigerant output from the first refrigerant outlet 5012a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant outlet 5012b of the phase change heat exchanger 501b) enters the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210. Further gas-liquid separation is carried out in the high-pressure gas-liquid separator 210 to ensure that the refrigerant output from the second refrigerant outlet 2102 is pure gas. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 2102 enters the fifth refrigerant port 2111 of the outdoor heat exchanger 211 after passing through the first valve port 2141 and the second valve port 2142 of the first reversing valve 214 and the fourth valve port 2181 and the fifth valve port 2182 of the second reversing valve 218. The medium-temperature gaseous refrigerant condenses and releases heat in the outdoor heat exchanger 211 and becomes a medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the sixth refrigerant port 2112 of the outdoor heat exchanger 211 enters the second interface 2172 of the liquid storage container 217 after passing through the one-way valve 220, the ninth refrigerant port 2153 and the seventh refrigerant port 2151 of the economizer 215. The medium-temperature liquid refrigerant output from the first interface 2171 of the liquid storage container 217 enters the liquid pipe 40 through the second switching valve 206. The medium-temperature liquid refrigerant enters the fourth throttling device 70 in the liquid pipe 40. After being throttled and cooled by the fourth throttling device 70, it becomes a lower-temperature liquid refrigerant and then enters the second refrigerant port 102 of the indoor unit 10. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 10. After absorbing the heat from the indoor air, the low-temperature liquid refrigerant evaporates into a low-temperature gaseous refrigerant. The indoor unit 10 blows out cold air, and the low-temperature gaseous refrigerant output from the first refrigerant port 101 of the indoor unit 10 enters the gas pipe 30.Furthermore, the medium-temperature liquid refrigerant enters the fifth throttling device 604 within the liquid pipe 40. After being throttled and cooled by the fifth throttling device 604, it becomes a lower-temperature liquid refrigerant, which then enters the fourth refrigerant port 6012 of the heat exchanger 601. In the heat exchanger 601, the low-temperature liquid refrigerant exchanges heat with the water in the external terminal 80. The low-temperature liquid refrigerant absorbs heat from the water and evaporates into a low-temperature gaseous refrigerant, turning the water in the external terminal 80 into cold water. The low-temperature gaseous refrigerant output from the third refrigerant port 6011 of the heat exchanger 601 enters the gas pipe 30. The low-temperature gaseous refrigerant output from the gas pipe 30 passes through the first switching valve 205, the seventh valve port 2184 and the sixth valve port 2183 of the first reversing valve 214, and the low-pressure gas-liquid separator 221 before returning to the inlet of the compressor 209, in a continuous cycle. By configuring the domestic hot water module 50, at least a portion of the condensation heat originally used for heat exchange with the air in the outdoor heat exchanger 211 can be recovered and reused during summer cooling. This avoids the waste of heat due to heat exchange between the outdoor heat exchanger 211 and the air. The recovered heat is exchanged with water in the first domestic water tank 502 in the domestic hot water heat exchanger 501a (or with water in the phase change heat exchanger 501b) to produce hot water, thus improving energy efficiency. Furthermore, by configuring the hydraulic module 60, ground cooling and other effects can be achieved simultaneously with cooling, further improving energy efficiency.

[0219] Specifically, the difference between the embodiments shown in Figure 6 and Figure 5 is that Figure 6 shows the recovery and reuse of at least a portion of the condensation heat originally used by the outdoor heat exchanger 211 for heat exchange with the air, while Figure 5 shows the recovery and reuse of all the condensation heat originally used by the outdoor heat exchanger 211 for heat exchange with the air.

[0220] As shown in Figure 7, in the cooling and waste heat recovery domestic hot water production mode, the fourth throttling device 70, the first switching valve 205, the second switching valve 206, the third switching valve 207, the fourth switching valve 208, and the fifth switching valve 213 are opened. The second valve port 2142 of the first reversing valve 214 is connected to the first valve port 2141 and the third valve port 2143. The fourth valve port 2181 of the second reversing valve 218 is connected to the fifth valve port 2182. The seventh valve port 2184 of the second reversing valve 218 is connected to the sixth valve port 2183. The domestic hot water module 50 and the hydraulic module 60 are configured. That is, when hot water needs to be prepared in cooling mode, the high-temperature gaseous refrigerant output from the outlet of compressor 209 enters the first refrigerant inlet 5011a of domestic hot water heat exchanger 501a (or the heat exchange refrigerant inlet 5011b of phase change heat exchanger 501b) after passing through the fifth switch valve 213 and the third switch valve 207. The high-temperature gaseous refrigerant output from the outlet of compressor 209 enters the fifth refrigerant port 2111 of outdoor heat exchanger 211 after passing through the third valve port 2143 and the second valve port 2142 of the first reversing valve 214 and the fourth valve port 2181 and the fifth valve port 2182 of the second reversing valve 218. The high-temperature gaseous refrigerant exchanges heat with the water in the first domestic water tank 502 in the domestic hot water heat exchanger 501a (or with the water in the phase change heat exchanger 501b) to produce hot water, and then becomes a medium-temperature gaseous refrigerant. The medium-temperature gaseous refrigerant output from the first refrigerant outlet 5012a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant outlet 5012b of the phase change heat exchanger 501b) enters the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210, where further gas-liquid separation is carried out to ensure that the refrigerant output from the second refrigerant outlet 2102 is pure gas. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 2102 enters the fifth refrigerant port 2111 of the outdoor heat exchanger 211 after passing through the first valve port 2141 and the second valve port 2142 of the first reversing valve 214 and the fourth valve port 2181 and the fifth valve port 2182 of the second reversing valve 218. The medium-temperature gaseous refrigerant condenses and releases heat in the outdoor heat exchanger 211 and becomes a medium-temperature liquid refrigerant.The medium-temperature liquid refrigerant output from the sixth refrigerant port 2112 of the outdoor heat exchanger 211 enters the second interface 2172 of the liquid storage container 217 after passing through the one-way valve 220, the ninth refrigerant port 2153 and the seventh refrigerant port 2151 of the economizer 215. The medium-temperature liquid refrigerant output from the first interface 2171 of the liquid storage container 217 enters the liquid pipe 40 through the second switching valve 206. The medium-temperature liquid refrigerant enters the fourth throttling device 70 in the liquid pipe 40. After being throttled and cooled by the fourth throttling device 70, it becomes a lower-temperature liquid refrigerant and then enters the second refrigerant port 102 of the indoor unit 10. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 10. After absorbing the heat from the indoor air, the low-temperature liquid refrigerant evaporates into a low-temperature gaseous refrigerant. The indoor unit 10 blows out cold air, and the low-temperature gaseous refrigerant output from the first refrigerant port 101 of the indoor unit 10 enters the gas pipe 30. Furthermore, the medium-temperature liquid refrigerant enters the fifth throttling device 604 within the liquid pipe 40. After being throttled and cooled by the fifth throttling device 604, it becomes a lower-temperature liquid refrigerant, which then enters the fourth refrigerant port 6012 of the heat exchanger 601. In the heat exchanger 601, the low-temperature liquid refrigerant exchanges heat with the water in the external terminal 80. The low-temperature liquid refrigerant absorbs heat from the water and evaporates into a low-temperature gaseous refrigerant, turning the water in the external terminal 80 into cold water. The low-temperature gaseous refrigerant output from the third refrigerant port 6011 of the heat exchanger 601 enters the gas pipe 30. The low-temperature gaseous refrigerant output from the gas pipe 30 passes through the first switching valve 205, the seventh valve port 2184 and the sixth valve port 2183 of the first reversing valve 214, and the low-pressure gas-liquid separator 221 before returning to the inlet of the compressor 209, in a continuous cycle.

[0221] Specifically, the difference between the embodiments shown in Figure 7 and Figure 6 is that in the embodiment shown in Figure 7, an additional refrigerant path enters the outdoor heat exchanger 211 after passing through the third valve port 2143 and the second valve port 2142 of the first reversing valve 214 and the fourth valve port 2181 and the fifth valve port 2182 of the second reversing valve 218. This allows for better control of the amount of refrigerant entering the domestic hot water heat exchanger 501a (or phase change heat exchanger 501b). Furthermore, the path where the refrigerant from the compressor 209 directly reaches the second reversing valve 218 can be more guaranteed to be pure gaseous refrigerant. Pure gaseous refrigerant can better ensure that the second reversing valve 218 has sufficient pressure difference for reversing, thus reducing pressure loss in the refrigerant pipeline.

[0222] As shown in Figure 8, in the heating and domestic hot water mode, the second throttling device 216, the third throttling device 219, the fourth throttling device 70, the first switching valve 205, the second switching valve 206, the third switching valve 207, the fourth switching valve 208, and the fifth switching valve 213 are opened. The first valve port 2141 of the first reversing valve 214 is connected to the second valve port 2142. The fourth valve port 2181 of the second reversing valve 218 is connected to the seventh valve port 2184. The fifth valve port 2182 of the second reversing valve 218 is connected to the sixth valve port 2183. A domestic hot water module 50 and a hydraulic module 60 are also configured. That is, when hot water needs to be prepared in heating mode, the high-temperature gaseous refrigerant output from the compressor 209 enters the first refrigerant inlet 5011a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant inlet 5011b of the phase change heat exchanger 501b) after passing through the fifth switch valve 213 and the third switch valve 207. The high-temperature gaseous refrigerant exchanges heat with the water in the first domestic water tank 502 in the domestic hot water heat exchanger 501a (or exchanges heat with the water in the phase change heat exchanger 501b). After preparing hot water, it becomes a medium-temperature gaseous refrigerant. The medium-temperature gaseous refrigerant output from the first refrigerant outlet 5012a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant outlet 5012b of the phase change heat exchanger 501b) enters the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210. Further gas-liquid separation is carried out in the high-pressure gas-liquid separator 210 to ensure that the refrigerant output from the second refrigerant outlet 2102 is pure gas. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 2102 passes through the first valve port 2141 and the second valve port 2142 of the first reversing valve 214, the fourth valve port 2181 and the seventh valve port 2184 of the second reversing valve 218, and the first switching valve 205 before entering the gas pipe 30. The medium-temperature gaseous refrigerant then enters the first refrigerant port 101 of the indoor unit 10 within the gas pipe 30. The medium-temperature gaseous refrigerant exchanges heat with the indoor air in the indoor unit 10, and after releasing heat into the indoor air, it condenses into medium-temperature liquid refrigerant. The indoor unit 10 blows out hot air. The medium-temperature liquid refrigerant output from the second refrigerant port 102 of the indoor unit 10 is throttled and cooled by the fourth throttling device 70, becoming low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the fourth throttling device 70 enters the liquid pipe 40. Furthermore, the medium-temperature gaseous refrigerant enters the third refrigerant port 6011 of the heat exchanger 601 of the hydraulic module 60 through the gas pipe 30. After heat exchange with the water in the external terminal 80 in the heat exchanger 601, the medium-temperature gaseous refrigerant becomes a medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the fourth refrigerant port 6012 of the heat exchanger 601 is throttled and cooled by the fifth throttling device 604, becoming a low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the fifth throttling device 604 enters the liquid pipe 40.The low-temperature liquid refrigerant output from liquid line 40 enters the first port 2171 of the liquid storage container 217 after passing through the second switching valve 206. The low-temperature liquid refrigerant output from the second port 2172 of the liquid storage container 217 enters the main refrigerant circuit and the auxiliary refrigerant circuit respectively. The low-temperature liquid refrigerant in the auxiliary refrigerant circuit is throttled and cooled by the second throttling device 216, becoming an even lower-temperature liquid refrigerant. The even lower-temperature liquid refrigerant absorbs heat from the refrigerant in the main refrigerant circuit in the economizer 215, becoming a high-temperature gaseous refrigerant. Finally, it returns to the inlet of the compressor 209 through the low-pressure gas-liquid separator 221. The low-temperature liquid refrigerant from the main refrigerant circuit... After the warm liquid refrigerant is cooled by heat exchange, it becomes an even lower-temperature liquid refrigerant. It then enters the third throttling device 219 for further cooling, becoming an even lower-temperature liquid refrigerant. This liquid refrigerant then enters the sixth refrigerant port 2112 of the outdoor heat exchanger 211. In the outdoor heat exchanger 211, the low-temperature liquid refrigerant evaporates and absorbs heat, becoming a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the fifth refrigerant port 2111 of the outdoor heat exchanger 211 passes through the fifth valve port 2182 and the sixth valve port 2183 of the second reversing valve 218, and then through the low-pressure gas-liquid separator 221 before returning to the inlet of the compressor 209, repeating the cycle. By configuring the domestic hot water module 50 and the hydraulic module 60, hot water can be produced simultaneously with heating, and underfloor heating can also be implemented, improving energy efficiency.

[0223] As shown in Figure 9, in the heating and domestic hot water mode, the second throttling device 216, the third throttling device 219, the fourth throttling device 70, the first switching valve 205, the second switching valve 206, the third switching valve 207, the fourth switching valve 208, and the fifth switching valve 213 are opened. The second valve port 2142 of the first reversing valve 214 is connected to the first valve port 2141 and the third valve port 2143. The fourth valve port 2181 of the second reversing valve 218 is connected to the seventh valve port 2184. The fifth valve port 2182 of the second reversing valve 218 is connected to the sixth valve port 2183. A domestic hot water module 50 and a hydraulic module 60 are also configured. That is, when hot water needs to be prepared in heating mode, the high-temperature gaseous refrigerant output from the outlet of compressor 209 enters the first refrigerant inlet 5011a of domestic hot water heat exchanger 501a (or the heat exchange refrigerant inlet 5011b of phase change heat exchanger 501b) after passing through the fifth switch valve 213 and the third switch valve 207. The high-temperature gaseous refrigerant output from the outlet of compressor 209 enters the gas pipe 30 through the third valve port 2143 and the second valve port 2142 of the first reversing valve 214, the fourth valve port 2181 and the seventh valve port 2184 of the second reversing valve 218, and the first switch valve 205. High-temperature gaseous refrigerant exchanges heat with water in the first domestic water tank 502 in the domestic hot water heat exchanger 501a (or with water in the phase change heat exchanger 501b) to produce hot water, becoming medium-temperature gaseous refrigerant. The medium-temperature gaseous refrigerant output from the first refrigerant outlet 5012a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant outlet 5012b of the phase change heat exchanger 501b) enters the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210, where further gas-liquid separation is performed to ensure that the refrigerant output from the second refrigerant outlet 2102 is pure gas. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 2102 enters the gas pipe 30 after passing through the first valve port 2141 and the second valve port 2142 of the first reversing valve 214, the fourth valve port 2181 and the seventh valve port 2184 of the second reversing valve 218, and the first switching valve 205. The medium-temperature gaseous refrigerant enters the first refrigerant port 101 of the indoor unit 10 through the gas pipe 30. The medium-temperature gaseous refrigerant exchanges heat with the indoor air in the indoor unit 10. After releasing heat into the indoor air, the medium-temperature gaseous refrigerant condenses into medium-temperature liquid refrigerant. The indoor unit 10 blows out hot air. The medium-temperature liquid refrigerant output from the second refrigerant port 102 of the indoor unit 10 is throttled and cooled by the fourth throttling device 70 and becomes low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the fourth throttling device 70 enters the liquid pipe 40.Furthermore, the medium-temperature gaseous refrigerant enters the third refrigerant port 6011 of the heat exchanger 601 of the hydraulic module 60 through the gas pipe 30. After heat exchange with the water in the external terminal 80 in the heat exchanger 601, the medium-temperature gaseous refrigerant becomes a medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the fourth refrigerant port 6012 of the heat exchanger 601 is throttled and cooled by the fifth throttling device 604, becoming a low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the fifth throttling device 604 enters the liquid pipe 40. The low-temperature liquid refrigerant output from liquid line 40 enters the first port 2171 of the liquid storage container 217 after passing through the second switching valve 206. The low-temperature liquid refrigerant output from the second port 2172 of the liquid storage container 217 enters the main refrigerant circuit and the auxiliary refrigerant circuit respectively. The low-temperature liquid refrigerant in the auxiliary refrigerant circuit is throttled and cooled by the second throttling device 216, becoming an even lower-temperature liquid refrigerant. The even lower-temperature liquid refrigerant absorbs heat from the refrigerant in the main refrigerant circuit in the economizer 215, becoming a high-temperature gaseous refrigerant. Finally, it returns to the inlet of the compressor 209 through the low-pressure gas-liquid separator 221. The low-temperature liquid refrigerant from the main refrigerant circuit... After the warm liquid refrigerant is cooled down by heat exchange, it becomes a lower-temperature liquid refrigerant. It then enters the third throttling device 219 for further throttling and cooling, becoming an even lower-temperature liquid refrigerant. It then enters the sixth refrigerant port 2112 of the outdoor heat exchanger 211. The low-temperature liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 211, becoming a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the fifth refrigerant port 2111 of the outdoor heat exchanger 211 passes through the fifth valve port 2182 and the sixth valve port 2183 of the second reversing valve 218 and the low-pressure gas-liquid separator 221 before returning to the inlet of the compressor 209, repeating the cycle.

[0224] Specifically, the difference between the embodiments shown in Figure 9 and Figure 8 is that in the embodiment shown in Figure 9, an additional path leads to the gas pipe 30 after the first valve port 2141 and the second valve port 2142 of the first reversing valve 214, the fourth valve port 2181 and the seventh valve port 2184 of the second reversing valve 218, and the first switching valve 205. This allows for better control of the amount of refrigerant entering the domestic hot water heat exchanger 501a (or phase change heat exchanger 501b), and the path from the compressor 209 directly to the second reversing valve 218 can be guaranteed to be gaseous refrigerant. Pure gaseous refrigerant can better ensure that the second reversing valve 218 has sufficient pressure difference for reversing, thus reducing the pressure loss of the refrigerant pipeline.

[0225] As shown in Figure 10, in pure hot water mode, the first throttling device 212, the second throttling device 216, the third throttling device 219, the third switching valve 207, the fourth switching valve 208 and the fifth switching valve 213 are opened, the fifth valve port 2182 of the second reversing valve 218 is connected to the sixth valve port 2183, and a domestic hot water module 50 is configured. That is, when only hot water needs to be produced, the high-temperature gaseous refrigerant output from the outlet of the compressor 209 enters the domestic hot water heat exchanger 501a (or phase change heat exchanger 501b) after passing through the fifth switch valve 213 and the third switch valve 207. The high-temperature gaseous refrigerant exchanges heat with the water in the first domestic water tank 502 in the domestic hot water heat exchanger 501a (or exchanges heat with the water in the phase change heat exchanger 501b), and becomes a medium-temperature liquid refrigerant after producing hot water. The medium-temperature liquid refrigerant output from the first refrigerant outlet 5012a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant outlet 5012b of the phase change heat exchanger 501b) enters the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210, where further gas-liquid separation is carried out to ensure that the refrigerant output from the third refrigerant outlet 2103 is pure liquid. The medium-temperature liquid refrigerant output from the third refrigerant outlet 2103 is throttled and cooled by the first throttling device 212, becoming a lower-temperature liquid refrigerant. It then enters the first port 2171 of the liquid storage container 217. The low-temperature liquid refrigerant output from the second port 2172 of the liquid storage container 217 enters either the main refrigerant circuit or the auxiliary refrigerant circuit. The low-temperature liquid refrigerant in the auxiliary circuit is throttled and cooled by the second throttling device 216, becoming an even lower-temperature liquid refrigerant. This lower-temperature liquid refrigerant absorbs heat from the main refrigerant circuit in the economizer 215, becoming a high-temperature gaseous refrigerant. Finally, it returns to the compressor 20 via the low-pressure gas-liquid separator 221. The low-temperature liquid refrigerant from the main refrigerant circuit is cooled by heat exchange and becomes an even lower-temperature liquid refrigerant. It then enters the third throttling device 219 for further throttling and cooling, becoming an even lower-temperature liquid refrigerant. It then enters the sixth refrigerant port 2112 of the outdoor heat exchanger 211. The low-temperature liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 211, becoming a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the fifth refrigerant port 2111 of the outdoor heat exchanger 211 passes through the fifth valve port 2182 and the sixth valve port 2183 of the second reversing valve 218 and the low-pressure gas-liquid separator 221 before returning to the inlet of the compressor 209, repeating the cycle.

[0226] As shown in Figure 11, in cooling mode, the fourth throttling device 70, the first switching valve 205, and the second switching valve 206 are open. The third valve port 2143 of the first reversing valve 214 is connected to the second valve port 2142. The fourth valve port 2181 of the second reversing valve 218 is connected to the fifth valve port 2182. The seventh valve port 2184 of the second reversing valve 218 is connected to the sixth valve port 2183. A hydraulic module 60 is also configured. That is, during summer cooling, the high-temperature gaseous refrigerant output from the compressor 209 enters the fifth refrigerant port 2111 of the outdoor heat exchanger 211 after passing through the third valve port 2143 and the second valve port 2142 of the first reversing valve 214, and the fourth valve port 2181 and the fifth valve port 2182 of the second reversing valve 218. The medium-temperature gaseous refrigerant condenses and releases heat in the outdoor heat exchanger 211, becoming a medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the sixth refrigerant port 2112 of the outdoor heat exchanger 211 enters the second interface 2172 of the liquid storage container 217 after passing through the one-way valve 220, the ninth refrigerant port 2153 and the seventh refrigerant port 2151 of the economizer 215. The medium-temperature liquid refrigerant output from the first interface 2171 of the liquid storage container 217 enters the liquid pipe 40 through the second switching valve 206. The medium-temperature liquid refrigerant enters the fourth throttling device 70 in the liquid pipe 40. After being throttled and cooled by the fourth throttling device 70, it becomes a lower-temperature liquid refrigerant and then enters the second refrigerant port 102 of the indoor unit 10. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 10. After absorbing the heat from the indoor air, the low-temperature liquid refrigerant evaporates into a low-temperature gaseous refrigerant. The indoor unit 10 blows out cold air, and the low-temperature gaseous refrigerant output from the first refrigerant port 101 of the indoor unit 10 enters the gas pipe 30. Furthermore, the medium-temperature liquid refrigerant enters the fifth throttling device 604 within the liquid pipe 40. After being throttled and cooled by the fifth throttling device 604, it becomes a lower-temperature liquid refrigerant, which then enters the fourth refrigerant port 6012 of the heat exchanger 601. In the heat exchanger 601, the low-temperature liquid refrigerant exchanges heat with the water in the external terminal 80. The low-temperature liquid refrigerant absorbs heat from the water and evaporates into a low-temperature gaseous refrigerant, turning the water in the external terminal 80 into cold water. The low-temperature gaseous refrigerant output from the third refrigerant port 6011 of the heat exchanger 601 enters the gas pipe 30. The low-temperature gaseous refrigerant output from the gas pipe 30 passes through the first switching valve 205, the seventh valve port 2184 and the sixth valve port 2183 of the first reversing valve 214, and the low-pressure gas-liquid separator 221 before returning to the inlet of the compressor 209, repeating the cycle. By configuring the hydraulic module 60, cooling and ground cooling effects can be achieved simultaneously, improving energy efficiency.

[0227] As shown in Figure 12, in heating mode, the second throttling device 216, the third throttling device 219, the fourth throttling device 70, the first switching valve 205, and the second switching valve 206 are open. The second valve port 2142 of the first reversing valve 214 is connected to the third valve port 2143, the fourth valve port 2181 of the second reversing valve 218 is connected to the seventh valve port 2184, and the fifth valve port 2182 of the second reversing valve 218 is connected to the sixth valve port 2183. A hydraulic module 60 is also configured. That is, when heating in winter, the high-temperature gaseous refrigerant output from the compressor 209 enters the gas pipe 30 through the third valve port 2143 and the second valve port 2142 of the first reversing valve 214, the fourth valve port 2181 and the seventh valve port 2184 of the second reversing valve 218, and the first switching valve 205. The medium-temperature gaseous refrigerant enters the first refrigerant port 101 of the indoor unit 10 through the gas pipe 30. The medium-temperature gaseous refrigerant exchanges heat with the indoor air in the indoor unit 10. After releasing heat into the indoor air, the medium-temperature gaseous refrigerant condenses into medium-temperature liquid refrigerant. The indoor unit 10 blows out hot air. The medium-temperature liquid refrigerant output from the second refrigerant port 102 of the indoor unit 10 is throttled and cooled by the fourth throttling device 70 and becomes low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the fourth throttling device 70 enters the liquid pipe 40. Furthermore, the medium-temperature gaseous refrigerant enters the third refrigerant port 6011 of the heat exchanger 601 of the hydraulic module 60 through the gas pipe 30. After heat exchange with the water in the external terminal 80 in the heat exchanger 601, the medium-temperature gaseous refrigerant becomes a medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the fourth refrigerant port 6012 of the heat exchanger 601 is throttled and cooled by the fifth throttling device 604, becoming a low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the fifth throttling device 604 enters the liquid pipe 40. The low-temperature liquid refrigerant output from liquid line 40 enters the first port 2171 of the liquid storage container 217 after passing through the second switching valve 206. The low-temperature liquid refrigerant output from the second port 2172 of the liquid storage container 217 enters the main refrigerant circuit and the auxiliary refrigerant circuit respectively. The low-temperature liquid refrigerant in the auxiliary refrigerant circuit is throttled and cooled by the second throttling device 216, becoming an even lower-temperature liquid refrigerant. The even lower-temperature liquid refrigerant absorbs heat from the refrigerant in the main refrigerant circuit in the economizer 215, becoming a high-temperature gaseous refrigerant. Finally, it returns to the inlet of the compressor 209 through the low-pressure gas-liquid separator 221. The low-temperature liquid refrigerant from the main refrigerant circuit... After the warm liquid refrigerant is cooled down by heat exchange, it becomes a lower-temperature liquid refrigerant. It then enters the third throttling device 219 for further throttling and cooling, becoming an even lower-temperature liquid refrigerant. It then enters the sixth refrigerant port 2112 of the outdoor heat exchanger 211. The low-temperature liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 211, becoming a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the fifth refrigerant port 2111 of the outdoor heat exchanger 211 passes through the fifth valve port 2182 and the sixth valve port 2183 of the second reversing valve 218 and the low-pressure gas-liquid separator 221 before returning to the inlet of the compressor 209, repeating the cycle.By configuring the hydraulic module 60, it is possible to achieve effects such as underfloor heating while providing heating, thereby improving energy efficiency.

[0228] It should be noted that the terms high, medium, and low temperatures mentioned above are only relative descriptions, and gaseous refrigerant can also refer to a two-phase state of gas and liquid or a gaseous state, which is not limited here.

[0229] Under different conditions, the heat pump system shown in Figure 2 will correspond to different valve connections and different operating modes. The cooling and waste heat recovery mode for domestic hot water, the heating and domestic hot water mode, the cooling mode, and the heating mode all have the same refrigerant flow direction as the heat pump system shown in Figure 1 or Figure 4, except for the absence of the liquid storage container 217, which will not be elaborated further here. The cooling and total heat recovery mode for domestic hot water and the pure hot water mode of the heat pump system shown in Figure 2 are as follows:

[0230] As shown in Figure 13, in the cooling and total heat recovery domestic hot water mode, the first throttling device 212, the fourth throttling device 70, the first switching valve 205, the second switching valve 206, the third switching valve 207, the fourth switching valve 208 and the fifth switching valve 213 are opened, the seventh valve port 2184 of the second reversing valve 218 is connected to the sixth valve port 2183, and a domestic hot water module 50 and a hydraulic module 60 are configured. That is, when hot water needs to be prepared quickly in cooling mode, the high-temperature gaseous refrigerant output from the compressor 209 enters the first refrigerant inlet 5011a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant inlet 5011b of the phase change heat exchanger 501b) after passing through the fifth switch valve 213 and the third switch valve 207. The high-temperature gaseous refrigerant exchanges heat with the water in the first domestic water tank 502 in the domestic hot water heat exchanger 501a (or with the water in the phase change heat exchanger 501b), and becomes a medium-temperature liquid refrigerant after preparing hot water. The medium-temperature liquid refrigerant output from the first refrigerant outlet 5012a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant outlet 5012b of the phase change heat exchanger 501b) enters the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210, where further gas-liquid separation is carried out to ensure that the refrigerant output from the third refrigerant outlet 2103 is pure liquid. The medium-temperature liquid refrigerant output from the third refrigerant outlet 2103 is throttled and cooled by the first throttling device 212, becoming a lower-temperature liquid refrigerant. Then, it enters the liquid pipe 40 through the ninth refrigerant port 2153 and the seventh refrigerant port 2151 of the economizer 215 and the second switching valve 206. The medium-temperature liquid refrigerant enters the fourth throttling device 70 in the liquid pipe 40, and after being throttled and cooled by the fourth throttling device 70, it becomes a lower-temperature liquid refrigerant. Then, it enters the second refrigerant port 102 of the indoor unit 10. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 10. After absorbing the heat from the indoor air, the low-temperature liquid refrigerant evaporates into a low-temperature gaseous refrigerant. The indoor unit 10 blows out cold air, and the low-temperature gaseous refrigerant output from the first refrigerant port 101 of the indoor unit 10 enters the gas pipe 30. Furthermore, the medium-temperature liquid refrigerant enters the fifth throttling device 604 within the liquid pipe 40. After being throttled and cooled by the fifth throttling device 604, it becomes a lower-temperature liquid refrigerant, which then enters the fourth refrigerant port 6012 of the heat exchanger 601. The low-temperature liquid refrigerant exchanges heat with the water in the external terminal 80 within the heat exchanger 601. The low-temperature liquid refrigerant absorbs heat from the water and evaporates into a low-temperature gaseous refrigerant. The water in the external terminal 80 becomes cold water. The low-temperature gaseous refrigerant output from the third refrigerant port 6011 of the cold water heat exchanger 601 enters the gas pipe 30. The low-temperature gaseous refrigerant output from the gas pipe 30 passes through the first switching valve 205, the seventh valve port 2184 and the sixth valve port 2183 of the first reversing valve 214, and then returns to the inlet of the compressor 209 through the low-pressure gas-liquid separator 221, repeating the cycle.

[0231] As shown in Figure 14, in pure hot water mode, the first throttling device 212, the third throttling device 219, the third switching valve 207, the fourth switching valve 208 and the fifth switching valve 213 are opened, the fifth valve port 2182 of the second reversing valve 218 is connected to the sixth valve port 2183, and a domestic hot water module 50 is configured. That is, when only hot water needs to be produced, the high-temperature gaseous refrigerant output from the compressor 209 enters the first refrigerant inlet 5011a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant inlet 5011b of the phase change heat exchanger 501b) after passing through the fifth switch valve 213 and the third switch valve 207. The high-temperature gaseous refrigerant exchanges heat with the water in the first domestic water tank 502 in the domestic hot water heat exchanger 501a (or exchanges heat with the water in the phase change heat exchanger 501b), and becomes a medium-temperature liquid refrigerant after producing hot water. The medium-temperature liquid refrigerant output from the first refrigerant outlet 5012a of the domestic hot water heat exchanger 501a (or the heat exchange refrigerant outlet 5012b of the phase change heat exchanger 501b) enters the second refrigerant inlet 2101 of the high-pressure gas-liquid separator 210, where further gas-liquid separation is carried out to ensure that the refrigerant output from the third refrigerant outlet 2103 is pure liquid. The medium-temperature liquid refrigerant output from the third refrigerant outlet 2103 is throttled and cooled by the first throttling device 212, becoming a lower-temperature liquid refrigerant. Then, it is further throttled and cooled by the third throttling device 219, becoming an even lower-temperature liquid refrigerant. The low-temperature liquid refrigerant output from the third throttling device 219 enters the sixth refrigerant port 2112 of the outdoor heat exchanger 211. The low-temperature liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 211, becoming a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the fifth refrigerant port 2111 of the outdoor heat exchanger 211 passes through the fifth valve port 2182 and the sixth valve port 2183 of the second reversing valve 218 and the low-pressure gas-liquid separator 221 before returning to the inlet of the compressor 209, repeating the cycle.

[0232] Under different conditions, the heat pump system shown in Figure 3 will also have different valve ports connected. The refrigerant flow direction in various modes is the same as that in the heat pump system shown in Figure 1, except that the switching of the fifth switching valve 213 and the conduction of the first reversing valve 214 are different. Other details will not be elaborated further. Specifically:

[0233] In the domestic hot water mode and the pure hot water mode, the first valve port 2141 of the first reversing valve 214 is connected to the second valve port 2142.

[0234] In the cooling and waste heat recovery domestic hot water production mode and the heating and domestic hot water production mode, the first valve port 2141 of the first reversing valve 214 is connected to the second valve port 2142, or the first valve port 2141 of the first reversing valve 214 is connected to the second valve port 2142 and the third valve port 2143, and the fifth switching valve 213 is opened.

[0235] In cooling and heating modes, the first valve port 2141 of the first reversing valve 214 is connected to the third valve port 2143.

[0236] It is understood that the above embodiments only illustrate some implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application's patent. It should be noted that those skilled in the art can freely combine the above embodiments or technical features without departing from the concept of this application, and can also make several modifications and improvements, all of which fall within the protection scope of this application. That is, the embodiments described "in some embodiments" can be freely combined with any of the preceding and following embodiments. Therefore, all equivalent transformations and modifications made within the scope of the claims of this application should fall within the coverage of the claims of this application.

Claims

1. A heat pump system, characterized in that, include: At least two indoor units, each indoor unit including a first refrigerant port and a second refrigerant port connected to the first refrigerant port; An outdoor unit, the outdoor unit including a first refrigerant pipeline, a second refrigerant pipeline, a refrigerant outlet pipeline and a refrigerant inlet pipeline; Trachea and fluid tubes; The first refrigerant pipeline is connected to the main interface end of the gas pipe; In each indoor unit, the first refrigerant port is connected to the corresponding branch end in the gas pipe, and the second refrigerant port is connected to the corresponding branch end in the liquid pipe. The second refrigerant line is connected to the main interface end of the liquid line; The refrigerant outlet pipe and the refrigerant inlet pipe are used to connect to an external domestic hot water module to produce hot water through heat exchange between the refrigerant and water; The liquid pipe and the gas pipe are also used to connect to an external hydraulic module to realize heat exchange between the refrigerant and water.

2. The heat pump system of claim 1, wherein, The heat pump system also includes the domestic hot water module, which includes a phase change heat exchanger filled with a phase change medium. The phase change heat exchanger includes a heat exchange refrigerant inlet, a heat exchange refrigerant outlet connected to the heat exchange refrigerant inlet, a third water inlet, and a third water outlet connected to the third water inlet. The heat exchange refrigerant inlet is connected to the refrigerant outlet pipeline, and the heat exchange refrigerant outlet is connected to the refrigerant inlet pipeline; The third water inlet is used to connect to external tap water, and the third water outlet is used to supply domestic hot water.

3. The heat pump system according to claim 2, characterized in that, The phase change heat exchanger includes a first pipe and a second pipe. The first pipe is connected between the heat exchange refrigerant inlet and the heat exchange refrigerant outlet, and the second pipe is connected between the third water inlet and the third water outlet. The first pipeline and the second pipeline are at least partially intertwined.

4. The heat pump system according to claim 1, characterized in that, The outdoor unit also includes: The first switching valve is located on the first refrigerant pipeline; The second switching valve is located on the second refrigerant pipeline; A third switching valve, wherein the third switching valve is located on the refrigerant outlet pipe; and... The fourth switching valve is located on the refrigerant inlet pipe.

5. The heat pump system of claim 1, wherein, The heat pump system further includes the domestic hot water module, which comprises: A domestic hot water heat exchanger includes a first refrigerant inlet, a first refrigerant outlet connected to the first refrigerant inlet, a first water inlet, and a first water outlet connected to the first water inlet. The first refrigerant inlet is connected to the refrigerant outlet pipeline, and the first refrigerant outlet is connected to the refrigerant inlet pipeline. The first domestic water tank is connected to the first water inlet and the first water outlet.

6. The heat pump system according to any one of claims 1 to 5, characterized in that, The heat pump system further includes at least one of the hydraulic modules, the hydraulic module comprising: A heat exchanger, the heat exchanger including a third refrigerant port, a fourth refrigerant port connected to the third refrigerant port, a second water inlet and a second water outlet connected to the second water inlet; The third refrigerant port is connected to the corresponding branch end in the gas pipe, and the fourth refrigerant port is connected to the corresponding branch end in the liquid pipe; the second water inlet and the second water outlet are used for external terminal connections.

7. The heat pump system of claim 1, wherein, The outdoor unit also includes: The compressor is used to compress refrigerant; A high-pressure gas-liquid separator includes a second refrigerant inlet, a second refrigerant outlet connected to the second refrigerant inlet, and a third refrigerant outlet connected to the second refrigerant inlet; the second refrigerant outlet is used to output gaseous refrigerant after gas-liquid separation, and the third refrigerant outlet is used to output liquid refrigerant after gas-liquid separation. An outdoor heat exchanger, the outdoor heat exchanger including a fifth refrigerant port and a sixth refrigerant port connected to the fifth refrigerant port; and, First throttling device; The compressor outlet is connected to the refrigerant outlet pipeline; The second refrigerant inlet is connected to the refrigerant inlet pipe; The second refrigerant outlet is connected to the first refrigerant pipeline and the fifth refrigerant port; The third refrigerant outlet is connected to the second refrigerant pipeline and the sixth refrigerant port via the first throttling device. The second refrigerant pipeline is connected to the sixth refrigerant port. The fifth refrigerant port and the first refrigerant pipeline are connected to the compressor inlet.

8. The heat pump system of claim 7, wherein, The outdoor unit also includes a fifth switching valve and a first reversing valve; The compressor outlet is connected to the refrigerant outlet pipeline via the fifth switching valve, and the compressor outlet is connected to the first refrigerant pipeline and the fifth refrigerant port via the first reversing valve. The second refrigerant outlet is connected to the first refrigerant pipeline and the fifth refrigerant port via the first reversing valve; Alternatively, the compressor outlet is connected to the refrigerant outlet pipeline via the first reversing valve, and the compressor outlet is connected to the first refrigerant pipeline and the fifth refrigerant port via the first reversing valve. The second refrigerant outlet is connected to the first refrigerant pipeline and the fifth refrigerant port via the fifth switching valve.

9. The heat pump system of claim 8, wherein, The first reversing valve includes a first valve port, a second valve port, and a third valve port; The first valve port is connected to the second refrigerant outlet, the second valve port is connected to the first refrigerant pipeline and the fifth refrigerant port, and the third valve port is connected to the compressor outlet. Alternatively, the first valve port is connected to the outlet of the compressor, the second valve port is connected to the refrigerant outlet pipeline, and the third valve port is connected to the first refrigerant pipeline and the fifth refrigerant port.

10. The heat pump system of claim 7, wherein, The outdoor unit also includes an economy module. The first end of the economic module is connected to the second refrigerant pipeline, the second end of the economic module is connected to the sixth refrigerant port, and the third refrigerant outlet is connected to the second end of the economic module via the first throttling device.

11. The heat pump system of claim 7, wherein, The outdoor unit also includes an economy module and a liquid storage container; The first interface of the liquid storage container is connected to the second refrigerant pipeline, and the third refrigerant outlet is connected to the second refrigerant pipeline via the first throttling device; the second interface of the liquid storage container is connected to the first end of the economy module, and the second end of the economy module is connected to the sixth refrigerant port.

12. The heat pump system of claim 7, wherein, The outdoor unit also includes a second reversing valve; The second refrigerant outlet is connected to the first refrigerant pipeline and the fifth refrigerant port via the second reversing valve; the fifth refrigerant port and the first refrigerant pipeline are connected to the compressor inlet via the second reversing valve.

13. A heat pump system, characterized by include: The compressor is used to compress refrigerant; A domestic hot water heat exchanger, the domestic hot water heat exchanger including a first refrigerant inlet and a first refrigerant outlet connected to the first refrigerant inlet; A high-pressure gas-liquid separator includes a second refrigerant inlet, a second refrigerant outlet connected to the second refrigerant inlet, and a third refrigerant outlet connected to the second refrigerant inlet; the second refrigerant outlet is used to output gaseous refrigerant after gas-liquid separation, and the third refrigerant outlet is used to output liquid refrigerant after gas-liquid separation. An outdoor heat exchanger, at least one indoor unit, a first reversing valve, a second reversing valve, and a fifth switching valve; The compressor outlet is connected to the first refrigerant inlet via the fifth switching valve, the first refrigerant outlet is connected to the second refrigerant inlet, the second refrigerant outlet is connected to the second refrigerant outlet via the first reversing valve, the second reversing valve is connected to the outdoor heat exchanger, the indoor unit and the compressor inlet, the third refrigerant outlet is connected to the indoor unit, and the outdoor heat exchanger is connected to the indoor unit. When refrigeration and domestic hot water production are operating simultaneously, the first reversing valve keeps the second refrigerant outlet connected to the second reversing valve, and when all the heat of the refrigerant is exchanged in the domestic hot water heat exchanger, the refrigerant forms a first flow path from the compressor outlet through the fifth switching valve, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, the third refrigerant outlet, the indoor unit, the second reversing valve, and the compressor inlet; When refrigeration and domestic hot water production are operating simultaneously, the first reversing valve keeps the second refrigerant outlet connected to the second reversing valve, and when part of the heat of the refrigerant is exchanged in the domestic hot water heat exchanger, the refrigerant forms a second flow path from the compressor outlet through the fifth switching valve, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, the second refrigerant outlet, the first reversing valve, the second reversing valve, the outdoor heat exchanger, the indoor unit, the second reversing valve, and the compressor inlet.

14. The heat pump system according to claim 13, characterized in that, The third refrigerant outlet is also connected to the outdoor heat exchanger; When heating and domestic hot water production are operating simultaneously, the first reversing valve keeps the second refrigerant outlet connected to the second reversing valve, and when part of the heat of the refrigerant is exchanged in the domestic hot water heat exchanger, the refrigerant forms a third flow path from the compressor outlet through the fifth switching valve, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, the second refrigerant outlet, the first reversing valve, the second reversing valve, the indoor unit, the outdoor heat exchanger, the second reversing valve, and the compressor inlet; When the domestic hot water system is operating independently, the first reversing valve keeps the second refrigerant outlet connected to the second reversing valve, and all the heat of the refrigerant is exchanged in the domestic hot water heat exchanger. The refrigerant forms a fourth flow path from the compressor outlet through the fifth switching valve, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, the third refrigerant outlet, the outdoor heat exchanger, the second reversing valve, and the compressor inlet.

15. The heat pump system of claim 13, wherein, The heat pump system also includes a heat recovery branch and a low-pressure gas-liquid separator. One end of the heat recovery branch is connected to the third refrigerant outlet, and the other end of the heat recovery branch is connected to the low-pressure gas-liquid separator.

16. The heat pump system of claim 15, wherein, At least a portion of the heat recovery branch is a capillary tube; and / or, at least a portion of the pipeline of the third refrigerant outlet is a capillary tube.

17. The heat pump system of claim 15, wherein, The heat pump system also includes: A branch valve is provided on the heat recovery branch.

18. A heat pump system, characterized in that, include: The compressor is used to compress refrigerant; A phase change heat exchanger, the phase change heat exchanger including a heat exchange refrigerant inlet and a heat exchange refrigerant outlet connected to the heat exchange refrigerant inlet; A high-pressure gas-liquid separator includes a second refrigerant inlet, a second refrigerant outlet connected to the second refrigerant inlet, and a third refrigerant outlet connected to the second refrigerant inlet; the second refrigerant outlet is used to output gaseous refrigerant after gas-liquid separation, and the third refrigerant outlet is used to output liquid refrigerant after gas-liquid separation. An outdoor heat exchanger, at least one indoor unit, a first reversing valve, a second reversing valve, and a fifth switching valve; The compressor outlet is connected to the heat exchange refrigerant inlet via the fifth switching valve, the heat exchange refrigerant outlet is connected to the second refrigerant inlet, the second refrigerant outlet is connected to the second refrigerant outlet via the first reversing valve, the second reversing valve is connected to the outdoor heat exchanger, the indoor unit and the compressor inlet, the third refrigerant outlet is connected to the indoor unit, and the outdoor heat exchanger is connected to the indoor unit. When cooling and domestic hot water production are running simultaneously, the first reversing valve keeps the second refrigerant outlet connected to the second refrigerant outlet, and when all the heat of the refrigerant is exchanged in the phase change heat exchanger, the refrigerant forms a first flow path from the compressor outlet through the fifth switching valve, the heat exchange refrigerant inlet, the heat exchange refrigerant outlet, the second refrigerant inlet, the third refrigerant outlet, the indoor unit, the second reversing valve, and the compressor inlet; When refrigeration and domestic hot water production are operating simultaneously, the first reversing valve keeps the second refrigerant outlet connected to the second reversing valve, and when part of the heat of the refrigerant is exchanged in the phase change heat exchanger, the refrigerant forms a second flow path from the compressor outlet through the fifth switching valve, the heat exchange refrigerant inlet, the heat exchange refrigerant outlet, the second refrigerant inlet, the second refrigerant outlet, the first reversing valve, the second reversing valve, the outdoor heat exchanger, the indoor unit, the second reversing valve, and the compressor inlet.

19. The heat pump system according to claim 18, characterized in that, The phase change heat exchanger is filled with a phase change medium; The phase change heat exchanger further includes a third water inlet and a third water outlet connected to the third water inlet; The third water inlet is used to connect to external tap water, and the third water outlet is used to supply domestic hot water.

20. The heat pump system according to claim 19, characterized in that, The phase change heat exchanger includes a first pipe and a second pipe. The first pipe is connected between the heat exchange refrigerant inlet and the heat exchange refrigerant outlet, and the second pipe is connected between the third water inlet and the third water outlet. The first pipeline and the second pipeline are at least partially intertwined.

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