Heat pump system

Abstract

The utility model discloses a heat pump system which comprises a compressor, an outdoor side heat exchanger, at least one indoor unit, at least one floor heating heat exchanger and first one-way valves arranged corresponding to the floor heating heat exchangers. The outdoor heat exchanger comprises a first refrigerant port and a second refrigerant port which communicate with each other, and the first refrigerant port is connected with an outlet and an inlet of the compressor. The indoor unit comprises a third refrigerant port and a fourth refrigerant port which communicate with each other, the third refrigerant port is connected with the second refrigerant port, and the fourth refrigerant port is connected with an outlet and an inlet of the compressor; the floor heating heat exchanger comprises a first refrigerant inlet and a first refrigerant outlet communicated with the first refrigerant inlet, the first refrigerant inlet is connected with an outlet of the compressor, the first refrigerant outlet is connected with the second refrigerant port through a first one-way valve, and the conduction direction of the first one-way valve faces the second refrigerant port. The utility model can thoroughly solve the problem that the floor heating heat exchanger is frozen when the heat pump system runs in a refrigeration mode.

Description

Technical Field

[0001] This utility model relates to the field of heat pump technology, and in particular to a heat pump system. Background Technology

[0002] In the case of a fluorinated water-based heat pump system, when the evaporation temperature is very low during cooling, the presence of water in the heat exchanger of the underfloor heating module can cause low-temperature refrigerant to enter the heat exchanger of the underfloor heating module during the summer when the indoor unit is used for cooling. This can lead to the heat exchanger of the underfloor heating module freezing and potentially breaking. Utility Model Content

[0003] The technical problem to be solved by this utility model is to address at least one defect in the related technologies mentioned in the background: when the heat pump system is cooling, the heat exchanger of the underfloor heating module may freeze and break. This utility model provides a heat pump system.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a heat pump system, including:

[0005] The compressor is used to compress refrigerant;

[0006] An outdoor heat exchanger includes a first refrigerant port and a second refrigerant port, the first refrigerant port being connected to the second refrigerant port, and the first refrigerant port being connected to the outlet and inlet of the compressor respectively;

[0007] At least one indoor unit, the indoor unit including a third refrigerant port and a fourth refrigerant port, the third refrigerant port being connected to the fourth refrigerant port, the third refrigerant port being connected to the second refrigerant port, and the fourth refrigerant port being connected to the outlet and inlet of the compressor respectively;

[0008] At least one underfloor heating heat exchanger and a first one-way valve corresponding to each of the underfloor heating heat exchangers. The underfloor heating heat exchanger includes a first refrigerant inlet and a first refrigerant outlet. The first refrigerant inlet is connected to the first refrigerant outlet and is connected to the outlet of the compressor. The first refrigerant outlet is connected to a second refrigerant port via the first one-way valve, and the conduction direction of the first one-way valve is towards the second refrigerant port.

[0009] In some embodiments, the heat pump system further includes:

[0010] The gas pipe and liquid pipe are connected together. The second refrigerant port is connected to the main interface end of the liquid pipe. The third refrigerant port and the first refrigerant outlet are respectively connected to the corresponding branch interfaces in the liquid pipe. The fourth refrigerant port and the first refrigerant inlet are respectively connected to the corresponding branch interfaces in the gas pipe. The main interface end of the gas pipe is connected to the outlet and inlet of the compressor.

[0011] In some embodiments, the heat pump system further includes:

[0012] The first throttling device is located on the pipeline between the first refrigerant outlet and the first check valve. The first throttling device is used to throttle the refrigerant output from the first refrigerant outlet.

[0013] And / or, corresponding to the second throttling device provided for each of the indoor units, the third refrigerant port is connected to the second refrigerant port via the second throttling device.

[0014] In some embodiments, when the heat pump system is operating in cooling mode, the first check valve is used to block refrigerant from flowing into the underfloor heating heat exchanger;

[0015] When the heat pump system is operating in heating mode, the refrigerant flows in from the first refrigerant inlet and flows out after passing through the first refrigerant outlet and the first one-way valve.

[0016] In some embodiments, the heat pump system further includes:

[0017] A heat recovery heat exchanger is used to realize heat exchange between refrigerant and heat storage medium for heat storage. The heat recovery heat exchanger includes a second refrigerant inlet and a second refrigerant outlet, and the second refrigerant inlet and the second refrigerant outlet are connected.

[0018] The compressor outlet is connected to the second refrigerant inlet, and the second refrigerant outlet is connected to at least one of the first refrigerant port, the fourth refrigerant port, and the pipeline between the second refrigerant port and the third refrigerant port.

[0019] In some embodiments, the heat pump system further includes:

[0020] The high-pressure gas-liquid separator is provided, and the second refrigerant outlet is connected to at least one of the first refrigerant port, the fourth refrigerant port, and the pipeline between the second refrigerant port and the third refrigerant port via the high-pressure gas-liquid separator.

[0021] In some embodiments, the high-pressure gas-liquid separator includes a third refrigerant inlet, a third refrigerant outlet, and a fourth refrigerant outlet;

[0022] The third refrigerant inlet is connected to the third refrigerant outlet and the fourth refrigerant outlet respectively. The third refrigerant outlet is used to output the liquid refrigerant after gas-liquid separation, and the fourth refrigerant outlet is used to output the gaseous refrigerant after gas-liquid separation.

[0023] The second refrigerant outlet is connected to the third refrigerant inlet, the third refrigerant outlet is connected to the pipeline between the second refrigerant port and the third refrigerant port, and the fourth refrigerant outlet is connected to the first refrigerant port and / or the fourth refrigerant port.

[0024] In some embodiments, the heat pump system further includes:

[0025] The system includes a heat recovery branch and a low-pressure gas-liquid separator. One of the third refrigerant outlets is connected to the pipeline between the second refrigerant port and the third refrigerant port. The other of the third refrigerant outlets is connected to the inlet of the low-pressure gas-liquid separator via the heat recovery branch. The outlet of the low-pressure gas-liquid separator is connected to the inlet of the compressor.

[0026] In some embodiments, the heat pump system further includes:

[0027] The first reversing valve connects the compressor outlet to the first refrigerant port and the fourth refrigerant port respectively, and the fourth refrigerant outlet connects to the first refrigerant port and / or the fourth refrigerant port through the first reversing valve.

[0028] In some embodiments, the heat pump system further includes:

[0029] The second reversing valve includes a fourth valve port, a fifth valve port, a sixth valve port, and a seventh valve port; the fourth valve port is connected to the outlet of the compressor, the fifth valve port is connected to the first refrigerant port, the sixth valve port is connected to the inlet of the compressor, and the seventh valve port is connected to the fourth refrigerant port.

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

[0031] This invention adds a first one-way valve to the first refrigerant outlet of the underfloor heating heat exchanger. The first one-way valve allows the refrigerant to flow from the first refrigerant outlet to the outdoor heat exchanger in the heating flow direction, and prohibits the refrigerant from flowing in the opposite direction. Therefore, when the heat pump system is running in cooling mode, due to the presence of the first one-way valve, the low-temperature refrigerant cannot enter the underfloor heating heat exchanger from the first refrigerant outlet, thereby completely solving the problem of the underfloor heating heat exchanger freezing and breaking when the heat pump system is running in cooling mode. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0033] Figure 1 This is a schematic diagram of the heat pump system of this utility model;

[0034] Figure 2 This is a schematic diagram of the refrigerant flow direction in the heat pump system of this utility model, which produces hot water through a total heat recovery mode while cooling.

[0035] Figure 3 This is a schematic diagram of the flow direction of the first refrigerant in the heat pump system of this utility model, which produces hot water through waste heat recovery while cooling.

[0036] Figure 4 This is a schematic diagram of the flow direction of the second refrigerant in the heat pump system of this utility model, which produces hot water through waste heat recovery while cooling.

[0037] Figure 5 This is a schematic diagram of the flow direction of the first refrigerant in the heat pump system of this utility model, which produces hot water while heating.

[0038] Figure 6 This is a schematic diagram showing the flow direction of the second refrigerant in the heat pump system of this utility model, which produces hot water while heating.

[0039] Figure 7 This is a schematic diagram of the refrigerant flow direction in the heat pump system of this utility model when it is purely preparing hot water;

[0040] Figure 8 This is a schematic diagram of the refrigerant flow direction during cooling in the heat pump system of this utility model;

[0041] Figure 9 This is a schematic diagram of the refrigerant flow direction during heating in the heat pump system of this utility model. Detailed Implementation

[0042] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0044] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "located in," and "located in" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections, mechanical connections or chemical connections, direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] It should be noted that, apart from the refrigerant flow relationship between the inlet and outlet connections, the connections between ports, between ports and components, or between components described below are merely physical structural connections and do not exclusively limit the connectivity or refrigerant flow relationship. Connections can be direct pipe connections or connections via other components. Furthermore, the orientation of the one-way valve mentioned below refers to the refrigerant flow direction, not the spatial orientation. The refrigerant described below includes Freon-based refrigerants or mixed environmentally friendly refrigerants, etc., without limitation, and can also be other types.

[0047] like Figure 1 As shown, some embodiments of this utility model disclose a heat pump system, including a compressor 11, an outdoor heat exchanger 12, at least one indoor unit 13, at least one underfloor heating heat exchanger 14, and a first one-way valve 15 corresponding to each of the underfloor heating heat exchangers 14. It can be understood that at least one unit can be one, two, three, or any number of units. The heat pump system is specifically as follows:

[0048] The compressor 11 is used to compress refrigerant, and the compressor 11 includes an inlet and an outlet.

[0049] The outdoor heat exchanger 12 is used to realize heat exchange between the refrigerant and the outside air. The outdoor heat exchanger 12 includes a first refrigerant port 121 and a second refrigerant port 122. The first refrigerant port 121 is connected to the second refrigerant port 122. The first refrigerant port 121 is connected to the outlet and inlet of the compressor 11 respectively.

[0050] The indoor unit 13 is used to realize heat exchange between refrigerant and indoor air. The indoor unit 13 includes a third refrigerant port 131 and a fourth refrigerant port 132. The third refrigerant port 131 is connected to the fourth refrigerant port 132. The third refrigerant port 131 is connected to the second refrigerant port 122. The fourth refrigerant port 132 is connected to the outlet and inlet of the compressor 11 respectively.

[0051] The underfloor heating heat exchanger 14 is used to realize heat exchange between refrigerant and heat storage medium for heat storage. The underfloor heating heat exchanger 14 includes a first refrigerant inlet 141 and a first refrigerant outlet 142. The first refrigerant inlet 141 is connected to the first refrigerant outlet 142. The first refrigerant inlet 141 is connected to the outlet of the compressor 11. The first refrigerant outlet 142 is connected to the second refrigerant port 122 via the first one-way valve 15. The conduction direction of the first one-way valve 15 is towards the second refrigerant port 122.

[0052] For example, the outdoor heat exchanger 12 is a finned heat exchanger. The indoor unit 13 is a ducted air conditioner, which includes an indoor heat exchanger (such as a finned heat exchanger) and a fan. The underfloor heating heat exchanger 14 is a plate heat exchanger. The finned heat exchanger, the ducted air conditioner, and the plate heat exchanger mentioned here are merely examples and are not intended to limit this application; other types may also be used.

[0053] In this embodiment, a first one-way valve 15 is added to the first refrigerant outlet 142 of the underfloor heating heat exchanger 14. The first one-way valve 15 allows refrigerant to flow from the first refrigerant outlet 142 to the outdoor heat exchanger 12 in the heating flow direction, and prohibits refrigerant from flowing in the opposite direction. Therefore, when the heat pump system is operating in cooling mode, due to the presence of the first one-way valve 15, low-temperature refrigerant cannot enter the underfloor heating heat exchanger 14 from the first refrigerant outlet 142, thereby completely solving the problem of the underfloor heating heat exchanger 14 freezing and breaking when the heat pump system is operating in cooling mode. Therefore, when the heat pump system is operating in cooling mode, the first one-way valve 15 is used to block refrigerant from flowing into the underfloor heating heat exchanger 14. When the heat pump system is operating in heating mode, refrigerant flows in from the first refrigerant inlet 141 and flows out after passing through the first refrigerant outlet 142 and the first one-way valve 15.

[0054] In some embodiments, such as Figure 1As shown, the heat pump system further includes a gas pipe 16 and a liquid pipe 17. The second refrigerant port 122 is connected to the main interface end of the liquid pipe 17. The third refrigerant port 131 and the first refrigerant outlet 142 are respectively connected to the corresponding branch interfaces in the liquid pipe 17. The fourth refrigerant port 132 and the first refrigerant inlet 141 are respectively connected to the corresponding branch interfaces in the gas pipe 16. The main interface end of the gas pipe 16 is respectively connected to the outlet and inlet of the compressor 11.

[0055] In some embodiments, such as Figure 1 As shown, the heat pump system further includes a first throttling device 18 and / or a second throttling device 40 corresponding to each indoor unit 13. The first throttling device 18 is located on the pipeline between the first refrigerant outlet 142 and the first one-way valve 15, and is used to throttle the refrigerant output from the first refrigerant outlet 142. The third refrigerant port 131 is connected to the second refrigerant port 122 via the second throttling device 40. For example, the first throttling device 18 and the second throttling device 40 are respectively electronic expansion valves or thermostatic expansion valves. The electronic expansion valve and the thermostatic expansion valve mentioned here are merely examples and are not intended to limit this application; others may also be used.

[0056] In some embodiments, such as Figure 1 As shown, the underfloor heating heat exchanger 14 further includes a first water inlet 143 and a first water outlet 144, with the first water inlet 143 and the first water outlet 144 connected together. The heat pump system also includes a terminal 19, which is connected to both the first water inlet 143 and the first water outlet 144. Specifically, the terminal 19 includes a first water outlet 191 and a first water return outlet 192, with the first water outlet 191 connected to the first water inlet 143 and the first water outlet 144 connected to the first water return outlet 192. For example, the terminal 19 may be a ground pipe, achieving underfloor heating through heat exchange with the heat exchanger. If the ground pipe has multiple outlets, the terminal 19 may also be equipped with a manifold. The ground pipe mentioned here is merely an example and is not intended to limit this application; other types are also possible.

[0057] In some embodiments, such as Figure 1 As shown, the heat pump system further includes a first water pump 20, which is installed in the inlet pipe (i.e., the pipe connecting the first outlet 191 and the first water inlet 143) or the outlet pipe (i.e., the pipe connecting the first water outlet 144 and the first return water inlet 192) of the terminal 19. The first water pump 20 is used to provide power for the water circulation between the underfloor heating heat exchanger 14 and the terminal 19.

[0058] In some embodiments, such as Figure 1 As shown, the underfloor heating heat exchanger 14, the first one-way valve 15, the first throttling device 18, and the first water pump 20 can be integrated into a hydraulic module, which the user can install on the gas pipe 16 and the liquid pipe 17 according to their needs. Furthermore, the indoor unit 13 and the hydraulic module can operate independently or simultaneously.

[0059] In some embodiments, such as Figure 1 As shown, the heat pump system further includes a heat recovery heat exchanger 21, which is used to realize heat exchange between the refrigerant and the heat storage medium for heat storage. In some embodiments, it is used to realize heat exchange between the refrigerant and water to produce domestic hot water. In other embodiments, the heat recovery heat exchanger 21 is a heat storage device with heat storage material. For example, the heat recovery heat exchanger 21 is a shell-and-tube heat exchanger. The shell-and-tube heat exchanger mentioned here is only an example and is not intended to limit this application; other types are also possible.

[0060] The heat recovery heat exchanger 21 includes a second refrigerant inlet 211 and a second refrigerant outlet 212, with the second refrigerant inlet 211 and the second refrigerant outlet 212 connected. The outlet of the compressor 11 is connected to the second refrigerant inlet 211, and the second refrigerant outlet 212 is connected to at least one of the following: the first refrigerant port 121, the fourth refrigerant port 132, and the pipeline between the second refrigerant port 122 and the third refrigerant port 131. It can be understood that at least one can be one, two, or three.

[0061] In some embodiments, such as Figure 1 As shown, the heat recovery heat exchanger 21 further includes a second water inlet 213 and a second water outlet 214, with the second water inlet 213 and the second water outlet 214 connected together. The heat pump system also includes a domestic water tank 22, which includes a cold water inlet 221, a second water outlet 222, a second water return outlet 223, and a hot water outlet 224. The second water outlet 222 is connected to the second water inlet 213, and the second water outlet 214 is connected to the second water return outlet 223.

[0062] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a second water pump 23, which is installed in the inlet pipe (i.e., the pipe connecting the second outlet 222 and the second water inlet 213) or the outlet pipe (i.e., the pipe connecting the second water outlet 214 and the second return water inlet 223) of the heat recovery heat exchanger 21. The second water pump 23 is used to provide power for the water circulation between the heat recovery heat exchanger 21 and the domestic water tank 22.

[0063] In some embodiments, such as Figure 1 As shown, the heat recovery heat exchanger 21, the domestic water tank 22 and the second water pump 23 can be integrated into a domestic hot water module, which can be assembled by the user according to actual needs.

[0064] In some embodiments, such as Figure 1 As shown, the heat pump system further includes a high-pressure gas-liquid separator 24, which is used to separate gaseous refrigerant and liquid refrigerant. The second refrigerant outlet 212 is connected to at least one of the first refrigerant port 121, the fourth refrigerant port 132, and the pipeline between the second refrigerant port 122 and the third refrigerant port 131 through the high-pressure gas-liquid separator 24.

[0065] In this embodiment, the gas-liquid separation of the high-pressure gas-liquid separator 24 enables automatic refrigerant flow when switching between modes, thereby improving the stability of the system.

[0066] In some embodiments, such as Figure 1 As shown, the high-pressure gas-liquid separator 24 includes a third refrigerant inlet 241, a third refrigerant outlet 242, and a fourth refrigerant outlet 243. The third refrigerant inlet 241 is connected to both the third refrigerant outlet 242 and the fourth refrigerant outlet 243. The third refrigerant outlet 242 is used to output the liquid refrigerant after gas-liquid separation, and the fourth refrigerant outlet 243 is used to output the gaseous refrigerant after gas-liquid separation.

[0067] The second refrigerant outlet 212 is connected to the third refrigerant inlet 241, the third refrigerant outlet 242 is connected to the pipeline between the second refrigerant port 122 and the third refrigerant port 131, and the fourth refrigerant outlet 243 is connected to the first refrigerant port 121 and / or the fourth refrigerant port 132.

[0068] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a heat recovery branch 25 and a low-pressure gas-liquid separator 26, which is used to separate gaseous refrigerant and liquid refrigerant. One branch of the third refrigerant outlet 242 is connected to the pipeline between the second refrigerant port 122 and the third refrigerant port 131, outputting the separated liquid refrigerant. The other branch of the third refrigerant outlet 242 is connected to the inlet of the low-pressure gas-liquid separator 26 via the heat recovery branch 25, and the outlet of the low-pressure gas-liquid separator 26 is connected to the inlet of the compressor 11.

[0069] In this embodiment, a heat recovery branch 25 is provided between the third refrigerant outlet 242 of the high-pressure gas-liquid separator 24 and the inlet of the low-pressure gas-liquid separator 26. The heat recovery branch 25 can realize the return of oil accumulated in the high-pressure gas-liquid separator 24, and release the refrigerant that has migrated into the high-pressure gas-liquid separator 24 to relieve pressure, thereby improving the pressure balance of the system.

[0070] When the heat pump system includes the heat recovery heat exchanger 21, the system has multiple operating modes (see below for details). The high-pressure gas-liquid separator 24 can realize the automatic flow of refrigerant when switching between modes (mainly the cooling and total heat recovery domestic hot water mode and the cooling and waste heat recovery domestic hot water mode), thereby improving the stability of the system. However, oil accumulation and refrigerant migration problems are prone to occur in the high-pressure gas-liquid separator 24. Therefore, in the triple heat pump system with the heat recovery heat exchanger 21 and the high-pressure gas-liquid separator 24, adding the heat recovery branch 25 is crucial for the oil return and pressure stability of the triple heat pump system.

[0071] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a branch valve 27, which is located on the heat recovery branch 25. Depending on the system operation, the branch valve 27 is opened to return oil or adjust the system pressure balance. For example, the branch valve 27 is a solenoid valve; however, this solenoid valve is merely an example and not intended to limit the scope of this application, and other types may also be used.

[0072] It should be noted that the branch valve 27 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, the branch valve 27 can be opened according to the system conditions, such as refrigerant migration, system pressure, and the oil return requirements of the compressor 11.

[0073] In some embodiments, such as Figure 1 As shown, at least a portion of the heat recovery branch 25 is a capillary tube, i.e. Figure 1 As shown in Figure 251, 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 26, preventing excessive refrigerant leakage into the low-pressure gas-liquid separator 26 after the branch valve 27 is opened. And / or, in some other embodiments, at least a portion of the pipeline of the third refrigerant outlet 242 is a capillary tube, i.e. Figure 1 As shown in 45. Understandably, at least part can be partial or all.

[0074] In some embodiments, the heat pump system further includes a filter (not shown) located on the third refrigerant outlet 242, the filter being used to filter impurities, absorb moisture, and prevent clogging.

[0075] In some embodiments, such as Figure 1 As shown, the heat pump system further includes a first reversing valve 28. The outlet of the compressor 11 is connected to the first refrigerant port 121 and the fourth refrigerant port 132 through the first reversing valve 28. The fourth refrigerant outlet 243 is connected to the first refrigerant port 121 and / or the fourth refrigerant port 132 through the first reversing valve 28.

[0076] The first reversing valve 28 includes a first valve port 281, a second valve port 282, and a third valve port 283. The first valve port 281 is connected to the fourth refrigerant outlet 243, the second valve port 282 is connected to the first refrigerant port 121 and / or the fourth refrigerant port 132, and the third valve port 283 is connected to the outlet of the compressor 11. For example, the first reversing valve 28 is a three-way valve. The three-way valve mentioned here is only an example and is not intended to limit this application; other valves are also possible.

[0077] When 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 281 is connected to the second valve port 282, that is, the fourth refrigerant outlet 243 is connected to the first refrigerant port 121 or the fourth refrigerant port 132.

[0078] In cooling and heating modes, the third valve port 283 is connected to the second valve port 282, meaning the outlet of the compressor 11 is connected to either the first refrigerant port 121 or the fourth refrigerant port 132. Understandably, when it is necessary to regulate the amount of refrigerant entering the heat recovery heat exchanger 21 in cooling and waste heat recovery domestic hot water production modes, or heating and domestic hot water production modes, the third valve port 283 can also be connected to the second valve port 282.

[0079] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a first switching valve 29. One outlet of the compressor 11 is connected to the second refrigerant inlet 211 via the first switching valve 29, and the other outlet of the compressor 11 is connected to the first refrigerant port 121 and the fourth refrigerant port 132 respectively (specifically connected to the third valve port 283 of the first reversing valve 28). When hot water needs to be prepared, the first switching valve 29 can be opened. For example, the first switching valve 29 is a two-way valve. The two-way valve mentioned here is only an example and is not intended to limit this application; other valves are also possible.

[0080] In some embodiments, such as Figure 1 As shown, the heat pump system further includes a second reversing valve 30. The outlet of the compressor 11 is connected to the first refrigerant port 121 and the fourth refrigerant port 132 via the first reversing valve 28 and the second reversing valve 30, respectively. The inlet of the compressor 11 is connected to the first refrigerant port 121 and the fourth refrigerant port 132 via the second reversing valve 30, respectively. The second refrigerant outlet 212 is connected to the first refrigerant port 121 and the fourth refrigerant port 132 via the third refrigerant inlet 241, the fourth refrigerant outlet 243, the first reversing valve 28, and the second reversing valve 30, respectively.

[0081] The second reversing valve 30 includes a fourth valve port 301, a fifth valve port 302, a sixth valve port 303, and a seventh valve port 304. The fourth valve port 301 is connected to the outlet of the compressor 11 (specifically, the second valve port 282 of the first reversing valve 28), the fifth valve port 302 is connected to the first refrigerant port 121, the sixth valve port 303 is connected to the inlet of the compressor 11, and the seventh valve port 304 is connected to the fourth refrigerant port 132. For example, the second reversing valve 30 is a four-way valve. The four-way valve mentioned here is only an example and is not intended to limit this application; other valves are also possible.

[0082] When the domestic hot water is in cooling and total heat recovery mode, the seventh valve port 304 is connected to the sixth valve port 303.

[0083] When in cooling and waste heat recovery domestic hot water mode and in cooling mode, the fourth valve port 301 is connected to the fifth valve port 302, and the seventh valve port 304 is connected to the sixth valve port 303.

[0084] When in heating plus domestic hot water mode and in heating mode, the fourth valve port 301 is connected to the seventh valve port 304, and the fifth valve port 302 is connected to the sixth valve port 303.

[0085] When in pure hot water mode, the fifth valve port 302 is connected to the sixth valve port 303.

[0086] In some embodiments, such as Figure 1As shown, the heat pump system further includes a third throttling device 31, through which the second refrigerant outlet 212 (specifically the third refrigerant outlet 242) is connected to the pipeline between the second refrigerant port 122 and the third refrigerant port 131. For example, the third throttling device 31 is an electronic expansion valve or a thermal expansion valve. The electronic expansion valve and the thermal expansion valve mentioned here are merely examples and are not intended to limit this application; other types are also possible.

[0087] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a fourth throttling device 32 and a heat exchanger 33, the heat exchanger 33 including a fifth refrigerant port 331, a sixth refrigerant port 332, a seventh refrigerant port 333 and an eighth refrigerant port 334.

[0088] The fifth refrigerant port 331 is connected to the sixth refrigerant port 332 to form an enthalpy-increasing main path. One end of the fourth throttling device 32 is connected to the pipeline between the third refrigerant port 131 and the fifth refrigerant port 331, and the other end of the fourth throttling device 32 is connected to the eighth refrigerant port 334 via the seventh refrigerant port 333 to form an enthalpy-increasing auxiliary path. The eighth refrigerant port 334 is connected to the inlet of the compressor 11.

[0089] The heat pump system of this embodiment, by setting the heat exchanger 33 and the fourth throttling device 32 at the outlet of the outdoor heat exchanger 12, allows the refrigerant from the outdoor heat exchanger 12 to enter the indoor unit 13 via the enthalpy-increasing main path (i.e., the sixth refrigerant port 332 and the fifth refrigerant port 331), and the other path to enter the inlet of the compressor 11 via the enthalpy-increasing auxiliary path (i.e., the fourth throttling device 32, the seventh refrigerant port 333 and the eighth refrigerant port 334). After the refrigerant is throttled and cooled by the fourth throttling device 32 in the enthalpy-increasing auxiliary path, it can more efficiently absorb the heat from the refrigerant in the enthalpy-increasing main path in the heat exchanger 33. After absorbing heat, the refrigerant vaporizes and enters the inlet of the compressor 11. At the same time, the subcooling degree of the refrigerant after releasing heat in the enthalpy-increasing main path is increased, and the temperature of the refrigerant entering the indoor unit 13 is lower, thereby improving the cooling effect in summer.

[0090] For example, the fourth throttling device 32 is an electronic expansion valve or a thermal expansion valve. The electronic expansion valve and the thermal expansion valve mentioned here are just examples and are not intended to limit this application. Other types are also possible.

[0091] In some embodiments, the third refrigerant port 131 is connected to one end of the fifth refrigerant port 331 and the fourth throttling device 32 via the second throttling device 40. After the refrigerant releases heat through the enthalpy-increasing main circuit, the subcooling degree is increased, and the temperature of the refrigerant entering the indoor unit 13 is lower, thereby reducing the throttling noise of the second throttling device 40 during summer cooling.

[0092] In some embodiments, the heat pump system further includes a second switching valve 34 and a third switching valve 35, with one path of the eighth refrigerant port 334 connected to the inlet of the compressor 11 via the second switching valve 34, and the other path of the eighth refrigerant port 334 connected to the enthalpy-increasing port 111 of the compressor 11 via the third switching valve 35.

[0093] For example, the second switching valve 34 and the third switching valve 35 are solenoid valves. The solenoid valves mentioned here are just examples and are not intended to limit this application. They can also be other types.

[0094] The heat pump system of this embodiment, by setting the heat exchanger 33 and the fourth throttling device 32 at the outlet of the indoor unit 13, allows the refrigerant from the indoor unit 13 to enter the outdoor heat exchanger 12 through the enthalpy-increasing main path (i.e., the fifth refrigerant port 331 and the sixth refrigerant port 332), and through the enthalpy-increasing auxiliary path (i.e., the fourth throttling device 32, the seventh refrigerant port 333 and the eighth refrigerant port 334) into the enthalpy-increasing port 111 of the compressor 11. After the refrigerant is throttled and cooled by the fourth throttling device 32 in the enthalpy-increasing auxiliary path, it can more efficiently absorb the heat from the refrigerant in the enthalpy-increasing main path in the heat exchanger 33. After absorbing heat, the refrigerant vaporizes and enters the enthalpy-increasing port 111 of the compressor 11, thereby improving the performance of the compressor 11. Meanwhile, the subcooling of the refrigerant after the heat release through the enthalpy-increasing main circuit is increased, and the temperature of the refrigerant entering the outdoor heat exchanger 12 is lower. Especially in cold winters, the temperature of the refrigerant can be lower than the outdoor temperature, thereby improving the heat absorption performance of the outdoor heat exchanger 12 in low-temperature environments and enhancing the subsequent heating effect.

[0095] In some embodiments, under the cooling and total heat recovery domestic hot water production mode, the refrigerant exiting the compressor 11 passes through the second refrigerant inlet 211, the second refrigerant outlet 212, the third refrigerant inlet 241, the third refrigerant outlet 242, and the enthalpy-increasing main path, and then splits into two paths. One path returns to the compressor 11 inlet via the third refrigerant port 131 and the fourth refrigerant port 132, while the other path returns to the compressor 11 inlet via the enthalpy-increasing auxiliary path and the second switching valve 34. Simultaneously, all the heat of the refrigerant is exchanged in the heat recovery heat exchanger 21.

[0096] In the cooling and waste heat recovery mode for domestic hot water production, the refrigerant exiting the compressor 11 passes through the second refrigerant inlet 211, the second refrigerant outlet 212, the third refrigerant inlet 241, the fourth refrigerant outlet 243, the first refrigerant port 121, the second refrigerant port 122, and the enthalpy-increasing main path, and then splits into two paths. One path returns to the compressor 11 inlet via the third refrigerant port 131 and the fourth refrigerant port 132, while the other path returns to the compressor 11 inlet via the enthalpy-increasing auxiliary path and the second switching valve 34. Simultaneously, some of the heat from the refrigerant is exchanged in the heat recovery heat exchanger 21.

[0097] In the heating and domestic hot water mode, the refrigerant exiting the compressor 11 passes through the second refrigerant inlet 211, the second refrigerant outlet 212, the third refrigerant inlet 241, the fourth refrigerant outlet 243, the fourth refrigerant port 132, and the third refrigerant port 131, and then splits into two paths. One path passes through the enthalpy-increasing main path, the second refrigerant port 122, and the first refrigerant port 121, and then returns to the compressor 11 inlet. The other path passes through the enthalpy-increasing auxiliary path and the third switching valve 35, and then returns to the enthalpy-increasing port 111 of the compressor 11. At the same time, part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger 21.

[0098] In cooling mode, the refrigerant exits from the compressor 11 and splits into two paths after passing through the first refrigerant port 121, the second refrigerant port 122, and the enthalpy-increasing main path. One path returns to the inlet of the compressor 11 via the third refrigerant port 131 and the fourth refrigerant port 132, while the other path returns to the inlet of the compressor 11 via the enthalpy-increasing auxiliary path and the second switching valve 34.

[0099] In heating mode, the refrigerant exits from the compressor 11 and splits into two paths after passing through the fourth refrigerant port 132 and the third refrigerant port 131. One path passes through the enthalpy-increasing main path, the second refrigerant port 122 and the first refrigerant port 121 and returns to the inlet of the compressor 11. The other path passes through the enthalpy-increasing auxiliary path and the third switching valve 35 and returns to the enthalpy-increasing port 111 of the compressor 11.

[0100] It should be noted that "all the heat is exchanged in the heat recovery heat exchanger 21" means that the refrigerant is completely formed into liquid refrigerant after heat exchange in the heat recovery heat exchanger 21, while "partial heat is exchanged in the heat recovery heat exchanger 21" means that the refrigerant is formed into gaseous refrigerant after heat exchange in the heat recovery heat exchanger 21.

[0101] In some embodiments, such as Figure 1As shown, the heat pump system further includes a fifth throttling device 36, through which the second refrigerant port 122 is connected to the third refrigerant port 131 (specifically, the sixth refrigerant port 332). For example, the fifth throttling device 36 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.

[0102] The temperature of the refrigerant entering the outdoor heat exchanger 12 can be further reduced by the fifth throttling device 36.

[0103] Furthermore, the heat pump system also includes a second one-way valve 37. One path of the second refrigerant port 122 is connected to the third refrigerant port 131 (specifically, the sixth refrigerant port 332) via the fifth throttling device 36. The other path of the second refrigerant port 122 is connected to the third refrigerant port 131 (specifically, the sixth refrigerant port 332) via the second one-way valve 37. The conduction direction of the second one-way valve 37 is towards the third refrigerant port 131. It should be noted that the orientation of the second one-way valve 37 refers to the direction of refrigerant flow, not its spatial orientation.

[0104] In some embodiments, such as Figure 1 As shown, the heat pump system also includes an oil separator 38 and an oil return pipe 39. The oil separator 38 is located at the outlet end of the compressor 11. The oil separator 38 is used to separate the lubricating oil from the compressor 11 mixed in the refrigerant and return it to the compressor 11 through the oil return pipe 39.

[0105] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a fresh air module (not shown in the figure), which is provided for each indoor unit 13 and is used to introduce fresh outdoor air and exhaust stale indoor air.

[0106] In some embodiments, such as Figure 1As shown, the heat pump system further includes a fourth switching valve 41, a fifth switching valve 42, a sixth switching valve 43, and a seventh switching valve 44. The fourth switching valve 41 is located on the pipeline between the first switching valve 29 and the second refrigerant inlet 211. The fifth switching valve 42 is located on the pipeline between the second refrigerant outlet 212 and the third refrigerant inlet 241. One end of the sixth switching valve 43 is connected to the second refrigerant port 122, and the other end is connected to the third refrigerant port 131 and the outlet of the first one-way valve 15. Specifically, one end of the sixth switching valve 43 is connected to the fifth refrigerant port 331 and one end of the fourth throttling device 32, and the other end is connected to the main interface of the liquid pipe 17. One end of the seventh switching valve 44 is connected to the outlet and inlet of the compressor 11, and the other end of the seventh switching valve 44 is connected to the fourth refrigerant port 132 and the first refrigerant inlet 141 respectively. Specifically, one end of the seventh switching valve 44 is connected to the seventh valve port 304 of the second reversing valve, and the other end of the seventh switching valve 44 is connected to the main interface end of the gas pipe 16.

[0107] For example, the fourth switching valve 41, the fifth switching valve 42, the sixth switching valve 43 and the seventh switching valve 44 are shut-off valves. The shut-off valves mentioned here are just examples and are not intended to limit this application. They can also be other types.

[0108] In some embodiments, such as Figure 1 As shown, the compressor 11, the outdoor heat exchanger 12, the high-pressure gas-liquid separator 24, the low-pressure gas-liquid separator 26, the first reversing valve 28, the first switching valve 29, the second reversing valve 30, the third throttling device 31, the fourth throttling device 32, the heat exchanger 33, the second switching valve 34, the third switching valve 35, the fifth throttling device 36, the second one-way valve 37, the oil separator 38, the oil return pipe 39, the fourth switching valve 41, the fifth switching valve 42, the sixth switching valve 43, and the seventh switching valve 44 are all integrated into the outdoor unit. It can be understood that at least one of the fourth switching valve 41, the fifth switching valve 42, the sixth switching valve 43, and the seventh switching valve 44 can be located inside or on the outer surface of the outdoor unit.

[0109] Completely, in some embodiments, such as Figure 1 As shown, the connection relationships between the components in the heat pump system are as follows:

[0110] One outlet of the compressor 11 is connected to the second refrigerant inlet 211 of the heat recovery heat exchanger 21 via the first switching valve 29 and the fourth switching valve 41. The other outlet of the compressor 11 is connected to the third valve port 283 of the first reversing valve 28. The second refrigerant outlet 212 of the heat recovery heat exchanger 21 is connected to the third refrigerant inlet 241 of the high-pressure gas-liquid separator 24 via the fifth switching valve 42. The fourth refrigerant outlet 243 of the high-pressure gas-liquid separator 24 is connected to the first valve port 281 of the first reversing valve 28. One outlet 242 of the high-pressure gas-liquid separator 24 is connected to the sixth refrigerant port 332 of the heat exchanger 33 via the third throttling device 31. The other outlet 242 of the high-pressure gas-liquid separator 24 is connected to the inlet of the low-pressure gas-liquid separator 26 via the heat recovery branch 25. The second valve port 282 of the first reversing valve 28 is connected to the fourth valve port 301 of the second reversing valve 30. The fifth valve port 302 of the second reversing valve 30 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12. The sixth valve port 303 of the second reversing valve 30 is connected to the inlet of the low-pressure gas-liquid separator 26, and the outlet of the low-pressure gas-liquid separator 26 is connected to the inlet of the compressor 11. The seventh valve port 304 of the second reversing valve 30 is connected to the main interface of the gas pipe 16 via the seventh switching valve 44. The main interface of the liquid pipe 17 is connected, via the sixth switching valve 43, one path to the fifth refrigerant port 331 of the heat exchanger 33, and the other path of the main interface of the liquid pipe 17 is connected via the fourth throttling device 32 to the seventh refrigerant port 333 of the heat exchanger 33. The sixth refrigerant port 332 of the heat exchanger 33 is connected to the second refrigerant port 122 of the outdoor heat exchanger 12 via the fifth throttling device 36, and the other end of the sixth refrigerant port 332 is connected to the second refrigerant port 122 of the outdoor heat exchanger 12 via the second one-way valve 37, with the second one-way valve 37 oriented towards the sixth refrigerant port 332 of the heat exchanger 33. The eighth refrigerant port 334 of the heat exchanger 33 is connected to the inlet of the low-pressure gas-liquid separator 26 via the second switching valve 34, and the other end of the eighth refrigerant port 334 is connected to the enthalpy-increasing port 111 of the compressor 11 via the third switching valve 35.

[0111] The second outlet 222 of the domestic water tank 22 is connected to the second water inlet 213 of the heat recovery heat exchanger 21 via the second water pump 23, and the second water outlet 214 of the heat recovery heat exchanger 21 is connected to the second return water inlet 223 of the domestic water tank 22.

[0112] The fourth refrigerant port 132 of the indoor unit 13 is connected to the corresponding branch port in the gas pipe 16, and the third refrigerant port 131 of the indoor unit 13 is connected to the corresponding branch port in the liquid pipe 17 via the second throttling device 40.

[0113] The first refrigerant inlet 141 of the underfloor heating heat exchanger 14 is connected to the corresponding branch end of the gas pipe 16. The first refrigerant outlet 142 of the underfloor heating heat exchanger 14 is connected to the corresponding branch end of the liquid pipe 17 via the first throttling device 18 and the first one-way valve 15, with the first one-way valve 15 facing the liquid pipe 17. The first water outlet 191 of the terminal 19 is connected to the first water inlet 143 of the underfloor heating heat exchanger 14 via the first water pump 20, and the first water outlet 144 of the underfloor heating heat exchanger 14 is connected to the first return water outlet 192 of the terminal 19.

[0114] Under different circumstances, the heat pump system will be connected to different valve ports, which will be described below. Figure 1 The diagram illustrates the refrigerant flow in various modes of the heat pump system. The modes are related by an OR condition. It should be noted that components not explicitly marked as "on" are considered "off," as detailed below:

[0115] like Figure 2As shown, in the cooling and total heat recovery domestic hot water mode, the third throttling device 31, the second throttling device 40, the first switching valve 29, the second switching valve 34, the fourth switching valve 41, the fifth switching valve 42, the sixth switching valve 43, and the seventh switching valve 44 are open. The first valve port 281 of the first reversing valve 28 is connected to or not connected to the second valve port 282. The seventh valve port 304 of the second reversing valve 30 is connected to the sixth valve port 303. That is, when hot water needs to be prepared quickly in cooling mode, the high-temperature gaseous refrigerant output from the compressor 11 enters the second refrigerant inlet 211 of the heat recovery heat exchanger 21 after passing through the first switching valve 29 and the fourth switching valve 41. The high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 22 in the heat recovery heat exchanger 21, and becomes a medium-temperature liquid refrigerant after preparing hot water. The medium-temperature liquid refrigerant output from the second refrigerant outlet 212 of the heat recovery heat exchanger 21 enters the third refrigerant inlet 241 of the high-pressure gas-liquid separator 24 through the fifth switching valve 42, and undergoes further gas-liquid separation in the high-pressure gas-liquid separator 24 to ensure that the refrigerant output from the third refrigerant outlet 242 is pure liquid. The medium-temperature liquid refrigerant output from the third refrigerant outlet 242 is throttled and cooled by the third throttling device 31, becoming a lower-temperature liquid refrigerant, and then enters the enthalpy-increasing main circuit (i.e., the sixth refrigerant port 332 and the fifth refrigerant port 331). One path of the low-temperature liquid refrigerant output from the enthalpy-increasing main circuit enters the liquid pipe 17 via the sixth switching valve 43, and the other path of the low-temperature liquid refrigerant output from the enthalpy-increasing main circuit of the heat exchanger 33 enters the enthalpy-increasing auxiliary circuit (i.e.... The fourth throttling device 32, the seventh refrigerant port 333, and the sixth refrigerant port 332) allow the low-temperature liquid refrigerant to be throttled and cooled in the enthalpy-increasing auxiliary circuit. After this cooling, the refrigerant can absorb heat from the main enthalpy-increasing circuit more efficiently in the heat exchanger 33, becoming a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the enthalpy-increasing auxiliary circuit returns to the inlet of the compressor 11 after passing through the second switching valve 34 and the low-pressure gas-liquid separator 26. The low-temperature liquid refrigerant in the enthalpy-increasing main circuit is cooled down by heat exchange and becomes an even lower-temperature liquid refrigerant. The low-temperature liquid refrigerant enters the second throttling device 40 in the liquid pipe 17. After being throttled and cooled by the second throttling device 40, it becomes an even lower-temperature liquid refrigerant and then enters the third refrigerant port 131 of the indoor unit 13. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 13. After absorbing the heat from the indoor air, the low-temperature liquid refrigerant evaporates and becomes a low-temperature gaseous refrigerant. The indoor unit 13 blows out cold air, and the low-temperature gaseous refrigerant output from the fourth refrigerant port 132 of the indoor unit 13 enters the gas pipe 16.The low-temperature gaseous refrigerant output from the gas pipe 16 passes through the seventh switching valve 44, the seventh valve port 304 and the sixth valve port 303 of the second reversing valve 30, and the low-pressure gas-liquid separator 26 before returning to the inlet of the compressor 11, in a reciprocating cycle.

[0116] The heat recovery heat exchanger 21 is connected to the domestic water tank 22, so that all the condensation heat originally used by the outdoor heat exchanger 12 for heat exchange with the air can be recovered and reused during cooling, avoiding the waste of heat when the outdoor heat exchanger 12 exchanges heat with the air. The recovered heat is exchanged with the water in the domestic water tank 22 in the heat recovery heat exchanger 21 to quickly produce hot water, improve energy utilization, and increase the speed of hot water production.

[0117] like Figure 3As shown, when the domestic hot water reaches a certain temperature, it can be switched to a cooling and waste heat recovery domestic hot water mode. In the cooling and waste heat recovery domestic hot water mode, the second throttling device 40, the first switching valve 29, the second switching valve 34, the fourth switching valve 41, the fifth switching valve 42, the sixth switching valve 43, and the seventh switching valve 44 are opened. The first valve port 281 of the first reversing valve 28 is connected to the second valve port 282. The fourth valve port 301 of the second reversing valve 30 is connected to the fifth valve port 302. The seventh valve port 304 of the second reversing valve 30 is connected to the sixth valve port 303. That is, when hot water needs to be prepared in cooling mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the second refrigerant inlet 211 of the heat recovery heat exchanger 21 after passing through the first switching valve 29 and the fourth switching valve 41. The high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 22 in the heat recovery heat exchanger 21, and becomes medium-temperature gaseous refrigerant after preparing hot water. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 212 of the heat recovery heat exchanger 21 enters the third refrigerant inlet 241 of the high-pressure gas-liquid separator 24 through the fifth switching valve 42, and undergoes further gas-liquid separation in the high-pressure gas-liquid separator 24 to ensure that the refrigerant output from the fourth refrigerant outlet 243 is pure gaseous. The medium-temperature gaseous refrigerant output from the fourth refrigerant outlet 243 enters the first refrigerant port 121 of the outdoor heat exchanger 12 after passing through the first valve port 281 and the second valve port 282 of the first reversing valve 28 and the fourth valve port 301 and the fifth valve port 302 of the second reversing valve 30. The medium-temperature gaseous refrigerant condenses and releases heat in the outdoor heat exchanger 12, becoming a medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the second refrigerant port 122 of the outdoor heat exchanger 12 enters the enthalpy-increasing main circuit (i.e., the sixth refrigerant port 332 and the fifth refrigerant port 331) through the second one-way valve 37. One path of the medium-temperature liquid refrigerant output from the enthalpy-increasing main circuit enters the liquid pipe 17 through the sixth switching valve 43. Another path of the medium-temperature liquid refrigerant output from the enthalpy-increasing main circuit of the heat exchanger 33 enters the enthalpy-increasing auxiliary circuit (i.e., the fourth throttling device). (32, the seventh refrigerant port 333 and the sixth refrigerant port 332), after the medium-temperature liquid refrigerant is throttled and cooled by the fourth throttling device 32 in the enthalpy-increasing auxiliary circuit, it can more efficiently absorb the refrigerant heat from the enthalpy-increasing main circuit in the heat exchanger 33 and become low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the enthalpy-increasing auxiliary circuit returns to the inlet of the compressor 11 after passing through the second switching valve 34 and the low-pressure gas-liquid separator 26.The medium-temperature liquid refrigerant in the enthalpy-increasing main circuit is cooled down by heat exchange and becomes a lower-temperature liquid refrigerant. One path of the low-temperature liquid refrigerant output from the enthalpy-increasing main circuit enters the liquid pipe 17 through the sixth switch valve 43. Another path of the low-temperature liquid refrigerant output from the enthalpy-increasing main circuit of the heat exchanger 33 enters the enthalpy-increasing auxiliary circuit. The medium-temperature or low-temperature liquid refrigerant enters the second throttling device 40 in the liquid pipe 17. After being throttled and cooled by the second throttling device 40, it becomes a lower-temperature liquid refrigerant and then enters the third refrigerant port 131 of the indoor unit 13. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 13. After absorbing heat from the indoor air, the low-temperature liquid refrigerant evaporates and becomes a low-temperature gaseous refrigerant. The indoor unit 13 blows out cold air. The low-temperature gaseous refrigerant output from the fourth refrigerant port 132 of the indoor unit 13 enters the gas pipe 16. The low-temperature gaseous refrigerant output from the gas pipe 16 passes through the seventh switching valve 44, the seventh valve port 304 and the sixth valve port 303 of the second reversing valve 30, and the low-pressure gas-liquid separator 26 before returning to the inlet of the compressor 11, in a reciprocating cycle.

[0118] The heat recovery heat exchanger 21 is connected to the domestic water tank 22, so that at least part of the condensation heat that the outdoor heat exchanger 12 was originally used to exchange heat with the air can be recovered and reused during cooling, avoiding the waste of heat when the outdoor heat exchanger 12 exchanges heat with the air. The recovered heat is exchanged with the water in the domestic water tank 22 in the heat recovery heat exchanger 21 to quickly produce hot water, improve energy utilization, and increase the speed of hot water production.

[0119] Specifically, Figure 3 and Figure 2 The difference in the illustrated embodiment is that, Figure 3 In order to recover and reuse at least a portion of the condensation heat originally used by the outdoor heat exchanger 12 for heat exchange with the air, Figure 2 In order to recover and utilize all the condensation heat originally used by the outdoor heat exchanger 12 for heat exchange with the air.

[0120] like Figure 4As shown, in the cooling and waste heat recovery domestic hot water production mode, the second throttling device 40, the first switching valve 29, the second switching valve 34, the fourth switching valve 41, the fifth switching valve 42, the sixth switching valve 43, and the seventh switching valve 44 are open. The second valve port 282 of the first reversing valve 28 is connected to the first valve port 281 and the third valve port 283. The fourth valve port 301 of the second reversing valve 30 is connected to the fifth valve port 302. The seventh valve port 304 of the second reversing valve 30 is connected to the sixth valve port 303. That is, when hot water needs to be prepared in cooling mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the second refrigerant inlet 211 of the heat recovery heat exchanger 21 after passing through the first switching valve 29 and the fourth switching valve 41. The high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the first refrigerant port 121 of the outdoor heat exchanger 12 after passing through the third valve port 283 and the second valve port 282 of the first reversing valve 28 and the fourth valve port 301 and the fifth valve port 302 of the second reversing valve 30. High-temperature gaseous refrigerant exchanges heat with water in the domestic water tank 22 in the heat recovery heat exchanger 21 to produce hot water, which then becomes medium-temperature gaseous refrigerant. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 212 of the heat recovery heat exchanger 21 enters the third refrigerant inlet 241 of the high-pressure gas-liquid separator 24 through the fifth switching valve 42, where further gas-liquid separation is performed to ensure that the refrigerant output from the fourth refrigerant outlet 243 is pure gaseous. The medium-temperature gaseous refrigerant output from the fourth refrigerant outlet 243 enters the first refrigerant port 121 of the outdoor heat exchanger 12 after passing through the first valve port 281 and the second valve port 282 of the first reversing valve 28 and the fourth valve port 301 and the fifth valve port 302 of the second reversing valve 30. The medium-temperature gaseous refrigerant condenses and releases heat in the outdoor heat exchanger 12, becoming medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the second refrigerant port 122 of the outdoor heat exchanger 12 enters the enthalpy-increasing main circuit (i.e., the sixth refrigerant port 332 and the fifth refrigerant port 331) via the second one-way valve 37. One path of the medium-temperature liquid refrigerant output from the enthalpy-increasing main circuit enters the liquid pipe 17 via the sixth switching valve 43. Another path of the medium-temperature liquid refrigerant output from the enthalpy-increasing main circuit of the heat exchanger 33 enters the enthalpy-increasing auxiliary circuit (i.e., the fourth sectionalizing flow). (32, the seventh refrigerant port 333 and the sixth refrigerant port 332), after the medium-temperature liquid refrigerant is throttled and cooled by the fourth throttling device 32 in the enthalpy-increasing auxiliary circuit, it can more efficiently absorb the refrigerant heat from the enthalpy-increasing main circuit in the heat exchanger 33 and become low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the enthalpy-increasing auxiliary circuit returns to the inlet of the compressor 11 after passing through the second switching valve 34 and the low-pressure gas-liquid separator 26.The medium-temperature liquid refrigerant in the enthalpy-increasing main circuit is cooled down by heat exchange and becomes a lower-temperature liquid refrigerant. One path of the low-temperature liquid refrigerant output from the enthalpy-increasing main circuit enters the liquid pipe 17 through the sixth switch valve 43. Another path of the low-temperature liquid refrigerant output from the enthalpy-increasing main circuit of the heat exchanger 33 enters the enthalpy-increasing auxiliary circuit. The medium-temperature or low-temperature liquid refrigerant enters the second throttling device 40 in the liquid pipe 17. After being throttled and cooled by the second throttling device 40, it becomes a lower-temperature liquid refrigerant and then enters the third refrigerant port 131 of the indoor unit 13. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 13. After absorbing heat from the indoor air, the low-temperature liquid refrigerant evaporates and becomes a low-temperature gaseous refrigerant. The indoor unit 13 blows out cold air. The low-temperature gaseous refrigerant output from the fourth refrigerant port 132 of the indoor unit 13 enters the gas pipe 16. The low-temperature gaseous refrigerant output from the gas pipe 16 passes through the seventh switching valve 44, the seventh valve port 304 and the sixth valve port 303 of the second reversing valve 30, and the low-pressure gas-liquid separator 26 before returning to the inlet of the compressor 11, in a reciprocating cycle.

[0121] Specifically, Figure 4 and Figure 3 The difference in the illustrated embodiment is that, Figure 4 In the illustrated embodiment, an additional refrigerant path enters the outdoor heat exchanger 12 via the third valve port 283 and the second valve port 282 of the first reversing valve 28, and the fourth valve port 301 and the fifth valve port 302 of the second reversing valve 30. This allows for better control of the amount of refrigerant entering the heat recovery heat exchanger 21. Furthermore, the path where the refrigerant from the compressor 11 directly reaches the second reversing valve 30 ensures that it is in a pure gaseous state. This pure gaseous state further ensures that the second reversing valve 30 has sufficient pressure differential for reversing, thus reducing pressure loss in the refrigerant pipeline.

[0122] like Figure 5As shown, in the heating and domestic hot water mode, the fourth throttling device 32, the second throttling device 40, the fifth throttling device 36, the first throttling device 18, the first switching valve 29, the third switching valve 35, the fourth switching valve 41, the fifth switching valve 42, the sixth switching valve 43, and the seventh switching valve 44 are open. The first valve port 281 of the first reversing valve 28 is connected to the second valve port 282. The fourth valve port 301 of the second reversing valve 30 is connected to the seventh valve port 304. The fifth valve port 302 of the second reversing valve 30 is connected to the sixth valve port 303. That is, when hot water needs to be prepared in heating mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the second refrigerant inlet 211 of the heat recovery heat exchanger 21 after passing through the first switching valve 29 and the fourth switching valve 41. The high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 22 in the heat recovery heat exchanger 21, and becomes medium-temperature gaseous refrigerant after preparing hot water. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 212 of the heat recovery heat exchanger 21 enters the third refrigerant inlet 241 of the high-pressure gas-liquid separator 24 through the fifth switching valve 42, and undergoes further gas-liquid separation in the high-pressure gas-liquid separator 24 to ensure that the refrigerant output from the fourth refrigerant outlet 243 is pure gas. The medium-temperature gaseous refrigerant output from the fourth refrigerant outlet 243 enters the gas pipe 16 via the first valve port 281 and the second valve port 282 of the first reversing valve 28, the fourth valve port 301 and the seventh valve port 304 of the second reversing valve 30, and the seventh switching valve 44. The medium-temperature gaseous refrigerant enters the fourth refrigerant port 132 of the indoor unit 13 within the gas pipe 16. The medium-temperature gaseous refrigerant exchanges heat with the indoor air in the indoor unit 13. After releasing heat into the indoor air, the medium-temperature gaseous refrigerant condenses into medium-temperature liquid refrigerant, and the indoor unit 13 blows out hot air. The medium-temperature liquid refrigerant output from the third refrigerant port 131 of the indoor unit 13 is throttled and cooled by the second throttling device 40, becoming low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the second throttling device 40 enters the liquid pipe 17. Furthermore, the medium-temperature gaseous refrigerant enters the first refrigerant inlet 141 of the floor heating heat exchanger 14 through the gas pipe 16. After heat exchange with the water in the terminal 19 in the floor heating heat exchanger 14, the medium-temperature gaseous refrigerant becomes medium-temperature liquid refrigerant, while the water in the terminal 19 becomes hot water. The medium-temperature liquid refrigerant output from the first refrigerant outlet 142 of the floor heating heat exchanger 14 is throttled and cooled by the first throttling device 18, becoming low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the first throttling device 18 enters the liquid pipe 17 through the first one-way valve 15.The low-temperature liquid refrigerant output from the liquid pipe 17 enters the enthalpy-increasing main circuit (i.e., the fifth refrigerant port 331 and the sixth refrigerant port 332) through the sixth switching valve 43, and enters the enthalpy-increasing auxiliary circuit (i.e., the fourth throttling device 32, the seventh refrigerant port 333 and the sixth refrigerant port 332) through the sixth switching valve 43. After being throttled and cooled by the fourth throttling device 32 in the enthalpy-increasing auxiliary circuit, the low-temperature liquid refrigerant can absorb heat from the refrigerant in the enthalpy-increasing main circuit more efficiently in the heat exchanger 33, and become low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the enthalpy-increasing auxiliary circuit returns to the enthalpy-increasing port 111 of the compressor 11 through the third switching valve 35. The low-temperature liquid refrigerant in the enthalpy-increasing main path, after heat exchange to lower its temperature, becomes an even lower-temperature liquid refrigerant. It then enters the fifth throttling device 36 for further throttling and cooling, becoming an even lower-temperature liquid refrigerant before entering the second refrigerant port 122 of the outdoor heat exchanger 12. In the outdoor heat exchanger 12, the low-temperature liquid refrigerant evaporates and absorbs heat, becoming a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the first refrigerant port 121 of the outdoor heat exchanger 12 passes through the fifth valve port 302 and the sixth valve port 303 of the second reversing valve 30, and the low-pressure gas-liquid separator 26 before returning to the inlet of the compressor 11, in a continuous cycle. This heat pump system can produce hot water and provide underfloor heating while simultaneously generating heat, thus improving energy efficiency.

[0123] like Figure 6As shown, in the heating and domestic hot water mode, the fourth throttling device 32, the second throttling device 40, the fifth throttling device 36, the first throttling device 18, the first switching valve 29, the third switching valve 35, the fourth switching valve 41, the fifth switching valve 42, the sixth switching valve 43, and the seventh switching valve 44 are open. The second valve port 282 of the first reversing valve 28 is connected to the first valve port 281 and the third valve port 283. The fourth valve port 301 of the second reversing valve 30 is connected to the seventh valve port 304. The fifth valve port 302 of the second reversing valve 30 is connected to the sixth valve port 303. That is, when hot water needs to be prepared in heating mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the second refrigerant inlet 211 of the heat recovery heat exchanger 21 after passing through the first switching valve 29 and the fourth switching valve 41. The high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the gas pipe 16 through the third valve port 283 and the second valve port 282 of the first reversing valve 28, the fourth valve port 301 and the seventh valve port 304 of the second reversing valve 30, and the seventh switching valve 44. The high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 22 in the heat recovery heat exchanger 21 to prepare hot water, and then becomes a medium-temperature gaseous refrigerant. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 212 of the heat recovery heat exchanger 21 enters the third refrigerant inlet 241 of the high-pressure gas-liquid separator 24 through the fifth switching valve 42, and undergoes further gas-liquid separation in the high-pressure gas-liquid separator 24 to ensure that the refrigerant output from the fourth refrigerant outlet 243 is pure gas. The medium-temperature gaseous refrigerant output from the fourth refrigerant outlet 243 enters the gas pipe 16 via the first valve port 281 and the second valve port 282 of the first reversing valve 28, the fourth valve port 301 and the seventh valve port 304 of the second reversing valve 30, and the seventh switching valve 44. The medium-temperature gaseous refrigerant enters the fourth refrigerant port 132 of the indoor unit 13 within the gas pipe 16. The medium-temperature gaseous refrigerant exchanges heat with the indoor air in the indoor unit 13. After releasing heat into the indoor air, the medium-temperature gaseous refrigerant condenses into medium-temperature liquid refrigerant, and the indoor unit 13 blows out hot air. The medium-temperature liquid refrigerant output from the third refrigerant port 131 of the indoor unit 13 is throttled and cooled by the second throttling device 40, becoming low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the second throttling device 40 enters the liquid pipe 17.Furthermore, the medium-temperature gaseous refrigerant enters the first refrigerant inlet 141 of the floor heating heat exchanger 14 through the gas pipe 16. After heat exchange with the water in the terminal 19 in the floor heating heat exchanger 14, the medium-temperature gaseous refrigerant becomes medium-temperature liquid refrigerant, while the water in the terminal 19 becomes hot water. The medium-temperature liquid refrigerant output from the first refrigerant outlet 142 of the floor heating heat exchanger 14 is throttled and cooled by the first throttling device 18, becoming low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the first throttling device 18 enters the liquid pipe 17 through the first one-way valve 15. The low-temperature liquid refrigerant output from the liquid pipe 17 enters the enthalpy-increasing main circuit (i.e., the fifth refrigerant port 331 and the sixth refrigerant port 332) through the sixth switching valve 43, and enters the enthalpy-increasing auxiliary circuit (i.e., the fourth throttling device 32, the seventh refrigerant port 333 and the sixth refrigerant port 332) through the sixth switching valve 43. After being throttled and cooled by the fourth throttling device 32 in the enthalpy-increasing auxiliary circuit, the low-temperature liquid refrigerant can absorb heat from the refrigerant in the enthalpy-increasing main circuit more efficiently in the heat exchanger 33, and become low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the enthalpy-increasing auxiliary circuit returns to the enthalpy-increasing port 111 of the compressor 11 through the third switching valve 35. The low-temperature liquid refrigerant in the enthalpy-increasing main circuit is cooled down by heat exchange and becomes an even lower-temperature liquid refrigerant. It then enters the fifth throttling device 36 for throttling and cooling, becoming an even lower-temperature liquid refrigerant. After entering the second refrigerant port 122 of the outdoor heat exchanger 12, the low-temperature liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 12, becoming a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the first refrigerant port 121 of the outdoor heat exchanger 12 passes through the fifth valve port 302 and the sixth valve port 303 of the second reversing valve 30 and the low-pressure gas-liquid separator 26 before returning to the inlet of the compressor 11, repeating the cycle.

[0124] Specifically, Figure 6 and Figure 5 The difference in the illustrated embodiment is that, Figure 6 In the illustrated embodiment, an additional path leads from the third valve port 283 and the second valve port 282 of the first reversing valve 28, the fourth valve port 301 and the seventh valve port 304 of the second reversing valve 30, and the sixth switching valve 43 into the gas pipe 16. This allows for better control of the amount of refrigerant entering the heat recovery heat exchanger 21. Furthermore, the path from the compressed refrigerant directly to the second reversing valve 30 ensures that the refrigerant is in a gaseous state. The pure gaseous refrigerant further ensures that the second reversing valve 30 has sufficient pressure differential for reversing, thus minimizing pressure loss in the refrigerant pipeline.

[0125] like Figure 7As shown, in pure hot water mode, the third throttling device 31, the fifth throttling device 36, the first switching valve 29, the fourth switching valve 41 and the fifth switching valve 42 are open, the first valve port 281 of the first reversing valve 28 is connected to or not connected to the second valve port 282, and the fifth valve port 302 of the second reversing valve 30 is connected to the sixth valve port 303. That is, when only hot water needs to be produced, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the second refrigerant inlet 211 of the heat recovery heat exchanger 21 after passing through the first switching valve 29 and the fourth switching valve 41. The high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 22 in the heat recovery heat exchanger 21, and becomes a medium-temperature liquid refrigerant after producing hot water. The medium-temperature liquid refrigerant output from the second refrigerant outlet 212 of the heat recovery heat exchanger 21 enters the third refrigerant inlet 241 of the high-pressure gas-liquid separator 24 through the fifth switching valve 42, and undergoes further gas-liquid separation in the high-pressure gas-liquid separator 24 to ensure that the refrigerant output from the third refrigerant outlet 242 is pure liquid. The medium-temperature liquid refrigerant output from the third refrigerant outlet 242 is throttled and cooled by the third throttling device 31, becoming a lower-temperature liquid refrigerant. It then enters the fifth throttling device 36 for further throttling and cooling, becoming an even lower-temperature liquid refrigerant. It then enters the second refrigerant port 122 of the outdoor heat exchanger 12. The low-temperature liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 12, becoming a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the first refrigerant port 121 of the outdoor heat exchanger 12 passes through the fifth valve port 302 and the sixth valve port 303 of the second reversing valve 30 and the low-pressure gas-liquid separator 26 before returning to the inlet of the compressor 11, repeating the cycle.

[0126] like Figure 8As shown, in cooling mode, the fourth throttling device 32, the second throttling device 40, the second switching valve 34, the sixth switching valve 43, and the seventh switching valve 44 are open. The third valve port 283 of the first reversing valve 28 is connected to the second valve port 282, the fourth valve port 301 of the second reversing valve 30 is connected to the fifth valve port 302, and the seventh valve port 304 of the second reversing valve 30 is connected to the sixth valve port 303. That is, during summer cooling, the high-temperature gaseous refrigerant output from the compressor 11 enters the first refrigerant port 121 of the outdoor heat exchanger 12 after passing through the third valve port 283 and the second valve port 282 of the first reversing valve 28, and the fourth valve port 301 and the fifth valve port 302 of the second reversing valve 30. The high-temperature gaseous refrigerant condenses and releases heat in the outdoor heat exchanger 12, becoming a medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the second refrigerant port 122 of the outdoor heat exchanger 12 enters the enthalpy-increasing main circuit (i.e., the sixth refrigerant port 332 and the fifth refrigerant port 331) via the second one-way valve 37. One path of the medium-temperature liquid refrigerant output from the enthalpy-increasing main circuit enters the liquid pipe 17 via the sixth switching valve 43. Another path of the medium-temperature liquid refrigerant output from the enthalpy-increasing main circuit of the heat exchanger 33 enters the enthalpy-increasing auxiliary circuit (i.e., the fourth sectionalizing flow). (32, the seventh refrigerant port 333 and the sixth refrigerant port 332), after the medium-temperature liquid refrigerant is throttled and cooled by the fourth throttling device 32 in the enthalpy-increasing auxiliary circuit, it can more efficiently absorb the refrigerant heat from the enthalpy-increasing main circuit in the heat exchanger 33 and become low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the enthalpy-increasing auxiliary circuit returns to the inlet of the compressor 11 after passing through the second switching valve 34 and the low-pressure gas-liquid separator 26. The medium-temperature liquid refrigerant in the enthalpy-increasing main circuit is cooled down by heat exchange and becomes a lower-temperature liquid refrigerant. One path of the low-temperature liquid refrigerant output from the enthalpy-increasing main circuit enters the liquid pipe 17 through the sixth switch valve 43. Another path of the low-temperature liquid refrigerant output from the enthalpy-increasing main circuit of the heat exchanger 33 enters the enthalpy-increasing auxiliary circuit. The medium-temperature or low-temperature liquid refrigerant enters the second throttling device 40 in the liquid pipe 17. After being throttled and cooled by the second throttling device 40, it becomes a lower-temperature liquid refrigerant and then enters the third refrigerant port 131 of the indoor unit 13. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 13. After absorbing heat from the indoor air, the low-temperature liquid refrigerant evaporates and becomes a low-temperature gaseous refrigerant. The indoor unit 13 blows out cold air. The low-temperature gaseous refrigerant output from the fourth refrigerant port 132 of the indoor unit 13 enters the gas pipe 16. The low-temperature gaseous refrigerant output from the gas pipe 16 passes through the seventh switching valve 44, the seventh valve port 304 and the sixth valve port 303 of the second reversing valve 30, and the low-pressure gas-liquid separator 26 before returning to the inlet of the compressor 11, in a reciprocating cycle.

[0127] like Figure 9As shown, in heating mode, the fourth throttling device 32, the fifth throttling device 36, the second throttling device 40, the first throttling device 18, the third switching valve 35, the sixth switching valve 43, and the seventh switching valve 44 are open. The second valve port 282 of the first reversing valve 28 is connected to the third valve port 283. The fourth valve port 301 of the second reversing valve 30 is connected to the seventh valve port 304. The fifth valve port 302 of the second reversing valve 30 is connected to the sixth valve port 303. That is, when heating is required in winter, the high-temperature gaseous refrigerant output from the compressor 11 enters the gas pipe 16 through the third valve port 283 and the second valve port 282 of the first reversing valve 28, the fourth valve port 301 and the seventh valve port 304 of the second reversing valve 30, and the seventh switching valve 44. The medium-temperature gaseous refrigerant enters the fourth refrigerant port 132 of the indoor unit 13 in the gas pipe 16. The medium-temperature gaseous refrigerant exchanges heat with the indoor air in the indoor unit 13. After releasing heat into the indoor air, the medium-temperature gaseous refrigerant condenses into medium-temperature liquid refrigerant. The indoor unit 13 blows out hot air. The medium-temperature liquid refrigerant output from the third refrigerant port 131 of the indoor unit 13 is throttled and cooled by the second throttling device 40 and becomes low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the second throttling device 40 enters the liquid pipe 17. Furthermore, the medium-temperature gaseous refrigerant enters the first refrigerant inlet 141 of the floor heating heat exchanger 14 through the gas pipe 16. After heat exchange with the water in the terminal 19 in the floor heating heat exchanger 14, the medium-temperature gaseous refrigerant becomes medium-temperature liquid refrigerant, while the water in the terminal 19 becomes hot water. The medium-temperature liquid refrigerant output from the first refrigerant outlet 142 of the floor heating heat exchanger 14 is throttled and cooled by the first throttling device 18, becoming low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output from the first throttling device 18 enters the liquid pipe 17 through the first one-way valve 15. The low-temperature liquid refrigerant output from the liquid pipe 17 enters the enthalpy-increasing main circuit (i.e., the fifth refrigerant port 331 and the sixth refrigerant port 332) through the sixth switching valve 43, and enters the enthalpy-increasing auxiliary circuit (i.e., the fourth throttling device 32, the seventh refrigerant port 333 and the sixth refrigerant port 332) through the sixth switching valve 43. After being throttled and cooled by the fourth throttling device 32 in the enthalpy-increasing auxiliary circuit, the low-temperature liquid refrigerant can absorb heat from the refrigerant in the enthalpy-increasing main circuit more efficiently in the heat exchanger 33, and become low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the enthalpy-increasing auxiliary circuit returns to the enthalpy-increasing port 111 of the compressor 11 through the third switching valve 35.The low-temperature liquid refrigerant in the enthalpy-increasing main circuit, after heat exchange to lower its temperature, becomes an even lower-temperature liquid refrigerant. It then enters the fifth throttling device 36 for further throttling and cooling, becoming an even lower-temperature liquid refrigerant before entering the second refrigerant port 122 of the outdoor heat exchanger 12. In the outdoor heat exchanger 12, the low-temperature liquid refrigerant evaporates and absorbs heat, becoming a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the first refrigerant port 121 of the outdoor heat exchanger 12 passes through the fifth valve port 302 and the sixth valve port 303 of the second reversing valve 30, and the low-pressure gas-liquid separator 26 before returning to the inlet of the compressor 11, in a continuous cycle. This heat pump system can provide heating while also achieving effects such as underfloor heating, improving energy efficiency.

[0128] 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.

[0129] By implementing this utility model, the following beneficial effects can be achieved:

[0130] This invention adds a first one-way valve 15 to the first refrigerant outlet 142 of the underfloor heating heat exchanger 14. The first one-way valve 15 allows the refrigerant to flow from the first refrigerant outlet 142 to the outdoor heat exchanger 12 in the heating flow direction, and prohibits the refrigerant from flowing in the opposite direction. Therefore, when the heat pump system is running in cooling mode, due to the presence of the first one-way valve 15, the low-temperature refrigerant cannot enter the underfloor heating heat exchanger 14 from the first refrigerant outlet 142, thereby completely solving the problem of the underfloor heating heat exchanger 14 freezing and breaking when the heat pump system is running in cooling mode.

[0131] It is understood that the above embodiments only illustrate some implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model 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 utility model, and can also make several modifications and improvements, all of which fall within the protection scope of this utility model. 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 utility model should fall within the coverage of the claims of this utility model.

Claims

1. A heat pump system, characterized in that, include: The compressor is used to compress refrigerant; An outdoor heat exchanger includes a first refrigerant port and a second refrigerant port, the first refrigerant port being connected to the second refrigerant port, and the first refrigerant port being connected to the outlet and inlet of the compressor respectively; At least one indoor unit, the indoor unit including a third refrigerant port and a fourth refrigerant port, the third refrigerant port being connected to the fourth refrigerant port, the third refrigerant port being connected to the second refrigerant port, and the fourth refrigerant port being connected to the outlet and inlet of the compressor respectively; At least one underfloor heating heat exchanger and a first one-way valve corresponding to each of the underfloor heating heat exchangers. The underfloor heating heat exchanger includes a first refrigerant inlet and a first refrigerant outlet. The first refrigerant inlet is connected to the first refrigerant outlet and is connected to the outlet of the compressor. The first refrigerant outlet is connected to a second refrigerant port via the first one-way valve, and the conduction direction of the first one-way valve is towards the second refrigerant port.

2. The heat pump system according to claim 1, characterized in that, The heat pump system also includes: The gas pipe and liquid pipe are connected together. The second refrigerant port is connected to the main interface end of the liquid pipe. The third refrigerant port and the first refrigerant outlet are respectively connected to the corresponding branch interfaces in the liquid pipe. The fourth refrigerant port and the first refrigerant inlet are respectively connected to the corresponding branch interfaces in the gas pipe. The main interface end of the gas pipe is connected to the outlet and inlet of the compressor.

3. The heat pump system according to claim 1, characterized in that, The heat pump system also includes: The first throttling device is located on the pipeline between the first refrigerant outlet and the first check valve. The first throttling device is used to throttle the refrigerant output from the first refrigerant outlet. And / or, corresponding to the second throttling device provided for each of the indoor units, the third refrigerant port is connected to the second refrigerant port via the second throttling device.

4. The heat pump system according to claim 1, characterized in that, When the heat pump system is operating in cooling mode, the first one-way valve is used to block the refrigerant from flowing into the floor heating heat exchanger. When the heat pump system is operating in heating mode, the refrigerant flows in from the first refrigerant inlet and flows out after passing through the first refrigerant outlet and the first one-way valve.

5. The heat pump system according to claim 1, characterized in that, The heat pump system also includes: A heat recovery heat exchanger is used to realize heat exchange between refrigerant and heat storage medium for heat storage. The heat recovery heat exchanger includes a second refrigerant inlet and a second refrigerant outlet, and the second refrigerant inlet and the second refrigerant outlet are connected. The compressor outlet is connected to the second refrigerant inlet, and the second refrigerant outlet is connected to at least one of the first refrigerant port, the fourth refrigerant port, and the pipeline between the second refrigerant port and the third refrigerant port.

6. The heat pump system according to claim 5, characterized in that, The heat pump system also includes: The high-pressure gas-liquid separator is provided, and the second refrigerant outlet is connected to at least one of the first refrigerant port, the fourth refrigerant port, and the pipeline between the second refrigerant port and the third refrigerant port via the high-pressure gas-liquid separator.

7. The heat pump system according to claim 6, characterized in that, The high-pressure gas-liquid separator includes a third refrigerant inlet, a third refrigerant outlet, and a fourth refrigerant outlet; The third refrigerant inlet is connected to the third refrigerant outlet and the fourth refrigerant outlet respectively. The third refrigerant outlet is used to output the liquid refrigerant after gas-liquid separation, and the fourth refrigerant outlet is used to output the gaseous refrigerant after gas-liquid separation. The second refrigerant outlet is connected to the third refrigerant inlet, the third refrigerant outlet is connected to the pipeline between the second refrigerant port and the third refrigerant port, and the fourth refrigerant outlet is connected to the first refrigerant port and / or the fourth refrigerant port.

8. The heat pump system according to claim 7, characterized in that, The heat pump system also includes: The system includes a heat recovery branch and a low-pressure gas-liquid separator. One of the third refrigerant outlets is connected to the pipeline between the second refrigerant port and the third refrigerant port. The other of the third refrigerant outlets is connected to the inlet of the low-pressure gas-liquid separator via the heat recovery branch. The outlet of the low-pressure gas-liquid separator is connected to the inlet of the compressor.

9. The heat pump system according to claim 7, characterized in that, The heat pump system also includes: The first reversing valve connects the compressor outlet to the first refrigerant port and the fourth refrigerant port respectively, and the fourth refrigerant outlet connects to the first refrigerant port and / or the fourth refrigerant port through the first reversing valve.

10. The heat pump system according to claim 1, characterized in that, The heat pump system also includes: The second reversing valve includes a fourth valve port, a fifth valve port, a sixth valve port, and a seventh valve port; the fourth valve port is connected to the outlet of the compressor, the fifth valve port is connected to the first refrigerant port, the sixth valve port is connected to the inlet of the compressor, and the seventh valve port is connected to the fourth refrigerant port.

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