Heat pump system

Abstract

The application discloses a heat pump system, which comprises a compressor, an outdoor heat exchanger, a hot water heat exchanger, a high-pressure gas-liquid separator, a throttling device, a first valve, a first pipeline and a second pipeline. The outdoor heat exchanger comprises first and second refrigerant ports in communication. The hot water heat exchanger comprises third and fourth refrigerant ports in communication. The high-pressure gas-liquid separator comprises a first refrigerant inlet and a liquid refrigerant outlet in communication. The outlet of the compressor is connected with the first refrigerant port. The second refrigerant port is connected with the first end of the throttling device. The second end of the throttling device is connected with the third refrigerant port through the first pipeline in one way and is connected with the third refrigerant port through the first valve, the liquid refrigerant outlet and the first refrigerant inlet in another way. The fourth refrigerant port is connected with the inlet of the compressor through the second pipeline. The application forms a defrosting circulation loop of the compressor, the outdoor heat exchanger and the hot water heat exchanger, and realizes hot water defrosting.

Description

Technical Field

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

[0002] Heat pump systems using this technology can extract heat from low-temperature environments. However, during winter heating, when the outdoor ambient temperature is low, frost often forms on the surface of the outdoor heat exchanger, affecting heat exchange efficiency and the unit's heating capacity. When the frost accumulates to a certain level, it can trigger an alarm and shutdown of the unit, requiring defrosting. The defrosting mode of this heat pump system has the following drawbacks: defrosting requires switching from winter heating mode to cooling mode, causing the air conditioning terminal, which was originally in heating mode, to briefly switch to cooling, impacting the user experience. Utility Model Content

[0003] The technical problem to be solved by this application is to address at least one defect of the related technologies mentioned in the background: the heat pump system of the related technologies needs to switch from winter heating mode to cooling mode before defrosting, which causes the air conditioning terminal, which was originally heating, to be adjusted to cooling for a short time, affecting the user experience. Therefore, this application provides a heat pump system.

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

[0005] The compressor is used to compress refrigerant;

[0006] An outdoor heat exchanger, the outdoor heat exchanger including a first refrigerant port and a second refrigerant port, the first refrigerant port being connected to the second refrigerant port;

[0007] A hot water heat exchanger, the hot water heat exchanger including a third refrigerant port and a fourth refrigerant port, the third refrigerant port being connected to the fourth refrigerant port;

[0008] A high-pressure gas-liquid separator, comprising a first refrigerant inlet and a liquid refrigerant outlet, wherein the liquid refrigerant outlet is connected to the first refrigerant inlet;

[0009] A throttling device for throttling refrigerant;

[0010] First valve, first pipeline, and second pipeline;

[0011] The compressor outlet is connected to the first refrigerant port of the outdoor heat exchanger; the second refrigerant port of the outdoor heat exchanger is connected to the first end of the throttling device; the second end of the throttling device is connected via the first pipeline to the third refrigerant port of the hot water heat exchanger, and the other end of the second end of the throttling device is connected via the first valve, the liquid refrigerant outlet of the high-pressure gas-liquid separator, and the first refrigerant inlet to the third refrigerant port of the hot water heat exchanger; the fourth refrigerant port of the hot water heat exchanger is connected to the compressor inlet via the second pipeline.

[0012] In some embodiments, the heat pump system further includes:

[0013] A second valve and a third valve, wherein the second valve is located on the first pipeline and the third valve is located on the second pipeline.

[0014] In some embodiments, the first valve is a one-way valve, and the conduction direction of the one-way valve is toward the second end of the throttling device; and / or, the second valve and the third valve are on / off valves.

[0015] In some embodiments, the fourth refrigerant port of the hot water heat exchanger is also connected to the outlet of the compressor, and the first refrigerant port of the outdoor heat exchanger is also connected to the inlet of the compressor.

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

[0017] The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected;

[0018] The fourth refrigerant port of the hot water heat exchanger is also connected to the outlet of the compressor, the sixth refrigerant port of the indoor unit is connected to the first end of the throttling device, and the fifth refrigerant port of the indoor unit is connected to the inlet of the compressor.

[0019] In some embodiments, the high-pressure gas-liquid separator further includes a first gaseous refrigerant outlet, which is connected to the first refrigerant inlet;

[0020] The heat pump system also includes:

[0021] The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected;

[0022] The fourth refrigerant port of the hot water heat exchanger is also connected to the outlet of the compressor; the third refrigerant port of the hot water heat exchanger is also connected to the first refrigerant port of the outdoor heat exchanger via the first refrigerant inlet and the first gaseous refrigerant outlet of the high-pressure gas-liquid separator; the second refrigerant port of the outdoor heat exchanger is also connected to the sixth refrigerant port of the indoor unit via the throttling device; and the fifth refrigerant port of the indoor unit is connected to the inlet of the compressor.

[0023] In some embodiments, the high-pressure gas-liquid separator further includes a first gaseous refrigerant outlet, which is connected to the first refrigerant inlet;

[0024] The heat pump system also includes:

[0025] The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected;

[0026] The fourth refrigerant port of the hot water heat exchanger is also connected to the outlet of the compressor; the third refrigerant port of the hot water heat exchanger is also connected to the fifth refrigerant port of the indoor unit via the first refrigerant inlet and the first gaseous refrigerant outlet of the high-pressure gas-liquid separator; the second refrigerant port of the outdoor heat exchanger is also connected to the sixth refrigerant port of the indoor unit via the throttling device; and the first refrigerant port of the outdoor heat exchanger is also connected to the inlet of the compressor.

[0027] In some embodiments, the heat pump system further includes:

[0028] The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected;

[0029] The second refrigerant port of the outdoor heat exchanger is connected to the sixth refrigerant port of the indoor unit via the throttling device, and the fifth refrigerant port of the indoor unit is connected to the inlet of the compressor.

[0030] In some embodiments, the heat pump system further includes:

[0031] The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected;

[0032] The fifth refrigerant port of the indoor unit is connected to the outlet of the compressor, the second refrigerant port of the outdoor heat exchanger is also connected to the sixth refrigerant port of the indoor unit via the throttling device, and the first refrigerant port of the outdoor heat exchanger is also connected to the inlet of the compressor.

[0033] In some embodiments, the throttling device includes a first throttling valve and a second throttling valve; the high-pressure gas-liquid separator further includes a first gaseous refrigerant outlet, which is connected to the first refrigerant inlet;

[0034] The heat pump system also includes:

[0035] The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected;

[0036] The compressor outlet is connected to the first refrigerant port of the outdoor heat exchanger, the fifth refrigerant port of the indoor unit, and the fourth refrigerant port of the hot water heat exchanger. One path of the second refrigerant port of the outdoor heat exchanger is connected to the first end of the first throttling valve, and another path of the second refrigerant port of the outdoor heat exchanger is connected to the sixth refrigerant port of the indoor unit via the second throttling valve. The sixth refrigerant port of the indoor unit is also connected to the first end of the first throttling valve. One path of the second end of the first throttling valve is connected to the third refrigerant port of the hot water heat exchanger via the first pipeline. The first throttle valve is connected to the second end of the first valve, and the second end of the first throttle valve is connected to the third refrigerant port of the hot water heat exchanger via the first valve, the liquid refrigerant outlet of the high-pressure gas-liquid separator, and the first refrigerant inlet. The first gaseous refrigerant outlet of the high-pressure gas-liquid separator is connected to the first refrigerant port of the outdoor heat exchanger and the fifth refrigerant port of the indoor unit. The fourth refrigerant port of the hot water heat exchanger is connected to the inlet of the compressor via the second pipeline. The first refrigerant port of the outdoor heat exchanger and the fifth refrigerant port of the indoor unit are also connected to the inlet of the compressor.

[0037] In some embodiments, the heat pump system further includes:

[0038] A heat recovery branch and a low-pressure gas-liquid separator, wherein the low-pressure gas-liquid separator includes a second refrigerant inlet and a second gaseous refrigerant outlet, the second refrigerant inlet being connected to the second gaseous refrigerant outlet;

[0039] The liquid refrigerant outlet of the high-pressure gas-liquid separator is connected to the second refrigerant inlet of the low-pressure gas-liquid separator via the heat recovery branch; the second gaseous refrigerant outlet of the low-pressure gas-liquid separator is connected to the inlet of the compressor.

[0040] In some embodiments, the heat pump system further includes:

[0041] Economizer and third throttle valve, the economizer including a seventh refrigerant port, an eighth refrigerant port, a ninth refrigerant port and a tenth refrigerant port;

[0042] The seventh refrigerant port of the economizer is connected to the sixth refrigerant port of the indoor unit; the seventh refrigerant port of the economizer is connected to the eighth refrigerant port to form an enthalpy-increasing main circuit; one path of the eighth refrigerant port of the economizer is connected to the second refrigerant port of the outdoor heat exchanger, and the other path of the eighth refrigerant port of the economizer is connected to the second refrigerant port of the outdoor heat exchanger via the throttling device;

[0043] The first end of the third throttle valve is connected to the pipeline between the seventh refrigerant port of the economizer and the sixth refrigerant port of the indoor unit. The second end of the third throttle valve is connected to the tenth refrigerant port of the economizer via the ninth refrigerant port to form an enthalpy-increasing auxiliary circuit. The tenth refrigerant port of the economizer is connected to the inlet of the compressor.

[0044] In some embodiments, the compressor includes an enthalpy-increasing port;

[0045] The heat pump system also includes:

[0046] The fourth valve and the fifth valve are used. One of the tenth refrigerant ports of the economizer is connected to the inlet of the compressor via the fourth valve, and the other of the tenth refrigerant port of the economizer is connected to the enthalpy-increasing port of the compressor via the fifth valve.

[0047] By implementing this application, the following beneficial effects can be achieved:

[0048] This application connects the first pipeline between the second end of the throttling device and the third refrigerant port of the hot water heat exchanger, and the second pipeline between the fourth refrigerant port of the hot water heat exchanger and the inlet of the compressor, thereby forming a defrosting loop of the compressor, the outdoor heat exchanger, and the hot water heat exchanger. The refrigerant absorbs heat from the domestic hot water in the hot water heat exchanger, thereby achieving defrosting of the outdoor heat exchanger. This solves the problem of the impact on the air conditioning terminal under the previous defrosting mode, and uses domestic hot water for defrosting in winter, improving the user experience during winter heating. Attached Figure Description

[0049] The present application will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0050] Figure 1 This is a schematic diagram of the heat pump system of this application;

[0051] Figure 2 This is a schematic diagram of the refrigerant flow direction of the heat pump system in this application during defrosting;

[0052] Figure 3 This is a schematic diagram of the refrigerant flow direction during defrosting in a heat pump system without a first pipeline and a first valve in this application;

[0053] Figure 4 This is a schematic diagram of the first refrigerant flow direction in the heat pump system of this application when it is used to produce domestic hot water only;

[0054] Figure 5 This is a schematic diagram of the second refrigerant flow direction in the heat pump system of this application when it is used to produce domestic hot water only;

[0055] Figure 6 This is a schematic diagram of the refrigerant flow in the heat pump system of this application, which produces domestic hot water through total heat recovery mode while cooling.

[0056] Figure 7 This is a schematic diagram of the flow direction of the first refrigerant in the heat pump system of this application, which generates domestic hot water through waste heat recovery while cooling.

[0057] Figure 8 This is a schematic diagram of the flow direction of the second refrigerant in the heat pump system of this application, which generates domestic hot water through waste heat recovery while cooling.

[0058] Figure 9 This is a schematic diagram of the flow direction of the first refrigerant in the heat pump system of this application, which produces domestic hot water while heating.

[0059] Figure 10 This is a schematic diagram of the flow direction of the second refrigerant in the heat pump system of this application, which produces domestic hot water while heating.

[0060] Figure 11 This is a schematic diagram of the refrigerant flow direction of the heat pump system in this application during cooling;

[0061] Figure 12 This is a schematic diagram of the refrigerant flow direction of the heat pump system in this application during heating. Detailed Implementation

[0062] To provide a clearer understanding of the technical features, objectives, and effects of this application, the specific embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0063] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0064] In the description of this application, 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 used only for the convenience of describing this application 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 on this application. 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, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0065] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "fixed," "connected," "linked," "located in," and "located in" should be interpreted broadly. For example, they can refer to a fixed connection (or integral structure), a detachable connection, a mechanical connection, a chemical connection, a direct connection, or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0066] 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.

[0067] like Figure 1 As shown, some embodiments of this application disclose a heat pump system, including a compressor 11, an outdoor heat exchanger 12, a hot water heat exchanger 13, a high-pressure gas-liquid separator 14, a throttling device, a first valve 15, a first pipeline 16, and a second pipeline 17, as detailed below:

[0068] The compressor 11 is used to compress refrigerant. The throttling device is used to throttle the refrigerant. The throttling device can be a single throttling element or a group of multiple throttling elements. It can have multiple connection ports. The throttling element can be an electronic expansion valve or a thermostatic expansion valve. The electronic expansion valve and the thermostatic expansion valve mentioned here are only examples and are not intended to limit this application. Other types are also possible.

[0069] 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, which are connected to each other. For example, the outdoor heat exchanger 12 is a finned heat exchanger. The finned heat exchanger mentioned here is only an example and is not intended to limit this application. Other types are also possible.

[0070] The hot water heat exchanger 13 is used to achieve heat exchange between refrigerant and water to produce domestic hot water. The hot water heat exchanger 13 includes a third refrigerant port 131 and a fourth refrigerant port 132, and the third refrigerant port 131 and the fourth refrigerant port 132 are connected. For example, the hot water heat exchanger 13 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.

[0071] The high-pressure gas-liquid separator 14 is used to separate gaseous refrigerant and liquid refrigerant. The high-pressure gas-liquid separator 14 includes a first refrigerant inlet 141 and a liquid refrigerant outlet 142. The liquid refrigerant outlet 142 is connected to the first refrigerant inlet 141 and is used to output the liquid refrigerant after gas-liquid separation.

[0072] The throttling device includes a first throttling valve 21. The connection relationship of the heat pump system with defrosting mode is as follows: the outlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12; the second refrigerant port 122 of the outdoor heat exchanger 12 is connected to the first end of the throttling device (specifically the first throttling valve 21); the second end of the throttling device (specifically the first throttling valve 21) is connected to the third refrigerant port 131 of the hot water heat exchanger 13 via the first pipeline 16; the other end of the second end of the throttling device (specifically the first throttling valve 21) is connected to the third refrigerant port 131 of the hot water heat exchanger 13 via the first valve 15, the liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14, and the first refrigerant inlet 141; the fourth refrigerant port 132 of the hot water heat exchanger 13 is connected to the inlet of the compressor 11 via the second pipeline 17.

[0073] This embodiment connects the first pipe 16 between the second end of the throttling device (specifically the first throttling valve 21) and the third refrigerant port 131 of the hot water heat exchanger 13, and connects the second pipe 17 between the fourth refrigerant port 132 of the hot water heat exchanger 13 and the inlet of the compressor 11, thereby forming a defrosting circulation loop of the compressor 11, the outdoor heat exchanger 12, and the hot water heat exchanger 13. The refrigerant absorbs the heat from the domestic hot water in the hot water heat exchanger 13, thereby achieving defrosting of the outdoor heat exchanger 12. This solves the problem of the impact on the air conditioning terminal in the previous defrosting mode, and uses domestic hot water for defrosting in winter, improving the user experience during winter heating.

[0074] like Figure 2 As shown, when the heat pump system is in defrosting mode, the refrigerant enters the outdoor heat exchanger 12 from the compressor 11 (the refrigerant releases heat during condensation to achieve defrosting), then enters the hot water heat exchanger through the throttling device (specifically the first throttling valve 21) and the first pipeline 16 (the refrigerant absorbs heat from the domestic hot water), and finally returns to the inlet of the compressor 11 through the second pipeline 17.

[0075] Because of the presence of the high-pressure gas-liquid separator 14, this application requires connecting the first pipeline 16 and installing the first valve 15 between the liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14 and the third refrigerant port 131 of the hot water heat exchanger 13. Otherwise, it would be necessary to wait for the refrigerant to fill the high-pressure gas-liquid separator 14 before it can flow back to the hot water heat exchanger 13. Figure 3 As shown, when the heat pump system is in defrost mode without the first pipe 16 and the first valve 15, refrigerant enters the outdoor heat exchanger 12 from the compressor 11, passes through the throttling device (specifically the first throttling valve 21) and enters the liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14. After the high-pressure gas-liquid separator 14 is full, the liquid refrigerant exits from the first refrigerant inlet 141 of the high-pressure gas-liquid separator 14 and enters the hot water heat exchanger 13, finally returning to the inlet of the compressor 11 via the second pipe 17. This will cause a large accumulation of refrigerant in the high-pressure gas-liquid separator 14, which not only makes the heat pump system unstable, but also prevents the refrigerant from flowing back to the hot water heat exchanger 13 in time to obtain heat for defrosting, resulting in a slow defrosting speed, or the refrigerant cannot flow back to the hot water heat exchanger 13 through the high-pressure gas-liquid separator 14, thus failing to achieve defrosting of domestic hot water.

[0076] It should be noted that the first refrigerant inlet 141 and the liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14 are for various modes of this application. When there is no first pipeline 16 and the first valve 15, the first refrigerant inlet 141 and the liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14 are two refrigerant ports, without distinguishing between inlet and outlet.

[0077] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a second valve 18 and a third valve 19, with the second valve 18 located on the first pipeline 16 and the third valve 19 located on the second pipeline 17.

[0078] In some embodiments, such as Figure 1 As shown, the first valve 15 is a one-way valve or a switching valve, with the one-way valve's conduction direction facing the second end of the throttling device (specifically, the first throttling valve 21). It should be noted that the orientation of the one-way valve refers to the direction of refrigerant flow, not its spatial orientation. The one-way valve or the closed switching valve prevents refrigerant from entering the high-pressure gas-liquid separator 14 via the outdoor heat exchanger 12 during defrosting, thus preventing system instability during defrosting. And / or, in some embodiments, the second valve 18 and the third valve 19 are switching valves, such as solenoid valves. The solenoid valve mentioned here is merely an example and not intended to limit this application; other types are also possible.

[0079] In some embodiments, such as Figure 1 As shown, the throttling device includes a first throttling valve 21; the connection relationship of the heat pump system with defrosting mode and pure hot water mode is as follows: the outlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12; the second refrigerant port 122 of the outdoor heat exchanger 12 is connected to the first end of the throttling device (specifically the first throttling valve 21, hereinafter the same); the second end of the throttling device (specifically the first throttling valve 21) is connected to the third refrigerant port 131 of the hot water heat exchanger 13 via the first pipeline 16, and the throttling device (specifically the first throttling valve 21) is connected to the third refrigerant port 131 of the hot water heat exchanger 13. The second end of the first throttle valve 21 is connected to the third refrigerant port 131 of the hot water heat exchanger 13 via the first valve 15, the liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14, and the first refrigerant inlet 141. The fourth refrigerant port 132 of the hot water heat exchanger 13 is connected to the inlet of the compressor 11 via the second pipeline 17. The fourth refrigerant port 132 of the hot water heat exchanger 13 is also connected to the outlet of the compressor 11, and the first refrigerant port 121 of the outdoor heat exchanger 12 is also connected to the inlet of the compressor 11.

[0080] like Figure 4 As shown, the first connection in the pure hot water mode is: the refrigerant enters the hot water heat exchanger 13 from the compressor 11 (for releasing heat and exchanging heat with water to prepare domestic hot water), then enters the outdoor heat exchanger 12 through the first pipeline 16 and the throttling device (specifically the first throttling valve 21) to evaporate and absorb heat, and finally returns to the inlet of the compressor 11.

[0081] like Figure 5 As shown, the second connection relationship in the pure hot water mode is as follows: the refrigerant enters the hot water heat exchanger 13 from the compressor 11 (used for heat release and heat exchange with water to prepare domestic hot water), and then enters the outdoor heat exchanger 12 through the first refrigerant inlet 141 and the liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14 to evaporate and absorb heat, and finally returns to the inlet of the compressor 11.

[0082] In some embodiments, such as Figure 1 As shown, the high-pressure gas-liquid separator 14 further includes a first gaseous refrigerant outlet 143, which is connected to the first refrigerant inlet 141. The heat pump system also includes an indoor unit 20, which is used to achieve heat exchange between the refrigerant and indoor air. The indoor unit 20 includes a fifth refrigerant port 201 and a sixth refrigerant port 202, which are connected to each other.

[0083] Among them, such as Figure 1As shown, the throttling device includes a first throttling valve 21; the connection relationship of the heat pump system having defrosting mode and cooling and total heat recovery domestic hot water production mode is as follows: the outlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12; the second refrigerant port 122 of the outdoor heat exchanger 12 is connected to the first end of the throttling device (specifically the first throttling valve 21, the same below); the second end of the throttling device (specifically the first throttling valve 21) is connected via the first pipeline 16 to the third refrigerant port 131 of the hot water heat exchanger 13, and the other end of the throttling device (specifically the first throttling valve 21) is connected via... The first valve 15 and the liquid refrigerant outlet 142 and the first refrigerant inlet 141 of the high-pressure gas-liquid separator 14 are connected to the third refrigerant port 131 of the hot water heat exchanger 13; the fourth refrigerant port 132 of the hot water heat exchanger 13 is connected to the inlet of the compressor 11 via the second pipeline 17; the fourth refrigerant port 132 of the hot water heat exchanger 13 is also connected to the outlet of the compressor 11; the sixth refrigerant port 202 of the indoor unit 20 is connected to the first end of the throttling device (specifically the first throttling valve 21); and the fifth refrigerant port 201 of the indoor unit 20 is connected to the inlet of the compressor 11.

[0084] like Figure 6 As shown, the connection between the refrigeration and total heat recovery domestic hot water production modes is as follows: the refrigerant enters the hot water heat exchanger 13 from the compressor 11 (used for total heat recovery of the refrigerant to produce domestic hot water), then enters the indoor unit 20 for evaporation and heat absorption through the first refrigerant inlet 141 and the liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14, and the throttling device (specifically the first throttling valve 21), and finally returns to the inlet of the compressor 11.

[0085] like Figure 1As shown, the throttling device includes a first throttling valve 21 and a fourth throttling valve 29. The connection relationship of the heat pump system with defrosting mode and refrigeration plus waste heat recovery to produce domestic hot water mode is as follows: the outlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12; the second refrigerant port 122 of the outdoor heat exchanger 12 is connected to the first end of the throttling device (specifically the first throttling valve 21); the second end of the throttling device (specifically the first throttling valve 21) is connected via the first pipeline 16 to the third refrigerant port 131 of the hot water heat exchanger 13, and the other end of the throttling device (specifically the first throttling valve 21) is connected via the first valve 15 and the liquid refrigerant outlet 142 and the first refrigerant inlet 141 of the high-pressure gas-liquid separator 14 to the hot water heat exchanger 13. The third refrigerant port 131 of the heat exchanger 13 is connected; the fourth refrigerant port 132 of the hot water heat exchanger 13 is connected to the inlet of the compressor 11 via the second pipeline 17; the fourth refrigerant port 132 of the hot water heat exchanger 13 is also connected to the outlet of the compressor 11; the third refrigerant port 131 of the hot water heat exchanger 13 is also connected to the first refrigerant port 121 of the outdoor heat exchanger 12 via the first refrigerant inlet 141 and the first gaseous refrigerant outlet 143 of the high-pressure gas-liquid separator 14; the second refrigerant port 122 of the outdoor heat exchanger 12 is also connected to the sixth refrigerant port 202 of the indoor unit 20 via the throttling device (specifically the fourth throttling valve 29); and the fifth refrigerant port 201 of the indoor unit 20 is connected to the inlet of the compressor 11.

[0086] like Figure 7 As shown, the connection relationship of the cooling plus waste heat recovery mode for producing domestic hot water is as follows: the refrigerant enters the hot water heat exchanger 13 from the compressor 11 (used to recover waste heat from the refrigerant to produce domestic hot water), then enters the outdoor heat exchanger 12 through the first refrigerant inlet 141 and the first gaseous refrigerant outlet 143 of the high-pressure gas-liquid separator 14 to condense and release heat, then enters the indoor unit 20 through the throttling device (specifically the fourth throttling valve 29) to evaporate and absorb heat, and finally returns to the inlet of the compressor 11.

[0087] like Figure 1As shown, the throttling device includes a first throttling valve 21 and a second throttling valve 22. The connection relationship of the heat pump system with defrosting mode and heating plus domestic hot water mode is as follows: the outlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12; the second refrigerant port 122 of the outdoor heat exchanger 12 is connected to the first end of the throttling device (specifically the first throttling valve 21); the second end of the throttling device (specifically the first throttling valve 21) is connected via the first pipeline 16 to the third refrigerant port 131 of the hot water heat exchanger 13, and the other end of the throttling device (specifically the first throttling valve 21) is connected via the first valve 15 and the liquid refrigerant outlet 142 and the first refrigerant inlet 141 of the high-pressure gas-liquid separator 14 to the hot water heat exchanger 13. The third refrigerant port 131 of the hot water heat exchanger 13 is connected to the inlet of the compressor 11 via the second pipeline 17; the fourth refrigerant port 132 of the hot water heat exchanger 13 is also connected to the outlet of the compressor 11; the third refrigerant port 131 of the hot water heat exchanger 13 is also connected to the fifth refrigerant port 201 of the indoor unit 20 via the first refrigerant inlet 141 and the first gaseous refrigerant outlet 143 of the high-pressure gas-liquid separator 14; the second refrigerant port 122 of the outdoor heat exchanger 12 is also connected to the sixth refrigerant port 202 of the indoor unit 20 via the throttling device (specifically the second throttling valve 22); and the first refrigerant port 121 of the outdoor heat exchanger 12 is also connected to the inlet of the compressor 11.

[0088] like Figure 9 As shown, the connection relationship of the heating and domestic hot water mode is as follows: the refrigerant enters the hot water heat exchanger 13 from the compressor 11 (used for heat release and heat exchange with water to prepare domestic hot water), then enters the indoor unit 20 for condensation and heat release through the first refrigerant inlet 141 and the first gaseous refrigerant outlet 143 of the high-pressure gas-liquid separator 14, then enters the outdoor heat exchanger 12 for evaporation and heat absorption through the throttling device (specifically the second throttling valve 22), and finally returns to the inlet of the compressor 11.

[0089] like Figure 1As shown, the throttling device includes a first throttling valve 21 and a fourth throttling valve 29; the connection relationship of the heat pump system with defrosting mode and cooling mode is as follows: the outlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12; the second refrigerant port 122 of the outdoor heat exchanger 12 is connected to the first end of the throttling device (specifically the first throttling valve 21); the second end of the throttling device (specifically the first throttling valve 21) is connected to the third refrigerant port 131 of the hot water heat exchanger 13 via the first pipeline 16; the fourth end of the throttling device (specifically the first throttling valve 29) is connected to the first refrigerant port 131 of the hot water heat exchanger 13. The other end is connected via the first valve 15 and the liquid refrigerant outlet 142 and the first refrigerant inlet 141 of the high-pressure gas-liquid separator 14 to the third refrigerant port 131 of the hot water heat exchanger 13; the fourth refrigerant port 132 of the hot water heat exchanger 13 is connected to the inlet of the compressor 11 via the second pipeline 17; the second refrigerant port 122 of the outdoor heat exchanger 12 is also connected to the sixth refrigerant port 202 of the indoor unit 20 via the throttling device (specifically the fourth throttling valve 29); and the fifth refrigerant port 201 of the indoor unit 20 is connected to the inlet of the compressor 11.

[0090] like Figure 11 As shown, the connection relationship of the cooling mode is as follows: the refrigerant enters the outdoor heat exchanger 12 from the compressor 11 to condense and release heat, enters the indoor unit 20 through the throttling device (specifically the fourth throttling valve 29) to evaporate and absorb heat, and finally returns to the inlet of the compressor 11.

[0091] like Figure 1As shown, the throttling device includes a first throttling valve 21 and a second throttling valve 22; the connection relationship of the heat pump system with defrosting mode and heating mode is as follows: the outlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12; the second refrigerant port 122 of the outdoor heat exchanger 12 is connected to the first end of the throttling device (specifically the first throttling valve 21); the second end of the throttling device (specifically the first throttling valve 21) is connected via the first pipeline 16 to the third refrigerant port 131 of the hot water heat exchanger 13, and the other end of the second end of the throttling device (specifically the first throttling valve 21) is connected via the first valve 15 and the high-temperature... The liquid refrigerant outlet 142 and the first refrigerant inlet 141 of the gas-liquid separator 14 are connected to the third refrigerant port 131 of the hot water heat exchanger 13; the fourth refrigerant port 132 of the hot water heat exchanger 13 is connected to the inlet of the compressor 11 via the second pipeline 17; the fifth refrigerant port 201 of the indoor unit 20 is connected to the outlet of the compressor 11; the second refrigerant port 122 of the outdoor heat exchanger 12 is also connected to the sixth refrigerant port 202 of the indoor unit 20 via the throttling device (specifically the second throttling valve 22); and the first refrigerant port 121 of the outdoor heat exchanger 12 is also connected to the inlet of the compressor 11.

[0092] like Figure 12 As shown, the connection relationship of the heating mode is as follows: the refrigerant enters the indoor unit 20 from the compressor 11 to condense and release heat, enters the outdoor heat exchanger 12 through the throttling device (specifically the second throttling valve 22) to evaporate and absorb heat, and finally returns to the inlet of the compressor 11.

[0093] like Figure 1 As shown, the connection relationships of the heat pump system having defrosting mode, pure hot water mode, cooling and total heat recovery domestic hot water production mode, cooling plus waste heat recovery domestic hot water production mode, heating plus domestic hot water mode, cooling mode, and heating mode are as follows:

[0094] The outlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12, the fifth refrigerant port 201 of the indoor unit 20, and the fourth refrigerant port 132 of the hot water heat exchanger 13. One path of the second refrigerant port 122 of the outdoor heat exchanger 12 is connected to the first end of the first throttle valve 21, and another path of the second refrigerant port 122 of the outdoor heat exchanger 12 is connected to the sixth refrigerant port 202 of the indoor unit 20 via the second throttle valve 22. The sixth refrigerant port 202 of the indoor unit 20 is also connected to the first end of the first throttle valve 21. One path of the second end of the first throttle valve 21 is connected to the third refrigerant port 131 of the hot water heat exchanger 13 via the first pipe 16. The second end of the first throttle valve 21 is connected via the first valve 15, the liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14, and the first refrigerant inlet 141 to the third refrigerant port 131 of the hot water heat exchanger 13; the first gaseous refrigerant outlet 143 of the high-pressure gas-liquid separator 14 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12 and the fifth refrigerant port 201 of the indoor unit 20; the fourth refrigerant port 132 of the hot water heat exchanger 13 is connected to the inlet of the compressor 11 via the second pipeline 17; the first refrigerant port 121 of the outdoor heat exchanger 12 and the fifth refrigerant port 201 of the indoor unit 20 are also connected to the inlet of the compressor 11.

[0095] It should be noted that the heat pump system may have at least one of the following modes: defrosting mode, pure hot water mode, cooling and total heat recovery for domestic hot water mode, cooling plus waste heat recovery for domestic hot water mode, heating plus domestic hot water mode, cooling mode, and heating mode. That is, the connection relationships between these modes can be arbitrarily combined. In actual operation, the heat pump system can select one of these modes to operate.

[0096] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a heat recovery branch 23 and a low-pressure gas-liquid separator 24. The low-pressure gas-liquid separator 24 is used to separate gaseous refrigerant and liquid refrigerant. The low-pressure gas-liquid separator 24 includes a second refrigerant inlet 241 and a second gaseous refrigerant outlet 242. The second refrigerant inlet 241 is connected to the second gaseous refrigerant outlet 242.

[0097] The fourth refrigerant port 132 of the hot water heat exchanger 13 is connected to the second refrigerant inlet 241 of the low-pressure gas-liquid separator 24 via the second pipeline 17. The liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14 is connected to the second refrigerant inlet 241 of the low-pressure gas-liquid separator 24 via the heat recovery branch 23. The second gaseous refrigerant outlet 242 of the low-pressure gas-liquid separator 24 is connected to the inlet of the compressor 11.

[0098] In this embodiment, by setting the heat recovery branch 23 between the liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14 and the second refrigerant inlet 241 of the low-pressure gas-liquid separator 24, the oil accumulated in the high-pressure gas-liquid separator 14 can be returned, and the refrigerant that has migrated into the high-pressure gas-liquid separator 14 can be released for pressure relief, thereby improving the pressure balance of the system.

[0099] When the heat pump system includes the hot water heat exchanger 13, the system has multiple operating modes (see below for details). The high-pressure gas-liquid separator 14 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 plus 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 14. Therefore, in the triple heat pump system with the hot water heat exchanger 13 and the high-pressure gas-liquid separator 14, adding the heat recovery branch 23 is crucial for the oil return and pressure stability of the triple heat pump system.

[0100] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a branch valve 25, which is located on the heat recovery branch 23. Depending on the system operation, the branch valve 25 is opened to return oil or adjust the system pressure balance. For example, the branch valve 25 may be a solenoid valve. This example of a solenoid valve is merely illustrative and not intended to limit the scope of this application; other types of valves may also be used.

[0101] It should be noted that the branch valve 25 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 25 can be opened according to the system conditions, such as refrigerant migration, system pressure, and the oil return requirements of the compressor 11.

[0102] In the cooling and total heat recovery domestic hot water mode or pure hot water mode, the refrigerant coming out of the high-pressure gas-liquid separator 14 is in liquid state, and the branch valve 25 in the heat recovery branch 23 is not open.

[0103] In the cooling plus waste heat recovery for domestic hot water production mode or the heating plus domestic hot water production mode, the refrigerant coming out of the high-pressure gas-liquid separator 14 is in a gaseous state. If there is oil accumulation in the high-pressure gas-liquid separator 14 or if there is migrating refrigerant, the branch valve 25 in the heat recovery branch 23 can be opened.

[0104] In heating or cooling mode, the refrigerant does not pass through the high-pressure gas-liquid separator 14.

[0105] In some embodiments, at least a portion of the heat recovery branch 23 is a capillary, i.e. Figure 1 As shown in Figure 231, 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 24, preventing excessive refrigerant leakage into the low-pressure gas-liquid separator 24 after the branch valve 25 is opened. And / or, in some other embodiments, at least a portion of the pipeline of the liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14 is a capillary tube 26, i.e. Figure 1 As shown in 26. It can be understood that at least part can be partial or all.

[0106] In some embodiments, such as Figure 1 As shown, the heat pump system also includes an economizer 27 and a third throttle valve 28. The economizer 27 includes a seventh refrigerant port 271, an eighth refrigerant port 272, a ninth refrigerant port 273, and a tenth refrigerant port 274.

[0107] Specifically, the seventh refrigerant port 271 of the economizer 27 is connected to the sixth refrigerant port 202 of the indoor unit 20; the seventh refrigerant port 271 of the economizer 27 is connected to the eighth refrigerant port 272 of the economizer 27 to form an enthalpy-increasing main circuit; one path of the eighth refrigerant port 272 of the economizer 27 is connected to the second refrigerant port 122 of the outdoor heat exchanger 12, and the other path of the eighth refrigerant port 272 of the economizer 27 is connected to the second refrigerant port 122 of the outdoor heat exchanger 12 via the throttling device (specifically the second throttling valve 22).

[0108] The first end of the third throttle valve 28 is connected to the pipeline between the seventh refrigerant port 271 of the economizer 27 and the sixth refrigerant port 202 of the indoor unit 20. The second end of the third throttle valve 28 is connected to the tenth refrigerant port 274 of the economizer 27 via the ninth refrigerant port 273 to form an enthalpy-increasing auxiliary circuit. The tenth refrigerant port 274 of the economizer 27 is connected to the inlet of the compressor 11.

[0109] The heat pump system in this embodiment, by installing the economizer 27 and the third throttling valve 28 at the outlet of the outdoor heat exchanger 12, allows the refrigerant from the outdoor heat exchanger 12 to enter the indoor unit 20 via the enthalpy-increasing main path and the compressor 11 via the enthalpy-increasing auxiliary path. After the refrigerant is throttled and cooled by the third throttling valve 28 in the enthalpy-increasing auxiliary path, it can more efficiently absorb heat from the refrigerant in the enthalpy-increasing main path in the economizer 27. After absorbing heat, the refrigerant vaporizes and enters the compressor 11. At the same time, the subcooling of the refrigerant after releasing heat in the enthalpy-increasing main path is increased, and the temperature of the refrigerant entering the indoor unit 20 is lower, thereby improving the cooling effect.

[0110] For example, the third throttle valve 28 is an electronic expansion valve or a thermostatic expansion valve. The electronic expansion valve and the thermostatic expansion valve mentioned here are just examples and are not intended to limit this application. Other valves are also possible.

[0111] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a fourth throttle valve 29 corresponding to each indoor unit 20, and the fourth throttle valve 29 is located on the sixth refrigerant port 202 pipe of the indoor unit 20.

[0112] In some embodiments, such as Figure 1 As shown, the sixth refrigerant port 202 of the indoor unit 20 is connected to the seventh refrigerant port 271 of the economizer 27 and the first end of the third throttle valve 28 via the fourth throttle valve 29. Since the subcooling degree of the refrigerant after heat release through the enthalpy-increasing main circuit is increased, the temperature of the refrigerant entering the indoor unit 20 is lower, thereby reducing the throttling noise of the fourth throttle valve 29 during cooling.

[0113] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a fourth valve 30 and a fifth valve 31. The compressor 11 includes an enthalpy-increasing port 111. One of the tenth refrigerant ports 274 of the economizer 27 is connected to the inlet of the compressor 11 via the fourth valve 30, and the other of the tenth refrigerant ports 274 of the economizer 27 is connected to the enthalpy-increasing port 111 of the compressor 11 via the fifth valve 31.

[0114] For example, the fourth valve 30 and the fifth valve 31 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.

[0115] The heat pump system of this embodiment, by installing the economizer 27 and the third throttling valve 28 at the outlet of the indoor unit 20, allows the refrigerant from the indoor unit 20 to enter the outdoor heat exchanger 12 via the enthalpy-increasing main path and the compressor 11 via the enthalpy-increasing auxiliary path. After being throttled and cooled by the third throttling valve 28 in the enthalpy-increasing auxiliary path, the refrigerant can more efficiently absorb heat from the enthalpy-increasing main path in the economizer 27. After absorbing heat, the refrigerant vaporizes and enters the compressor 11 via the enthalpy-increasing port 111, thereby improving the performance of the compressor 11. Simultaneously, the subcooling of the refrigerant after releasing heat through the enthalpy-increasing main path is increased, resulting in a lower temperature of the refrigerant entering the outdoor heat exchanger 12. Especially in cold winters, this allows the refrigerant temperature to 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.

[0116] Specifically, in the cooling and total heat recovery domestic hot water mode, the refrigerant from the compressor 11 is divided into two paths after passing through the hot water heat exchanger 13, the high-pressure gas-liquid separator 14, and the enthalpy-increasing main path. One path returns to the inlet of the compressor 11 through the indoor unit 20, and the other path returns to the inlet of the compressor 11 through the enthalpy-increasing auxiliary path and the fourth valve 30. At the same time, all the heat (sensible heat and latent heat) of the refrigerant is exchanged in the hot water heat exchanger 13.

[0117] In the domestic hot water production mode of refrigeration plus waste heat recovery, the refrigerant from the compressor 11 is divided into two paths after passing through the hot water heat exchanger 13, the high-pressure gas-liquid separator 14, the outdoor heat exchanger 12, and the enthalpy-increasing main path. One path returns to the inlet of the compressor 11 through the indoor unit 20, and the other path returns to the inlet of the compressor 11 through the enthalpy-increasing auxiliary path and the fourth valve 30. At the same time, part of the heat (sensible heat) of the refrigerant is exchanged in the hot water heat exchanger 13.

[0118] In the heating and domestic hot water mode, the refrigerant from the compressor 11 is divided into two paths after passing through the hot water heat exchanger 13, the high-pressure gas-liquid separator 14, and the indoor unit 20. One path returns to the inlet of the compressor 11 via the enthalpy-increasing main path and the outdoor heat exchanger 12, while the other path returns to the enthalpy-increasing port 111 of the compressor 11 via the enthalpy-increasing auxiliary path and the fifth valve 31. At the same time, part of the heat of the refrigerant is exchanged in the hot water heat exchanger 13.

[0119] In cooling mode, the refrigerant from the compressor 11 is split into two paths after passing through the outdoor heat exchanger 12 and the enthalpy-increasing main path. One path returns to the inlet of the compressor 11 via the indoor unit 20, and the other path returns to the inlet of the compressor 11 via the enthalpy-increasing auxiliary path and the fourth valve 30.

[0120] In heating mode, the refrigerant is split into two paths after passing through the compressor 11 and the indoor unit 20. One path returns to the inlet of the compressor 11 via the enthalpy-increasing main path and the outdoor heat exchanger 12, while the other path returns to the enthalpy-increasing port 111 of the compressor 11 via the enthalpy-increasing auxiliary path and the fifth valve 31.

[0121] It should be noted that "all the heat is exchanged in the hot water heat exchanger 13" means that the refrigerant is completely formed into liquid refrigerant after heat exchange in the hot water heat exchanger 13, while "part of the heat is exchanged in the hot water heat exchanger 13" means that the refrigerant is formed into gaseous refrigerant after heat exchange in the hot water heat exchanger 13.

[0122] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a sixth valve 32. One of the second refrigerant ports 122 of the outdoor heat exchanger 12 is connected to the sixth refrigerant port 202 of the indoor unit 20 (specifically, the eighth refrigerant port 272 of the economizer 27) via the second throttle valve 22. The other of the second refrigerant ports 122 of the outdoor heat exchanger 12 is connected to the sixth refrigerant port 202 of the indoor unit 20 (specifically, the eighth refrigerant port 272 of the economizer 27) via the sixth valve 32.

[0123] In some embodiments, the sixth valve 32 is a one-way valve, and the flow direction of the one-way valve is towards the sixth refrigerant port 202 of the indoor unit 20. It should be noted that the orientation of the one-way valve refers to the direction of refrigerant flow, not its spatial orientation. In other embodiments, the sixth valve 32 is a switch valve, which opens during defrosting mode, cooling mode, and cooling plus waste heat recovery for domestic hot water production mode.

[0124] In some embodiments, such as Figure 1 As shown, the heat pump system further includes a first reversing valve 33. The outlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12 and / or the fifth refrigerant port 201 of the indoor unit 20 through the first reversing valve 33. The first gaseous refrigerant outlet 143 of the high-pressure gas-liquid separator 14 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12 and / or the fifth refrigerant port 201 of the indoor unit 20 through the first reversing valve 33.

[0125] The first reversing valve 33 includes a first valve port 331, a second valve port 332, and a third valve port 333. The first valve port 331 of the first reversing valve 33 is connected to the first gaseous refrigerant outlet 143 of the high-pressure gas-liquid separator 14. The second valve port 332 of the first reversing valve 33 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12 and / or the fifth refrigerant port 201 of the indoor unit 20. The third valve port 333 of the first reversing valve 33 is connected to the outlet of the compressor 11. For example, the first reversing valve 33 may be 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.

[0126] When the cooling plus waste heat recovery for domestic hot water production mode and the heating plus domestic hot water production mode are in operation, the first valve port 331 of the first reversing valve 33 is connected to the second valve port 332.

[0127] When in cooling mode, heating mode, or hot water defrosting mode, the third valve port 333 of the first reversing valve 33 is connected to the second valve port 332.

[0128] Understandably, when it is necessary to adjust the amount of refrigerant entering the hot water heat exchanger 13 in the cooling plus waste heat recovery domestic hot water mode and the heating plus domestic hot water mode, the third valve port 333 of the first reversing valve 33 can be connected to the second valve port 332.

[0129] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a seventh valve 34. One outlet of the compressor 11 is connected via the seventh valve 34 to the fourth refrigerant port 132 of the hot water heat exchanger 13. The other outlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12 and / or the fifth refrigerant port 201 of the indoor unit 20 (specifically connected to the third valve port 333 of the first reversing valve 33). When domestic hot water needs to be prepared, the seventh valve 34 can be opened. For example, the seventh valve 34 is an on / off valve.

[0130] In some embodiments, such as Figure 1As shown, the heat pump system further includes a second reversing valve 35. The outlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12 and / or the fifth refrigerant port 201 of the indoor unit 20 via the first reversing valve 33 and the second reversing valve 35. The inlet of the compressor 11 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12 and / or the fifth refrigerant port 201 of the indoor unit 20 via the second reversing valve 35. The third refrigerant port 131 of the hot water heat exchanger 13 is connected to the first refrigerant inlet 141 and the first gaseous refrigerant outlet 143 of the high-pressure gas-liquid separator 14, the first reversing valve 33 and the second reversing valve 35, and is connected to the first refrigerant port 121 of the outdoor heat exchanger 12 and / or the fifth refrigerant port 201 of the indoor unit 20.

[0131] The second reversing valve 35 includes a fourth valve port 351, a fifth valve port 352, a sixth valve port 353, and a seventh valve port 354. The fourth valve port 351 of the second reversing valve 35 is connected to the outlet of the compressor 11 (specifically, the second valve port 332 of the first reversing valve 33). The fifth valve port 352 of the second reversing valve 35 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12. The sixth valve port 353 of the second reversing valve 35 is connected to the inlet of the compressor 11. The seventh valve port 354 of the second reversing valve 35 is connected to the fifth refrigerant port 201 of the indoor unit 20. For example, the second reversing valve 35 may be a four-way valve. This four-way valve is merely an example and is not intended to limit the scope of this application; other valves are also possible.

[0132] When in the cooling and total heat recovery domestic hot water mode, the seventh valve port 354 of the second reversing valve 35 is connected to the sixth valve port 353.

[0133] When the second reversing valve 35 is in the domestic hot water mode with cooling and waste heat recovery, in the cooling mode, and in the hot water defrosting mode, the fourth valve port 351 of the second reversing valve 35 is connected to the fifth valve port 352, and the seventh valve port 354 of the second reversing valve 35 is connected to the sixth valve port 353.

[0134] In both heating and domestic hot water modes and in heating mode, the fourth valve port 351 of the second reversing valve 35 is connected to the seventh valve port 354, and the fifth valve port 352 of the second reversing valve 35 is connected to the sixth valve port 353.

[0135] When in pure hot water mode, the fifth valve port 352 of the second reversing valve 35 is connected to the sixth valve port 353.

[0136] In some embodiments, such as Figure 1 As shown, the hot water heat exchanger 13 further includes a first water inlet 133 and a first water outlet 134, with the first water inlet 133 and the first water outlet 134 connected together. The heat pump system also includes a domestic water tank 36, which includes a cold water inlet 361, a first water outlet 362, a first water return outlet 363, and a hot water outlet 364. The first water outlet 362 of the domestic water tank 36 is connected to the first water inlet 133 of the hot water heat exchanger 13, and the first water outlet 134 of the hot water heat exchanger 13 is connected to the first water return outlet 363 of the domestic water tank 36.

[0137] In some embodiments, such as Figure 1 As shown, the heat pump system further includes a first water pump 37, which is installed in the inlet pipe (i.e., the pipe connecting the first outlet 362 of the domestic water tank 36 to the first water inlet 133 of the hot water heat exchanger 13) or the outlet pipe (i.e., the pipe connecting the first water outlet 134 of the hot water heat exchanger 13 to the first return water inlet 363 of the domestic water tank 36). The first water pump 37 is used to provide power for the water circulation between the hot water heat exchanger 13 and the domestic water tank 36.

[0138] In some embodiments, the hot water heat exchanger 13, the domestic water tank 36, and the first water pump 37 can be integrated into a domestic hot water module, which can be assembled by the user according to actual needs.

[0139] In some embodiments, such as Figure 1 As shown, the heat pump system includes at least one indoor unit 20. Understandably, at least one unit can be one, two, three, or any number of units. The heat pump system also includes a gas pipe 38 and a liquid pipe 39. The second refrigerant port 122 of the outdoor heat exchanger 12 is connected to the main interface of the liquid pipe 39. The sixth refrigerant port 202 of the indoor unit 20 is connected to the corresponding branch interface of the liquid pipe 39. The fifth refrigerant port 201 of the indoor unit 20 is connected to the corresponding branch interface of the gas pipe 38. The main interface of the gas pipe 38 is connected to the outlet of the compressor 11 and / or the inlet of the compressor.

[0140] For example, the indoor unit 20 is a ducted air conditioner, which includes an indoor heat exchanger and a fan. The indoor heat exchanger is a finned heat exchanger. The finned heat exchanger and the ducted air conditioner mentioned here are just examples and are not intended to limit this application. They could also be other types.

[0141] In some embodiments, such as Figure 1As shown, the heat pump system also includes an eighth valve 40, a ninth valve 41, a tenth valve 42, and an eleventh valve 43. The eighth valve 40 is located on the pipeline between the seventh valve 34 and the fourth refrigerant port 132 of the hot water heat exchanger 13. The ninth valve 41 is located on the pipeline between the third refrigerant port 131 of the hot water heat exchanger 13 and the first refrigerant inlet 141 of the high-pressure gas-liquid separator 14. One end of the tenth valve 42 is connected to the second refrigerant port 122 of the outdoor heat exchanger 12, and the other end of the tenth valve 42 is connected to the sixth refrigerant port 202 of the indoor unit 20. Specifically, one end of the tenth valve 42 is connected to the seventh refrigerant port 271 of the economizer 27 and the first end of the third throttle valve 28, and the other end of the tenth valve 42 is connected to the main interface end of the liquid pipe 39. One end of the eleventh valve 43 is connected to the outlet and / or inlet of the compressor 11, and the other end of the eleventh valve 43 is connected to the fifth refrigerant port 201 of the indoor unit 20. Specifically, one end of the eleventh valve 43 is connected to the seventh valve port 354 of the second reversing valve 35, and the other end of the eleventh valve 43 is connected to the main interface end of the gas pipe 38.

[0142] For example, the eighth valve 40, the ninth valve 41, the tenth valve 42, and the eleventh valve 43 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.

[0143] In some embodiments, such as Figure 1 As shown, the heat pump system also includes an oil separator 44 and an oil return pipe 45. The oil separator 44 is located at the outlet end of the compressor 11. The oil separator 44 is used to separate the lubricating oil from the compressor 11 that is mixed in the refrigerant and return it to the compressor 11 through the oil return pipe 45.

[0144] In some embodiments, the heat pump system further includes a fresh air module (not shown in the figure), which is provided for each indoor unit 20 and is used to introduce fresh outdoor air and exhaust stale indoor air.

[0145] In some embodiments, the compressor 11, the outdoor heat exchanger 12, the high-pressure gas-liquid separator 14, the low-pressure gas-liquid separator 24, the first reversing valve 33, the seventh valve 34, the second reversing valve 35, the first throttle valve 21, the third throttle valve 28, the economizer 27, the fourth valve 30, the fifth valve 31, the second throttle valve 22, the sixth valve 32, the oil separator 44, the oil return pipe 45, the eighth valve 40, the ninth valve 41, the tenth valve 42, and the eleventh valve 43 are all integrated into the outdoor unit. It can be understood that at least one of the eighth valve 40, the ninth valve 41, the tenth valve 42, and the eleventh valve 43 may be located inside or on the outer surface of the outdoor unit.

[0146] In some embodiments, such as Figure 1 As shown, the heat pump system also includes at least one underfloor heating heat exchanger 46. Understandably, at least one can be one, two, three, or any number. The underfloor heating heat exchanger 46 is used to achieve heat exchange between the refrigerant and the heat storage medium for heat storage. The underfloor heating heat exchanger 46 includes a third refrigerant inlet 461 and a refrigerant outlet 462. The third refrigerant inlet 461 is connected to the refrigerant outlet 462. The third refrigerant inlet 461 of the underfloor heating heat exchanger 46 is connected to the outlet of the compressor 11, and the refrigerant outlet 462 of the underfloor heating heat exchanger 46 is connected to the second refrigerant port 122 of the outdoor heat exchanger 12. Specifically, the third refrigerant inlet 461 of the underfloor heating heat exchanger 46 is connected to the corresponding branch end in the gas pipe 38, and the refrigerant outlet 462 of the underfloor heating heat exchanger 46 is connected to the corresponding branch end in the liquid pipe 39.

[0147] For example, the floor heating heat exchanger 46 is a plate heat exchanger. The plate heat exchanger mentioned here is only an example and is not intended to limit this application. Other types are also possible.

[0148] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a floor heating one-way valve 47 corresponding to each of the floor heating heat exchangers 46. The refrigerant outlet 462 of the floor heating heat exchanger 46 is connected to the second refrigerant port 122 of the outdoor heat exchanger 12 via the floor heating one-way valve 47. The conduction direction of the floor heating one-way valve 47 is towards the second refrigerant port 122 of the outdoor heat exchanger 12.

[0149] In this embodiment, a one-way valve 47 is added to the refrigerant outlet 462 of the underfloor heating heat exchanger 46. The one-way valve 47 allows refrigerant to flow from the refrigerant outlet 462 of the underfloor heating heat exchanger 46 to the outdoor heat exchanger 12 in the heating flow direction, while prohibiting reverse refrigerant flow. Therefore, when the heat pump system is operating in cooling mode, the presence of the one-way valve 47 prevents low-temperature refrigerant from entering the underfloor heating heat exchanger 46 from the refrigerant outlet 462, thus completely solving the problem of the underfloor heating heat exchanger 46 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 one-way valve 47 is used to block refrigerant from flowing into the underfloor heating heat exchanger 46. When the heat pump system is in heating mode, the refrigerant flows in from the third refrigerant inlet 461 of the floor heating heat exchanger 46, and flows out after passing through the refrigerant outlet 462 of the floor heating heat exchanger 46 and the floor heating one-way valve 47.

[0150] In some embodiments, such as Figure 1 As shown, the heat pump system also includes a fifth throttling valve 48 corresponding to each of the floor heating heat exchangers 46. The fifth throttling valve 48 is located on the pipeline between the refrigerant outlet 462 of the floor heating heat exchanger 46 and the floor heating one-way valve 47. The fifth throttling valve 48 is used to throttle the refrigerant output from the refrigerant outlet 462 of the floor heating heat exchanger 46.

[0151] For example, the fifth throttle valve 48 is an electronic expansion valve or a thermostatic expansion valve. The electronic expansion valve and the thermostatic expansion valve mentioned here are just examples and are not intended to limit this application. Other valves are also possible.

[0152] In some embodiments, such as Figure 1 As shown, the underfloor heating heat exchanger 46 further includes a second water inlet 463 and a second water outlet 464, which are connected in communication. The heat pump system also includes a terminal 49, which is connected to the second water inlet 463 and the second water outlet 464 of the underfloor heating heat exchanger 46. Specifically, the terminal 49 includes a second water outlet 491 and a second water return outlet 492. The second water outlet 491 of the terminal 49 is connected to the second water inlet 463 of the underfloor heating heat exchanger 46, and the second water outlet 464 of the underfloor heating heat exchanger 46 is connected to the second water return outlet 492 of the terminal 49.

[0153] For example, the terminal 49 may be a ground pipe, which achieves the underfloor heating effect through heat exchange with the underfloor heating heat exchanger 46. If there are multiple ground pipes, a manifold may also be installed at the terminal 49. The ground pipe mentioned here is merely an example and is not intended to limit this application; other types are also possible.

[0154] In some embodiments, such as Figure 1 As shown, the heat pump system further includes a second water pump 50, which is installed in the inlet pipe of the terminal 49 (i.e., the pipe connecting the second outlet 491 of the terminal 49 to the second water inlet 463 of the underfloor heating heat exchanger 46) or the outlet pipe (i.e., the pipe connecting the second water outlet 464 of the underfloor heating heat exchanger 46 to the second return water inlet 492 of the terminal 49). The second water pump 50 is used to provide power for the water circulation between the underfloor heating heat exchanger 46 and the terminal 49.

[0155] In some embodiments, the underfloor heating heat exchanger 46, the underfloor heating one-way valve 47, the fifth throttle valve 48, and the second water pump 50 can be integrated into a single underfloor heating module, which can be installed on the gas pipe 38 and the liquid pipe 39 as needed. Furthermore, the indoor unit 20 and the underfloor heating module can operate selectively or simultaneously.

[0156] In some embodiments, the heat pump system further includes a liquid storage container (not shown), which is provided on the pipeline connecting the second refrigerant port 122 of the outdoor heat exchanger 12 to the sixth refrigerant port 202 of the indoor unit 20. Specifically, the liquid storage container is provided on the pipeline connecting the tenth valve 42 to the seventh refrigerant port 271 of the economizer 27 and the first end of the third throttle valve 28.

[0157] In some embodiments, fully, such as Figure 1 As shown, the connection relationships between the components in the heat pump system are as follows:

[0158] One outlet of the compressor 11 is connected to the first end of the seventh valve 34, and the other outlet of the compressor 11 is connected to the third valve port 333 of the first reversing valve 33. The fourth refrigerant port 132 of the hot water heat exchanger 13 is divided into two paths after passing through the eighth valve 40: one path is connected to the second end of the seventh valve 34, and the other path is connected to the second refrigerant inlet 241 of the low-pressure gas-liquid separator 24 via the second pipeline 17. The third refrigerant port 131 of the hot water heat exchanger 13 is divided into two paths after passing through the ninth valve 41: one path is connected to the first refrigerant inlet 141 of the high-pressure gas-liquid separator 14, and the other path is connected to the second end of the first throttle valve 21 via the first pipeline 16. The first gaseous refrigerant outlet 143 of the high-pressure gas-liquid separator 14 is connected to the first valve port 331 of the first reversing valve 33. The liquid refrigerant outlet 142 of the high-pressure gas-liquid separator 14 is connected via the first valve 15 to the second end of the first throttle valve 21, and via the heat recovery branch 23 to the second refrigerant inlet 241 of the low-pressure gas-liquid separator 24. The second valve port 332 of the first reversing valve 33 is connected to the fourth valve port 351 of the second reversing valve 35. The fifth valve port 352 of the second reversing valve 35 is connected to the first refrigerant port 121 of the outdoor heat exchanger 12. The sixth valve port 353 of the second reversing valve 35 is connected to the second refrigerant inlet 241 of the low-pressure gas-liquid separator 24, and the second gaseous refrigerant outlet 242 of the low-pressure gas-liquid separator 24 is connected to the inlet of the compressor 11. The seventh valve port 354 of the second reversing valve 35 is connected to the main interface of the gas pipe 38 via the eleventh valve 43. The main interface of the liquid pipe 39 is divided into two paths after passing through the tenth valve 42. One path is connected to the seventh refrigerant port 271 of the economizer 27, and the other path is connected to the ninth refrigerant port 273 of the economizer 27 via the third throttle valve 28. The second refrigerant port 122 of the outdoor heat exchanger 12 is connected via the sixth valve 32 to the eighth refrigerant port 272 of the economizer 27 and the first end of the first throttle valve 21. The other path of the second refrigerant port 122 of the outdoor heat exchanger 12 is connected to the eighth refrigerant port 272 of the economizer 27 via the second throttle valve 22. One of the tenth refrigerant port 274 of the economizer 27 is connected to the second refrigerant inlet 241 of the low-pressure gas-liquid separator 24 via the fourth valve 30, and the other of the tenth refrigerant port 274 of the economizer 27 is connected to the enthalpy-increasing port 111 of the compressor 11 via the fifth valve 31.

[0159] The first outlet 362 of the domestic water tank 36 is connected to the first water inlet 133 of the hot water heat exchanger 13 via the first water pump 37, and the first water outlet 134 of the hot water heat exchanger 13 is connected to the first return water inlet 363 of the domestic water tank 36.

[0160] The fifth refrigerant port 201 of the indoor unit 20 is connected to the corresponding branch port in the gas pipe 38, and the sixth refrigerant port 202 of the indoor unit 20 is connected to the corresponding branch port in the liquid pipe 39 via the fourth throttle valve 29.

[0161] The third refrigerant inlet 461 of the underfloor heating heat exchanger 46 is connected to the corresponding branch end in the gas pipe 38. The refrigerant outlet 462 of the underfloor heating heat exchanger 46 is connected to the corresponding branch end in the liquid pipe 39 via the fifth throttle valve 48 and the underfloor heating one-way valve 47, with the conduction direction of the underfloor heating one-way valve 47 facing the liquid pipe 39. The second water outlet 491 of the terminal 49 is connected to the second water inlet 463 of the underfloor heating heat exchanger 46 via the second water pump 50, and the second water outlet 464 of the underfloor heating heat exchanger 46 is connected to the second water return outlet 492 of the terminal 49.

[0162] In different modes, the heat pump system will correspond to different connections, 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:

[0163] like Figure 2 As shown, in defrost mode, the sixth valve 32, the first throttling valve 21, the second valve 18, the ninth valve 41, and the third valve 19 are open. The third valve port 333 of the first reversing valve 33 is connected to the second valve port 332, and the fourth valve port 351 of the second reversing valve 35 is connected to the fifth valve port 352. When defrosting of the outdoor heat exchanger is required in winter, the high-temperature gaseous refrigerant output from the compressor 11 enters the outdoor heat exchanger 12 through the first reversing valve 33 and the second reversing valve 35 to condense and release heat. Then, it enters the first throttling valve 21 through the sixth valve 32 for throttling and cooling. Next, it enters the hot water heat exchanger 13 to exchange heat with the domestic hot water in the domestic water tank 36. Finally, it returns to the inlet of the compressor 11 through the second pipeline 17 and the low-pressure gas-liquid separator 24, repeating the cycle.

[0164] like Figure 4As shown, in pure hot water mode, the seventh valve 34, the eighth valve 40, the ninth valve 41, the second valve 18, the first throttling valve 21, and the second throttling valve 22 are open, and the fifth valve port 352 of the second reversing valve 35 is connected to the sixth valve port 353. That is, when only domestic hot water needs to be produced, the high-temperature gaseous refrigerant output from the compressor 11 enters the hot water heat exchanger 13 through the seventh valve 34 and the eighth valve 40 to exchange heat with the water in the domestic water tank 36, then enters the first throttling valve 21 and the second throttling valve 22 through the ninth valve 41 and the first pipeline 16 for throttling and cooling, then enters the outdoor heat exchanger 12 for evaporation and heat absorption, and finally returns to the inlet of the compressor 11 through the second reversing valve 35 and the low-pressure gas-liquid separator 24, repeating the cycle.

[0165] like Figure 5 As shown, in pure hot water mode, the seventh valve 34, the eighth valve 40, the ninth valve 41, the first valve 15, the first throttle valve 21, and the second throttle valve 22 are open, and the fifth valve port 352 of the second reversing valve 35 is connected to the sixth valve port 353. That is, when only domestic hot water needs to be produced, the high-temperature gaseous refrigerant output from the compressor 11 enters the hot water heat exchanger 13 after passing through the seventh valve 34 and the eighth valve 40 to exchange heat with the water in the domestic water tank 36, then enters the high-pressure gas-liquid separator 14 through the ninth valve 41, and then enters the outdoor heat exchanger 12 for evaporation and heat absorption after being throttled and cooled by the first throttle valve 21 and the second throttle valve 22. Finally, it returns to the inlet of the compressor 11 after passing through the second reversing valve 35 and the low-pressure gas-liquid separator 24, and the cycle repeats.

[0166] like Figure 6As shown, in the cooling and total heat recovery domestic hot water mode, the seventh valve 34, the eighth valve 40, the ninth valve 41, the first valve 15, the first throttle valve 21, the third throttle valve 28, the tenth valve 42, the fourth throttle valve 29, the eleventh valve 43, and the fourth valve 30 are open, and the seventh valve port 354 of the second reversing valve 35 is connected to the sixth valve port 353. That is, when domestic hot water needs to be prepared quickly in cooling mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the hot water heat exchanger 13 after passing through the seventh valve 34 and the eighth valve 40 to exchange heat with the water in the domestic water tank 36. Then, it enters the high-pressure gas-liquid separator 14 through the ninth valve 41, and then enters the indoor unit 20 through the first throttle valve 21, the economizer 27 and the fourth throttle valve 29 to exchange heat with the indoor air. Finally, it returns to the inlet of the compressor 11 after passing through the eleventh valve 43, the second reversing valve 35 and the low-pressure gas-liquid separator 24, and the cycle repeats.

[0167] The hot water heat exchanger 13 is used to exchange heat with the water in the domestic water tank 36, so that all 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 outdoor heat exchanger 12 can be turned off, and the recovered heat is exchanged with the water in the domestic water tank 36 in the hot water heat exchanger 13, so as to quickly prepare domestic hot water, improve energy utilization, and increase the speed of hot water production.

[0168] Total heat recovery refers to the process where the high-temperature gaseous refrigerant discharged from the compressor 11 undergoes a phase change in the hot water heat exchanger 13, releasing the latent heat of the phase change, and all the heat of the refrigerant is recovered in the hot water heat exchanger 13.

[0169] like Figure 7As shown, when the domestic hot water reaches a certain temperature, it can be switched to a cooling plus waste heat recovery domestic hot water mode. In the cooling plus waste heat recovery domestic hot water mode, the seventh valve 34, the eighth valve 40, the ninth valve 41, the sixth valve 32, the third throttle valve 28, the tenth valve 42, the fourth throttle valve 29, the eleventh valve 43, and the fourth valve 30 are open. The first valve port 331 of the first reversing valve 33 is connected to the second valve port 332. The fourth valve port 351 of the second reversing valve 35 is connected to the fifth valve port 352. The seventh valve port 354 of the second reversing valve 35 is connected to the sixth valve port 353. That is, when domestic hot water needs to be prepared in cooling mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the hot water heat exchanger 13 through the seventh valve 34 and the eighth valve 40 to exchange heat with the water in the domestic water tank 36, then enters the high-pressure gas-liquid separator 14 through the ninth valve 41, then enters the outdoor heat exchanger 12 through the first reversing valve 33 and the second reversing valve 35 to condense and release heat, then enters the indoor unit 20 through the sixth valve 32, the economizer 27 and the fourth throttle valve 29 to exchange heat with the indoor air, and finally returns to the inlet of the compressor 11 through the eleventh valve 43, the second reversing valve 35 and the low-pressure gas-liquid separator 24, repeating the cycle.

[0170] The hot water heat exchanger 13 is used to exchange heat with the water in the domestic water tank 36, 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 36 in the hot water heat exchanger 13, so as to quickly prepare domestic hot water, improve energy utilization, and increase the speed of hot water production.

[0171] Waste heat recovery refers to the process where the high-temperature gaseous refrigerant discharged from the compressor 11 does not undergo a phase change in the hot water heat exchanger 13 and does not release latent heat of phase change, but instead releases sensible heat. Then, it condenses and releases latent heat in the outdoor heat exchanger 12, and then evaporates in the indoor unit 20 to absorb indoor heat to achieve a cooling effect.

[0172] Specifically, Figure 7 and Figure 6 The difference in the illustrated embodiment is that, Figure 7 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 6 In order to recover and utilize all the condensation heat originally used by the outdoor heat exchanger 12 for heat exchange with the air.

[0173] like Figure 8 As shown, in the cooling and waste heat recovery mode for producing domestic hot water, the seventh valve 34, the eighth valve 40, the ninth valve 41, the sixth valve 32, the third throttle valve 28, the tenth valve 42, the fourth throttle valve 29, the eleventh valve 43, and the fourth valve 30 are open. The second valve port 332 of the first reversing valve 33 is connected to the first valve port 331 and the third valve port 333. The fourth valve port 351 of the second reversing valve 35 is connected to the fifth valve port 352. The seventh valve port 354 of the second reversing valve 35 is connected to the sixth valve port 353. That is, when domestic hot water needs to be produced in cooling mode, the high-temperature gaseous refrigerant output from the compressor 11 enters the hot water heat exchanger 13 through the seventh valve 34 and the eighth valve 40, and the high-temperature gaseous refrigerant output from the compressor 11 enters the outdoor heat exchanger 12 through the first reversing valve 33 and the second reversing valve 35.

[0174] Specifically, Figure 8 and Figure 7 The difference in the illustrated embodiment is that, Figure 8 In the illustrated embodiment, an additional refrigerant path enters the outdoor heat exchanger 12 via the third valve port 333 and the second valve port 332 of the first reversing valve 33, and the fourth valve port 351 and the fifth valve port 352 of the second reversing valve 35. This allows for better control of the amount of refrigerant entering the hot water heat exchanger 13. Furthermore, the path where the refrigerant from the compressor 11 directly reaches the second reversing valve 35 ensures that it is a pure gaseous refrigerant. The pure gaseous refrigerant ensures that the second reversing valve 35 has sufficient pressure differential for reversing, thus reducing pressure loss in the refrigerant pipeline.

[0175] like Figure 9As shown, in the heating and domestic hot water mode, the seventh valve 34, the eighth valve 40, the ninth valve 41, the eleventh valve 43, the fourth throttle valve 29, the fifth throttle valve 48, the tenth valve 42, the third throttle valve 28, the second throttle valve 22, and the fifth valve 31 are open. The first valve port 331 of the first reversing valve 33 is connected to the second valve port 332. The fourth valve port 351 of the second reversing valve 35 is connected to the seventh valve port 354. The fifth valve port 352 of the second reversing valve 35 is connected to the sixth valve port 353. That is, when domestic hot water needs to be produced in heating mode, the high-temperature gaseous refrigerant output from the compressor 11 enters the hot water heat exchanger 13 through the seventh valve 34 and the eighth valve 40 to exchange heat with the water in the domestic water tank 36. Then, it enters the high-pressure gas-liquid separator 14 through the ninth valve 41, and then enters the indoor unit 20 through the first reversing valve 33, the second reversing valve 35, and the eleventh valve 43 to exchange heat with the indoor air. Next, it enters the second reversing valve 22 through the fourth throttling valve 29, the tenth valve 42, and the economizer 27 for throttling and cooling before entering the outdoor heat exchanger 12 for evaporation and heat absorption. Finally, it returns to the inlet of the compressor 11 through the second reversing valve 35 and the low-pressure gas-liquid separator 24, repeating the cycle. The heat pump system can produce domestic hot water and achieve underfloor heating effects while providing heating, thus improving energy efficiency.

[0176] like Figure 10 As shown, in the heating and domestic hot water mode, the seventh valve 34, the eighth valve 40, the ninth valve 41, the eleventh valve 43, the fourth throttle valve 29, the fifth throttle valve 48, the tenth valve 42, the third throttle valve 28, the second throttle valve 22, and the fifth valve 31 are open. The second valve port 332 of the first reversing valve 33 is connected to the first valve port 331 and the third valve port 333. The fourth valve port 351 of the second reversing valve 35 is connected to the seventh valve port 354. The fifth valve port 352 of the second reversing valve 35 is connected to the sixth valve port 353. That is, when domestic hot water needs to be prepared in heating mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the fourth refrigerant port 132 of the hot water heat exchanger 13 after passing through the seventh valve 34 and the eighth valve 40. The high-temperature gaseous refrigerant output from the outlet of the compressor 11 also enters the gas pipe 38 through the third valve port 333 and the second valve port 332 of the first reversing valve 33, the fourth valve port 351 and the seventh valve port 354 of the second reversing valve 35, and the eleventh valve 43.

[0177] Specifically, Figure 10 and Figure 9 The difference in the illustrated embodiment is that, Figure 10 In the illustrated embodiment, an additional path leads from the third valve port 333 and the second valve port 332 of the first reversing valve 33, the fourth valve port 351 and the seventh valve port 354 of the second reversing valve 35, and the tenth valve 42 into the gas pipe 38. This allows for better control of the amount of refrigerant entering the hot water heat exchanger 13. Furthermore, the path from the compressed refrigerant directly to the second reversing valve 35 ensures that the refrigerant is in a gaseous state. The pure gaseous refrigerant further ensures that the second reversing valve 35 has sufficient pressure differential for reversing, thus minimizing pressure loss in the refrigerant pipeline.

[0178] like Figure 11 As shown, in cooling mode, the sixth valve 32, the third throttle valve 28, the fourth valve 30, the eleventh valve 43, the fourth throttle valve 29, and the tenth valve 42 are open. The third valve port 333 of the first reversing valve 33 is connected to the second valve port 332. The fourth valve port 351 of the second reversing valve 35 is connected to the fifth valve port 352. The seventh valve port 354 of the second reversing valve 35 is connected to the sixth valve port 353.

[0179] like Figure 12 As shown, in heating mode, the eleventh valve 43, the fourth throttle valve 29, the fifth throttle valve 48, the tenth valve 42, the third throttle valve 28, the fifth valve 31, and the second throttle valve 22 are open. The second valve port 332 of the first reversing valve 33 is connected to the third valve port 333. The fourth valve port 351 of the second reversing valve 35 is connected to the seventh valve port 354. The fifth valve port 352 of the second reversing valve 35 is connected to the sixth valve port 353.

[0180] 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.

[0181] It is understood that the above embodiments only illustrate some implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application's patent. It should be noted that those skilled in the art can freely combine the above embodiments or technical features without departing from the concept of this application, and can also make several modifications and improvements, all of which fall within the protection scope of this application. That is, the embodiments described "in some embodiments" can be freely combined with any of the preceding and following embodiments. Therefore, all equivalent transformations and modifications made within the scope of the claims of this application should be covered by the claims of this application.

Claims

1. A heat pump system, characterized in that, include: The compressor is used to compress refrigerant; An outdoor heat exchanger, the outdoor heat exchanger including a first refrigerant port and a second refrigerant port, the first refrigerant port being connected to the second refrigerant port; A hot water heat exchanger, the hot water heat exchanger including a third refrigerant port and a fourth refrigerant port, the third refrigerant port being connected to the fourth refrigerant port; A high-pressure gas-liquid separator, comprising a first refrigerant inlet and a liquid refrigerant outlet, wherein the liquid refrigerant outlet is connected to the first refrigerant inlet; A throttling device for throttling refrigerant; First valve, first pipeline, and second pipeline; The compressor outlet is connected to the first refrigerant port of the outdoor heat exchanger; the second refrigerant port of the outdoor heat exchanger is connected to the first end of the throttling device; the second end of the throttling device is connected via the first pipeline to the third refrigerant port of the hot water heat exchanger, and the other end of the second end of the throttling device is connected via the first valve, the liquid refrigerant outlet of the high-pressure gas-liquid separator, and the first refrigerant inlet to the third refrigerant port of the hot water heat exchanger; the fourth refrigerant port of the hot water heat exchanger is connected to the compressor inlet via the second pipeline.

2. The heat pump system according to claim 1, characterized in that, The heat pump system also includes: A second valve and a third valve, wherein the second valve is located on the first pipeline and the third valve is located on the second pipeline.

3. The heat pump system according to claim 2, characterized in that, The first valve is a one-way valve, and the conduction direction of the one-way valve is towards the second end of the throttling device; and / or, the second valve and the third valve are on / off valves.

4. The heat pump system according to any one of claims 1 to 3, characterized in that, The fourth refrigerant port of the hot water heat exchanger is also connected to the outlet of the compressor, and the first refrigerant port of the outdoor heat exchanger is also connected to the inlet of the compressor.

5. The heat pump system according to any one of claims 1 to 3, characterized in that, The heat pump system also includes: The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected; The fourth refrigerant port of the hot water heat exchanger is also connected to the outlet of the compressor, the sixth refrigerant port of the indoor unit is connected to the first end of the throttling device, and the fifth refrigerant port of the indoor unit is connected to the inlet of the compressor.

6. The heat pump system according to any one of claims 1 to 3, characterized in that, The high-pressure gas-liquid separator also includes a first gaseous refrigerant outlet, which is connected to the first refrigerant inlet; The heat pump system also includes: The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected; The fourth refrigerant port of the hot water heat exchanger is also connected to the outlet of the compressor; the third refrigerant port of the hot water heat exchanger is also connected to the first refrigerant port of the outdoor heat exchanger via the first refrigerant inlet and the first gaseous refrigerant outlet of the high-pressure gas-liquid separator; the second refrigerant port of the outdoor heat exchanger is also connected to the sixth refrigerant port of the indoor unit via the throttling device; and the fifth refrigerant port of the indoor unit is connected to the inlet of the compressor.

7. The heat pump system according to any one of claims 1 to 3, characterized in that, The high-pressure gas-liquid separator also includes a first gaseous refrigerant outlet, which is connected to the first refrigerant inlet; The heat pump system also includes: The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected; The fourth refrigerant port of the hot water heat exchanger is also connected to the outlet of the compressor; the third refrigerant port of the hot water heat exchanger is also connected to the fifth refrigerant port of the indoor unit via the first refrigerant inlet and the first gaseous refrigerant outlet of the high-pressure gas-liquid separator; the second refrigerant port of the outdoor heat exchanger is also connected to the sixth refrigerant port of the indoor unit via the throttling device; and the first refrigerant port of the outdoor heat exchanger is also connected to the inlet of the compressor.

8. The heat pump system according to any one of claims 1 to 3, characterized in that, The heat pump system also includes: The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected; The second refrigerant port of the outdoor heat exchanger is connected to the sixth refrigerant port of the indoor unit via the throttling device, and the fifth refrigerant port of the indoor unit is connected to the inlet of the compressor.

9. The heat pump system according to any one of claims 1 to 3, characterized in that, The heat pump system also includes: The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected; The fifth refrigerant port of the indoor unit is connected to the outlet of the compressor, the second refrigerant port of the outdoor heat exchanger is also connected to the sixth refrigerant port of the indoor unit via the throttling device, and the first refrigerant port of the outdoor heat exchanger is also connected to the inlet of the compressor.

10. The heat pump system according to any one of claims 1 to 3, characterized in that, The throttling device includes a first throttling valve and a second throttling valve; the high-pressure gas-liquid separator also includes a first gaseous refrigerant outlet, which is connected to the first refrigerant inlet; The heat pump system also includes: The indoor unit includes a fifth refrigerant port and a sixth refrigerant port, the fifth refrigerant port and the sixth refrigerant port being connected; The compressor outlet is connected to the first refrigerant port of the outdoor heat exchanger, the fifth refrigerant port of the indoor unit, and the fourth refrigerant port of the hot water heat exchanger. One path of the second refrigerant port of the outdoor heat exchanger is connected to the first end of the first throttling valve, and another path of the second refrigerant port of the outdoor heat exchanger is connected to the sixth refrigerant port of the indoor unit via the second throttling valve. The sixth refrigerant port of the indoor unit is also connected to the first end of the first throttling valve. One path of the second end of the first throttling valve is connected to the third refrigerant port of the hot water heat exchanger via the first pipeline. The first throttle valve is connected to the second end of the first valve, and the second end of the first throttle valve is connected to the third refrigerant port of the hot water heat exchanger via the first valve, the liquid refrigerant outlet of the high-pressure gas-liquid separator, and the first refrigerant inlet. The first gaseous refrigerant outlet of the high-pressure gas-liquid separator is connected to the first refrigerant port of the outdoor heat exchanger and the fifth refrigerant port of the indoor unit. The fourth refrigerant port of the hot water heat exchanger is connected to the inlet of the compressor via the second pipeline. The first refrigerant port of the outdoor heat exchanger and the fifth refrigerant port of the indoor unit are also connected to the inlet of the compressor.

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