Heat pump system

Abstract

The utility model discloses a heat pump system which comprises a compressor, a heat recovery heat exchanger, a first reversing valve, a high-pressure gas-liquid separator, an outdoor side heat exchanger, an air conditioner side heat exchanger and a first throttling device. An outlet of the compressor is connected with a first refrigerant inlet of the heat recovery heat exchanger through a first reversing valve and connected with a first refrigerant port of the outdoor side heat exchanger and a third refrigerant port of the air conditioner side heat exchanger. A first refrigerant outlet of the heat recovery heat exchanger is connected with a second refrigerant inlet of the high-pressure gas-liquid separator; a second refrigerant outlet of the high-pressure gas-liquid separator outputs a gaseous refrigerant and is connected with the first refrigerant port and the third refrigerant port; a third refrigerant outlet of the high-pressure gas-liquid separator outputs liquid refrigerant and is connected with a second refrigerant port of the outdoor side heat exchanger and a fourth refrigerant port of the air conditioner side heat exchanger through the first throttling device, the second refrigerant port is connected with the fourth refrigerant port, and the third refrigerant port and the first refrigerant port are connected with an inlet of the compressor. The stability of the system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat pump technology field especially relates to a heat pump system. BACKGROUND

[0002] The heat pump system of relevant technology generally has multiple operation modes, and the refrigerant flow direction control when mode switching is carried out by utilizing a three-way valve, which can easily lead to system instability, for example, the refrigerant flowing through the original pipeline can cause high pressure alarm of the low pressure side of the compressor. UTILITY MODEL CONTENTS

[0003] The technical problem to be solved by the utility model is that, in view of at least one defect of the relevant technology mentioned in the above background technology, the refrigerant flow direction control when mode switching is carried out by utilizing a three-way valve of the heat pump system can easily lead to system instability, and a heat pump system is provided.

[0004] The utility model adopts the technical scheme that a heat pump system is constructed, which comprises:

[0005] A compressor is used for compressing refrigerant.

[0006] A heat recovery heat exchanger comprises a first refrigerant inlet and a first refrigerant outlet in communication with the first refrigerant inlet.

[0007] A first reversing valve is used for regulating and controlling the amount of refrigerant entering the heat recovery heat exchanger.

[0008] A high-pressure gas-liquid separator comprises a second refrigerant inlet, a second refrigerant outlet in communication with the second refrigerant inlet, and a third refrigerant outlet in communication with the second refrigerant inlet; the second refrigerant outlet is used for outputting gaseous refrigerant after gas-liquid separation, and the third refrigerant outlet is used for outputting liquid refrigerant after gas-liquid separation.

[0009] An outdoor heat exchanger comprises a first refrigerant port and a second refrigerant port in communication with the first refrigerant port.

[0010] An air conditioner side heat exchanger comprises a third refrigerant port and a fourth refrigerant port in communication with the third refrigerant port; and

[0011] A first throttling device.

[0012] The outlet of the compressor is connected with the first refrigerant inlet through the first reversing valve, and the outlet of the compressor is connected with the first refrigerant port and the third refrigerant port through the first reversing valve.

[0013] The first refrigerant outlet is connected with the second refrigerant inlet.

[0014] The second refrigerant outlet is connected to the first refrigerant port and the third refrigerant port;

[0015] The third refrigerant outlet is connected to the second refrigerant port and the fourth refrigerant port through the first throttling device, the second refrigerant port is connected to the fourth refrigerant port, and the third refrigerant port and the first refrigerant port are connected to the inlet of the compressor.

[0016] In one of the embodiments, the heat pump system further comprises:

[0017] A switch valve, the second refrigerant outlet is connected to the first refrigerant port and the third refrigerant port through the switch valve.

[0018] In one of the embodiments, the pipeline between the first throttling device and the fourth refrigerant port is at least partially a capillary tube.

[0019] In one of the embodiments, the heat pump system further comprises:

[0020] A liquid storage container, the liquid inlet of the liquid storage container is connected to the fourth refrigerant port, the liquid outlet of the liquid storage container is connected to the second refrigerant port, and the third refrigerant outlet is connected between the fourth refrigerant port and the liquid inlet of the liquid storage container through the first throttling device.

[0021] In one of the embodiments, the outlet of the compressor is connected to the first refrigerant inlet through the first reversing valve, when the third refrigerant outlet is connected to the fourth refrigerant port through the first throttling device, the refrigerant forms a refrigeration refrigerant circuit through the first reversing valve, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, the third refrigerant outlet, the first throttling device, the fourth refrigerant port and the third refrigerant port after coming out of the compressor, and all the heat of the refrigerant is exchanged in the heat recovery heat exchanger.

[0022] The outlet of the compressor is connected to the first refrigerant inlet through the first reversing valve, the second refrigerant outlet is connected to the first refrigerant port, and the third refrigerant outlet is connected to the fourth refrigerant port through the first throttling device; when the third refrigerant outlet is connected to the second refrigerant port through the first throttling device, the refrigerant from the compressor enters the second refrigerant inlet through the first reversing valve, the first refrigerant inlet and the first refrigerant outlet, and after gas-liquid separation, the gaseous refrigerant enters the fourth refrigerant port through the second refrigerant outlet, the first refrigerant port and the second refrigerant port, and the liquid refrigerant enters the fourth refrigerant port through the third refrigerant outlet and the first throttling device, forming a refrigeration refrigerant circuit, and at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger.

[0023] In one embodiment, the outlet of the compressor is connected to the first refrigerant inlet through the first reversing valve, the second refrigerant outlet is connected to the third refrigerant port, and the third refrigerant outlet is connected to the second refrigerant port through the first throttling device; when the third refrigerant outlet is connected to the second refrigerant port through the first throttling device, the refrigerant from the compressor enters the second refrigerant inlet through the first reversing valve, the first refrigerant inlet and the first refrigerant outlet, and after gas-liquid separation, the gaseous refrigerant enters the second refrigerant port through the second refrigerant outlet, the third refrigerant port and the fourth refrigerant port, and the liquid refrigerant enters the second refrigerant port through the third refrigerant outlet and the first throttling device, forming a heating refrigerant circuit, and at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger.

[0024] The outlet of the compressor is connected to the first refrigerant inlet through the first reversing valve, and the third refrigerant outlet is connected to the second refrigerant port through the first throttling device; when the third refrigerant outlet is connected to the second refrigerant port through the first throttling device, the refrigerant from the compressor enters the second refrigerant inlet through the first reversing valve, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, the third refrigerant outlet, the first throttling device, the second refrigerant port and the first refrigerant port, forming a pure hot water refrigerant circuit, and all the heat of the refrigerant is exchanged in the heat recovery heat exchanger.

[0025] In one embodiment, the first reversing valve includes a first valve port, a second valve port and a third valve port;

[0026] The first valve port is connected to the outlet of the compressor, the second valve port is connected to the first refrigerant inlet, and the third valve port is connected to the first refrigerant port and the third refrigerant port;

[0027] When the first valve port is connected to the second valve port, the outlet of the compressor is connected to the first refrigerant inlet;

[0028] When the first valve port is communicated with the third valve port, the outlet of the compressor is communicated with the first refrigerant port or the third refrigerant port.

[0029] In one of the embodiments, the heat pump system further comprises:

[0030] A second reversing valve, comprising a fourth valve port, a fifth valve port, a sixth valve port and a seventh valve port;

[0031] The fourth valve port is connected with the first reversing valve and the second refrigerant outlet, the fifth valve port is connected with the first refrigerant port, the sixth valve port is connected with the third refrigerant port, and the seventh valve port is connected with the inlet of the compressor;

[0032] When the fourth valve port is communicated with the fifth valve port, the first refrigerant port is communicated with the outlet of the compressor and / or the second refrigerant outlet;

[0033] When the fourth valve port is communicated with the sixth valve port, the third refrigerant port is communicated with the outlet of the compressor and / or the second refrigerant outlet;

[0034] When the fifth valve port is communicated with the seventh valve port, the first refrigerant port is communicated with the inlet of the compressor;

[0035] When the sixth valve port is communicated with the seventh valve port, the third refrigerant port is communicated with the inlet of the compressor.

[0036] In one of the embodiments, the heat pump system further comprises:

[0037] An economizer, the first end of which is connected with the second refrigerant port, the fourth refrigerant port and the third refrigerant outlet, and the second end of which is connected with the fourth refrigerant port and the second refrigerant port.

[0038] In one of the embodiments, the heat recovery heat exchanger further comprises a first water inlet and a first water outlet communicated with the first water inlet;

[0039] The heat pump system further comprises:

[0040] A domestic water tank, which is connected with the first water inlet and the first water outlet respectively.

[0041] By implementing the present application, the following beneficial effects are achieved:

[0042] The utility model discloses a high pressure gas liquid separator is arranged to the refrigerant export end of the heat recovery heat exchanger, utilizes gas liquid separation, can realize refrigeration and full heat recovery mode and refrigeration and waste heat recovery mode switching when and the automatic flow of refrigerant when heating and hot water mode and pure hot water mode switching, thereby improves the stability of system. BRIEF DESCRIPTION OF DRAWINGS

[0043] The utility model will be further described below combining with the drawings and example, on the drawings:

[0044] Figure 1 It is the schematic diagram of heat pump system of the utility model;

[0045] Figure 2 It is the refrigerant flow direction schematic diagram of heat pump system of the utility model in the preparation hot water of full heat recovery mode when refrigerating;

[0046] Figure 3 It is the first refrigerant flow direction schematic diagram of heat pump system of the utility model in the preparation hot water of waste heat recovery mode when refrigerating;

[0047] Figure 4 It is the second refrigerant flow direction schematic diagram of heat pump system of the utility model in the preparation hot water of waste heat recovery mode when refrigerating;

[0048] Figure 5 It is the first refrigerant flow direction schematic diagram of heat pump system of the utility model in the preparation hot water when heating;

[0049] Figure 6 It is the second refrigerant flow direction schematic diagram of heat pump system of the utility model in the preparation hot water when heating;

[0050] Figure 7 It is the refrigerant flow direction schematic diagram of heat pump system of the utility model in the preparation hot water;

[0051] Figure 8 It is the first refrigerant flow direction schematic diagram of heat pump system of the utility model in the refrigeration mode alone;

[0052] Figure 9 It is the second refrigerant flow direction schematic diagram of heat pump system of the utility model in the refrigeration mode alone;

[0053] Figure 10 It is the first refrigerant flow direction schematic diagram of heat pump system of the utility model in the heating mode alone;

[0054] Figure 11 It is the second refrigerant flow direction schematic diagram of heat pump system of the utility model in the heating mode alone. DETAILED DESCRIPTION

[0055] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings.

[0056] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0057] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0058] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "provided", "located" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be mechanically connected, or it can be chemically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] It should be noted that the connection between the following ports, between the ports and the components, or between the components is only a physical structural connection, and does not uniquely limit the communication relationship and the refrigerant flow relationship.

[0060] As Figure 1 Some embodiments of the present application disclose a heat pump system, which comprises a compressor 11, a heat recovery heat exchanger 12, a first reversing valve 13, a high-pressure gas-liquid separator 14, an outdoor heat exchanger 15, an air conditioning side heat exchanger 16 and a first throttling device 17, and the specific embodiments are as follows:

[0061] The compressor 11 is configured to compress refrigerant. The heat recovery heat exchanger 12 comprises a first refrigerant inlet 121 and a first refrigerant outlet 122 connected to the first refrigerant inlet 121. The first reversing valve 13 is configured to regulate the amount of refrigerant entering the heat recovery heat exchanger 12. The high-pressure gas-liquid separator 14 comprises a second refrigerant inlet 141, a second refrigerant outlet 142 connected to the second refrigerant inlet 141, and a third refrigerant outlet 143 connected to the second refrigerant inlet 141. The second refrigerant outlet 142 is configured to output gaseous refrigerant after gas-liquid separation, and the third refrigerant outlet 143 is configured to output liquid refrigerant after gas-liquid separation. The outdoor heat exchanger 15 comprises a first refrigerant port 151 and a second refrigerant port 152 connected to the first refrigerant port 151, and is configured to exchange heat between refrigerant and ambient air. The air conditioning heat exchanger 16 comprises a third refrigerant port 161 and a fourth refrigerant port 162 connected to the third refrigerant port 161, and is configured to exchange heat between refrigerant and water in the terminal device 31.

[0062] The outlet of the compressor 11 is connected to the first refrigerant inlet 121 through the first reversing valve 13, and the outlet of the compressor 11 is connected to the first refrigerant port 151 and the third refrigerant port 161 through the first reversing valve 13. The first refrigerant outlet 122 is connected to the second refrigerant inlet 141, and the second refrigerant outlet 142 is connected to the first refrigerant port 151 and the third refrigerant port 161. The third refrigerant outlet 143 is connected to the second refrigerant port 152 and the fourth refrigerant port 162 through the first throttling device 17, the second refrigerant port 152 is connected to the fourth refrigerant port 162, and the third refrigerant port 161 and the first refrigerant port 151 are connected to the inlet of the compressor 11.

[0063] For example, the heat recovery heat exchanger 12 is a double-pipe heat exchanger, the outdoor heat exchanger 15 is a finned heat exchanger, the air conditioning heat exchanger 16 is a plate heat exchanger, and the first throttling device 17 is an electronic expansion valve or a thermal expansion valve. The double-pipe heat exchanger, the finned heat exchanger, the plate heat exchanger, the electronic expansion valve, and the thermal expansion valve are only examples and do not limit the present application. Other devices can also be used.

[0064] In this embodiment, the high-pressure gas-liquid separator 14 is arranged at the refrigerant outlet end of the heat recovery heat exchanger 12. By using gas-liquid separation, the system can automatically switch the flow direction of refrigerant when switching between the refrigeration and full heat recovery hot water production modes, and between the refrigeration and waste heat recovery hot water production modes, and between the heating and hot water production modes and the pure hot water mode, thereby improving the stability of the system.

[0065] As shown in Figure 2 the outlet of the compressor 11 is communicated with the first refrigerant inlet 121 through the first reversing valve 13, the third refrigerant outlet 143 is communicated with the fourth refrigerant port 162 through the first throttling device 17, and when the third refrigerant port 161 is communicated with the inlet of the compressor 11, the refrigerant from the compressor 11 forms a refrigeration refrigerant circuit through the first reversing valve 13, the first refrigerant inlet 121, the first refrigerant outlet 122, the second refrigerant inlet 141, the third refrigerant outlet 143, the first throttling device 17, the fourth refrigerant port 162 and the third refrigerant port 161, and at the same time, all the heat of the refrigerant is exchanged in the heat recovery heat exchanger 12, that is, the refrigeration and full heat recovery mode for producing hot water.

[0066] As shown in Figure 3 the outlet of the compressor 11 is communicated with the first refrigerant inlet 121 through the first reversing valve 13, the second refrigerant outlet 142 is communicated with the first refrigerant port 151, the second refrigerant port 152 is communicated with the fourth refrigerant port 162, the third refrigerant outlet 143 is communicated with the fourth refrigerant port 162 through the first throttling device 17, and when the third refrigerant port 161 is communicated with the inlet of the compressor 11, the refrigerant from the compressor 11 enters the second refrigerant inlet 141 through the first reversing valve 13, the first refrigerant inlet 121 and the first refrigerant outlet 122, after gas-liquid separation, the gaseous refrigerant enters the fourth refrigerant port 162 through the second refrigerant outlet 142, the first refrigerant port 151 and the second refrigerant port 152, and the liquid refrigerant enters the fourth refrigerant port 162 through the third refrigerant outlet 143 and the first throttling device 17, forming a refrigeration refrigerant circuit, and at the same time, at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger 12, that is, the refrigeration and waste heat recovery (also called partial heat recovery) mode for producing hot water.

[0067] As shown in Figure 4As shown, the outlet of the compressor 11 is connected to the first refrigerant inlet 121 and the first refrigerant port 151 via the first reversing valve 13. The second refrigerant outlet 142 is connected to the first refrigerant port 151, and the second refrigerant port 152 is connected to the fourth refrigerant port 162. The third refrigerant outlet 143 is connected to the fourth refrigerant port 162 via the first throttling device 17. When the third refrigerant port 161 is connected to the inlet of the compressor 11, the refrigerant exits the compressor 11 and flows through the first reversing valve 13, the first refrigerant port 151, and the second refrigerant port 152 into the fourth refrigerant port. One path leads to the second refrigerant inlet 141 via the first reversing valve 13, the first refrigerant inlet 121, and the first refrigerant outlet 122. After gas-liquid separation, the gaseous refrigerant enters the fourth refrigerant port 162 via the second refrigerant outlet 142, the first refrigerant port 151, and the second refrigerant port 152, while the liquid refrigerant enters the fourth refrigerant port 162 via the third refrigerant outlet 143 and the first throttling device 17, forming a refrigerant circuit for refrigeration. At the same time, at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger 12, i.e., a domestic hot water production mode of refrigeration and waste heat recovery (also called partial heat recovery).

[0068] like Figure 5 As shown, the outlet of the compressor 11 is connected to the first refrigerant inlet 121 via the first reversing valve 13, the second refrigerant outlet 142 is connected to the third refrigerant port 161, the fourth refrigerant port 162 is connected to the second refrigerant port 152, and the third refrigerant outlet 143 is connected to the second refrigerant port 152 via the first throttling device 17. When the first refrigerant port 151 is connected to the inlet of the compressor 11, the refrigerant exits the compressor 11 and passes through the first reversing valve 13 and the first refrigerant inlet 121. The refrigerant enters the second refrigerant inlet 141 through inlet 121 and the first refrigerant outlet 122. After gas-liquid separation, the gaseous refrigerant enters the second refrigerant port 152 through the second refrigerant outlet 142, the third refrigerant port 161, and the fourth refrigerant port 162, while the liquid refrigerant enters the second refrigerant port 152 through the third refrigerant outlet 143 and the first throttling device 17, forming a heating refrigerant circuit. At the same time, at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger 12, i.e., heating plus domestic hot water mode.

[0069] like Figure 6As shown, the outlet of the compressor 11 is communicated with the first refrigerant inlet 121 and the third refrigerant port 161 through the first reversing valve 13, the second refrigerant outlet 142 is communicated with the third refrigerant port 161, the fourth refrigerant port 162 is communicated with the second refrigerant port 152, the third refrigerant outlet 143 is communicated with the second refrigerant port 152 through the first throttling device 17, when the first refrigerant port 151 is communicated with the inlet of the compressor 11, the refrigerant from the compressor 11 enters the second refrigerant port 152 through the first reversing valve 13, the third refrigerant port 161 and the fourth refrigerant port 162, and enters the second refrigerant inlet 141 through the first reversing valve 13, the first refrigerant inlet 121 and the first refrigerant outlet 122, after gas-liquid separation, the gaseous refrigerant enters the second refrigerant port 152 through the second refrigerant outlet 142, the third refrigerant port 161 and the fourth refrigerant port 162, the liquid refrigerant enters the second refrigerant port 152 through the third refrigerant outlet 143 and the first throttling device 17, forming a refrigerant circuit for heating, and at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger 12, i.e. the mode of heating and hot water for daily use.

[0070] As shown, Figure 7 the outlet of the compressor 11 is communicated with the first refrigerant inlet 121 through the first reversing valve 13, the third refrigerant outlet 143 is communicated with the second refrigerant port 152 through the first throttling device 17, when the first refrigerant port 151 is communicated with the inlet of the compressor 11, the refrigerant from the compressor 11 enters the second refrigerant port 152 through the first reversing valve 13, the first refrigerant inlet 121, the first refrigerant outlet 122, the second refrigerant inlet 141, the third refrigerant outlet 143, the first throttling device 17, the second refrigerant port 152 and the first refrigerant port 151, forming a refrigerant circuit for pure hot water, and all the heat of the refrigerant is exchanged in the heat recovery heat exchanger 12, i.e. the mode of pure hot water.

[0071] It should be noted that all the heat exchanged in the heat recovery heat exchanger 12 means that all the refrigerant becomes liquid refrigerant after being exchanged in the heat recovery heat exchanger 12, and part of the heat exchanged in the heat recovery heat exchanger 12 means that part of the refrigerant becomes gaseous refrigerant after being exchanged in the heat recovery heat exchanger 12.

[0072] As shown, Figure 8As shown, the outlet of the compressor 11 is connected to the first refrigerant port 151 through the first reversing valve 13, the second refrigerant port 152 is connected to the fourth refrigerant port 162, and the third refrigerant port 161 is connected to the inlet of the compressor 11, when the refrigerant from the compressor 11 forms a refrigerant circuit for separate refrigeration through the first reversing valve 13, the first refrigerant port 151, the second refrigerant port 152, the fourth refrigerant port 162, and the third refrigerant port 161, that is, a separate refrigeration mode.

[0073] As shown, Figure 9 the outlet of the compressor 11 is connected to the first refrigerant port 151 through the first reversing valve 13, the second refrigerant port 152 is connected to the fourth refrigerant port 162, and the third refrigerant port 161 is connected to the inlet of the compressor 11, when the refrigerant from the compressor 11 forms a refrigerant circuit for separate refrigeration through the first reversing valve 13, the first refrigerant port 151, the second refrigerant port 152, the fourth refrigerant port 162, and the third refrigerant port 161, that is, a separate refrigeration mode. At this time, the refrigerant pipeline of the heat recovery heat exchanger 12 does not exchange heat, but only serves as a passage.

[0074] As shown, Figure 10 the outlet of the compressor 11 is connected to the first refrigerant port 151 through the first reversing valve 13, the second refrigerant port 152 is connected to the fourth refrigerant port 162, and the third refrigerant port 161 is connected to the inlet of the compressor 11, when the refrigerant from the compressor 11 forms a refrigerant circuit for separate refrigeration through the first reversing valve 13, the first refrigerant port 151, the second refrigerant port 152, the fourth refrigerant port 162, and the third refrigerant port 161, that is, a separate refrigeration mode. At this time, the refrigerant pipeline of the heat recovery heat exchanger 12 does not exchange heat, but only serves as a passage.

[0075] As shown, Figure 11As shown, the outlet of the compressor 11 is connected to the first refrigerant inlet 121 through the first reversing valve 13, the first refrigerant outlet 122 is connected to the second refrigerant inlet 141, the second refrigerant outlet 142 is connected to the third refrigerant port 161, the fourth refrigerant port 162 is connected to the second refrigerant port 152, and the first refrigerant port 151 is connected to the inlet of the compressor 11. When the refrigerant comes out of the compressor 11, it forms a refrigerant circuit for separate heating through the first reversing valve 13, the first refrigerant inlet 121, the first refrigerant outlet 122, the second refrigerant inlet 141, the second refrigerant outlet 142, the third refrigerant port 161, the fourth refrigerant port 162, the second refrigerant port 152, and the first refrigerant port 151, that is, a separate heating mode. At this time, the refrigerant pipeline of the heat recovery heat exchanger 12 does not exchange heat and only serves as a passage.

[0076] In some embodiments, as shown in FIG. 1, the first refrigerant inlet 121 and the first refrigerant outlet 122 are located on the upper part of the first refrigerant port 151. Figure 1 As shown, the second refrigerant inlet 141 and the second refrigerant outlet 142 are located on the upper part of the third refrigerant outlet 143.

[0077] In some embodiments, as shown in FIG. 1, the first refrigerant inlet 121 and the first refrigerant outlet 122 are located on the upper part of the first refrigerant port 151. Figure 1 As shown, the second refrigerant inlet 141 and the second refrigerant outlet 142 are located on the upper part of the third refrigerant outlet 143.

[0078] By opening or closing the switch valve 18, the total heat or at least part of the heat of the refrigerant can be switched in the heat recovery heat exchanger 12 for heat exchange, that is, the switching between the refrigeration and full heat recovery mode for domestic hot water and the refrigeration and waste heat recovery mode for domestic hot water can be realized, and the switching between the heating and domestic hot water mode and the pure hot water mode can be realized. In combination with the automatic refrigerant flow direction of the high-pressure gas-liquid separator 14 during switching, the stability of the system can be improved.

[0079] In some embodiments, as shown in FIG. 1, the first refrigerant inlet 121 and the first refrigerant outlet 122 are located on the upper part of the first refrigerant port 151. Figure 1 As shown, in order to further adjust the flow rate, the pipeline between the first throttling device 17 and the fourth refrigerant port 162 is at least partially a capillary tube 19. It can be understood that at least partially can be partially or entirely.

[0080] In some embodiments, as shown in FIG. 1, the first refrigerant inlet 121 and the first refrigerant outlet 122 are located on the upper part of the first refrigerant port 151. Figure 1As shown, the heat pump system further includes a liquid storage container 20, the liquid inlet 201 of which is connected to the fourth refrigerant port 162, the liquid outlet 202 of which is connected to the second refrigerant port 152, and the third refrigerant outlet 143 which is connected between the fourth refrigerant port 162 and the liquid inlet 201 of the liquid storage container 20 via the first throttling device 17.

[0081] like Figure 5 As shown, in the heating and domestic hot water mode, the refrigerant exits from the compressor 11 and enters the second refrigerant inlet 141 via the first reversing valve 13, the first refrigerant inlet 121, and the first refrigerant outlet 122. After gas-liquid separation, the gaseous refrigerant enters the second refrigerant port 152 via the second refrigerant outlet 142, the third refrigerant port 161, the fourth refrigerant port 162, the liquid inlet 201 of the liquid storage container 20, and the liquid outlet 202 of the liquid storage container 20. The liquid refrigerant enters the second refrigerant port 152 via the third refrigerant outlet 143, the first throttling device 17, the liquid inlet 201 of the liquid storage container 20, and the liquid outlet 202 of the liquid storage container 20, forming a heating refrigerant circuit. At the same time, at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger 12.

[0082] like Figure 7 As shown, in pure hot water mode, the refrigerant exiting the compressor 11 passes through the first reversing valve 13, the first refrigerant inlet 121, the first refrigerant outlet 122, the second refrigerant inlet 141, the third refrigerant outlet 143, the first throttling device 17, the liquid inlet 201 of the liquid storage container 20, the liquid outlet 202 of the liquid storage container 20, the second refrigerant port 152, and the first refrigerant port 151 to form a pure hot water refrigerant circuit. At the same time, all the heat of the refrigerant is exchanged in the heat recovery heat exchanger 12.

[0083] In some embodiments, such as Figure 1 As shown, the first reversing valve 13 includes a first valve port 131, a second valve port 132, and a third valve port 133. The first valve port 131 is connected to the outlet of the compressor 11, the second valve port 132 is connected to the first refrigerant inlet 121, and the third valve port 133 is connected to the first refrigerant port 151 and the third refrigerant port 161. For example, the first reversing valve 13 is a three-way valve. The three-way valve mentioned here is only an example and is not intended to limit this application; other valves are also possible.

[0084] When the first valve port 131 is communicated with the second valve port 132, the outlet of the compressor 11 is communicated with the first refrigerant inlet 121. When the first valve port 131 is communicated with the third valve port 133, the outlet of the compressor 11 is communicated with the first refrigerant port 151 or the third refrigerant port 161.

[0085] As shown in some embodiments, Figure 1 As shown in some embodiments,

[0086] When the fourth valve port 211 is communicated with the fifth valve port 212, the first refrigerant port 151 is communicated with the outlet of the compressor 11 and / or the second refrigerant outlet 142.

[0087] When the fourth valve port 211 is communicated with the sixth valve port 213, the third refrigerant port 161 is communicated with the outlet of the compressor 11 and / or the second refrigerant outlet 142.

[0088] When the fifth valve port 212 is communicated with the seventh valve port 214, the first refrigerant port 151 is communicated with the inlet of the compressor 11.

[0089] When the sixth valve port 213 is communicated with the seventh valve port 214, the third refrigerant port 161 is communicated with the inlet of the compressor 11.

[0090] As shown in some embodiments, Figure 1 As shown in some embodiments,

[0091] The economizer includes a main refrigerant path and an enthalpy-increasing auxiliary path, and the first end and the second end of the economizer are the first end and the second end of the main refrigerant path.

[0092] Specifically, the economizer includes a heat exchanger 22, a second throttling device 23, and a third throttling device 24. The heat exchanger 22 includes a main refrigerant inlet 221, an auxiliary refrigerant inlet 222, a main refrigerant outlet 223, and an auxiliary refrigerant outlet 224. For example, the second throttling device 23 and the third throttling device 24 are electronic expansion valves or thermal expansion valves. Here, the electronic expansion valves and the thermal expansion valves are only examples and do not limit the present application. Other devices can also be used.

[0093] The first end of the economizer is divided into two paths. One path is connected to the second refrigerant port 152 and the fourth refrigerant port 162 after passing through the main refrigerant path, i.e., passing through the main refrigerant inlet 221, the main refrigerant outlet 223, and the third throttling device 24 in sequence. The other path is connected to the enthalpy-increasing port 111 of the compressor 11 after passing through the enthalpy-increasing auxiliary path, i.e., passing through the second throttling device 23, the auxiliary refrigerant inlet 222, and the auxiliary refrigerant outlet 224 in sequence.

[0094] In this embodiment, the refrigerant from the second refrigerant port 152 or the liquid storage container 20 passes through the main refrigerant path and the enthalpy-increasing auxiliary path, respectively. The refrigerant in the enthalpy-increasing auxiliary path is throttled and cooled by the second throttling device 23, and can more efficiently absorb heat from the refrigerant in the main refrigerant path in the heat exchanger 22. After absorbing heat, the refrigerant is vaporized and enters the enthalpy-increasing port 111 of the compressor 11, thereby further reducing the temperature of the refrigerant in the main refrigerant path. This can improve the refrigeration effect of the terminal equipment in the refrigeration mode and improve the heating capacity of the refrigerant in the low-temperature condition in the heating mode.

[0095] It can be understood that, in some embodiments, if the length and complexity of the pipeline are not considered, the compressor 11 can not be provided with the enthalpy-increasing port 111, and the refrigerant in the enthalpy-increasing auxiliary path can be directly introduced into the low-pressure gas-liquid separator 33 to enter the compressor 11.

[0096] Specifically, the refrigerant in the main refrigerant path is cooled by heat exchange, and then further cooled by the third throttling device 24 before entering the second refrigerant port 152 or the fourth refrigerant port 162, thereby improving the heat absorption performance of the refrigerant, i.e., improving the refrigeration effect of the system.

[0097] In some embodiments, as shown in FIG. 2, the economizer is provided with the enthalpy-increasing port 111. Figure 1As shown, the heat pump system further comprises a first one-way valve 25, a second one-way valve 26, a third one-way valve 27 and a fourth one-way valve 28. The first end of the economizer is connected to the liquid outlet 202 of the liquid storage container 20 via the first one-way valve 25, and is connected to the second refrigerant port 152 via the second one-way valve 26, the first one-way valve 25 and the second one-way valve 26 being in the direction of the first end of the economizer. The second end of the economizer is connected to the second refrigerant port 152 via the third one-way valve 27, and is connected to the fourth refrigerant port 162 via the fourth one-way valve 28, the third one-way valve 27 being in the direction of the second refrigerant port 152, and the fourth one-way valve 28 being in the direction of the fourth refrigerant port 162. The direction herein refers to the flow direction of the refrigerant, not the spatial orientation.

[0098] In some embodiments, as shown in FIG. 1, the heat pump system further comprises a first water pump 30, which is arranged in the water inlet pipeline (the pipeline connecting the water outlet 292 and the first water inlet 123) or the water outlet pipeline (the pipeline connecting the first water outlet 124 and the water return port 293) of the heat recovery heat exchanger 12, and is used to provide power for the water circulation between the heat recovery heat exchanger 12 and the domestic water tank 29. Figure 1 As shown, the heat recovery heat exchanger 12 further comprises a first water inlet 123 and a first water outlet 124 connected to the first water inlet 123. The heat pump system further comprises a domestic water tank 29 for storing domestic water, the domestic water tank 29 being connected to the first water inlet 123 and the first water outlet 124 respectively, and all or at least part of the heat of the refrigerant output by the compressor 11 being exchanged with the water in the domestic water tank 29 in the heat recovery heat exchanger 12 to prepare hot water. Specifically, the domestic water tank 29 comprises a cold water inlet 291, a water outlet 292, a water return port 293 and a hot water outlet 294, the water outlet 292 being connected to the first water inlet 123, and the first water outlet 124 being connected to the water return port 293.

[0099] In some embodiments, the heat pump system further comprises a first water pump 30, which is arranged in the water inlet pipeline (the pipeline connecting the water outlet 292 and the first water inlet 123) or the water outlet pipeline (the pipeline connecting the first water outlet 124 and the water return port 293) of the heat recovery heat exchanger 12, and is used to provide power for the water circulation between the heat recovery heat exchanger 12 and the domestic water tank 29.

[0100] Specifically, hot water is prepared while refrigerating in summer, if water is initially 30℃ and the target is heated to 60℃, the waste heat recovery mode can be used, but the heating speed of hot water is slow. Therefore, in order to solve the problem that the heating speed of hot water is slow in the refrigeration and waste heat recovery modes, and the liquid refrigerant directly flows in the main pipeline after heat exchange, which affects the switching of the second reversing valve 21 and causes the system to be abnormal, the full heat recovery mode is provided, all the heat of the refrigerant output by the compressor 11 is exchanged with the water in the domestic water tank 29 in the heat recovery heat exchanger 12, which can improve the heating speed of hot water, quickly prepare hot water, and the refrigerant becomes liquid refrigerant after coming out of the first refrigerant outlet 122, then passes through the second refrigerant inlet 141 and the third refrigerant outlet 143, and then enters the fourth refrigerant port 162 through the first throttling device 17. When the temperature of the water reaches the preset value (for example, 50℃), at this time, the waste heat recovery mode can be switched due to the small temperature difference between the refrigerant and the water. If the water is initially 50℃ and the target is heated to 60℃, the waste heat recovery mode can be directly used. It should be noted that the above-mentioned temperature data is only for example and does not limit the present application.

[0101] In some embodiments, the heat pump system further comprises an end device 31, and the air conditioner side heat exchanger 16 is used to realize heat exchange between the refrigerant and the water in the end device 31, so the air conditioner side heat exchanger 16 further comprises a second water inlet 163 and a second water outlet 164 connected with the second water inlet 163, the outlet of the end device 31 is connected with the second water inlet 163 of the air conditioner side heat exchanger 16, and the second water outlet 164 of the air conditioner side heat exchanger 16 is connected with the inlet of the end device 31.

[0102] The end device 31 can comprise a fan disc and / or floor heating installed indoors, and further can comprise a hydraulic module connected between the air conditioner side heat exchanger 16 and the fan disc and / or floor heating. The fan disc, the floor heating and the hydraulic module are only examples and do not limit the present application.

[0103] In some embodiments, the heat pump system further comprises a second water pump 32, the second water pump 32 is arranged in the water inlet pipeline (the pipeline connecting the outlet of the end device 31 with the second water inlet 163 of the air conditioner side heat exchanger 16) or the water outlet pipeline (the pipeline connecting the second water outlet 164 of the air conditioner side heat exchanger 16 with the inlet of the end device 31) of the air conditioner side heat exchanger 16, and the second water pump 32 is used to provide power for water circulation between the air conditioner side heat exchanger 16 and the end device 31.

[0104] In some embodiments, the heat pump system further comprises a low-pressure gas-liquid separator 33 for separating gaseous refrigerant and liquid refrigerant, which is arranged at an inlet end of the compressor 11.

[0105] In some embodiments, in order to avoid excessive pipeline pressure, the heat pump system further comprises a pressure relief module, which comprises a fifth one-way valve 34, an inlet end of which is connected to an outlet end of the third throttling device 24, and an outlet end of which is connected to the fourth valve port 211. In some embodiments, the inlet end of the fifth one-way valve 34 is also connected to the second refrigerant port 152.

[0106] In detail, as shown in Figure 1 the connection relationship between the above-mentioned components is as follows:

[0107] The outlet of the compressor 11 is connected to the first valve port 131 of the first reversing valve 13, the second valve port 132 of the first reversing valve 13 is connected to the first refrigerant inlet 121 of the heat recovery heat exchanger 12, and the third valve port 133 of the first reversing valve 13 is connected to the fourth valve port 211 of the second reversing valve 21. The water outlet 292 of the domestic water tank 29 is connected to the first water inlet 123 of the heat recovery heat exchanger 12 through the first water pump 30, and the first water outlet 124 of the heat recovery heat exchanger 12 is connected to the water return port 293 of the domestic water tank 29. The first refrigerant outlet 122 of the heat recovery heat exchanger 12 is connected to the second refrigerant inlet 141 of the high-pressure gas-liquid separator 14, the second refrigerant outlet 142 of the high-pressure gas-liquid separator 14 is connected to the fourth valve port 211 of the second reversing valve 21 through the on-off valve 18, and the third refrigerant outlet 143 of the high-pressure gas-liquid separator 14 is connected to the fourth refrigerant port 162 of the air conditioning side heat exchanger 16 and the liquid inlet 201 of the liquid storage container 20 through the first throttling device 17. The outlet of the terminal device 31 is connected to the second water inlet 163 of the air conditioning side heat exchanger 16 through the second water pump 32, and the second water outlet 164 of the air conditioning side heat exchanger 16 is connected to the inlet of the terminal device 31. The fifth valve port 212 of the second reversing valve 21 is connected to the first refrigerant port 151 of the outdoor side heat exchanger 15, the sixth valve port 213 of the second reversing valve 21 is connected to the third refrigerant port 161 of the air conditioning side heat exchanger 16, and the seventh valve port 214 of the second reversing valve 21 is connected to the inlet of the compressor 11 through the low-pressure gas-liquid separator 33. One end of the refrigerant main path of the economizer is connected to the liquid outlet 202 of the liquid storage container 20 through the first one-way valve 25, and the other end is connected to the second refrigerant port 152 of the outdoor side heat exchanger 15 through the second one-way valve 26. The other end of the refrigerant main path of the economizer is connected to the second refrigerant port 152 of the outdoor side heat exchanger 15 through the third one-way valve 27, and the other end is connected to the fourth refrigerant port 162 of the air conditioning side heat exchanger 16 through the fourth one-way valve 28. The enthalpy-increasing auxiliary path of the economizer is connected to the enthalpy-increasing port 111 of the compressor 11.

[0108] In different cases, the heat recovery heat pump system corresponds to different connections, as follows:

[0109] As Figure 2As shown, in the refrigeration and total heat recovery hot water mode, the first valve port 131 of the first reversing valve 13 is connected with the second valve port 132, the switch valve 18 is closed, the first throttling device 17 is opened, and the sixth valve port 213 of the second reversing valve 21 is connected with the seventh valve port 214. That is, when hot water needs to be prepared quickly in the refrigeration mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the first refrigerant inlet 121 of the heat recovery heat exchanger 12 through the first valve port 131 and the second valve port 132 of the first reversing valve 13, and the high-temperature gaseous refrigerant exchanges heat with the water in the water tank 29 to become medium-temperature liquid refrigerant after preparing hot water. The medium-temperature liquid refrigerant output from the first refrigerant outlet 122 of the heat recovery heat exchanger 12 enters the second refrigerant inlet 141 of the high-pressure gas-liquid separator 14, and further gas-liquid separation is performed in the high-pressure gas-liquid separator 14 to ensure that the refrigerant output from the third refrigerant outlet 143 is pure liquid. The medium-temperature liquid refrigerant output from the third refrigerant outlet 143 becomes low-temperature liquid refrigerant after being throttled and cooled by the first throttling device 17, and then enters the fourth refrigerant port 162 of the air conditioning side heat exchanger 16. The low-temperature liquid refrigerant exchanges heat with the circulating water in the terminal device 31 in the air conditioning side heat exchanger 16, and the low-temperature liquid refrigerant absorbs the heat of the circulating water and evaporates to become low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the third refrigerant port 161 of the air conditioning side heat exchanger 16 enters the low-pressure gas-liquid separator 33 through the sixth valve port 213 and the seventh valve port 214 of the second reversing valve 21, and then returns to the inlet of the compressor 11 to reciprocate. The heat recovery heat exchanger 12 is connected with the water tank 29, so that all the condensation heat of the outdoor heat exchanger 15 is recovered and utilized when refrigeration is performed in summer, and the energy utilization rate is improved.

[0110] As Figure 3As shown, in the refrigeration and waste heat recovery mode, the first valve port 131 of the first reversing valve 13 is connected with the second valve port 132, the switch valve 18 is opened, the first throttling device 17, the second throttling device 23 and the third throttling device 24 are opened, the fourth valve port 211 of the second reversing valve 21 is connected with the fifth valve port 212, and the sixth valve port 213 of the second reversing valve 21 is connected with the seventh valve port 214. That is, when hot water needs to be prepared in the refrigeration mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the first refrigerant inlet 121 of the heat recovery heat exchanger 12 through the first valve port 131 and the second valve port 132 of the first reversing valve 13, and the high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 29 in the heat recovery heat exchanger 12, and becomes medium-temperature gaseous refrigerant after preparing hot water. The medium-temperature gaseous refrigerant output from the first refrigerant outlet 122 of the heat recovery heat exchanger 12 enters the second refrigerant inlet 141 of the high-pressure gas-liquid separator 14, and further gas-liquid separation is performed in the high-pressure gas-liquid separator 14 to ensure that the refrigerant output from the second refrigerant outlet 142 is pure gas, and the refrigerant output from the third refrigerant outlet 143 is pure liquid. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 142 enters the first refrigerant port 151 of the outdoor heat exchanger 15 through the fourth valve port 211 and the fifth valve port 212 of the second reversing valve 21, and becomes medium-temperature liquid refrigerant after condensing and releasing heat in the outdoor heat exchanger 15. The medium-temperature liquid refrigerant output from the second refrigerant port 152 of the outdoor heat exchanger 15 passes through the second check valve 26, and then passes through the refrigerant main path and the enthalpy-increasing auxiliary path, respectively. The medium-temperature liquid refrigerant in the enthalpy-increasing auxiliary path is throttled and cooled by the second throttling device 23 to become low-temperature liquid refrigerant, and the low-temperature liquid refrigerant becomes relatively low-temperature low-temperature gaseous refrigerant after absorbing heat from the refrigerant in the refrigerant main path in the heat exchanger 22, and finally enters the enthalpy-increasing port 111 of the compressor 11. The medium-temperature liquid refrigerant in the refrigerant main path is cooled by heat exchange to become low-temperature liquid refrigerant, and then is further throttled and cooled by the third throttling device 24 to become low-temperature liquid refrigerant with a lower temperature, and then enters the fourth refrigerant port 162 of the air conditioning side heat exchanger 16 through the fourth check valve 28. The medium-temperature liquid refrigerant output from the third refrigerant outlet 143 is throttled and cooled by the first throttling device 17 to become low-temperature liquid refrigerant with a lower temperature, and then enters the fourth refrigerant port 162 of the air conditioning side heat exchanger 16.The low-temperature liquid refrigerant exchanges heat with the circulating water in the terminal device 31 in the air-conditioning side heat exchanger 16, and the low-temperature liquid refrigerant absorbs the heat of the circulating water and evaporates into low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output by the third refrigerant port 161 of the air-conditioning side heat exchanger 16 passes through the sixth valve port 213 and the seventh valve port 214 of the second reversing valve 21, and then returns to the inlet of the compressor 11 through the low-pressure gas-liquid separator 33, and reciprocally circulates. The heat recovery heat exchanger 12 is connected to the domestic water tank 29, so that at least part of the condensation heat of the outdoor side heat exchanger 15 originally used for heat exchange with air is recycled to avoid waste of all heat exchanged with air in the outdoor side heat exchanger 15. The recycled heat is exchanged with the water in the domestic water tank 29 in the heat recovery heat exchanger 12 to prepare hot water, and the energy utilization rate is improved.

[0111] Specifically, Figure 3 and Figure 2 The difference between the embodiments shown in the drawings is that, Figure 3 In order to recycle at least part of the condensation heat of the outdoor side heat exchanger 15 originally used for heat exchange with air, and Figure 2 In order to recycle all of the condensation heat of the outdoor side heat exchanger 15 originally used for heat exchange with air.

[0112] As Figure 4As shown, in the refrigeration and waste heat recovery mode, the first valve port 131 of the first reversing valve 13 is connected with the second valve port 132 and the third valve port 133, the switch valve 18 is opened, the first throttling device 17, the second throttling device 23 and the third throttling device 24 are opened, the fourth valve port 211 of the second reversing valve 21 is connected with the fifth valve port 212, and the sixth valve port 213 of the second reversing valve 21 is connected with the seventh valve port 214. That is, when hot water is needed in the refrigeration mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the first refrigerant inlet 121 of the heat recovery heat exchanger 12 through the first valve port 131 and the second valve port 132 of the first reversing valve 13, and the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the first refrigerant port 151 of the outdoor heat exchanger 15 through the first valve port 131 and the third valve port 133 of the first reversing valve 13 and the fourth valve port 211 and the fifth valve port 212 of the second reversing valve 21. The high-temperature gaseous refrigerant exchanges heat with the water in the water tank 29 in the heat recovery heat exchanger 12, becomes medium-temperature gaseous refrigerant after preparing hot water, and the medium-temperature gaseous refrigerant output from the first refrigerant outlet 122 of the heat recovery heat exchanger 12 enters the second refrigerant inlet 141 of the high-pressure gas-liquid separator 14, and the medium-temperature gaseous refrigerant output from the second refrigerant outlet 142 of the high-pressure gas-liquid separator 14 is separated into pure gaseous refrigerant and pure liquid refrigerant. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 142 enters the first refrigerant port 151 of the outdoor heat exchanger 15 through the fourth valve port 211 and the fifth valve port 212 of the second reversing valve 21, and becomes medium-temperature liquid refrigerant after condensing and releasing heat in the outdoor heat exchanger 15. The medium-temperature liquid refrigerant output from the second refrigerant port 152 of the outdoor heat exchanger 15 enters the refrigerant main path and the enthalpy-increasing auxiliary path through the second check valve 26, the medium-temperature liquid refrigerant in the enthalpy-increasing auxiliary path is throttled and cooled by the second throttling device 23 to become low-temperature liquid refrigerant, the low-temperature liquid refrigerant absorbs heat from the refrigerant in the refrigerant main path in the heat exchanger 22 to become low-temperature gaseous refrigerant, and finally enters the enthalpy-increasing port 111 of the compressor 11. The medium-temperature liquid refrigerant in the refrigerant main path is cooled by heat exchange to become low-temperature liquid refrigerant, and then is further throttled and cooled by the third throttling device 24 to become low-temperature liquid refrigerant with lower temperature, and then enters the fourth refrigerant port 162 of the air conditioning side heat exchanger 16 through the fourth check valve 28. The medium-temperature liquid refrigerant output from the third refrigerant outlet 143 is throttled and cooled by the first throttling device 17 to become low-temperature liquid refrigerant with lower temperature, and then enters the fourth refrigerant port 162 of the air conditioning side heat exchanger 16.The low-temperature liquid refrigerant exchanges heat with the circulating water in the terminal device 31 in the air conditioning side heat exchanger 16, and the low-temperature liquid refrigerant absorbs the heat of the circulating water and evaporates into low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output by the third refrigerant port 161 of the air conditioning side heat exchanger 16 passes through the sixth valve port 213 and the seventh valve port 214 of the second reversing valve 21, and then returns to the inlet of the compressor 11 through the low-pressure gas-liquid separator 33, and reciprocally circulates. The heat recovery heat exchanger 12 is connected to the domestic water tank 29, so that at least part of the condensation heat of the outdoor side heat exchanger 15 originally used for heat exchange with air is recovered and utilized to avoid waste of all heat in the outdoor side heat exchanger 15 and air heat exchange. The recovered heat is exchanged with the water in the domestic water tank 29 in the heat recovery heat exchanger 12 to prepare hot water and improve energy utilization.

[0113] Specifically, Figure 4 and Figure 3 The difference between the embodiment shown in the figure and the embodiment shown in the figure is that Figure 4 In the embodiment shown in the figure, one more refrigerant passes through the first valve port 131 and the third valve port 133 of the first reversing valve 13 and the fourth valve port 211 and the fifth valve port 212 of the second reversing valve 21 into the outdoor side heat exchanger 15, which can better control the amount of refrigerant entering the heat recovery heat exchanger 12, and the refrigerant directly from the compressor 11 to the second reversing valve 21 can ensure that the refrigerant is pure gas. The pure gaseous refrigerant can better ensure that the second reversing valve 21 has enough pressure difference to reverse, so the pressure loss of the refrigerant pipeline is smaller, and the first reversing valve 13 is less affected by impurities, so that the system runs stably.

[0114] As Figure 5As shown, in the heating and hot water mode, the first valve port 131 of the first reversing valve 13 is connected with the second valve port 132, the switch valve 18 is opened, the first throttling device 17, the second throttling device 23 and the third throttling device 24 are opened, the fourth valve port 211 of the second reversing valve 21 is connected with the sixth valve port 213, and the fifth valve port 212 of the second reversing valve 21 is connected with the seventh valve port 214. That is, when hot water needs to be prepared in the heating mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the first refrigerant inlet 121 of the heat recovery heat exchanger 12 through the first valve port 131 and the second valve port 132 of the first reversing valve 13, and the high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 29 in the heat recovery heat exchanger 12 to become medium-temperature gaseous refrigerant after preparing hot water. The medium-temperature gaseous refrigerant output from the first refrigerant outlet 122 of the heat recovery heat exchanger 12 enters the second refrigerant inlet 141 of the high-pressure gas-liquid separator 14, and further gas-liquid separation is performed in the high-pressure gas-liquid separator 14 to ensure that the refrigerant output from the second refrigerant outlet 142 is pure gas, and the refrigerant output from the third refrigerant outlet 143 is pure liquid. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 142 enters the third refrigerant port 161 of the air conditioning side heat exchanger 16 through the fourth valve port 211 and the sixth valve port 213 of the second reversing valve 21, and becomes medium-temperature liquid refrigerant after heat exchange with the circulating water in the terminal device 31 in the air conditioning side heat exchanger 16. The medium-temperature liquid refrigerant output from the fourth refrigerant port 162 of the air conditioning side heat exchanger 16 enters the liquid inlet 201 of the liquid storage container 20, and the medium-temperature liquid refrigerant output from the third refrigerant outlet 143 becomes low-temperature liquid refrigerant after throttling and temperature reduction by the first throttling device 17, and then enters the liquid inlet 201 of the liquid storage container 20. The medium-temperature liquid refrigerant output from the liquid outlet 202 of the liquid storage container 20 passes through the first check valve 25 and then passes through the refrigerant main line and the enthalpy-increasing auxiliary line, respectively. The medium-temperature liquid refrigerant in the enthalpy-increasing auxiliary line becomes low-temperature liquid refrigerant after throttling and temperature reduction by the second throttling device 23, becomes low-temperature gaseous refrigerant after absorbing heat from the refrigerant in the refrigerant main line in the heat exchanger 22, and finally enters the enthalpy-increasing port 111 of the compressor 11. The medium-temperature liquid refrigerant in the refrigerant main line becomes low-temperature liquid refrigerant after heat exchange, and then becomes low-temperature liquid refrigerant with lower temperature after further throttling and temperature reduction by the third throttling device 24, and then enters the second refrigerant port 152 of the outdoor side heat exchanger 15 through the third check valve 27. The low-temperature liquid evaporates and absorbs heat in the outdoor side heat exchanger 15 to become low-temperature gaseous refrigerant.The low-temperature gaseous refrigerant outputted from the first refrigerant port 151 of the outdoor side heat exchanger 15 is circulated back to the inlet of the compressor 11 through the low-pressure gas-liquid separator 33 after passing through the fifth valve port 212 and the seventh valve port 214 of the second reversing valve 21. The heat recovery heat exchanger 12 is connected to the domestic water tank 29, so that hot water can be prepared at the same time of winter heating, improving the energy utilization rate.

[0115] As Figure 6As shown, when in the heating plus hot water mode, the first valve port 131 of the first reversing valve 13 is connected with the second valve port 132 and the third valve port 133, the switch valve 18 is opened, the first throttling device 17, the second throttling device 23 and the third throttling device 24 are opened, the fourth valve port 211 of the second reversing valve 21 is connected with the sixth valve port 213, and the fifth valve port 212 of the second reversing valve 21 is connected with the seventh valve port 214. That is, when hot water needs to be prepared in the heating mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the third refrigerant port 161 of the air conditioning side heat exchanger 16 through the first valve port 131 and the third valve port 133 of the first reversing valve 13 and the fourth valve port 211 and the sixth valve port 213 of the second reversing valve 21. The high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the first refrigerant inlet 121 of the heat recovery heat exchanger 12 through the first valve port 131 and the second valve port 132 of the first reversing valve 13, exchanges heat with the water in the domestic water tank 29 in the heat recovery heat exchanger 12, becomes medium-temperature gaseous refrigerant after preparing hot water, and the medium-temperature gaseous refrigerant output from the first refrigerant outlet 122 of the heat recovery heat exchanger 12 enters the second refrigerant inlet 141 of the high-pressure gas-liquid separator 14, and is further separated into gas and liquid in the high-pressure gas-liquid separator 14 to ensure that the refrigerant output from the second refrigerant outlet 142 is pure gas, and the refrigerant output from the third refrigerant outlet 143 is pure liquid. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 142 enters the third refrigerant port 161 of the air conditioning side heat exchanger 16 through the fourth valve port 211 and the sixth valve port 213 of the second reversing valve 21, and becomes medium-temperature liquid refrigerant after heat exchange with the circulating water in the terminal device 31 in the air conditioning side heat exchanger 16. The medium-temperature liquid refrigerant output from the fourth refrigerant port 162 of the air conditioning side heat exchanger 16 enters the liquid inlet 201 of the liquid storage container 20, and the medium-temperature liquid refrigerant output from the third refrigerant outlet 143 becomes low-temperature liquid refrigerant after throttling and cooling by the first throttling device 17, and then enters the liquid inlet 201 of the liquid storage container 20. The medium-temperature liquid refrigerant output from the liquid outlet 202 of the liquid storage container 20 passes through the refrigerant main road and the enthalpy-increasing auxiliary road respectively after the first one-way valve 25, the medium-temperature liquid refrigerant in the enthalpy-increasing auxiliary road is throttled and cooled by the second throttling device 23 to become low-temperature liquid refrigerant, the low-temperature liquid refrigerant becomes low-temperature gaseous refrigerant with relatively low temperature after absorbing heat from the refrigerant in the refrigerant main road in the heat exchanger 22, and finally enters the enthalpy-increasing port 111 of the compressor 11.The medium-temperature liquid refrigerant in the main refrigerant passage is cooled by heat exchange to become low-temperature liquid refrigerant, is further throttled and cooled by the third throttling device 24 to become low-temperature liquid refrigerant with a lower temperature, then enters the second refrigerant port 152 of the outdoor heat exchanger 15 through the third one-way valve 27, and is evaporated and cooled in the outdoor heat exchanger 15 to become low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output by the first refrigerant port 151 of the outdoor heat exchanger 15 passes through the fifth valve port 212 and the seventh valve port 214 of the second reversing valve 21, then passes through the low-pressure gas-liquid separator 33, and returns to the inlet of the compressor 11 to reciprocate. The heat recovery heat exchanger 12 is connected to the domestic water tank 29, so that hot water can be prepared at the same time of winter heating, and the energy utilization rate is improved.

[0116] Specifically, Figure 6 and Figure 5 The difference between the embodiment shown in the figure and the embodiment shown in the figure is that, Figure 6 In the embodiment shown in the figure, one more path enters the air conditioning heat exchanger 16 through the first valve port 131 and the third valve port 133 of the first reversing valve 13 and the fourth valve port 211 and the sixth valve port 213 of the second reversing valve 21, which can better control the amount of refrigerant entering the heat recovery heat exchanger 12, and the refrigerant from the compressor 11 directly reaches the second reversing valve 21, which can ensure that the refrigerant is gaseous, and the pure gaseous refrigerant can better ensure that the second reversing valve 21 has enough pressure difference for reversing, so the pressure loss of the refrigerant pipeline is small, and the first reversing valve 13 is less affected by impurities, so that the system can run stably.

[0117] As Figure 7As shown, in the pure hot water mode, the first valve port 131 of the first reversing valve 13 is connected with the second valve port 132, the switch valve 18 is closed, the first throttling device 17, the second throttling device 23 and the third throttling device 24 are opened, and the fifth valve port 212 of the second reversing valve 21 is connected with the seventh valve port 214. That is, when only hot water is needed to be prepared, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the first refrigerant inlet 121 of the heat recovery heat exchanger 12 through the first valve port 131 and the second valve port 132 of the first reversing valve 13, and the high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 29 in the heat recovery heat exchanger 12 to prepare hot water, and becomes medium-temperature liquid refrigerant after the hot water is prepared. The medium-temperature liquid refrigerant output from the first refrigerant outlet 122 of the heat recovery heat exchanger 12 enters the second refrigerant inlet 141 of the high-pressure gas-liquid separator 14, and is further separated into gas and liquid in the high-pressure gas-liquid separator 14, so that the refrigerant output from the third refrigerant outlet 143 is pure liquid. The medium-temperature liquid refrigerant output from the third refrigerant outlet 143 is throttled and cooled by the first throttling device 17 to become low-temperature liquid refrigerant with a lower temperature, and then enters the liquid inlet 201 of the liquid storage container 20. The medium-temperature liquid refrigerant output from the liquid outlet 202 of the liquid storage container 20 passes through the first check valve 25, and then passes through the refrigerant main path and the enthalpy-increasing auxiliary path respectively. The medium-temperature liquid refrigerant in the enthalpy-increasing auxiliary path is throttled and cooled by the second throttling device 23 to become low-temperature liquid refrigerant, and the low-temperature liquid refrigerant becomes low-temperature gaseous refrigerant with a relatively low temperature after absorbing heat from the refrigerant in the refrigerant main path in the heat exchanger 22, and finally enters the enthalpy-increasing port 111 of the compressor 11. The medium-temperature liquid refrigerant in the refrigerant main path is cooled by heat exchange to become low-temperature liquid refrigerant, and then is further throttled and cooled by the third throttling device 24 to become low-temperature liquid refrigerant with a lower temperature, and then enters the second refrigerant port 152 of the outdoor heat exchanger 15 through the third check valve 27. The low-temperature liquid in the outdoor heat exchanger 15 is evaporated to become low-temperature gaseous refrigerant after absorbing heat. The low-temperature gaseous refrigerant output from the first refrigerant port 151 of the outdoor heat exchanger 15 passes through the fifth valve port 212 and the seventh valve port 214 of the second reversing valve 21, and then returns to the inlet of the compressor 11 through the low-pressure gas-liquid separator 33, and reciprocates. The heat recovery heat exchanger 12 is connected with the domestic water tank 29, so that all the heat from the compressor 11 can be used to exchange heat with the water in the domestic water tank 29 in the heat recovery heat exchanger 12, and the energy is used purposefully. When the hot water is prepared, the refrigerant circuit is shortened, and the refrigerant does not need to pass through the air conditioner side heat exchanger 16, so that the heat exchange efficiency is higher.

[0118] As Figure 8As shown, in the single refrigeration mode, the first valve port 131 of the first reversing valve 13 is connected to the third valve port 133, the fourth valve port 211 of the second reversing valve 21 is connected to the fifth valve port 212, the sixth valve port 213 of the second reversing valve 21 is connected to the seventh valve port 214, the switch valve 18 and the first throttling device 17 are closed, and the second throttling device 23 and the third throttling device 24 are opened. That is, when the single refrigeration in summer, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the first refrigerant port 151 of the outdoor heat exchanger 15 through the first valve port 131 and the third valve port 133 of the first reversing valve 13 and the fourth valve port 211 and the fifth valve port 212 of the second reversing valve 21. The high-temperature gaseous refrigerant condenses and releases heat in the outdoor heat exchanger 15 to become medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the second refrigerant port 152 of the outdoor heat exchanger 15 passes through the second check valve 26 and then passes through the main refrigerant path and the enthalpy-increasing auxiliary path, respectively. The medium-temperature liquid refrigerant in the enthalpy-increasing auxiliary path is throttled and cooled by the second throttling device 23 to become low-temperature liquid refrigerant. The low-temperature liquid refrigerant absorbs heat from the refrigerant in the main refrigerant path in the heat exchanger 22 to become low-temperature gaseous refrigerant, which finally enters the enthalpy-increasing port 111 of the compressor 11. The medium-temperature liquid refrigerant in the main refrigerant path is cooled by heat exchange to become low-temperature liquid refrigerant, which is further throttled and cooled by the third throttling device 24 to become low-temperature liquid refrigerant with a lower temperature, and then enters the fourth refrigerant port 162 of the air conditioning heat exchanger 16 through the fourth check valve 28. The low-temperature liquid refrigerant exchanges heat with the circulating water in the terminal device 31 in the air conditioning heat exchanger 16, and the low-temperature liquid refrigerant absorbs heat from the circulating water to evaporate into low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the third refrigerant port 161 of the air conditioning heat exchanger 16 passes through the sixth valve port 213 and the seventh valve port 214 of the second reversing valve 21 and then returns to the inlet of the compressor 11 through the low-pressure gas-liquid separator 33 to circulate repeatedly.

[0119] As Figure 9As shown, in the single refrigeration mode, the first valve port 131 of the first reversing valve 13 is connected with the second valve port 132, the fourth valve port 211 of the second reversing valve 21 is connected with the fifth valve port 212, the sixth valve port 213 of the second reversing valve 21 is connected with the seventh valve port 214, the switch valve 18 is opened, the first throttling device 17 is closed, and the second throttling device 23 and the third throttling device 24 are opened. At this time, the refrigerant pipeline of the heat recovery heat exchanger 12 does not perform heat exchange and only serves as a passage. That is, when the single refrigeration in summer, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the second refrigerant inlet 141 of the high-pressure gas-liquid separator 14 through the first valve port 131 and the second valve port 132 of the first reversing valve 13 and the first refrigerant inlet 121 and the first refrigerant outlet 122 of the heat recovery heat exchanger 12, and the high-temperature gaseous refrigerant output from the second refrigerant outlet 142 after gas-liquid separation enters the first refrigerant port 151 of the outdoor heat exchanger 15 through the switch valve 18 and the fourth valve port 211 and the fifth valve port 212 of the second reversing valve 21. The high-temperature gaseous refrigerant is condensed and releases heat in the outdoor heat exchanger 15 to become medium-temperature liquid refrigerant, and the medium-temperature liquid refrigerant output from the second refrigerant port 152 of the outdoor heat exchanger 15 passes through the second check valve 26 and then passes through the refrigerant main line and the enthalpy-increasing auxiliary line, respectively. The medium-temperature liquid refrigerant in the enthalpy-increasing auxiliary line is throttled and cooled by the second throttling device 23 to become low-temperature liquid refrigerant, and the low-temperature liquid refrigerant becomes relatively low-temperature low-temperature gaseous refrigerant after absorbing heat from the refrigerant in the refrigerant main line in the heat exchanger 22, and finally enters the enthalpy-increasing port 111 of the compressor 11. The medium-temperature liquid refrigerant in the refrigerant main line is cooled by heat exchange to become low-temperature liquid refrigerant, and then is further throttled and cooled by the third throttling device 24 to become low-temperature liquid refrigerant with lower temperature, and then enters the fourth refrigerant port 162 of the air conditioning side heat exchanger 16 through the fourth check valve 28. The low-temperature liquid refrigerant exchanges heat with the circulating water in the terminal device 31 in the air conditioning side heat exchanger 16, and the low-temperature liquid refrigerant absorbs heat from the circulating water to evaporate into low-temperature gaseous refrigerant, and the low-temperature gaseous refrigerant output from the third refrigerant port 161 of the air conditioning side heat exchanger 16 passes through the second reversing valve 21 and the seventh valve port 214, and then returns to the inlet of the compressor 11 through the low-pressure gas-liquid separator 33, and reciprocally circulates.

[0120] As Figure 10As shown, in the single heating mode, the first valve port 131 of the first reversing valve 13 is connected with the third valve port 133, the fourth valve port 211 of the second reversing valve 21 is connected with the sixth valve port 213, the fifth valve port 212 of the second reversing valve 21 is connected with the seventh valve port 214, the switch valve 18 and the first throttling device 17 are closed, and the second throttling device 23 and the third throttling device 24 are opened. That is, when the single heating mode is used in winter, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the third refrigerant port 161 of the air conditioning side heat exchanger 16 through the first valve port 131 and the third valve port 133 of the first reversing valve 13 and the fourth valve port 211 and the sixth valve port 213 of the second reversing valve 21, and the high-temperature gaseous refrigerant becomes medium-temperature liquid refrigerant after heat exchange with the circulating water in the terminal device 31 in the air conditioning side heat exchanger 16. The medium-temperature liquid refrigerant output from the fourth refrigerant port 162 of the air conditioning side heat exchanger 16 enters the liquid inlet 201 of the liquid storage container 20, and the medium-temperature liquid refrigerant output from the liquid outlet 202 of the liquid storage container 20 passes through the first check valve 25 and then passes through the main refrigerant path and the enthalpy-increasing auxiliary path, respectively. The medium-temperature liquid refrigerant in the enthalpy-increasing auxiliary path is throttled and cooled by the second throttling device 23 to become low-temperature liquid refrigerant, and the low-temperature liquid refrigerant becomes relatively low-temperature low-temperature gaseous refrigerant after absorbing heat from the refrigerant in the main refrigerant path in the heat exchanger 22, and finally enters the enthalpy-increasing port 111 of the compressor 11. The medium-temperature liquid refrigerant in the main refrigerant path is cooled by heat exchange to become low-temperature liquid refrigerant, and then is further throttled and cooled by the third throttling device 24 to become low-temperature liquid refrigerant with a lower temperature, and then enters the second refrigerant port 152 of the outdoor side heat exchanger 15 through the third check valve 27. The low-temperature liquid is evaporated and absorbs heat in the outdoor side heat exchanger 15 to become low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the first refrigerant port 151 of the outdoor side heat exchanger 15 passes through the fifth valve port 212 and the seventh valve port 214 of the second reversing valve 21 and then returns to the inlet of the compressor 11 through the low-pressure gas-liquid separator 33 to reciprocate and circulate.

[0121] As Figure 11As shown, in the single heating mode, the first valve port 131 of the first reversing valve 13 is connected with the second valve port 132, the fourth valve port 211 of the second reversing valve 21 is connected with the sixth valve port 213, the fifth valve port 212 of the second reversing valve 21 is connected with the seventh valve port 214, the switch valve 18 is opened, the first throttling device 17 is closed, and the second throttling device 23 and the third throttling device 24 are opened. At this time, the refrigerant pipeline of the heat recovery heat exchanger 12 does not perform heat exchange and only serves as a passage. That is, when the single heating mode is used in winter, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the second refrigerant inlet 141 of the high-pressure gas-liquid separator 14 through the first valve port 131 and the second valve port 132 of the first reversing valve 13 and the first refrigerant inlet 121 and the first refrigerant outlet 122 of the heat recovery heat exchanger 12. After gas-liquid separation, the high-temperature gaseous refrigerant output from the second refrigerant outlet 142 enters the third refrigerant port 161 of the air conditioning side heat exchanger 16 through the switch valve 18 and the fourth valve port 211 and the sixth valve port 213 of the second reversing valve 21. After heat exchange with the circulating water in the terminal device 31 in the air conditioning side heat exchanger 16, the high-temperature gaseous refrigerant becomes medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the fourth refrigerant port 162 of the air conditioning side heat exchanger 16 enters the liquid inlet 201 of the liquid storage container 20. The medium-temperature liquid refrigerant output from the liquid outlet 202 of the liquid storage container 20 enters the refrigerant main pipeline and the enthalpy-increasing auxiliary pipeline through the first check valve 25. The medium-temperature liquid refrigerant in the enthalpy-increasing auxiliary pipeline is throttled and cooled by the second throttling device 23 to become low-temperature liquid refrigerant. After absorbing the heat of the refrigerant in the refrigerant main pipeline in the heat exchanger 22, the low-temperature liquid refrigerant becomes relatively low-temperature low-temperature gaseous refrigerant and finally enters the enthalpy-increasing port 111 of the compressor 11. The medium-temperature liquid refrigerant in the refrigerant main pipeline is cooled by heat exchange to become low-temperature liquid refrigerant, and then is further throttled and cooled by the third throttling device 24 to become low-temperature liquid refrigerant with a lower temperature. Then, the low-temperature liquid refrigerant enters the second refrigerant port 152 of the outdoor side heat exchanger 15 through the third check valve 27. After evaporation and heat absorption in the outdoor side heat exchanger 15, the low-temperature liquid refrigerant becomes low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the first refrigerant port 151 of the outdoor side heat exchanger 15 enters the low-pressure gas-liquid separator 33 through the fifth valve port 212 and the seventh valve port 214 of the second reversing valve 21 and then returns to the inlet of the compressor 11 to perform circulation.

[0122] It should be noted that the above high, medium and low temperatures are only relative descriptions, and the gaseous refrigerant can also refer to the gas-liquid two-phase state or gaseous state, which is not limited herein.

[0123] In some other embodiments, the first one-way valve 25, the second one-way valve 26, the third one-way valve 27, the fourth one-way valve 28 and the fifth one-way valve 34 can be replaced by a first on-off valve, a second on-off valve, a third on-off valve, a fourth on-off valve and a fifth on-off valve. For example, the first on-off valve, the second on-off valve, the third on-off valve, the fourth on-off valve and the fifth on-off valve are solenoid valves, which are only examples and do not limit the present application, and other valves can also be used.

[0124] In different modes, the on-off states of the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are as follows:

[0125] In the above refrigeration and waste heat recovery hot water mode and the single refrigeration mode, the first on-off valve and the third on-off valve are closed, and the second on-off valve and the fourth on-off valve are opened.

[0126] In the above heating and hot water mode, single heating mode and pure hot water mode, the first on-off valve and the third on-off valve are opened, and the second on-off valve and the fourth on-off valve are closed.

[0127] By implementing the present application, the following advantages are achieved:

[0128] In the present embodiment, the high-pressure gas-liquid separator 14 is arranged at the refrigerant outlet end of the heat recovery heat exchanger 12. By using gas-liquid separation, automatic refrigerant flow direction can be achieved when switching between the refrigeration and full heat recovery hot water mode and the refrigeration and waste heat recovery hot water mode, and when switching between the heating and hot water mode and the pure hot water mode, thereby improving the stability of the system.

[0129] It can be understood that the above embodiments only express some embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present application. It should be noted that for those skilled in the art, the above embodiments or technical features can be freely combined without departing from the concept of the present application, and some modifications and improvements can also be made, which all belong to the protection scope of the present application, i.e. the embodiments described in "in some embodiments" can be freely combined with any of the above and below embodiments. Therefore, any equivalent transformation and modification within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

1. A heat pump system, characterized in that, include: The compressor is used to compress refrigerant; A heat recovery heat exchanger, the heat recovery heat exchanger including a first refrigerant inlet and a first refrigerant outlet connected to the first refrigerant inlet; The first reversing valve is used to regulate the amount of refrigerant entering the heat recovery heat exchanger; A high-pressure gas-liquid separator includes a second refrigerant inlet, a second refrigerant outlet connected to the second refrigerant inlet, and a third refrigerant outlet connected to the second refrigerant inlet; the second refrigerant outlet is used to output gaseous refrigerant after gas-liquid separation, and the third refrigerant outlet is used to output liquid refrigerant after gas-liquid separation. An outdoor heat exchanger, the outdoor heat exchanger including a first refrigerant port and a second refrigerant port connected to the first refrigerant port; An air conditioning side heat exchanger, the air conditioning side heat exchanger includes a third refrigerant port and a fourth refrigerant port connected to the third refrigerant port; as well as, First throttling device; The compressor outlet is connected to the first refrigerant inlet via the first reversing valve, and the compressor outlet is connected to the first refrigerant port and the third refrigerant port via the first reversing valve. The first refrigerant outlet is connected to the second refrigerant inlet; The second refrigerant outlet is connected to the first refrigerant port and the third refrigerant port; The third refrigerant outlet is connected to the second refrigerant port and the fourth refrigerant port via the first throttling device. The second refrigerant port is connected to the fourth refrigerant port. The third refrigerant port and the first refrigerant port are connected to the inlet of the compressor.

2. The heat pump system according to claim 1, characterized in that, The heat pump system also includes: A switching valve is provided, and the second refrigerant outlet is connected to the first refrigerant port and the third refrigerant port via the switching valve.

3. The heat pump system according to claim 1, characterized in that, The piping between the first throttling device and the fourth refrigerant port is at least partially a capillary tube.

4. The heat pump system according to claim 1, characterized in that, The heat pump system also includes: A liquid storage container, wherein the inlet of the liquid storage container is connected to the fourth refrigerant port, the outlet of the liquid storage container is connected to the second refrigerant port, and the third refrigerant outlet is connected between the fourth refrigerant port and the inlet of the liquid storage container via the first throttling device.

5. The heat pump system according to claim 1, characterized in that, When the compressor outlet is connected to the first refrigerant inlet via the first reversing valve, and the third refrigerant outlet is connected to the fourth refrigerant port via the first throttling device, the refrigerant, after exiting the compressor, forms a refrigeration refrigerant circuit through the first reversing valve, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, the third refrigerant outlet, the first throttling device, the fourth refrigerant port, and the third refrigerant port. At the same time, all the heat of the refrigerant is exchanged in the heat recovery heat exchanger. When the compressor outlet is connected to the first refrigerant inlet via the first reversing valve, and the second refrigerant outlet is connected to the first refrigerant port, and the third refrigerant outlet is connected to the fourth refrigerant port via the first throttling device, the refrigerant exits from the compressor and enters the second refrigerant inlet via the first reversing valve, the first refrigerant inlet, and the first refrigerant outlet. After gas-liquid separation, the gaseous refrigerant enters the fourth refrigerant port via the second refrigerant outlet, the first refrigerant port, and the second refrigerant port, while the liquid refrigerant enters the fourth refrigerant port via the third refrigerant outlet and the first throttling device, forming a refrigerant circuit for refrigeration. At the same time, at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger.

6. The heat pump system according to claim 1, characterized in that, The compressor outlet is connected to the first refrigerant inlet via the first reversing valve, and the second refrigerant outlet is connected to the third refrigerant port. When the third refrigerant outlet is connected to the second refrigerant port via the first throttling device, the refrigerant exits from the compressor and enters the second refrigerant inlet via the first reversing valve, the first refrigerant inlet, and the first refrigerant outlet. After gas-liquid separation, the gaseous refrigerant enters the second refrigerant port via the second refrigerant outlet, the third refrigerant port, and the fourth refrigerant port, while the liquid refrigerant enters the second refrigerant port via the third refrigerant outlet and the first throttling device, forming a heating refrigerant circuit. At the same time, at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger. When the compressor outlet is connected to the first refrigerant inlet via the first reversing valve, and the third refrigerant outlet is connected to the second refrigerant port via the first throttling device, the refrigerant exiting the compressor forms a pure hot water refrigerant circuit through the first reversing valve, the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, the third refrigerant outlet, the first throttling device, the second refrigerant port, and the first refrigerant port. At the same time, all the heat of the refrigerant is exchanged in the heat recovery heat exchanger.

7. The heat pump system according to claim 1, characterized in that, The first reversing valve includes a first valve port, a second valve port, and a third valve port; The first valve port is connected to the outlet of the compressor, the second valve port is connected to the first refrigerant inlet, and the third valve port is connected to both the first refrigerant port and the third refrigerant port. When the first valve port is connected to the second valve port, the compressor outlet is connected to the first refrigerant inlet. When the first valve port is connected to the third valve port, the compressor outlet is connected to either the first refrigerant port or the third refrigerant port.

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

9. The heat pump system according to claim 1, characterized in that, The heat pump system also includes: An economizer, wherein the first end of the economizer is connected to the second refrigerant port, the fourth refrigerant port and the third refrigerant outlet, and the second end of the economizer is connected to the fourth refrigerant port and the second refrigerant port.

10. The heat pump system according to claim 1, characterized in that, The heat recovery heat exchanger further includes a first water inlet and a first water outlet connected to the first water inlet; The heat pump system also includes: A domestic water tank is connected to the first water inlet and the first water outlet.

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