Heat pump system

Abstract

The invention discloses a heat pump system which comprises a compressor, a low-pressure gas-liquid separator, an outdoor heat exchanger, an indoor unit, a high-pressure gas-liquid separator and a heat recovery branch. And an outlet of the low-pressure gas-liquid separator is connected with an inlet of the compressor. The outdoor heat exchanger comprises a first refrigerant port and a second refrigerant port which are communicated, and the first refrigerant port is connected with an outlet of the compressor and an inlet of the low-pressure gas-liquid separator. The indoor unit comprises a third refrigerant port and a fourth refrigerant port which are communicated, the third refrigerant port is connected with the second refrigerant port, and the fourth refrigerant port is connected with an outlet of the compressor and an inlet of the low-pressure gas-liquid separator. The high-pressure gas-liquid separator comprises a first refrigerant inlet and a first refrigerant outlet which are communicated with each other, the first refrigerant outlet is used for outputting a liquid refrigerant after gas-liquid separation, the first refrigerant inlet is connected with an outlet of the compressor, and one path of the first refrigerant outlet is connected with the second refrigerant port and the third refrigerant port; and the other path is connected with an inlet of the low-pressure gas-liquid separator through a heat recovery branch. The pressure balance of the system can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a heat pump system. Background Art

[0002] In order to increase the stability of the system, HVAC equipment in related technologies may consider adding a high-pressure gas-liquid separator. However, after adding the high-pressure gas-liquid separator, problems such as oil accumulation or refrigerant migration may occur. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a heat pump system in view of at least one defect of the related technology mentioned in the above background technology: after the HVAC equipment of the related technology adds a high-pressure gas-liquid separator, problems of oil accumulation and refrigerant migration may occur.

[0004] The technical solution adopted by the present invention to solve the technical problem is: construct a heat pump system, including:

[0005] A compressor, the compressor being used to compress the refrigerant;

[0006] A low-pressure gas-liquid separator, the outlet of which is connected to the inlet of the compressor;

[0007] An outdoor heat exchanger, the outdoor heat exchanger comprising a first refrigerant port and a second refrigerant port, the first refrigerant port being in communication with the second refrigerant port, the first refrigerant port being respectively connected to the outlet of the compressor and the inlet of the low-pressure gas-liquid separator;

[0008] At least one indoor unit, the indoor unit comprising a third refrigerant port and a fourth refrigerant port, the third refrigerant port being communicated with the fourth refrigerant port, the third refrigerant port being connected with the second refrigerant port, and the fourth refrigerant port being respectively connected with the outlet of the compressor and the inlet of the low-pressure gas-liquid separator;

[0009] A high-pressure gas-liquid separator and a heat recovery branch, the high-pressure gas-liquid separator includes a first refrigerant inlet and a first refrigerant outlet, the first refrigerant inlet is communicated with the first refrigerant outlet, the first refrigerant inlet is connected to the outlet of the compressor, one path of the first refrigerant outlet is used to output the liquid refrigerant after gas-liquid separation, one path of the first refrigerant outlet is respectively connected to the second refrigerant port and the third refrigerant port, and the other path of the first refrigerant outlet is connected to the inlet of the low-pressure gas-liquid separator via the heat recovery branch.

[0010] In some embodiments, at least a portion of the heat recovery branch is a capillary tube; and / or at least a portion of the pipeline of the first refrigerant outlet is a capillary tube.

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

[0012] A branch valve is provided on the heat recovery branch.

[0013] In some embodiments, the heat pump system further comprises:

[0014] A filtering device is provided on a pipeline of the first refrigerant outlet, and is used for filtering impurities.

[0015] In some embodiments, the high-pressure gas-liquid separator further includes a second refrigerant outlet, the first refrigerant inlet is connected to the second refrigerant outlet, and the second refrigerant outlet is used to output the gaseous refrigerant after gas-liquid separation;

[0016] The heat pump system further comprises:

[0017] A heat recovery heat exchanger, the heat recovery heat exchanger is used to realize heat exchange between the refrigerant and the heat storage medium to store heat, the heat recovery heat exchanger comprises a second refrigerant inlet and a third refrigerant outlet, the second refrigerant inlet is connected to the third refrigerant outlet;

[0018] The outlet of the compressor is connected to the second refrigerant inlet, the third refrigerant outlet is connected to the first refrigerant inlet, and the second refrigerant outlet is connected to the first refrigerant port and the fourth refrigerant port respectively.

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

[0020] A first switch valve, one outlet of the compressor is connected to the second refrigerant inlet through the first switch valve, and another outlet of the compressor is connected to the first refrigerant port and the fourth refrigerant port respectively.

[0021] In some embodiments, the heat pump system further comprises:

[0022] The first reversing valve, the second refrigerant outlet is connected to the first refrigerant port and the fourth refrigerant port respectively through the first reversing valve.

[0023] In some embodiments, the heat pump system further comprises:

[0024] The first refrigerant flow regulating device, the first refrigerant outlet is connected to the second refrigerant port and the third refrigerant port respectively through the first refrigerant flow regulating device.

[0025] In some embodiments, the heat pump system further comprises:

[0026] A second refrigerant flow regulating device and a heat exchanger, the heat exchanger comprising a fifth refrigerant port, a sixth refrigerant port, a seventh refrigerant port and an eighth refrigerant port; the fifth refrigerant port is connected to the sixth refrigerant port to form an enthalpy increase main path; one end of the second refrigerant flow regulating device is connected to the pipeline between the third refrigerant port and the fifth refrigerant port, the other end of the second refrigerant flow regulating device is connected to the eighth refrigerant port via the seventh refrigerant port to form an enthalpy increase auxiliary path, and the eighth refrigerant port is connected to the inlet of the low-pressure gas-liquid separator.

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

[0028] The second switch valve and the third switch valve, the eighth refrigerant port is connected to the inlet of the low-pressure gas-liquid separator through the second switch valve, and the eighth refrigerant port is connected to the enthalpy increase port of the compressor through the third switch valve.

[0029] By implementing the present invention, the following beneficial effects are achieved:

[0030] The present invention provides the heat recovery branch between the first refrigerant outlet of the high-pressure gas-liquid separator and the inlet of the low-pressure gas-liquid separator. The heat recovery branch can realize the oil return of the accumulated oil in the high-pressure gas-liquid separator on the one hand, and release the refrigerant migrated into the high-pressure gas-liquid separator and perform pressure relief on the other hand, thereby improving the pressure balance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0032] Figure 1 is a schematic diagram of a heat pump system of the present invention;

[0033] Figure 2 It is a schematic diagram of the refrigerant flow direction of the heat pump system of the present invention in which hot water is prepared through a full heat recovery mode while refrigerating;

[0034] Figure 3 Schematic diagram of the flow direction of the first refrigerant in the heat pump system of the present invention for preparing hot water through a waste heat recovery mode while cooling;

[0035] Figure 4 Schematic diagram of the flow direction of the second refrigerant in the heat pump system of the present invention for preparing hot water through the waste heat recovery mode while cooling;

[0036] Figure 5 Schematic diagram of the flow direction of the first refrigerant in the heat pump system of the present invention when preparing hot water while heating;

[0037] Figure 6Schematic diagram of the flow direction of the second refrigerant in the heat pump system of the present invention when preparing hot water while heating;

[0038] Figure 7 It is a schematic diagram of the refrigerant flow direction of the heat pump system of the present invention when preparing hot water only;

[0039] Figure 8 It is a schematic diagram of the refrigerant flow direction of the heat pump system of the present invention during refrigeration;

[0040] Fig. 9 It is a schematic diagram of the refrigerant flow direction of the heat pump system of the present invention during heating. DETAILED DESCRIPTION

[0041] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0043] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, "multiple" means two or more.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "located at", and "located at" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, or a chemical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] It should be noted here that the connection between the following ports, between ports and components, or between components is only a physical structural connection, and does not uniquely limit the connectivity relationship and refrigerant flow relationship therein.

[0046] like Figure 1 As shown, some embodiments of the present invention disclose a heat pump system, including a compressor 11, a low-pressure gas-liquid separator 12, an outdoor heat exchanger 13, at least one indoor unit 14, a high-pressure gas-liquid separator 15 and a heat recovery branch 16. It can be understood that the at least one unit can be one, two, three or any number. The heat pump system is specifically as follows:

[0047] The compressor 11 is used to compress the refrigerant. The low-pressure gas-liquid separator 12 is used to separate the gaseous refrigerant from the liquid refrigerant, and the outlet of the low-pressure gas-liquid separator 12 is connected to the inlet of the compressor 11 .

[0048] The outdoor heat exchanger 13 is used to realize heat exchange between the refrigerant and the outside air. The outdoor heat exchanger 13 includes a first refrigerant port 131 and a second refrigerant port 132. The first refrigerant port 131 is connected to the second refrigerant port 132. The first refrigerant port 131 is respectively connected to the outlet of the compressor 11 and the inlet of the low-pressure gas-liquid separator 12.

[0049] The indoor unit 14 is used to realize heat exchange between the refrigerant and the indoor air. The indoor unit 14 includes a third refrigerant port 141 and a fourth refrigerant port 142. The third refrigerant port 141 is connected to the fourth refrigerant port 142. The third refrigerant port 141 is connected to the second refrigerant port 132. The fourth refrigerant port 142 is respectively connected to the outlet of the compressor 11 and the inlet of the low-pressure gas-liquid separator 12.

[0050] The high-pressure gas-liquid separator 15 is used to separate gaseous refrigerant and liquid refrigerant. The high-pressure gas-liquid separator 15 includes a first refrigerant inlet 151 and a first refrigerant outlet 152. The first refrigerant inlet 151 is connected to the first refrigerant outlet 152. The first refrigerant inlet 151 is connected to the outlet of the compressor 11. The first refrigerant outlet 152 is used to output the liquid refrigerant after gas-liquid separation. The first refrigerant outlet 152 is connected to the second refrigerant port 132 and the third refrigerant port 141 respectively. The first refrigerant outlet 152 is connected to the inlet of the low-pressure gas-liquid separator 12 through the heat recovery branch 16.

[0051] In this embodiment, the heat recovery branch 16 is provided between the first refrigerant outlet 152 of the high-pressure gas-liquid separator 15 and the inlet of the low-pressure gas-liquid separator 12. The heat recovery branch 16 can realize the oil return of the accumulated oil in the high-pressure gas-liquid separator 15 on the one hand, and release the refrigerant migrated into the high-pressure gas-liquid separator 15 and perform pressure relief on the other hand, thereby improving the pressure balance of the system.

[0052] Furthermore, the gas-liquid separation by the high-pressure gas-liquid separator 15 can realize the automatic flow direction of the refrigerant when switching between modes, thereby improving the stability of the system.

[0053] For example, the outdoor heat exchanger 13 is a fin heat exchanger, and the indoor unit 14 is a duct unit, which includes an indoor heat exchanger (such as a fin heat exchanger) and a fan. The fin heat exchanger and the duct unit here are only examples and are not intended to limit the present application. Others may also be possible.

[0054] In some embodiments, Figure 1 As shown, the heat pump system further includes a branch valve 17, which is disposed on the heat recovery branch 16. According to the system operation, the branch valve 17 is opened to return oil or adjust the system pressure balance. For example, the branch valve 17 is a solenoid valve. The solenoid valve here is only an example and is not intended to limit the present application. Other valves are also possible.

[0055] It should be noted that the branch valve 17 is not opened only when the refrigerant is in a gaseous state, but can also be opened when it is not in a gaseous state. That is, the branch valve 17 can be opened according to system conditions, such as refrigerant migration conditions, system pressure conditions, oil return requirements of the compressor 11, and other conditions.

[0056] In some embodiments, Figure 1 As shown, at least part of the heat recovery branch 16 is a capillary tube, that is, Figure 1 As shown in 161, since the capillary resistance is relatively large, it can be used to control the amount of refrigerant entering the low-pressure gas-liquid separator 12, and prevent excessive refrigerant from leaking into the low-pressure gas-liquid separator 12 after the branch valve 17 is opened. And / or, in some other embodiments, at least part of the pipeline of the first refrigerant outlet 152 is a capillary tube, that is, Figure 1 44 shown in . It can be understood that at least part can be part or all.

[0057] In some embodiments, the heat pump system further includes a filtering device, which is disposed on a pipeline of the first refrigerant outlet 152 , and is used to filter impurities, absorb moisture, and prevent clogging.

[0058] In some embodiments, Figure 1 As shown, the high-pressure gas-liquid separator 15 further includes a second refrigerant outlet 153 , the first refrigerant inlet 151 is connected to the second refrigerant outlet 153 , and the second refrigerant outlet 153 is used to output the gaseous refrigerant after gas-liquid separation.

[0059] The heat pump system further includes a heat recovery heat exchanger 18, which is used to achieve heat exchange between the refrigerant and the heat storage medium to store heat. In some embodiments, it is used to achieve heat exchange between the refrigerant and water to produce domestic hot water. In other embodiments, the heat recovery heat exchanger 18 is a heat storage device with a heat storage material. The heat recovery heat exchanger 18 includes a second refrigerant inlet 181 and a third refrigerant outlet 182, and the second refrigerant inlet 181 is connected to the third refrigerant outlet 182.

[0060] The outlet of the compressor 11 is connected to the second refrigerant inlet 181 , the third refrigerant outlet 182 is connected to the first refrigerant inlet 151 , and the second refrigerant outlet 153 is connected to the first refrigerant port 131 and the fourth refrigerant port 142 , respectively.

[0061] When the heat pump system includes the heat recovery heat exchanger 18, the system has multiple operating modes (see below for details), and the high-pressure gas-liquid separator 15 can realize the automatic flow of refrigerant when switching between modes (mainly refrigeration and full heat recovery for domestic hot water mode and refrigeration and waste heat recovery for domestic hot water mode), thereby improving the stability of the system. However, oil accumulation and refrigerant migration problems are prone to occur in the high-pressure gas-liquid separator 15. Therefore, in the trigeneration heat pump system having the heat recovery heat exchanger 18 and the high-pressure gas-liquid separator 15, adding the above-mentioned heat recovery branch 16 is crucial for the oil return and pressure stability of the trigeneration heat pump system.

[0062] For example, the heat recovery heat exchanger 18 is a shell and tube heat exchanger. The shell and tube heat exchanger here is only an example and is not intended to limit the present application. It can also be other types.

[0063] In some embodiments, Figure 1 As shown, the heat recovery heat exchanger 18 further includes a first water inlet 183 and a first water outlet 184, and the first water inlet 183 is connected to the first water outlet 184. The heat pump system further includes a domestic water tank 19, and the domestic water tank 19 includes a cold water inlet 191, a first water outlet 192, a first water return port 193 and a hot water outlet 194, and the first water outlet 192 is connected to the first water inlet 183, and the first water outlet 184 is connected to the first water return port 193.

[0064] In some embodiments, Figure 1As shown, the heat pump system also includes a first water pump 20, which is arranged in the water inlet pipeline (i.e., the pipeline connecting the first water outlet 192 and the first water inlet 183) or the water outlet pipeline (i.e., the pipeline connecting the first water outlet 184 and the first return water port 193) of the heat recovery heat exchanger 18, and the first water pump 20 is used to provide power for the water circulation between the heat recovery heat exchanger 18 and the domestic water tank 19.

[0065] In some embodiments, Figure 1 As shown, the heat recovery heat exchanger 18, the domestic water tank 19 and the first water pump 20 can be integrated into a domestic hot water module, and the user can assemble it according to actual needs.

[0066] In some embodiments, Figure 1 As shown, the heat pump system further includes a first switch valve 21, one outlet of the compressor 11 is connected to the second refrigerant inlet 181 through the first switch valve 21, and the other outlet of the compressor 11 is respectively connected to the first refrigerant port 131 and the fourth refrigerant port 142. When hot water needs to be prepared, the first switch valve 21 can be opened. For example, the first switch valve 21 is a two-way valve, and the two-way valve here is only an example and is not intended to limit the present application, and can also be other.

[0067] In some embodiments, Figure 1 As shown, the heat pump system further includes a first reversing valve 22, and the second refrigerant outlet 153 is respectively connected to the first refrigerant port 131 and the fourth refrigerant port 142 via the first reversing valve 22. In addition, another outlet of the compressor 11 is respectively connected to the first refrigerant port 131 and the fourth refrigerant port 142 via the first reversing valve 22.

[0068] The first reversing valve 22 includes a first valve port 221, a second valve port 222 and a third valve port 223, the first valve port 221 is connected to the second refrigerant outlet 153, the second valve port 222 is respectively connected to the first refrigerant port 131 and the fourth refrigerant port 142, and the third valve port 223 is connected to the outlet of the compressor 11. For example, the first reversing valve 22 is a three-way valve, which is only an example and is not intended to limit the present application, and may be other.

[0069] When in cooling and waste heat recovery domestic hot water mode and heating and domestic hot water mode, the first valve port 221 is connected to the second valve port 222, that is, the second refrigerant outlet 153 is connected to the first refrigerant port 131 or the fourth refrigerant port 142.

[0070] When in cooling mode and heating mode, the third valve port 223 is connected to the second valve port 222, that is, the outlet of the compressor 11 is connected to the first refrigerant port 131 or the fourth refrigerant port 142. It can be understood that when the amount of refrigerant entering the heat recovery heat exchanger 18 needs to be regulated in the cooling and waste heat recovery domestic hot water mode and the heating and domestic hot water mode, the third valve port 223 can also be connected to the second valve port 222.

[0071] In some embodiments, Figure 1 As shown, the heat pump system also includes a second reversing valve 23, the outlet of the compressor 11 is connected to the first refrigerant port 131 and the fourth refrigerant port 142 respectively via the second reversing valve 23, the inlet of the low-pressure gas-liquid separator is connected to the first refrigerant port 131 and the fourth refrigerant port 142 respectively via the second reversing valve 23, and the third refrigerant outlet 182 is connected to the first refrigerant port 131 and the fourth refrigerant port 142 respectively via the second reversing valve 23.

[0072] Specifically, the outlet of the compressor 11 is connected to the first refrigerant port 131 and the fourth refrigerant port 142 via the first reversing valve 22 and the second reversing valve 23, respectively, and the third refrigerant outlet 182 is connected to the first refrigerant port 131 and the fourth refrigerant port 142 via the first refrigerant inlet 151, the second refrigerant outlet 153, the first reversing valve 22 and the second reversing valve 23, respectively.

[0073] The second reversing valve 23 includes a fourth valve port 231, a fifth valve port 232, a sixth valve port 233 and a seventh valve port 234. The fourth valve port 231 is connected to the compressor 11 (specifically, the second valve port 222 of the first reversing valve 22), the fifth valve port 232 is connected to the first refrigerant port 131, the sixth valve port 233 is connected to the inlet of the low-pressure gas-liquid separator 12, and the seventh valve port 234 is connected to the fourth refrigerant port 142. For example, the second reversing valve 23 is a four-way valve, which is only an example and is not intended to limit the present application. It can also be other valves.

[0074] When in cooling and full heat recovery domestic hot water production mode, the seventh valve port 234 is connected to the sixth valve port 233.

[0075] When in the cooling and waste heat recovery domestic hot water production mode and the cooling mode, the fourth valve port 231 is connected to the fifth valve port 232 , and the seventh valve port 234 is connected to the sixth valve port 233 .

[0076] In the heating plus domestic hot water mode and the heating mode, the fourth valve port 231 is connected to the seventh valve port 234 , and the fifth valve port 232 is connected to the sixth valve port 233 .

[0077] In pure hot water mode, the fifth valve port 232 is connected to the sixth valve port 233 .

[0078] In some embodiments, Figure 1 As shown, the heat pump system further includes a first refrigerant flow regulating device 24, and the first refrigerant outlet 152 is respectively connected to the second refrigerant port 132 and the third refrigerant port 141 through the first refrigerant flow regulating device 24. For example, the first refrigerant flow regulating device 24 is an electronic expansion valve or a thermal expansion valve, and the electronic expansion valve and the thermal expansion valve are only examples and are not intended to limit the present application, and may also be other.

[0079] In some embodiments, Figure 1 As shown, the heat pump system further includes a second refrigerant flow regulating device 25 and a heat exchanger 26 , and the heat exchanger 26 includes a fifth refrigerant port 261 , a sixth refrigerant port 262 , a seventh refrigerant port 263 and an eighth refrigerant port 264 .

[0080] The fifth refrigerant port 261 is connected to the sixth refrigerant port 262 to form an enthalpy increase main path. One end of the second refrigerant flow regulating device 25 is connected to the pipeline between the third refrigerant port 141 and the fifth refrigerant port 261, and the other end of the second refrigerant flow regulating device 25 is connected to the eighth refrigerant port 264 via the seventh refrigerant port 263 to form an enthalpy increase auxiliary path. The eighth refrigerant port 264 is connected to the inlet of the low-pressure gas-liquid separator 12.

[0081] The heat pump system of this embodiment is provided with the heat exchanger 26 and the second refrigerant flow regulating device 25 at the outlet of the outdoor heat exchanger 13, so that the refrigerant coming out of the outdoor heat exchanger 13 enters the indoor unit 14 through the enthalpy increase main path (i.e., the sixth refrigerant port 262 and the fifth refrigerant port 261) and enters the indoor unit 14 through the enthalpy increase auxiliary path (i.e., the second refrigerant flow regulating device 25, the seventh refrigerant port 263 and the eighth refrigerant port 264). 64) Entering the inlet of the low-pressure gas-liquid separator 12, after the refrigerant is throttled and cooled by the second refrigerant flow regulating device 25 in the enthalpy increase auxiliary circuit, it can more efficiently absorb the refrigerant heat from the enthalpy increase main circuit in the heat exchanger 26. After absorbing heat, the refrigerant vaporizes and enters the inlet of the low-pressure gas-liquid separator 12. At the same time, the supercooling of the refrigerant after releasing heat in the enthalpy increase main circuit is improved, and the temperature of the refrigerant entering the indoor unit 14 is lower, thereby improving the cooling effect in summer.

[0082] For example, the second refrigerant flow regulating device 25 is an electronic expansion valve or a thermal expansion valve. The electronic expansion valve and the thermal expansion valve here are only examples and are not intended to limit the present application. Others are also possible.

[0083] The heat pump system also includes a second switch valve 27 and a third switch valve 28. The eighth refrigerant port 264 is connected to the inlet of the low-pressure gas-liquid separator 12 via the second switch valve 27, and the eighth refrigerant port 264 is connected to the enthalpy increase port 113 of the compressor 11 via the third switch valve 28.

[0084] For example, the second switch valve 27 and the third switch valve 28 are solenoid valves. The solenoid valves mentioned here are only examples and are not intended to limit the present application. Other valves are also possible.

[0085] The heat pump system of this embodiment arranges the heat exchanger 26 and the second refrigerant flow regulating device 25 at the outlet of the indoor unit 14, so that the refrigerant coming out of the indoor unit 14 enters the outdoor heat exchanger 13 through the enthalpy increase main path (i.e., the fifth refrigerant port 261 and the sixth refrigerant port 262) in one path, and enters the enthalpy increase port 113 of the compressor 11 through the enthalpy increase auxiliary path (i.e., the second refrigerant flow regulating device 25, the seventh refrigerant port 263 and the eighth refrigerant port 264) in the other path. After the refrigerant is throttled and cooled by the second refrigerant flow regulating device 25 in the enthalpy increase auxiliary path, it can more efficiently absorb the refrigerant heat from the enthalpy increase main path in the heat exchanger 26. After absorbing heat, the refrigerant vaporizes and enters the enthalpy increase port 113 of the compressor 11, thereby improving the performance of the compressor 11. At the same time, the supercooling degree of the refrigerant after releasing heat through the enthalpy increase main circuit is improved, and the temperature of the refrigerant entering the outdoor heat exchanger 13 is lower. Especially in cold winter, the temperature of the refrigerant can be made lower than the outdoor temperature, thereby improving the heat absorption performance of the outdoor heat exchanger 13 in a low temperature environment and improving the subsequent heating effect.

[0086] In some embodiments, in the refrigeration and full heat recovery domestic hot water mode, the refrigerant comes out from the outlet of the compressor 11 and passes through the second refrigerant inlet 181, the third refrigerant outlet 182, the first refrigerant inlet 151, the first refrigerant outlet 152 and the enthalpy increase main path and is divided into two paths. One path returns to the inlet of the low-pressure gas-liquid separator 12 through the third refrigerant port 141 and the fourth refrigerant port 142, and the other path returns to the inlet of the low-pressure gas-liquid separator 12 through the enthalpy increase auxiliary path and the second switch valve 27; at the same time, all the heat of the refrigerant is exchanged in the heat recovery heat exchanger 18.

[0087] In the refrigeration and waste heat recovery mode for producing domestic hot water, the refrigerant comes out from the outlet of the compressor 11 and passes through the second refrigerant inlet 181, the third refrigerant outlet 182, the first refrigerant inlet 151, the second refrigerant outlet 153, the first refrigerant port 131, the second refrigerant port 132 and the enthalpy increase main path and is divided into two paths. One path returns to the inlet of the low-pressure gas-liquid separator 12 through the third refrigerant port 141 and the fourth refrigerant port 142, and the other path returns to the inlet of the low-pressure gas-liquid separator 12 through the enthalpy increase auxiliary path and the second switch valve 27; at the same time, part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger 18.

[0088] In the heating plus domestic hot water mode, the refrigerant comes out from the outlet of the compressor 11 and passes through the second refrigerant inlet 181, the third refrigerant outlet 182, the first refrigerant inlet 151, the second refrigerant outlet 153, the fourth refrigerant port 142 and the third refrigerant port 141 and is divided into two paths. One path passes through the enthalpy increase main path, the second refrigerant port 132 and the first refrigerant port 131 and then returns to the inlet of the low-pressure gas-liquid separator 12, and the other path passes through the enthalpy increase auxiliary path and the third switch valve 28 and returns to the enthalpy increase port 113 of the compressor 11; at the same time, part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger 18.

[0089] In the refrigeration mode, the refrigerant comes out from the outlet of the compressor 11 and is divided into two paths after passing through the first refrigerant port 131, the second refrigerant port 132 and the enthalpy increase main path. One path returns to the inlet of the low-pressure gas-liquid separator 12 through the third refrigerant port 141 and the fourth refrigerant port 142, and the other path returns to the inlet of the low-pressure gas-liquid separator 12 through the enthalpy increase auxiliary path and the second switch valve 27.

[0090] In the heating mode, the refrigerant comes out from the outlet of the compressor 11 and is divided into two paths after passing through the fourth refrigerant port 142 and the third refrigerant port 141. One path returns to the inlet of the low-pressure gas-liquid separator 12 after passing through the enthalpy increase main path, the second refrigerant port 132 and the first refrigerant port 131, and the other path returns to the enthalpy increase port 113 of the compressor 11 through the enthalpy increase auxiliary path and the third switch valve 28.

[0091] It should be noted here that all the heat is exchanged in the heat recovery heat exchanger 18, which means that the refrigerant forms all liquid refrigerant after heat exchange in the heat recovery heat exchanger 18, and part of the heat is exchanged in the heat recovery heat exchanger 18, which means that the refrigerant forms gaseous refrigerant after heat exchange in the heat recovery heat exchanger 18.

[0092] In some embodiments, Figure 1 As shown, the heat pump system further includes a third refrigerant flow regulating device 29, and the second refrigerant port 132 is connected to the sixth refrigerant port 262 via the third refrigerant flow regulating device 29. For example, the third refrigerant flow regulating device 29 is an electronic expansion valve or a thermal expansion valve, and the electronic expansion valve and the thermal expansion valve are only examples and are not intended to limit the present application, and may also be other.

[0093] The temperature of the refrigerant entering the outdoor heat exchanger 13 can be further reduced by the third refrigerant flow regulating device 29 .

[0094] Furthermore, the heat pump system further includes a one-way valve 30, the second refrigerant port 132 is connected to the sixth refrigerant port 262 via the third refrigerant flow regulating device 29, and the second refrigerant port 132 is connected to the sixth refrigerant port 262 via the one-way valve 30, and the conducting direction of the one-way valve 30 is toward the sixth refrigerant port 262. It should be noted that the direction of the one-way valve 30 refers to the flow direction of the refrigerant, not the direction of the spatial position.

[0095] In some embodiments, Figure 1 As shown, the heat pump system also includes an oil separator 31 and an oil return pipe 32. The oil separator 31 is arranged at the outlet end of the compressor 11. The oil separator 31 is used to separate the lubricating oil from the compressor 11 mixed in the refrigerant and return it to the compressor 11 through the oil return pipe 32.

[0096] In some embodiments, Figure 1 As shown, the heat pump system further includes a fourth refrigerant flow regulating device 33 corresponding to each of the indoor units 14, and the third refrigerant port 141 is respectively connected to the fifth refrigerant port 261 and one end of the second refrigerant flow regulating device 25 via the fourth refrigerant flow regulating device 33. For example, the fourth refrigerant flow regulating device 33 is an electronic expansion valve or a thermal expansion valve, and the electronic expansion valve and the thermal expansion valve here are only examples and are not intended to limit the present application, and may also be other.

[0097] In this embodiment, the supercooling degree of the refrigerant after releasing heat through the enthalpy increase main circuit is improved, and the temperature of the refrigerant entering the indoor unit 14 is lower, thereby reducing the throttling noise of the fourth refrigerant flow regulating device 33 during summer cooling.

[0098] In some embodiments, Figure 1 As shown, the heat pump system further includes a fresh air module (not shown in the figure), which is provided corresponding to each indoor unit 14 and is used for introducing fresh air from the outside and exhausting dirty air from the room.

[0099] In some embodiments, Figure 1As shown, the heat pump system further includes at least two indoor units 14, an air pipe 34 and a liquid pipe 35. In each of the indoor units 14, the fourth refrigerant port 142 is connected to the corresponding branch interface end in the air pipe 34, and the third refrigerant port 141 is connected to the corresponding branch interface end in the liquid pipe 35. The total interface end of the liquid pipe 35 is respectively connected to the fifth refrigerant port 261 and one end of the second refrigerant flow regulating device 25, and the total interface end of the air pipe 34 (specifically, the total interface end of the air pipe 34 is connected to the outlet of the compressor 11 and the inlet of the low-pressure gas-liquid separator 12 via the second reversing valve 23).

[0100] In some embodiments, Figure 1 As shown, the heat pump system also includes a fourth switch valve 36, a fifth switch valve 37, a sixth switch valve 38 and a seventh switch valve 39. Among them, the fourth switch valve 36 is arranged on the pipeline between the first switch valve 21 and the second refrigerant inlet 181. The fifth switch valve 37 is arranged on the pipeline between the third refrigerant outlet 182 and the first refrigerant inlet 151. One end of the sixth switch valve 38 is connected to the fifth refrigerant port 261 and one end of the second refrigerant flow regulating device 25, and the other end of the sixth switch valve 38 is connected to the total interface end of the liquid pipe 35. The seventh switch valve 39 is arranged on the pipeline between the total interface end of the gas pipe 34 and the second reversing valve 23 (specifically the seventh valve port 234 of the second reversing).

[0101] For example, the fourth switch valve 36, the fifth switch valve 37, the sixth switch valve 38 and the seventh switch valve 39 are stop valves. The stop valves here are only examples and are not intended to limit the present application. Other valves may also be used.

[0102] In some embodiments, Figure 1 As shown, the compressor 11, the low-pressure gas-liquid separator 12, the outdoor heat exchanger 13, the high-pressure gas-liquid separator 15, the first switch valve 21, the first reversing valve 22, the second reversing valve 23, the first refrigerant flow regulating device 24, the second refrigerant flow regulating device 25, the heat exchanger 26, the second switch valve 27, the third switch valve 28, the third refrigerant flow regulating device 29, the oil separator 31, the return oil pipe 32, the fourth switch valve 36, the fifth switch valve 37, the sixth switch valve 38 and the seventh switch valve 39 are all integrated in the outdoor main unit. It can be understood that at least one of the fourth switch valve 36, the fifth switch valve 37, the sixth switch valve 38 and the seventh switch valve 39 can be located inside or on the outer surface of the outdoor main unit.

[0103] In some embodiments, Figure 1 As shown, the heat pump system further includes at least one heat exchanger 40, which is used to realize heat exchange between the refrigerant and the water in the terminal 42, and the heat exchanger 40 includes a ninth refrigerant port 401 and a tenth refrigerant port 402, and the ninth refrigerant port 401 is connected to the tenth refrigerant port 402. The ninth refrigerant port 401 is connected to the corresponding branch interface end in the gas pipe 34, and the tenth refrigerant port 402 is connected to the corresponding branch interface end in the liquid pipe 35. It can be understood that at least one can be one, two, three or any number.

[0104] In some embodiments, Figure 1 As shown, the heat pump system further includes a fifth refrigerant flow regulating device 41, and the fifth refrigerant flow regulating device 41 is used to throttle and cool the refrigerant. The tenth refrigerant port 402 is connected to the corresponding branch interface end in the liquid pipe 35 through the fifth refrigerant flow regulating device 41. For example, the fifth refrigerant flow regulating device 41 is an electronic expansion valve or a thermal expansion valve. The electronic expansion valve and the thermal expansion valve here are only examples and are not intended to limit the present application. Others may also be used.

[0105] In some embodiments, Figure 1 As shown, the heat exchanger 40 also includes a second water inlet 403 and a second water outlet 404, and the second water inlet 403 is connected to the second water outlet 404. The heat pump system also includes the terminal 42, and the terminal 42 includes a second water outlet 421 and a second water return port 422, the second water outlet 421 is connected to the second water inlet 403, and the second water outlet 404 is connected to the second water return port 422. For example, the terminal 42 is a ground pipe, which realizes floor heating or floor cooling effects through heat exchange with the heat exchanger 40. If the ground pipe is multi-channel, a manifold can also be set at the terminal. The ground pipe here is only an example and is not intended to limit the present application. It can also be other.

[0106] In some embodiments, Figure 1 As shown, the heat pump system also includes a second water pump 43, which is arranged in the water inlet pipeline of the terminal 42 (i.e., the pipeline connecting the second water outlet 421 and the second water inlet 403) or the water outlet pipeline (i.e., the pipeline connecting the second water outlet 404 and the second water return port 422), and the second water pump 43 is used to provide power for the water circulation between the heat exchanger 40 and the terminal 42.

[0107] In some embodiments, Figure 1As shown, the heat exchanger 40, the fifth refrigerant flow regulating device 41 and the second water pump 43 can be integrated into a hydraulic module, and the user can assemble it on the gas pipe 34 and the liquid pipe 35 according to the needs. In addition, the indoor unit 14 and the hydraulic module can be operated selectively or simultaneously.

[0108] In some embodiments, Figure 1 As shown, the connection relationship between the components in the heat pump system is as follows:

[0109] The outlet of the compressor 11 is connected to the second refrigerant inlet 181 through the first switch valve 21 and the fourth switch valve 36, and the outlet of the compressor 11 is connected to the third valve port 223 of the first reversing valve 22. The third refrigerant outlet 182 is connected to the first refrigerant inlet 151 of the high-pressure gas-liquid separator 15 through the fifth switch valve 37. The second refrigerant outlet 153 of the high-pressure gas-liquid separator 15 is connected to the first valve port 221 of the first reversing valve 22. The first refrigerant outlet 152 of the high-pressure gas-liquid separator 15 is connected to the sixth refrigerant port 262 of the heat exchanger 26 through the first refrigerant flow regulating device 24, and the first refrigerant outlet 152 of the high-pressure gas-liquid separator 15 is connected to the inlet of the low-pressure gas-liquid separator 12 through the heat recovery branch 16. The second valve port 222 of the first reversing valve 22 is connected to the fourth valve port 231 of the second reversing valve 23. The fifth valve port 232 of the second reversing valve 23 is connected to the first refrigerant port 131 of the outdoor heat exchanger 13. The sixth valve port 233 of the second reversing valve 23 is connected via the inlet of the low-pressure gas-liquid separator 12, and the outlet of the low-pressure gas-liquid separator 12 is connected to the inlet of the compressor 11. The seventh valve port 234 of the second reversing valve 23 is connected to the main interface end of the gas pipe 34 via the seventh switch valve 39. The main interface end of the liquid pipe 35 is connected to the fifth refrigerant port 261 of the heat exchanger 26 through the sixth switch valve 38, and the main interface end of the liquid pipe 35 is connected to the seventh refrigerant port 263 of the heat exchanger 26 through the second refrigerant flow regulating device 25 after passing through the sixth switch valve 38. The sixth refrigerant port 262 of the heat exchanger 26 is connected to the second refrigerant port 132 of the outdoor heat exchanger 13 through the third refrigerant flow regulating device 29, and is connected to the second refrigerant port 132 of the outdoor heat exchanger 13 through the one-way valve 30. The conducting direction of the one-way valve 30 is toward the sixth refrigerant port 262 of the heat exchanger 26. The eighth refrigerant port 264 of the heat exchanger 26 is connected to the inlet of the low-pressure gas-liquid separator 12 through the second switch valve 27, and is connected to the enthalpy increase port 113 of the compressor 11 through the third switch valve 28.

[0110] The first water outlet 192 of the domestic water tank 19 is connected to the first water inlet 183 of the heat recovery heat exchanger 18 via the first water pump 20 , and the first water outlet 184 of the heat recovery heat exchanger 18 is connected to the first water return port 193 of the domestic water tank 19 .

[0111] The fourth refrigerant port 142 of the indoor unit 14 is connected to the corresponding branch interface end of the gas pipe 34 , and the third refrigerant port 141 of the indoor unit 14 is connected to the corresponding branch interface end of the liquid pipe 35 via the fourth refrigerant flow regulating device 33 .

[0112] The ninth refrigerant port 401 of the heat exchanger 40 is connected to the corresponding branch port end of the gas pipe 34, and the tenth refrigerant port 402 of the heat exchanger 40 is connected to the corresponding branch port end of the liquid pipe 35 via the fifth refrigerant flow regulating device 41. The second water outlet 421 of the terminal 42 is connected to the second water inlet 403 of the heat exchanger 40 via the second water pump 43, and the second water outlet 404 of the heat exchanger 40 is connected to the second water return port 422 of the terminal 42.

[0113] In different situations, the heat pump system will correspond to different valve ports. Figure 1 The heat pump system shown in the figure shows the refrigerant flow direction of each mode. It should be noted that the components not indicated as turned on are closed, as follows:

[0114] like Figure 2As shown, in the cooling and full heat recovery domestic hot water mode, the first refrigerant flow regulating device 24, the fourth refrigerant flow regulating device 33, the fifth refrigerant flow regulating device 41, the first switch valve 21, the second switch valve 27, the fourth switch valve 36, the fifth switch valve 37, the sixth switch valve 38 and the seventh switch valve 39 are opened, the first valve port 221 of the first reversing valve 22 is connected or not connected with the second valve port 222, and the seventh valve port 234 of the second reversing valve 23 is connected with the sixth valve port 233. 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 second refrigerant inlet 181 of the heat recovery heat exchanger 18 after passing through the first switch valve 21 and the fourth switch valve 36. The high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 19 in the heat recovery heat exchanger 18, and becomes a medium-temperature liquid refrigerant after preparing hot water. The medium-temperature liquid refrigerant output from the third refrigerant outlet 182 of the heat recovery heat exchanger 18 enters the first refrigerant inlet 151 of the high-pressure gas-liquid separator 15 through the fifth switch valve 37, and further gas-liquid separation is performed in the high-pressure gas-liquid separator 15 to ensure that the refrigerant output from the first refrigerant outlet 152 is pure liquid. The medium-temperature liquid refrigerant output from the first refrigerant outlet 152 is throttled and cooled by the first refrigerant flow regulating device 24 to become a low-temperature liquid refrigerant with a lower temperature, and then enters the enthalpy increase main path (i.e., the sixth refrigerant port 262 and the fifth refrigerant port 261). The low-temperature liquid refrigerant output from the enthalpy increase main path enters the liquid pipe 35 through the sixth switch valve 38, and the low-temperature liquid refrigerant output from the enthalpy increase main path of the heat exchanger 26 enters the enthalpy increase auxiliary path (i.e., the The second refrigerant flow regulating device 25, the seventh refrigerant port 263 and the sixth refrigerant port 262), after the low-temperature liquid refrigerant is throttled and cooled by the second refrigerant flow regulating device 25 in the enthalpy increase auxiliary circuit, it can more efficiently absorb the refrigerant heat from the enthalpy increase main circuit in the heat exchanger 26 and become a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the enthalpy increase auxiliary circuit returns to the inlet of the compressor 11 after passing through the second switch valve 27 and the low-pressure gas-liquid separator 12. The low-temperature liquid refrigerant in the enthalpy increase main path is reduced in temperature by heat exchange and becomes a low-temperature liquid refrigerant with a lower temperature. The low-temperature liquid refrigerant enters the fourth refrigerant flow regulating device 33 in the liquid pipe 35, and becomes a low-temperature liquid refrigerant with a lower temperature after throttling and cooling by the fourth refrigerant flow regulating device 33, and then enters the third refrigerant port 141 of the indoor unit 14. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 14, and the low-temperature liquid refrigerant absorbs heat from the indoor air and evaporates to become a low-temperature gaseous refrigerant. The indoor unit 14 blows out cold air, and the low-temperature gaseous refrigerant output by the fourth refrigerant port 142 of the indoor unit 14 enters the air pipe 34.Furthermore, the low-temperature liquid refrigerant enters the fifth refrigerant flow regulating device 41 in the liquid pipe 35, becomes a low-temperature liquid refrigerant with a lower temperature after being throttled and cooled by the fifth refrigerant flow regulating device 41, and then enters the tenth refrigerant port 402 of the heat exchanger 40, and the low-temperature liquid refrigerant exchanges heat with the water at the end 42 in the heat exchanger 40, and the low-temperature liquid refrigerant absorbs the heat of the water and evaporates to become a low-temperature gaseous refrigerant, and the water in the end 42 becomes cold water, and the low-temperature gaseous refrigerant output from the ninth refrigerant port 401 of the heat exchanger 40 enters the air pipe 34. The low-temperature gaseous refrigerant output from the air pipe 34 passes through the seventh switch valve 39, the seventh valve port 234 and the sixth valve port 233 of the second reversing valve 23, and the low-pressure gas-liquid separator 12, and then returns to the inlet of the compressor 11, and circulates back and forth.

[0115] The heat recovery heat exchanger 18 is connected to the domestic water tank 19, so that all the condensation heat originally used for heat exchange with the air by the outdoor heat exchanger 13 can be recovered and utilized during cooling, avoiding heat waste in the outdoor heat exchanger 13 and air heat exchange. The recovered heat is exchanged with the water in the domestic water tank 19 in the heat recovery heat exchanger 18 to quickly prepare hot water, improve energy utilization, and increase the speed of hot water production. In addition, by configuring the heat exchanger 40 and the terminal 42, the effects of floor cooling and the like can be achieved while cooling, thereby improving energy utilization.

[0116] like Figure 3As shown, when the domestic hot water reaches a certain temperature, it can be switched to the refrigeration and waste heat recovery domestic hot water mode. In the refrigeration and waste heat recovery domestic hot water mode, the fourth refrigerant flow regulating device 33, the fifth refrigerant flow regulating device 41, the first switch valve 21, the second switch valve 27, the fourth switch valve 36, the fifth switch valve 37, the sixth switch valve 38 and the seventh switch valve 39 are opened, the first valve port 221 of the first reversing valve 22 is connected to the second valve port 222, the fourth valve port 231 of the second reversing valve 23 is connected to the fifth valve port 232, and the seventh valve port 234 of the second reversing valve 23 is connected to the sixth valve port 233. 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 second refrigerant inlet 181 of the heat recovery heat exchanger 18 after passing through the first switch valve 21 and the fourth switch valve 36. The high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 19 in the heat recovery heat exchanger 18, and becomes a medium-temperature gaseous refrigerant after preparing hot water. The medium-temperature gaseous refrigerant output from the third refrigerant outlet 182 of the heat recovery heat exchanger 18 enters the first refrigerant inlet 151 of the high-pressure gas-liquid separator 15 through the fifth switch valve 37, and further gas-liquid separation is performed in the high-pressure gas-liquid separator 15 to ensure that the refrigerant output from the second refrigerant outlet 153 is pure gas. The medium-temperature gaseous refrigerant output from the second refrigerant outlet 153 enters the first refrigerant port 131 of the outdoor heat exchanger 13 after passing through the first valve port 221 and the second valve port 222 of the first reversing valve 22 and the fourth valve port 231 and the fifth valve port 232 of the second reversing valve 23. The medium-temperature gaseous refrigerant condenses and releases heat in the outdoor heat exchanger 13 and becomes a medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the second refrigerant port 132 of the outdoor heat exchanger 13 enters the enthalpy increase main path (i.e., the sixth refrigerant port 262 and the fifth refrigerant port 261) through the one-way valve 30. The medium-temperature liquid refrigerant output from the enthalpy increase main path enters the liquid pipe 35 through the sixth switch valve 38 in one way, and the medium-temperature liquid refrigerant output from the enthalpy increase main path of the heat exchanger 26 enters the enthalpy increase auxiliary path (i.e., the second refrigerant flow regulating device 26 in another way). 25, the seventh refrigerant port 263 and the sixth refrigerant port 262), after the medium-temperature liquid refrigerant is throttled and cooled by the second refrigerant flow regulating device 25 in the enthalpy increase auxiliary circuit, it can more efficiently absorb the refrigerant heat from the enthalpy increase main circuit in the heat exchanger 26 and become a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the enthalpy increase auxiliary circuit returns to the inlet of the compressor 11 after passing through the second switch valve 27 and the low-pressure gas-liquid separator 12.The medium-temperature liquid refrigerant in the enthalpy increase main path is reduced in temperature by heat exchange and becomes a low-temperature liquid refrigerant with a lower temperature. The low-temperature liquid refrigerant output by the enthalpy increase main path enters the liquid pipe 35 through the sixth switch valve 38 in one way, and the low-temperature liquid refrigerant output by the enthalpy increase main path of the heat exchanger 26 enters the enthalpy increase auxiliary path in another way. The medium-temperature liquid refrigerant or the low-temperature liquid refrigerant enters the fourth refrigerant flow regulating device 33 in the liquid pipe 35, and becomes a low-temperature liquid refrigerant with a lower temperature after throttling and cooling by the fourth refrigerant flow regulating device 33, and then enters the third refrigerant port 141 of the indoor unit 14. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 14, and the low-temperature liquid refrigerant absorbs heat from the indoor air and evaporates to become a low-temperature gaseous refrigerant. The indoor unit 14 blows out cold air, and the low-temperature gaseous refrigerant output by the fourth refrigerant port 142 of the indoor unit 14 enters the air pipe 34. Furthermore, the medium-temperature liquid refrigerant or the low-temperature liquid refrigerant enters the fifth refrigerant flow regulating device 41 in the liquid pipe 35, and becomes a low-temperature liquid refrigerant with a lower temperature after throttling and cooling by the fifth refrigerant flow regulating device 41, and then enters the tenth refrigerant port 402 of the heat exchanger 40, and the low-temperature liquid refrigerant exchanges heat with the water at the terminal 42 in the heat exchanger 40, and the low-temperature liquid refrigerant absorbs the heat of the water and evaporates to become a low-temperature gaseous refrigerant, and the water in the terminal 42 becomes cold water, and the low-temperature gaseous refrigerant output from the ninth refrigerant port 401 of the heat exchanger 40 enters the air pipe 34. The low-temperature gaseous refrigerant output from the air pipe 34 passes through the seventh switch valve 39, the seventh valve port 234 and the sixth valve port 233 of the second reversing valve 23, and the low-pressure gas-liquid separator 12, and then returns to the inlet of the compressor 11, and circulates back and forth.

[0117] The heat recovery heat exchanger 18 is connected to the domestic water tank 19, so that at least part of the condensation heat originally used for heat exchange with the air by the outdoor heat exchanger 13 can be recovered and utilized during cooling, avoiding heat waste in the outdoor heat exchanger 13 and air heat exchange. The recovered heat is exchanged with the water in the domestic water tank 19 in the heat recovery heat exchanger 18 to quickly prepare hot water, improve energy utilization, and increase the speed of hot water production. In addition, by configuring the heat exchanger 40 and the terminal 42, the effects of floor cooling and the like can be achieved while cooling, thereby improving energy utilization.

[0118] Specifically, Figure 3 and Figure 2 The difference between the shown embodiments is that Figure 3 In order to recycle at least part of the condensation heat originally used for heat exchange with air by the outdoor heat exchanger 13, Figure 2 This is to recover and utilize all the condensation heat originally used by the outdoor heat exchanger 13 for heat exchange with the air.

[0119] like Figure 4As shown, in the refrigeration and waste heat recovery domestic hot water mode, the fourth refrigerant flow regulating device 33, the fifth refrigerant flow regulating device 41, the first switch valve 21, the second switch valve 27, the fourth switch valve 36, the fifth switch valve 37, the sixth switch valve 38 and the seventh switch valve 39 are opened, the second valve port 222 of the first reversing valve 22 is connected with the first valve port 221 and the third valve port 223, the fourth valve port 231 of the second reversing valve 23 is connected with the fifth valve port 232, and the seventh valve port 234 of the second reversing valve 23 is connected with the sixth valve port 233. That is, when hot water needs to be prepared in the cooling mode, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 passes through the first switch valve 21 and the fourth switch valve 36 and then enters the second refrigerant inlet 181 of the heat recovery heat exchanger 18, and the high-temperature gaseous refrigerant output from the outlet of the compressor 11 passes through the third valve port 223 and the second valve port 222 of the first reversing valve 22 and the fourth valve port 231 and the fifth valve port 232 of the second reversing valve 23 and then enters the first refrigerant port 131 of the outdoor heat exchanger 13. The high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 19 in the heat recovery heat exchanger 18, and becomes a medium-temperature gaseous refrigerant after preparing hot water. The medium-temperature gaseous refrigerant outputted from the third refrigerant outlet 182 of the heat recovery heat exchanger 18 enters the first refrigerant inlet 151 of the high-pressure gas-liquid separator 15 through the fifth switch valve 37, and further gas-liquid separation is performed in the high-pressure gas-liquid separator 15 to ensure that the refrigerant outputted from the second refrigerant outlet 153 is pure gaseous. The medium-temperature gaseous refrigerant outputted from the second refrigerant outlet 153 enters the first refrigerant port 131 of the outdoor heat exchanger 13 after passing through the first valve port 221 and the second valve port 222 of the first reversing valve 22 and the fourth valve port 231 and the fifth valve port 232 of the second reversing valve 23, and the medium-temperature gaseous refrigerant condenses and releases heat in the outdoor heat exchanger 13 to become a medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the second refrigerant port 132 of the outdoor heat exchanger 13 enters the enthalpy increase main path (i.e., the sixth refrigerant port 262 and the fifth refrigerant port 261) through the one-way valve 30, and the medium-temperature liquid refrigerant output from the enthalpy increase main path enters the liquid pipe 35 through the sixth switch valve 38, and the medium-temperature liquid refrigerant output from the enthalpy increase main path of the heat exchanger 26 enters the enthalpy increase auxiliary path (i.e., the second refrigerant flow regulating device 26) through the other path. 25, the seventh refrigerant port 263 and the sixth refrigerant port 262), after the medium-temperature liquid refrigerant is throttled and cooled by the second refrigerant flow regulating device 25 in the enthalpy increase auxiliary circuit, it can more efficiently absorb the refrigerant heat from the enthalpy increase main circuit in the heat exchanger 26 and become a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the enthalpy increase auxiliary circuit returns to the inlet of the compressor 11 after passing through the second switch valve 27 and the low-pressure gas-liquid separator 12.The medium-temperature liquid refrigerant in the enthalpy increase main path is reduced in temperature by heat exchange and becomes a low-temperature liquid refrigerant with a lower temperature. The low-temperature liquid refrigerant output by the enthalpy increase main path enters the liquid pipe 35 through the sixth switch valve 38 in one way, and the low-temperature liquid refrigerant output by the enthalpy increase main path of the heat exchanger 26 enters the enthalpy increase auxiliary path in another way. The medium-temperature liquid refrigerant or the low-temperature liquid refrigerant enters the fourth refrigerant flow regulating device 33 in the liquid pipe 35, and becomes a low-temperature liquid refrigerant with a lower temperature after throttling and cooling by the fourth refrigerant flow regulating device 33, and then enters the third refrigerant port 141 of the indoor unit 14. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 14, and the low-temperature liquid refrigerant absorbs heat from the indoor air and evaporates to become a low-temperature gaseous refrigerant. The indoor unit 14 blows out cold air, and the low-temperature gaseous refrigerant output by the fourth refrigerant port 142 of the indoor unit 14 enters the air pipe 34. Furthermore, the medium-temperature liquid refrigerant or the low-temperature liquid refrigerant enters the fifth refrigerant flow regulating device 41 in the liquid pipe 35, and becomes a low-temperature liquid refrigerant with a lower temperature after throttling and cooling by the fifth refrigerant flow regulating device 41, and then enters the tenth refrigerant port 402 of the heat exchanger 40, and the low-temperature liquid refrigerant exchanges heat with the water at the terminal 42 in the heat exchanger 40, and the low-temperature liquid refrigerant absorbs the heat of the water and evaporates to become a low-temperature gaseous refrigerant, and the water in the terminal 42 becomes cold water, and the low-temperature gaseous refrigerant output from the ninth refrigerant port 401 of the heat exchanger 40 enters the air pipe 34. The low-temperature gaseous refrigerant output from the air pipe 34 passes through the seventh switch valve 39, the seventh valve port 234 and the sixth valve port 233 of the second reversing valve 23, and the low-pressure gas-liquid separator 12, and then returns to the inlet of the compressor 11, and circulates back and forth.

[0120] Specifically, Figure 4 and Figure 3 The difference between the shown embodiments is that Figure 4 In the embodiment shown, an additional refrigerant path enters the outdoor heat exchanger 13 after passing through the third valve port 223 and the second valve port 222 of the first reversing valve 22 and the fourth valve port 231 and the fifth valve port 232 of the second reversing valve 23, so that the amount of refrigerant entering the heat recovery heat exchanger 18 can be better regulated, and the refrigerant coming out of the compressor 11 directly reaching the second reversing valve 23 can be more guaranteed to be a pure gaseous refrigerant. The pure gaseous refrigerant can better ensure that the second reversing valve 23 has sufficient pressure difference for reversing, thereby reducing the pressure loss of the refrigerant pipeline.

[0121] like Figure 5As shown, in the heating plus domestic hot water mode, the second refrigerant flow regulating device 25, the fourth refrigerant flow regulating device 33, the third refrigerant flow regulating device 29, the fifth refrigerant flow regulating device 41, the first switch valve 21, the third switch valve 28, the fourth switch valve 36, the fifth switch valve 37, the sixth switch valve 38 and the seventh switch valve 39 are opened, the first valve port 221 of the first reversing valve 22 is connected to the second valve port 222, the fourth valve port 231 of the second reversing valve 23 is connected to the seventh valve port 234, and the fifth valve port 232 of the second reversing valve 23 is connected to the sixth valve port 233. 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 second refrigerant inlet 181 of the heat recovery heat exchanger 18 after passing through the first switch valve 21 and the fourth switch valve 36. The high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 19 in the heat recovery heat exchanger 18, and becomes a medium-temperature gaseous refrigerant after preparing hot water. The medium-temperature gaseous refrigerant output from the third refrigerant outlet 182 of the heat recovery heat exchanger 18 enters the first refrigerant inlet 151 of the high-pressure gas-liquid separator 15 through the fifth switch valve 37, and further gas-liquid separation is performed in the high-pressure gas-liquid separator 15 to ensure that the refrigerant output from the second refrigerant outlet 153 is pure gas. The medium-temperature gaseous refrigerant output by the second refrigerant outlet 153 enters the air pipe 34 through the first valve port 221 and the second valve port 222 of the first reversing valve 22, the fourth valve port 231 and the seventh valve port 234 of the second reversing valve 23 and the seventh switch valve 39, and the medium-temperature gaseous refrigerant enters the fourth refrigerant port 142 of the indoor unit 14 in the air pipe 34. The medium-temperature gaseous refrigerant exchanges heat with the indoor air in the indoor unit 14, and the medium-temperature gaseous refrigerant releases heat to the indoor air and condenses into a medium-temperature liquid refrigerant. The indoor unit 14 blows out hot air, and the medium-temperature liquid refrigerant output by the third refrigerant port 141 of the indoor unit 14 becomes a low-temperature liquid refrigerant after throttling and cooling by the fourth refrigerant flow regulating device 33, and then the low-temperature liquid refrigerant output by the fourth refrigerant flow regulating device 33 enters the liquid pipe 35. In addition, the medium-temperature gaseous refrigerant enters the ninth refrigerant port 401 of the heat exchanger 40 in the gas pipe 34, and becomes a medium-temperature liquid refrigerant after heat exchange with the water in the terminal 42 in the heat exchanger 40, and the water in the terminal 42 becomes hot water. The medium-temperature liquid refrigerant output from the tenth refrigerant port 402 of the heat exchanger 40 is throttled and cooled by the fifth refrigerant flow regulating device 41 and becomes a low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output by the fifth refrigerant flow regulating device 41 enters the liquid pipe 35.The low-temperature liquid refrigerant output by the liquid pipe 35 enters the enthalpy increase main circuit (i.e., the fifth refrigerant port 261 and the sixth refrigerant port 262) through the sixth switch valve 38, and the low-temperature liquid refrigerant output by the liquid pipe 35 enters the enthalpy increase auxiliary circuit (i.e., the second refrigerant flow regulating device 25, the seventh refrigerant port 263 and the sixth refrigerant port 262) through the sixth switch valve 38. After the low-temperature liquid refrigerant is throttled and cooled by the second refrigerant flow regulating device 25 in the enthalpy increase auxiliary circuit, it can more efficiently absorb the refrigerant heat from the enthalpy increase main circuit in the heat exchanger 26 and become a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output by the enthalpy increase auxiliary circuit returns to the enthalpy increase port 113 of the compressor 11 through the third switch valve 28. The low-temperature liquid refrigerant in the enthalpy-increasing main path is reduced in temperature by heat exchange and becomes a low-temperature liquid refrigerant with a lower temperature. It then enters the third refrigerant flow regulating device 29 for throttling and cooling. After becoming a low-temperature liquid refrigerant with a still lower temperature, it enters the second refrigerant port 132 of the outdoor heat exchanger 13. The low-temperature liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 13 and becomes a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output by the first refrigerant port 131 of the outdoor heat exchanger 13 passes through the fifth valve port 232 and the sixth valve port 233 of the second reversing valve 23 and the low-pressure gas-liquid separator 12 and then returns to the inlet of the compressor 11, and circulates back and forth. The heat pump system can also prepare hot water and achieve floor heating and other effects while heating, thereby improving energy utilization.

[0122] like Figure 6As shown, in the heating plus domestic hot water mode, the second refrigerant flow regulating device 25, the fourth refrigerant flow regulating device 33, the third refrigerant flow regulating device 29, the fifth refrigerant flow regulating device 41, the first switch valve 21, the third switch valve 28, the fourth switch valve 36, the fifth switch valve 37, the sixth switch valve 38 and the seventh switch valve 39 are opened, the second valve port 222 of the first reversing valve 22 is connected with the first valve port 221 and the third valve port 223, the fourth valve port 231 of the second reversing valve 23 is connected with the seventh valve port 234, and the fifth valve port 232 of the second reversing valve 23 is connected with the sixth valve port 233. 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 second refrigerant inlet 181 of the heat recovery heat exchanger 18 after passing through the first switch valve 21 and the fourth switch valve 36, and the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the air pipe 34 through the third valve port 223 and the second valve port 222 of the first reversing valve 22, the fourth valve port 231 and the seventh valve port 234 of the second reversing valve 23 and the seventh switch valve 39. The high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 19 in the heat recovery heat exchanger 18, and becomes a medium-temperature gaseous refrigerant after preparing hot water. The medium-temperature gaseous refrigerant output from the third refrigerant outlet 182 of the heat recovery heat exchanger 18 enters the first refrigerant inlet 151 of the high-pressure gas-liquid separator 15 through the fifth switch valve 37, and further gas-liquid separation is performed in the high-pressure gas-liquid separator 15 to ensure that the refrigerant output from the second refrigerant outlet 153 is pure gas. The medium-temperature gaseous refrigerant output by the second refrigerant outlet 153 enters the air pipe 34 through the first valve port 221 and the second valve port 222 of the first reversing valve 22, the fourth valve port 231 and the seventh valve port 234 of the second reversing valve 23 and the seventh switch valve 39, and the medium-temperature gaseous refrigerant enters the fourth refrigerant port 142 of the indoor unit 14 in the air pipe 34. The medium-temperature gaseous refrigerant exchanges heat with the indoor air in the indoor unit 14, and the medium-temperature gaseous refrigerant releases heat to the indoor air and condenses into a medium-temperature liquid refrigerant. The indoor unit 14 blows out hot air, and the medium-temperature liquid refrigerant output by the third refrigerant port 141 of the indoor unit 14 becomes a low-temperature liquid refrigerant after throttling and cooling by the fourth refrigerant flow regulating device 33, and then the low-temperature liquid refrigerant output by the fourth refrigerant flow regulating device 33 enters the liquid pipe 35.In addition, the medium-temperature gaseous refrigerant enters the ninth refrigerant port 401 of the heat exchanger 40 in the gas pipe 34, and becomes a medium-temperature liquid refrigerant after heat exchange with the water in the terminal 42 in the heat exchanger 40, and the water in the terminal 42 becomes hot water. The medium-temperature liquid refrigerant output from the tenth refrigerant port 402 of the heat exchanger 40 is throttled and cooled by the fifth refrigerant flow regulating device 41 and becomes a low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output by the fifth refrigerant flow regulating device 41 enters the liquid pipe 35. The low-temperature liquid refrigerant output by the liquid pipe 35 enters the enthalpy increase main circuit (i.e., the fifth refrigerant port 261 and the sixth refrigerant port 262) through the sixth switch valve 38, and the low-temperature liquid refrigerant output by the liquid pipe 35 enters the enthalpy increase auxiliary circuit (i.e., the second refrigerant flow regulating device 25, the seventh refrigerant port 263 and the sixth refrigerant port 262) through the sixth switch valve 38. After the low-temperature liquid refrigerant is throttled and cooled by the second refrigerant flow regulating device 25 in the enthalpy increase auxiliary circuit, it can more efficiently absorb the refrigerant heat from the enthalpy increase main circuit in the heat exchanger 26 and become a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output by the enthalpy increase auxiliary circuit returns to the enthalpy increase port 113 of the compressor 11 through the third switch valve 28. The low-temperature liquid refrigerant in the enthalpy-increasing main circuit becomes a low-temperature liquid refrigerant with a lower temperature after its temperature is reduced by heat exchange, and then enters the third refrigerant flow regulating device 29 for throttling and cooling. After becoming a low-temperature liquid refrigerant with an even lower temperature, it enters the second refrigerant port 132 of the outdoor heat exchanger 13. The low-temperature liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 13 and becomes a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the first refrigerant port 131 of the outdoor heat exchanger 13 passes through the fifth valve port 232 and the sixth valve port 233 of the second reversing valve 23 and the low-pressure gas-liquid separator 12 and then returns to the inlet of the compressor 11, repeating the cycle.

[0123] Specifically, Figure 6 and Figure 5 The difference between the shown embodiments is that Figure 6 In the embodiment shown, an additional path is provided through which the third valve port 223 and the second valve port 222 of the first reversing valve 22, the fourth valve port 231 and the seventh valve port 234 of the second reversing valve 23, and the sixth switch valve 38 enter the air pipe 34, so that the amount of refrigerant entering the heat recovery heat exchanger 18 can be better regulated, and the path from the compressed refrigerant directly reaching the second reversing valve 23 can be guaranteed to be a gaseous refrigerant. The pure gaseous refrigerant can better ensure that the second reversing valve 23 has sufficient pressure difference for reversing, thereby reducing the pressure loss on the refrigerant pipeline.

[0124] like Figure 7As shown, in the pure hot water mode, the first refrigerant flow regulating device 24, the third refrigerant flow regulating device 29, the first switch valve 21, the fourth switch valve 36 and the fifth switch valve 37 are opened, the first valve port 221 of the first reversing valve 22 is connected or not connected with the second valve port 222, and the fifth valve port 232 of the second reversing valve 23 is connected with the sixth valve port 233. That is, when only hot water needs to be prepared, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the second refrigerant inlet 181 of the heat recovery heat exchanger 18 after passing through the first switch valve 21 and the fourth switch valve 36. The high-temperature gaseous refrigerant exchanges heat with the water in the domestic water tank 19 in the heat recovery heat exchanger 18, and becomes a medium-temperature liquid refrigerant after preparing hot water. The medium-temperature liquid refrigerant output from the third refrigerant outlet 182 of the heat recovery heat exchanger 18 enters the first refrigerant inlet 151 of the high-pressure gas-liquid separator 15 through the fifth switch valve 37, and further gas-liquid separation is performed in the high-pressure gas-liquid separator 15 to ensure that the refrigerant output from the first refrigerant outlet 152 is pure liquid. The medium-temperature liquid refrigerant output from the first refrigerant outlet 152 is throttled and cooled by the first refrigerant flow regulating device 24 to become a low-temperature liquid refrigerant with a lower temperature, and then enters the third refrigerant flow regulating device 29 for throttling and cooling. After becoming a low-temperature liquid refrigerant with an even lower temperature, it enters the second refrigerant port 132 of the outdoor heat exchanger 13. The low-temperature liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 13 to become a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the first refrigerant port 131 of the outdoor heat exchanger 13 passes through the fifth valve port 232 and the sixth valve port 233 of the second reversing valve 23 and the low-pressure gas-liquid separator 12 and then returns to the inlet of the compressor 11, repeating the cycle.

[0125] like Figure 8As shown, in the cooling mode, the second refrigerant flow regulating device 25, the fourth refrigerant flow regulating device 33, the fifth refrigerant flow regulating device 41, the second switch valve 27, the sixth switch valve 38 and the seventh switch valve 39 are opened, the third valve port 223 of the first reversing valve 22 is connected to the second valve port 222, the fourth valve port 231 of the second reversing valve 23 is connected to the fifth valve port 232, and the seventh valve port 234 of the second reversing valve 23 is connected to the sixth valve port 233. That is, when cooling in summer, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the first refrigerant port 131 of the outdoor heat exchanger 13 after passing through the third valve port 223 and the second valve port 222 of the first reversing valve 22 and the fourth valve port 231 and the fifth valve port 232 of the second reversing valve 23, and the medium-temperature gaseous refrigerant condenses and releases heat in the outdoor heat exchanger 13 to become a medium-temperature liquid refrigerant. The medium-temperature liquid refrigerant output from the second refrigerant port 132 of the outdoor heat exchanger 13 enters the enthalpy increase main path (i.e., the sixth refrigerant port 262 and the fifth refrigerant port 261) through the one-way valve 30, and the medium-temperature liquid refrigerant output from the enthalpy increase main path enters the liquid pipe 35 through the sixth switch valve 38, and the medium-temperature liquid refrigerant output from the enthalpy increase main path of the heat exchanger 26 enters the enthalpy increase auxiliary path (i.e., the second refrigerant flow regulating device 26) through the other path. 25, the seventh refrigerant port 263 and the sixth refrigerant port 262), after the medium-temperature liquid refrigerant is throttled and cooled by the second refrigerant flow regulating device 25 in the enthalpy increase auxiliary circuit, it can more efficiently absorb the refrigerant heat from the enthalpy increase main circuit in the heat exchanger 26 and become a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output from the enthalpy increase auxiliary circuit returns to the inlet of the compressor 11 after passing through the second switch valve 27 and the low-pressure gas-liquid separator 12. The medium-temperature liquid refrigerant in the enthalpy increase main path is reduced in temperature by heat exchange and becomes a low-temperature liquid refrigerant with a lower temperature. The low-temperature liquid refrigerant output by the enthalpy increase main path enters the liquid pipe 35 through the sixth switch valve 38 in one way, and the low-temperature liquid refrigerant output by the enthalpy increase main path of the heat exchanger 26 enters the enthalpy increase auxiliary path in another way. The medium-temperature liquid refrigerant or the low-temperature liquid refrigerant enters the fourth refrigerant flow regulating device 33 in the liquid pipe 35, and becomes a low-temperature liquid refrigerant with a lower temperature after throttling and cooling by the fourth refrigerant flow regulating device 33, and then enters the third refrigerant port 141 of the indoor unit 14. The low-temperature liquid refrigerant exchanges heat with the indoor air in the indoor unit 14, and the low-temperature liquid refrigerant absorbs heat from the indoor air and evaporates to become a low-temperature gaseous refrigerant. The indoor unit 14 blows out cold air, and the low-temperature gaseous refrigerant output by the fourth refrigerant port 142 of the indoor unit 14 enters the air pipe 34.In addition, the medium-temperature liquid refrigerant or the low-temperature liquid refrigerant enters the fifth refrigerant flow regulating device 41 in the liquid pipe 35, and becomes a low-temperature liquid refrigerant with a lower temperature after throttling and cooling by the fifth refrigerant flow regulating device 41, and then enters the tenth refrigerant port 402 of the heat exchanger 40, and the low-temperature liquid refrigerant exchanges heat with the water at the end 42 in the heat exchanger 40, and the low-temperature liquid refrigerant absorbs the heat of the water and evaporates to become a low-temperature gaseous refrigerant, and the water in the end 42 becomes cold water, and the low-temperature gaseous refrigerant output by the ninth refrigerant port 401 of the heat exchanger 40 enters the air pipe 34. The low-temperature gaseous refrigerant output by the air pipe 34 passes through the seventh switch valve 39, the seventh valve port 234 and the sixth valve port 233 of the second reversing valve 23, and the low-pressure gas-liquid separator 12, and then returns to the inlet of the compressor 11, and circulates back and forth. The heat pump system can also achieve floor cooling and other effects while refrigerating, thereby improving energy utilization.

[0126] like Fig. 9As shown, in the heating mode, the second refrigerant flow regulating device 25, the third refrigerant flow regulating device 29, the fourth refrigerant flow regulating device 33, the fifth refrigerant flow regulating device 41, the third switch valve 28, the sixth switch valve 38 and the seventh switch valve 39 are opened, the second valve port 222 of the first reversing valve 22 is connected to the third valve port 223, the fourth valve port 231 of the second reversing valve 23 is connected to the seventh valve port 234, and the fifth valve port 232 of the second reversing valve 23 is connected to the sixth valve port 233. That is, when heating in winter, the high-temperature gaseous refrigerant output from the outlet of the compressor 11 enters the air pipe 34 through the third valve port 223 and the second valve port 222 of the first reversing valve 22, the fourth valve port 231 and the seventh valve port 234 of the second reversing valve 23 and the seventh switch valve 39, and the medium-temperature gaseous refrigerant enters the fourth refrigerant port 142 of the indoor unit 14 in the air pipe 34. The medium-temperature gaseous refrigerant exchanges heat with the indoor air in the indoor unit 14, and the medium-temperature gaseous refrigerant releases heat to the indoor air and condenses into medium-temperature liquid refrigerant. The indoor unit 14 blows out hot air, and the medium-temperature liquid refrigerant output from the third refrigerant port 141 of the indoor unit 14 becomes low-temperature liquid refrigerant after throttling and cooling by the fourth refrigerant flow regulating device 33, and then the low-temperature liquid refrigerant output by the fourth refrigerant flow regulating device 33 enters the liquid pipe 35. In addition, the medium-temperature gaseous refrigerant enters the ninth refrigerant port 401 of the heat exchanger 40 in the gas pipe 34, and becomes a medium-temperature liquid refrigerant after heat exchange with the water in the terminal 42 in the heat exchanger 40, and the water in the terminal 42 becomes hot water. The medium-temperature liquid refrigerant output from the tenth refrigerant port 402 of the heat exchanger 40 is throttled and cooled by the fifth refrigerant flow regulating device 41 and becomes a low-temperature liquid refrigerant. Then, the low-temperature liquid refrigerant output by the fifth refrigerant flow regulating device 41 enters the liquid pipe 35. The low-temperature liquid refrigerant output by the liquid pipe 35 enters the enthalpy increase main circuit (i.e., the fifth refrigerant port 261 and the sixth refrigerant port 262) through the sixth switch valve 38, and the low-temperature liquid refrigerant output by the liquid pipe 35 enters the enthalpy increase auxiliary circuit (i.e., the second refrigerant flow regulating device 25, the seventh refrigerant port 263 and the sixth refrigerant port 262) through the sixth switch valve 38. After the low-temperature liquid refrigerant is throttled and cooled by the second refrigerant flow regulating device 25 in the enthalpy increase auxiliary circuit, it can more efficiently absorb the refrigerant heat from the enthalpy increase main circuit in the heat exchanger 26 and become a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output by the enthalpy increase auxiliary circuit returns to the enthalpy increase port 113 of the compressor 11 through the third switch valve 28.The low-temperature liquid refrigerant in the enthalpy-increasing main path is reduced in temperature by heat exchange and becomes a low-temperature liquid refrigerant with a lower temperature. It then enters the third refrigerant flow regulating device 29 for throttling and cooling. After becoming a low-temperature liquid refrigerant with a still lower temperature, it enters the second refrigerant port 132 of the outdoor heat exchanger 13. The low-temperature liquid refrigerant evaporates and absorbs heat in the outdoor heat exchanger 13 and becomes a low-temperature gaseous refrigerant. The low-temperature gaseous refrigerant output by the first refrigerant port 131 of the outdoor heat exchanger 13 passes through the fifth valve port 232 and the sixth valve port 233 of the second reversing valve 23 and the low-pressure gas-liquid separator 12 and then returns to the inlet of the compressor 11, and circulates back and forth. The heat pump system can also achieve floor heating and other effects while heating, thereby improving energy utilization.

[0127] It should be noted here that the above-mentioned high, medium and low temperatures are only relative expressions, and the gaseous refrigerant can also refer to a gas-liquid two-phase state or a gaseous state, which is not limited here.

[0128] By implementing the present invention, the following beneficial effects are achieved:

[0129] The present invention provides the heat recovery branch 16 between the first refrigerant outlet 152 of the high-pressure gas-liquid separator 15 and the inlet of the low-pressure gas-liquid separator 12. The heat recovery branch 16 can realize the oil return of the accumulated oil in the high-pressure gas-liquid separator 15 on the one hand, and release the refrigerant migrated into the high-pressure gas-liquid separator 15 and perform pressure relief on the other hand, thereby improving the pressure balance of the system.

[0130] It is understandable that the above embodiments only express some implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above embodiments or technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope of the claims of the present invention.

Claims

1. A heat pump system, characterized in that: include: A compressor, the compressor being used to compress the refrigerant; A low-pressure gas-liquid separator, the outlet of which is connected to the inlet of the compressor; An outdoor heat exchanger, the outdoor heat exchanger comprising a first refrigerant port and a second refrigerant port, the first refrigerant port being in communication with the second refrigerant port, the first refrigerant port being respectively connected to the outlet of the compressor and the inlet of the low-pressure gas-liquid separator; At least one indoor unit, the indoor unit comprising a third refrigerant port and a fourth refrigerant port, the third refrigerant port being communicated with the fourth refrigerant port, the third refrigerant port being connected with the second refrigerant port, and the fourth refrigerant port being respectively connected with the outlet of the compressor and the inlet of the low-pressure gas-liquid separator; A high-pressure gas-liquid separator and a heat recovery branch, the high-pressure gas-liquid separator includes a first refrigerant inlet and a first refrigerant outlet, the first refrigerant inlet is communicated with the first refrigerant outlet, the first refrigerant inlet is connected to the outlet of the compressor, one path of the first refrigerant outlet is used to output the liquid refrigerant after gas-liquid separation, one path of the first refrigerant outlet is respectively connected to the second refrigerant port and the third refrigerant port, and the other path of the first refrigerant outlet is connected to the inlet of the low-pressure gas-liquid separator via the heat recovery branch.

2. The heat pump system according to claim 1, characterized in that: At least part of the heat recovery branch is a capillary tube; and / or at least part of the pipeline of the first refrigerant outlet is a capillary tube.

3. The heat pump system according to claim 1, characterized in that: The heat pump system further comprises: A branch valve is provided on the heat recovery branch.

4. The heat pump system according to claim 1, characterized in that: The heat pump system further comprises: A filtering device is provided on a pipeline of the first refrigerant outlet, and is used for filtering impurities.

5. The heat pump system according to any one of claims 1 to 4, characterized in that: The high-pressure gas-liquid separator further includes a second refrigerant outlet, the first refrigerant inlet is connected to the second refrigerant outlet, and the second refrigerant outlet is used to output the gaseous refrigerant after gas-liquid separation; The heat pump system further comprises: A heat recovery heat exchanger, the heat recovery heat exchanger is used to realize heat exchange between the refrigerant and the heat storage medium to store heat, the heat recovery heat exchanger comprises a second refrigerant inlet and a third refrigerant outlet, the second refrigerant inlet is connected to the third refrigerant outlet; The outlet of the compressor is connected to the second refrigerant inlet, the third refrigerant outlet is connected to the first refrigerant inlet, and the second refrigerant outlet is connected to the first refrigerant port and the fourth refrigerant port respectively.

6. The heat pump system according to claim 5, characterized in that: The heat pump system further comprises: A first switch valve, one outlet of the compressor is connected to the second refrigerant inlet through the first switch valve, and another outlet of the compressor is connected to the first refrigerant port and the fourth refrigerant port respectively.

7. The heat pump system according to claim 5, characterized in that: The heat pump system further comprises: The first reversing valve, the second refrigerant outlet is connected to the first refrigerant port and the fourth refrigerant port respectively through the first reversing valve.

8. The heat pump system according to claim 5, characterized in that: The heat pump system further comprises: The first refrigerant flow regulating device, the first refrigerant outlet is connected to the second refrigerant port and the third refrigerant port respectively through the first refrigerant flow regulating device.

9. The heat pump system according to claim 5, characterized in that: The heat pump system further comprises: A second refrigerant flow regulating device and a heat exchanger, the heat exchanger comprising a fifth refrigerant port, a sixth refrigerant port, a seventh refrigerant port and an eighth refrigerant port; the fifth refrigerant port is connected to the sixth refrigerant port to form an enthalpy increase main path; one end of the second refrigerant flow regulating device is connected to the pipeline between the third refrigerant port and the fifth refrigerant port, the other end of the second refrigerant flow regulating device is connected to the eighth refrigerant port via the seventh refrigerant port to form an enthalpy increase auxiliary path, and the eighth refrigerant port is connected to the inlet of the low-pressure gas-liquid separator.

10. The heat pump system according to claim 9, characterized in that: The heat pump system further comprises: The second switch valve and the third switch valve, the eighth refrigerant port is connected to the inlet of the low-pressure gas-liquid separator through the second switch valve, and the eighth refrigerant port is connected to the enthalpy increase port of the compressor through the third switch valve.

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