Heat recovery heat pump system

Abstract

The utility model relates to a heat recovery heat pump system. The heat pump system comprises a compressor used for compressing refrigerants, an indoor side heat exchanger, an outdoor side heat exchanger, a heat recovery heat exchanger, a four-way reversing valve, a first flow adjusting valve and a second flow adjusting valve, and the heat recovery heat exchanger comprises a refrigerant inlet and a refrigerant outlet. The refrigerant outlet is connected to a pipeline between one end of the indoor side heat exchanger and one end of the outdoor side heat exchanger. And an inlet of the compressor, the other end of the indoor heat exchanger and the other end of the outdoor heat exchanger are respectively connected with one valve port of the four-way reversing valve. The first flow regulating valve is arranged on a connecting pipeline between the outlet of the compressor and the four-way reversing valve, and the second flow regulating valve is arranged on a connecting pipeline between the outlet of the compressor and the refrigerant inlet. The first flow adjusting valve and the second flow adjusting valve are used for adjusting the flow proportion of the refrigerant passing through the outdoor side heat exchanger and the heat recovery heat exchanger so as to adjust heat recovery in the refrigerant during refrigeration.

Description

Technical Field

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

[0002] Traditional trigeneration (hot water, cooling, heating) air source heat pump systems can usually achieve partial heat recovery or full heat recovery. However, the existing technology cannot adjust the refrigerant flow entering the heat recovery heat exchanger, and cannot flexibly adjust the distribution of refrigerant flow according to the actual situation of the system, such as the state of the refrigerant (temperature, pressure), cooling demand, heating demand, and hot water demand. Utility Model Content

[0003] The technical problem to be solved by the present application is to provide a heat recovery heat pump system in view of the above-mentioned defects.

[0004] The technical solution adopted by the present application to solve its technical problem is: a heat recovery heat pump system, including a compressor for compressing refrigerant, an indoor heat exchanger, an outdoor heat exchanger, a heat recovery heat exchanger, a four-way reversing valve, a first flow regulating valve and a second flow regulating valve, wherein the heat recovery heat exchanger includes a refrigerant inlet and a refrigerant outlet;

[0005] The refrigerant outlet is connected to the pipeline between one end of the indoor heat exchanger and one end of the outdoor heat exchanger; the inlet of the compressor, the other end of the indoor heat exchanger and the other end of the outdoor heat exchanger are respectively connected to one of the valve ports of the four-way reversing valve;

[0006] The first flow regulating valve is provided on the connecting pipeline between the outlet of the compressor and the four-way reversing valve, and the second flow regulating valve is provided on the connecting pipeline between the outlet of the compressor and the refrigerant inlet;

[0007] The first flow regulating valve and the second flow regulating valve are used to adjust the flow ratio of the refrigerant through the outdoor heat exchanger and the heat recovery heat exchanger, so as to adjust the heat recovery in the refrigerant during cooling.

[0008] In one embodiment, the heat recovery heat pump system further includes a first solenoid valve and a second solenoid valve disposed on a connecting pipeline between the indoor heat exchanger and the outdoor heat exchanger, and the refrigerant outlet is connected between the first solenoid valve and the second solenoid valve through a pipeline; or

[0009] The heat recovery heat pump system also includes a three-way valve arranged on the connecting pipeline between the indoor heat exchanger and the outdoor heat exchanger, and the three valve ports of the three-way valve are respectively connected to one end of the indoor heat exchanger, one end of the outdoor heat exchanger and the refrigerant outlet.

[0010] In one of the embodiments, the heat recovery heat pump system further includes a first parallel module and a second parallel module;

[0011] The first parallel module is provided on the connecting pipeline between the first solenoid valve and the outdoor heat exchanger, and the second parallel module is provided on the connecting pipeline between the second solenoid valve and the indoor heat exchanger; or

[0012] The first parallel module is provided on the connecting pipeline between the three-way valve and the outdoor heat exchanger, and the second parallel module is provided on the connecting pipeline between the three-way valve and the indoor heat exchanger;

[0013] Wherein, the parallel module includes an expansion mechanism and a stop valve connected in parallel therewith.

[0014] In one of the embodiments, in the partial heat recovery mode, the second flow regulating valve and the first flow regulating valve are opened, and the refrigerant is divided into two flow paths after coming out of the compressor. A part of the refrigerant flows through the refrigerant inlet, the refrigerant outlet, and the indoor heat exchanger in sequence through the pipeline connected by the second flow regulating valve, and the other part of the refrigerant flows through the outdoor heat exchanger and the indoor heat exchanger in sequence through the pipeline connected by the first flow regulating valve and the four-way reversing valve. All the refrigerant returns to the compressor through the pipeline between the indoor heat exchanger connected to the four-way reversing valve and the compressor, thereby forming a refrigeration refrigerant circuit, and at the same time, at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger.

[0015] In one of the embodiments, in the full heat recovery mode, the second flow regulating valve is opened and the first flow regulating valve is closed. The refrigerant flows through the pipeline connected by the second flow regulating valve in sequence through the refrigerant inlet, the refrigerant outlet, the indoor heat exchanger, and returns to the inlet of the compressor through the four-way reversing valve to form a refrigeration refrigerant circuit. At the same time, all the heat of the refrigerant is exchanged in the heat recovery heat exchanger.

[0016] In one of the embodiments, in the mode of preparing domestic hot water and heating, the second flow regulating valve and the first flow regulating valve are opened, and the refrigerant is divided into two flow paths after coming out of the compressor. A part of the refrigerant flows through the refrigerant inlet, the refrigerant outlet, and the outdoor heat exchanger in sequence through the pipeline connected by the second flow regulating valve, and the other part of the refrigerant flows through the indoor heat exchanger and the outdoor heat exchanger in sequence through the pipeline connected by the first flow regulating valve and the four-way reversing valve. All the refrigerant returns to the compressor through the pipeline between the outdoor heat exchanger connected to the four-way reversing valve and the compressor, thereby forming a heating refrigerant circuit.

[0017] In one of the embodiments, in the mode of preparing domestic hot water, the second flow regulating valve is opened and the first flow regulating valve is closed. The refrigerant flows through the pipeline connected by the second flow regulating valve in sequence through the refrigerant inlet, the refrigerant outlet, the outdoor heat exchanger, and returns to the inlet of the compressor through the four-way reversing valve to form a pure refrigerant circuit for preparing hot water.

[0018] In one of the embodiments, in cooling mode, the first flow regulating valve is opened, the second flow regulating valve is closed, and after the refrigerant comes out of the compressor, the pipeline connected by the four-way reversing valve passes through the outdoor heat exchanger, the indoor heat exchanger, and the inlet of the compressor in sequence to form a cooling refrigerant circuit.

[0019] In one of the embodiments, in the heating mode, the first flow regulating valve is opened, the second flow regulating valve is closed, and after the refrigerant comes out of the compressor, the pipeline connected by the four-way reversing valve passes through the indoor heat exchanger, the outdoor heat exchanger, and the inlet of the compressor in sequence to form a heating refrigerant circuit.

[0020] In one embodiment, the heat recovery heat pump system further comprises:

[0021] A liquid storage container, the liquid storage container is arranged at the connection point between the refrigerant outlet and the pipelines of the indoor heat exchanger and the outdoor heat exchanger, the first interface of the liquid storage container is connected to the refrigerant outlet, and the second interface and the third interface of the liquid storage container are connected to the indoor heat exchanger and the outdoor heat exchanger respectively;

[0022] Wherein, the refrigerant outlet pipeline formed by the first interface and the refrigerant outlet extends into a position away from the bottom of the liquid storage container to avoid the inhalation of refrigerant, and the refrigerant pipelines formed by the second interface and the third interface and the indoor heat exchanger and the outdoor heat exchanger respectively extend into a position close to the bottom of the liquid storage container to inhale refrigerant; or

[0023] The heat recovery heat pump system further comprises a one-way valve, the input end of the one-way valve is connected to the refrigerant outlet through a pipeline, and the output end of the one-way valve is connected to the pipeline formed between the indoor heat exchanger and the outdoor heat exchanger; or

[0024] The heat recovery heat exchanger further includes a water inlet and a water outlet communicating with the water inlet, and the heat recovery heat pump system further includes:

[0025] a domestic water tank, the domestic water tank being connected to the water inlet and the water outlet respectively; or

[0026] The heat recovery heat pump system also includes:

[0027] A terminal device connected to the indoor heat exchanger and used to provide circulating water to complete heat exchange.

[0028] The heat recovery heat pump system implemented in the present application has the following beneficial effects: the present application realizes the parallel connection of the heat recovery heat exchanger and the outdoor heat exchanger in the partial heat recovery mode through two flow regulating valves, so that the refrigerant distribution ratio of the two flow paths can be adjusted according to user needs or the operating status of the unit, and the free switching between full heat recovery and partial heat recovery can be realized, so that the heat recovery heat pump system can realize partial heat recovery and full heat recovery at the same time, and can flexibly adjust the distribution of refrigerant flow according to the state of the refrigerant (temperature, pressure), cooling demand, heating demand, and hot water demand, so as to realize full utilization of heat and improve the flexibility, energy efficiency and stability of the system in different modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present application will be further described below with reference to the accompanying drawings and embodiments, in which:

[0030] Figure 1 is a schematic diagram of a heat recovery heat pump system according to an embodiment of the present application;

[0031] Figure 2 yes Figure 1 Schematic diagram of the refrigerant flow of a medium heat recovery heat pump system that prepares hot water through partial heat recovery mode while cooling;

[0032] Figure 3 yes Figure 1 Schematic diagram of the refrigerant flow of a medium heat recovery heat pump system that prepares hot water through full heat recovery mode while cooling;

[0033] Figure 4 yes Figure 1 Schematic diagram of the refrigerant flow of the medium heat recovery heat pump system for preparing hot water while heating;

[0034] Figure 5 yes Figure 1 Schematic diagram of the refrigerant flow direction of the medium heat recovery heat pump system when preparing hot water purely;

[0035] Figure 6 yes Figure 1 Schematic diagram of refrigerant flow in the medium heat recovery heat pump system in cooling mode;

[0036] Figure 7 yes Figure 1 Schematic diagram of refrigerant flow in medium heat recovery heat pump system in heating mode;

[0037] Figure 8 is a schematic diagram of a heat recovery heat pump system according to another embodiment of the present application;

[0038] Fig. 9 yes Figure 8 Schematic diagram of the refrigerant flow of a medium heat recovery heat pump system that prepares hot water through partial heat recovery mode while cooling;

[0039] Fig.10 yes Figure 8 Schematic diagram of the refrigerant flow of a medium heat recovery heat pump system that prepares hot water through full heat recovery mode while cooling.

[0040] Description of reference numerals:

[0041] 1. Compressor; 2. Heat recovery heat exchanger; 3. Indoor heat exchanger; 4. Outdoor heat exchanger; 5. First expansion mechanism; 6. First stop valve; 7. Second expansion mechanism; 8. Second stop valve; 10. Four-way reversing valve; 20. First flow regulating valve; 30. Second flow regulating valve; 40. First solenoid valve; 50. Second solenoid valve; 60. One-way valve; 70. Liquid storage container; 80. Terminal device; D. First valve port; E. Second valve port; F. Third valve port; G. Fourth valve port. DETAILED DESCRIPTION

[0042] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation methods of the present application are now described in detail with reference to the accompanying drawings.

[0043] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0044] In order to facilitate understanding of the present application, the present application will be described more comprehensively below. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0045] It should be noted that in this application, heat recovery usually refers to the situation where the indoor heat exchanger is in cooling mode, and the heat of the high-temperature and high-pressure gaseous refrigerant coming out of the compressor is used to heat domestic hot water or other heat storage media, thereby achieving heat recovery. Heat recovery is usually divided into full heat recovery and partial heat recovery.

[0046] Among them, partial heat recovery refers to the refrigerant flowing out of the compressor being used to heat domestic hot water or other heat storage media. The refrigerant does not undergo phase change or only partially undergoes phase change. The refrigerant is in a gaseous state or a gas-liquid mixed state, and only releases part of the heat to domestic hot water or other heat storage media; while full heat recovery refers to the refrigerant flowing out of the compressor being used to heat domestic hot water or other heat storage media. The refrigerant will be completely condensed into liquid or most of it will be condensed into liquid (including a small amount of gas), releasing the latent heat of phase change or releasing most of the latent heat of phase change, thereby realizing full heat recovery.

[0047] like Figure 1 As shown, one embodiment of the present application discloses a heat recovery heat pump system, including a compressor 1 for compressing refrigerant, an indoor heat exchanger 3, an outdoor heat exchanger 4, a heat recovery heat exchanger 2, a four-way reversing valve 10, a first flow regulating valve 20 and a second flow regulating valve 30. Thus, a refrigerant circulation loop is formed for the terminal device 80 and / or the domestic water tank that provides circulating water to complete heat exchange, and realizes refrigeration, heating, hot water making, heat recovery, etc. of the terminal device 80 and / or the domestic water tank. The details are as follows:

[0048] The heat recovery heat exchanger 2 includes a refrigerant inlet and a refrigerant outlet. The refrigerant outlet is connected to a pipeline between one end of the indoor heat exchanger 3 and one end of the outdoor heat exchanger 4 through a pipeline. The other end of the indoor heat exchanger 3 and the other end of the outdoor heat exchanger 4 are respectively connected to a four-way reversing valve 10.

[0049] Specifically, the heat recovery heat exchanger 2 also includes a water inlet and a water outlet connected to the water inlet, and the heat recovery heat pump system also includes a domestic water tank, which is connected to the water inlet and the water outlet, respectively. Of course, the heat recovery heat exchanger 2 can also be integrated in the domestic water tank to form an integrated device.

[0050] The first flow regulating valve 20 is disposed on the connecting pipeline between the outlet of the compressor 1 and the four-way reversing valve 10 , and the second flow regulating valve 30 is disposed on the connecting pipeline between the outlet of the compressor 1 and the refrigerant inlet.

[0051] The first flow regulating valve 20 and the second flow regulating valve 30 are used to adjust the flow ratio of the refrigerant through the outdoor heat exchanger 4 and the heat recovery heat exchanger 2, so as to adjust the heat recovery in the refrigerant during cooling.

[0052] like Figure 2As shown, in the partial heat recovery mode, the second flow regulating valve 30 and the first flow regulating valve 20 are opened, and the refrigerant is divided into two flow paths after coming out of the compressor 1. A part of the refrigerant flows through the refrigerant inlet, the refrigerant outlet, and the indoor heat exchanger 3 in sequence through the pipeline connected by the second flow regulating valve 30, and the other part of the refrigerant flows through the outdoor heat exchanger 4 and the indoor heat exchanger 3 in sequence through the pipeline connected by the first flow regulating valve 20 and the four-way reversing valve 10. All the refrigerant returns to the compressor 1 through the pipeline between the indoor heat exchanger 3 and the compressor 1 connected by the four-way reversing valve 10, thereby forming a refrigeration refrigerant circuit, and at the same time, at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger 2.

[0053] The valve opening of the second flow regulating valve 30 is inversely correlated with the current water temperature of the domestic hot water, and the valve opening of the first flow regulating valve 20 is positively correlated with the current water temperature of the domestic hot water.

[0054] It should be noted that, generally speaking, partial heat recovery and full heat recovery mainly depend on whether the refrigerant undergoes phase change. Partial heat recovery means that the refrigerant flowing out of the compressor is used to heat domestic hot water or other heat storage media. The refrigerant does not undergo phase change or only partially undergoes phase change. The refrigerant is in a gaseous state or a gas-liquid mixed state, and only releases part of the heat to domestic hot water or other heat storage media. Full heat recovery means that when the refrigerant flowing out of the compressor is used to heat domestic hot water or other heat storage media, the refrigerant will be completely condensed into liquid or most of it will be condensed into liquid (including a small amount of gas), releasing the latent heat of phase change or releasing most of the latent heat of phase change, thereby realizing full heat recovery.

[0055] The partial heat recovery mode mentioned in this application includes the following two operating states:

[0056] First: a part of the gaseous refrigerant coming out of the compressor 1 enters the heat recovery heat exchanger 2 through the second flow regulating valve 30. If the temperature of the domestic water is high, the refrigerant cannot release a large amount of heat in the heat recovery heat exchanger 2, so that the refrigerant is still in a gaseous state or a gas-liquid mixed state after leaving the heat recovery heat exchanger 2. At this time, the heat of the refrigerant is not completely released, and it cannot be directly sent to the indoor heat exchanger 3 through the expansion mechanism for evaporative cooling; therefore, the first flow regulating valve 20 is opened at the same time, so that part of the refrigerant flows to the outdoor heat exchanger 4 for condensation, and then mixed with the refrigerant coming out of the heat recovery heat exchanger 2, so that the refrigerant can meet the conditions for entering the indoor heat exchanger 3 for evaporative cooling, and then the refrigerant is sent to the indoor heat exchanger 3 through the expansion mechanism for cooling.

[0057] Second: When the temperature of domestic hot water is low, in the partial heat recovery mode, a part of the refrigerant enters the heat recovery heat exchanger 2 through the second flow regulating valve 30, and all or most of the phase change occurs in the heat recovery heat exchanger 2 to release the latent heat of phase change. The refrigerant is in liquid state or most of it is in liquid state (a small amount of gas state). The excess refrigerant enters the outdoor heat exchanger 4 through the first flow regulating valve 20 for condensation, and then mixes with the refrigerant coming out of the heat recovery heat exchanger 2, so that the refrigerant can meet the conditions for entering the indoor heat exchanger 3 for evaporative cooling. Then, the refrigerant is sent to the indoor heat exchanger 3 for cooling through the expansion mechanism.

[0058] That is to say, part of the refrigerant flowing out of the compressor 1 flows into the first flow regulating valve 20, and part flows into the second flow regulating valve 30, which is the partial heat recovery mode mentioned in the present application.

[0059] like Figure 3 As shown, in the full heat recovery mode, the second flow regulating valve 30 is opened and the first flow regulating valve 20 is closed. The refrigerant flows through the pipeline connected by the second flow regulating valve 30 in sequence through the refrigerant inlet, the refrigerant outlet, the indoor heat exchanger 3, and returns to the inlet of the compressor 1 through the four-way reversing valve 10 to form a refrigeration refrigerant circuit. At the same time, all the heat of the refrigerant is exchanged in the heat recovery heat exchanger 2.

[0060] It can be understood that in the full heat recovery mode, the temperature of domestic hot water is relatively low, and the gaseous refrigerant coming out of the compressor 1 all enters the heat recovery heat exchanger 2 to transfer heat to the domestic hot water. The refrigerant leaving the heat recovery heat exchanger 2 all or most of it undergoes a phase change, that is, the refrigerant is in a liquid state or most of it is in a liquid state (including a small amount of gas). At this time, the heat of the refrigerant is basically released completely, and it can meet the conditions for entering the indoor heat exchanger 3 for evaporative cooling. Therefore, the refrigerant does not need to flow to the outdoor heat exchanger 4 for further heat release and condensation, but is directly sent to the indoor heat exchanger 3 for evaporative cooling through the expansion mechanism, thereby realizing full recovery of heat under refrigeration conditions.

[0061] Therefore, when the user has both cooling demand and domestic hot water demand, and the water temperature of the domestic hot water module is low, the system operates in full heat recovery mode. When the domestic hot water temperature continues to rise and reaches a certain set value, the system automatically switches to partial heat recovery mode. When the domestic hot water temperature is at a relatively high temperature or the demand for domestic hot water is not large, the system operates in partial heat recovery mode. When the water temperature of the domestic hot water module continues to decrease and reaches a certain set value, the system automatically switches to full heat recovery mode.

[0062] In this embodiment, two flow regulating valves are used to connect the heat recovery heat exchanger 2 and the outdoor heat exchanger 4 in parallel in the partial heat recovery mode, so that the refrigerant distribution ratio of the two flow paths can be adjusted according to user needs or the operating status of the unit, and free switching between full heat recovery and partial heat recovery can be achieved, so that the heat recovery heat pump system can achieve partial heat recovery and full heat recovery at the same time, and can flexibly adjust the distribution of refrigerant flow according to the state of the refrigerant (temperature, pressure), cooling demand, and hot water demand, so as to fully utilize the heat and improve the flexibility, energy efficiency and stability of the system in different modes.

[0063] In some embodiments, the heat recovery heat pump system further includes a first solenoid valve 40 and a second solenoid valve 50 disposed on a connecting pipeline between the indoor heat exchanger 3 and the outdoor heat exchanger 4, and the refrigerant outlet is connected between the first solenoid valve 40 and the second solenoid valve 50 through a pipeline.

[0064] In some embodiments, the heat recovery heat pump system further includes a first parallel module and a second parallel module.

[0065] The first parallel module is provided on the connecting pipeline between the first solenoid valve 40 and the outdoor heat exchanger 4, and the second parallel module is provided on the connecting pipeline between the second solenoid valve 50 and the indoor heat exchanger 3. The parallel module includes an expansion mechanism and a stop valve connected in parallel therewith.

[0066] The first parallel module is composed of a first expansion mechanism 5 and a first stop valve 6 connected in parallel, and the second parallel module is composed of a second expansion mechanism 7 and a second stop valve 8 connected in parallel.

[0067] Preferably, the first stop valve 6 and the second stop valve 8 are solenoid valves.

[0068] Alternatively, the expansion mechanism is not limited to a thermal expansion valve, an electronic expansion valve, a capillary tube, etc.

[0069] like Figure 1 As shown, the connecting pipeline between the first solenoid valve 40 and the outdoor heat exchanger 4 is connected with a first expansion mechanism 5 and a first stop valve 6 in parallel; the connecting pipeline between the second solenoid valve 50 and the indoor heat exchanger 3 is connected with a second expansion mechanism 7 and a second stop valve 8 in parallel. In this embodiment, the stop valve is preferably a solenoid valve capable of bidirectional flow, so that the heat recovery heat pump system can realize selective flow in two directions according to six operating modes.

[0070] In another optional embodiment, the heat recovery heat pump system also includes a three-way valve arranged on the connecting pipeline between the indoor heat exchanger (3) and the outdoor heat exchanger (4), and the three valve ports of the three-way valve are respectively connected to one end of the indoor heat exchanger (3), one end of the outdoor heat exchanger (4) and the refrigerant outlet.

[0071] Then, the first parallel module is arranged on the connecting pipeline between the three-way valve and the outdoor heat exchanger (4), and the second parallel module is arranged on the connecting pipeline between the three-way valve and the indoor heat exchanger (3).

[0072] In this embodiment, the first solenoid valve 40 and the second solenoid valve 50 can be replaced with a three-way valve, thereby reducing the number of valve components and lowering the batch production cost.

[0073] In some embodiments, the heat recovery heat pump system further includes a one-way valve 60, the input end of the one-way valve 60 is connected to the refrigerant outlet through a pipeline, and the output end of the one-way valve 60 is connected to the pipeline formed between the indoor heat exchanger 3 and the outdoor heat exchanger 4. Figure 1 As shown, the heat recovery heat exchanger 2 and the indoor heat exchanger 3 form a refrigerant pipeline through the one-way valve 60 and the second solenoid valve 50, and the heat recovery heat exchanger 2 and the outdoor heat exchanger 4 form a refrigerant pipeline through the one-way valve 60 and the first solenoid valve 40. In this embodiment, a one-way valve 60 is provided between the refrigerant outlet of the heat recovery heat exchanger 2 and the indoor heat exchanger 3 and the outdoor heat exchanger 4, which can prevent the refrigerant from flowing back and further improve the heat exchange efficiency.

[0074] like Figure 2 As shown, in the partial heat recovery mode, the first valve port D and the second valve port E of the four-way reversing valve 10 are connected, the third valve port F and the fourth valve port G of the four-way reversing valve 10 are connected, the first flow regulating valve 20 and the second flow regulating valve 30 are both opened, at this time, the first expansion mechanism 5 and the second stop valve 8 are closed, the first stop valve 6 and the second expansion mechanism 7 are opened, and the first solenoid valve 40, the second solenoid valve 50 and the one-way valve 60 are all opened.

[0075] The high-temperature gas output from the outlet of the compressor 1 is divided into two parallel flow paths. A part of the refrigerant enters the refrigerant inlet of the heat recovery heat exchanger 2 through the pipeline connected by the second flow regulating valve 30. The high-temperature gas is heat exchanged in the heat recovery heat exchanger 2 and becomes a medium-temperature gas after preparing hot water. At the same time, another part of the refrigerant enters the outdoor heat exchanger 4 through the pipeline connected by the first flow regulating valve 20 and the four-way reversing valve 10 for condensation and heat release to form a medium-temperature liquid. Then, the medium-temperature gas output from the refrigerant outlet of the heat recovery heat exchanger 2 passes through the one-way valve 60 and the second solenoid valve 50 and the medium-temperature liquid output from the outdoor heat exchanger 4 passes through the first stop valve 6 and the first solenoid valve 40 and is fully mixed. The mixed refrigerant is depressurized and cooled in the second expansion mechanism 7 to become a low-temperature liquid and flow into the indoor heat exchanger 3 for evaporation and heat absorption (heat exchange with the circulating water of the terminal device 80), and the indoor cooling effect is achieved by absorbing indoor heat. After the low-temperature liquid absorbs the indoor heat and evaporates into a low-temperature gas, it passes through the four-way reversing valve 10 and finally returns to the inlet of the compressor 1, and circulates back and forth. As a result, during summer cooling, at least part of the condensation heat originally used for heat exchange with the air in the outdoor heat exchanger 4 can be recovered and utilized, avoiding the waste of all heat in the heat exchange between the outdoor heat exchanger 4 and the air. The recovered heat is used to complete the heat exchange in the heat recovery heat exchanger 2 to prepare hot water, thereby improving energy utilization.

[0076] In this embodiment, the refrigerant flow rate is proportionally distributed through two flow regulating valves according to user needs, so that the refrigerants in different states in the two refrigerant circuits are fully mixed. It can automatically switch freely between full heat recovery and partial heat recovery according to user usage requirements, refrigerant state (temperature, pressure) and cooling and hot water needs.

[0077] like Figure 3 As shown, in the full heat recovery mode, the second flow regulating valve 30 is opened, the first flow regulating valve 20 is closed, the third valve port F and the fourth valve port G of the four-way reversing valve 10 are connected, at this time, the one-way valve 60, the second solenoid valve 50, and the second expansion mechanism 7 are opened, and the other valves and the first expansion mechanism 5 are closed.

[0078] All high-temperature gases output from the outlet of the compressor 1 enter the refrigerant inlet of the heat recovery heat exchanger 2 through the second flow regulating valve 30. The high-temperature gas exchanges heat in the heat recovery heat exchanger 2 and becomes a medium-temperature liquid after preparing hot water. The medium-temperature liquid output from the refrigerant outlet of the heat recovery heat exchanger 2 flows into the second expansion mechanism 7 through the pipeline connected by the one-way valve 60 and the second solenoid valve 50, and is depressurized and cooled in the second expansion mechanism 7 to form a low-temperature liquid output to the indoor heat exchanger 3. The low-temperature liquid evaporates and absorbs heat in the indoor heat exchanger 3 (exchanges heat with the circulating water of the terminal device 80), and achieves indoor cooling effect by absorbing indoor heat. After the low-temperature liquid absorbs the indoor heat and evaporates to become a low-temperature gas, it passes through the pipeline connected by the four-way reversing valve 10 and finally returns to the inlet of the compressor 1, and circulates back and forth. As a result, during summer cooling, all the condensation heat originally used for heat exchange with the air in the outdoor heat exchanger 4 can be recovered and utilized, avoiding the waste of all heat in the heat exchange between the outdoor heat exchanger 4 and the air. The recovered heat is used to complete the heat exchange in the heat recovery heat exchanger 2 to quickly prepare hot water, thereby improving energy utilization and heat exchange efficiency.

[0079] like Figure 4 As shown, in the preparation of domestic hot water and heating mode, the second flow regulating valve 30 and the first flow regulating valve 20 are opened, the first valve port D and the third valve port F of the four-way reversing valve 10 are connected, and the second valve port E and the fourth valve port G are connected. At this time, the one-way valve 60, the first solenoid valve 40, and the second solenoid valve 50 are all opened, the first stop valve 6 and the second expansion mechanism 7 are closed, and the second stop valve 8 and the first expansion mechanism 5 are opened.

[0080] The high-temperature gas refrigerant output from the outlet of the compressor 1 is divided into two flow paths. A part of the refrigerant passes through the refrigerant inlet of the heat recovery heat exchanger 2 through the pipeline connected by the second flow regulating valve 30. The high-temperature gas is heat-exchanged in the heat recovery heat exchanger 2 and becomes a medium-temperature gas after preparing hot water. At the same time, another part of the refrigerant enters the indoor heat exchanger 3 through the pipeline connected by the first flow regulating valve 20 and the four-way reversing valve 10. The indoor heat exchanger 3 exchanges heat with the circulating water of the terminal device 80 to form a medium-temperature liquid, and the heat of the refrigerant is transferred to the indoor terminal device 80 to achieve the indoor heating effect. Then, the medium-temperature gas output from the refrigerant outlet of the heat recovery heat exchanger 2 passes through the one-way valve 60 and the medium-temperature liquid output from the indoor heat exchanger 3 passes through the second stop valve 8 and the second solenoid valve 50 and is fully mixed. The mixed refrigerant enters the first expansion mechanism 5 through the pipeline connected by the first solenoid valve 40 to release pressure and cool down to form a low-temperature liquid and output to the outdoor heat exchanger 4. The low-temperature liquid exchanges heat in the outdoor heat exchanger 4, and absorbs external heat to evaporate and absorb heat to form low-temperature gas. The low-temperature gas finally returns to the inlet of the compressor 1 through the pipeline connected by the four-way reversing valve 10, and circulates back and forth. In this way, hot water can be prepared while heating in winter, improving energy utilization, and the distribution of refrigerant flow can be flexibly adjusted according to user needs, the state of the refrigerant (temperature, pressure), heating needs, and hot water needs.

[0081] In this embodiment, the valve opening of the second flow regulating valve 30 is inversely correlated with the current water temperature of the domestic hot water, and the valve opening of the first flow regulating valve 20 is positively correlated with the current water temperature of the domestic hot water. That is, the higher the current water temperature of the domestic hot water, the greater the valve opening of the first flow regulating valve 20, and the smaller the valve opening of the second flow regulating valve 30, and vice versa.

[0082] like Figure 5 As shown, in the mode of preparing domestic hot water, the second flow regulating valve 30 is opened and the first flow regulating valve 20 is closed. The refrigerant flows through the pipeline connected by the second flow regulating valve 30 in sequence through the refrigerant inlet, the refrigerant outlet, the outdoor heat exchanger 4, and returns to the inlet of the compressor 1 through the four-way reversing valve 10 to form a refrigerant circuit for pure hot water preparation. The refrigerant releases heat in the heat recovery heat exchanger 2 to produce pure hot water.

[0083] At this time, the second valve port E and the fourth valve port G of the four-way reversing valve 10 are connected, the one-way valve 60, the first solenoid valve 40 and the first expansion mechanism 5 are all open, and the other valves and the second expansion mechanism 7 are all closed. The high-temperature gas output from the outlet of the compressor 1 first enters the refrigerant inlet of the heat recovery heat exchanger 2 through the pipeline connected by the second flow regulating valve 30, and the high-temperature gas is heat exchanged in the heat recovery heat exchanger 2. After preparing hot water, it becomes a medium-temperature liquid. The medium-temperature liquid output from the refrigerant outlet of the heat recovery heat exchanger 2 enters the first expansion mechanism 5 through the pipeline connected by the one-way valve 60 and the first solenoid valve 40, and is depressurized and cooled in the first expansion mechanism 5 to form a low-temperature liquid and output to the outdoor heat exchanger 4. The low-temperature liquid evaporates and absorbs heat in the outdoor heat exchanger 4 to become a low-temperature gas, and the low-temperature gas finally returns to the inlet of the compressor 1 through the pipeline connected by the four-way reversing valve 10, and circulates back and forth to form a pure refrigerant circuit for preparing hot water. As a result, all the heat from the compressor 1 can be used alone for heat exchange in the heat recovery heat exchanger 2 to prepare domestic hot water. This embodiment can make targeted use of energy, shorten the refrigerant loop when making hot water, and does not need to pass through the indoor heat exchanger 3, so the heat exchange efficiency is higher, and the distribution of the refrigerant flow can be flexibly adjusted according to user needs, the state of the refrigerant (temperature, pressure), and the demand for hot water.

[0084] like Figure 6 As shown, in the cooling mode, the first flow regulating valve 20 is opened and the second flow regulating valve 30 is closed. After the refrigerant comes out of the compressor 1, the pipeline connected by the four-way reversing valve 10 passes through the outdoor heat exchanger 4, the indoor heat exchanger 3, and the inlet of the compressor 1 in sequence to form a cooling refrigerant circuit.

[0085] At this time, the first valve port D and the second valve port E of the four-way reversing valve 10 are connected, the third valve port F and the fourth valve port G are connected, the first stop valve 6, the first solenoid valve 40, the second solenoid valve 50 and the second expansion mechanism 7 are all opened, and the one-way valve 60 and the second stop valve 8 are closed.

[0086] The high-temperature gas output from the outlet of the compressor 1 passes through the pipeline connected by the first flow regulating valve 20 and the four-way reversing valve 10 in turn and enters the outdoor heat exchanger 4. The high-temperature gas condenses and releases heat in the outdoor heat exchanger 4 and becomes a medium-temperature liquid. The medium-temperature liquid enters the second expansion mechanism 7 through the pipeline connected by the first stop valve 6, the first solenoid valve 40, and the second solenoid valve 50 to release pressure and cool down to form a low-temperature liquid and enter the indoor heat exchanger 3. The low-temperature liquid evaporates and absorbs heat in the indoor heat exchanger 3 (heat exchange with the circulating water of the terminal device 80), and achieves indoor cooling effect by absorbing indoor heat. After absorbing indoor heat, the low-temperature liquid evaporates and becomes a low-temperature gas. The low-temperature gas finally returns to the inlet of the compressor 1 through the pipeline connected by the four-way reversing valve 10, and circulates back and forth. This embodiment can flexibly adjust the distribution of the refrigerant flow according to user needs, the state of the refrigerant (temperature, pressure), and the refrigeration demand, thereby improving the energy efficiency and stability of the system in this mode.

[0087] like Figure 7 As shown, in the heating mode, the first flow regulating valve 20 is opened and the second flow regulating valve 30 is closed. After the refrigerant comes out of the compressor 1, the pipeline connected by the four-way reversing valve 10 passes through the indoor heat exchanger 3, the outdoor heat exchanger 4, and the inlet of the compressor 1 in sequence to form a heating refrigerant circuit.

[0088] At this time, the first valve port D and the third valve port F of the four-way reversing valve 10 are connected, the second valve port E and the fourth valve port G are connected, the second stop valve 8, the first solenoid valve 40 and the second solenoid valve 50 are all open, the first expansion mechanism 5 is open, and the check valve 60, the second expansion mechanism 7 and the first stop valve 6 are all closed. The high-temperature gas output from the outlet of the compressor 1 enters the indoor heat exchanger 3 through the pipeline connected by the first flow regulating valve 20 and the four-way reversing valve 10. The high-temperature gas performs heat exchange in the indoor heat exchanger 3, transfers the heat of the refrigerant to the indoor terminal device 80, thereby achieving the effect of indoor heating and forming a medium-temperature liquid. The medium-temperature liquid output from the indoor heat exchanger 3 enters the first expansion mechanism 5 through the pipeline connected by the second stop valve 8 and the first solenoid valve 40 and the second solenoid valve 50 for pressure relief and temperature reduction to form a low-temperature liquid and output to the outdoor heat exchanger 4. The low-temperature liquid evaporates and absorbs heat in the outdoor heat exchanger 4 to become a low-temperature gas. The low-temperature gas output by the outdoor heat exchanger 4 finally returns to the inlet of the compressor 1 through the pipeline conducted by the four-way reversing valve 10, and the cycle repeats. This embodiment can flexibly adjust the distribution of the refrigerant flow according to user needs, the state (temperature, pressure) of the refrigerant, and the heating demand, thereby improving the energy efficiency and stability of the system in this mode.

[0089] It should be noted here that the above-mentioned high, medium and low temperatures are only relative expressions, and gas can also refer to a gas-liquid two-phase state or a gaseous state, which is not limited here.

[0090] In this embodiment, the heat recovery heat pump system can freely switch among six operating modes, namely, cooling only, heating only, domestic hot water preparation only, domestic hot water + cooling (partial heat recovery), domestic hot water + cooling (full heat recovery), and domestic hot water + heating. It can also flexibly adjust the distribution of refrigerant flow according to the state of the refrigerant (temperature, pressure), cooling demand, heating demand, and hot water demand, thereby improving the flexibility, energy efficiency, and stability of the system in different modes.

[0091] In some embodiments, Figure 8 As shown, the heat recovery heat pump system also includes a liquid storage container 70, which is arranged at the connection point between the refrigerant outlet and the pipelines of the indoor heat exchanger 3 and the outdoor heat exchanger 4. The first interface of the liquid storage container 70 is connected to the refrigerant outlet, and the second interface and the third interface of the liquid storage container 70 are connected to the indoor heat exchanger 3 and the outdoor heat exchanger 4 respectively.

[0092] Among them, the refrigerant outlet pipeline formed by the first interface and the refrigerant outlet extends into a position away from the bottom of the liquid storage container 70 to avoid the inhalation of refrigerant, and the refrigerant pipelines formed by the second interface and the third interface and the indoor heat exchanger 3 and the outdoor heat exchanger 4 respectively extend into a position close to the bottom of the liquid storage container 70 to inhale the refrigerant.

[0093] Understandable, such as Figures 8 to 10 As shown, a liquid storage container 70 can be arranged between the first solenoid valve 40 and the second solenoid valve 50, and the pipeline formed by the refrigerant outlet is directly connected to the liquid storage container 70. The liquid storage container 70 has three interfaces, one of which is used to connect the refrigerant outlet pipeline, and the other two interfaces are respectively connected to the first solenoid valve 40 and the second solenoid valve 50. The refrigerant outlet pipeline extends to the upper position of the liquid storage container 70 (the refrigerant outlet pipeline does not need to inhale the refrigerant, and it is a one-way flow. It is preferably set to be connected to the upper position of the liquid storage container 70. The pipeline connecting the first solenoid valve 40 and the pipeline of the second solenoid valve 50 extend to the lower position of the liquid storage container 70 to ensure that the refrigerant can be inhaled.

[0094] In this embodiment, the addition of the liquid storage container 70 can ensure that when the domestic hot water + cooling mode (partial heat recovery) and the domestic hot water + heating mode are operated, the refrigerants in the two different states can be more fully mixed, thereby reaching a stable state, which is convenient for the system to carry out subsequent expansion and evaporation processes.

[0095] Fig. 9 and Fig.10 They are shown respectively Figure 8 The refrigerant flow direction of the medium heat recovery heat pump system during partial heat recovery and full heat recovery.

[0096] like Fig. 9As shown, in the partial heat recovery mode, the first valve port D and the second valve port E of the four-way reversing valve 10 are connected, the third valve port F and the fourth valve port G of the four-way reversing valve 10 are connected, the first flow regulating valve 20 and the second flow regulating valve 30 are both opened, at this time, the first expansion mechanism 5 and the second stop valve 8 are closed, the first stop valve 6 and the second expansion mechanism 7 are opened, and the first solenoid valve 40, the second solenoid valve 50 and the one-way valve 60 are all opened.

[0097] The high-temperature gas output from the outlet of the compressor 1 is divided into two parallel flow paths, and a part of the refrigerant enters the refrigerant inlet of the heat recovery heat exchanger 2 through the pipeline connected by the second flow regulating valve 30. The high-temperature gas exchanges heat in the heat recovery heat exchanger 2, becomes medium-temperature gas after preparing hot water, and flows into the liquid storage container 70 through the one-way valve 60. At the same time, another part of the refrigerant enters the outdoor heat exchanger 4 through the pipeline connected by the first flow regulating valve 20 and the four-way reversing valve 10 to condense and release heat to form medium-temperature liquid, and flows into the liquid storage container 70 through the first stop valve 6 and the first solenoid valve 40. Then, the two refrigerants in different states are fully mixed in the liquid storage container 70. The mixed refrigerant passes through the second solenoid valve 50, is depressurized and cooled in the second expansion mechanism 7, becomes a low-temperature liquid, and flows into the indoor heat exchanger 3 for evaporation and heat absorption (heat exchange with the circulating water of the terminal device 80), and achieves indoor cooling effect by absorbing indoor heat. After the low-temperature liquid absorbs indoor heat and evaporates into low-temperature gas, it passes through the four-way reversing valve 10 and finally returns to the inlet of the compressor 1, and circulates back and forth. As a result, during summer cooling, at least part of the condensation heat originally used for heat exchange with the air in the outdoor heat exchanger 4 can be recovered and utilized, avoiding the waste of all heat in the heat exchange between the outdoor heat exchanger 4 and the air. The recovered heat is used to complete the heat exchange in the heat recovery heat exchanger 2 to prepare hot water, thereby improving energy utilization. At the same time, the distribution of the refrigerant flow can be flexibly adjusted according to the state of the refrigerant (temperature, pressure), cooling demand, and hot water demand, thereby improving the heat exchange efficiency.

[0098] like Fig.10 As shown, in the full heat recovery mode, the second flow regulating valve 30 is opened, the first flow regulating valve 20 is closed, the third valve port F and the fourth valve port G of the four-way reversing valve 10 are connected, at this time, the one-way valve 60, the second solenoid valve 50, and the second expansion mechanism 7 are opened, and the other valves and the first expansion mechanism 5 are closed.

[0099] All high-temperature gases output from the outlet of the compressor 1 enter the refrigerant inlet of the heat recovery heat exchanger 2 through the second flow regulating valve 30. The high-temperature gases are heat exchanged in the heat recovery heat exchanger 2 and become medium-temperature liquid after preparing hot water. The medium-temperature liquid output from the refrigerant outlet of the heat recovery heat exchanger 2 enters the liquid storage container 70 through the one-way valve 60. Then, the refrigerant in the liquid storage container 70 flows into the second expansion mechanism 7 through the pipeline connected by the second solenoid valve 50, and is depressurized and cooled in the second expansion mechanism 7 to form a low-temperature liquid output to the indoor heat exchanger 3. The low-temperature liquid evaporates and absorbs heat in the indoor heat exchanger 3 (exchanges heat with the circulating water of the terminal device 80), and achieves indoor cooling effect by absorbing indoor heat. After the low-temperature liquid absorbs the indoor heat and evaporates to become a low-temperature gas, it passes through the pipeline connected by the four-way reversing valve 10 and finally returns to the inlet of the compressor 1, and circulates back and forth. As a result, all the condensation heat originally used for heat exchange with the air in the outdoor heat exchanger 4 can be recovered and utilized during summer cooling, avoiding all the heat being wasted in the heat exchange between the outdoor heat exchanger 4 and the air. The recovered heat is used to complete the heat exchange in the heat recovery heat exchanger 2 to quickly prepare hot water, thereby improving energy utilization. At the same time, the distribution of the refrigerant flow can be flexibly adjusted according to the state of the refrigerant (temperature, pressure), cooling demand, and hot water demand, thereby improving the heat exchange efficiency.

[0100] Based on the above embodiment, the specific refrigerant flow direction in other operating modes can refer to Figures 4 to 7 , I will not go into details here.

[0101] In this embodiment, two flow regulating valves are used to connect the heat recovery heat exchanger 2 and the outdoor heat exchanger 4 in parallel in the partial heat recovery mode, so that the refrigerant distribution ratio of the two flow paths can be adjusted according to user needs or the operating status of the unit, and free switching between full heat recovery and partial heat recovery can be achieved, so that the heat recovery heat pump system can achieve partial heat recovery and full heat recovery at the same time, and can flexibly adjust the distribution of refrigerant flow according to the state of the refrigerant (temperature, pressure), cooling demand, heating demand, and hot water demand, so as to fully utilize the heat and improve the flexibility, energy efficiency and stability of the system in different modes.

[0102] It can be understood that the terminal device 80 may include a fan disk and / or floor heating installed indoors, and may further include a hydraulic module connected between the indoor heat exchanger 3 and the fan disk and / or floor heating, which is not limited here.

[0103] It can be understood that the above embodiments only express the preferred implementation methods of the present application, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application; it should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present application; therefore, all equivalent changes and modifications made to the scope of the claims of the present application should fall within the scope of the claims of the present application.

[0104] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

Claims

1. A heat recovery heat pump system, characterized in that: It comprises a compressor (1) for compressing a refrigerant, an indoor heat exchanger (3), an outdoor heat exchanger (4), a heat recovery heat exchanger (2), a four-way reversing valve (10), a first flow regulating valve (20) and a second flow regulating valve (30), wherein the heat recovery heat exchanger (2) comprises a refrigerant inlet and a refrigerant outlet; The refrigerant outlet is connected to a pipeline between one end of the indoor heat exchanger (3) and one end of the outdoor heat exchanger (4); the inlet of the compressor, the other end of the indoor heat exchanger (3) and the other end of the outdoor heat exchanger (4) are respectively connected to one of the valve ports of the four-way reversing valve (10); The first flow regulating valve (20) is provided on the connecting pipeline between the outlet of the compressor (1) and the four-way reversing valve (10), and the second flow regulating valve (30) is provided on the connecting pipeline between the outlet of the compressor (1) and the refrigerant inlet; The first flow regulating valve (20) and the second flow regulating valve (30) are used to adjust the flow ratio of the refrigerant through the outdoor heat exchanger (4) and the heat recovery heat exchanger (2) so as to adjust the heat recovery in the refrigerant during cooling.

2. The heat recovery heat pump system according to claim 1, characterized in that: The heat recovery heat pump system further comprises a first solenoid valve (40) and a second solenoid valve (50) arranged on a connecting pipeline between the indoor heat exchanger (3) and the outdoor heat exchanger (4), and the refrigerant outlet is connected between the first solenoid valve (40) and the second solenoid valve (50) through a pipeline; or The heat recovery heat pump system also includes a three-way valve arranged on the connecting pipeline between the indoor heat exchanger (3) and the outdoor heat exchanger (4), and the three valve ports of the three-way valve are respectively connected to one end of the indoor heat exchanger (3), one end of the outdoor heat exchanger (4) and the refrigerant outlet.

3. The heat recovery heat pump system according to claim 2, characterized in that: The heat recovery heat pump system further comprises a first parallel module and a second parallel module; The first parallel module is provided on the connecting pipeline between the first solenoid valve (40) and the outdoor heat exchanger (4), and the second parallel module is provided on the connecting pipeline between the second solenoid valve (50) and the indoor heat exchanger (3); or The first parallel module is arranged on the connecting pipeline between the three-way valve and the outdoor heat exchanger (4), and the second parallel module is arranged on the connecting pipeline between the three-way valve and the indoor heat exchanger (3); Wherein, the parallel module includes an expansion mechanism and a stop valve connected in parallel therewith.

4. The heat recovery heat pump system according to any one of claims 1 to 3, characterized in that: In the partial heat recovery mode, the second flow regulating valve (30) and the first flow regulating valve (20) are opened, and the refrigerant is divided into two flow paths after coming out of the compressor (1). A part of the refrigerant flows through the refrigerant inlet, the refrigerant outlet, and the indoor heat exchanger (3) in sequence through the pipeline connected by the second flow regulating valve (30), and the other part of the refrigerant flows through the outdoor heat exchanger (4) and the indoor heat exchanger (3) in sequence through the pipeline connected by the first flow regulating valve (20) and the four-way reversing valve (10). All the refrigerant returns to the compressor (1) through the pipeline between the indoor heat exchanger (3) connected to the four-way reversing valve (10) and the compressor (1), thereby forming a refrigeration refrigerant circuit, and at least part of the heat of the refrigerant is exchanged in the heat recovery heat exchanger (2).

5. The heat recovery heat pump system according to any one of claims 1 to 3, characterized in that: In the full heat recovery mode, the second flow regulating valve (30) is opened and the first flow regulating valve (20) is closed. The refrigerant flows through the pipeline connected by the second flow regulating valve (30) in sequence through the refrigerant inlet, the refrigerant outlet, the indoor heat exchanger (3), and returns to the inlet of the compressor (1) through the four-way reversing valve (10) to form a refrigeration refrigerant circuit. At the same time, all the heat of the refrigerant is exchanged in the heat recovery heat exchanger (2).

6. The heat recovery heat pump system according to any one of claims 1 to 3, characterized in that: In the mode of preparing domestic hot water and heating, the second flow regulating valve (30) and the first flow regulating valve (20) are opened, and the refrigerant is divided into two flow paths after coming out of the compressor (1). A part of the refrigerant flows through the refrigerant inlet, the refrigerant outlet, and the outdoor heat exchanger (4) in sequence through the pipeline connected by the second flow regulating valve (30), and the other part of the refrigerant flows through the indoor heat exchanger (3) and the outdoor heat exchanger (4) in sequence through the pipeline connected by the first flow regulating valve (20) and the four-way reversing valve (10). All the refrigerant returns to the compressor (1) through the pipeline between the outdoor heat exchanger (4) connected to the four-way reversing valve (10) and the compressor (1), thereby forming a heating refrigerant circuit.

7. The heat recovery heat pump system according to any one of claims 1 to 3, characterized in that: In the domestic hot water preparation mode, the second flow regulating valve (30) is opened and the first flow regulating valve (20) is closed. The refrigerant flows through the pipeline connected by the second flow regulating valve (30) in sequence through the refrigerant inlet, the refrigerant outlet, the outdoor heat exchanger (4), and returns to the inlet of the compressor (1) through the four-way reversing valve (10) to form a pure refrigerant circuit for preparing hot water.

8. The heat recovery heat pump system according to any one of claims 1 to 3, characterized in that: In the cooling mode, the first flow regulating valve (20) is opened and the second flow regulating valve (30) is closed. After the refrigerant comes out of the compressor (1), the pipeline connected by the four-way reversing valve (10) passes through the outdoor heat exchanger (4), the indoor heat exchanger (3), and the inlet of the compressor (1) in sequence to form a cooling refrigerant circuit.

9. The heat recovery heat pump system according to any one of claims 1 to 3, characterized in that: In the heating mode, the first flow regulating valve (20) is opened and the second flow regulating valve (30) is closed. After the refrigerant comes out of the compressor (1), the pipeline connected by the four-way reversing valve (10) passes through the indoor heat exchanger (3), the outdoor heat exchanger (4), and the inlet of the compressor (1) in sequence to form a heating refrigerant circuit.

10. The heat recovery heat pump system according to any one of claims 1 to 3, characterized in that: The heat recovery heat pump system also includes: A liquid storage container (70), the liquid storage container (70) being arranged at a connection point between the refrigerant outlet and the pipelines of the indoor heat exchanger (3) and the outdoor heat exchanger (4), the first interface of the liquid storage container (70) being connected to the refrigerant outlet, and the second interface and the third interface of the liquid storage container (70) being connected to the indoor heat exchanger (3) and the outdoor heat exchanger (4) respectively; wherein the refrigerant outlet pipeline formed by the first interface and the refrigerant outlet extends into a position away from the bottom of the liquid storage container (70) to prevent the refrigerant from being sucked in, and the refrigerant pipelines formed by the second interface and the third interface and the indoor heat exchanger (3) and the outdoor heat exchanger (4) respectively extend into a position close to the bottom of the liquid storage container (70) to allow the refrigerant to be sucked in; or The heat recovery heat pump system further comprises a one-way valve (60), the input end of the one-way valve (60) being connected to the refrigerant outlet via a pipeline, and the output end of the one-way valve (60) being connected to the pipeline formed between the indoor heat exchanger (3) and the outdoor heat exchanger (4); or The heat recovery heat exchanger (2) further comprises a water inlet and a water outlet communicating with the water inlet, and the heat recovery heat pump system further comprises: a domestic water tank, the domestic water tank being connected to the water inlet and the water outlet respectively; or The heat recovery heat pump system also includes: A terminal device (80) connected to the indoor heat exchanger (3) and used to provide circulating water to complete heat exchange.

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