Triple supply heat pump system with total heat recovery

Abstract

The present application relates to a kind of triple supply heat pump systems with total heat recovery.The triple supply heat pump system with total heat recovery described in the present application, comprising: compressor, four-way valve, three-way valve, indoor heat exchanger, outdoor heat exchanger, heat recovery heat exchanger, first shunt and second shunt;And first valve assembly, second valve assembly, third valve assembly and first solenoid valve for controlling refrigerant flow direction.The triple supply heat pump system with total heat recovery described in the present application controls the flow direction of refrigerant by three-way valve combined with four-way valve, there is no case of flow, shunt;Secondly, idle heat exchanger is set to high pressure end as liquid storage tank in the system, avoid increasing pressure vessel, and in single refrigeration cut hot water, heat recovery and single heating cut single hot water mode, the efficiency and speed of hot water preparation are faster;Heat recovery heat exchanger and indoor heat exchanger can be used for defrosting of outdoor heat exchanger respectively, improve the stability of system.

Description

Technical Field

[0001] This invention relates to the field of heat pump system technology, and in particular to a triple-heat pump system with total heat recovery. Background Technology

[0002] Currently available triple-heat pump systems with total heat recovery typically include three heat exchangers. However, issues arise in controlling the refrigerant flow path during various operating mode switching. Existing technologies use two four-way valves in series to control the refrigerant flow direction; however, this still requires an additional receiver tank to store excess refrigerant, increasing pressure loss and reducing system reliability. Furthermore, this setup only allows defrosting from one heat exchanger at a time. If that heat exchanger malfunctions or is not connected to a load, the system cannot perform defrosting properly, resulting in low system stability. Additionally, the simultaneous operation of multiple electronic expansion valves in the system leads to excessive refrigerant throttling, increasing flash vapor content and reducing evaporator heat exchange efficiency. Summary of the Invention

[0003] Based on this, the purpose of this invention is to provide a triple-heat pump system with total heat recovery, which controls the refrigerant flow through a combination of a three-way valve and a four-way valve, eliminating cross-flow and diversion issues; secondly, the idle heat exchanger is placed at the high-pressure end as a liquid storage tank in the system, avoiding the need for additional pressure vessels, and the efficiency and speed of hot water production are faster in single-cooling-to-hot-water, heat recovery, and single-heating-to-hot-water modes; both the heat recovery heat exchanger and the indoor heat exchanger can be used for defrosting the outdoor heat exchanger, improving the system's stability.

[0004] A triple heat pump system with total heat recovery includes: a compressor, a four-way valve, a three-way valve, an indoor heat exchanger, an outdoor heat exchanger, a heat recovery heat exchanger, a first distributor, and a second distributor.

[0005] Each channel of the first distributor is respectively provided with a first main path, a second main path, and a third main path; the other end of the first main path is connected to the exhaust port of the compressor; the other end of the second main path is connected to the four-way valve; the other end of the third main path is connected to the three-way valve; a first solenoid valve is also provided on the second main path;

[0006] Each channel of the second diverter is respectively provided with a first flow path, a second flow path, and a third flow path at its end; the other end of the first flow path is connected to one valve port of the four-way valve, and the outdoor heat exchanger is disposed on the first flow path; the other end of the second flow path is connected to the three-way valve, and the heat recovery heat exchanger is disposed on the second flow path; the other end of the third flow path is connected to the other valve port of the four-way valve, and the indoor heat exchanger is disposed on the third flow path;

[0007] The first flow path is also provided with a first valve assembly located between the outdoor heat exchanger and the second distributor, for controlling the flow direction and flow rate of the refrigerant in the first flow path;

[0008] The second flow path is also provided with a second valve assembly located between the heat recovery heat exchanger and the three-way valve, for controlling the refrigerant flow direction and flow rate in the second flow path;

[0009] A third valve assembly is also provided in the third flow path, located between the indoor heat exchanger and the second distributor, for controlling the refrigerant flow direction and flow rate in the third flow path.

[0010] Furthermore, the first valve assembly includes a first electronic expansion valve and a first check valve arranged in parallel, wherein the flow direction of the first check valve is toward the second flow divider;

[0011] The second valve assembly includes a second solenoid valve and a second check valve arranged in parallel, with the flow directions of the second solenoid valve and the second check valve being opposite;

[0012] The third valve assembly includes a third electronic expansion valve and a third check valve arranged in parallel, with the flow direction of the third check valve facing the second diverter.

[0013] Furthermore, the triple-heat pump system with total heat recovery also includes:

[0014] The third distributor has a first return gas branch, a second return gas branch, and a third return gas branch at the end of each channel; the other end of the third return gas branch is connected to the return gas port of the compressor.

[0015] The four-way valve includes a first valve port, a second valve port, a third valve port, and a fourth valve port; the first valve port is connected to the first solenoid valve; the second valve port is connected to the outdoor heat exchanger; the third valve port is connected to the indoor heat exchanger; and the fourth valve port is connected to the first return gas branch.

[0016] The three-way valve includes a fourth valve port, a fifth valve port, and a sixth valve port; the fifth valve port is connected to the first distributor; the sixth valve port is connected to the second valve assembly; and the seventh valve port is connected to the second return gas branch.

[0017] Furthermore, the triple heat pump system with total heat recovery also includes: a gas-liquid separator, which is disposed between the third distributor and the compressor, with its inlet end connected to the third return gas branch and its outlet end connected to the exhaust port of the compressor.

[0018] Furthermore, the triple-heat pump system with total heat recovery includes a heating mode;

[0019] When the triple heat pump system with total heat recovery is in the heating mode, the three-way valve is de-energized, the first solenoid valve opens, the first electronic expansion valve opens, the third electronic expansion valve closes, and the second solenoid valve closes. In the heating mode, the refrigerant of the triple heat pump system with total heat recovery passes sequentially through the compressor, the first valve port, the third valve port, the indoor heat exchanger, the third check valve, and is diverted by the second distributor. Part of the refrigerant is injected into the heat recovery heat exchanger, and the other part is throttled by the first electronic expansion valve and flows through the outdoor heat exchanger and the second valve port, and finally returns to the compressor through the fourth valve port.

[0020] Furthermore, the triple-heat pump system with total heat recovery also includes a cooling mode;

[0021] When the triple heat pump system with total heat recovery is in the cooling mode, the three-way valve is de-energized, the first solenoid valve opens, the first electronic expansion valve closes, the third electronic expansion valve opens, and the second solenoid valve closes. In the cooling mode, the refrigerant of the triple heat pump system with total heat recovery passes sequentially through the compressor, the first solenoid valve, the first valve port, the second valve port, and the first check valve. It is then diverted by the second distributor, with one part injected into the heat recovery heat exchanger and the other part throttled by the third electronic expansion valve, flowing through the indoor heat exchanger, the third valve port, and finally returning to the compressor via the fourth valve port.

[0022] Furthermore, the triple-heat pump system with total heat recovery also includes a hot water mode;

[0023] When the triple heat pump system with total heat recovery is in the hot water mode, the first solenoid valve is closed, the three-way valve is energized, the second solenoid valve is closed, the first electronic expansion valve is open, and the third electronic expansion valve is open. In the hot water mode, the refrigerant of the triple heat pump system with total heat recovery passes sequentially through the compressor, the fifth valve port, the sixth valve port, the second check valve, the heat recovery heat exchanger, and then is diverted by the second distributor. Part of the refrigerant is injected into the indoor heat exchanger through the third electronic expansion valve, and the other part is throttled by the first electronic expansion valve and flows through the outdoor heat exchanger, the second valve port, and finally returns to the compressor through the fourth valve port.

[0024] Furthermore, the triple-heat pump system with total heat recovery also includes a cooling heat recovery mode;

[0025] When the triple heat pump system with total heat recovery is in the cooling and heat recovery mode, the first solenoid valve is closed, the three-way valve is energized, the second solenoid valve is closed, and the first and third electronic expansion valves are open. In the cooling and heat recovery mode, the refrigerant of the triple heat pump system with total heat recovery passes sequentially through the compressor, the fifth valve port, the sixth valve port, the second check valve, and the heat recovery heat exchanger. Then, it is split by the second distributor. Part of it is injected into the outdoor heat exchanger through the first electronic expansion valve, and the other part is throttled by the third electronic expansion valve and flows through the indoor heat exchanger, the third valve port, and finally returns to the compressor through the fourth valve port.

[0026] Furthermore, the triple-heat pump system with total heat recovery also includes a defrosting mode; the defrosting mode includes a first defrosting mode based on the heat recovery heat exchanger and a second defrosting mode based on the indoor heat exchanger.

[0027] Furthermore, when the triple heat pump system with total heat recovery is in the first defrost mode, the three-way valve is de-energized, the first solenoid valve opens, the second solenoid valve opens, the first electronic expansion valve closes, and the third electronic expansion valve closes; the refrigerant of the triple heat pump system with total heat recovery in the first defrost mode passes sequentially through the compressor, the first valve interface, the second valve interface, the outdoor heat exchanger, the first check valve, the heat recovery heat exchanger, the sixth valve interface, and the seventh valve interface back to the compressor;

[0028] When the triple heat pump system with total heat recovery is in the second defrost mode, the three-way valve is de-energized, the first solenoid valve is open, the third electronic expansion valve is fully open, the first electronic expansion valve is closed, and the second solenoid valve is closed. In the second defrost mode, the refrigerant of the triple heat pump system with total heat recovery passes sequentially through the compressor, the first solenoid valve, the first valve port, the second valve port, and the first check valve. It is then diverted by the second distributor, with one part injected into the heat recovery heat exchanger and the other part flowing through the third electronic expansion valve, through the indoor heat exchanger, the third valve port, and finally back to the compressor via the fourth valve port.

[0029] The beneficial effects of this invention are as follows:

[0030] (1) The refrigerant flow direction is controlled by a combination of a three-way valve and a four-way valve. There is no cross-flow or diversion, which makes it more flexible and can cover a variety of working conditions.

[0031] (2) The idle heat exchanger is set at the high pressure end as a liquid storage tank to avoid adding a pressure vessel, and the efficiency and speed of hot water production are faster when switching from cooling mode to hot water mode, cooling heat recovery mode and heating mode to hot water mode.

[0032] (3) The heat recovery heat exchanger and the indoor heat exchanger can form a loop with the outdoor heat exchanger for defrosting, thereby improving the stability of the system;

[0033] (4) The parallel connection of one-way valve and electronic expansion valve makes the flow control more stable and allows for reasonable adjustment of the number of electronic expansion valves connected to the refrigerant flow path, thus avoiding excessive throttling.

[0034] (5) The heat pump system recovers all heat and can provide free cooling when operating heating / hot water.

[0035] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0036] Figure 1 A schematic diagram of a triple-heat pump system with total heat recovery provided in an embodiment of this application;

[0037] Figure 2 A diagram showing the refrigerant flow direction of a triple-heat pump system with total heat recovery in heating mode;

[0038] Figure 3 A diagram showing the refrigerant flow direction of a triple-heat pump system with total heat recovery in cooling / second defrosting mode;

[0039] Figure 4 A diagram showing the refrigerant flow direction of a triple-heat pump system with total heat recovery in hot water mode;

[0040] Figure 5 A diagram showing the refrigerant flow direction of a triple-heat pump system with total heat recovery in cooling heat recovery mode;

[0041] Figure 6 This is a diagram showing the refrigerant flow direction of a triple-heat pump system with total heat recovery in the first defrost mode.

[0042] In the diagram, 10-compressor; 20-four-way valve; 21-first valve interface; 22-second valve interface; 23-third valve interface; 24-fourth valve interface; 30-three-way valve; 31-fifth valve interface; 32-sixth valve interface; 33-seventh valve interface; 40-outdoor heat exchanger; 50-heat recovery heat exchanger; 60-indoor heat exchanger; 71-first distributor; 711-first main path; 712-second main path; 713-third main path; 72-second distributor; 721-first flow path; 722-Second flow path; 723-Third flow path; 73-Third distributor; 731-First return gas branch; 732-Second return gas branch; 733-Third return gas branch; 81-First valve assembly; 811-First electronic expansion valve; 812-First check valve; 82-Second valve assembly; 821-Second solenoid valve; 822-Second check valve; 83-Third valve assembly; 831-Third electronic expansion valve; 832-Third check valve; 84-First solenoid valve; 90-Gas-liquid separator. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] In the description of this invention, it should be noted that the terms "vertical direction," "up," "down," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In existing technologies, two four-way valves are connected in series to control the flow of refrigerant. However, this still requires adding a liquid receiver to store excess refrigerant in the system. Increasing the pressure vessel increases pressure loss and reduces system reliability. Furthermore, this setup only allows defrosting from one side of the heat exchanger. If the heat exchanger malfunctions or is not connected to a load, the system cannot perform defrosting properly, resulting in low system stability.

[0047] Based on this, this application provides a triple-heat pump system with total heat recovery. The refrigerant flow direction is controlled by a three-way valve combined with a four-way valve, eliminating cross-flow and diversion. Secondly, the idle heat exchanger is placed at the high-pressure end as a liquid storage tank in the system, avoiding the need for additional pressure vessels. Furthermore, the efficiency and speed of hot water production are faster in single-cooling-to-hot-water, heat recovery, and single-heating-to-hot-water modes. Both the heat recovery heat exchanger and the indoor heat exchanger can be used for defrosting the outdoor heat exchanger, improving the system's stability.

[0048] Please see Figure 1 This application provides a triple heat pump system with total heat recovery, including: a compressor 10, a four-way valve 20, a three-way valve 30, an indoor heat exchanger 60, an outdoor heat exchanger 40, a heat recovery heat exchanger 50, a gas-liquid separator 90, a first distributor 71, and a second distributor 72, wherein the heat recovery heat exchanger 50 and the indoor heat exchanger 60 are connected to the unit's water circuit.

[0049] Specifically, each channel of the first distributor 71 is provided with a first main path 711, a second main path 712, and a third main path 713 at its end; the other end of the first main path 711 is connected to the exhaust port of the compressor 10; the other end of the second main path 712 is connected to a four-way valve 20; the other end of the third main path 713 is connected to a three-way valve 30, which controls whether the high-pressure refrigerant discharged from the compressor 10 enters the circulation loop through the three-way valve 30 by energizing / de-energizing; a first solenoid valve 84 is provided on the second main path 712 to control whether the high-pressure refrigerant discharged from the compressor 10 enters the circulation loop through the four-way valve 20.

[0050] Specifically, each channel of the second diverter 72 is provided with a first flow path 721, a second flow path 722, and a third flow path 723 at its end; the other end of the first flow path 721 is connected to one of the valve ports of the four-way valve 20, and the outdoor heat exchanger 40 is disposed on the first flow path 721; the other end of the second flow path 722 is connected to the three-way valve 30, and the heat recovery heat exchanger 50 is disposed on the second flow path 722; the other end of the third flow path 723 is connected to one of the valve ports of the four-way valve 20, and the indoor heat exchanger 60 is disposed on the third flow path 723.

[0051] Furthermore, a first valve assembly 81 is provided on the first flow path 721, located between the outdoor heat exchanger 40 and the second distributor 72, for controlling the flow direction and flow rate of the refrigerant in the first flow path 721; a second valve assembly 82 is provided on the second flow path 722, located between the heat recovery heat exchanger 50 and the three-way valve 30, for controlling the flow direction and flow rate of the refrigerant in the second flow path 722; and a third valve assembly 83 is provided on the third flow path 723, located between the indoor heat exchanger 60 and the second distributor 72, for controlling the flow direction and flow rate of the refrigerant in the third flow path 723.

[0052] Specifically, the first valve assembly 81 includes a first electronic expansion valve 811 and a first check valve 812 arranged in parallel, with the first check valve 812 flowing towards the second distributor 72; the second valve assembly 82 includes a second solenoid valve 821 and a second check valve 822 arranged in parallel, with the flow directions of the second solenoid valve 821 and the second check valve 822 being opposite, with the second check valve 822 flowing towards the heat recovery heat exchanger 50; the third valve assembly 83 includes a third electronic expansion valve 831 and a third check valve 832 arranged in parallel, with the third check valve 832 flowing towards the second distributor 72.

[0053] Furthermore, the heat pump system also includes a third distributor 73, with a first return gas branch 731, a second return gas branch 732, and a third return gas branch 733 respectively provided at the end of each channel of the third distributor 73; the other end of the first return gas branch 731 is connected to a four-way valve 20, the other end of the second return gas branch 732 is connected to a three-way valve 30, and the other end of the third return gas branch 733 is connected to a gas-liquid separator 90.

[0054] Specifically, the four-way valve 20 includes a first valve port 21, a second valve port 22, a third valve port 23, and a fourth valve port 24; the first valve port 21 is connected to the first solenoid valve 84; the second valve port 22 is connected to the outdoor heat exchanger 40; the third valve port 23 is connected to the indoor heat exchanger 60; and the fourth valve port 24 is connected to the first return gas branch 731. The three-way valve 30 includes a fourth valve port 24, a fifth valve port 31, and a sixth valve port 32; the fifth valve port 31 is connected to the second distributor 72; the sixth valve port 32 is connected to the second valve assembly 82; and the seventh valve port 33 is connected to the second return gas branch 732.

[0055] This heat pump system connects a four-way valve 20 and a three-way valve 30 in parallel via a first distributor 71. High-pressure gaseous refrigerant flowing from the compressor 10's exhaust port flows through the first distributor 71 to the three-way valve 30 and / or the four-way valve 20. The refrigerant can enter the circulation loop via the four-way valve 20, with the indoor heat exchanger 60 or the outdoor heat exchanger 40 acting as the condenser; alternatively, the refrigerant can enter the circulation loop via the three-way valve 30, with the heat recovery heat exchanger 50 acting as the condenser. This system can cover multiple operating modes, including heating, cooling, hot water, cooling heat recovery, and defrosting. It should be noted that in this embodiment, the outdoor heat exchanger 40 can be a finned heat exchanger, and the indoor heat exchanger 60 and the heat recovery heat exchanger 50 can be plate heat exchangers, shell-and-tube heat exchangers, or other heat exchanger types that enable various operating modes, and are not limited to these.

[0056] The principle of this heat pump system will be explained below in conjunction with its specific operating mode.

[0057] Please see Figure 2 When the triple-heat pump system with total heat recovery is in heating mode, the three-way valve 30 is de-energized, the first solenoid valve 84 opens, and the high-pressure refrigerant discharged by the compressor 10 enters the circulation loop via the four-way valve 20. At this time, the first electronic expansion valve 811 opens, the third electronic expansion valve 831 closes, and the second solenoid valve 821 closes; the first valve port 21 and the third valve port 23 are connected, the second valve port 22 and the fourth valve port 24 are connected, the indoor heat exchanger 60 acts as a condenser, the outdoor heat exchanger 40 acts as an evaporator, and the idle heat recovery heat exchanger 50 acts as a high-pressure liquid storage tank.

[0058] In heating mode, the refrigerant of the triple-heat pump system with total heat recovery sequentially passes through the compressor 10, the first valve port 21, and the third valve port 23, and then enters the indoor heat exchanger 60 to condense into high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows through the third one-way valve 832 to the second distributor 72 for diversion. A portion of the high-pressure liquid refrigerant is injected into the heat recovery heat exchanger 50 until the pressure is balanced, while the other portion flows through the first electronic expansion valve 811 and is throttled to the outdoor heat exchanger 40 to evaporate and obtain low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant flows through the second valve port 22, the fourth valve port 24, and the gas-liquid separator 90 back to the compressor 10.

[0059] In heating mode, this triple-heat pump system with total heat recovery can meet the user's heating and underfloor heating needs. Simultaneously, the heat recovery heat exchanger 50 acts as a high-pressure liquid storage tank; the temperature inside the heat exchanger gradually increases with the injection of high-pressure liquid. This significantly accelerates the hot water production speed when switching from heating mode to hot water mode, saving energy and better meeting user needs. Furthermore, in heating mode, only the first electronic expansion valve 811, located after the second distributor 72, is needed for throttling control of the circulation loop, reducing the number of electronic expansion valves in the system and thus avoiding excessive throttling. This also allows the heat recovery heat exchanger 50 to be placed at the high-pressure end of the circulation loop, preventing problems such as freezing and cracking caused by the heat recovery heat exchanger 50 being at the low-pressure end.

[0060] Please see Figure 3 When the triple-heat pump system with total heat recovery is in cooling mode, the three-way valve 30 is de-energized, the first solenoid valve 84 opens, and the high-pressure refrigerant discharged by the compressor 10 enters the circulation loop via the four-way valve 20. At this time, the third electronic expansion valve 831 opens, the first electronic expansion valve 811 closes, and the second solenoid valve 821 closes; the first valve port 21 and the second valve port 22 are connected, the third valve port 23 and the fourth valve port 24 are connected, the outdoor heat exchanger 40 acts as a condenser, the indoor heat exchanger 60 acts as an evaporator, and the idle heat recovery heat exchanger 50 acts as a high-pressure liquid storage tank.

[0061] In the cooling mode, the refrigerant of the triple-heat pump system with total heat recovery sequentially passes through the compressor 10, the first valve port 21, and the second valve port 22, and then enters the outdoor heat exchanger 40 to condense into high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows through the first one-way valve 812 to the second distributor 72 for diversion. A portion of the high-pressure liquid refrigerant is injected into the heat recovery heat exchanger 50 until the pressure is balanced, while the other portion flows through the third electronic expansion valve 831 and then to the indoor heat exchanger 60 for evaporation to obtain low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant flows through the third valve port 23, the fourth valve port 24, and the gas-liquid separator 90 back to the compressor 10.

[0062] In cooling mode, this triple-heat pump system with total heat recovery can meet the user's cooling needs. Similar to heating mode, in cooling mode, the heat recovery heat exchanger 50 acts as a high-pressure liquid storage tank. The temperature inside the heat exchanger gradually increases as high-pressure liquid is injected. This significantly accelerates the hot water production speed when switching from cooling mode to hot water mode or cooling-heat recovery mode, saving energy and better meeting user needs. Furthermore, in cooling mode, only the third electronic expansion valve 831, located after the second distributor 72, needs to be retained for throttling control of the circulation loop, reducing the number of electronic expansion valves in the system and thus avoiding excessive throttling. Simultaneously, this allows the heat recovery heat exchanger 50 to be placed at the high-pressure end of the circulation loop, preventing problems such as freezing and cracking caused by the heat recovery heat exchanger 50 being at the low-pressure end.

[0063] Please see Figure 4 When the triple-heat pump system with total heat recovery is in hot water mode, the first solenoid valve 84 is closed, and the high-pressure refrigerant discharged by the compressor 10 enters the circulation loop through the three-way valve 30. At this time, the first electronic expansion valve 811 is open, the third electronic expansion valve 831 is fully open, and the second solenoid valve 821 is closed; the fifth valve port 31 and the sixth valve port 32 are connected, the second valve port 22 and the fourth valve port 24 are connected, the heat recovery heat exchanger 50 acts as a condenser, the outdoor heat exchanger 40 acts as an evaporator, and the idle indoor heat exchanger 60 acts as a high-pressure liquid storage tank.

[0064] In the hot water mode, the refrigerant of the triple-heat pump system with total heat recovery sequentially passes through the compressor 10, the fifth valve port 31, and the sixth valve port 32. Then, it enters the heat recovery heat exchanger 50 through the second one-way valve 822 to condense into high-pressure liquid refrigerant, which flows to the second distributor 72 for diversion. Part of the high-pressure liquid refrigerant is injected into the indoor heat exchanger 60 through the third electronic expansion valve 831 until the pressure is balanced. The other part of the high-pressure liquid refrigerant is throttled through the first electronic expansion valve 811 and flows to the outdoor heat exchanger 40 for evaporation to obtain low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant flows back to the compressor 10 through the second valve port 22, the fourth valve port 24, and the gas-liquid separator 90.

[0065] In hot water mode, this triple-heat pump system with total heat recovery can meet the user's domestic hot water needs. Furthermore, in hot water mode, the third electronic expansion valve 831 is fully open, requiring only the first electronic expansion valve 811, located after the second distributor 72, to remain open for throttling control of the circulation loop, preventing excessive throttling. Simultaneously, this also places the indoor heat exchanger 60 at the high-pressure end of the circulation loop, preventing problems such as freezing and cracking caused by the indoor heat exchanger 60 being at the low-pressure end.

[0066] Please see Figure 5When the triple-heat pump system with total heat recovery is in cooling heat recovery mode, the first solenoid valve 84 is closed, and the high-pressure refrigerant discharged by the compressor 10 enters the circulation loop through the three-way valve 30. At this time, the first electronic expansion valve 811 is fully open, the third electronic expansion valve 831 is open, and the second solenoid valve 821 is closed; the fifth valve port 31 and the sixth valve port 32 are connected, the third valve port 23 and the fourth valve port 24 are connected, the heat recovery heat exchanger 50 acts as a condenser, the indoor heat exchanger 60 acts as an evaporator, and the idle outdoor heat exchanger 40 acts as a high-pressure liquid storage tank.

[0067] In the cooling and heat recovery mode, the refrigerant of the triple-heat pump system with total heat recovery sequentially passes through the compressor 10, the fifth valve port 31, and the sixth valve port 32. Then, it enters the heat recovery heat exchanger 50 through the second one-way valve 822 to condense into high-pressure liquid refrigerant, which flows to the second distributor 72 for diversion. Part of the high-pressure liquid refrigerant is injected into the outdoor heat exchanger 40 through the first electronic expansion valve 811 until the pressure is balanced. The other part of the high-pressure liquid refrigerant flows to the indoor heat exchanger 60 after being throttled by the third electronic expansion valve 831 to evaporate and obtain low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant flows back to the compressor 10 through the third valve port 23, the fourth valve port 24, and the gas-liquid separator 90.

[0068] In cooling and heat recovery mode, this triple-heat pump system with total heat recovery can meet the user's cooling and domestic hot water needs. Furthermore, in cooling and heat recovery mode, the first electronic expansion valve 811 is fully open, requiring only the third electronic expansion valve 831, located after the second distributor 72, to remain open for throttling control of the circulation loop, avoiding excessive throttling. Simultaneously, this also places the outdoor heat exchanger 40 at the high-pressure end of the circulation loop, preventing problems such as freezing and cracking caused by the outdoor heat exchanger 40 being at the low-pressure end.

[0069] The defrosting modes of the triple-heat pump system with total heat recovery provided in this application embodiment include a first defrosting mode based on the heat recovery heat exchanger 50 and a second defrosting mode based on the indoor heat exchanger 60.

[0070] Please see Figure 6 When the triple-heat pump system with total heat recovery is in the first defrost mode, the three-way valve 30 is de-energized, the first solenoid valve 84 opens, and the high-pressure refrigerant discharged by the compressor 10 enters the circulation loop via the four-way valve 20. At this time, the first electronic expansion valve 811 is closed, the third electronic expansion valve 831 is closed, and the second solenoid valve 821 is open; the first valve interface 21 and the second valve interface 22 are connected, and the sixth valve interface 32 and the seventh valve interface 33 are connected.

[0071] In the first defrost mode, the refrigerant of the triple heat pump system with total heat recovery passes sequentially through the compressor 10, the first valve port 21, and the second valve port 22, and then enters the outdoor heat exchanger 40 for defrosting. It then flows through the first one-way valve 812 to the second distributor 72, and then sequentially through the heat recovery heat exchanger 50, the second solenoid valve 821, the sixth valve port 32, the seventh valve port 33, and the gas-liquid separator 90 back to the compressor 10.

[0072] Please see Figure 3 When the triple-heat pump system with total heat recovery is in the second defrost mode, the three-way valve 30 is de-energized, the first solenoid valve 84 opens, and the high-pressure refrigerant discharged by the compressor 10 enters the circulation loop via the four-way valve 20. At this time, the first electronic expansion valve 811 is closed, the third electronic expansion valve 831 is fully open, the second solenoid valve 821 is closed; the first valve port 21 and the second valve port 22 are connected, and the third valve port 23 and the fourth valve port 24 are connected.

[0073] In the second defrost mode, the refrigerant of the triple heat pump system with total heat recovery passes sequentially through the compressor 10, the first valve port 21, and the second valve port 22, and then enters the outdoor heat exchanger 40 for defrosting. It then flows through the first one-way valve 812 to the second distributor 72 for diversion. Part of it is injected into the heat recovery heat exchanger 50, and the other part flows sequentially through the third electronic expansion valve 831, the indoor heat exchanger 60, the third valve port 23, the fourth valve port 24, and the gas-liquid separator 90 back to the compressor 10.

[0074] Understandably, in the first defrost mode based on the heat recovery heat exchanger 50, the indoor heat exchanger 60 is an idle heat exchanger; in the second defrost mode based on the indoor heat exchanger 60, the heat recovery heat exchanger 50 is an idle heat exchanger. When the indoor heat exchanger 60 or the heat recovery heat exchanger 50 malfunctions or is not connected to a load, the heat pump system can still operate the defrost function normally, thus improving the stability of the system operation.

[0075] Compared with the prior art, the beneficial effects of the embodiments of this application are as follows:

[0076] (1) The refrigerant flow direction is controlled by a combination of a three-way valve and a four-way valve. There is no cross-flow or diversion, which makes it more flexible and can cover a variety of working conditions.

[0077] (2) The idle heat exchanger is set at the high pressure end as a liquid storage tank to avoid adding a pressure vessel, and the efficiency and speed of hot water production are faster when switching from cooling mode to hot water mode, cooling heat recovery mode and heating mode to hot water mode.

[0078] (3) The heat recovery heat exchanger and the indoor heat exchanger can form a loop with the outdoor heat exchanger for defrosting, thereby improving the stability of the system;

[0079] (4) The parallel connection of one-way valve and electronic expansion valve makes the flow control more stable and allows for reasonable adjustment of the number of electronic expansion valves connected to the refrigerant flow path, thus avoiding excessive throttling.

[0080] (5) The heat pump system recovers all heat and can provide free cooling when operating heating / hot water.

[0081] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and the present invention also intends to include these modifications and variations.

Claims

1. A triple generation heat pump system with total heat recovery, characterized in that, Comprise: Compressor, four-way valve, three-way valve, indoor heat exchanger, outdoor heat exchanger, heat recovery heat exchanger, first shunt, second shunt and third shunt; The end of each channel of the first shunt is respectively provided with a first main line, a second main line and a third main line; the other end of the first main line is connected to the exhaust port of the compressor; The other end of the second main line is connected to the four-way valve; the other end of the third main line is connected to the three-way valve; The second main line is also provided with a first electromagnetic valve; The end of each channel of the second shunt is respectively provided with a first flow path, a second flow path and a third flow path; the other end of the first flow path is connected to a valve interface of the four-way valve, and the outdoor heat exchanger is arranged on the first flow path; the other end of the second flow path is connected to the three-way valve, and the heat recovery heat exchanger is arranged on the second flow path; the other end of the third flow path is connected to another valve interface of the four-way valve, and the indoor heat exchanger is arranged on the third flow path; The first flow path is also provided with a first valve assembly between the outdoor heat exchanger and the second shunt, for controlling the flow direction and flow rate of the refrigerant in the first flow path; the first valve assembly comprises a first electronic expansion valve and a first check valve arranged in parallel, and the flow direction of the first check valve is towards the second shunt; The second flow path is also provided with a second valve assembly between the heat recovery heat exchanger and the three-way valve, for controlling the flow direction and flow rate of the refrigerant in the second flow path; the second valve assembly comprises a second electromagnetic valve and a second check valve arranged in parallel, and the flow directions of the second electromagnetic valve and the second check valve are opposite; The third flow path is also provided with a third valve assembly between the indoor heat exchanger and the second shunt, for controlling the flow direction and flow rate of the refrigerant in the third flow path; the third valve assembly comprises a third electronic expansion valve and a third check valve arranged in parallel, and the flow direction of the third check valve is towards the second shunt; The end of each channel of the third shunt is respectively provided with a first return gas branch, a second return gas branch and a third return gas branch; the other end of the third return gas branch is in communication with the return gas port of the compressor; The four-way valve comprises a first valve interface, a second valve interface, a third valve interface and a fourth valve interface; the first valve interface is connected to the first electromagnetic valve; the second valve interface is in communication with the outdoor heat exchanger; the third valve interface is in communication with the indoor heat exchanger; the fourth valve interface is in communication with the first return gas branch; The three-way valve comprises a fourth valve interface, a fifth valve interface and a sixth valve interface; the fifth valve interface is in communication with the first shunt; the sixth valve interface is connected to the second valve assembly; the seventh valve interface is in communication with the second return gas branch.

2. The triple generation heat pump system with total heat recovery according to claim 1, characterized in that, Also include: Gas-liquid separator, arranged between the third shunt and the compressor, its air inlet end is in communication with the third return gas branch, and its air outlet end is in communication with the exhaust port of the compressor.

3. The triple generation heat pump system with total heat recovery according to claim 1, characterized in that: The three-union heat pump system with full heat recovery comprises a heating mode; When the three-way valve is powered off, the first electromagnetic valve is opened, the first electronic expansion valve is opened, the third electronic expansion valve is closed, and the second electromagnetic valve is closed, the three-union heat pump system with full heat recovery is in the heating mode; the refrigerant in the three-union heat pump system with full heat recovery in the heating mode sequentially passes through the compressor, the first valve interface, the third valve interface, the indoor heat exchanger, the third check valve, is branched by the second flow divider, one part is injected into the heat recovery heat exchanger, and the other part flows through the outdoor heat exchanger, the second valve interface, and finally returns to the compressor by the fourth valve interface after throttling by the first electronic expansion valve.

4. The triple generation heat pump system with total heat recovery according to claim 1, characterized in that: The three-union heat pump system with full heat recovery further comprises a refrigeration mode; When the three-way valve is powered off, the first electromagnetic valve is opened, the first electronic expansion valve is closed, the third electronic expansion valve is opened, and the second electromagnetic valve is closed, the three-union heat pump system with full heat recovery is in the refrigeration mode; the refrigerant in the three-union heat pump system with full heat recovery in the refrigeration mode sequentially passes through the compressor, the first electromagnetic valve, the first valve interface, the second valve interface, the first check valve, is branched by the second flow divider, one part is injected into the heat recovery heat exchanger, and the other part flows through the indoor heat exchanger, the third valve interface, and finally returns to the compressor by the fourth valve interface after throttling by the third electronic expansion valve.

5. The triple generation heat pump system with total heat recovery according to claim 1, characterized in that: The three-union heat pump system with full heat recovery further comprises a hot water mode; When the first electromagnetic valve is closed, the three-way valve is powered on, the second electromagnetic valve is closed, the first electronic expansion valve is opened, and the third electronic expansion valve is opened, the three-union heat pump system with full heat recovery is in the hot water mode; the refrigerant in the three-union heat pump system with full heat recovery in the hot water mode sequentially passes through the compressor, the fifth valve interface, the sixth valve interface, the second check valve, the heat recovery heat exchanger, and then is branched by the second flow divider, one part is injected into the indoor heat exchanger by the third electronic expansion valve, and the other part flows through the outdoor heat exchanger, the second valve interface, and finally returns to the compressor by the fourth valve interface after throttling by the first electronic expansion valve.

6. The triple generation heat pump system with total heat recovery according to claim 1, characterized in that: The three-union heat pump system with full heat recovery further comprises a refrigeration heat recovery mode; When the triple supply heat pump system with total heat recovery is in the refrigeration heat recovery mode, the first electromagnetic valve is closed, the three-way valve is powered on, the second electromagnetic valve is closed, the first electronic expansion valve is opened, and the third electronic expansion valve is opened; the refrigerant of the triple supply heat pump system with total heat recovery in the refrigeration heat recovery mode sequentially passes through the compressor, the fifth valve interface, the sixth valve interface, the second check valve, the heat recovery heat exchanger, and then is divided by the second flow divider, one part is injected into the outdoor heat exchanger through the first electronic expansion valve, and the other part flows through the indoor heat exchanger, the third valve interface, and finally returns to the compressor through the fourth valve interface after being throttled by the third electronic expansion valve.

7. The triple generation heat pump system with total heat recovery according to claim 1, characterized in that: The triple supply heat pump system with total heat recovery further comprises a defrosting mode; the defrosting mode comprises a first defrosting mode based on the heat recovery heat exchanger and a second defrosting mode based on the indoor heat exchanger.

8. The triple supply heat pump system with total heat recovery according to claim 1, characterized in that: When the triple supply heat pump system with total heat recovery is in the first defrosting mode, the three-way valve is powered off, the first electromagnetic valve is opened, the second electromagnetic valve is opened, the first electronic expansion valve is closed, and the third electronic expansion valve is closed; the refrigerant of the triple supply heat pump system with total heat recovery in the first defrosting mode sequentially passes through the compressor, the first valve interface, the second valve interface, the outdoor heat exchanger, the first check valve, the heat recovery heat exchanger, the sixth valve interface, and the seventh valve interface to return to the compressor; When the triple supply heat pump system with total heat recovery is in the second defrosting mode, the three-way valve is powered off, the first electromagnetic valve is opened, the third electronic expansion valve is in a fully open state, the first electronic expansion valve is closed, and the second electromagnetic valve is closed; the refrigerant of the triple supply heat pump system with total heat recovery in the second defrosting mode sequentially passes through the compressor, the first electromagnetic valve, the first valve interface, the second valve interface, and the first check valve, is divided by the second flow divider, one part is injected into the heat recovery heat exchanger, and the other part flows through the indoor heat exchanger, the third valve interface, and finally returns to the compressor through the fourth valve interface after passing through the third electronic expansion valve.

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