Heat pump system and four-way valve

Abstract

The present application provides a heat pump system and a four-way valve, wherein the heat pump system includes a compressor, a first flow path, a second flow path, a third flow path and a four-way valve. The heat pump system has a full cooling and partial heating mode or a full heating and partial cooling mode. When the heat pump system is in a full cooling and partial heating mode, the flow rate of the fluid flowing through the first flow path and the third flow path can be adjusted by adjusting the four-way valve. When the heat pump system is in a full heating and partial cooling mode, the flow rate of the fluid flowing through the second flow path and the third flow path can be adjusted by adjusting the four-way valve. When the heat pump system of the present application is in a full cooling and partial heating mode, the heating amount can be adjusted, and when the heat pump system is in a full heating and partial cooling mode, the cooling capacity can be adjusted.

Description

Technical Field

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

[0002] The heat pump system includes a compressor, two heat exchangers, a valve device and a four-way valve, which can provide users with air conditioning cooling and air conditioning heating. However, this heat pump system has few working modes. Therefore, a heat pump system is needed that can provide users with air conditioning cooling, air conditioning heating, hot water heating, and multiple working modes including providing users with air conditioning cooling and hot water heating. Summary of the invention

[0003] In order to achieve the above-mentioned object, the present application provides a heat pump system, including a compressor, a first flow path, a second flow path, a third flow path, a first heat exchanger, a second heat exchanger, a third heat exchanger and a four-way valve. The compressor includes an air intake port and an air exhaust port. The first flow path has a first end and a second end. The second flow path has a first end and a second end. The third flow path has a first end and a second end. The first heat exchanger is arranged in the first flow path. The second heat exchanger is arranged in the second flow path. The third heat exchanger is arranged in the third flow path. The four-way valve has four communication ports. Among them, the second end of the first flow path, the second end of the second flow path and the second end of the third flow path are connected to a common path intersection point, the first end of the second flow path is connected to the air intake port, the first end of the first flow path, the exhaust port, the air intake port and the first end of the third flow path are respectively connected to the four communication ports, and the first end of the first flow path, the exhaust port, the air intake port and the first end of the third flow path can be controllably connected through the four-way valve. Wherein, the heat pump system has at least one of a full cooling and partial heating mode and a full heating and partial cooling mode. When the heat pump system is in the full cooling and partial heating mode, the exhaust port can be communicated with the first end of the first flow path and the first end of the third flow path through the four-way valve, and the heat pump system is configured to be able to adjust the flow rate of the fluid flowing through the first flow path and the third flow path by adjusting the four-way valve. When the heat pump system is in the full heating and partial cooling mode, the exhaust port can be communicated with the first end of the first flow path through the four-way valve, the first end of the third flow path can be communicated with the suction port through the four-way valve, and the heat pump system is configured to be able to adjust the flow rate of the fluid flowing through the second flow path and the third flow path by adjusting the four-way valve.

[0004] According to the above heat pump system, when the heat pump system is in the full cooling and partial heating mode, the sum of the flow rates of the fluid flowing through the first flow path and the third flow path is equal to the flow rate of the fluid flowing through the second flow path.

[0005] According to the above heat pump system, when the heat pump system is in the full heating and partial cooling mode, the sum of the flow rates of the fluid flowing through the second flow path and the third flow path is equal to the flow rate of the fluid flowing through the first flow path.

[0006] According to the above-mentioned heat pump system, the heat pump system has a cooling mode. When the heat pump system is in the cooling mode, the exhaust port is connected to the first end of the third flow path through the four-way valve, and the intake port is disconnected from the first end of the first flow path through the four-way valve.

[0007] According to the above-mentioned heat pump system, the heat pump system also has a heating mode. When the heat pump system is in the heating mode, the exhaust port is connected to the first end of the first flow path through the four-way valve, and the intake port is connected to the first end of the third flow path through the four-way valve.

[0008] According to the above-mentioned heat pump system, the heat pump system also has a complete cooling and complete heating mode. When the heat pump system is in the complete cooling and complete heating mode, the exhaust port is connected to the first end of the first flow path through the four-way valve, and the intake port is disconnected from the first end of the third flow path through the four-way valve.

[0009] According to the above heat pump system, the heat pump system also has a defrost mode. When the heat pump system is in the defrost mode, the exhaust port is connected to the first end of the third flow path through the four-way valve, and the first end of the first flow path is connected to the intake port.

[0010] According to the above heat pump system, the heat pump system further includes a first valve device, a second valve device and a third valve device. The first valve device is arranged in the first flow path, and the first valve device includes a first valve device inlet and a first valve device outlet. The second valve device is arranged in the second flow path, and the second valve device includes a second valve device inlet and a second valve device outlet. The third valve device is arranged in the third flow path, and the third valve device includes a third valve device inlet and a third valve device outlet. Wherein, the first valve device inlet, the second valve device inlet and the third valve device inlet are connected to the path intersection.

[0011] According to the above heat pump system, the heat pump system further includes a first bypass, a third bypass, and a first check valve and a third check valve respectively arranged in the first bypass and the third bypass. The first end of the first bypass is connected to the outlet of the first valve device, the first end of the third bypass is connected to the outlet of the third valve device, and the second end of the first bypass and the second end of the third bypass are connected to a common bypass junction to controllably bypass the first valve device and the third valve device, respectively, so that the first heat exchanger and the third heat exchanger can be respectively connected to the bypass junction fluid.

[0012] The present application also provides a four-way valve, the four-way valve comprising a housing and a valve body, the valve body being arranged in the housing. The valve body has a central axis and can move relative to the housing around the central axis, and the valve body is provided with a first channel cavity and a second channel cavity which are independent of each other. The housing is provided with a first communication port, a second communication port, a third communication port and a fourth communication port. The fourth communication port can be connected to at least one of the first communication port, the second communication port and the third communication port through the second channel cavity.

[0013] According to the above four-way valve, the housing is cylindrical, the first communication port, the second communication port and the third communication port are arranged on the housing along the circumferential direction, and the fourth communication port is arranged along the central axis.

[0014] According to the above-mentioned four-way valve, the valve body can rotate relative to the housing so that the four-way valve has a first state, a second state, a third state, a fourth state and a fifth state, and the four-way valve is configured as follows: when the four-way valve is in the first state, the first communication port is communicated with the fourth communication port through the second channel chamber, and the second communication port is disconnected from the third communication port; when the four-way valve is in the second state, the first communication port is communicated with the second communication port through the first channel chamber, and the third communication port is communicated with the fourth communication port through the second channel chamber; when the four-way valve is in the third state, the first communication port, the third communication port and the fourth communication port are communicated with each other through the second channel chamber, and the second communication port is disconnected; when the four-way valve is in the fourth state, the third communication port is communicated with the fourth communication port through the second channel chamber, and the first communication port is disconnected from the second communication port; and when the four-way valve is in the fifth state, the first communication port is communicated with the fourth communication port through the second channel chamber, and the second communication port is communicated with the third communication port through the first channel chamber.

[0015] According to the above four-way valve, the four-way valve is configured such that: when the four-way valve is in the second state, the valve body can rotate between the second state first position and the second state second position, and during the rotation process between the second state first position and the second state second position, the value range of the opening of the first communication port and / or the second communication port is: .

[0016] According to the above four-way valve, the opening degree of the first communication port is related to the overlapping area between the valve body and the first communication port.

[0017] According to the above-mentioned four-way valve, the four-way valve is configured as follows: when the four-way valve is in the third state, the valve body is able to rotate between the third state first position and the third state second position, and during the rotation process between the third state first position and the third state second position, it is achieved that: when the opening of the first connecting port increases, the opening of the third connecting port decreases; and when the opening of the first connecting port decreases, the opening of the third connecting port increases.

[0018] According to the above four-way valve, the opening degree of the first communication port is related to the overlapping area between the valve body and the first communication port, and the opening degree of the third communication port is related to the overlapping area between the valve body and the third communication port.

[0019] When the heat pump system of the present application is in a full cooling and partial heating mode, the heating capacity can be adjusted, and when the heat pump system is in a full heating and partial cooling mode, the cooling capacity can be adjusted.

[0020] By considering the following specific embodiments and the accompanying drawings, other features, advantages and embodiments of the present application can be set forth or become apparent. In addition, it should be understood that the above-mentioned invention content and the following specific embodiments are exemplary, and are intended to provide further explanations, without limiting the scope of the present application for protection. However, the specific embodiments and specific examples only indicate the preferred embodiments of the present application. For those skilled in the art, various changes and modifications within the spirit and scope of the present application will become apparent through the specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features and advantages of the present application may be better understood by reading the following detailed description with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout, wherein:

[0022] Figure 1 is a system diagram of the heat pump system of the present application;

[0023] Figure 2 for Figure 1The schematic diagram of communication connection between the control device and various components in the heat pump system shown;

[0024] Figure 3 yes Figure 2 A schematic diagram of the internal structure of the control device;

[0025] Figure 4A-4E A schematic diagram showing five kinds of connection relationships of a four-way valve;

[0026] Figure 5 yes Figure 1 The system diagram of the heat pump system shown in cooling mode;

[0027] Figure 6 yes Figure 1 The system diagram of the heat pump system in heating mode is shown;

[0028] Figure 7A-7B yes Figure 1 The heat pump system shown is in full heating and partial cooling mode;

[0029] Figure 8 yes Figure 1 The heat pump system shown is in full cooling and partial heating mode;

[0030] Fig. 9 yes Figure 1 The heat pump system shown is in full heating and full cooling mode;

[0031] Fig.10 yes Figure 1 The system diagram of the heat pump system shown in the defrost mode;

[0032] Figures 11A-11C It is an exemplary embodiment of a four-way valve in the heat pump system of the present application. DETAILED DESCRIPTION

[0033] Various specific embodiments of the present invention will be described below with reference to the accompanying drawings which form part of this specification. It should be understood that ordinal numbers such as "first" and "second" used in this application are only used for distinction and identification, and do not have any other meanings, and do not indicate a specific order or have a specific association unless otherwise specified. For example, the term "first heat exchanger" itself does not imply the existence of a "second heat exchanger", and the term "second heat exchanger" itself does not imply the existence of a "first heat exchanger".

[0034] Figure 1 is a system diagram of the heat pump system of the present application, which shows the components and their connection relationships in the heat pump system. Figure 1As shown, the heat pump system includes a compressor 108, a first heat exchanger 101, a second heat exchanger 102, a third heat exchanger 103, a four-way valve 140, a first valve device 131, a second valve device 132, a third valve device 133, and several other valves to be introduced below. Figure 1 The connecting lines shown between the various components (including the compressor 108, the three heat exchangers, the four-way valve 140, the three valve devices, and the other various valves) represent connecting lines.

[0035] The heat pump system includes a first flow path, a second flow path and a third flow path. The first flow path, the second flow path and the third flow path are parallel paths. The first heat exchanger 101 and the first valve device 131 are arranged in series in the first flow path, the second heat exchanger 102 and the second valve device 132 are arranged in series in the second flow path, and the third heat exchanger 103 and the third valve device 133 are arranged in series in the third flow path. Specifically, the second flow port 114 of the first heat exchanger 101 is connected to the first valve device outlet of the first valve device 131, the second flow port 116 of the second heat exchanger 102 is connected to the second valve device outlet of the second valve device 132, and the second flow port 118 of the third heat exchanger 103 is connected to the third valve device outlet of the third valve device 133.

[0036] The first end of the first flow path (i.e., the first flow port 113 of the first heat exchanger 101) and the first end of the third flow path (i.e., the first flow port 117 of the third heat exchanger 103) are both connected to the four-way valve 140. The second ends of the first flow path, the second flow path, and the third flow path are connected to a common path intersection point A. Specifically, the four-way valve 140 includes four ports, namely, a first communication port 141, a second communication port 142, a third communication port 143, and a fourth communication port 144. The first communication port 141 is connected to the first end of the third flow path, the second communication port 142 and the first end of the second flow path (i.e., the first flow port 115 of the second heat exchanger 102) are both connected to the suction port 111 of the compressor 108, the third communication port 143 is connected to the first end of the first flow path, and the fourth communication port 144 is connected to the exhaust port 112 of the compressor 108. The first valve device inlet of the first valve device 131, the second valve device inlet of the second valve device 132 and the third valve device inlet of the third valve device 133 are connected to the path intersection point A. In the embodiment of the present application, the first valve device 131, the second valve device 132 and the third valve device 133 can be controlled to be opened or closed.

[0037] The four-way valve 140 includes a housing 152 and a valve body 154. The valve body 154 is disposed in the housing 152 and is rotatable relative to the housing 152. The first communication port 141, the second communication port 142, the third communication port 143, and the fourth communication port 144 are disposed on the housing 152. When the valve body 154 rotates relative to the housing 152, the valve body 154 blocks or releases the first communication port 141, the second communication port 142, and / or the third communication port 143, so that the four ports form different communication relationships. Different communication relationships will be combined Figure 4A-4E Specific description.

[0038] The heat pump system further includes a first bypass and a third bypass. The first end of the first bypass is connected between the second flow port 114 of the first heat exchanger 101 and the first valve device outlet of the first valve device 131, so that the first end of the first bypass is connected to the second flow port 114 of the first heat exchanger 101. The first end of the third bypass is connected between the second flow port 118 of the third heat exchanger 103 and the third valve device outlet of the third valve device 133, so that the first end of the third bypass is connected to the second flow port 118 of the third heat exchanger 103. The second ends of the first bypass and the third bypass are connected to a common bypass intersection B, so that the second flow port 114 of the first heat exchanger 101 and the second flow port 118 of the third heat exchanger 103 can be connected to the bypass intersection B through the first bypass and the third bypass, respectively.

[0039] The heat pump system further includes a throttling device 134. The throttling device 134 is disposed between the path junction A and the bypass junction B, and is used to throttle the fluid at the bypass junction B when it flows toward the path junction A.

[0040] The heat pump system further includes a first one-way valve 121 disposed in the first bypass and a third one-way valve 123 disposed in the third bypass, which are used to control the connection and disconnection of the first bypass and the third bypass, respectively. The first one-way valve 121 enables a fluid (e.g., a refrigerant) to flow from the second flow port 114 of the first heat exchanger 101 through the first bypass to the bypass junction B. The third one-way valve 123 enables a fluid (e.g., a refrigerant) to flow from the second flow port 118 of the third heat exchanger 103 through the third bypass to the bypass junction B.

[0041] Those skilled in the art will appreciate that, although the first one-way valve 121 and the third one-way valve 123 are both one-way valves in the present application, they may be provided as other types of valves in other embodiments, which can controllably connect or disconnect the upstream and downstream of the valves.

[0042] In an embodiment of the present application, the first heat exchanger 101 is a water-side heat exchanger. When it is used as a condenser, it can be used to provide heat to users (for example, to provide hot water for air conditioning and / or to provide domestic hot water). It can also be used as an evaporator in defrosting mode. The second heat exchanger 102 is a water-side heat exchanger. It can be used as an evaporator to provide cooling to users (for example, to provide cold water for air conditioning). The third heat exchanger 103 is an air-side heat exchanger. It includes a fan 104. It can be used as a condenser / evaporator to dissipate heat / cooling to the outside.

[0043] Those skilled in the art will appreciate that the types of the first heat exchanger 101, the second heat exchanger 102, and the third heat exchanger 103 are only illustrative, and in other examples, the first heat exchanger 101, the second heat exchanger 102, and the third heat exchanger 103 may be heat exchangers of any form. For example, the third heat exchanger 103 may be a ground source heat exchanger, a water source heat exchanger, and the like.

[0044] Figure 2 for Figure 1 The heat pump system shown in FIG. 1 is a schematic diagram of the communication connection between the control device 202 and each component. Figure 2 As shown, the heat pump system further includes a control device 202. The control device 202 is respectively connected to the compressor 108, the four-way valve 140, the first valve device 131, the second valve device 132, the third valve device 133 and the fan 104 through connections 274, 275, 276, 277, 278, 279. The control device 202 can control the opening and closing of the compressor 108, the state of the four-way valve 140 (for example, the first state, the second state, the third state, the fourth state and the fifth state), the opening and closing of the first valve device 131, the second valve device 132 and the third valve device 133, and the opening and closing of the fan 104.

[0045] Figure 3 yes Figure 2 Schematic diagram of the internal structure of the control device 202. Figure 3As shown, the control device 202 includes a bus 302, a processor 304, an input interface 308, an output interface 312, and a memory 318 having a control program. Each component in the control device 202, including the processor 304, the input interface 308, the output interface 312, and the memory 318, is communicatively connected to the bus 302, so that the processor 304 can control the operation of the input interface 308, the output interface 312, and the memory 318. Specifically, the memory 318 is used to store programs, instructions, and data, and the processor 304 reads programs, instructions, and data from the memory 318, and can write data to the memory 318. By executing the programs and instructions read from the memory 318, the processor 304 controls the operation of the input interface 308 and the output interface 312. Figure 3 As shown, the output interface 312 is connected to the compressor 108, the four-way valve 140, the first valve device 131, the second valve device 132, the third valve device 133 and the fan 104 through the connection 274, 275, 276, 277, 278, 279 respectively. The input interface 308 receives the operation request and other operation parameters of the heat pump system through the connection 309. By executing the program and instructions in the memory 318, the processor 304 controls the operation of the heat pump system. More specifically, the control device 202 can receive the operation request of the heat pump system (such as sending a request through the control panel) through the input interface 308, and send a control signal to each controlled component through the output interface 312, so that the heat pump system can operate in multiple working modes and can switch between each working mode.

[0046] The heat pump system of the present application realizes multiple working modes by specifically controlling the four-way valve 140, the first valve device 131, the second valve device 132, the third valve device 133 and the fan 104. The connection relationship of each component in the heat pump system of the present application is simple, and the control logic is simple.

[0047] Figure 4A-4EA schematic diagram of five communication relationships of the four-way valve 140 is shown, so that different communication relationships of the four ports are realized through different position states of the valve body 154 of the four-way valve 140. Specifically, the heat pump system has six modes, namely: cooling mode, heating mode, complete heating and partial cooling mode, complete cooling and partial heating mode, complete heating and complete cooling mode, and defrosting mode. The valve body 154 of the four-way valve 140 can rotate relative to the housing 152, so that the valve body 154 can have five states (i.e., the first state, the second state, the third state, the fourth state and the fifth state) relative to the housing 152, thereby realizing six modes of the heat pump system. Specifically, when the valve body 154 is in the first state, the first communication port 141 is connected to the fourth communication port 144, and the second communication port 142 and the third communication port 143 are disconnected. The heat pump system can realize the cooling mode. When the valve body 154 is in the second state, the first communication port 141 and the second communication port 142 are connected, and the third communication port 143 and the fourth communication port 144 are connected, and the heat pump system can realize the heating mode and the complete heating and partial cooling mode. When the valve body 154 is in the third state, the first communication port 141, the third communication port 143 and the fourth communication port 144 are connected, and the second communication port 142 is disconnected, and the heat pump system can realize the complete cooling and partial heating mode. When the valve body 154 is in the fourth state, the third communication port 143 and the fourth communication port 144 are connected, and the first communication port 141 and the second communication port 142 are disconnected, and the heat pump system can realize the complete cooling and complete heating mode. When the valve body 154 is in the fifth state, the first communication port 141 and the fourth communication port 144 are connected, and the second communication port 142 and the third communication port 143 are connected, and the heat pump system can realize the defrosting mode.

[0048] Figure 5-Figure 10 yes Figure 1 The system diagram of the heat pump system shown in FIG. 1 is used to illustrate the refrigerant circulation circuit when the heat pump system is running in different working modes, wherein the arrows indicate the flow direction and flow path of the refrigerant. Figure 5-Figure 10 The various operating modes shown:

[0049] Figure 5 yes Figure 1 The heat pump system in cooling mode is shown in the figure. Figure 5 As shown, through the control of the control device 202, the four-way valve 140 is in the first state, the second valve device 132 is opened, the first valve device 131 and the third valve device 133 are closed, and the fan 104 is turned on.

[0050] Specifically, the high-temperature and high-pressure gaseous refrigerant flowing out of the exhaust port 112 of the compressor 108 flows to the third heat exchanger 103 through the fourth connecting port 144 and the first connecting port 141 of the four-way valve 140 in sequence. In the third heat exchanger 103, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the air, thereby converting the high-temperature and high-pressure gaseous refrigerant into a high-pressure liquid refrigerant. After flowing out of the third heat exchanger 103, the high-pressure liquid refrigerant passes through the third one-way valve 123 and the throttling device 134 in sequence. After the high-pressure liquid refrigerant flows through the throttling device 134, it becomes a low-temperature and low-pressure refrigerant, and then flows to the second heat exchanger 102 through the second valve device 132. In the second heat exchanger 102, the low-temperature and low-pressure refrigerant exchanges heat with the fluid with a higher temperature on the user side, thereby reducing the temperature of the fluid on the user side to provide the user side with a lower temperature fluid (i.e., provide cooling). After the low-temperature and low-pressure refrigerant exchanges heat with the user side fluid in the second heat exchanger 102, it becomes a low-pressure gaseous refrigerant. After flowing out of the second heat exchanger 102, the low-pressure gaseous refrigerant enters the compressor 108 again from the air intake port 111 of the compressor 108 to become a high-temperature and high-pressure gaseous refrigerant, thereby completing the refrigerant cycle.

[0051] Thus, when the heat pump system is in cooling mode, the compressor 108, the third heat exchanger 103, the second valve device 132 and the second heat exchanger 102 are connected in the refrigerant loop. The third heat exchanger 103 acts as a condenser and the second heat exchanger 102 acts as an evaporator. The first heat exchanger 101 is not in the refrigerant circulation loop.

[0052] When the heat pump system is in the cooling mode, the cooling capacity provided by the second heat exchanger 102 may be adjusted by adjusting the compressor 108 (eg, adjusting the frequency of the compressor 108 ).

[0053] Figure 6 yes Figure 1 The heat pump system in heating mode is shown in the figure. Figure 6 As shown, through the control of the control device 202, the four-way valve 140 is in the second state, the third valve device 133 is opened, the first valve device 131 and the second valve device 132 are closed, and the fan 104 is turned on.

[0054] Specifically, the high-temperature and high-pressure gaseous refrigerant flowing out of the exhaust port 112 of the compressor 108 flows to the first heat exchanger 101 through the fourth communication port 144 and the third communication port 143 of the four-way valve 140 in sequence. In the first heat exchanger 101, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the fluid with a lower temperature on the user side, thereby increasing the temperature of the fluid on the user side to provide the user with a fluid with a higher temperature (i.e., providing heat). The high-temperature and high-pressure gaseous refrigerant changes into a high-pressure liquid refrigerant after exchanging heat with the user side fluid in the first heat exchanger 101. After flowing out of the first heat exchanger 101, the high-pressure liquid refrigerant passes through the first check valve 121 and the throttling device 134 in sequence. After the high-pressure liquid refrigerant flows through the throttling device 134, it becomes a low-temperature and low-pressure refrigerant, and then flows to the third heat exchanger 103 through the third valve device 133. In the third heat exchanger 103, the low-temperature and low-pressure refrigerant exchanges heat with the air, thereby changing the low-temperature and low-pressure refrigerant into a low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant passes through the first connecting port 141 and the second connecting port 142 of the four-way valve 140 in sequence and then enters the compressor 108 again from the air intake port 111 of the compressor 108 to become a high-temperature and high-pressure gaseous refrigerant to complete the refrigerant cycle.

[0055] Thus, when the heat pump system is in heating mode, the compressor 108, the first heat exchanger 101, the third valve device 133 and the third heat exchanger 103 are connected in the refrigerant loop. The first heat exchanger 101 acts as a condenser and the third heat exchanger 103 acts as an evaporator. The second heat exchanger 102 is not in the refrigerant circulation loop.

[0056] When the heat pump system is in the heating mode, the heat provided by the first heat exchanger 101 may be adjusted by adjusting the compressor 108 (eg, adjusting the frequency of the compressor 108 ).

[0057] Figure 7A-7B yes Figure 1 The system diagram of the heat pump system in full heating and partial cooling mode is shown, where Fig. 7A The first adjustment method of the valve body 154 for achieving full heating and partial cooling mode is shown. Figure 7B FIG. 2 shows a second adjustment method of the valve body 154 for achieving full heating and partial cooling modes. Figure 7A-7B As shown, through the control of the control device 202, the four-way valve 140 is in the second state, the second valve device 132 and the third valve device 133 are opened, the first valve device 131 is closed, and the fan 104 is turned on.

[0058] Specifically, the high-temperature and high-pressure gaseous refrigerant flowing out of the exhaust port 112 of the compressor 108 flows to the first heat exchanger 101 through the fourth connecting port 144 and the third connecting port 143 of the four-way valve 140 in sequence. In the first heat exchanger 101, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the fluid with a lower temperature on the user side, thereby raising the temperature of the fluid on the user side to provide the user with a fluid with a higher temperature (i.e., providing heat). The high-temperature and high-pressure gaseous refrigerant becomes a high-pressure liquid refrigerant after exchanging heat with the user side fluid in the first heat exchanger 101. After flowing out of the first heat exchanger 101, the high-pressure liquid refrigerant flows to the throttling device 134 through the first one-way valve 121. The high-pressure liquid refrigerant becomes a low-temperature and low-pressure refrigerant through the throttling device 134, and then is divided into two paths at the path intersection A. The first path of low-temperature and low-pressure refrigerant flows to the second heat exchanger 102. In the second heat exchanger 102, the low-temperature, low-pressure refrigerant exchanges heat with the fluid with a higher temperature on the user side, thereby reducing the temperature of the fluid on the user side to provide the user with a fluid with a lower temperature (i.e., providing cooling capacity). The low-temperature, low-pressure refrigerant changes into a low-pressure gaseous refrigerant after exchanging heat with the fluid on the user side in the second heat exchanger 102. The second low-temperature, low-pressure refrigerant flows to the third heat exchanger 103. In the third heat exchanger 103, the low-temperature, low-pressure refrigerant exchanges heat with the air, thereby changing the low-temperature, low-pressure refrigerant into a low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant passes through the first connecting port 141 and the second connecting port 142 of the four-way valve 140 in sequence, and then merges with the low-pressure gaseous refrigerant flowing out of the second heat exchanger 102, and then enters the compressor 108 from the air intake port 111 of the compressor 108 again, becoming a high-temperature, high-pressure gaseous refrigerant to complete the refrigerant cycle.

[0059] When the heat pump system is in the full heating and partial cooling mode, the heat provided by the first heat exchanger 101 and the coldness provided by the second heat exchanger 102 can be adjusted simultaneously by adjusting the compressor 108 (for example, adjusting the frequency of the compressor 108). In addition, when the heat pump system is in the full heating and partial cooling mode, the coldness provided by the second heat exchanger 102 can be adjusted separately by adjusting the four-way valve 140 without changing the heat provided by the first heat exchanger 101. Specifically, when the heat pump system is in the full heating and partial cooling mode, the second flow path and the third flow path are in parallel, and the flow rate of the fluid flowing through the first flow path (i.e., the first heat exchanger 101) is equal to the sum of the flow rates of the fluids flowing through the second flow path (i.e., the second heat exchanger 102) and the third flow path (i.e., the third heat exchanger 103). Therefore, when the flow rate of the fluid flowing out of the compressor 108 remains unchanged, the flow rate of the fluid flowing through the third flow path (i.e., the third heat exchanger 103) can be adjusted by adjusting the opening of the first connecting port 141 and / or the second connecting port 142 of the four-way valve 140, thereby changing the flow rate of the fluid flowing through the second flow path (i.e., the second heat exchanger 102).

[0060] Reference below Figure 6 and Figure 7A-7B The second state of the four-way valve 140 is described in detail. Fig. 7A The first adjustment method of the valve body 154 for achieving the full heating and partial cooling modes is described below. Specifically, when the four-way valve 140 is in the second state, the valve body 154 can rotate between the first position of the second state and the second position of the second state, and during the unidirectional rotation process between the first position of the second state and the second position of the second state, the value range of the opening of the first communication port 141 is: , and gradually increases, and the opening of the second communication port 142 remains 100%. For example, when the valve body 154 is in the second state first position, the opening of the first communication port 141 is close to 0%, and when the valve body 154 is in the second state second position, the opening of the first communication port 141 is 100%. In the present application, for example, when the heat pump system is in such a state Figure 6 In the heating mode shown in FIG. 1 , the valve body 154 is located in the second state and the second position, and the opening degree of the first communication port 141 is 100%. Fig. 7A In the full heating and partial cooling mode shown in FIG. 1 , the valve body 154 can be in any position between the first position in the second state and the second position in the second state, or stay in the second position in the second state, and the opening degree of the first communication port 141 is .

[0061] Similarly, reference Figure 7B The second adjustment method of the valve body 154 for achieving the full heating and partial cooling modes is described below. Specifically, when the four-way valve 140 is in the second state, the valve body 154 can rotate between the second state first position and the second state second position, and during the unidirectional rotation process between the second state first position and the second state second position, the value range of the opening of the second communication port 142 is: , and gradually increases, and the opening of the first communication port 141 remains 100%. For example, when the valve body 154 is in the first position of the second state, the opening of the second communication port 142 is close to 0%, and when the valve body 154 is in the second position of the second state, the opening of the second communication port 142 is 100%. In the present application, for example, when the heat pump system is in a state such as Figure 6 In the heating mode shown in FIG. 1 , the valve body 154 is located in the second state and the second position, and the opening degree of the second communication port 142 is 100%. Figure 7B In the full heating and partial cooling mode shown in FIG. 1 , the valve body 154 can be in any position between the first position in the second state and the second position in the second state, or stay in the second position in the second state, and the opening degree of the second communication port 142 is .

[0062] Those skilled in the art can understand that, since the first communication port 141 and the second communication port 142 are in a series relationship when the heat pump system is in the full heating and partial cooling mode, the flow rate of the fluid flowing through the third flow path can be adjusted regardless of adjusting the opening of either the first communication port 141 or the second communication port 142. In addition, adjusting the first communication port 141 and the second communication port 142 together is also within the protection scope of the present application.

[0063] Figure 8 yes Figure 1 The heat pump system shown in the figure is in full cooling and partial heating mode. Figure 8 As shown, through the control of the control device 202, the four-way valve 140 is in the third state, the second valve device 132 is opened, the first valve device 131 and the third valve device 133 are closed, and the fan 104 is turned on.

[0064] Specifically, the high-temperature and high-pressure gaseous refrigerant flowing out of the exhaust port 112 of the compressor 108 is divided into two paths after passing through the fourth communication port 144 of the four-way valve 140. The first path of high-temperature and high-pressure gaseous refrigerant flows out of the third communication port 143 of the four-way valve 140 and flows to the first heat exchanger 101. In the first heat exchanger 101, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the fluid at the user side with a lower temperature, thereby increasing the temperature of the fluid at the user side to provide the user with a fluid at a higher temperature (i.e., provide heat). The high-temperature and high-pressure gaseous refrigerant is converted into a high-pressure liquid refrigerant after exchanging heat with the fluid at the user side in the first heat exchanger 101. After flowing out of the first heat exchanger 101, the high-pressure liquid refrigerant flows through the first one-way valve 121 to the path intersection point B. The second path of high-temperature and high-pressure gaseous refrigerant flows out of the first connecting port 141 of the four-way valve 140 and flows to the third heat exchanger 103. In the third heat exchanger 103, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the air, thereby converting the high-temperature and high-pressure gaseous refrigerant into a high-pressure liquid refrigerant. The high-pressure liquid refrigerant flows out of the third heat exchanger 103. After flowing out, it flows to the path intersection point B through the third one-way valve 123. The two refrigerants converge at the path intersection point B, and become low-temperature and low-pressure refrigerant after passing through the throttling device 134, and then flow to the second heat exchanger 102 through the second valve device 132. In the second heat exchanger 102, the low-temperature and low-pressure refrigerant exchanges heat with the fluid with a higher temperature on the user side, thereby reducing the temperature of the fluid on the user side to provide the user side with a lower temperature fluid (i.e., provide cooling capacity). The low-temperature and low-pressure refrigerant becomes a low-pressure gaseous refrigerant after exchanging heat with the user side fluid in the second heat exchanger 102. After flowing out of the second heat exchanger 102, the low-pressure gaseous refrigerant enters the compressor 108 again from the suction port 111 of the compressor 108, becoming a high-temperature and high-pressure gaseous refrigerant to complete the refrigerant cycle.

[0065] When the heat pump system is in a full cooling and partial heating mode, the heat provided by the first heat exchanger 101 and the coldness provided by the second heat exchanger 102 can be adjusted simultaneously by adjusting the compressor 108 (for example, adjusting the frequency of the compressor 108). In addition, when the heat pump system is in a full cooling and partial heating mode, the heat provided by the first heat exchanger 101 can be adjusted separately by adjusting the four-way valve 140, without changing the coldness provided by the second heat exchanger 102. Specifically, when the heat pump system is in a full cooling and partial heating mode, the first flow path and the third flow path are in a parallel state, and the flow rate of the fluid flowing through the second flow path (i.e., the second heat exchanger 102) is equal to the sum of the flow rates of the fluids flowing through the first flow path (i.e., the first heat exchanger 101) and the third flow path (i.e., the third heat exchanger 103). Therefore, when the flow rate of the fluid flowing out of the compressor 108 remains unchanged, the flow rate of the fluid flowing through the first flow path (i.e., the first heat exchanger 101) and the third flow path (i.e., the third heat exchanger 103) can be adjusted by adjusting the opening of the first connecting port 141 and the third connecting port 143 of the four-way valve 140, thereby changing the flow rate of the fluid flowing through the first flow path (i.e., the first heat exchanger 101).

[0066] Reference below Figure 8 The third state of the four-way valve 140 is described in detail. Specifically, when the four-way valve 140 is in the third state, the valve body 154 can rotate between the third state first position and the third state second position, and in the process of rotating between the second state third position and the second state third position, the opening of the third communication port 143 is reduced when the opening of the first communication port 141 increases (that is, when the flow rate of the fluid flowing through the first flow path increases, the flow rate of the fluid flowing through the third flow path decreases), and the opening of the third communication port 143 is increased when the opening of the first communication port 141 decreases (that is, when the flow rate of the fluid flowing through the first flow path decreases, the flow rate of the fluid flowing through the third flow path increases).

[0067] Fig. 9 yes Figure 1 The heat pump system shown in the figure is in full cooling and full heating mode. Fig. 9 As shown, through the control of the control device 202, the four-way valve 140 is in the fourth state, the second valve device 132 is opened, the first valve device 131 and the third valve device 133 are closed, and the fan 104 is closed.

[0068] Specifically, the high-temperature and high-pressure gaseous refrigerant flowing out of the exhaust port 112 of the compressor 108 flows to the first heat exchanger 101 through the fourth connecting port 144 and the third connecting port 143 of the four-way valve 140 in sequence. In the first heat exchanger 101, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the fluid with a lower temperature on the user side, thereby raising the temperature of the fluid on the user side to provide the user with a fluid with a higher temperature (i.e., providing heat). The high-temperature and high-pressure gaseous refrigerant becomes a high-pressure liquid refrigerant after exchanging heat with the user side fluid in the first heat exchanger 101. After flowing out of the first heat exchanger 101, the high-pressure liquid refrigerant passes through the first check valve 121 and the throttling device 134 in sequence. After flowing through the throttling device 134, the high-pressure liquid refrigerant becomes a low-temperature and low-pressure refrigerant, and then flows to the second heat exchanger 102 through the second valve device 132. In the second heat exchanger 102, the low-temperature, low-pressure refrigerant exchanges heat with the fluid at the user side with a higher temperature, thereby reducing the temperature of the fluid at the user side to provide the user with a fluid at a lower temperature (i.e., providing cooling capacity). The low-temperature, low-pressure refrigerant exchanges heat with the fluid at the user side in the second heat exchanger 102 and becomes a low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant enters the compressor 108 from the air intake port 111 of the compressor 108 through the first flow port 115 of the second heat exchanger 102, and becomes a high-temperature, high-pressure gaseous refrigerant to complete the refrigerant cycle.

[0069] Thus, when the heat pump system is in full cooling and full heating mode, the compressor 108, the first heat exchanger 101, the second valve device 132 and the second heat exchanger 102 are connected in the refrigerant loop. The first heat exchanger 101 acts as a condenser, and the second heat exchanger 102 acts as an evaporator. The third heat exchanger 103 is not in the refrigerant circulation loop.

[0070] Fig.10 yes Figure 1 The heat pump system in defrost mode is shown in the figure. Fig.10 As shown, through the control of the control device 202, the four-way valve 140 is in the fifth state, the first valve device 131 is opened, the second valve device 132 and the third valve device 133 are closed, and the fan 104 is closed.

[0071] Specifically, the high-temperature and high-pressure gaseous refrigerant flowing out of the exhaust port 112 of the compressor 108 flows to the third heat exchanger 103 through the fourth connecting port 144 and the first connecting port 141 of the four-way valve 140 in sequence. In the third heat exchanger 103, the high-temperature and high-pressure gaseous refrigerant transfers heat to the frost condensed on the third heat exchanger 103, thereby melting the frost. At this time, the fan 104 in the third heat exchanger 103 is not started. After the high-temperature and high-pressure gaseous refrigerant is converted into high-pressure liquid refrigerant in the third heat exchanger 103, it passes through the third one-way valve 123 and the throttling device 134 in sequence. After the high-pressure liquid refrigerant flows through the throttling device 134, it becomes a low-temperature and low-pressure refrigerant, and then flows to the first heat exchanger 101 through the first valve device 131. In the first heat exchanger 101, the low-temperature and low-pressure refrigerant will exchange heat with the fluid on the user side of the first heat exchanger 101, thereby converting the low-temperature and low-pressure refrigerant into a low-pressure gaseous refrigerant. The low-pressure gaseous refrigerant passes through the third communication port 143 and the second communication port 142 of the four-way valve 140 in sequence, and then enters the compressor 108 from the air intake port 111 of the compressor 108 to become a high-temperature and high-pressure gaseous refrigerant to complete the refrigerant cycle.

[0072] Thus, when the heat pump system is in defrost mode, the compressor 108, the third heat exchanger 103, the first valve device 131 and the first heat exchanger 101 are connected in the refrigerant loop. The third heat exchanger 103 acts as a condenser, and the first heat exchanger 101 acts as an evaporator. The second heat exchanger 102 is not in the refrigerant circulation loop.

[0073] The traditional four-pipe heat pump system can achieve full cooling and full heating modes, but in this mode, the cooling capacity and heating capacity can only be loaded or unloaded at the same time, so it cannot match the actual demand for cooling capacity and heating capacity at the same time.

[0074] In the heat pump system of the present application, when the heat pump system is in a full cooling and partial heating mode, under the condition that the cooling capacity (i.e., the heat exchange provided by the second heat exchanger 102) remains unchanged, the flow of the refrigerant passing through the first heat exchanger 101 can be adjusted by controlling the rotation of the valve body 154 in the four-way valve 140, thereby adjusting the opening of the first communication port 141 and the third communication port 143 to adjust the size of the heating capacity (i.e., the heat exchange provided by the first heat exchanger 101). When the heat pump system is in a full heating and partial cooling mode, under the condition that the heating capacity (i.e., the heat exchange provided by the first heat exchanger 101) remains unchanged, the flow of the refrigerant passing through the third heat exchanger 103 can be adjusted by controlling the rotation of the valve body 154 in the four-way valve 140. Since the sum of the refrigerant flow rate through the third heat exchanger 103 and the refrigerant flow rate through the second heat exchanger 102 is constant, adjusting the refrigerant flow rate through the third heat exchanger 103 can adjust the refrigerant flow rate through the second heat exchanger 102, thereby adjusting the cooling capacity (i.e., the heat exchange amount provided by the second heat exchanger 102).

[0075] Figures 11A-11C is an exemplary embodiment of the four-way valve 140 in the heat pump system of the present application. Figures 11A-11C As shown, the four-way valve 140 includes a housing 152 that is roughly cylindrical. The housing 152 defines a cavity for accommodating a valve body 154. Three connecting pipes that are connected to the cavity are evenly arranged on the circumference of the housing 152, and a first connecting port 141, a second connecting port 142, and a third connecting port 143 are formed at the free ends of the three connecting pipes, respectively. The valve body 154 is roughly cylindrical and is arranged along the same central axis as the housing 152. It is arranged in the cavity and can rotate relative to the housing 152 around the central axis of the cylinder. The fourth connecting pipe is arranged along the central axis and extends downward from the lower surface of the housing 152. The lower end (i.e., the free end) of the fourth connecting pipe forms a fourth connecting port 144. Two channel cavities are arranged on the valve body 154, namely, a first channel cavity 1112 and a second channel cavity 1114. The first channel cavity 1112 and the second channel cavity 1114 are arranged independently of each other (i.e., they are not connected to each other). The first channel cavity 1112 is formed by being recessed inwardly from the circumference of the valve body 154, and the opening in the circumferential direction is at a certain angle. The second channel cavity 1114 is also formed by being recessed inwardly from the circumference of the valve body 154, and the opening in the circumferential direction is at a certain angle. In addition, the second channel cavity 1114 also extends downwardly along the central axis and is always connected to the fourth communication port 144, so that the fourth communication port 144 can be connected to at least one of the first communication port 141, the second communication port 142 and the third communication port 143 through the second channel cavity 1114.

[0076] The opening angles of the first channel cavity 1112 and the second channel cavity 1114 in the circumferential direction are set to achieve Figure 4A-4E In order to realize each working mode in the heat pump system. Specifically, when the four-way valve 140 is in the first state, the first connecting port 141 is connected with the fourth connecting port 144 through the second channel cavity 1114, and the second connecting port 142 and the third connecting port 143 are disconnected. When the four-way valve 140 is in the second state, the first connecting port 141 is connected with the second connecting port 142 through the first channel cavity 1112, and the third connecting port 143 is connected with the fourth connecting port 144 through the second channel cavity 1114. The four-way valve 140 is configured as follows: when the valve body 154 rotates between the first position of the second state and the second position of the second state, the value range of the opening of the first connecting port 141 is: . The opening of the first communication port 141 is related to the overlap area between the valve body 154 and the first communication port 141. That is, when the overlap area between the circumferential portion of the valve body 154 and the first communication port 141 is 100%, the opening of the first communication port 141 is 0%; when the overlap area between the circumferential portion of the valve body 154 and the first communication port 141 is 0% (that is, the opening of the first channel cavity 1112 in the circumferential direction is aligned with the first communication port 141), the opening of the first communication port 141 is 100%. Similarly, the range of values ​​of the opening of the second communication port 142 can also be realized as follows: , which will not be described here. Thus, by adjusting the opening of the first communication port 141 and / or the second communication port 142, the flow rate of the fluid flowing through the first channel cavity 1112 can be adjusted. When the four-way valve 140 is in the third state, the first communication port 141 and the third communication port 143 are connected to the fourth communication port 144 through the second channel cavity 1114, and the second communication port 142 is disconnected. The four-way valve 140 is configured to achieve: when the valve body 154 rotates between the first position of the third state and the second position of the third state, when the opening of the first communication port 141 increases, the opening of the third communication port 143 decreases, and when the opening of the first communication port 141 decreases, the opening of the third communication port 143 increases. The opening of the first communication port 141 is related to the overlapping area of ​​the valve body 154 and the first communication port 141. The opening of the third communication port 143 is related to the overlapping area of ​​the valve body 154 and the third communication port 143. That is, when the overlap area of ​​the circumferential portion of the valve body 154 and the third communication port 143 is 100%, the opening of the third communication port 143 is 0%; when the overlap area of ​​the circumferential portion of the valve body 154 and the third communication port 143 is 0% (that is, the opening of the second channel cavity 1114 in the circumferential direction is aligned with the third communication port 143), the opening of the third communication port 143 is 100%. When the four-way valve 140 is in the fourth state, the third communication port 143 is connected to the fourth communication port 144 through the second channel cavity 1114, and the first communication port 141 and the second communication port 142 are disconnected. When the four-way valve 140 is in the fifth state, the first communication port 141 is connected to the second communication port 142 through the second channel cavity 1114, and the second communication port 142 is connected to the third communication port 143 through the first channel cavity 1112.

[0077] It should be noted that, although a four-way valve 140 with a specific connecting structure is shown in the embodiment of the present application, those skilled in the art will understand that any four-way valve that can achieve the above-mentioned connecting and switching methods is within the protection scope of the present application.

[0078] Although the present disclosure has been described in conjunction with the examples of the embodiments summarized above, various alternatives, modifications, changes, improvements and / or substantially equivalent solutions, whether known or currently or foreseeable in the near future, may be apparent to those of ordinary skill in the art. In addition, the technical effects and / or technical problems described in this specification are exemplary rather than restrictive; so the disclosure in this specification may be used to solve other technical problems and have other technical effects and / or may solve other technical problems. Therefore, the examples of the embodiments of the present disclosure as stated above are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to include all known or earlier developed alternatives, modifications, changes, improvements and / or substantially equivalent solutions.

Claims

1. A heat pump system, characterized in that: The heat pump system comprises: A compressor (108), wherein the compressor (108) comprises an air intake port (111) and an air discharge port (112); a first flow path having a first end and a second end; a second flow path having a first end and a second end; a third flow path having a first end and a second end; A first heat exchanger (101), the first heat exchanger (101) being arranged in the first flow path; a second heat exchanger (102), the second heat exchanger (102) being disposed in the second flow path; a third heat exchanger (103), the third heat exchanger (103) being disposed in the third flow path; and A four-way valve (140), the four-way valve (140) having four communication ports; wherein the second end of the first flow path, the second end of the second flow path and the second end of the third flow path are connected to a common path intersection point, the first end of the second flow path is connected to the air intake port (111), the first end of the first flow path, the exhaust port (112), the air intake port (111) and the first end of the third flow path are respectively connected to the four communication ports, and the first end of the first flow path, the exhaust port (112), the air intake port (111) and the first end of the third flow path can be controllably connected through the four-way valve (140); The heat pump system has at least one of a full cooling and partial heating mode and a full heating and partial cooling mode, and is configured as follows: When the heat pump system is in the full cooling and partial heating mode, the exhaust port (112) can be connected to the first end of the first flow path and the first end of the third flow path through the four-way valve (140), and the heat pump system is configured to adjust the flow rate of the fluid flowing through the first flow path and the third flow path by adjusting the four-way valve (140); When the heat pump system is in the full heating and partial cooling mode, the exhaust port (112) can be connected to the first end of the first flow path through the four-way valve (140), and the first end of the third flow path can be connected to the suction port (111) through the four-way valve (140), and the heat pump system is configured to be able to adjust the flow rate of the fluid flowing through the second flow path and the third flow path by adjusting the four-way valve (140).

2. The heat pump system according to claim 1, characterized in that: When the heat pump system is in the full cooling and partial heating mode, the sum of flow rates of the fluid flowing through the first flow path and the third flow path is equal to the flow rate of the fluid flowing through the second flow path.

3. The heat pump system according to claim 1, characterized in that: When the heat pump system is in the full heating and partial cooling mode, the sum of flow rates of the fluid flowing through the second flow path and the third flow path is equal to the flow rate of the fluid flowing through the first flow path.

4. The heat pump system according to claim 1, characterized in that: The heat pump system has a cooling mode. When the heat pump system is in the cooling mode, the exhaust port (112) is connected to the first end of the third flow path through the four-way valve (140), and the intake port (111) is disconnected from the first end of the first flow path through the four-way valve (140).

5. The heat pump system according to claim 1, characterized in that: The heat pump system also has a heating mode. When the heat pump system is in the heating mode, the exhaust port (112) is connected to the first end of the first flow path through the four-way valve (140), and the intake port (111) is connected to the first end of the third flow path through the four-way valve (140).

6. The heat pump system according to claim 1, characterized in that: The heat pump system also has a complete cooling and complete heating mode. When the heat pump system is in the complete cooling and complete heating mode, the exhaust port (112) is connected to the first end of the first flow path through the four-way valve (140), and the air intake port (111) is disconnected from the first end of the third flow path through the four-way valve (140).

7. The heat pump system according to claim 1, characterized in that: The heat pump system also has a defrost mode. When the heat pump system is in the defrost mode, the exhaust port (112) is connected to the first end of the third flow path through the four-way valve (140), and the first end of the first flow path is connected to the air intake port (111).

8. The heat pump system according to claim 1, characterized in that: The heat pump system further comprises: A first valve device (131), the first valve device (131) being arranged in the first flow path, the first valve device (131) comprising a first valve device inlet and a first valve device outlet; a second valve device (132), the second valve device (132) being disposed in the second flow path, the second valve device (132) comprising a second valve device inlet and a second valve device outlet; and A third valve device (133), the third valve device (133) being arranged in the third flow path, the third valve device (133) comprising a third valve device inlet and a third valve device outlet; Wherein, the first valve device inlet, the second valve device inlet and the third valve device inlet are connected to the path intersection point.

9. The heat pump system according to claim 8, characterized in that: The heat pump system further comprises a first bypass, a third bypass, and a first one-way valve (121) and a third one-way valve (123) respectively arranged in the first bypass and the third bypass; The first end of the first bypass is connected to the outlet of the first valve device, the first end of the third bypass is connected to the outlet of the third valve device, and the second end of the first bypass and the second end of the third bypass are connected to a common bypass junction so as to controllably bypass the first valve device (131) and the third valve device (133), respectively, so that the first heat exchanger (101) and the third heat exchanger (103) can be connected to the bypass junction fluid respectively.

10. A four-way valve, characterized in that: The four-way valve (140) comprises: a housing (152); and a valve body (154), the valve body (154) being disposed in the housing (152); The valve body (154) has a central axis and is capable of moving around the central axis relative to the housing (152); the valve body (154) is provided with a first channel cavity (1112) and a second channel cavity (1114) that are independent of each other; The shell (152) is provided with a first communication port (141), a second communication port (142), a third communication port (143) and a fourth communication port (144); Wherein, the fourth communication port (144) can be communicated with at least one of the first communication port (141), the second communication port (142) and the third communication port (143) through the second channel cavity (1114); The valve body (154) is rotatable relative to the housing (152) so that the four-way valve has a first state, a second state, a third state, a fourth state and a fifth state, and the four-way valve is configured as follows: When the four-way valve is in the first state, the first communication port (141) is connected to the fourth communication port (144) through the second channel cavity (1114), and the second communication port (142) is disconnected from the third communication port (143); When the four-way valve is in the second state, the first communication port (141) is in communication with the second communication port (142) through the first channel cavity (1112), and the third communication port (143) is in communication with the fourth communication port (144) through the second channel cavity (1114); When the four-way valve is in the third state, the first communication port (141), the third communication port (143) and the fourth communication port (144) are connected through the second channel cavity (1114), and the second communication port (142) is disconnected; When the four-way valve is in the fourth state, the third communication port (143) is connected to the fourth communication port (144) through the second channel chamber (1114), and the first communication port (141) is disconnected from the second communication port (142); and When the four-way valve is in the fifth state, the first communication port (141) is communicated with the fourth communication port (144) through the second channel cavity (1114), and the second communication port (142) is communicated with the third communication port (143) through the first channel cavity (1112).

11. The four-way valve according to claim 10, characterized in that: The shell (152) is cylindrical, the first communication port (141), the second communication port (142) and the third communication port (143) are arranged on the shell (152) along the circumferential direction, and the fourth communication port (144) is arranged along the central axis.

12. The four-way valve according to claim 10, characterized in that: The four-way valve is configured such that: when the four-way valve is in the second state, the valve body (154) can rotate between a first position in the second state and a second position in the second state, and during the rotation between the first position in the second state and the second position in the second state, the opening of the first connecting port (141) and / or the second connecting port (142) is in the range of φ∈(0%, 100%].

13. The four-way valve according to claim 12, characterized in that: The opening degree of the first communication port (141) is related to the overlapping area between the valve body (154) and the first communication port (141).

14. The four-way valve according to claim 10, characterized in that: The four-way valve is configured as follows: when the four-way valve is in the third state, the valve body (154) is able to rotate between a first position in the third state and a second position in the third state, and during the rotation between the first position in the third state and the second position in the third state, the opening of the third connecting port (143) is reduced when the opening of the first connecting port (141) is increased, and the opening of the third connecting port (143) is increased when the opening of the first connecting port (141) is reduced.

15. The four-way valve according to claim 14, characterized in that: The opening degree of the first communication port (141) is related to the overlapping area between the valve body (154) and the first communication port (141), and the opening degree of the third communication port (143) is related to the overlapping area between the valve body (154) and the third communication port (143).

Images