Water source heat pump system and plate heat exchanger thereof

Abstract

This utility model discloses a water source heat pump system and its plate heat exchanger, including a shell, a refrigerant inlet, a refrigerant outlet, a water inlet, a water outlet, a connection port, and a switching device. A refrigerant channel and a water channel are formed inside the shell. The refrigerant inlet and outlet are located on the shell and communicate with the refrigerant channel; the water inlet and outlet are located on the shell and communicate with the water channel; the connection port communicates with the refrigerant channel and is configured as a vacuum port and / or a refrigerant charging port; the switching device is located on the connection port and is used to connect or disconnect the connection port. Therefore, the plate heat exchanger can be directly connected to the refrigerant pipeline of an existing refrigerant circulation system. After connection, vacuuming and refrigerant charging can be performed without disassembly. The connection structure between the plate heat exchanger and the refrigerant pipeline of the refrigerant circulation system is simple, reducing installation and maintenance costs, saving space, improving installation efficiency, and ensuring the safety of the refrigerant charging process.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning equipment technology, specifically, it relates to a water source heat pump system and its plate heat exchanger. Background Technology

[0002] When plate heat exchangers are used in water source heat pump systems, they are generally installed in the compressor compartment inside the outdoor unit of the air conditioner.

[0003] Existing plate heat exchangers have refrigerant and water channels. The refrigerant channels connect to refrigerant interfaces, and the water channels connect to water interfaces, both located on the same side of the plate heat exchanger. This type of plate heat exchanger cannot be vacuumed or refrigerant charged after connection, requiring a series shut-off valve and additional shut-off valve and fixing device within the compressor compartment. The existing structure of the plate heat exchanger results in complex connecting pipes, making installation difficult within the confined space of the compressor compartment. Furthermore, the plate heat exchanger cannot be directly charged with refrigerant after installation; it must be disassembled, vacuumed, and charged before reinstallation, leading to low installation efficiency. Disassembly and refrigerant charging also present safety risks.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Utility Model Content

[0005] This utility model proposes a water source heat pump system and its plate heat exchanger to solve the technical problems of complex connection pipelines, low installation efficiency and safety risks of refrigerant charging in existing plate heat exchangers.

[0006] To achieve the above-mentioned utility model / design objectives, the present utility model adopts the following technical solution:

[0007] A plate heat exchanger for a water source heat pump system, comprising:

[0008] The outer casing contains refrigerant channels and water channels.

[0009] The refrigerant inlet and refrigerant outlet are located on the outer casing and are connected to the refrigerant channel;

[0010] The water inlet and water outlet are located on the outer casing and communicate with the water channel;

[0011] The plate heat exchanger also includes:

[0012] A connection port is connected to the refrigerant channel, and the connection port is configured as a vacuum port and / or a refrigerant charging port;

[0013] A switching device, located on the connection port, is used to turn the connection port on or off.

[0014] As described above, in the plate heat exchanger of the water source heat pump system, the outer shell includes a first side and a second side opposite to each other, the refrigerant inlet and refrigerant outlet are located on the first side, and the water inlet, water outlet and connection port are located on the second side.

[0015] In the plate heat exchanger of the water source heat pump system described above, the connection port is connected to the refrigerant channel via a connecting pipe; the refrigerant channel between the refrigerant inlet and the refrigerant outlet is a connecting pipe.

[0016] As described above, in the plate heat exchanger of the water source heat pump system, the connection port is arranged opposite to the refrigerant inlet, a first connecting pipe is provided between the connection port and the refrigerant inlet, and the refrigerant outlet is connected to the first connecting pipe through a second connecting pipe;

[0017] Alternatively, the connection port is positioned opposite to the refrigerant outlet, a first connecting pipe is provided between the connection port and the refrigerant outlet, and the refrigerant inlet is connected to the first connecting pipe via a second connecting pipe.

[0018] As described above, in the plate heat exchanger of the water source heat pump system, the refrigerant inlet and refrigerant outlet are respectively located near the opposite ends of the outer shell, and the water inlet and water outlet are respectively located near the opposite ends of the outer shell.

[0019] The plate heat exchanger of the water source heat pump system described above, the housing includes a first end and a second end opposite each other in its length direction;

[0020] The refrigerant inlet is located near the first end of the outer casing, the refrigerant outlet is located near the second end of the outer casing, the water inlet is located near the second end of the outer casing, and the water outlet is located near the first end of the outer casing.

[0021] Alternatively, the refrigerant inlet is located near the second end of the housing, the refrigerant outlet is located near the first end of the housing, the water inlet is located near the first end of the housing, and the water outlet is located near the second end of the housing.

[0022] As described above, in the plate heat exchanger of the water source heat pump system, the connection port includes a first port and a second port arranged at a certain angle, the first port being configured as a vacuum port and / or a refrigerant charging port; the switching device includes a valve core located in the second port, the valve core having a conducting state that connects the first port and a closing state that closes the first port.

[0023] As described above, in the plate heat exchanger of the water source heat pump system, the second port is perpendicular or nearly perpendicular to the outer casing, the first port is parallel or nearly parallel to the outer casing, and the first port is at a certain angle to the length direction of the outer casing.

[0024] A water source heat pump system includes an outdoor unit, refrigerant piping for a refrigerant circulation system, and water piping for a water circulation system. The outdoor unit is equipped with a compressor and the aforementioned plate heat exchanger. The refrigerant inlet and refrigerant outlet are connected to the refrigerant piping for the refrigerant circulation system, and the water inlet and water outlet are connected to the water piping for the water circulation system.

[0025] In the water source heat pump system described above, the first side where the refrigerant inlet and refrigerant outlet are located faces the compressor.

[0026] Compared with existing technologies, the advantages and positive effects of this utility model are as follows: The plate heat exchanger of the water source heat pump system includes a shell, a refrigerant inlet, a refrigerant outlet, a water inlet, a water outlet, a connection port, and a switching device; a refrigerant channel and a water channel are formed inside the shell; the refrigerant inlet and refrigerant outlet are located on the shell and communicate with the refrigerant channel; the water inlet and water outlet are located on the shell and communicate with the water channel; the connection port communicates with the refrigerant channel and is configured as a vacuum port and / or a refrigerant charging port; the switching device is located on the connection port and is used to connect or disconnect the connection port. The plate heat exchanger directly sets the connection port communicating with the refrigerant channel on the shell, and realizes the connection port's opening and closing through the switching device. Therefore, the plate heat exchanger can be directly connected to the refrigerant pipeline of the existing refrigerant circulation system. After connection, vacuuming and refrigerant charging can be performed without disassembly. The connection structure between the plate heat exchanger and the refrigerant pipeline of the refrigerant circulation system is simple, reducing installation and maintenance costs, saving space, improving installation efficiency, and ensuring the safety of the refrigerant charging process.

[0027] This utility model's water source heat pump system includes an outdoor unit, which is equipped with a compressor and the aforementioned plate heat exchanger. The refrigerant inlet and outlet are connected to the refrigerant piping of the refrigerant circulation system where the compressor is located, and the water inlet and outlet are connected to the water piping of the water circulation system. The plate heat exchanger has a connection port directly on its shell that communicates with the refrigerant channel, and the connection port is opened and closed via a switching device. Therefore, the plate heat exchanger can be directly connected to the existing refrigerant piping of the refrigerant circulation system. After connection, vacuuming and refrigerant charging can be performed without disassembling the plate heat exchanger. The connection structure between the plate heat exchanger and the refrigerant piping of the refrigerant circulation system is simple, reducing installation and maintenance costs, saving space, improving installation efficiency, facilitating refrigerant charging, and ensuring the safety of the refrigerant charging process.

[0028] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the first side view of a plate heat exchanger according to a specific embodiment of this utility model.

[0031] Figure 2 This is a schematic diagram of the second side of a plate heat exchanger according to a specific embodiment of this utility model.

[0032] Figure 3 This is a specific embodiment of the present utility model. Figure 1 The left view.

[0033] Figure 4 This is a specific embodiment of the present utility model. Figure 1 Top view.

[0034] Figure 5 This is a specific embodiment of the present utility model. Figure 2 A schematic diagram of the internal structure with part of the shell removed.

[0035] Figure 6 This is a specific embodiment of the present utility model. Figure 5 Sectional view along line AA.

[0036] Figure 7 This is a cross-sectional view of the switching device when the connection port is closed.

[0037] Figure 8 A cross-sectional view of the switching device when the connection port is open.

[0038] In the picture:

[0039] 1. Outer shell; 11. First side surface; 12. Second side surface; 13. First end; 14. Second end

[0040] 21. Refrigerant inlet; 22. Refrigerant outlet; 23. Refrigerant passage;

[0041] 31. Waterway inlet; 32. Waterway outlet; 33. Waterway passage;

[0042] 4. Connection port; 41. First port; 42. Second port;

[0043] 5. Switching device;

[0044] 61. First connecting pipe; 62. Second connecting pipe. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0046] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of the embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0048] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0049] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0050] Plate heat exchangers are used in systems where heat needs to be transferred from one fluid to another. When applied to water source heat pump systems in residential environments, plate heat exchangers are typically installed in the compressor compartment of the outdoor unit. Since the size of the compressor compartment is fixed, to minimize changes to the compartment structure and simplify the connection between the plate heat exchanger and the outdoor unit piping, the existing plate heat exchanger structure is improved, resulting in a new type. This new type adds connection ports and switching devices. Simultaneously, the positions of the refrigerant inlet and outlet, as well as the water inlet and outlet, are adjusted to simplify the connection between the plate heat exchanger and the outdoor unit piping, facilitate refrigerant charging, and improve the safety of the refrigerant charging process.

[0051] The plate heat exchanger of the water source heat pump system is described in detail below with reference to the attached diagram:

[0052] like Figures 1-8 As shown, a plate heat exchanger for a water source heat pump system includes a shell 1, a refrigerant inlet 21, a refrigerant outlet 22, a water inlet 31, a water outlet 32, a connection port 4, and a switching device 5.

[0053] The outer shell 1 forms the external shape of the plate heat exchanger, and the refrigerant channel 23 and water channel 33 are formed inside the outer shell 1.

[0054] The refrigerant passage 23 is used to transport refrigerant, and the water passage 33 is used to transport water. The refrigerant passage 23 and the water passage 33 are used to realize heat exchange between the refrigerant system and the water system.

[0055] The refrigerant inlet 21 and refrigerant outlet 22 are both located on the outer casing 1 and are connected to the refrigerant channel 23.

[0056] Both the refrigerant inlet 21 and the refrigerant outlet 22 are connected to the refrigerant pipeline of the refrigerant circulation system. The refrigerant inlet 21 receives the refrigerant from the refrigerant pipeline of the refrigerant circulation system and allows the refrigerant to enter the refrigerant channel 23 inside the outer casing 1. The refrigerant outlet 22 discharges the refrigerant in the refrigerant channel 23 from the outer casing 1 and allows the refrigerant to re-enter the refrigerant pipeline of the refrigerant circulation system for circulation.

[0057] The refrigerant channel 23 can be configured as a tube, and the refrigerant channel 23 can be a straight tube, a threaded tube, or an S-shaped tube, etc.

[0058] Both the waterway inlet 31 and the waterway outlet 32 ​​are located on the outer shell 1 and are connected to the waterway channel 33.

[0059] Both the water inlet 31 and the water outlet 32 ​​are connected to the water pipes of the water circulation system. The water inlet 31 receives water from the water pipes of the water circulation system and allows the water to enter the water channel 33 inside the outer casing 1. The water outlet 32 ​​discharges the water in the water channel 33 out of the outer casing 1 and allows the water to re-enter the water pipes of the water circulation system for circulation.

[0060] The water channel 33 can be set as a cavity inside the outer shell 1 to increase the water channel space, and the refrigerant channel 23 is located inside the water channel 33.

[0061] Several flow-slowing structures are installed in the water channel 33 to slow down the water flow speed in the water channel 33, increase the contact time with the refrigerant in the refrigerant channel 23, and increase the heat exchange between the water circulation system and the refrigerant circulation system.

[0062] The flow-slowing structure can be, for example, several flow-slowing plates installed in the water channel 33.

[0063] Connection port 4 is connected to refrigerant channel 23. Connection port 4 is configured as a vacuum port and / or refrigerant charging port to vacuum and / or charge refrigerant to refrigerant channel 23 through connection port 4.

[0064] The switch device 5 is located on the connection port 4. The switch device 5 is used to turn the connection port 4 on or off to open or close the refrigerant passage 23.

[0065] For ease of operation, the switch device 5 is a valve installed on the connection port 4.

[0066] The valve can be a manual valve or an electronic valve.

[0067] The outer casing 1 includes a first side 11 and a second side 12 opposite to each other, wherein the refrigerant inlet 21 and the refrigerant outlet 22 are located on the first side 11, and the water inlet 31, the water outlet 32 ​​and the connection port 4 are located on the second side 12.

[0068] The arrangement of refrigerant inlet 21 and refrigerant outlet 22, water inlet 31, water outlet 32 ​​and connection port 4 facilitates the connection between the plate heat exchanger and the refrigerant pipeline of the refrigerant circulation system and the water pipeline of the water circulation system, reducing the length of the connecting pipe and saving costs.

[0069] The first side 11, where the refrigerant inlet 21 and refrigerant outlet 22 are located, faces the compressor to facilitate connection with the refrigerant circulation pipeline of the refrigerant circulation system. The second side 12, where the water inlet 31, water outlet 32 ​​and connection port 4 are located, faces away from the compressor to facilitate connection with the water pipeline of the water circulation system.

[0070] The connection port 4 is connected to the refrigerant channel 23 via a connecting pipe; the refrigerant channel 23 between the refrigerant inlet 21 and the refrigerant outlet 22 is a connecting pipe.

[0071] Connection port 4 is positioned opposite to refrigerant inlet 21. A first connecting pipe 61 is provided between connection port 4 and refrigerant inlet 21. Refrigerant outlet 22 is connected to the first connecting pipe 61 through a second connecting pipe 62. The second connecting pipe 62 and the first connecting pipe 61 form a refrigerant channel 23.

[0072] In some other embodiments, the connection port 4 is positioned opposite to the refrigerant outlet 22, and a first connecting pipe 61 is provided between the connection port 4 and the refrigerant outlet 22. The refrigerant inlet 21 is connected to the first connecting pipe 61 through a second connecting pipe 62. The second connecting pipe 62 and the first connecting pipe 61 form a refrigerant channel 23.

[0073] In order to improve the heat exchange between the refrigerant passage 23 and the water passage 33, the refrigerant inlet 21 and the refrigerant outlet 22 are located near the opposite ends of the outer shell 1, and the water inlet 31 and the water outlet 32 ​​are located near the opposite ends of the outer shell 1.

[0074] Furthermore, the refrigerant inlet 21 and refrigerant outlet 22 are located near the opposite ends of the outer casing 1 along its length, and the water inlet 31 and water outlet 32 ​​are located near the opposite ends of the outer casing 1 along its length, in order to further improve the heat exchange between the refrigerant channel 23 and the water channel 33.

[0075] Specifically, the outer casing 1 includes a first end 13 and a second end 14 opposite each other in its length direction.

[0076] The first end 13 is connected to the first side 11 and the second side 12, and the second end 14 is connected to the first side 11 and the second side 12.

[0077] The refrigerant inlet 21 is located near the first end 13 of the outer casing 1, the refrigerant outlet 22 is located near the second end 14 of the outer casing 1, and the water inlet 31 is located near the second end 14 of the outer casing 1, while the water outlet 32 ​​is located near the first end 13 of the outer casing 1.

[0078] The outer shell 1 is a cuboid. The height of the outer shell 1 is greater than the length and width of the outer shell 1. The first end 13 is the top end of the outer shell 1, and the second end 14 is the bottom end of the outer shell 1.

[0079] In some other embodiments, the refrigerant inlet 21 is close to the second end 14 of the outer casing 1, the refrigerant outlet 22 is close to the first end 13 of the outer casing 1, the water inlet 31 is close to the first end 13 of the outer casing 1, and the water outlet 32 ​​is close to the second end 14 of the outer casing 1.

[0080] The outer shell 1 is a cuboid. The height of the outer shell 1 is greater than the length and width of the outer shell 1. The first end 13 is the top end of the outer shell 1, and the second end 14 is the bottom end of the outer shell 1.

[0081] The connection port 4 includes a first port 41 and a second port 42 set at a certain angle, and the first port 41 and the second port 42 are connected and communicate with each other.

[0082] like Figure 7 , Figure 8 As shown, the first port 41 is configured as a vacuum port and / or a refrigerant charging port; the switching device 5 includes a valve core located within the second port 42, the second port 42 forming a valve body, and the valve core having a conducting state that connects to the first port 41 and a closing state that closes to the first port 41. When the valve core retracts into the second port 42, the first port 41 is in a conducting state, that is, the connection port 4 is in a conducting state; when the valve core extends from the second port 42 to the first port 41 and is sealed to the first port 41, the first port 41 is in a closing state, that is, the connection port 4 is in a closing state.

[0083] To facilitate the operation of the switching device 5 and to make it convenient to connect the first port 41 to the vacuum device or refrigerant charging device, the second port 42 is perpendicular or nearly perpendicular to the outer casing 1, the first port 41 is parallel or nearly parallel to the outer casing 1, and the first port 41 is at a certain angle to the length direction of the outer casing 1.

[0084] Specifically, the second port 42 is perpendicular or nearly perpendicular to the second side of the housing 1, and the first port 41 is parallel or nearly parallel to the second side of the housing 1.

[0085] When installing the plate heat exchanger, the first side 11 faces the compressor, the second side 12 faces away from the compressor, and the refrigerant inlet 21 and refrigerant outlet 22 face the compressor and are directly connected to the refrigerant pipeline of the refrigerant circulation system where the compressor is located. This can reduce the length of the refrigerant circulation connection pipeline and avoid complex refrigerant circulation connection pipeline structure. The water inlet 31 and water outlet 32 ​​face away from the compressor and are directly connected to the water pipeline of the water circulation system. This can reduce the length of the water circulation connection pipeline and avoid complex water circulation connection pipeline structure.

[0086] After connecting the plate heat exchanger to the refrigerant circulation pipeline and the water circulation pipeline, connection port 4 can be connected to the vacuuming device. Turn on switch device 5 to initiate the vacuuming operation. After vacuuming, turn off switch device 5, connect connection port 4 to the refrigerant charging device, turn on switch device 5 to charge the refrigerant, and turn off switch device 5 after charging is complete. Therefore, vacuuming and refrigerant charging can be performed directly on the plate heat exchanger without disassembling it, ensuring the safety and efficiency of refrigerant charging. Furthermore, there is no need to install a shut-off valve connected in series with the plate heat exchanger in the refrigerant pipeline of the refrigerant circulation system, thus eliminating the need for a shut-off valve installation structure, simplifying the refrigerant pipeline structure, reducing costs, and saving space.

[0087] This embodiment also proposes a water source heat pump system, including an outdoor unit, a refrigerant pipeline of a refrigerant circulation system, and a water pipeline of a water circulation system. The outdoor unit is equipped with a compressor and the aforementioned plate heat exchanger. The refrigerant inlet 21 and refrigerant outlet 22 of the plate heat exchanger are connected to the refrigerant pipeline of the refrigerant circulation system, and the water inlet 31 and water outlet 32 ​​are connected to the water pipeline of the water circulation system.

[0088] The first side 11, where the refrigerant inlet 21 and refrigerant outlet 22 are located, faces the compressor to reduce the length and complexity of the piping connections.

[0089] The refrigerant piping of the refrigerant circulation system where the compressor is located is connected in sequence to: compressor, four-way valve, plate heat exchanger, throttling device and first heat exchanger.

[0090] The process by which the plate heat exchanger generates cooling capacity to refrigerate the water pipes of the water circulation system is as follows: the high-temperature, high-pressure refrigerant discharged from the compressor enters the first heat exchanger after passing through a four-way valve, then enters the plate heat exchanger through a throttling device, and finally returns to the compressor. The first heat exchanger is a condenser, and the plate heat exchanger is an evaporator. The refrigerant passage 23 of the plate heat exchanger generates cooling capacity and transfers it to the water passage 33 to achieve cooling of the water pipes of the water circulation system.

[0091] The process by which the plate heat exchanger generates heat to heat the water pipes of the water circulation system is as follows: the high-temperature, high-pressure refrigerant discharged from the compressor enters the plate heat exchanger after passing through a four-way valve, then enters the first heat exchanger through a throttling device, and finally returns to the compressor. The plate heat exchanger acts as a condenser, and the first heat exchanger acts as an evaporator. The refrigerant passage 23 of the plate heat exchanger generates heat and transfers it to the water passage 33 to heat the water pipes of the water circulation system.

[0092] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by this utility model.

Claims

1. A plate heat exchanger for a water source heat pump system, comprising: The outer casing contains refrigerant channels and water channels. The refrigerant inlet and refrigerant outlet are located on the outer casing and are connected to the refrigerant channel; The water inlet and water outlet are located on the outer casing and communicate with the water channel; The plate heat exchanger is characterized in that it further includes: A connection port is connected to the refrigerant channel, and the connection port is configured as a vacuum port and / or a refrigerant charging port; A switching device, located on the connection port, is used to turn the connection port on or off.

2. The plate heat exchanger of the water source heat pump system according to claim 1, characterized in that, The housing includes a first side and a second side opposite to each other, with the refrigerant inlet and refrigerant outlet located on the first side, and the water inlet, water outlet and connection port located on the second side.

3. The plate heat exchanger of the water source heat pump system according to claim 1, characterized in that, The connection port is connected to the refrigerant channel via a connecting pipe; the refrigerant channel between the refrigerant inlet and the refrigerant outlet is a connecting pipe.

4. The plate heat exchanger of the water source heat pump system according to claim 3, characterized in that, The connection port is positioned opposite to the refrigerant inlet, a first connecting pipe is provided between the connection port and the refrigerant inlet, and the refrigerant outlet is connected to the first connecting pipe via a second connecting pipe; Alternatively, the connection port is positioned opposite to the refrigerant outlet, a first connecting pipe is provided between the connection port and the refrigerant outlet, and the refrigerant inlet is connected to the first connecting pipe via a second connecting pipe.

5. The plate heat exchanger of the water source heat pump system according to claim 1, characterized in that, The refrigerant inlet and refrigerant outlet are located near opposite ends of the outer casing, and the water inlet and water outlet are located near opposite ends of the outer casing.

6. The plate heat exchanger of the water source heat pump system according to claim 5, characterized in that, The outer casing includes a first end and a second end opposite each other in its length direction; The refrigerant inlet is located near the first end of the outer casing, the refrigerant outlet is located near the second end of the outer casing, the water inlet is located near the second end of the outer casing, and the water outlet is located near the first end of the outer casing. Alternatively, the refrigerant inlet is located near the second end of the housing, the refrigerant outlet is located near the first end of the housing, the water inlet is located near the first end of the housing, and the water outlet is located near the second end of the housing.

7. The plate heat exchanger of the water source heat pump system according to any one of claims 1-6, characterized in that, The connection port includes a first port and a second port set at a certain angle. The first port is configured as a vacuum port and / or a refrigerant charging port. The switching device includes a valve core located in the second port. The valve core has a conducting state that connects the first port and a closing state that disconnects the first port.

8. The plate heat exchanger of the water source heat pump system according to claim 7, characterized in that, The second port is perpendicular or nearly perpendicular to the outer casing, the first port is parallel or nearly parallel to the outer casing, and the first port is at a certain angle to the length direction of the outer casing.

9. A water source heat pump system, comprising an outdoor unit, refrigerant piping for a refrigerant circulation system, and water piping for a water circulation system, characterized in that, The outdoor unit is equipped with a compressor and a plate heat exchanger as described in any one of claims 1-7. The refrigerant inlet and refrigerant outlet are connected to the refrigerant pipeline of the refrigerant circulation system, and the water inlet and water outlet are connected to the water pipeline of the water circulation system.

10. The water source heat pump system according to claim 9, characterized in that, The first side where the refrigerant inlet and refrigerant outlet are located faces the compressor.

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