Plate heat exchanger and heat pump system

Abstract

The utility model belongs to the technical field of heat pumps, and particularly discloses a plate heat exchanger and a heat pump system. The plate heat exchanger comprises a liquid storage tank and a heat exchange body, the heat exchange body is provided with a refrigerant flow channel and a medium flow channel which are used for heat exchange, the liquid storage tank is provided with a liquid storage cavity, a refrigerant inlet, a refrigerant outlet and a medium inlet, and the medium outlet and the refrigerant outlet are communicated with the liquid storage cavity; a first inlet of the refrigerant flow channel communicates with the refrigerant inlet, a first outlet of the refrigerant flow channel communicates with the liquid storage cavity, a second inlet of the medium flow channel communicates with the medium inlet, and a second outlet of the medium flow channel communicates with the medium outlet. The plate heat exchanger has the heat exchange function and the liquid storage function, a connecting pipeline is omitted, and miniaturization is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a plate heat exchanger and a heat pump system. Background Art

[0002] A heat pump system uses a refrigerant to absorb heat from a low-temperature heat source and transfer it to a high-temperature heat source. It can provide users with various functions, including heating, cooling, and hot water, and boasts numerous advantages, including cleanliness, environmental protection, and high energy efficiency. The refrigerant absorbs heat from the low-temperature heat source in the evaporator, is then compressed in the compressor, raising its temperature and pressure, and finally releases the heat to the high-temperature heat source in the condenser. The refrigerant circulates through the pipelines, repeating this process. Existing heat pump systems typically include a liquid storage tank. This tank's primary function is to regulate the flow of refrigerant in the pipelines, preventing excessive refrigerant from causing liquid hammer damage to the compressor. The reservoir's inlet is connected to the heat pump system via piping, and its outlet is also connected to the condenser. This complex piping structure occupies a significant amount of space, making the heat pump system bulky overall. This poses significant challenges for use in confined spaces, such as air conditioner units within a building. Furthermore, the complex welding process between the pipes contributes to the high cost of the heat pump system. Utility Model Content

[0003] The first technical problem solved by the present invention is to provide a plate heat exchanger, which can solve the problem that the existing condenser is connected to the liquid storage tank through a pipeline, which occupies a lot of space, makes the overall volume of the heat pump system larger, and the pipeline structure welding process is complicated and the cost is high.

[0004] The second technical problem solved by the present invention is to provide a heat pump system, which has a plate heat exchanger that can solve the problem that the existing condenser is connected to the liquid storage tank through a pipeline, which occupies a lot of space, making the overall volume of the heat pump system larger, and the pipeline structure welding process is complex and the cost is high.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A plate heat exchanger is provided, comprising a liquid storage tank and a heat exchange body, wherein the heat exchange body has a refrigerant flow channel and a medium flow channel for heat exchange, the liquid storage tank has a liquid storage cavity, a refrigerant inlet, a refrigerant outlet, a medium inlet, and a medium outlet, wherein the refrigerant outlet is connected to the liquid storage cavity; the first inlet of the refrigerant flow channel is connected to the refrigerant inlet, the first outlet of the refrigerant flow channel is connected to the liquid storage cavity, the second inlet of the medium flow channel is connected to the medium inlet, and the second outlet of the medium flow channel is connected to the medium outlet.

[0007] The plate heat exchanger described in the present invention has the following beneficial effects compared with the background technology: the plate heat exchanger includes a liquid storage tank and a heat exchange body. The heat exchange body has a refrigerant flow channel and a medium flow channel for heat exchange, and the refrigerant and the medium realize heat exchange during the flow in their respective flow channels. The liquid storage tank has a liquid storage cavity, a refrigerant inlet, a refrigerant outlet, a medium inlet, and a medium outlet, and the refrigerant outlet is connected to the liquid storage cavity; the first inlet of the refrigerant flow channel is connected to the refrigerant inlet, the first outlet of the refrigerant flow channel is connected to the liquid storage cavity, the second inlet of the medium flow channel is connected to the medium inlet, and the second outlet of the medium flow channel is connected to the medium outlet. The external refrigerant enters the first inlet through the refrigerant inlet, and after flowing through the refrigerant flow channel, it flows out from the first outlet to enter the liquid storage cavity for liquid storage, thereby achieving a liquid storage effect. The external medium enters the second inlet through the medium inlet, and after flowing through the medium flow channel, it flows out of the medium outlet through the second outlet. The liquid storage tank is directly connected to the heat exchange body, eliminating complex connecting pipelines, integrating the heat exchange function and the liquid storage function into one, which is conducive to simplifying the structure and processing technology, thereby reducing production costs; moreover, the integrated structure reduces the occupied space and avoids being restricted to a small space environment.

[0008] In one embodiment, the plate heat exchanger further includes a drain pipe, which is disposed in the liquid storage cavity and has one port connected to the refrigerant outlet. The height of the other port of the drain pipe is higher than that of the refrigerant outlet.

[0009] In one embodiment, the refrigerant outlet is provided at the bottom of the liquid storage chamber, and one end of the drain pipe away from the refrigerant outlet extends along the height direction of the liquid storage chamber.

[0010] In one embodiment, the liquid storage tank includes a side frame and a front panel and a rear panel that are relatively arranged. The front panel and the rear panel are respectively covered on both ends of the side frame to form the liquid storage cavity; the refrigerant inlet, the refrigerant outlet, the medium inlet and the medium outlet are all opened on the front panel, and the heat exchange body is connected to the outside of the rear panel.

[0011] In one embodiment, the rear panel is provided with a first opening, a second opening, a third opening and a fourth opening, the first opening correspondingly connects the first inlet and the refrigerant inlet, the second opening correspondingly connects the first outlet and the liquid storage chamber, the third opening correspondingly connects the second inlet and the medium inlet, and the fourth opening correspondingly connects the second outlet and the medium outlet.

[0012] In one embodiment, the plate heat exchanger further includes a first conducting tube, a second conducting tube, and a third conducting tube, both ends of which are clamped between the front panel and the rear panel, the two ends of the first conducting tube are respectively connected to the refrigerant inlet and the first opening, the two ends of the second conducting tube are respectively connected to the medium inlet and the third opening, and the two ends of the third conducting tube are respectively connected to the medium outlet and the fourth opening.

[0013] In one embodiment, the plate heat exchanger further includes a back plate connected to the other side of the heat exchange body away from the rear panel.

[0014] In one embodiment, the inner side of the rear panel is recessed to form a third groove.

[0015] In one embodiment, the heat exchange body includes multiple first heat exchange plates and multiple second heat exchange plates, the front side of the first heat exchange plate is provided with a first groove, and the front side of the second heat exchange plate is provided with a second groove. When the multiple first heat exchange plates and the multiple second heat exchange plates are arranged alternately in sequence, the front side of the second heat exchange plate is fitted and connected to the rear side of the adjacent first heat exchange plate to close the second groove to form a second branch flow channel, and the multiple second branch flow channels are connected in parallel to form the medium flow channel, the front side of the first heat exchange plate is fitted and connected to the rear side of the adjacent second heat exchange plate to close the first groove to form a first branch flow channel, and the multiple first branch flow channels are connected in parallel to form the refrigerant flow channel.

[0016] The second technical problem mentioned above is solved by the following technical solution:

[0017] A heat pump system is provided, comprising a refrigerant circulation pipeline and the plate heat exchanger of any one of the above embodiments, wherein the refrigerant inlet and the refrigerant outlet of the plate heat exchanger are both connected to the refrigerant circulation pipeline.

[0018] Compared to the prior art, the heat pump system described in the present invention has the following advantages: the heat pump system comprises the aforementioned plate heat exchanger, wherein the plate heat exchanger's liquid storage tank comprises a liquid storage chamber, a refrigerant inlet, a refrigerant outlet, a medium inlet, and a medium outlet, wherein the refrigerant outlet is connected to the liquid storage chamber; the first inlet of the refrigerant flow channel is connected to the refrigerant inlet, the first outlet of the refrigerant flow channel is connected to the liquid storage chamber, the second inlet of the medium flow channel is connected to the medium inlet, and the second outlet of the medium flow channel is connected to the medium outlet. External refrigerant enters the first inlet through the refrigerant inlet and, after flowing through the refrigerant flow channel, flows out through the first outlet to enter the liquid storage chamber for liquid storage, thereby achieving a liquid storage effect. External medium enters the second inlet through the medium inlet and, after flowing through the medium flow channel, flows out through the second outlet to the medium outlet. The liquid storage tank is directly connected to the heat exchange body, eliminating complex connecting piping, integrating the heat exchange and liquid storage functions into one, simplifying the structure and processing, thereby reducing the production cost of the heat pump system. Furthermore, the integrated structure reduces the overall space occupied by the heat pump system, facilitating miniaturization of the heat pump system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a plate heat exchanger provided in an embodiment of the present utility model;

[0020] Figure 2 Schematic diagram of the structure disassembly of the plate heat exchanger provided in the embodiment of the utility model Figure 1 ;

[0021] Figure 3 Schematic diagram of the structure disassembly of the plate heat exchanger provided in the embodiment of the utility model Figure 2 ;

[0022] Figure 4 A schematic structural diagram of a first heat exchange plate provided in an embodiment of the present utility model;

[0023] Figure 5 This is a schematic structural diagram of the second heat exchange plate provided in an embodiment of the present utility model.

[0024] Description of labels:

[0025] 1. Liquid storage tank; 11. Liquid storage chamber; 12. Refrigerant inlet; 13. Refrigerant outlet; 14. Medium inlet; 15. Medium outlet; 16. Front panel; 17. Rear panel; 171. First opening; 172. Second opening; 173. Third opening; 174. Fourth opening; 175. Third groove; 181. First conducting tube; 182. Second conducting tube; 183. Third conducting tube; 19. Side frame;

[0026] 2. Heat exchange body; 21. First heat exchange plate; 211. First inlet; 212. First outlet; 213. First groove; 214. First conduction hole; 215. Second conduction hole; 22. Second heat exchange plate; 221. Second inlet; 222. Second outlet; 223. Second groove; 224. Third conduction hole; 225. Fourth conduction hole;

[0027] 3. Back plate; 4. Drain pipe. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] In the description of this application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0032] like Figure 1-Figure 5 As shown, the embodiment of the present invention first provides a plate heat exchanger, which includes a liquid storage tank 1 and a heat exchange body 2. The heat exchange body 2 has a refrigerant flow channel and a medium flow channel for heat exchange, and the refrigerant and the medium exchange heat during the flow in their respective flow channels.

[0033] The liquid storage tank 1 has a liquid storage chamber 11, a refrigerant inlet 12, a refrigerant outlet 13, a medium inlet 14, and a medium outlet 15. The refrigerant outlet 13 is connected to the liquid storage chamber 11. The first inlet 211 of the refrigerant flow channel is connected to the refrigerant inlet 12, the first outlet 212 of the refrigerant flow channel is connected to the liquid storage chamber 11, the second inlet 221 of the medium flow channel is connected to the medium inlet 14, and the second outlet 222 of the medium flow channel is connected to the medium outlet 15. External refrigerant enters the first inlet 211 through the refrigerant inlet 12, flows through the refrigerant flow channel, and then flows out through the first outlet 212 to enter the liquid storage chamber 11 for liquid storage, achieving a liquid storage effect. External medium enters the second inlet 221 through the medium inlet 14, and after flowing through the medium flow channel, flows out of the medium outlet 15 through the second outlet 222. The liquid storage tank 1 is directly connected to the heat exchange body 2, eliminating complex connecting pipelines, integrating the heat exchange function and the liquid storage function into one, which is conducive to simplifying the structure and processing technology, thereby reducing production costs; moreover, the integrated structure reduces the occupied space and avoids being restricted to a small space environment.

[0034] Specifically, the plate heat exchanger realizes the liquid storage function through the drain pipe 4, such as Figure 3 As shown, the drain pipe 4 is arranged in the liquid storage chamber 11. One port of the drain pipe 4 is connected to the refrigerant outlet 13, and the height of the other port of the drain pipe 4 is higher than the height of the refrigerant outlet 13. When the liquid storage height in the liquid storage chamber 11 is greater than the height of the other port of the drain pipe 4, it indicates that the refrigerant storage in the liquid storage chamber 11 exceeds the set flow rate. At this time, the excess refrigerant will enter the drain pipe 4 through the other port of the drain pipe 4 and flow out from the refrigerant outlet 13, so that the liquid storage chamber 11 is connected to the external refrigerant pipeline, achieving the effect of buffering the refrigerant. When the liquid storage height in the liquid storage chamber 11 is less than the height of the other port of the drain pipe 4, no refrigerant enters the refrigerant outlet 13. It should be noted that, in this embodiment, the refrigerant is a liquid refrigerant. This embodiment does not limit the types of refrigerants and media.

[0035] Refrigerant outlet 13 is provided at the bottom of liquid storage tank 1, and the end of drain pipe 4, away from refrigerant outlet 13, extends along the height direction of liquid storage tank 1. For heat pump systems with different performance, the set flow rate of liquid storage chamber 11 can be adjusted by replacing drain pipe 4 of different lengths to ensure that the refrigerant flow rate meets the parameter requirements of the heat pump system.

[0036] The liquid storage tank 1 includes a side frame 19 and oppositely positioned front and rear panels 16, 17. The front and rear panels 16, 17 respectively cover the ends of the side frame 19 to form a liquid storage chamber 11. The refrigerant inlet 12, refrigerant outlet 13, medium inlet 14, and medium outlet 15 are all located on the front panel 16, while the heat exchange body 2 is connected to the outside of the rear panel 17, resulting in a relatively compact structure. The refrigerant inlet 12 and refrigerant outlet 13 are used to connect to external refrigerant pipelines, while the medium inlet 14 and medium outlet 15 are used to connect to external medium pipelines. Therefore, pipeline connections can be made from the front of the liquid storage tank 1 without interfering with the heat exchange body 2 behind the rear panel 17.

[0037] To achieve communication between the rear panel 17 and the heat exchange body 2, the rear panel 17 is provided with a first opening 171, a second opening 172, a third opening 173, and a fourth opening 174. The first opening 171 connects the first inlet 211 with the refrigerant inlet 12, guiding the flow of refrigerant before heat exchange; the second opening 172 connects the first outlet 212 with the liquid storage chamber 11, guiding the flow of refrigerant after heat exchange, forming a complete refrigerant flow path. The third opening 173 connects the second inlet 221 with the medium inlet 14, guiding the flow of medium before heat exchange; the fourth opening 174 connects the second outlet 222 with the medium outlet 15, guiding the flow of medium after heat exchange, forming a complete medium flow path.

[0038] To ensure that the refrigerant and the medium flow paths before and after heat exchange do not interfere with each other, the plate heat exchanger also includes a first conducting tube 181, a second conducting tube 182, and a third conducting tube 183, each of which is sandwiched between the front panel 16 and the rear panel 17. The two ends of the first conducting tube 181 respectively connect the refrigerant inlet 12 and the first opening 171, the two ends of the second conducting tube 182 respectively connect the medium inlet 14 and the third opening 173, and the two ends of the third conducting tube 183 respectively connect the medium outlet 15 and the fourth opening 174. The first conducting tube 181, the second conducting tube 182, and the third conducting tube 183 are isolated from the liquid storage chamber 11 to ensure that the medium does not enter the liquid storage chamber 11.

[0039] In order to provide protection for the heat exchange body 2, the plate heat exchanger further includes a back plate 3, which is connected to the other side of the heat exchange body 2 away from the rear panel 17. The heat exchange body 2 is sandwiched between the back plate 3 and the liquid storage tank 1, making heat exchange safer.

[0040] Specifically, the heat exchange body 2 includes a plurality of first heat exchange plates 21 and a plurality of second heat exchange plates 22. The front side of the first heat exchange plate 21 is provided with a first groove 213, and the front side of the second heat exchange plate 22 is provided with a second groove 223. When the plurality of first heat exchange plates 21 and the plurality of second heat exchange plates 22 are arranged in an alternating manner, the front side of the second heat exchange plate 22 is fitted and connected to the rear side of the adjacent first heat exchange plate 21 to close the second groove 223 to form a second branch flow channel. The plurality of second branch flow channels are connected in parallel to form a medium flow channel. Similarly, the front side of the first heat exchange plate 21 is fitted and connected to the rear side of the adjacent second heat exchange plate 22 to close the first groove 213 to form a first branch flow channel. The plurality of first branch flow channels are connected in parallel to form a refrigerant flow channel. The adjacent first heat exchange plates 21 and the second heat exchange plates 22 are connected by extrusion welding to ensure the sealing of the flow channel. Moreover, the adjacent first heat exchange plates 21 and the second heat exchange plates 22 do not need to be connected by pipes, further reducing the volume of the plate heat exchanger.

[0041] It should be noted that, since multiple first branch flow channels are connected in parallel to form a refrigerant flow channel, the first inlet 211 and the first outlet 212 of the refrigerant flow channel are provided on each first heat exchange plate 21, and the first inlet 211 and the first outlet 212 are respectively located at the two ends of the first groove 213. Similarly, since multiple second branch flow channels are connected in parallel to form a medium flow channel, the second inlet 221 and the second outlet 222 of the medium flow channel are provided on each second heat exchange plate 22, and the second inlet 221 and the second outlet 222 are respectively located at the two ends of the second groove 223.

[0042] Among the multiple first heat exchange plates 21, the front side of the preceding first heat exchange plate 21 is connected to the rear panel 17 that adheres to the liquid storage tank 1. The rear panel 17 seals the first groove 213 of the adjacent first heat exchange plate 21, forming a refrigerant flow path for the first heat exchange plate 21. That is, the heat exchange plate directly attached to the liquid storage chamber 11 is the first heat exchange plate 21, and the second heat exchange plate 22 is located behind the first heat exchange plate 21. Similarly, the first and second heat exchange plates 21, 22 are alternately arranged in sequence to ensure sufficient heat exchange between the refrigerant and the medium.

[0043] In one embodiment, a third groove 175 is formed on the inner side of the rear panel 17, which communicates with the liquid storage chamber 11. The rear panel 17 and the first and second heat exchange plates 21, 22 have similar structures, simplifying the manufacturing process. This embodiment does not limit the shapes of the first groove 213, the second groove 223, and the third groove 175.

[0044] In order to achieve uninterrupted and non-interfering flow of the refrigerant and the medium in the adjacent first heat exchange plate 21 and the second heat exchange plate 22, the first heat exchange plate 21 is provided with a first conduction hole 214 and a second conduction hole 215 penetrating along the thickness direction, and the first conduction hole 214, the second conduction hole 215 and the first groove 213 are isolated from each other and not connected. Specifically, the first conducting hole 214, the second conducting hole 215 and the first groove 213 are arranged in different areas. When the multiple first heat exchange plates 21 and the multiple second heat exchange plates 22 are staggered and fitted in sequence, the first groove 213 is sealed to form a first branch flow channel. The first conducting hole 214 and the second inlet 221 are correspondingly connected, and the second conducting hole 215 and the second outlet 222 are correspondingly connected. When the medium before heat exchange flows through the first conducting hole 214 of the first heat exchange plate 21, it will not enter the first branch flow channel, but will directly flow to the second inlet 221 of the second heat exchange plate 22 adjacent to the first heat exchange plate 21, and enter the second branch flow channel of the second heat exchange plate 22; moreover, when the medium after heat exchange flows through the second conducting hole 215 of the first heat exchange plate 21, it will not enter the first branch flow channel, but will directly flow to the second outlet 222 of the second heat exchange plate 22 adjacent to the first heat exchange plate 21.

[0045] Similarly, the second heat exchange plate 22 is provided with a third conducting hole 224 and a fourth conducting hole 225 penetrating along the thickness direction, and the third conducting hole 224, the fourth conducting hole 225 and the medium flow channel are isolated from each other and not connected. Specifically, the third conducting hole 224, the fourth conducting hole 225 and the second groove 223 are arranged in different areas. When multiple first heat exchange plates 21 and multiple second heat exchange plates 22 are staggered and fitted in sequence, the second groove 223 is sealed to form a second branch flow channel. The third conducting hole 224 is correspondingly connected to the first inlet 211, and the fourth conducting hole 225 is correspondingly connected to the first outlet 212. When the refrigerant before heat exchange flows through the third conducting hole 224 of the second heat exchange plate 22, it will not enter the second branch flow channel, but will directly flow to the first inlet 211 of the first heat exchange plate 21 adjacent to the second heat exchange plate 22, and enter the first branch flow channel of the first heat exchange plate 21; similarly, when the refrigerant after heat exchange flows through the fourth conducting hole 225 of the second heat exchange plate 22, it will not enter the second branch flow channel, but will directly flow to the first outlet 212 of the first heat exchange plate 21 adjacent to the second heat exchange plate 22.

[0046] In one embodiment, along the height direction of the first heat exchange plate 21, the first inlet 211 is located at the upper end of the first heat exchange plate 21, and the first outlet 212 is located at the lower end of the first heat exchange plate 21. Along the height direction of the second heat exchange plate 22, the second inlet 221 is located at the lower end of the second heat exchange plate 22, and the second outlet 222 is located at the upper end of the second heat exchange plate 22. That is, at the same height, the flow direction of the refrigerant and the flow direction of the medium are opposite, achieving countercurrent heat exchange and higher heat exchange efficiency. Figure 2The arrows in the middle indicate the flow directions of the refrigerant and the medium respectively.

[0047] The present invention also provides a heat pump system, which includes a refrigerant circulation pipeline and the plate heat exchanger described above. The refrigerant inlet 12 and the refrigerant outlet 13 of the plate heat exchanger are both connected to the refrigerant circulation pipeline. The liquid storage tank 1 of the plate heat exchanger has a liquid storage chamber 11, a refrigerant inlet 12, a refrigerant outlet 13, a medium inlet 14, and a medium outlet 15. The refrigerant outlet 13 is connected to the liquid storage chamber 11; the first inlet 211 of the refrigerant flow channel is connected to the refrigerant inlet 12, the first outlet 212 of the refrigerant flow channel is connected to the liquid storage chamber 11, the second inlet 221 of the medium flow channel is connected to the medium inlet 14, and the second outlet 222 of the medium flow channel is connected to the medium outlet 15. External refrigerant enters the first inlet 211 through the refrigerant inlet 12, and after flowing through the refrigerant flow channel, flows out from the first outlet 212 to enter the liquid storage chamber 11 for liquid storage, thereby achieving a liquid storage effect. External medium enters second inlet 221 through medium inlet 14 and, after flowing through the medium flow channel, exits medium outlet 15 through second outlet 222. Liquid storage tank 1 is directly connected to heat exchange body 2, eliminating complex connecting piping and integrating the heat exchange and liquid storage functions. This simplifies the structure and processing, thereby reducing the production cost of the heat pump system. Furthermore, the integrated structure reduces the overall space occupied by the heat pump system, facilitating its miniaturization.

[0048] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The specific contents of the above-mentioned specific embodiments only express several embodiments of the present invention. Although the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the appended claims.

Claims

1. Plate heat exchanger, characterized in that, The invention comprises a liquid storage tank (1) and a heat exchange body (2), wherein the heat exchange body (2) has a refrigerant flow channel and a medium flow channel for heat exchange, and the liquid storage tank (1) has a liquid storage chamber (11), a refrigerant inlet (12), a refrigerant outlet (13), a medium inlet (14), and a medium outlet (15), wherein the refrigerant outlet (13) is connected to the liquid storage chamber (11); the first inlet (211) of the refrigerant flow channel is connected to the refrigerant inlet (12), the first outlet (212) of the refrigerant flow channel is connected to the liquid storage chamber (11), the second inlet (221) of the medium flow channel is connected to the medium inlet (14), and the second outlet (222) of the medium flow channel is connected to the medium outlet (15).

2. The plate heat exchanger according to claim 1, characterized in that The plate heat exchanger further comprises a drain pipe (4), which is arranged in the liquid storage cavity (11), and one port of which is connected to the refrigerant outlet (13), and the height of the other port of the drain pipe (4) is higher than the height of the refrigerant outlet (13).

3. The plate heat exchanger according to claim 2, characterized in that The refrigerant outlet (13) is arranged at the bottom of the liquid storage chamber (11), and one end of the drain pipe (4) away from the refrigerant outlet (13) extends along the height direction of the liquid storage chamber (11).

4. The plate heat exchanger according to claim 1, characterized in that The liquid storage tank (1) includes a side frame (19) and a front panel (16) and a rear panel (17) that are arranged opposite to each other. The front panel (16) and the rear panel (17) are respectively covered on both ends of the side frame (19) to form the liquid storage cavity (11); the refrigerant inlet (12), the refrigerant outlet (13), the medium inlet (14) and the medium outlet (15) are all opened on the front panel (16), and the heat exchange body (2) is connected to the outer side of the rear panel (17).

5. The plate heat exchanger according to claim 4, characterized in that The rear panel (17) is provided with a first opening (171), a second opening (172), a third opening (173) and a fourth opening (174), wherein the first opening (171) corresponds to connecting the first inlet (211) with the refrigerant inlet (12), the second opening (172) corresponds to connecting the first outlet (212) with the liquid storage chamber (11), the third opening (173) corresponds to connecting the second inlet (221) with the medium inlet (14), and the fourth opening (174) corresponds to connecting the second outlet (222) with the medium outlet (15).

6. The plate heat exchanger according to claim 5, characterized in that The plate heat exchanger also includes a first conducting tube (181), a second conducting tube (182), and a third conducting tube (183), both ends of which are clamped and connected between the front panel (16) and the rear panel (17); the two ends of the first conducting tube (181) are respectively connected to the refrigerant inlet (12) and the first opening (171); the two ends of the second conducting tube (182) are respectively connected to the medium inlet (14) and the third opening (173); and the two ends of the third conducting tube (183) are respectively connected to the medium outlet (15) and the fourth opening (174).

7. The plate heat exchanger according to claim 4, characterized in that The plate heat exchanger further comprises a back plate (3), wherein the back plate (3) is connected to the other side of the heat exchange body (2) away from the rear panel (17).

8. The plate heat exchanger according to claim 4, characterized in that The inner side of the rear panel (17) is recessed to form a third groove (175).

9. The plate heat exchanger according to any one of claims 1 to 8, characterized in that: The heat exchange body (2) includes a plurality of first heat exchange plates (21) and a plurality of second heat exchange plates (22), the front side of the first heat exchange plate (21) is provided with a first groove (213), and the front side of the second heat exchange plate (22) is provided with a second groove (223). When the plurality of first heat exchange plates (21) and the plurality of second heat exchange plates (22) are arranged alternately in sequence, the front side of the second heat exchange plate (22) is fitted and connected to the rear side of the adjacent first heat exchange plate (21) to close the second groove (223) to form a second branch flow channel, and the plurality of second branch flow channels are connected in parallel to form the medium flow channel, the front side of the first heat exchange plate (21) is fitted and connected to the rear side of the adjacent second heat exchange plate (22) to close the first groove (213) to form a first branch flow channel, and the plurality of first branch flow channels are connected in parallel to form the refrigerant flow channel.

10. A heat pump system, characterized in that It comprises a refrigerant circulation pipeline and a plate heat exchanger according to any one of claims 1 to 9, wherein the refrigerant inlet (12) and the refrigerant outlet (13) of the plate heat exchanger are both connected to the refrigerant circulation pipeline.

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