Plate heat exchanger and heat exchange system

Abstract

The utility model provides a kind of plate heat exchanger and heat exchange system, plate heat exchanger includes multiple first heat exchange sheet and multiple second heat exchange sheet, the center of the first welding surface of the first protrusion of first heat exchange sheet and the second welding surface of the second protrusion of second heat exchange sheet corresponding contact welding to form first fluid passage, the center of the third welding surface of the first recess of first heat exchange sheet and the fourth welding surface of the second recess of second heat exchange sheet corresponding contact welding to form second fluid passage;The area of first welding surface and second welding surface is different to form local coincident welding, and / or, the area of third welding surface and fourth welding surface is different to form local coincident welding.The utility model plate heat exchanger can effectively reduce flow resistance, enhance the effect of turbulence, to improve heat exchange efficiency and heat exchange effect, to further improve heat exchange performance.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, and in particular to a plate heat exchanger and a heat exchange system having the plate heat exchanger. Background Technology

[0002] A plate heat exchanger is a high-efficiency heat exchanger composed of multiple metal heat exchange plates with a specific point-wave heat exchange structure. The point-wave heat exchange structures of adjacent heat exchange plates form staggered fluid channels, allowing cold and hot fluids to flow within these channels respectively, thus exchanging heat. Plate heat exchangers are characterized by high heat exchange efficiency, light weight, small footprint, compact structure, and long service life, and are widely used in fields including refrigeration and heating, waste heat recovery, chemical industry, aerospace, power, shipbuilding, and automotive batteries, demonstrating a large market and promising development prospects.

[0003] In plate heat exchangers, a fluid channel is formed between two adjacent heat exchange plates by welding the contact surfaces of their point-wave heat exchange structures. However, in existing plate heat exchangers, the corresponding matching weld surfaces of adjacent heat exchange plates have the same area. This results in a completely overlapping contact weld between the matching weld surfaces of one heat exchange plate and the matching weld surface of the other. This completely overlapping contact weld significantly hinders the flow of fluid within the fluid channel, substantially increasing flow resistance and thus affecting heat exchange efficiency and performance. Summary of the Invention

[0004] To achieve the primary objective of this invention, a plate heat exchanger is provided that can effectively reduce flow resistance, enhance turbulence, thereby improving heat exchange efficiency and effect, and ultimately enhancing heat exchange performance.

[0005] To achieve the second objective of this utility model, this utility model provides a heat exchange system having the above-mentioned plate heat exchanger.

[0006] To achieve the first objective of this utility model, it provides a plate heat exchanger comprising multiple first heat exchange plates and multiple second heat exchange plates. The first and second heat exchange plates are alternately stacked in the height direction of the plate heat exchanger. Each first heat exchange plate includes multiple first heat exchange groups and multiple second heat exchange groups, which are alternately arranged in the length direction of the plate heat exchanger. Each first heat exchange group includes multiple first protrusions, and each second heat exchange group includes multiple first recesses. The multiple first recesses and multiple first protrusions are alternately arranged in the width direction of the plate heat exchanger. Furthermore, each second heat exchange plate includes multiple third heat exchange groups and multiple fourth heat exchange groups. The heat exchange group, the third heat exchange group, and the fourth heat exchange group are arranged alternately in the length direction. The third heat exchange group includes multiple second protrusions, and the fourth heat exchange group includes multiple second depressions. The multiple second depressions and the multiple second protrusions are arranged alternately in the width direction. The center of the first welding surface of the first protrusion and the center of the center of the second welding surface of the second protrusion are contacted and welded to form a first fluid channel. The center of the center of the third welding surface of the first depression and the center of the center of the center of the center of the center of the fourth welding surface of the second depression are contacted and welded to form a second fluid channel. The areas of the first welding surface and the second welding surface are different to form a partially overlapping weld, and / or the areas of the third welding surface and the fourth welding surface are different to form a partially overlapping weld.

[0007] As can be seen from the above scheme, in the plate heat exchanger of this utility model, multiple first heat exchange plates and multiple second heat exchange plates are alternately stacked in the height direction of the plate heat exchanger. The first welding surface of the first protrusion of adjacent first heat exchange plates is welded to the center of the second welding surface of the second protrusion of the second heat exchange plate to form a first fluid channel. Additionally, the third welding surface of the first recess of adjacent first heat exchange plates is welded to the center of the fourth welding surface of the second recess of the second heat exchange plate to form a second fluid channel. Because the areas of the first welding surface of the first protrusion of the first heat exchange plate and the second welding surface of the second protrusion of the second heat exchange plate are different, a partial overlap welding is formed between the first welding surface and the second welding surface. And / or, the areas of the third welding surface of the first recess of the first heat exchange plate and the fourth welding surface of the second recess of the second heat exchange plate are different, resulting in a partial overlap welding between the third welding surface and the fourth welding surface. Therefore, compared to the existing completely overlapping contact welding, the adjacent first heat exchange plates and second heat exchange plates of the plate heat exchanger of this utility model have a higher center of gravity. The partial overlap of welding areas caused by different welding areas can reduce the flow resistance in the fluid channel by more than 20%, thereby increasing the flow rate of the fluid medium in the fluid channel. The non-overlapping area formed between adjacent first and second heat exchange plates due to the different welding areas can disturb the fluid medium in the fluid channel. After the fluid medium flows around the partially overlapped welding area, the turbulence and diversion effect of the non-overlapping area is conducive to the uniform distribution of the fluid medium flow, thereby improving the heat exchange efficiency and heat exchange effect.

[0008] Therefore, the plate heat exchanger of this invention can effectively reduce flow resistance and enhance turbulence, thereby improving heat exchange efficiency and heat exchange effect, and thus enhancing heat exchange performance.

[0009] A further embodiment is that the surface of the first non-overlapping region between the first welding surface and the second welding surface is coated with first solder particles; and / or, the surface of the second non-overlapping region between the third welding surface and the fourth welding surface is coated with second solder particles.

[0010] A further option is that the diameter of the first solder particle is less than or equal to 1 mm; and / or, the diameter of the second solder particle is less than or equal to 1 mm.

[0011] A further embodiment is that the partially overlapping welding area formed between the first welding surface and the second welding surface is a first partially overlapping area, and the area of ​​the first partially overlapping area is between 20% and 80% of the area of ​​the largest welding surface among the first welding surface and the second welding surface; and / or, the partially overlapping welding area formed between the third welding surface and the fourth welding surface is a second partially overlapping area, and the area of ​​the second partially overlapping area is between 20% and 80% of the area of ​​the largest welding surface among the third welding surface and the fourth welding surface.

[0012] A further option is that the first welding surface and the third welding surface have the same shape and area; and / or, the second welding surface and the fourth welding surface have the same shape and area.

[0013] A further option is that the first welding surface is one of the following: square, rectangle, circle, ellipse, triangle, rhombus, dumbbell, fan, S-shape, teardrop, and heart shape; and / or, the second welding surface is one of the following: square, rectangle, circle, ellipse, triangle, rhombus, dumbbell, fan, S-shape, teardrop, and heart shape; and / or, the third welding surface is one of the following: square, rectangle, circle, ellipse, triangle, rhombus, dumbbell, fan, S-shape, teardrop, and heart shape; and / or, the fourth welding surface is one of the following: square, rectangle, circle, ellipse, triangle, rhombus, dumbbell, fan, S-shape, teardrop, and heart shape.

[0014] A further option is that the first welding surface is a square, the second welding surface is a rectangle, and the shorter side of the second welding surface is equal to or greater than the side length of the first welding surface; and / or, the third welding surface is a square, the fourth welding surface is a rectangle, and the shorter side of the fourth welding surface is equal to or greater than the side length of the third welding surface.

[0015] A further embodiment is that the first welding surface is a rounded square, and the radius of each rounded corner of the first welding surface is between 1 / 8 and 1 / 2 of the side length of the first welding surface; and / or, the second welding surface is a rounded rectangle, and the radius of each rounded corner of the second welding surface is between 1 / 8 and 1 / 2 of the short side length of the second welding surface; and / or, the third welding surface is a rounded square, and the radius of each rounded corner of the third welding surface is between 1 / 8 and 1 / 2 of the side length of the third welding surface; and / or, the fourth welding surface is a rounded rectangle, and the radius of each rounded corner of the fourth welding surface is between 1 / 8 and 1 / 2 of the short side length of the fourth welding surface.

[0016] A further option is that the first welding surface is circular, the second welding surface is elliptical, and the minor axis of the second welding surface is equal to or greater than the diameter of the first welding surface; and / or, the third welding surface is circular, the fourth welding surface is elliptical, and the minor axis of the fourth welding surface is equal to or greater than the diameter of the third welding surface.

[0017] To achieve the second objective of this utility model, this utility model provides a heat exchange system, including a plate heat exchanger, wherein the plate heat exchanger is the aforementioned plate heat exchanger. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the first embodiment of the plate heat exchanger of this utility model.

[0019] Figure 2 This is a partial structural diagram of the plate heat exchanger of the present invention, showing the cooperation of multiple first heat exchange plates and multiple second heat exchange plates in the first embodiment.

[0020] Figure 3 This is a partial exploded view of the structure of the plate heat exchanger of this utility model in the first embodiment, showing the cooperation of multiple first heat exchange plates and multiple second heat exchange plates.

[0021] Figure 4 This is a partial front view of the structure of the plate heat exchanger of this utility model in the first embodiment, showing the cooperation of multiple first heat exchange plates and multiple second heat exchange plates.

[0022] Figure 5 yes Figure 4 Sectional view at AA.

[0023] Figure 6 yes Figure 5 Enlarged view at point B.

[0024] Figure 7 This is a schematic diagram of the structure of the first heat exchange plate and the second heat exchange plate in the first embodiment of the plate heat exchanger of this utility model.

[0025] Figure 8 This is a schematic diagram showing the partial overlap of the welding surfaces in the first embodiment of the plate heat exchanger of this utility model.

[0026] Figure 9 This is a partial structural front view of the first heat exchange plate in the first embodiment of the plate heat exchanger of this utility model.

[0027] Figure 10 This is a partial structural front view of the second heat exchange plate in the first embodiment of the plate heat exchanger of this utility model.

[0028] Figure 11 This is a schematic diagram of the first shape of the welding surface in the first embodiment of the plate heat exchanger of this utility model.

[0029] Figure 12 This is a schematic diagram of the second shape of the welding surface in the first embodiment of the plate heat exchanger of this utility model.

[0030] Figure 13This is a schematic diagram of the third shape of the welding surface in the first embodiment of the plate heat exchanger of this utility model.

[0031] Figure 14 This is a schematic diagram of the fourth shape of the welding surface in the first embodiment of the plate heat exchanger of this utility model.

[0032] Figure 15 This is a schematic diagram of the fifth shape of the welding surface in the first embodiment of the plate heat exchanger of this utility model.

[0033] Figure 16 This is a schematic diagram of the sixth shape of the welding surface in the first embodiment of the plate heat exchanger of this utility model.

[0034] Figure 17 This is a schematic diagram of the seventh shape of the welding surface in the first embodiment of the plate heat exchanger of this utility model.

[0035] Figure 18 This is a schematic diagram of the eighth shape of the welding surface in the first embodiment of the plate heat exchanger of this utility model.

[0036] Figure 19 This is a schematic diagram showing the partial overlap of the welding surfaces in the second embodiment of the plate heat exchanger of this utility model.

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0038] First embodiment of plate heat exchanger:

[0039] See Figures 1 to 10 This embodiment discloses a plate heat exchanger 10, including a plurality of first heat exchange plates 11, a plurality of second heat exchange plates 12, four connectors 15, an upper end plate 13 and a lower end plate 14. The plurality of first heat exchange plates 11 and the plurality of second heat exchange plates 12 are alternately stacked between the upper end plate 13 and the lower end plate 14 in the height direction Z of the plate heat exchanger 10, and the four connectors 15 are extended on the upper end plate 13.

[0040] In this embodiment, the first heat exchange plate 11 includes multiple first heat exchange groups and multiple second heat exchange groups, which are alternately arranged in the length direction Y of the plate heat exchanger 10. Each first heat exchange group includes multiple first protrusions 111, and each second heat exchange group includes multiple first recesses 112. The multiple first recesses 112 and the multiple first protrusions 111 are alternately arranged in the width direction X of the plate heat exchanger 10. Specifically, the protrusion direction of the first protrusions 111 and the concave direction of the first recesses 112 are opposite in the height direction Z.

[0041] Furthermore, in this embodiment, the second heat exchange plate 12 includes multiple third heat exchange groups and multiple fourth heat exchange groups, which are arranged alternately in the length direction Y. The third heat exchange groups include multiple second protrusions 121, and the fourth heat exchange groups include multiple second recesses 122. The multiple second recesses 122 and the multiple second protrusions 121 are arranged alternately in the width direction X. Specifically, the protrusion direction of the second protrusions 121 and the concave direction of the second recesses 122 are opposite in the height direction Z.

[0042] Therefore, in this embodiment, the plate heat exchanger 10 has a plurality of first heat exchange plates 11 and a plurality of second heat exchange plates 12 alternately stacked in the height direction Z of the plate heat exchanger 10. The first welding surface 1111 of the first protrusion 111 of the adjacent first heat exchange plate 11 and the center of the second welding surface 1211 of the second protrusion 121 of the second heat exchange plate 12 are correspondingly welded to form a first fluid channel 21. In addition, the third welding surface 1121 of the first recess 112 of the adjacent first heat exchange plate 11 and the center of the fourth welding surface 1221 of the second recess 122 of the second heat exchange plate 12 are correspondingly welded to form a second fluid channel 22.

[0043] Furthermore, in this embodiment, the areas of the first welding surface 1111 of the first protrusion 111 of the first heat exchange plate 11 and the second welding surface 1211 of the second protrusion 121 of the second heat exchange plate 12 are different, thereby forming a partial overlap weld between the first welding surface 1111 and the second welding surface 1211, and / or, in this embodiment, the areas of the third welding surface 1121 of the first recess 112 of the first heat exchange plate 11 and the fourth welding surface 1221 of the second recess 122 of the second heat exchange plate 12 are different, thereby forming a partial overlap weld between the third welding surface 1121 and the fourth welding surface 1221.

[0044] In this embodiment, the plate heat exchanger 10 is arranged in a way that alternatingly stacks a plurality of first heat exchange plates 11 and a plurality of second heat exchange plates 12 in the height direction Z of the plate heat exchanger 10. The first welding surface 1111 of the first protrusion 111 of the adjacent first heat exchange plate 11 is welded to the center of the second welding surface 1211 of the second protrusion 121 of the second heat exchange plate 12 to form a first fluid channel 21. In addition, the third welding surface 1121 of the first recess 112 of the adjacent first heat exchange plate 11 is welded to the center of the fourth welding surface 1221 of the second recess 122 of the second heat exchange plate 12 to form a second fluid channel 22. Because the areas of the first welding surface 1111 of the first protrusion 111 of the first heat exchange plate 11 and the second welding surface 1211 of the second protrusion 121 of the second heat exchange plate 12 are different, a partial overlap welding is formed between the first welding surface 1111 and the second welding surface 1211. And / or, because the areas of the third welding surface 1121 of the first recess 112 of the first heat exchange plate 11 and the fourth welding surface 1221 of the second recess 122 of the second heat exchange plate 12 are different, a partial overlap welding is formed between the third welding surface 1121 and the fourth welding surface 1221. Therefore, compared to the existing completely overlapping contact welding, the plate heat exchange plate of this embodiment... The partial overlap welding formed between adjacent first heat exchange plates 11 and second heat exchange plates 12 of the heat exchanger 10 due to the different welding areas can reduce the flow resistance in the fluid channel by more than 20%, thereby increasing the flow rate of the fluid medium in the fluid channel. The non-overlapping area formed between adjacent first heat exchange plates 11 and second heat exchange plates 12 due to the different welding areas can disturb the fluid medium in the fluid channel. After the fluid medium flows around the partially overlap welding area, the turbulence and diversion effect of the non-overlapping area is conducive to the uniform distribution of the flow rate of the fluid medium, thereby improving the heat exchange efficiency and heat exchange effect.

[0045] Therefore, the plate heat exchanger 10 in this embodiment can effectively reduce flow resistance and enhance turbulence, thereby improving heat exchange efficiency and heat exchange effect, and thus improving heat exchange performance.

[0046] To further improve heat exchange performance, in this embodiment, the surface of the first non-overlapping region 120 between the first welding surface 1111 and the second welding surface 1211 is coated with first solder particles, and the surface of the second non-overlapping region 110 between the third welding surface 1121 and the fourth welding surface 1221 is coated with second solder particles. Thus, the solder particles adhering to the surfaces of the non-overlapping regions at the welding surfaces can stimulate the nucleation boiling effect, improving heat exchange performance and further enhancing the overall heat exchange performance of the plate heat exchanger 10 in this embodiment by approximately 10%.

[0047] Specifically, in this embodiment, adjacent first heat exchange plates 11 and second heat exchange plates 12 of the plate heat exchanger 10 are welded by vacuum brazing. In this embodiment, the diameter of the first solder particles adhering to the surface of the first non-overlapping region 120 between the first welding surface 1111 and the second welding surface 1211 is less than or equal to 1 mm. Furthermore, in this embodiment, the diameter of the second solder particles adhering to the surface of the second non-overlapping region 110 between the third welding surface 1121 and the fourth welding surface 1221 is less than or equal to 1 mm. These small solder particles are typically spherical, irregular polygonal, or similar shapes, which can stimulate nucleation boiling and significantly improve heat exchange performance.

[0048] To further reduce flow resistance and enhance the turbulence effect, in this embodiment, the partially overlapping welding area formed between the first welding surface 1111 and the second welding surface 1211 is designated as the first partially overlapping area. The area of ​​the first partially overlapping area is between 20% and 80% of the area of ​​the largest welding surface among the first welding surface 1111 and the second welding surface 1211. Furthermore, in this embodiment, the partially overlapping welding area formed between the third welding surface 1121 and the fourth welding surface 1221 is designated as the second partially overlapping area. The area of ​​the second partially overlapping area is between 20% and 80% of the area of ​​the largest welding surface among the third welding surface 1121 and the fourth welding surface 1221.

[0049] See Figures 11 to 18 In this embodiment, the first welding surface 1111 of the first protrusion 111 is one of a square, rectangle, circle, ellipse 35, triangle 37, rhombus 33, dumbbell 34, fan 36, S-shape 31, teardrop 38, and heart 32. Similarly, the second welding surface 1211 of the second protrusion 121 in this embodiment is one of a square, rectangle, circle, ellipse 35, triangle 37, rhombus 33, dumbbell 34, fan 36, S-shape 31, teardrop 38, and heart 32. In this embodiment, the third welding surface 1121 of the first recess 112 is one of a square, rectangle, circle, ellipse 35, triangle 37, rhombus 33, dumbbell 34, fan 36, S-shape 31, teardrop 38, and heart 32. In this embodiment, the fourth welding surface 1221 of the second recess 122 is one of a square, rectangle, circle, ellipse 35, triangle 37, rhombus 33, dumbbell 34, fan 36, S-shape 31, teardrop 38, and heart 32.

[0050] Combination Figures 7 to 10In this embodiment, the first welding surface 1111 of the first protrusion 111 of the first heat exchange plate 11 is square, and the second welding surface 1211 of the second protrusion 121 of the second heat exchange plate 12 is rectangular. The short side length of the rectangular second welding surface 1211 is equal to or greater than the side length of the square first welding surface 1111, so that the area of ​​the rectangular second welding surface 1211 is greater than that of the square first welding surface 1111. Thus, the rectangular second welding surface 1211 and the square first welding surface 1111 are in center-corresponding contact welding to form a partially overlapping welding. The area of ​​the rectangular second welding surface 1211 protruding from the outer periphery of the square first welding surface 1111 forms the first non-overlapping area 120. Furthermore, in this embodiment, the third welding surface 1121 of the first recess 112 of the first heat exchange plate 11 is square, and the fourth welding surface 1221 of the second recess 122 of the second heat exchange plate 12 is rectangular. The shorter side of the rectangular fourth welding surface 1221 is equal to or greater than the side length of the square third welding surface 1121. Thus, the rectangular fourth welding surface 1221 and the square third welding surface 1121 are centrally correspondingly contacted and welded to form a partially overlapping weld. The area of ​​the rectangular fourth welding surface 1221 protruding from the outer periphery of the square third welding surface 1121 forms a second non-overlapping area 110.

[0051] Furthermore, in this embodiment, the first welding surface 1111 of the first protrusion 111 of the first heat exchange plate 11 and the third welding surface 1121 of the first recess 112 of the first heat exchange plate 11 have the same shape and area. In addition, in this embodiment, the second welding surface 1211 of the second protrusion 121 of the second heat exchange plate 12 and the fourth welding surface 1221 of the second recess 122 of the second heat exchange plate 12 have the same shape and area.

[0052] Preferably, in this embodiment, the first welding surface 1111 of the first protrusion 111 of the first heat exchange plate 11 is a rounded square, and the radius of each rounded corner of the first welding surface 1111 is between 1 / 8 and 1 / 2 times the side length of the first welding surface 1111, preferably 1 / 4 times; in this embodiment, the second welding surface 1211 of the second protrusion 121 of the second heat exchange plate 12 is a rounded rectangle, and the radius of each rounded corner of the second welding surface 1211 is between 1 / 8 and 1 / 2 times the short side length of the second welding surface 1211, preferably 1 / 4 times. The third welding surface 1121 of the first recess 112 of the first heat exchange plate 11 in this embodiment is a rounded square, and the radius of each rounded corner of the third welding surface 1121 is between 1 / 8 and 1 / 2 times the side length of the third welding surface 1121, preferably 1 / 4 times; the fourth welding surface 1221 of the second recess 122 of the second heat exchange plate 12 in this embodiment is a rounded rectangle, and the radius of each rounded corner of the fourth welding surface 1221 is between 1 / 8 and 1 / 2 times the short side length of the fourth welding surface 1221, preferably 1 / 4 times.

[0053] To improve the smoothness of fluid flow and further reduce flow resistance, in this embodiment, the first protrusion 111 and the first recess 112 of the first heat exchange plate 11 are connected by a smooth curved surface transition to ensure a smooth connection between the first welding surface 1111 of the first protrusion 111 and the third welding surface 1121 of the first recess 112, thereby reducing the risk of molding cracking and ensuring that multiple first protrusions 111 and multiple first recesses 112 are smoothly and continuously connected to form the whole of the first heat exchange plate 11. In this embodiment, the second protrusion 121 and the second recess 122 of the second heat exchange plate 12 are connected by a smooth curved surface transition to ensure a smooth connection between the second welding surface 1211 of the second protrusion 121 and the fourth welding surface 1221 of the second recess 122, thereby reducing the risk of molding cracking and ensuring that multiple second protrusions 121 and multiple second recesses 122 are smoothly and continuously connected to form the whole of the second heat exchange plate 12.

[0054] Second embodiment of plate heat exchanger:

[0055] As an explanation of the second embodiment of the plate heat exchanger of this utility model, the following description only focuses on the differences from the first embodiment of the plate heat exchanger.

[0056] See Figure 19 In this embodiment, the first welding surface 1111' is circular, and the second welding surface 1211' is elliptical. The minor axis of the second welding surface 1211' is equal to or greater than the diameter of the first welding surface 1111', making the area of ​​the elliptical second welding surface 1211' larger than that of the circular first welding surface 1111'. Thus, the elliptical second welding surface 1211' and the circular first welding surface 1111' are in center-corresponding contact welding to form a partially overlapping weld. The elliptical second welding surface 1211' protrudes beyond the outer periphery of the circular first welding surface 1111' to form a first non-overlapping region 120', which can effectively reduce flow resistance, enhance turbulence effect, thereby improving heat exchange efficiency and heat exchange effect, and thus improving heat exchange performance.

[0057] Furthermore, in this embodiment, the third welding surface 1121' is circular, and the fourth welding surface 1221' is elliptical. The minor axis of the fourth welding surface 1221' is equal to or greater than the diameter of the third welding surface 1121'. Thus, the elliptical fourth welding surface 1221' and the circular third welding surface 1121' are centrally contacted and welded to form a partially overlapping weld. The elliptical fourth welding surface 1221' protrudes from the outer periphery of the circular third welding surface 1121' to form a second non-overlapping region 110', which can effectively reduce flow resistance, enhance turbulence effect, thereby improving heat exchange efficiency and heat exchange effect, and thus improving heat exchange performance.

[0058] The above embodiments are merely preferred examples of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles of this utility model patent application should be included within the scope of this utility model patent application.

Claims

1. A plate heat exchanger, comprising a plurality of first heat exchange plates and a plurality of second heat exchange plates, wherein the first heat exchange plates and the second heat exchange plates are alternately stacked in the height direction of the plate heat exchanger, characterized in that: The first heat exchange plate includes multiple first heat exchange groups and multiple second heat exchange groups, which are alternately arranged along the length direction of the plate heat exchanger. The first heat exchange group includes multiple first protrusions, and the second heat exchange group includes multiple first recesses. The multiple first recesses and multiple first protrusions are alternately arranged along the width direction of the plate heat exchanger. The second heat exchange plate also includes multiple third heat exchange groups and multiple fourth heat exchange groups, which are alternately arranged along the length direction. The third heat exchange group includes multiple second protrusions, and the fourth heat exchange group includes multiple second recesses. The multiple second recesses and multiple second protrusions are alternately arranged along the width direction. The first welding surface of the first protrusion and the center of the second welding surface of the second protrusion are welded together to form a first fluid channel; the center of the third welding surface of the first depression and the center of the fourth welding surface of the second depression are welded together to form a second fluid channel; the areas of the first welding surface and the second welding surface are different to form a partially overlapping weld, and / or the areas of the third welding surface and the fourth welding surface are different to form a partially overlapping weld.

2. The plate heat exchanger according to claim 1, characterized in that: The surface of the first non-overlapping region between the first welding surface and the second welding surface is coated with first solder particles; And / or, the surface of the second non-overlapping region between the third welding surface and the fourth welding surface is coated with second solder particles.

3. The plate heat exchanger according to claim 2, characterized in that: The diameter of the first solder particle is less than or equal to 1 millimeter; And / or, the diameter of the second solder particle is less than or equal to 1 mm.

4. The plate heat exchanger according to claim 1, characterized in that: The partially overlapping welding area formed between the first welding surface and the second welding surface is called the first partially overlapping area. The area of ​​the first partially overlapping area is between 20% and 80% of the area of ​​the largest welding surface among the first welding surface and the second welding surface. And / or, the partially overlapping welding area formed between the third welding surface and the fourth welding surface is a second partially overlapping area, and the area of ​​the second partially overlapping area is between 20% and 80% of the area of ​​the largest welding surface among the third welding surface and the fourth welding surface.

5. The plate heat exchanger according to claim 1, characterized in that: The first welding surface and the third welding surface have the same shape and area; And / or, the second welding surface and the fourth welding surface have the same shape and area.

6. The plate heat exchanger according to claim 1, characterized in that: The first welding surface is one of the following: square, rectangle, circle, ellipse, triangle, rhombus, dumbbell, fan, S-shape, teardrop, and heart shape; And / or, the second welding surface is one of the following: square, rectangle, circle, ellipse, triangle, rhombus, dumbbell, fan, S-shape, teardrop, and heart shape; And / or, the third welding surface is one of the following: square, rectangle, circle, ellipse, triangle, rhombus, dumbbell, fan, S-shape, teardrop, and heart shape; And / or, the fourth welding surface is one of the following shapes: square, rectangle, circle, ellipse, triangle, rhombus, dumbbell, fan, S-shape, teardrop, and heart.

7. The plate heat exchanger according to any one of claims 1 to 6, characterized in that: The first welding surface is a square, the second welding surface is a rectangle, and the shorter side of the second welding surface is equal to or greater than the side length of the first welding surface. And / or, the third welding surface is a square, the fourth welding surface is a rectangle, and the shorter side of the fourth welding surface is equal to or greater than the side length of the third welding surface.

8. The plate heat exchanger according to claim 7, characterized in that: The first welding surface is a rounded square, and the radius of each rounded corner of the first welding surface is between 1 / 8 and 1 / 2 of the side length of the first welding surface; and / or, the second welding surface is a rounded rectangle, and the radius of each rounded corner of the second welding surface is between 1 / 8 and 1 / 2 of the short side length of the second welding surface; And / or, the third welding surface is a rounded square, and the radius of each rounded corner of the third welding surface is between 1 / 8 and 1 / 2 of the side length of the third welding surface; and / or, the fourth welding surface is a rounded rectangle, and the radius of each rounded corner of the fourth welding surface is between 1 / 8 and 1 / 2 of the short side length of the fourth welding surface.

9. The plate heat exchanger according to any one of claims 1 to 6, characterized in that: The first welding surface is circular, the second welding surface is elliptical, and the minor axis of the second welding surface is equal to or greater than the diameter of the first welding surface; And / or, the third welding surface is circular, the fourth welding surface is elliptical, and the minor axis of the fourth welding surface is equal to or greater than the diameter of the third welding surface.

10. A heat exchange system, including a plate heat exchanger, characterized in that: The plate heat exchanger is any one of the plate heat exchangers described in claims 1 to 9.

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