Heat exchange plate, plate heat exchanger and heat exchange system
By designing specific micro-structures and local contact welding on the heat exchange plates, the problem of difficult processing and forming was solved, production efficiency and yield were improved, and the turbulence capacity and heat exchange performance were enhanced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-14
AI Technical Summary
In the existing heat exchange plate manufacturing process, the long side axis of the fourth convex-concave welding plane is relatively long, resulting in a large transition curvature between adjacent convex-concave structures. This increases the difficulty of manufacturing and affects production efficiency and yield.
Design a heat exchange plate that employs multiple micro-element structures. Each micro-element structure includes four turbulence protrusions, four corner protrusions, four central protrusions, one central protrusion, four first recesses, and eight second recesses. The long side axis of the turbulence protrusions is inclined to the length direction. The distance between the recesses and the turbulence protrusions is increased to reduce the transition curvature, and local contact welding is formed through copper foil solder.
It reduces the difficulty of processing and forming, improves production efficiency and yield, and enhances turbulence and heat exchange performance.
Smart Images
Figure CN224499234U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat exchange technology, and in particular to a heat exchange plate, a plate heat exchanger having the heat exchange plate, 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, and automotive batteries, demonstrating a large market and promising development prospects.
[0003] See Figure 1 The existing heat exchange plate is composed of multiple quadrilateral micro-element units 10 arranged in the length direction Y and the width direction X. Each quadrilateral micro-element unit 10 has a first convex and concave welding plane 11 at each of its four corners. A second convex and concave welding plane 12 is provided in the middle of two adjacent first convex and concave welding planes 11 in the length direction Y. A third convex and concave welding plane 13 is provided in the middle of two adjacent first convex and concave welding planes 11 in the width direction X. A fourth convex and concave welding plane 14 is provided in the center of the quadrilateral micro-element unit 10. Since the fourth convex and concave welding plane 14 has a long side axis and a short side axis, for example, the fourth convex and concave welding plane 14 is elliptical, and the long side axis of the fourth convex and concave welding plane 14 has an inclined angle with the length direction Y.
[0004] Because the long axis of the fourth convex-concave welding plane 14 is relatively long, the second convex-concave welding plane 12, located in the middle of two adjacent first convex-concave welding planes 11 in the length direction Y, is relatively close to the long axis of the fourth convex-concave welding plane 14. Similarly, the third convex-concave welding plane 13, located in the middle of two adjacent first convex-concave welding planes 11 in the width direction X, is also relatively close to the long axis of the fourth convex-concave welding plane 14. This results in a large curvature of the transition surfaces formed between the second convex-concave welding plane 12, the third convex-concave welding plane 13, and the fourth convex-concave welding plane 14, which is not conducive to processing and forming. This leads to greater processing and forming production difficulty, affects processing and forming production efficiency, and consequently affects processing and forming effect and yield. Summary of the Invention
[0005] To achieve the primary objective of this utility model, it provides a heat exchange plate that can effectively reduce the transition curvature between adjacent convex and concave structures, thereby reducing the difficulty of processing and forming, improving the efficiency of processing and forming, and thus improving the processing and forming effect and yield rate. It can also enhance the turbulence capability to improve heat exchange performance.
[0006] To achieve the second objective of this utility model, this utility model provides a plate heat exchanger having the above-mentioned heat exchange plates.
[0007] To achieve the third objective of this utility model, this utility model provides a heat exchange system having the above-mentioned plate heat exchanger.
[0008] To achieve the primary objective of this invention, a heat exchange plate is provided, comprising multiple micro-element structures arranged side-by-side along the length and width of the heat exchange plate. Each micro-element structure is quadrilateral in shape and includes four turbulence protrusions, four corner protrusions, four central protrusions, one central protrusion, four first recesses, and eight second recesses. The protrusion directions and heights of the turbulence protrusions, corner protrusions, central protrusions, and central protrusions are identical. The concave directions and heights of the first and second recesses are identical. The first welding surface of the turbulence protrusions has a long axis and a short axis that are perpendicular to each other. The axis has an inclined angle between the long side axis and the length direction. Four corner protrusions are located at the four corners of the micro-element structure. A central protrusion is set in the middle between two adjacent corner protrusions. The central protrusion is located at the center of the micro-element structure. A corner protrusion and its two adjacent central protrusions and the central protrusion form a quadrilateral micro-element unit. A turbulence protrusion is located at the center of a micro-element unit. Four first recesses are located on both sides of the central protrusion in the length and width directions, respectively, and are located close to the central protrusion. Two second recesses are located on the outer periphery of a micro-element unit in the length and width directions, respectively, and are located close to the corner protrusion.
[0009] As can be seen from the above scheme, each quadrilateral micro-element structure of the heat exchange plate of this utility model has four micro-element units arranged in a quadrilateral shape. A quadrilateral micro-element unit is formed by a corner protrusion, two adjacent middle protrusions, and a central protrusion. A turbulence protrusion is located at the center of a quadrilateral micro-element unit, and the first welding surface of the turbulence protrusion has a long side axis and a short side axis arranged perpendicularly to each other. The long side axis has an inclined angle with the length direction. Furthermore, in the same quadrilateral micro-element structure, the heat exchange plate of this utility model has four first recesses located on both sides of the central protrusion in the length and width directions, respectively, close to the central protrusion. Additionally, two first recesses located on the outer periphery of a micro-element unit in the length and width directions are also present. The second recess is positioned close to the corner protrusion, thereby causing the first and second recesses located on the periphery of a quadrilateral micro-element unit to be far away from the long axis of the first welding surface of the turbulence protrusion. This increases the distance between the first and second recesses and the long axis of the first welding surface of the turbulence protrusion, effectively reducing the transition curvature between adjacent convex and concave structures, thus reducing the difficulty of processing and forming, improving processing and forming efficiency, and ultimately improving the processing and forming effect and yield. Furthermore, the fact that the first and second recesses located on the periphery of a quadrilateral micro-element unit are far away from the long axis of the first welding surface of the turbulence protrusion can effectively disturb the fluid medium, thereby improving the turbulence capability and heat transfer performance.
[0010] A further option is to have four first recesses located on both sides of the central protrusion in the length and width directions respectively, positioned close to the central protrusion at a first interval, and two second recesses located on the outer periphery of a micro-element in the length and width directions respectively, positioned close to the corner protrusion at a second interval.
[0011] A further proposed solution is to make the second spacing equal to the first spacing.
[0012] A further approach is to arrange two adjacent first welding surfaces in the width direction symmetrically about the central protrusion within the same micro-element structure.
[0013] A further approach is that, in the width direction, the area of the multiple first welding surfaces gradually decreases from one side of the heat exchange plate toward the other side.
[0014] A further embodiment is that the shape and area of the second welding surface protruding at the corner, the third welding surface protruding in the middle, and the fourth welding surface protruding in the center are all different; and / or, the shape and area of the fifth welding surface of the first recess and the sixth welding surface of the second recess are all different.
[0015] A further option is that the fourth welding surface is one of the following shapes: rounded square, circle, ellipse, or rounded rhombus; and / or, the fifth welding surface is one of the following shapes: rounded square, circle, ellipse, or rounded rhombus.
[0016] A further option is that the first welding surface is one of the following shapes: ellipse, rounded rectangle, or rounded rhombus.
[0017] To achieve the second objective of this utility model, this utility model provides a plate heat exchanger, including at least three heat exchange plates, wherein the heat exchange plates are those described above.
[0018] Multiple heat exchange plates are stacked along the height of the plate heat exchanger. In three adjacent heat exchange plates, the first welding surface of the first heat exchange plate intersects with the first welding surface of the second heat exchange plate to form partial contact, and the corner protrusions of the first heat exchange plate are in full contact with the corner protrusions of the second heat exchange plate, the central protrusion of the first heat exchange plate is in full contact with the central protrusion of the second heat exchange plate, and the central protrusion of the first heat exchange plate is in full contact with the central protrusion of the second heat exchange plate to form a first fluid channel; the first recess of the second heat exchange plate is in full contact with the first recess of the third heat exchange plate, and the second recess of the second heat exchange plate is in full contact with the second recess of the third heat exchange plate to form a second fluid channel.
[0019] Alternatively, multiple heat exchange plates are stacked along the height of the plate heat exchanger. In three adjacent heat exchange plates, the first welding surface of the first heat exchange plate is in complete contact with the first welding surface of the second heat exchange plate, and the corner protrusions of the first heat exchange plate are in complete contact with the corner protrusions of the second heat exchange plate, the central protrusion of the first heat exchange plate is in complete contact with the central protrusion of the second heat exchange plate, and the central protrusion of the first heat exchange plate is in complete contact with the central protrusion of the second heat exchange plate, to form a first fluid channel; the first recess of the second heat exchange plate is in complete contact with the first recess of the third heat exchange plate, and the second recess of the second heat exchange plate is in complete contact with the second recess of the third heat exchange plate, to form a second fluid channel.
[0020] To achieve the third 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 plate heat exchanger described above. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of a micro-element unit of an existing heat exchange plate.
[0022] Figure 2 This is a structural diagram of the first embodiment of the plate heat exchanger of this utility model.
[0023] Figure 3 This is an exploded view of the first embodiment of the plate heat exchanger of this utility model.
[0024] Figure 4 This is a front view of the first embodiment of the plate heat exchanger of this utility model.
[0025] Figure 5 yes Figure 4 Enlarged view at point AA.
[0026] Figure 6 yes Figure 4 A magnified view at BB.
[0027] Figure 7 This is a schematic diagram of the welding surfaces of the micro-element structure in the first embodiment of the plate heat exchanger of this utility model.
[0028] Figure 8 This is a schematic diagram of the welding surfaces of the micro-element structure in the first embodiment of the plate heat exchanger of this utility model, representing a second implementation method.
[0029] Figure 9 This is a schematic diagram of the welding surfaces of the micro-element structure in the first embodiment of the plate heat exchanger of this utility model, in a third embodiment.
[0030] Figure 10 This is a schematic diagram of the welding surfaces of the micro-element structure in the first embodiment of the plate heat exchanger of this utility model, representing the fourth implementation method.
[0031] Figure 11 This is a schematic diagram of the fifth embodiment of the welding surfaces of the micro-element structure in the first embodiment of the plate heat exchanger of this utility model.
[0032] Figure 12 This is an exploded view of the second embodiment of the plate heat exchanger of this utility model.
[0033] Figure 13 This is a front view of the second embodiment of the plate heat exchanger of this utility model.
[0034] Figure 14 yes Figure 13 Enlarged view at CC.
[0035] Figure 15 This is a schematic diagram of the micro-element structure in the third embodiment of the plate heat exchanger of this utility model.
[0036] Figure 16 This is a schematic diagram of the micro-element structure in the fourth 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 2 to 7This embodiment discloses a plate heat exchanger 20, which includes at least three heat exchange plates 21, and the multiple heat exchange plates 21 are stacked in the height direction Z of the plate heat exchanger 20.
[0040] In this embodiment, the heat exchange plate 21 is provided with multiple micro-element structures, which are arranged side by side in the length direction Y and the width direction X of the heat exchange plate 21. Each micro-element structure is quadrilateral in shape and includes four turbulence protrusions 211, four corner protrusions 212, four central protrusions 213, one central protrusion 214, four first recesses 215, and eight second recesses 216. The protrusion direction and height of the protrusion 214 are the same. The concave direction and height of the first recess 215 and the second recess 216 are the same. The concave direction of the first recess 215 is opposite to the protrusion direction of the turbulence protrusion 211 in the height direction Z of the heat exchange plate 21. The first welding surface 2111 of the turbulence protrusion 211 away from the first recess 215 has a long side shaft 21111 and a short side shaft 21112 that are perpendicular to each other. The long side shaft 21111 has an inclined angle with the length direction Y.
[0041] Furthermore, in this embodiment, the four corner protrusions 212 are respectively located at the four corners of the micro-element structure. A central protrusion 213 is provided in the middle between two adjacent corner protrusions 212. The central protrusion 214 is located at the center of the micro-element structure. A corner protrusion 212, its two adjacent central protrusions 213, and the central protrusion 214 form a quadrilateral micro-element unit. A turbulence protrusion 211 is located at the center of a micro-element unit. Four first recesses 215 located on both sides of the central protrusion 214 in the length direction Y and the width direction X are provided close to the central protrusion 214. Two second recesses 216 located on the outer periphery of a micro-element unit in the length direction Y and the width direction X are provided close to the corner protrusions 212.
[0042] Therefore, in this embodiment, each quadrilateral micro-element structure of the heat exchange plate 21 has four quadrilaterally arranged micro-element units. A quadrilateral micro-element unit is formed by a corner protrusion 212, two adjacent middle protrusions 213, and a central protrusion 214. A turbulence protrusion 211 is located at the center of a quadrilateral micro-element unit, and the first welding surface 2111 of the turbulence protrusion 211 has a long side axis 21111 and a short side axis 21112 that are perpendicular to each other. The long side axis 21111 has an inclined angle with the length direction Y. In addition, in the same quadrilateral micro-element structure, in this embodiment, four first recesses 215 located on both sides of the central protrusion 214 in the length direction Y and the width direction X are arranged close to the central protrusion 214, and two second recesses 216 located on the outer periphery of a micro-element unit in the length direction Y and the width direction X are respectively located near the central protrusion 214. The protrusions 212 are positioned close to the corner, so that the first recesses 215 and 216 on the periphery of a quadrilateral micro-element unit are respectively far away from the long axis 21111 of the first welding surface 2111 of the turbulence protrusion 211. This increases the distance between the first recesses 215 and 216 and the long axis 21111 of the first welding surface 2111 of the turbulence protrusion 211, thereby effectively reducing the transition curvature between adjacent protrusions and recesses, reducing the difficulty of processing and forming, improving the efficiency of processing and forming, and thus improving the processing and forming effect and yield. Furthermore, the fact that the first recesses 215 and 216 on the periphery of a quadrilateral micro-element unit are far away from the long axis 21111 of the first welding surface 2111 of the turbulence protrusion 211 can effectively turbulentize the fluid medium, thereby improving the turbulence capability and heat transfer performance.
[0043] Specifically, in this embodiment, in the plate heat exchanger 20, among its three adjacent heat exchange plates 21, the first welding surface 2111 of the first heat exchange plate 21 intersects with the first welding surface 2111 of the second heat exchange plate 21 to form partial contact, and the corner protrusion 212 of the first heat exchange plate 21 is in full contact with the corner protrusion 212 of the second heat exchange plate 21, the middle protrusion 213 of the first heat exchange plate 21 is in full contact with the middle protrusion 213 of the second heat exchange plate 21, and the central protrusion 214 of the first heat exchange plate 21 is in full contact with the central protrusion 214 of the second heat exchange plate 21, so as to form a first fluid channel 22; the first recess 215 of the second heat exchange plate 21 is in full contact with the first recess 215 of the third heat exchange plate 21, and the second recess 216 of the second heat exchange plate 21 is in full contact with the second recess 216 of the third heat exchange plate 21, so as to form a second fluid channel 23. Therefore, in this embodiment, the first welding surfaces 2111 of two adjacent heat exchange plates 21 of the plate heat exchanger 20 can be welded together to form a partial contact weld, which can greatly reduce the dead zone area and further increase the effective heat exchange area. Simulation calculations have shown that the heat exchange capacity of the non-complete contact welding form is increased by about 15% based on the complete contact welding form. At the same time, the non-complete contact welding form can reduce the pressure loss, and the non-contact area between the first welding surfaces 2111 of two adjacent heat exchange plates 21 can disturb the fluid medium in multiple directions, thereby further improving the uniformity of the fluid medium's flow velocity in the width direction X and the length direction Y.
[0044] Furthermore, in this embodiment, copper foil solder is placed at the partial contact points between the first welding surface 2111 of the first heat exchange plate 21 and the first welding surface 2111 of the second heat exchange plate 21; copper foil solder is placed at all contact points between the corner protrusion 212 of the first heat exchange plate 21 and the corner protrusion 212 of the second heat exchange plate 21; copper foil solder is placed at all contact points between the central protrusion 213 of the first heat exchange plate 21 and the central protrusion 213 of the second heat exchange plate 21; and copper foil solder is placed at all contact points between the central protrusion 214 of the first heat exchange plate 21 and the second heat exchange plate 21. Copper foil solder is placed at all contact points of the central protrusion 214 of the hot plate 21, copper foil solder is placed at all contact points of the first recess 215 of the second heat exchange plate 21 and the first recess 215 of the third heat exchange plate 21, and copper foil solder is placed at all contact points of the second recess 216 of the second heat exchange plate 21 and the second recess 216 of the third heat exchange plate 21. The copper foil solder is melted at high temperature using vacuum brazing to form an integrated plate heat exchanger 20, thereby forming a first fluid channel 22 and a second fluid channel 23. The heat exchange medium, such as refrigerant, flows through the first fluid channel 22, while the heat exchange medium, such as water, flows through the second fluid channel 23.
[0045] To further reduce the transition curvature between adjacent convex and concave structures and thus reduce the difficulty of processing and forming, this embodiment has four first recesses 215 located on both sides of the central protrusion 214 in the length direction Y and width direction X, respectively, close to the central protrusion 214 with a first spacing H1. Furthermore, this embodiment has two second recesses 216 located on the outer periphery of a micro-element in the length direction Y and width direction X, respectively, close to the corner protrusion 212 with a second spacing H2. Preferably, in this embodiment, the second spacing H2 is equal to the first spacing H1, thereby further reducing the transition curvature between adjacent convex and concave structures and further reducing the difficulty of processing and forming.
[0046] To further enhance the turbulence-causing capacity and thus improve heat exchange performance, in this embodiment, the second welding surface 2121 of the corner protrusion 212 which is away from the first recess 215, the third welding surface 2131 of the middle protrusion 213 which is away from the first recess 215, and the fourth welding surface 2141 of the center protrusion 214 which is away from the first recess 215 all have different shapes and areas. Furthermore, in this embodiment, the fifth welding surface 2151 of the first recess 215 which is away from the turbulence-causing protrusion 211 and the sixth welding surface 2161 of the second recess 216 which is away from the turbulence-causing protrusion 211 all have different shapes and areas.
[0047] In this embodiment, the first welding surface 2111 of the turbulence protrusion 211 is one of the shapes of ellipse, rounded rectangle, and rounded rhombus. In this embodiment, the fourth welding surface 2141 of the central protrusion 214 is one of the shapes of rounded square, circle, ellipse, and rounded rhombus. In this embodiment, the fifth welding surface 2151 of the first recess 215 is one of the shapes of rounded square, circle, ellipse, and rounded rhombus.
[0048] Combination Figure 7 In the first embodiment of the welding surfaces of the micro-element structure, the first welding surface 2111 of the turbulence protrusion 211 is elliptical, the fourth welding surface 2141 of the central protrusion 214 is a rounded square, and the fifth welding surface 2151 of the first recess 215 is circular.
[0049] Combination Figure 8 In the second embodiment of the welding surfaces of the micro-element structure, the first welding surface 2112 of the turbulence protrusion 211 is elliptical, the fourth welding surface 2142 of the central protrusion 214 is a rounded square, and the fifth welding surface 2152 of the first recess 215 is a rounded rhombus.
[0050] Combination Figure 9 In the third embodiment of the welding surfaces of the micro-element structure, the first welding surface 2113 of the turbulence protrusion 211 is elliptical, the fourth welding surface 2143 of the central protrusion 214 is a rounded rectangle, and the fifth welding surface 2153 of the first recess 215 is a rounded rhombus.
[0051] Combination Figure 10 In the fourth embodiment of the welding surfaces of the micro-element structure, the first welding surface 2114 of the turbulence protrusion 211 is a rounded rectangle, the fourth welding surface 2144 of the central protrusion 214 is a circle, and the fifth welding surface 2154 of the first recess 215 is a rounded rectangle.
[0052] Combination Figure 11 The fifth embodiment of the welding surfaces of the micro-element structure is as follows: In the fifth embodiment, the first welding surface 2115 of the turbulence protrusion 211 is a rounded rhombus, the fourth welding surface 2145 of the central protrusion 214 is an ellipse, and the fifth welding surface 2155 of the first recess 215 is a rounded rhombus.
[0053] Second embodiment of plate heat exchanger:
[0054] 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.
[0055] See Figures 12 to 14 In this embodiment, in the plate heat exchanger 20, among its three adjacent heat exchange plates 21, the first welding surface 2111 of the first heat exchange plate 21 is in complete contact with the first welding surface 2111 of the second heat exchange plate 21, and the corner protrusion 212 of the first heat exchange plate 21 is in complete contact with the corner protrusion 212 of the second heat exchange plate 21, the central protrusion 213 of the first heat exchange plate 21 is in complete contact with the central protrusion 213 of the second heat exchange plate 21, and the central protrusion 214 of the first heat exchange plate 21 is in complete contact with the central protrusion 214 of the second heat exchange plate 21, to form a first fluid channel 22'; the first recess 215 of the second heat exchange plate 21 is in complete contact with the first recess 215 of the third heat exchange plate 21, and the second recess 216 of the second heat exchange plate 21 is in complete contact with the second recess 216 of the third heat exchange plate 21, to form a second fluid channel 23'.
[0056] In this embodiment, the first welding surface 2111 of the turbulence protrusion 211 of two adjacent heat exchange plates 21, the second welding surface 2121 of the corner protrusion 212, the third welding surface 2131 of the middle protrusion 213, the fourth welding surface 2141 of the center protrusion 214, the fifth welding surface 2151 of the first recess 215, and the sixth welding surface 2161 of the second recess 216 are all in full contact welding, thereby improving the welding strength and stability between two adjacent heat exchange plates 21, and thus improving the overall structural strength of the plate heat exchanger 20, so as to improve the heat exchange efficiency.
[0057] Third embodiment of plate heat exchanger:
[0058] As an explanation of the third 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.
[0059] See Figure 15 In the same micro-element structure, the first welding surfaces 2111' of two adjacent turbulence protrusions 211 in the width direction X are symmetrically arranged about the central protrusion 214, so that the first welding surfaces 2111' of the two adjacent turbulence protrusions 211 in the width direction X are inclined in opposite directions / are separated, which can double the turbulence capability, thereby improving the uniformity of flow velocity distribution and thus doubling the heat transfer performance.
[0060] Fourth embodiment of plate heat exchanger:
[0061] As an explanation of the fourth 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.
[0062] See Figure 16 In the width direction X, the area of the multiple first welding surfaces 2111" gradually decreases from one side of the heat exchange plate 21 to the other side, so that the width of the fluid channel gradually increases from one side to the other in the width direction X. Therefore, the volume of the fluid channel gradually increases in the width direction X as the area of the first welding surfaces 2111" gradually decreases. This results in the fluid channel volume being smaller near the flow port and larger away from the flow port in the width direction X. As a result, the resistance of the fluid channel to the fluid medium gradually decreases from one side to the other in the width direction X. According to the fluid flow law, the fluid will tend to flow to the position with less flow resistance, thereby making the flow velocity of the fluid medium in the fluid channel uniformly distributed in the width direction X.
[0063] 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 heat exchange plate having multiple micro-element structures arranged side-by-side along the length and width directions of the heat exchange plate, each micro-element structure being quadrilateral in shape, characterized in that: Each of the micro-element structures includes four turbulence protrusions, four corner protrusions, four central protrusions, one central protrusion, four first recesses, and eight second recesses. The turbulence protrusions, corner protrusions, central protrusions, and central protrusions have the same protrusion direction and height. The first recesses and second recesses have the same recess direction and height. The first welding surface of the turbulence protrusion has a long side axis and a short side axis that are perpendicular to each other. The long side axis has an inclined angle with the length direction. The four corner protrusions are located at the four corners of the micro-element structure. A central protrusion is provided in the middle between two adjacent corner protrusions. The central protrusion is located at the center of the micro-element structure. A corner protrusion, its two adjacent central protrusions, and the central protrusion form a quadrilateral micro-element unit. A turbulence protrusion is located at the center of a micro-element unit. Four first recesses located on both sides of the central protrusion in the length and width directions are located close to the central protrusion. Two second recesses located on the outer periphery of a micro-element unit in the length and width directions are located close to the corner protrusion.
2. The heat exchange plate according to claim 1, characterized in that: The four first recesses located on both sides of the central protrusion in the length direction and the width direction are arranged close to the central protrusion at a first spacing, and the two second recesses located on the outer periphery of the micro-element in the length direction and the width direction are arranged close to the corner protrusion at a second spacing.
3. The heat exchange plate according to claim 2, characterized in that: The second spacing is equal to the first spacing.
4. The heat exchange plate according to claim 1, characterized in that: In the same micro-element structure, two adjacent first welding surfaces in the width direction are symmetrically arranged about the central protrusion.
5. The heat exchange plate according to claim 1, characterized in that: In the width direction, the area of the plurality of first welding surfaces gradually decreases from one side of the heat exchange plate toward the other side of the heat exchange plate.
6. The heat exchange plate according to claim 1, characterized in that: The shapes and areas of the second welding surface of the corner protrusion, the third welding surface of the middle protrusion, and the fourth welding surface of the center protrusion are all different; And / or, the fifth welding surface of the first recess and the sixth welding surface of the second recess have different shapes and areas.
7. The heat exchange plate according to claim 6, characterized in that: The fourth welding surface is one of the following shapes: rounded square, circle, ellipse, or rounded rhombus; And / or, the fifth welding surface is one of the following shapes: rounded square, circle, ellipse, or rounded rhombus.
8. The heat exchange plate according to any one of claims 1 to 7, characterized in that: The first welding surface is one of the following shapes: ellipse, rounded rectangle, or rounded rhombus.
9. A plate heat exchanger, comprising at least three heat exchange plates, characterized in that: The heat exchange plate is any one of claims 1 to 8 above; Multiple heat exchange plates are stacked in the height direction of the plate heat exchanger. In three adjacent heat exchange plates, the first welding surface of the first heat exchange plate intersects with the first welding surface of the second heat exchange plate to form partial contact. The corner protrusion of the first heat exchange plate is in full contact with the corner protrusion of the second heat exchange plate. The central protrusion of the first heat exchange plate is in full contact with the central protrusion of the second heat exchange plate. The central protrusion of the first heat exchange plate is in full contact with the central protrusion of the second heat exchange plate to form a first fluid channel. The first recess of the second heat exchange plate is in complete contact with the first recess of the third heat exchange plate, and the second recess of the second heat exchange plate is in complete contact with the second recess of the third heat exchange plate to form a second fluid channel. Alternatively, multiple heat exchange plates are stacked in the height direction of the plate heat exchanger. In three adjacent heat exchange plates, the first welding surface of the first heat exchange plate is in full contact with the first welding surface of the second heat exchange plate, and the corner protrusion of the first heat exchange plate is in full contact with the corner protrusion of the second heat exchange plate, the central protrusion of the first heat exchange plate is in full contact with the central protrusion of the second heat exchange plate, and the central protrusion of the first heat exchange plate is in full contact with the central protrusion of the second heat exchange plate, so as to form a first fluid channel. The first recess of the second heat exchange plate is in complete contact with the first recess of the third heat exchange plate, and the second recess of the second heat exchange plate is in complete contact with the second recess of the third heat exchange plate to form a second fluid channel.
10. A heat exchange system, including a plate heat exchanger, characterized in that: The plate heat exchanger is the plate heat exchanger described in claim 9 above.