Heat exchange plates, plate heat exchangers and heat exchange systems

Abstract

The present invention provides a heat exchange plate, a plate heat exchanger, and a heat exchange system. The microstructure of the heat exchange plate includes four first protrusions, four second protrusions, four third protrusions, a fourth protrusion, four first recesses, and eight second recesses. A second protrusion and its two adjacent third protrusions and fourth protrusions form a microunit arranged in a rectangular shape. A first protrusion is located within a microunit, and the welding center of the first welding surface of the first protrusion is offset from the microunit center of the microunit. The heat exchange plate of the present invention can effectively improve the flow disturbance power, so that the flow disturbance of the heat exchange fluid is rapid to enhance the flow disturbance effect, thereby effectively reducing the flow dead zone area. After multiple heat exchange plates are alternately stacked, two adjacent asymmetric fluid channels can be formed, effectively reducing the pressure difference of the heat exchange fluid in the two adjacent asymmetric fluid channels, so as to avoid the heat exchange plate from being compressed, bent, and damaged, further improving the heat exchange performance.

Description

Technical Field

[0001] The present invention 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 Art

[0002] A plate heat exchanger is a highly efficient heat exchanger composed of multiple stacked metal plates with a specific point-wave heat exchange structure. The point-wave heat exchange structure of two adjacent plates forms interlaced fluid channels, allowing the cold and hot fluids to flow through the adjacent channels, exchanging heat. Plate heat exchangers offer high heat exchange efficiency, light weight, minimal footprint, compact structure, and long service life. They are widely used in cooling and heating, waste heat recovery, chemical engineering, aerospace, and automotive batteries, and have a significant market and development prospects.

[0003] See also Figure 1 The existing heat exchange plate is composed of a plurality of micro-units 10 arranged in the length direction Y and the width direction X. The projection of the micro-unit 10 in the height direction of the heat exchange plate is rectangular, and a first convex-concave welding plane 11 is respectively provided at the four corners of each rectangular micro-unit 10, a second convex-concave welding plane 12 is provided between two adjacent first convex-concave welding planes 11 in the length direction Y, a third convex-concave welding plane 13 is provided between two adjacent first convex-concave welding planes 11 in the width direction X, and a fourth convex-concave welding plane 14 is provided in the center of the rectangular micro-unit 10, that is, the welding center of the fourth convex-concave welding plane 14 overlaps with the micro-unit center of the rectangular micro-unit 10.

[0004] However, the microelement center of the existing rectangular microelement unit 10 is overlapped and welded with the welding center of the fourth convex-concave welding plane 14 located inside it, so that multiple existing heat exchange plates are alternately stacked in the height direction to form two adjacent symmetrical fluid channels, and the cold fluid and the hot fluid flow in the two symmetrical fluid channels respectively. In actual use, the flow rate difference between the cold fluid and the hot fluid in the two symmetrical fluid channels is large, resulting in a large pressure difference between the cold fluid and the hot fluid in the two symmetrical fluid channels, so that the heat exchange plate between the two adjacent symmetrical fluid channels needs to withstand a large pressure, so that the heat exchange plate between the two adjacent symmetrical fluid channels is prone to compression, bending and damage, thereby affecting the heat exchange performance.

[0005] Moreover, the microelement center of the existing rectangular microelement unit 10 is overlapped and welded with the welding center of the fourth convex-concave welding plane 14 located inside it, so that the fourth convex-concave welding plane 14 has a uniform and unchanged circumferential flow cross-section. Then, the fourth convex-concave welding plane 14 has a consistent disturbing effect on the heat exchange fluid circulating around it, so that the fourth convex-concave welding plane 14 has a slow disturbing force on the heat exchange fluid in the rectangular microelement unit 10 where it is located, and the disturbing effect is poor, resulting in an increase in the flow dead zone area, thereby affecting the heat exchange capacity. Summary of the Invention

[0006] In order to achieve the first purpose of the present invention, the present invention provides a heat exchange plate that can effectively improve the turbulence power, so that the turbulence of the heat exchange fluid is rapid to enhance the turbulence effect, thereby effectively reducing the flow dead zone area, and thus improving the heat exchange capacity, and multiple heat exchange plates can be stacked alternately to form two adjacent asymmetric fluid channels, effectively reducing the pressure difference of the heat exchange fluid in the two adjacent asymmetric fluid channels, so as to avoid the heat exchange plate from being compressed, bent and damaged, and further improve the heat exchange performance.

[0007] In order to achieve the second object of the present invention, the present invention provides a plate heat exchanger having the above-mentioned heat exchange plates.

[0008] In order to achieve the third object of the present invention, the present invention provides a heat exchange system having the above-mentioned plate heat exchanger.

[0009] In order to achieve the first object of the present invention, the present invention provides a heat exchange plate, which is provided with a plurality of micro-element structures, and the plurality of micro-element structures are arranged side by side in the length direction and the width direction of the heat exchange plate. The projection of each micro-element structure in the height direction of the heat exchange plate is arranged in a rectangular shape, and each micro-element structure includes four first protrusions, four second protrusions, four third protrusions, one fourth protrusion, four first recesses and eight second recesses. The protrusion directions of the first protrusion, the second protrusion, the third protrusion and the fourth protrusion are the same, and the protrusion heights of some / all of the second protrusions, the third protrusions and the fourth protrusions are less than or equal to the protrusion height of the first protrusion, and the first recesses and The second depression has the same depression direction and depression height. The four second protrusions are respectively located at the four corners of the microstructure. A third protrusion is provided in the middle between two adjacent second protrusions. The fourth protrusion is located in the center of the microstructure. A second protrusion and its two adjacent third protrusions and the fourth protrusion form a rectangular microunit. A first protrusion is located in a microunit, and the welding center of the first welding surface of the first protrusion deviates from the microcenter of the microunit. A first depression is located between the fourth protrusion and a third protrusion. A second depression is provided between a second protrusion and its adjacent third protrusion.

[0010] A further solution is that the welding center of the first welding surface has a first offset distance from the micro center of the micro unit in the width direction, and the welding center of the first welding surface has a second offset distance from the micro center of the micro unit in the length direction; or, the welding center of the first welding surface has a third offset distance from the micro center of the micro unit in the width direction, and the welding center of the first welding surface is arranged corresponding to the micro center of the micro unit in the length direction; or, the welding center of the first welding surface is arranged corresponding to the micro center of the micro unit in the width direction, and the welding center of the first welding surface has a fourth offset distance from the micro center of the micro unit in the length direction.

[0011] A further solution is that the first deviation spacing is between 0.1 times and 0.4 times the width of the micro-element unit in the width direction, and / or the second deviation spacing is between 0.1 times and 0.4 times the length of the micro-element unit in the length direction; or, the third deviation spacing is between 0.1 times and 0.4 times the width of the micro-element unit in the width direction; or, the fourth deviation spacing is between 0.1 times and 0.4 times the length of the micro-element unit in the length direction.

[0012] A further solution is that the first recess is arranged away from the third protrusion and close to the fourth protrusion; and / or the second recess is arranged away from the third protrusion and close to the second protrusion.

[0013] A further solution is that the first recess is located in the middle between the fourth protrusion and the third protrusion; and / or the second recess is located in the middle between the third protrusion and the second protrusion.

[0014] A further solution is that the first welding surface has a long side axis and a short side axis that are perpendicular to each other, and there is an inclined angle between the long side axis and the length direction.

[0015] A further solution is that, in the same micro-element structure, two adjacent first welding surfaces in the width direction are symmetrically arranged about the fourth protrusion.

[0016] A further solution is that the area of ​​the first welding surface is greater than any area of ​​the second welding surface of the second protrusion, the third welding surface of the third protrusion, the fourth welding surface of the fourth protrusion, the fifth welding surface of the first depression, and the sixth welding surface of the second depression; and / or, the first welding surface is a shape selected from the group consisting of an ellipse, a rectangle, a diamond, a crescent, a circle, a polygon, and a sector.

[0017] In order to achieve the second purpose of the present invention, the present invention provides a plate heat exchanger, comprising at least three heat exchange plates, the heat exchange plates being the above-mentioned heat exchange plates, and the multiple heat exchange plates are stacked in the height direction of the plate heat exchanger. Among the three adjacent heat exchange plates, the first welding surface of the first heat exchange plate and the first welding surface of the second heat exchange plate partially overlap to form partial contact, and the second protrusion of the first heat exchange plate and the second protrusion of the second heat exchange plate are fully in contact or have a first gap, the third protrusion of the first heat exchange plate and the third protrusion of the second heat exchange plate are fully in contact or have a second gap, and the fourth protrusion of the first heat exchange plate and the fourth protrusion of the second heat exchange plate are fully in contact or have a third gap to form a first fluid channel; the first recess of the second heat exchange plate and the first recess of the third heat exchange plate are fully in contact, and the second recess of the second heat exchange plate and the second recess of the third heat exchange plate are fully in contact to form a second fluid channel.

[0018] In order to achieve the third object of the present invention, the present invention provides a heat exchange system, including a plate heat exchanger, and the plate heat exchanger is the plate heat exchanger mentioned above.

[0019] It can be seen from the above scheme that each rectangular micro-element structure of the heat exchange plate of the present invention is composed of four micro-element units arranged in a rectangular shape, and a rectangular micro-element unit is surrounded by a second protrusion and its two adjacent third protrusions and a fourth protrusion. A first protrusion is located in a rectangular micro-element unit, and the welding center of the first welding surface of the first protrusion deviates from the micro-element center of the rectangular micro-element unit, so that the first welding surface of the first protrusion forms an asymmetric arrangement in the circumferential area of ​​the micro-element unit where it is located, and the micro-element center of the existing micro-element unit overlaps and is welded with the welding center of the fourth convex-concave welding plane located inside it so that the circumferential area of ​​the fourth convex-concave welding plane is The circumferential area is symmetrically arranged, and the welding center of the first welding surface of the first protrusion of the present invention deviates from the microelement center arrangement of the rectangular microelement unit, so that the circumferential area of ​​the first welding surface of the first protrusion is asymmetrically arranged, thereby increasing the change of the flow cross-section, so that the narrower circumferential area of ​​the first welding surface can form rapid turbulence, and the rapid turbulence formed in the narrower area can disturb the wider circumferential area of ​​the first welding surface, forming a tortuous flow disturbance pattern, which can form strong rapid turbulence for low-flow rate heat exchange fluid, effectively enhancing the disturbance power, making the disturbance of the heat exchange fluid rapid to enhance the disturbance effect, thereby effectively reducing the flow dead zone area, and thus improving the heat exchange capacity.

[0020] Moreover, in the plate heat exchanger of the present invention, among the three adjacent heat exchange plates, the first welding surface of the first heat exchange plate and the first welding surface of the second heat exchange plate partially overlap to form partial contact, and the second protrusion of the first heat exchange plate and the second protrusion of the second heat exchange plate are fully in contact or have a first gap, the third protrusion of the first heat exchange plate and the third protrusion of the second heat exchange plate are fully in contact or have a second gap, and the fourth protrusion of the first heat exchange plate and the fourth protrusion of the second heat exchange plate are fully in contact or have a third gap to form a first fluid channel; the first recess of the second heat exchange plate and the first recess of the third heat exchange plate are fully in contact, and the second recess of the second heat exchange plate and the second recess of the third heat exchange plate are fully in contact to form a second fluid channel.

[0021] Thus, the first welding surfaces of two adjacent heat exchange plates of the plate heat exchanger of the present invention partially overlap to form a partial contact weld, so that the first fluid channel and the second fluid channel form an asymmetric fluid channel, that is, after a plurality of heat exchange plates are alternately stacked, two adjacent asymmetric fluid channels can be formed, effectively reducing the pressure difference of the heat exchange fluid in the two adjacent asymmetric fluid channels, so as to avoid the phenomenon of bending and damage of the heat exchange plates, and further improve the heat exchange performance. In addition, the first welding surfaces of two adjacent heat exchange plates of the plate heat exchanger of the present invention partially overlap to form a partial contact weld, which can greatly reduce the flow dead zone area and further improve the effective heat exchange area. Simulation calculations have shown that the heat exchange capacity of the non-complete contact welding form is further improved by about 15% based on the full 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 of the two adjacent heat exchange plates can disturb the heat exchange fluid, thereby further strengthening the turbulence effect, and thus improving the flow distribution uniformity of the heat exchange fluid.

[0022] Therefore, the heat exchange plate of the present invention can effectively improve the turbulence power, so that the turbulence of the heat exchange fluid is rapid to enhance the turbulence effect, thereby effectively reducing the flow dead zone area, and thus improving the heat exchange capacity. After multiple heat exchange plates are alternately stacked, two adjacent asymmetric fluid channels can be formed, effectively reducing the pressure difference of the heat exchange fluid in the two adjacent asymmetric fluid channels, so as to avoid the heat exchange plate from being compressed, bent and damaged, and further improve the heat exchange performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the microelement unit of the existing heat exchange plate.

[0024] Figure 2 It is a structural diagram of the first embodiment of the plate heat exchanger of the present invention.

[0025] Figure 3 It is a partial structural diagram of the first embodiment of the plate heat exchanger of the present invention.

[0026] Figure 4 It is a partial structural exploded view of the first embodiment of the plate heat exchanger of the present invention.

[0027] Figure 5 It is a front view of the partial structure of the first embodiment of the plate heat exchanger of the present invention.

[0028] Figure 6 yes Figure 5 Magnified view at AA.

[0029] Figure 7 yes Figure 5 Magnified view at BB.

[0030] Figure 8 It is a structural cross-sectional view of the microelement unit in the first embodiment of the plate heat exchanger of the present invention.

[0031] Figure 9 It is a structural diagram of a single microelement structure of a heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0032] Figure 10 It is a front view of a single micro-element structure of a heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0033] Figure 11 It is a front view of a single micro-element structure of a heat exchange plate in the second embodiment of the plate heat exchanger of the present invention.

[0034] Figure 12 It is a front view of a single micro-element structure of a heat exchange plate in the third embodiment of the plate heat exchanger of the present invention.

[0035] Figure 13 It is a front view of a single micro-element structure of a heat exchange plate in the fourth embodiment of the plate heat exchanger of the present invention.

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0037] The first embodiment of the plate heat exchanger:

[0038] See also Figures 2 to 10 This embodiment discloses a plate heat exchanger 20, including at least three heat exchange plates 23, four joints 24, an upper end plate 21 and a lower end plate 22. The multiple heat exchange plates 23 are stacked between the upper end plate 21 and the lower end plate 22 in the height direction Z of the plate heat exchanger 20, and the four joints 24 are protrudingly arranged on the upper end plate 21.

[0039] Among them, the heat exchange plate 23 of this embodiment is provided with a plurality of microstructures 230, and the plurality of microstructures 230 are arranged side by side in the length direction Y and the width direction X of the heat exchange plate 23. The projection of each microstructure 230 in the height direction Z of the heat exchange plate 23 is arranged in a rectangular shape, and each microstructure 230 includes four first protrusions 231, four second protrusions 232, four third protrusions 233, one fourth protrusion 234, four first recesses 235 and eight second recesses 236. The protrusion directions of the first protrusion 231, the second protrusion 232, the third protrusion 233 and the fourth protrusion 234 are the same, and the protrusion heights of some / all of the second protrusions 232, the third protrusions 233 and the fourth protrusion 234 are less than or equal to the protrusion height of the first protrusion 231, and the recess directions and recess heights of the first recess 235 and the second recess 236 are the same. Specifically, the protruding direction of the first protrusion 231 and the recessed direction of the first recess 235 are opposite in the height direction Z of the heat exchange plate 23 .

[0040] Furthermore, in this embodiment, the four second protrusions 232 are located at the four corners of the microstructure 230, a third protrusion 233 is provided midway between two adjacent second protrusions 232, and a fourth protrusion 234 is located at the center of the microstructure 230. A second protrusion 232, its two adjacent third protrusions 233, and its fourth protrusion 234 form a rectangular microstructure. A first protrusion 231 is located within the microstructure, and the welding center 2314 of the first welding surface 2311 of the first protrusion 231 is staggered away from the microstructure center 237 of the microstructure. A first recess 235 is located between the fourth protrusion 234 and a third protrusion 233, and a second recess 236 is provided between a second protrusion 232 and an adjacent third protrusion 233. Specifically, the first welding surface 2311 of the first protrusion 231 is the welding surface of the first protrusion 231 that is away from the first recess 235.

[0041] It can be seen that each rectangular micro-element structure 230 of the heat exchange plate 23 of this embodiment is composed of four micro-element units arranged in a rectangular shape, and a rectangular micro-element unit is surrounded by a second protrusion 232 and its two adjacent third protrusions 233 and a fourth protrusion 234. A first protrusion 231 is located in a rectangular micro-element unit, and the welding center 2314 of the first welding surface 2311 of the first protrusion 231 deviates from the micro-element center 237 of the rectangular micro-element unit and is staggered, so that the first welding surface 2311 of the first protrusion 231 forms an asymmetric arrangement in the circumferential area of ​​the micro-element unit where it is located, relative to the micro-element center of the existing micro-element unit 10 and the welding center of the fourth convex-concave welding plane 14 located therein overlap and weld so that the fourth convex-concave welding plane The circumferential area of ​​surface 14 is symmetrically arranged. The welding center 2314 of the first welding surface 2311 of the first protrusion 231 in this embodiment is staggered away from the microelement center 237 of the rectangular microelement unit, so that the circumferential area of ​​the first welding surface 2311 of the first protrusion 231 is asymmetrically arranged, thereby increasing the change in the flow cross-section, so that the narrower circumferential area of ​​the first welding surface 2311 can form rapid turbulence, and the rapid turbulence formed in the narrower area can disturb the wider circumferential area of ​​the first welding surface 2311, forming a tortuous flow disturbance pattern, which can form strong rapid turbulence for low-flow heat exchange fluid, effectively enhance the disturbance power, make the disturbance of the heat exchange fluid rapid to enhance the disturbance effect, thereby effectively reducing the flow dead zone area, and thus improving the heat exchange capacity.

[0042] In addition, in the plate heat exchanger 20 of the present embodiment, among the three adjacent heat exchange plates 23, the first welding surface 2311 of the first heat exchange plate 23 partially overlaps with the first welding surface 2311 of the second heat exchange plate 23 to form partial contact, and the second protrusion 232 of the first heat exchange plate 23 and the second protrusion 232 of the second heat exchange plate 23 are in full contact or have a first gap, and the third protrusion 233 of the first heat exchange plate 23 and the third protrusion 233 of the second heat exchange plate 23 are in full contact. The fourth protrusion 234 of the first heat exchange plate 23 and the fourth protrusion 234 of the second heat exchange plate 23 are in full contact with each other or have a third gap H therebetween to form a first fluid channel 25; the first recess 235 of the second heat exchange plate 23 and the first recess 235 of the third heat exchange plate 23 are in full contact with each other, and the second recess 236 of the second heat exchange plate 23 and the second recess 236 of the third heat exchange plate 23 are in full contact with each other to form a second fluid channel 26.

[0043] Thus, the first welding surfaces 2311 of two adjacent heat exchange plates 23 of the plate heat exchanger 20 of this embodiment are partially overlapped to form a local contact weld, so that the first fluid channel 25 and the second fluid channel 26 form an asymmetric fluid channel, that is, a plurality of heat exchange plates 23 can be alternately stacked to form two adjacent asymmetric fluid channels, effectively reducing the pressure difference of the heat exchange fluid in the two adjacent asymmetric fluid channels, so as to avoid the heat exchange plate 23 from being compressed, bent and damaged, and further improve the heat exchange performance. In addition, the first welding surfaces 2311 of two adjacent heat exchange plates 23 of the plate heat exchanger 20 of this embodiment partially overlap to form local contact welding, which can greatly reduce the flow dead zone area and further increase the effective heat exchange area. Simulation calculations have proved that the heat exchange capacity of the non-complete contact welding form is further improved by about 15% based on the full contact welding form. At the same time, the non-complete contact welding form can make the pressure loss smaller, and the non-contact area between the first welding surfaces 2311 of the two adjacent heat exchange plates 23 can disturb the heat exchange fluid, thereby further enhancing the turbulence effect and improving the flow distribution uniformity of the heat exchange fluid.

[0044] Therefore, the heat exchange plate 23 of this embodiment can effectively improve the turbulence power, so that the turbulence of the heat exchange fluid is rapid to enhance the turbulence effect, thereby effectively reducing the flow dead zone area, and thus improving the heat exchange capacity, and multiple heat exchange plates 23 can be stacked alternately to form two adjacent asymmetric fluid channels, effectively reducing the pressure difference of the heat exchange fluid in the two adjacent asymmetric fluid channels, so as to avoid the heat exchange plate 23 from being compressed, bent and damaged, and further improve the heat exchange performance.

[0045] Specifically, in this embodiment, the protrusion heights of all the second protrusions 232 and the third protrusions 233 are equal to the protrusion height of the first protrusion 231, and the protrusion heights of all the fourth protrusions 234 are less than the protrusion height of the first protrusion 231, so that in the three adjacent heat exchange plates 23, the first welding surface 2311 of the first heat exchange plate 23 and the first welding surface 2311 of the second heat exchange plate 23 partially overlap to form a partial contact, and the second protrusions 232 of the first heat exchange plate 23 are fully in contact with the second protrusions 232 of the second heat exchange plate 23, and the first and second protrusions 232 of the first heat exchange plate 23 are in contact with each other. The third protrusion 233 of one heat exchange plate 23 is fully in contact with the third protrusion 233 of the second heat exchange plate 23, and a third gap H is provided between the fourth protrusion 234 of the first heat exchange plate 23 and the fourth protrusion 234 of the second heat exchange plate 23, thereby forming a first fluid channel 25. The first recess 235 of the second heat exchange plate 23 is fully in contact with the first recess 235 of the third heat exchange plate 23, and the second recess 236 of the second heat exchange plate 23 is fully in contact with the second recess 236 of the third heat exchange plate 23, thereby forming a second fluid channel 26. Thus, in this embodiment, a third gap H is provided between the fourth protrusions 234 of two adjacent heat exchange plates 23. The presence of the third gap H can reduce flow resistance and further enhance the flow turbulence effect.

[0046] Furthermore, in this embodiment, copper foil solder is placed at the local contact between the first welding surface 2311 of the first heat exchange plate 23 and the first welding surface 2311 of the second heat exchange plate 23, and copper foil solder is placed at all contacts between the second protrusion 232 of the first heat exchange plate 23 and the second protrusion 232 of the second heat exchange plate 23, and copper foil solder is placed at all contacts between the third protrusion 233 of the first heat exchange plate 23 and the third protrusion 233 of the second heat exchange plate 23, and copper foil solder is placed at all contacts between the fourth protrusion 234 of the first heat exchange plate 23 and the A third gap H is defined between the fourth protrusions 234 of the second heat exchange plate 23. Copper foil solder is placed at all contact points between the first recess 235 of the second heat exchange plate 23 and the first recess 235 of the third heat exchange plate 23. Copper foil solder is also placed at all contact points between the second recess 236 of the second heat exchange plate 23 and the second recess 236 of the third heat exchange plate 23. The copper foil solder is melted at high temperature by vacuum brazing to form an integrated plate heat exchanger 20, thereby forming the first fluid channel 25 and the second fluid channel 26. The first fluid channel 25 is used to flow with the heat exchange fluid, such as a refrigerant, and the second fluid channel 26 is used to flow with the heat exchange fluid, such as water.

[0047] The first welding surface 2311 of the first protrusion 231 may be in a shape selected from the group consisting of an ellipse, a rectangle, a diamond, a crescent, a circle, a polygon, and a sector.

[0048] Combine Figure 9 and Figure 10In this embodiment, the first welding surface 2311 of the first protrusion 231 has a long axis 2312 and a short axis 2313 that are perpendicular to each other. The long axis 2312 forms an angle θ with the longitudinal direction Y. Thus, the first welding surfaces 2311 of two adjacent heat exchange plates 23 in this embodiment intersect and overlap to form a localized contact weld. The long axis 2312 of the first welding surface 2311, which is inclined relative to the longitudinal direction Y, further disturbs the heat exchange fluid, thereby further enhancing the flow disturbance effect and improving the uniformity of the heat exchange fluid flow distribution. Specifically, the first welding surface 2311 of the first protrusion 231 in this embodiment is shaped like an ellipse, a rectangle, or a diamond, so that the first welding surface 2311 of the first protrusion 231 has a long axis 2312 and a short axis 2313 that are perpendicular to each other.

[0049] Furthermore, in this embodiment, a third offset distance h1 is defined between the welding center 2314 of the first welding surface 2311 of the first protrusion 231 and the micro-unit center 237 of the micro-unit in the width direction X, and the welding center 2314 of the first welding surface 2311 is disposed correspondingly to the micro-unit center 237 of the micro-unit in the length direction Y. Preferably, in this embodiment, the third offset distance h1 is between 0.1 and 0.4 times the width a of the micro-unit in the width direction X.

[0050] In order to reduce the transition curvature between adjacent convex-concave structures, the first concave 235 of this embodiment is arranged away from the third protrusion 233 and close to the fourth protrusion 234, and the second concave 236 of this embodiment is arranged away from the third protrusion 233 and close to the second protrusion 232, so that the first concave 235 and the second concave 236 located on the periphery of a rectangular micro-unit are respectively away from the long side axis 2312 of the first welding surface 2311 of the first protrusion 231, that is, the first concave 235 and the second concave 236 are respectively away from the long side axis 2312 of the first welding surface 2311 of the first protrusion 231. The distance between the long side axes 2312 of the first welding surface 2311 is increased, which can effectively slow down the transition curvature between adjacent convex and concave structures, thereby reducing the difficulty of processing and forming production, improving processing and forming production efficiency, and thus improving the processing and forming effect and yield rate. In addition, the first recess 235 and the second recess 236 located on the periphery of a rectangular micro-unit are respectively away from the long side axis 2312 of the first welding surface 2311 of the first protrusion 231, which can effectively disturb the heat exchange fluid, thereby improving the turbulence capacity and improving the heat exchange performance.

[0051] In order to further reduce the transition curvature between adjacent convex-concave structures and thus lower the difficulty of manufacturing and forming, in this embodiment, the first spacing A between the first concave 235 and the fourth protrusion 234 is equal to the second spacing B between the second concave 236 and the second protrusion 232. Preferably, the first spacing A is between 0.1 and 0.4 times the length b of the micro-unit in the length direction Y, or the first spacing A is between 0.1 and 0.4 times the width a of the micro-unit in the width direction X.

[0052] To further enhance the flow turbulence capability and thus the heat exchange performance, the area of ​​the first welding surface 2311 of the first protrusion 231 in this embodiment is greater than any of the areas of the second welding surface of the second protrusion 232, the third welding surface of the third protrusion 233, the fourth welding surface of the fourth protrusion 234, the fifth welding surface 2351 of the first recess 235, and the sixth welding surface 2361 of the second recess 236. Specifically, in this embodiment, the second welding surface of the second protrusion 232 away from the first recess 235, the third welding surface of the third protrusion 233 away from the first recess 235, the fourth welding surface of the fourth protrusion 234 away from the first recess 235, the fifth welding surface 2351 of the first recess 235 away from the first protrusion 231, and the sixth welding surface 2361 of the second recess 236 away from the first protrusion 231 can be one of an ellipse, a rounded rectangle, a rounded diamond, a circle, a rounded square, a rounded triangle, a crescent, a fan, or the like. Furthermore, in this embodiment, the shapes of the multiple sixth welding surfaces 2361 are one shape or multiple shapes.

[0053] In order to improve the flow smoothness and distribution uniformity of the heat exchange fluid, in this embodiment, in a microstructure 230, adjacent convex and concave features in four first protrusions 231, four second protrusions 232, four third protrusions 233, one fourth protrusion 234, four first recesses 235 and eight second recesses 236 are smoothly connected by smooth curved surfaces.

[0054] The second embodiment of the plate heat exchanger:

[0055] As an explanation of the second embodiment of the plate heat exchanger of the present invention, only the differences from the first embodiment of the plate heat exchanger are described below.

[0056] See also Figure 11 In the same microstructure 230, the two adjacent first welding surfaces 2311 in the width direction X are symmetrically arranged about the fourth protrusion 234, so that the inclination directions of the first welding surfaces 2311 of the two adjacent first protrusions 231 in the width direction X are opposite / departed from each other, which can multiply the flow disturbance capability, thereby improving the distribution uniformity of the heat exchange fluid, and further multiplying the heat exchange performance.

[0057] In order to further enhance the spoiler effect, the welding center 2314 of the first welding surface 2311 of the first protrusion 231 of this embodiment has a first deviation distance h2 from the micro-element center 237 of the micro-element unit in the width direction X, and the welding center 2314 of the first welding surface 2311 has a second deviation distance h3 from the micro-element center 237 of the micro-element unit in the length direction Y.

[0058] Preferably, the first offset distance h2 of this embodiment is between 0.1 and 0.4 times the width a of the micro unit in the width direction X, and the second offset distance h3 of this embodiment is between 0.1 and 0.4 times the length b of the micro unit in the length direction Y.

[0059] The third embodiment of the plate heat exchanger:

[0060] As an explanation of the third embodiment of the plate heat exchanger of the present invention, only the differences from the first embodiment of the plate heat exchanger are described below.

[0061] See also Figure 12 In this embodiment, the first recess 235 is located in the middle between the fourth protrusion 234 and the third protrusion 233, and the second recess 236 is located in the middle between the third protrusion 233 and the second protrusion 232, thereby enhancing the structural strength and stability of the heat exchange plate 23.

[0062] In order to further enhance the spoiler effect, the welding center 2314 of the first welding surface 2311 of the first protrusion 231 of this embodiment has a first deviation distance h2 from the micro-element center 237 of the micro-element unit in the width direction X, and the welding center 2314 of the first welding surface 2311 has a second deviation distance h3 from the micro-element center 237 of the micro-element unit in the length direction Y.

[0063] Preferably, the first offset distance h2 of this embodiment is between 0.1 and 0.4 times the width a of the micro unit in the width direction X, and the second offset distance h3 of this embodiment is between 0.1 and 0.4 times the length b of the micro unit in the length direction Y.

[0064] The fourth embodiment of the plate heat exchanger:

[0065] As an explanation of the fourth embodiment of the plate heat exchanger of the present invention, only the differences from the third embodiment of the plate heat exchanger are described below.

[0066] See also Figure 13In this embodiment, the welding center 2314' of the first welding surface 2311' of the first protrusion 231 is arranged to correspond to the micro-center 237 of the micro-unit in the width direction X. A fourth offset distance h4 is provided between the welding center 2314' of the first welding surface 2311' and the micro-center 237 of the micro-unit in the length direction Y, further enhancing the airflow turbulence effect. Preferably, in this embodiment, the fourth offset distance h4 is between 0.1 and 0.4 times the length b of the micro-unit in the length direction Y.

[0067] Specifically, the first welding surface 2311 ′ of the first protrusion 231 of this embodiment is crescent-shaped.

[0068] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles of the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A heat exchange plate having a plurality of microstructures arranged side by side in the length and width directions of the heat exchange plate, wherein the projection of each microstructure in the height direction of the heat exchange plate is rectangular, characterized in that: Each of the micro-unit structures includes four first protrusions, four second protrusions, four third protrusions, one fourth protrusion, four first recesses, and eight second recesses. The first protrusions, the second protrusions, the third protrusions, and the fourth protrusions have the same protrusion direction, and the protrusion heights of some / all of the second protrusions, the third protrusions, and the fourth protrusions are less than or equal to the protrusion height of the first protrusion. The first recesses and the second recesses have the same recess direction and recess height. The four second protrusions are respectively located at the four corners of the microstructure, a third protrusion is provided in the middle between two adjacent second protrusions, the fourth protrusion is located in the center of the microstructure, a second protrusion and its two adjacent third protrusions and the fourth protrusion form a rectangular microunit, a first protrusion is located in a microunit, and the welding center of the first welding surface of the first protrusion is deviated from the microcenter of the microunit, a first depression is located between the fourth protrusion and a third protrusion, and a second depression is provided between a second protrusion and an adjacent third protrusion.

2. The heat exchange plate according to claim 1, characterized in that: A first offset distance exists between the welding center of the first welding surface and the micro-element center of the micro-element unit in the width direction, and a second offset distance exists between the welding center of the first welding surface and the micro-element center of the micro-element unit in the length direction; Alternatively, a third offset distance exists between the welding center of the first welding surface and the micro-element center of the micro-element unit in the width direction, and the welding center of the first welding surface is arranged corresponding to the micro-element center of the micro-element unit in the length direction; Alternatively, the welding center of the first welding surface is arranged corresponding to the micro-element center of the micro-element unit in the width direction, and there is a fourth offset distance between the welding center of the first welding surface and the micro-element center of the micro-element unit in the length direction.

3. The heat exchange plate according to claim 2, characterized in that: The first offset spacing is between 0.1 times and 0.4 times the width of the micro unit in the width direction, and / or the second offset spacing is between 0.1 times and 0.4 times the length of the micro unit in the length direction; Alternatively, the third offset spacing is between 0.1 times and 0.4 times the width of the micro unit in the width direction; Alternatively, the fourth offset distance is between 0.1 times and 0.4 times the length of the micro unit in the length direction.

4. The heat exchange plate according to claim 1, characterized in that: The first recess is arranged away from the third protrusion and close to the fourth protrusion; And / or, the second recess is arranged close to the second protrusion and away from the third protrusion.

5. The heat exchange plate according to claim 1, characterized in that: The first recess is located in the middle between the fourth protrusion and the third protrusion; And / or, the second recess is located in the middle between the third protrusion and the second protrusion.

6. The heat exchange plate according to claim 1, characterized in that: The first welding surface has a long side axis and a short side axis that are perpendicular to each other, and an inclined angle is formed between the long side axis and the length direction.

7. The heat exchange plate according to claim 6, characterized in that: In the same micro-element structure, two adjacent first welding surfaces in the width direction are symmetrically arranged with respect to the fourth protrusion.

8. The heat exchange plate according to claim 1, characterized in that: The area of ​​the first welding surface is larger than any of the areas of the second welding surface of the second protrusion, the third welding surface of the third protrusion, the fourth welding surface of the fourth protrusion, the fifth welding surface of the first recess, and the sixth welding surface of the second recess; And / or, the first welding surface is in a shape of an ellipse, a rectangle, a diamond, a crescent, a circle, a polygon, or a sector.

9. A plate heat exchanger comprising at least three heat exchange plates, characterized in that: The heat exchange plate is the heat exchange plate according to any one of claims 1 to 8; The plurality of heat exchange plates are stacked in the height direction of the plate heat exchanger, and among three adjacent heat exchange plates, the first welding surface of the first heat exchange plate partially overlaps with the first welding surface of the second heat exchange plate to form partial contact, and the second protrusion of the first heat exchange plate and the second protrusion of the second heat exchange plate are fully in contact with or have a first gap, the third protrusion of the first heat exchange plate and the third protrusion of the second heat exchange plate are fully in contact with or have a second gap, and the fourth protrusion of the first heat exchange plate and the fourth protrusion of the second heat exchange plate are fully in contact with or have a third gap, so as 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, so as 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 according to claim 9.

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