Heat exchange plate, plate heat exchanger and heat exchange system
By designing polygonal heat exchange units and increasing the number of welding positions, the problem of insufficient welding position density of existing heat exchange plates was solved, the strength and pressure resistance of the welded structure were improved, the turbulence effect was enhanced, and the heat exchange efficiency was increased.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GREE ELECTRIC APPLIANCE INC OF ZHUHAI
- Filing Date
- 2025-07-21
- Publication Date
- 2026-07-07
AI Technical Summary
The existing heat exchange plates have a low weld density, resulting in poor weld structure strength, which affects pressure resistance and heat exchange efficiency.
The design incorporates polygonal heat exchange units to increase the number of weld positions. A first convex and concave portion are set at the center of the polygonal heat exchange unit, and welding is performed between adjacent heat exchange plates in a specific direction and height to form multiple weld surfaces, thereby increasing the weld position density.
The welded structure between adjacent heat exchange plates is strengthened, pressure resistance is enhanced, and heat exchange capacity is improved through turbulence.
Smart Images
Figure CN224470903U_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, power, shipbuilding, and automotive batteries, demonstrating a large market and promising development prospects.
[0003] See Figure 1 The existing plate heat exchanger has multiple heat exchange units 10 arranged on the heat exchange plates in the width and length directions of the heat exchange plates. Each heat exchange unit 10 has a quadrilateral projection in the height direction of the heat exchange plate. A first protrusion 12 is provided at each of the four corners of the quadrilateral heat exchange unit 10, a recess 13 is provided in the middle of each of the four sides of the quadrilateral heat exchange unit 10, and a second protrusion 11 is provided in the middle of the quadrilateral heat exchange unit 10. This allows for the arrangement of heat exchange units on three adjacent heat exchange plates. In the first heat exchange plate, the first protrusion 12 is welded to the first protrusion 12 of the second heat exchange plate, and the second protrusion 11 of the first heat exchange plate is welded to the second protrusion 11 of the second heat exchange plate to form a first fluid channel, thereby making each heat exchange unit 10 have five welding positions in the first fluid channel. In addition, the concave portion 13 of the second heat exchange plate is welded to the concave portion 13 of the third heat exchange plate to form a second fluid channel, thereby making each heat exchange unit 10 have four welding positions in the second fluid channel.
[0004] However, the existing heat exchange plates can only form four or five welding positions in a single quadrilateral heat exchange unit 10. The number of welding positions is small, that is, the density of welding positions in a single quadrilateral heat exchange unit 10 is small, which affects the strength of the welding structure between two adjacent heat exchange plates, resulting in poor pressure resistance and thus affecting the heat exchange capacity. Summary of the Invention
[0005] To achieve the first objective of this utility model, this utility model provides a heat exchange plate that can double the number of welded positions in a single heat exchange unit, thereby doubling the density of welded positions in a single heat exchange unit, thereby improving the welded structure strength between two adjacent heat exchange plates, enhancing pressure resistance, and enhancing the turbulence effect, thus improving heat exchange capacity.
[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 first objective of this utility model, a heat exchange plate is provided, which is provided with multiple heat exchange units. The multiple heat exchange units are arranged in the width and length directions of the heat exchange plate. The projection of each heat exchange unit in the height direction of the heat exchange plate is polygonal, and the polygon has at least four sides. A first protrusion is provided at the center of each heat exchange unit, a first concave part is provided at each corner of each heat exchange unit, and a second concave part is provided at the middle of each side of each heat exchange unit. A second protrusion is provided at the middle between a first concave part and an adjacent second concave part. The protrusion direction and protrusion height of the first protrusion and the second protrusion are the same. The concavity direction and concavity height of the first concave part are the same. Moreover, the protrusion direction of the first protrusion and the concavity direction of the first concave part are opposite in the height direction.
[0009] A further embodiment is that the first welding surface of the first protrusion has a first long side axis and a first short side axis arranged perpendicularly to each other; the first long side axis has a first included angle with the length direction, or the first long side axis extends in the length direction, or the first long side axis extends in the width direction.
[0010] A further option is to arrange two adjacent first welding surfaces in parallel in the width direction; or, to arrange two adjacent first welding surfaces in the width direction symmetrically about the second recess.
[0011] A further embodiment is that, in the width direction, the area of the first welding surface of the plurality of first protrusions gradually decreases from one side of the heat exchange plate toward the other side of the heat exchange plate.
[0012] A further embodiment is that the second protrusions of two adjacent heat exchange units are connected so that the welding surfaces of the two second protrusions are connected to form a second welding surface. The second welding surface has a second long side axis and a second short side axis that are perpendicular to each other. The second long side axis has a second included angle with the length direction, or the second long side axis extends in the length direction, or the second long side axis extends in the width direction.
[0013] A further embodiment is that the second recesses of two adjacent heat exchange units are connected so that the welding surfaces of the two second recesses are connected to form a third welding surface. The third welding surface has a third long side axis and a third short side axis that are perpendicular to each other. The third long side axis has a third included angle with the length direction, or the third long side axis extends in the length direction, or the third long side axis extends in the width direction.
[0014] A further proposed solution is to use a quadrilateral polygon, with each heat exchange unit having one first convex part, eight second convex parts, four first concave parts, and four second concave parts.
[0015] A further solution is to connect the first recesses of four adjacent heat exchange units so that the welding surfaces of the four first recesses are connected to form a fourth welding surface. The fourth welding surface is square, and two of the corners of the fourth welding surface are arranged side by side in the width direction, and the other two corners of the fourth welding surface are arranged side by side in the length direction.
[0016] To achieve the second objective of this utility model, this utility model provides a plate heat exchanger, including at least three heat exchange plates, which are the heat exchange plates described above. Multiple heat exchange plates are stacked in the height direction of the plate heat exchanger. In three adjacent heat exchange plates, a first protrusion of the first heat exchange plate is welded to a first protrusion of the second heat exchange plate, and a second protrusion of the first heat exchange plate is welded to a second protrusion of the second heat exchange plate to form a first fluid channel. A first concave portion of the second heat exchange plate is welded to a first concave portion of the third heat exchange plate, and a second concave portion of the second heat exchange plate is welded to a second concave portion of the third heat exchange plate to form a second fluid channel.
[0017] 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.
[0018] As can be seen from the above scheme, in the plate heat exchanger of this utility model, the first convex portion of the first heat exchange plate is welded to the first convex portion of the second heat exchange plate, and the second convex portion of the first heat exchange plate is welded to the second convex portion of the second heat exchange plate to form a first fluid channel, so that a single heat exchange unit can form at least nine welding positions in the first fluid channel; the first concave portion of the second heat exchange plate is welded to the first concave portion of the third heat exchange plate, and the second concave portion of the second heat exchange plate is welded to the second concave portion of the third heat exchange plate to form a second fluid channel, so that a single heat exchange unit can form at least eight welding positions in the second fluid channel.
[0019] Compared to existing heat exchange plates where a single heat exchange unit can only form four or five welding positions, the heat exchange plate of this invention can form at least eight welding positions and at least nine welding positions at both ends in the height direction, thereby doubling the number of welding positions in a single heat exchange unit and doubling the density of welding positions in a single heat exchange unit. This improves the weld structure strength between two adjacent heat exchange plates, enhances pressure resistance, and enhances the turbulence effect, thereby improving the heat exchange capacity. Attached Figure Description
[0020] Figure 1 This is a structural diagram of a single heat exchange unit in an existing plate heat exchanger.
[0021] Figure 2 This is a partial structural diagram of the first embodiment of the plate heat exchanger of this utility model.
[0022] Figure 3 This is a partial exploded view of the first embodiment of the plate heat exchanger of this utility model.
[0023] Figure 4 This is a partial structural front view of the first embodiment of the plate heat exchanger of this utility model.
[0024] Figure 5 yes Figure 4 Sectional view at AA.
[0025] Figure 6 This is a structural diagram of a single heat exchange unit in the first embodiment of the plate heat exchanger of this utility model.
[0026] Figure 7 This is an exploded view of a single heat exchange unit in the first embodiment of the plate heat exchanger of this utility model.
[0027] Figure 8 This is a front view of a single heat exchange unit in the first embodiment of the plate heat exchanger of this utility model.
[0028] Figure 9 yes Figure 8 Sectional view at BB.
[0029] Figure 10 yes Figure 8 Sectional view at CC.
[0030] Figure 11 yes Figure 8 Sectional view at DD.
[0031] Figure 12 This is a schematic diagram of the partial welding of the first welding surfaces of two adjacent heat exchange plates in the first embodiment of the plate heat exchanger of this utility model.
[0032] Figure 13 This is a partial structural front view of the heat exchange plates in the second embodiment of the plate heat exchanger of this utility model.
[0033] Figure 14 This is a partial structural front view of the heat exchange plates in the third embodiment of the plate heat exchanger of this utility model.
[0034] Figure 15 This is a partial structural front view of the heat exchange plates in the fourth embodiment of the plate heat exchanger of this utility model.
[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation
[0036] First embodiment of plate heat exchanger:
[0037] See Figures 2 to 12 This embodiment discloses a plate heat exchanger, including at least three heat exchange plates 20, which are stacked in the height direction Z of the plate heat exchanger.
[0038] In this embodiment, the heat exchange plate 20 is provided with a plurality of heat exchange units 28, which are arranged in the width direction X and the length direction Y of the heat exchange plate 20. The projection of each heat exchange unit 28 in the height direction Z of the heat exchange plate 20 is polygonal, and the polygon has at least four sides.
[0039] Furthermore, in this embodiment, each heat exchange unit 28 has a first protrusion 21 at its center, a first recess 23 at each corner of each heat exchange unit 28, a second recess 24 at the middle of each side of each heat exchange unit 28, and a second protrusion 22 at the middle between a first recess 23 and an adjacent second recess 24.
[0040] Furthermore, in this embodiment, the first protrusion 21 and the second protrusion 22 have the same protrusion direction and protrusion height, the first concave portion 23 and the second concave portion 24 have the same concave direction and concave height, and the protrusion direction of the first protrusion 21 and the concave direction of the first concave portion 23 are set opposite to each other in the height direction Z.
[0041] In this embodiment of the plate heat exchanger, among three adjacent heat exchange plates 20, the first protrusion 21 of the first heat exchange plate 20 is welded to the first protrusion 21 of the second heat exchange plate 20, and the second protrusion 22 of the first heat exchange plate 20 is welded to the second protrusion 22 of the second heat exchange plate 20 to form a first fluid channel 25, so that a single heat exchange unit 28 can form at least nine welding positions in the first fluid channel 25; the first concave portion 23 of the second heat exchange plate 20 is welded to the first concave portion 23 of the third heat exchange plate 20, and the second concave portion 24 of the second heat exchange plate 20 is welded to the second concave portion 24 of the third heat exchange plate 20 to form a second fluid channel 26, so that a single heat exchange unit 28 can form at least eight welding positions in the second fluid channel 26.
[0042] Compared to existing heat exchange plates where a single heat exchange unit can only form four or five welding positions, in this embodiment, a single heat exchange unit 28 of the heat exchange plate 20 can form at least eight welding positions and at least nine welding positions at its two ends in the height direction Z, thereby doubling the number of welding positions in a single heat exchange unit 28 and doubling the density of welding positions in a single heat exchange unit 28. This improves the weld structure strength between two adjacent heat exchange plates 20, enhances pressure resistance, and enhances the turbulence effect, thereby improving the heat exchange capacity.
[0043] Specifically, in this embodiment, the projection of each heat exchange unit 28 onto the height direction Z of the heat exchange plate 20 is quadrilateral, thus each heat exchange unit 28 is provided with one first protrusion 21, eight second protrusions 22, four first recesses 23, and four second recesses 24. Alternatively, when the projection of each heat exchange unit 28 onto the height direction Z of the heat exchange plate 20 is pentagonal, each heat exchange unit 28 is provided with one first protrusion 21, ten second protrusions 22, five first recesses 23, and five second recesses 24; when the projection of each heat exchange unit 28 onto the height direction Z of the heat exchange plate 20 is hexagonal, each heat exchange unit 28 is provided with one first protrusion 21, twelve second protrusions 22, six first recesses 23, and six second recesses 24; and so on.
[0044] Furthermore, in this embodiment, copper foil solder is placed at the contact points between the first protrusion 21 of the first heat exchange plate 20 and the first protrusion 21 of the second heat exchange plate 20, copper foil solder is placed at the contact points between the second protrusion 22 of the first heat exchange plate 20 and the second protrusion 22 of the second heat exchange plate 20, copper foil solder is placed at the contact points between the first recess 23 of the second heat exchange plate 20 and the first recess 23 of the third heat exchange plate 20, and copper foil solder is placed at the contact points between the second recess 24 of the second heat exchange plate 20 and the second recess 24 of the third heat exchange plate 20. Thus, the copper foil solder is melted at high temperature through vacuum brazing to form an integrated plate heat exchanger, thereby forming a first fluid channel 25 and a second fluid channel 26. The heat exchange medium, such as refrigerant, flows through the first fluid channel 25, and the heat exchange medium, such as water, flows through the second fluid channel 26.
[0045] The first welding surface 211 of the first protrusion 21 has a first long side axis 212 and a first short side axis 213 arranged perpendicularly to each other. The first long side axis 212 has a first included angle θ with the length direction Y, or the first long side axis 212 extends in the length direction Y, or the first long side axis 212 extends in the width direction X.
[0046] Preferably, in this embodiment, the first long side axis 212 of the first welding surface 211 of the first protrusion 21 has a first included angle θ with the length direction Y, thereby making the first long side axis 212 of the first welding surface 211 inclined relative to the width direction X and the length direction Y. Specifically, in this embodiment, the first welding surface 211 is one of the shapes of an ellipse, a rounded rectangle, or a rounded rhombus.
[0047] In one welding method, in a plate heat exchanger, among three adjacent heat exchange plates 20, the first welding surface 211 of the first heat exchange plate 20 is fully welded to the first welding surface 211 of the second heat exchange plate 20, and the second protrusion 22 of the first heat exchange plate 20 is welded to the second protrusion 22 of the second heat exchange plate 20 to form a first fluid channel 25; the first concave portion 23 of the second heat exchange plate 20 is welded to the first concave portion 23 of the third heat exchange plate 20, and the second concave portion 24 of the second heat exchange plate 20 is welded to the second concave portion 24 of the third heat exchange plate 20 to form a second fluid channel 26.
[0048] Another welding method, such as Figure 12As shown, in this embodiment of the plate heat exchanger, among its three adjacent heat exchange plates 20, the first welding surface 211 of the first heat exchange plate 20 and the first welding surface 211 of the second heat exchange plate 20 are partially welded together, and the second protrusion 22 of the first heat exchange plate 20 is welded together with the second protrusion 22 of the second heat exchange plate 20 to form a first fluid channel 25; the first concave portion 23 of the second heat exchange plate 20 is welded together with the first concave portion 23 of the third heat exchange plate 20, and the second concave portion 24 of the second heat exchange plate 20 is welded together with the second concave portion 24 of the third heat exchange plate 20 to form a second fluid channel 26. Therefore, in this embodiment, the first welding surfaces 211 of two adjacent heat exchange plates 20 of the plate heat exchanger intersect and partially weld to form a partial contact welding area 214. This intersecting partial contact welding, based on the aforementioned full contact welding, can further reduce the flow resistance in the fluid channel by more than 15%, thereby further increasing the flow rate of the fluid medium in the fluid channel, making the flow rate of the fluid medium in the fluid channel even greater. Moreover, the non-overlapping area 215 formed by the first welding surfaces 211 of the two adjacent heat exchange plates 20 outside the intersecting partial contact welding can facilitate convection. Multi-directional disturbance of the fluid medium within the fluid channel can generate strong turbulence in low-speed fluid media, causing the fluid medium within the fluid channel to form a "cross-flow" or "zigzag flow" pattern, significantly enhancing the turbulence effect and effectively reducing the dead zone area. Furthermore, under the turbulence and flow splitting effect of the first long side axis 212 and the first short side axis 213 of the first welding surface 211 in the non-overlapping region 215 inclined relative to the length direction Y and width direction X, it is more conducive to the uniform distribution of the fluid medium flow rate, thereby improving heat exchange efficiency and heat exchange effect, and thus enhancing the heat exchange capacity.
[0049] To further improve the turbulence effect, in this embodiment, in a heat exchange unit 28, the areas of the second welding surface 221 of the second protrusion 22, the third welding surface 241 of the second concave portion 24, and the fourth welding surface 231 of the first concave portion 23 are all smaller than the area of the first welding surface 211 of the first protrusion 21. That is, in this embodiment, the area of the first welding surface 211 of the first protrusion 21 is larger than the area of any one of the welding surfaces of the second welding surface 221 of the second protrusion 22, the third welding surface 241 of the second concave portion 24, and the fourth welding surface 231 of the first concave portion 23. Specifically, in this embodiment, the second welding surface 221 of the second protrusion 22, which is far away from the first concave portion 23 in the height direction Z, is half of a shape such as a circle, ellipse, rhombus, polygon, or parallelogram. In this embodiment, the third welding surface 241 of the second concave portion 24, which is far away from the first protrusion 21 in the height direction Z, is half of a shape such as a circle, ellipse, rhombus, polygon, or parallelogram. In this embodiment, the fourth welding surface 231 of the first concave portion 23, which is far away from the first protrusion 21 in the height direction Z, is a quarter of a shape such as a circle, ellipse, rhombus, polygon, or parallelogram.
[0050] To further enhance the turbulence effect, in this embodiment, the heat exchange plate 20 has two adjacent first welding surfaces 211 in the width direction X arranged symmetrically about the second recess 24, so that the first welding surfaces 211 of the two adjacent first protrusions 21 in the width direction X are tilted in opposite directions / set away from each other, which can double the turbulence capability, thereby improving the uniformity of fluid medium distribution and thus doubling the heat exchange performance.
[0051] Second embodiment of plate heat exchanger:
[0052] 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.
[0053] See Figure 13 In this embodiment, the heat exchange plates 20 are arranged in parallel with two adjacent first welding surfaces 211 in the width direction X, that is, with two adjacent first long side shafts 212 in the width direction X. This can enhance the turbulence capability, thereby improving the uniformity of fluid medium distribution and thus improving heat exchange performance.
[0054] Specifically, in the width direction X, the area of the first welding surface 211 of the plurality of first protrusions 21 gradually decreases from one side of the heat exchange plate 20 toward the other side, so that the width of the fluid channel gradually increases from one side to the other side 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 surface 211 gradually decreases. This results in the fluid channel volume being smaller near the inlet and outlet and larger away from the inlet and outlet in the width direction X. Consequently, 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 rate of the fluid medium in the fluid channel more uniformly distributed in the width direction X.
[0055] Third embodiment of plate heat exchanger:
[0056] 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.
[0057] See Figure 14 In this embodiment, the second recesses 24 of two adjacent heat exchange units 28 of the heat exchange plate 20 are connected so that the welding surfaces of the two second recesses 24 are connected to form a third welding surface 241. The third welding surface 241 has a third long side axis 2411 and a third short side axis that are perpendicular to each other. The third long side axis 2411 has a third included angle with the length direction Y, or the third long side axis 2411 extends in the length direction Y, or the third long side axis 2411 extends in the width direction X. Thus, the third long side axis 2411 and the third short side axis of the third welding surface 241 in this embodiment can turbulent the fluid medium in the fluid channel in multiple directions, significantly enhancing the turbulence effect and thereby improving the heat exchange capacity.
[0058] Specifically, when the third long side axis 2411 of the third welding surface 241 has a third included angle with the length direction Y, that is, when the third long side axis 2411 of the third welding surface 241 is inclined relative to the length direction Y and the width direction X, the third welding surfaces 241 of two adjacent heat exchange plates 20 can form full contact welding or intersecting contact partial welding.
[0059] Preferably, in this embodiment, the third long side axis 2411 of the third welding surface 241 has a third included angle with the length direction Y, thereby making the third long side axis 2411 of the third welding surface 241 inclined relative to the width direction X and the length direction Y. Specifically, in this embodiment, the third welding surface 241 is one or more shapes selected from ellipse, rounded rectangle, and rounded rhombus.
[0060] To further enhance the turbulence effect, in this embodiment, the third long side axis 2411 of the third welding surface 241 is arranged parallel to the first long side axis 212 of the first welding surface 211 in the length direction Y. Thus, the turbulence direction of the third welding surface 241 and the first welding surface 211 on the fluid medium is consistent, which significantly enhances the turbulence effect and improves the heat exchange capacity.
[0061] To further enhance the turbulence effect, the first recesses 23 of four adjacent heat exchange units 28 are connected so that the welding surfaces of the four first recesses 23 are connected to form a fourth welding surface 231. The fourth welding surface 231 is square, and two of its corners are arranged side by side in the width direction X, and the other two corners are arranged side by side in the length direction Y. This makes the four sides of the square fourth welding surface 231 inclined relative to the length direction Y and the width direction X, which is more conducive to turbulence and diversion of the fluid medium in the fluid channel, thereby enhancing the turbulence effect and making it more conducive to the uniform distribution of the fluid medium flow, thus improving the heat exchange performance.
[0062] Fourth embodiment of plate heat exchanger:
[0063] 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 third embodiment of the plate heat exchanger.
[0064] See Figure 15 In this embodiment, the heat exchange plates 20 are arranged in parallel with two adjacent first welding surfaces 211 in the width direction X, that is, with two adjacent first long side shafts 212 in the width direction X. This can enhance the turbulence capability, thereby improving the uniformity of fluid medium distribution and thus improving heat exchange performance.
[0065] Furthermore, in this embodiment, the second recesses 24 of two adjacent heat exchange units 28 of the heat exchange plate 20 are connected so that the welding surfaces of the two second recesses 24 are connected to form a third welding surface 241. The third welding surface 241 has a third long side axis 2411 and a third short side axis that are perpendicular to each other. The third long side axis 2411 has a third included angle with the length direction Y. Preferably, in this embodiment, the third long side axis 2411 of the third welding surface 241 is parallel to the first long side axis 212 of the first welding surface 211 in the width direction X. Thus, the third welding surface 241 and the first welding surface 211 have the same disturbance direction on the fluid medium, which significantly enhances the turbulence effect and improves the heat exchange capacity.
[0066] To further enhance the turbulence effect, optionally, the second protrusions 22 of two adjacent heat exchange units 28 of the heat exchange plate 20 are connected, such that the welding surfaces of the two second protrusions 22 are connected to form a second welding surface 221. The second welding surface 221 has a second long side axis and a second short side axis that are perpendicular to each other. The second long side axis has a second included angle with the length direction Y, or the second long side axis extends in the length direction Y, or the second long side axis extends in the width direction X. Specifically, when the second long side axis of the second welding surface 221 has a second included angle with the length direction Y, that is, when the second long side axis of the second welding surface 221 is inclined relative to the length direction Y and the width direction X, the second welding surfaces 221 of two adjacent heat exchange plates 20 can form a full contact weld or an intersecting contact partial weld. Further, the second welding surface 221 can be one or more shapes selected from ellipse, rounded rectangle, and rounded rhombus.
[0067] 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 heat exchange units arranged in the width and length directions of the heat exchange plate, wherein the projection of each heat exchange unit in the height direction of the heat exchange plate is polygonal, and the polygon has at least four sides, characterized in that: Each heat exchange unit has a first protrusion at its center, a first recess at each corner of each heat exchange unit, a second recess at the middle of each side of each heat exchange unit, and a second protrusion at the middle between a first recess and an adjacent second recess. The first convex portion and the second convex portion have the same protrusion direction and protrusion height, the first concave portion and the second concave portion have the same concavity direction and concavity height, and the protrusion direction of the first convex portion and the concavity direction of the first concave portion are set opposite to each other in the height direction.
2. The heat exchange plate according to claim 1, characterized in that: The first welding surface of the first protrusion has a first long side axis and a first short side axis that are perpendicular to each other; The first long side axis has a first included angle with the length direction, or the first long side axis extends in the length direction, or the first long side axis extends in the width direction.
3. The heat exchange plate according to claim 2, characterized in that: The two adjacent first welding surfaces are arranged in parallel in the width direction; Alternatively, two adjacent first welding surfaces in the width direction are symmetrically arranged about the second recess.
4. The heat exchange plate according to claim 1, characterized in that: In the width direction, the area of the first welding surface of the plurality of first protrusions gradually decreases from one side of the heat exchange plate toward the other side of the heat exchange plate.
5. The heat exchange plate according to claim 1, characterized in that: The second protrusions of two adjacent heat exchange units are connected so that the welding surfaces of the two second protrusions are connected to form a second welding surface, and the second welding surface has a second long side axis and a second short side axis that are perpendicular to each other. The second long side axis has a second included angle with the length direction, or the second long side axis extends in the length direction, or the second long side axis extends in the width direction.
6. The heat exchange plate according to claim 1, characterized in that: The second recesses of two adjacent heat exchange units are connected so that the welding surfaces of the two second recesses are connected to form a third welding surface, the third welding surface having a third long side axis and a third short side axis that are perpendicular to each other; The third long side axis has a third included angle with the length direction, or the third long side axis extends in the length direction, or the third long side axis extends in the width direction.
7. The heat exchange plate according to any one of claims 1 to 6, characterized in that: The polygon is a quadrilateral, and each heat exchange unit is provided with one first protrusion, eight second protrusions, four first recesses and four second recesses.
8. The heat exchange plate according to claim 7, characterized in that: The first recesses of four adjacent heat exchange units are connected so that the welding surfaces of the four first recesses are connected to form a fourth welding surface. The fourth welding surface is square, and two of the corners of the fourth welding surface are arranged side by side in the width direction, and the other two corners of the fourth welding surface are arranged side by side in the length direction.
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 the three adjacent heat exchange plates, the first protrusion of the first heat exchange plate is welded to the first protrusion of the second heat exchange plate, and the second protrusion of the first heat exchange plate is welded to the second protrusion of the second heat exchange plate to form a first fluid channel. The first recess of the second heat exchange plate is welded to the first recess of the third heat exchange plate, and the second recess of the second heat exchange plate is welded to 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.