Plate heat exchanger and method of manufacturing a plate heat exchanger

Abstract

This invention discloses a plate heat exchanger comprising multiple stacked heat exchange plates. The plate surface includes a corner hole region and a main heat exchange zone. The corner hole region includes a first corner hole region and a second corner hole region located along the length of the plate surface. The main heat exchange zone is located between the first and second corner hole regions. Both the first and second corner hole regions include end holes. The main heat exchange zone includes a mixed corrugated section, a corrugated top surface, and a corrugated bottom surface. The mixed corrugated section includes S-shaped corrugations and dotted corrugations, which are alternately arranged. The top surface of one of the S-shaped and dotted corrugations is flush with the top surface of the corrugated plate, while the top surface of the other is flush with the bottom surface of the corrugated plate. The main heat exchange zone in this invention has two types of corrugations with different shapes and opposite orientations, increasing the corrugation complexity of the main heat exchange zone, enhancing the turbulence of the fluid between the heat exchange plate layers, and strengthening the heat exchange capacity of the main heat exchange zone, thereby improving the overall heat exchange performance of the plate heat exchanger.

Description

[0001] This application claims priority to Chinese Patent Application No. 202411872132.3, filed on December 18, 2024, entitled "Plate Heat Exchanger and Manufacturing Method Thereof", the entire contents of which are incorporated herein by reference and are hereby declared. Technical Field

[0002] This invention relates to the field of refrigeration equipment, and in particular to a plate heat exchanger and a method for manufacturing a plate heat exchanger. Background Technology

[0003] Plate heat exchangers utilize corrugated structures pressed onto plates, with multiple plates stacked together to form heat exchange channels for fluid flow. The main heat exchange zone, located in the center of the plates, bears the primary heat exchange function. Common corrugated structures in the main heat exchange zone include dotted wave structures and herringbone wave structures. The heat exchange channels formed by the dotted wave structure can increase the degree of fluid turbulence between layers, but it is not conducive to fluid flow between layers, which will correspondingly increase the pressure loss of the plate heat exchanger. The herringbone wave structure is simple to manufacture and has a smaller pressure loss when fluid flows between layers, but its heat exchange effect is relatively worse than that of the dotted wave structure. Summary of the Invention

[0004] To address the problems in the background art, this invention discloses a plate heat exchanger comprising multiple stacked heat exchange plates. The plate surface includes a corner hole region and a main heat exchange zone. The corner hole region includes a first corner hole region and a second corner hole region located along the length of the plate surface, respectively. The main heat exchange zone is located between the first and second corner hole regions. Both the first and second corner hole regions include end holes. The main heat exchange zone includes a mixed corrugated section, a corrugated top surface, and a corrugated bottom surface. The mixed corrugated section includes S-shaped corrugations and dotted corrugations, with the S-shaped corrugations and dotted corrugations spaced apart. The top surface of one of the S-shaped corrugations and the dotted corrugations is flush with the corrugated top surface, and the top surface of the other is flush with the corrugated bottom surface.

[0005] The main heat exchange zone in this invention has two types of corrugations with different shapes and opposite orientations, which increases the complexity of the corrugations in the main heat exchange zone, enhances the turbulence of the fluid between the heat exchange plates, strengthens the heat exchange capacity of the main heat exchange zone, and thus improves the overall heat exchange performance of the plate heat exchanger.

[0006] Furthermore, the present invention proposes a method for manufacturing a plate heat exchanger, comprising the following steps:

[0007] Provide sheet substrates and pressing molds, the pressing molds including upper molds and lower molds;

[0008] The upper and lower molds are pressed together to form herringbone corrugations, S-shaped corrugations, and dotted corrugations on the sheet substrate in one step.

[0009] After pressing and molding, the herringbone corrugations are located on both sides of the heat exchange plate, while the S-shaped corrugations and dotted corrugations are located in the middle of the heat exchange plate.

[0010] The manufacturing method of the plate heat exchanger in this invention allows for high forming efficiency when the heat exchange plates are pressed together, with the herringbone corrugations on both sides of the heat exchange plates being pressed together with the S-shaped corrugations and dotted corrugations in the middle of the heat exchange plates. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall heat exchange plates in this invention;

[0012] Figure 2 This is a schematic diagram of the structure of the first heat exchange plate in this invention;

[0013] Figure 3 for Figure 2 A magnified view of a portion of position A in the middle;

[0014] Figure 4 This is a schematic diagram of the structure of the second heat exchange plate in this invention;

[0015] Figure 5 for Figure 4 A magnified view of a portion of position B in the middle;

[0016] Figure 6 This is a schematic diagram of the structure of the dot-shaped unit and the S-shaped unit in this invention;

[0017] Figure 7 This is a top view of the dot-shaped unit and the S-shaped unit in this invention;

[0018] Figure 8 This is a schematic diagram of the S-shaped ripples in this invention;

[0019] Figure 9 This is a schematic diagram of the dotted ripples in this invention;

[0020] Figure 10 This is a schematic diagram of the heat exchange plate assembly in this invention;

[0021] Figure 11 This is a cross-sectional schematic diagram of the heat exchange plate assembly in this invention.

[0022] In the picture:

[0023] 1. Heat exchange plate; 10. Plate surface; 11. Corner hole area; 110. Port plane; 1101. Port hole; 111. First corner hole area; 112. Second corner hole area; 101. Herringbone corrugation; 12. Main heat exchange zone; 120. Mixing corrugated section; 1011. Corrugated top surface; 1012. Corrugated bottom surface;

[0024] 102. S-shaped ripples; 1020. S-shaped unit; 1021. Wavy plane; 103. Dotted ripples; 1030. Dotted unit; 1031. Circular plane; 1032. Arc-shaped transition section;

[0025] 13. Boundary section; 131. First boundary section; 1310. Boundary protrusion; 132. Second boundary section; 1320. Connecting rib;

[0026] 2. Heat exchanger plate assembly; 21. First heat exchanger plate; 210. First flow channel; 22. Second heat exchanger plate; 220.

[0027] Second flow channel. Detailed Implementation

[0028] The embodiments of the present invention will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0029] In the accompanying drawings, shapes and dimensions may be enlarged for clarity, and the same reference numerals will be used in all figures to indicate the same or similar parts.

[0030] This invention provides a plate heat exchanger, such as... Figures 1 to 11 As shown, this type of plate heat exchanger includes multiple stacked heat exchange plates 1. The plate surface 10 of the heat exchange plate 1 includes a corner hole region 11 and a main heat exchange zone 12. The corner hole region 11 includes a first corner hole region 111 and a second corner hole region 112 located at both ends of the plate surface 10 along its length. The main heat exchange zone 12 is located between the first corner hole region 111 and the second corner hole region 112. The corner hole region 11 includes a port hole 1101 and a port plane portion 110 surrounding the port hole 1101. The corner hole region 11 is arranged with herringbone corrugations 101. The main heat exchange zone 12 includes a mixed corrugated portion 120, a corrugated top surface 1011, and a corrugated bottom surface 1012. The mixed corrugated portion 120 is arranged with S-shaped corrugations 102 and dotted corrugations 103. S-shaped corrugations 102 and dotted corrugations 103 are arranged alternately; the top surface of one of the S-shaped corrugations 102 and the dotted corrugations 103 is flush with the top surface 1011 of the corrugation, and the top surface of the other is flush with the bottom surface 1012 of the corrugation.

[0031] Through the above structural design, the main heat exchange zone of the present invention has S-shaped corrugations 102 and dotted corrugations 103 with different shapes and opposite convex orientations, which increases the corrugation complexity of the main heat exchange zone, enhances the turbulence of the fluid between the heat exchange plates, strengthens the heat exchange capacity of the main heat exchange zone, and thus improves the overall heat exchange performance of the plate heat exchanger.

[0032] Furthermore, along the length of the main heat exchange zone 12, S-shaped corrugations 102 and dotted corrugations 103 are arranged at equal intervals. The corner hole region 11 includes a port plane portion 110 and a herringbone corrugation 101. The port plane portion 110 is arranged around the port hole 1101, and the herringbone corrugation 101 extends from one end to the other end along the length of the corner hole region 11.

[0033] Specifically, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the herringbone corrugations 101 in the corner hole region 11 extend in both the length and width directions of the corner hole region 11. The mixed corrugated section 120 of the main heat exchange zone 12 has S-shaped corrugations 102 and dotted corrugations 103 spaced apart, with the S-shaped corrugations 102 and dotted corrugations 103 arranged in alternating rows along the length direction of the plate surface 10. Compared to a single type of corrugated plate, the mixed corrugated section 120 can increase the turbulence of the fluid and achieve higher heat exchange efficiency. The herringbone corrugations 101 in the corner hole region 11 provide less resistance to the fluid compared to mixed corrugations, and facilitate the rapid and smooth distribution of the fluid to both sides of the plate surface 10 in the width direction.

[0034] Secondly, the fluid pressure in the corner hole area is relatively high, requiring good weldability when welding the heat exchange plates. Compared to mixed corrugations, the herringbone corrugation structure has less deformation during pressing, which is more conducive to maintaining the flatness of the port hole position. Specifically, the herringbone corrugations 101 are arranged from one edge of the corner hole area 11 along its length to the boundary between the corner hole area 11 and the main heat exchange zone 12, and at least a portion of the herringbone corrugations 101 is located between the port plane portion 110 and the main heat exchange zone 12. In the plate heat exchanger, the port holes 1101 of adjacent heat exchange plates 1 are sealed by welding the opposing port plane portions 110 together. When the opposing port plane portions 110 are spaced apart, the corner holes at that position are connected, and the fluid channel is open. Therefore, the welding of the port plane portions 110 determines the sealing reliability of the inter-plate channel. If there is a false weld or a missed weld, there is a risk of interlayer fluid leakage. Maintaining the flatness of the port plane 110 is beneficial for ensuring welding quality. The flatness of the port plane 110 is related to the amount of deformation during the pressing of the heat exchange plate 1. Compared with the mixed corrugations, the herringbone corrugations 101 have less deformation. By setting the herringbone corrugations 101 between the port plane 110 and the mixed corrugated portion 120, the large deformation of the plate surface 10 during the pressing of the mixed corrugations can be prevented from affecting the flatness of the port plane 110. Furthermore, since the port plane 110 and the mixed corrugated portion 120 are separated by the herringbone corrugations 101, the corrugation structure density of the mixed corrugated portion 120 can be appropriately increased, for example, by using a smaller corrugation width, to improve heat exchange performance; while the density of the herringbone corrugations 101 can be appropriately reduced. On the one hand, this reduces the deformation of the corner hole area 11, and on the other hand, the area of ​​the weld joint in the corner hole area 11 can be increased by appropriately increasing the width of the herringbone corrugations 101, thus ensuring welding strength.

[0035] Furthermore, such as Figure 3 , Figure 5 As shown, the plane containing the highest point of the closed surface in the mixed corrugated section 120 is defined as the corrugated top surface 1011, and the plane containing the lowest point of the open surface is defined as the corrugated bottom surface 1012. The distance between the corrugated top surface 1011 and the corrugated bottom surface 1012 is defined as H. The corrugation height of the herringbone corrugation 101 is defined as H1, the corrugation height of the S-shaped corrugation 102 is defined as H2, and the corrugation height of the dotted corrugation 103 is defined as H3. The corrugation heights of the three types of corrugations are the same and equal to the distance between the corrugated top surface 1011 and the corrugated bottom surface 1012, i.e., H1=H2=H3=H. Specifically, taking... Figure 3 For example, the S-shaped corrugations 102 and the dotted corrugations 103 have opposite convex directions. That is, the trough plane of the S-shaped corrugations 102 is the crest plane of the dotted corrugations 103, and is located on the top surface 1011 of the corrugations together with the trough plane of the herringbone corrugations 101; the crest plane of the S-shaped corrugations 102 is the trough plane of the dotted corrugations 103, and is located on the bottom surface 1012 of the corrugations together with the crest plane of the herringbone corrugations 101.

[0036] The dotted corrugations 103 include multiple dotted units 1030, and the S-shaped corrugations 102 include multiple S-shaped units 1020. Two adjacent dotted units 1030 are smoothly transitioned by an arc-shaped transition section 1032. Each S-shaped corrugation 102 unit is adjacent to two dotted units 1030. The top surface of the dotted unit 1030 is a circular plane 1031, with a diameter defined as e and a height defined as H3, then 0.5H3≤e≤2H3. The top surface of the S-shaped corrugations 102 is a wave-shaped plane 1021 of equal width, with a width defined as W and a height defined as H2, then H2≤W≤2H2. ​​Through this structural design, the welding surfaces of the dotted corrugations 103 and S-shaped corrugations 102 have sufficient welding area, ensuring the welding strength of the welded structure.

[0037] In the main heat exchange zone, the S-shaped corrugations and dotted corrugations are arranged at intervals with opposite directions of elevation. That is, the top plane of the dotted corrugations is the bottom plane of the S-shaped corrugations. When multiple heat exchange plates are welded together, the dotted corrugations on different plates face each other and are welded together, and the S-shaped corrugations face each other and are welded together, forming heat exchange channels with different flow volumes to further improve the heat exchange performance of the plate heat exchanger. For example... Figure 6 , Figure 8 , Figure 9 , Figure 10 , Figure 11 As shown, when multiple heat exchange plates 1 are welded together, the dotted corrugations 103 of different plates are opposite to each other and welded together, and the S-shaped corrugations 102 are opposite to each other and welded together. The interlayer flow channel volume of the S-shaped corrugations 102 welded together is smaller, that is, the volumes of two adjacent interlayer flow channels are not equal. The flow channel with the smaller volume serves as the high-pressure chamber and is defined as the first flow channel 210; the flow channel with the larger volume serves as the low-pressure chamber and is defined as the second flow channel 220. The first flow channel 210 and the second flow channel 220 are arranged alternately, which can improve the heat exchange efficiency while reducing the charge of high-pressure fluids, such as refrigerant. Furthermore, at the interlayer flow channel position corresponding to the mixed corrugated section 120, the top plane of the corrugated structure that is not a welding surface is opposite to each other and becomes the largest flow channel volume in this area. The arc transition section 1032 plays a throttling role relative to the largest flow channel volume. When the fluid flows through the arc transition section 1032, the turbulence increases, further improving the heat exchange performance of the plate heat exchanger.

[0038] Specifically, such as Figure 3 , Figure 5 , Figure 6 , Figure 7As shown, the S-shaped corrugations 102 are composed of multiple continuous S-shaped units 1020, and the dotted corrugations 103 are composed of multiple dotted units 1030 arranged at equal intervals. Each S-shaped corrugation 102 unit has two curved portions facing opposite directions, and each curved portion corresponds to a dotted corrugation 103 unit. The S-shaped corrugations 102 and dotted corrugations 103 can be arranged evenly and closely spaced from each other. The arc-shaped bottom edge of the dotted unit 1030 is exactly the curved edge of the top surface of the S-shaped unit 1020, which can maximize the utilization of the plate surface 10 area where the mixed corrugated portion 120 is located and increase the heat exchange surface area.

[0039] Furthermore, in one embodiment, such as Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown in the figure, the shaded areas indicate the locations of the weld points. The blade-shaped shaded areas represent the weld points of the S-shaped corrugations, and the circular shaded areas represent the weld points of the dotted corrugations. Along the length of the plate surface 10, the weld points of the dotted corrugations 103 are located on parallel and evenly spaced straight lines, while the weld points of the S-shaped corrugations 102 are located between two alternate rows of dotted corrugations 103. The top surface of the S-shaped corrugations 102 is a wave-shaped plane 1021 of equal width, and the weld points of the S-shaped corrugations 102 are the straight transition sections between the two curved parts of the S-shaped unit 1020. When the S-shaped corrugations 102 on adjacent heat exchange plates 1 are welded to each other, the weld points appear as strip-shaped surfaces of a certain length, thereby greatly increasing the welding strength of the S-shaped corrugations 102. When the interlayer flow channels of the S-shaped corrugations 102 welded to each other serve as high-pressure chambers, the strip-shaped welding surfaces with a certain area can withstand the pressure of the high-pressure fluid, preventing the high fluid pressure from breaking through the welded structure and causing welding failure. Meanwhile, the number of welding points of the dotted corrugations 103 is the same as the number of welding points of the S-shaped corrugations 102 and their positions correspond, which is beneficial to the welding uniformity of the overall structure of the heat exchange plate 1.

[0040] Furthermore, such as Figure 2 , Figure 4As shown, the herringbone corrugations 101 can be considered as parallel "V"-shaped bend patterns symmetrical about the centerline of the width direction of the plate surface 10. In the mixed corrugation section 120, the S-shaped corrugations 102 and the dotted corrugations 103 are arranged parallel to each other along a "V"-shaped path that approximates the bend pattern of the herringbone corrugations 101. That is, the S-shaped corrugations 102 and the dotted corrugations 103 are symmetrical about the centerline in the width direction of the plate surface 10, and their arrangement direction in the length direction of the plate surface 10 is the same as the angle of the herringbone corrugations 101. The angle of the herringbone corrugations 101 is defined as a, the bend angle of the S-shaped corrugations 102 is defined as b, and the bend angle of the dotted corrugations 103 is defined as c. Optionally, the bend angle b of the S-shaped corrugations 102 and the bend angle c of the dotted corrugations 103 can be the same as or different from the angle a of the herringbone corrugations 101. When the angles are the same, the arrangement paths of the herringbone corrugations 101, S-shaped corrugations 102, and dotted corrugations 103 are parallel to each other; when the angles are different, for example, when the bend angle b of the S-shaped corrugations 102 and the bend angle c of the dotted corrugations 103 are increased relative to the opening angle a of the herringbone corrugations 101, the angle of the mixed corrugation section 120 is gentler, and a greater flow resistance will be obtained relative to the herringbone corrugations 101 section; or when the bend angle b of the S-shaped corrugations 102 and the bend angle c of the dotted corrugations 103 are decreased, the flow resistance of the mixed corrugation section 120 is appropriately reduced. Through the above structural design, the flow resistance of the main heat exchange zone 12 can be adjusted by controlling the bend angle of the mixing corrugated section 120 to adapt to different plate sizes 10. For example, in plate heat exchangers with smaller plate sizes 10, the main heat exchange zone 12 has a larger flow resistance due to the mixing corrugated design itself. Therefore, the bend angle b of the S-shaped corrugation 102 and the bend angle c of the dotted corrugation 103 can be set smaller than the angle a of the herringbone corrugation 101 to increase the fluid flow rate through the main heat exchange zone 12. In plate heat exchangers with larger plate sizes 10, the bend angle b of the S-shaped corrugation 102 and the bend angle c of the dotted corrugation 103 can be appropriately increased to slow down the fluid flow rate in the main heat exchange zone 12 to achieve sufficient heat exchange. In this type of structural design, the blank junction formed by the angular deviation between the herringbone corrugation 101 and the mixed corrugation section 120 can be compensated by using intermittent herringbone corrugations 101, S-shaped corrugations 102 or dotted corrugations 103 to ensure the uniformity of the structure and solder joints of the entire board.

[0041] Furthermore, the angle of the herringbone corrugations 101 is preferably 110°~150°, at which the fluid velocity and heat exchange efficiency are relatively balanced. Similarly, the herringbone corrugation 101 structure is not limited to a single herringbone wave, but can also be a double or multiple herringbone wave, i.e., a "W" shaped corrugation. The corresponding S-shaped corrugations 102 and dotted corrugations 103 are also arranged in a "W" shape as described above.

[0042] In one embodiment, such as Figure 2 , Figure 4 , Figure 6 , Figure 10 , Figure 11 As shown, the plate heat exchanger includes a stacked heat exchange plate group 2, which includes a first heat exchange plate 21 and a second heat exchange plate 22. The first heat exchange plate 21 and the second heat exchange plate 22 are arranged according to the aforementioned heat exchange plate 1 structure, that is, the first heat exchange plate 21 is the aforementioned heat exchange plate 1, and the second heat exchange plate 22 is also the aforementioned heat exchange plate 1. The plate surfaces 10 of the first heat exchange plate 21 and the second heat exchange plate 22 include a dividing portion 13, which is located between the corner hole region 11 and the main heat exchange region 12. The dividing portion 13 is also arranged along a "V" shaped path similar to the herringbone corrugations 101. The angle of the dividing portion 13 is defined as d. The angle d of the dividing portion 13 is equal to the angle a of the herringbone corrugations 101 and has the same direction. The herringbone corrugations 101 and the dotted corrugations 103 located adjacent to the dividing portion 13 are spaced apart from each other; or the angle d of the dividing portion 13 is equal to the angle a of the herringbone corrugations 101 and has the opposite direction. The herringbone corrugations 101 and the dotted corrugations 103 located adjacent to the dividing portion 13 are connected to each other.

[0043] Specifically, such as Figure 2 , Figure 3 As shown, the dividing portion 13 located on the first heat exchange plate 21 is defined as the first dividing portion 131. The angle of the first dividing portion 131 is parallel to the angle of the herringbone corrugation 101, that is, the angle is equal to and the direction is the same as the angle of the herringbone corrugation 101. The first dividing portion 131 includes a dividing protrusion 1310, which is disposed between the herringbone corrugation 101 and the dotted corrugation 103 at a position adjacent to the first dividing portion 131. In a further design, the dividing protrusion 1310 is at the same height as the herringbone corrugation 101 and the S-shaped corrugation 102, both with a height of H. The side of the dividing protrusion 1310 near the dotted corrugation 103 is set to a wave shape that is the same as the S-shaped corrugation 102 and corresponds to the dotted corrugation 103.

[0044] like Figure 4 , Figure 5 As shown, the boundary 13 located on the second heat exchange plate 22 is defined as the second boundary 132. The angle of the second boundary 132 is equal to and opposite in direction to the angle of the herringbone corrugation 101. The second boundary 132 includes a connecting rib 1320. The herringbone corrugation 101 and the dotted corrugation 103 located adjacent to the second boundary 132 are connected to each other by the connecting rib 1320. The height of the connecting rib 1320 is 25% to 75% of the height H of the dotted corrugation 103. The internal flow channels of the herringbone corrugation 101 and the internal flow channels of the dotted corrugation 103 are connected by the connecting rib 1320 structure.

[0045] Furthermore, such as Figure 2 , Figure 4 , Figure 10, Figure 11 As shown, when the heat exchange plate group 2 is stacked, the adjacent first heat exchange plate 21 and second heat exchange plate 22 have opposite herringbone wave inclination directions, and the boundary 13 is in the same position; in the three continuously stacked heat exchange plates 1, the dot-shaped corrugations 103 on the two adjacent heat exchange plates 1 are welded to each other, and the S-shaped corrugations 102 on the other two adjacent heat exchange plates 1 are welded to each other. At this time, in the first dividing part 131 and the second dividing part 132 corresponding to the position, since the angle direction of the herringbone corrugation 101 and the S-shaped corrugation 102 on the adjacent second heat exchange plate 22 is opposite, the dividing part 1310 will contact and weld the herringbone corrugation 101 and the S-shaped corrugation 102 at the corresponding position on the adjacent plate; on the other hand, since the height of the connecting rib 1320 is 25% to 75% of the height H of the dotted corrugation 103, when the dotted corrugations 103 on the adjacent first heat exchange plate 21 and the second heat exchange plate 22 are welded to each other, the connecting rib 1320 does not contact the plates on both sides, and can provide a flow channel for the fluid at its position.

[0046] Through the above structural design, when the heat exchange plate group 2 is stacked, the mixed corrugated portion 120 on the adjacent heat exchange plate 1 achieves regional position correspondence through the relative first dividing portion 131 and second dividing portion 132. Therefore, the dot-shaped corrugations 103 in the relative mixed corrugated portion 120 on the first heat exchange plate 21 and the second heat exchange plate 22 can achieve positional correspondence between the dot-shaped unit 1030 and the dot-shaped unit 1030 and weld to each other, preventing the problem of positional misalignment and incomplete welding. Similarly, the S-shaped unit 1020 can also correspond to the position of the S-shaped unit 1020 to ensure the integrity of the welding surface and ensure reliable welding at the welding position.

[0047] In one embodiment, the present invention also provides a method for manufacturing a plate heat exchanger, comprising the following steps:

[0048] Provide sheet substrates and pressing molds, the pressing molds including upper molds and lower molds;

[0049] The upper and lower molds are pressed together to form herringbone corrugations 101, S-shaped corrugations 102 and dotted corrugations 103 on the sheet substrate in one step.

[0050] After being pressed and formed, the herringbone corrugations 101 are located on both sides of the heat exchange plate 1, while the S-shaped corrugations 102 and the dotted corrugations 103 are located in the middle of the heat exchange plate 1.

[0051] Specifically, the surface 10 of the formed heat exchange plate 1 includes a corner hole region 11 and a main heat exchange zone 12. The corner hole region 11 includes a first corner hole region 111 and a second corner hole region 112 located at both ends along the length direction. The main heat exchange zone 12 is located between the first corner hole region 111 and the second corner hole region 112. The first corner hole region 111 and the second corner hole region 112 include herringbone corrugations 101. The mixed corrugated portion 120 includes S-shaped corrugations 102 and dotted corrugations 103. The corner hole region 11 and the main heat exchange zone 12 are pressed together. Port holes 1101 are punched in the first corner hole region 111 and the second corner hole region 112.

[0052] Furthermore, the dotted corrugations 103 include multiple dotted units 1030, and two adjacent dotted units 1030 are smoothly transitioned by an arc-shaped transition section 1032. The top surface of the S-shaped corrugations 102 is a wave-shaped plane 1021 of equal width. Along the length direction of the plate substrate, the S-shaped corrugations 102 and the dotted corrugations 103 are arranged at equal intervals.

[0053] One of the upper mold and the lower mold includes evenly arranged dot-shaped protrusions, and the other includes spaced S-shaped protrusions, with the projections of the dot-shaped protrusions and the S-shaped protrusions spaced apart from each other in the pressing direction.

[0054] The dotted unit 1030 is formed by pressing dotted protrusions, and the S-shaped corrugation 102 is formed by pressing S-shaped convex strips. During the pressing process of the dotted unit 1030, the arc-shaped connecting section 1032 is formed by stretching the plate substrate.

[0055] Specifically, the projections of the dot-shaped protrusions and S-shaped ridges in the pressing direction are spaced apart from each other, thereby pressing out dot-shaped corrugations 103 and S-shaped corrugations 102 with opposite protrusion directions during the pressing of the heat exchange plate 1. The S-shaped ridges press the S-shaped corrugations 102 into shape, and the spaced dot-shaped protrusions press the dot-shaped corrugations 103 into shape. At the same time, a smooth arc transition section 1032 is naturally formed between adjacent protrusions in the dot-shaped corrugations 103 through the stretching deformation of the plate. Through the above structural design, the lower mold and upper mold used to press the heat exchange plate 1 are respectively provided with a part for pressing the protrusion on one side of the herringbone corrugation 101 (such as the corrugation top surface 1011) and a part for pressing the dotted corrugation 103, and the other part is provided with a part for pressing the protrusion on the other side of the herringbone corrugation 101 (such as the corrugation bottom surface 1012) and a part for pressing the S-shaped corrugation 102. The two corrugation structures of the mixed corrugation part 120 are separated into two molds, simplifying the mold design and improving the reliability of pressing the corrugation shape.

[0056] Furthermore, in one embodiment, in the mold for pressing the heat exchange plate 1 with the dividing protrusion 1310, an upper mold of corresponding shape is provided at the position of the dividing protrusion 1310 to press the dividing protrusion 1310, which has different structures on both sides and is at the same height as the herringbone corrugation 101 and the S-shaped corrugation 102, to ensure its shape accuracy. In another mold for pressing the plate with connecting ribs 1320, it is not necessary to provide a half-height protrusion at the position of the connecting rib 1320. Instead, the connecting rib 1320 is formed between the herringbone corrugation 101 and the dotted corrugation 103 by the stretching deformation of the heat exchange plate 1, resulting in a natural transition. The position of the connecting rib 1320 can also be adaptively changed according to the density of the dotted corrugation 103.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the technical solutions formed by the combination of these technical features do not contradict each other, they should be considered to be within the scope of this specification.

[0058] The above examples illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely for the purpose of helping to understand the technical solutions and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A plate heat exchanger comprising multiple stacked heat exchange plates (1), wherein the plate surface (10) of the heat exchange plates (1) includes a corner hole region (11) and a main heat exchange region (12), characterized in that: The corner hole region (11) includes a first corner hole region (111) and a second corner hole region (112) located along the length of the plate surface (10). The main heat exchange zone (12) is located between the first corner hole region (111) and the second corner hole region (112). Both the first corner hole region (111) and the second corner hole region (112) include port holes (1101). The main heat exchange zone (12) includes a mixed corrugated section (1101). 20) A corrugated top surface (1011) and a corrugated bottom surface (1012). The mixed corrugated part (120) includes S-shaped corrugations (102) and dotted corrugations (103). The S-shaped corrugations (102) and the dotted corrugations (103) are spaced apart. The top surface of one of the S-shaped corrugations (102) and the dotted corrugations (103) is flush with the corrugated top surface (1011), and the top surface of the other is flush with the corrugated bottom surface (1012).

2. The heat exchanger as described in claim 1, characterized in that, The dotted ripples (103) include multiple dotted units (1030), and the S-shaped ripples (102) include multiple S-shaped units (1020). Two adjacent dotted units (1030) are smoothly transitioned by an arc-shaped transition section (1032). Each S-shaped ripple (102) unit is adjacent to two dotted units (1030).

3. The plate heat exchanger as described in claim 1 or 2, characterized in that, The top surface of the dotted ripples (103) is a circular plane (1031). The diameter of the circular plane (1031) is defined as e, and the height of the dotted ripples (103) is defined as H3. Then, 0.5H3≤e≤2H3.

4. The plate heat exchanger as described in any one of claims 1-3, characterized in that, The top surface of the S-shaped ripple (102) is a wave-shaped plane (1021) of equal width. The width of the wave-shaped plane (1021) is defined as W, and the height of the S-shaped ripple (102) is defined as H2. Then, H2≤W≤2H2.

5. The plate heat exchanger as described in any one of claims 1-4, characterized in that, Along the length of the main heat exchange zone (12), the S-shaped corrugations (102) and the dotted corrugations (103) are arranged at equal intervals.

6. The plate heat exchanger as described in any one of claims 1-5, characterized in that, The corner hole region (11) includes a port plane portion (110) and a herringbone corrugation (101). The port plane portion (110) is arranged around the port hole (1101). The herringbone corrugation (101) extends from one end of the length direction of the corner hole region (11) to the other end. At least a portion of the herringbone corrugation (101) is located between the port plane portion (110) and the main heat exchange zone (12).

7. The plate heat exchanger as described in claim 6, characterized in that, If we define the angle of the herringbone ripple (101) as a, then 110°≤a≤150°.

8. The plate heat exchanger as described in claim 6 or 7, characterized in that, The plate surface (10) includes a dividing part (13) located between the corner hole area (11) and the main heat exchange area (12). The dividing part (13) has an angle, and the angle of the dividing part (13) is parallel to the angle of the herringbone corrugation (101). The herringbone corrugation (101) and the dotted corrugation (103) located adjacent to the dividing part (13) are spaced apart from each other; or the angle of the dividing part (13) is equal to the angle of the herringbone corrugation (101) and opposite in direction. The herringbone corrugation (101) and the dotted corrugation (103) located adjacent to the dividing part (13) are connected to each other.

9. The plate heat exchanger as described in claim 6 or 7, characterized in that, The plate surface (10) includes a dividing part (13), which is located between the corner hole area (11) and the main heat exchange area (12). The dividing part (13) has an angle, and the angle of the dividing part (13) is equal to and opposite to the angle of the herringbone corrugation (101). The dividing part (13) includes a connecting rib (1320), and the herringbone corrugation (101) and the dotted corrugation (103) located adjacent to the dividing part (13) are connected to each other by the connecting rib (1320). The height of the connecting rib (1320) is 25% to 75% of the height of the dotted corrugation (103).

10. The plate heat exchanger as described in claim 8 or 9, characterized in that, When the heat exchange plates (1) are stacked, the inclination directions of the herringbone corrugations (101) in two adjacent heat exchange plates (1) are opposite, and the positions of the dividing parts (13) coincide; in three consecutively stacked heat exchange plates (1), the dotted corrugations (103) on two adjacent heat exchange plates (1) are welded to each other, and the S-shaped corrugations (102) on two other adjacent heat exchange plates (1) are welded to each other.

11. A method for manufacturing a plate heat exchanger, characterized in that, Includes the following steps: A sheet substrate and a pressing mold are provided, wherein the pressing mold includes an upper mold and a lower mold; The upper mold and the lower mold are pressed together to form herringbone corrugations (101), S-shaped corrugations (102) and dotted corrugations (103) on the plate substrate in one step. The herringbone corrugations (101) after pressing and molding are located on both sides of the heat exchange plate (1), while the S-shaped corrugations (102) and the dotted corrugations (103) are located in the middle of the heat exchange plate (1).

12. The method for manufacturing a plate heat exchanger as described in claim 11, characterized in that, The dotted corrugations (103) include multiple dotted units (1030), and two adjacent dotted units (1030) are smoothly transitioned by an arc-shaped transition section (1032). The top surface of the S-shaped corrugations (102) is a wave-shaped plane (1021) of equal width. Along the length direction of the plate substrate, the S-shaped corrugations (102) and the dotted corrugations (103) are arranged at equal intervals. One of the upper mold and the lower mold includes uniformly arranged dot-shaped protrusions, and the other includes spaced S-shaped protrusions, with the projections of the dot-shaped protrusions and the S-shaped protrusions in the pressing direction spaced apart from each other. The dotted unit (1030) is formed by pressing the dotted protrusions, and the S-shaped corrugation (102) is formed by pressing the S-shaped convex strip. During the pressing process, the dotted unit (1030) is formed by stretching the plate substrate to form the arc-shaped connecting section (1032).

Images