Plate Heat Exchanger

Abstract

The present application provides a plate heat exchanger, wherein the plate is provided with a main heat exchange area, the plate is provided with a plurality of corrugated structures arranged at intervals, the plurality of corrugated structures form a plurality of crests and a plurality of troughs, the crests and troughs are arranged alternately, two adjacent troughs have the same or different depths, and the depth of the trough is calculated based on the crests; along the vertical arrangement direction of the corrugated structure, the corrugated structure includes at least two straight portions and one curved portion; the curved portion is located between two adjacent straight portions, two adjacent straight portions and the curved portion located therebetween form a herringbone corrugated pattern, and the curved portion forms the corner of the herringbone corrugated pattern; at least one curved portion is provided with a connecting portion, the connecting portion at least partially penetrates the curved portion in the arrangement direction of the corrugated structure, the connecting portion connects two adjacent troughs, and the plate is formed with a flow channel for fluid to pass through the crest portion through the connecting portion. The present application is conducive to improving the heat exchange performance of the plate heat exchanger.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange, and in particular to a plate heat exchanger. Background Art

[0002] Plate heat exchangers are recognized as efficient and compact liquid-cooled heat exchangers, and are widely used in refrigeration and air conditioning, new energy vehicles and other industries. In related technologies, the plates of plate heat exchangers are provided with herringbone wave patterns. When adjacent plates are welded, large welding spots that are not conducive to fluid flow are easily formed at the sharp corners of the herringbone wave patterns, resulting in uneven distribution of fluid on the plates of the plate heat exchanger, which reduces the effective heat exchange area of ​​the plates, that is, the plate surface utilization rate is low. This affects the heat exchange performance of the plate heat exchanger. Summary of the invention

[0003] The present application provides a plate heat exchanger, comprising a plurality of plates, wherein the plurality of plates comprises a plurality of first plates and a plurality of second plates, wherein the plurality of first plates and the plurality of second plates are alternately arranged, and each plate comprises a front side and a back side opposite to each other, wherein the front side of the first plate is opposite to the back side of the second plate, and the back side of the first plate is opposite to the front side of the second plate; each of the plates is provided with a main heat exchange area, wherein the plate is provided with a plurality of corrugated structures spaced apart along the length direction of the plate, and the plurality of corrugated structures are spaced apart along the length direction of the plate The plurality of crests and troughs are formed in the direction of the wave, the plurality of crests and the plurality of troughs are arranged alternately, two adjacent troughs have the same or different depths, and the depth of the trough is calculated based on the crests; the corrugated structure comprises at least two straight portions and one curved portion; the curved portion is connected between two adjacent straight portions, and the extension directions of the two adjacent straight portions intersect, so that the two adjacent straight portions and the curved portion located therebetween form a herringbone corrugated pattern, and the curved portion forms the corner of the herringbone corrugated pattern;

[0004] Among them, for at least one plate among the multiple plates, among the multiple curved portions of the multiple corrugated structures, at least one curved portion is provided with a connecting portion, and the connecting portion at least partially penetrates the curved portion in the length direction of the plate, and the connecting portion connects two adjacent trough portions separated by the corrugated structure, and the plate forms a flow channel for fluid to pass through the peak portion located between the two adjacent trough portions through the connecting portion.

[0005] The present application improves the channel structure formed by the plates of a plate heat exchanger, and at least one bent portion of the corrugated structure is provided with a connecting portion, which connects two adjacent trough portions separated by the corrugated structure, so that the plate forms a flow channel that can pass through the crest portion, that is, the fluid can directly reach another trough portion adjacent to the trough portion from one trough portion through the flow channel, thereby reducing the influence of the welding point of the bent portion on the fluidity of the fluid, improving the fluidity of the fluid in the middle part of the herringbone corrugated pattern, and further improving the uniformity of the distribution of the fluid on the plates of the plate heat exchanger, thereby improving the heat exchange performance of the plate heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 A schematic diagram of the structure of the plate heat exchanger provided for this application;

[0007] Figure 2 A schematic diagram of the structure of the first plate provided in this application;

[0008] Figure 3 For this application Figure 2 An enlarged schematic diagram of the front structure of the first plate;

[0009] Figure 4 For this application Figure 2 A schematic diagram of a partial cross-section of the first plate in the AA direction;

[0010] Figure 5 A schematic diagram of an assembly structure of a first plate and a second plate provided in the present application;

[0011] Figure 6 For this application Figure 2 Another enlarged schematic diagram of the structure of the first plate;

[0012] Figure 7 A schematic diagram of the structure of another first plate provided in this application;

[0013] Figure 8 For this application Figure 7 An enlarged schematic diagram of the front structure of the first plate;

[0014] Fig. 9 For this application Figure 7 A schematic cross-sectional view of the first plate in the BB direction;

[0015] Fig.10 The application provided Figure 7 A schematic structural diagram of a second plate assembled in conjunction with the first plate;

[0016] Fig.11 For this application Fig.10 An enlarged schematic diagram of the front structure of the second plate;

[0017] Fig.12 For this application Fig.10 A schematic cross-sectional view of the second plate in the CC direction;

[0018] Fig.13 For this application Figure 7 Another enlarged schematic diagram of the structure of the first plate;

[0019] Fig.14 For this application Figure 7 The first plate and Fig. 9 Schematic diagram of the assembly structure of the second plate. DETAILED DESCRIPTION

[0020] In the prior art, when two plates of a plate heat exchanger are stacked together, there is generally a large welding point at the sharp corner of the herringbone wave pattern, which results in less fluid flow at the sharp corner, or even no fluid passing through to form a flow dead zone, resulting in uneven distribution of fluid flow on the plate, reducing the heat exchange performance of the plate heat exchanger. The plate heat exchanger provided by the present application improves the channel structure formed by the corrugated structure on the plate, which is conducive to reducing the distribution difficulty of the fluid when it flows near the curved part of the corrugated structure, improving the uniformity of the fluid flow on the plate, and thus improving the heat exchange performance of the plate heat exchanger.

[0021] like Figures 1 to 14 As shown, the embodiment of the present application provides a plate heat exchanger 10, including a plurality of plates 100, the plurality of plates 100 are stacked to form a flow channel for two non-connected fluids to flow, the plurality of plates 100 include a plurality of first plates 101 and a plurality of second plates 102, and the plurality of first plates 101 and the plurality of second plates 102 are alternately arranged. Each plate 100 includes a front side 1001 and a back side 1002 opposite to each other, the front side 1001 of the first plate 101 is opposite to the back side 1002 of the second plate 102, and the back side 1002 of the first plate 101 is opposite to the front side 1001 of the second plate 102.

[0022] Of course, the plate heat exchanger 10 product may also include external pipes corresponding to the two fluids. The external pipes corresponding to the two fluids may be located on the same side or different sides of the thickness direction of the plate heat exchanger 10. Figure 1 In the figure, the external pipes are shown as being located on different sides of the plate heat exchanger 10.

[0023] The plate 100 of the plate heat exchanger 10 provided in the present application is provided with a main heat exchange zone 1 in the middle of the plate 100. In the main heat exchange zone 1, the plate 100 is provided with a plurality of corrugated structures 2 arranged at intervals along the length direction of the plate 100. The plurality of corrugated structures 2 form a plurality of peaks 21 and a plurality of troughs 22 along the arrangement direction of the corrugated structures 2. The peaks 21 and the troughs 22 are alternately arranged. Two adjacent troughs 22 have the same or different depths. The depth of the trough 22 is calculated based on the peaks 21.

[0024] The corrugated structure 2 includes at least two straight portions 23 and a curved portion 24. The curved portion 24 is located between two adjacent straight portions 23, and the extension directions of the two adjacent straight portions 23 intersect, so that the two adjacent straight portions 23 and the curved portion 24 located therebetween form a herringbone corrugated pattern, and the curved portion 24 forms a corner of the herringbone corrugated pattern.

[0025] Among them, for at least one of the multiple plates 100, for each of the first plate 101 and the second plate 102, or one of the multiple first plates 101, or one of the multiple second plates 102, among the multiple curved portions 24 of the multiple corrugated structures 2, at least one curved portion 24 is provided with a connecting portion 241, at least part of the connecting portion 241 passes through the curved portion 24 in the arrangement direction of the corrugated structure 2, the connecting portion 241 connects two adjacent trough portions 22 separated by the corrugated structure 2, and the plate 100 is formed with a flow channel 25 for fluid to pass through the peak portion 21 located between the two adjacent trough portions 22 through the connecting portion 241.

[0026] The connecting portion 241 penetrates the curved portion 24 along the direction of the approximate angular bisector of the angle between two adjacent straight portions 23. The connecting portion 241 is a groove sunken from the crest portion 21, and the corresponding depth of the groove is less than or equal to the depth of any one of the two adjacent trough portions 22. Figure 2 The structural diagram of the first plate 101 and Figure 3 An enlarged view of the structure of a portion of the main heat exchange area of ​​the first plate 101 is shown.

[0027] In order to improve the heat exchange performance of the plate heat exchanger, at least a portion of the corrugated structures 2 of the multiple corrugated structures 2 extends to the edge of the plate, such as the intersection of the first planar portion 31 and the plate flange, so that the heat exchange area formed between two adjacent plates is larger and the fluid can flow at the edge of the plate, which is beneficial to improving the uniformity of the fluid flow on the plate.

[0028] In an embodiment of the present application, a plate heat exchanger is provided, wherein the plurality of plates 100 include a plurality of first plates 101 and a plurality of second plates 102, the first plates 101 and the second plates 102 are arranged alternately, and each plate 100 includes a front side 1001 and a back side 1002 opposite to each other. Figure 5 Schematic diagram of the stacked structure of the first plate 101 and the second plate 102.

[0029] In order to reduce costs, the first plate 101 and the second plate 102 are plates 100 of the same shape and structure. When stacked, the first plate 101 is rotated 180° relative to the second plate 102 for stacking. Of course, the shapes and structures of the first plate 101 and the second plate 102 may also be different. The present application does not impose any restrictions on this, as long as the two can be assembled to achieve the same circulation effect.

[0030] In one embodiment, the depths of two adjacent troughs 22 are approximately equal, and the plate 100 also includes a first matching area 3 located on both sides of the main heat exchange area 1 in the length direction, and the first matching area 3 includes a first planar portion 31, and the first planar portion 31 is connected to the trough 22 at the edge of the main heat exchange area 1, and the trough 22 is flush with the first planar portion 31, and the peak portion 21 protrudes toward one side of the plate 100 relative to the first planar portion 31, and the peak portion 21 and the trough portion 22 are both provided with a plane or a micro-curved surface for welding with adjacent plates 100.

[0031] For ease of understanding, the first plate 101 is used for illustration. In the first matching area 3 of the first plate 101, two planar corner holes are formed at the two corners of the first plane portion 31, and boss corner holes protruding from the plate surface by a certain height are respectively formed at the other two corners of the first plane portion 31. The direction in which the boss corner hole protrudes from the first plane portion 31 is opposite to the direction in which the flange protrudes from the first plane portion 31. Here, one side of the first plate 101 with the boss corner hole is defined as the front side 1001, and the other side is the back side 1002.

[0032] The corrugated structure 2 is convex on the front side 1001 of each plate 100 relative to the first plane portion 31, and a peak portion 21 is formed on the top of the corrugated structure 2. Accordingly, the corrugated structure 2 forms a groove portion on the back side 1002 of each plate relative to the first plane portion 31, and the portion located between two adjacent corrugated structures 2 forms a trough portion 22. The front side 1001 of the first plate 101 is opposite to the back side 1002 of the second plate 102, and the back side 1002 of the first plate 101 is opposite to the front side 1001 of the second plate 102. The herringbone corrugated patterns at corresponding positions of the first plate 101 and the second plate 102 are set in reverse, and the peak portion 21 of each plate contacts the trough portion 22 of the adjacent plate to form a welding point.

[0033] The corrugated structures 2 are arranged at a certain distance from each other on the plate, and the spacing between the corrugated structures 2 can be equal or unequal. Figure 4 The schematic cross-sectional view of the plate shows that the troughs 22 are formed between adjacent corrugated structures 2 and the top portions of the corrugated structures 2 form the peaks 21 .

[0034] Due to the existence of the connecting portion 241, at the corner position near the herringbone waveform pattern, when the fluid flows from a trough 22 on the front side 1001 of the plate 100 to another adjacent trough 22, it is not necessary to completely turn over the peak portion between the two adjacent troughs 22, and can directly reach the other trough 22 through the flow channel 25 formed by the connecting portion 241, which is equivalent to opening up a "shortcut" to the next trough 22 in the original flow dead zone. The flow pressure drop of the flow channel 25 formed by the connecting portion 241 is relatively low, which is conducive to breaking the limitation of the original flow dead zone, so that the fluid improves the fluidity at the sharp corner position of the herringbone waveform pattern, which is beneficial to the distribution of the fluid on the plate surface.

[0035] Furthermore, in order to prevent the fluid from flowing out in a straight line through the connecting portion 241 at the sharp corner of the herringbone waveform pattern toward the outlet on the other side of the plate, as shown in FIG. Figure 6 The enlarged view of the partial structure of the first plate shown in the figure shows that the plurality of corrugated structures 2 include a plurality of first corrugated structures 251 and a plurality of second corrugated structures 252. The connecting portion 241 is provided at the curved portion 24 of the first corrugated structure 251, and the curved portion 24 of the second corrugated structure 252 is not provided with the connecting portion 241. The first corrugated structure 251 and the second corrugated structure 252 are alternately arranged in the main heat exchange area 1 of the plate. Thus, the curved portion 24 provided with the connecting portion 241 and the curved portion 24 not provided with the connecting portion 241 are alternately arranged. This is conducive to the fluid flowing on the plate in a relatively tortuous flow manner, which can be referred to Figure 6 The black line with an arrow in the middle indicates the direction of fluid flow. It can effectively improve the heat transfer coefficient of the fluid, thereby helping to improve the heat transfer performance of the plate heat exchanger.

[0036] In another embodiment of the present application, a plate heat exchanger with an asymmetric corrugated structure is provided. For the asymmetric corrugated structure, refer to Figure 7 The structural diagram of the first plate 101 is shown as follows: Figure 8 The schematic diagram of the partial structure of the first plate 101 is shown in an enlarged view, wherein the plurality of troughs 22 include a plurality of first troughs 221 and a plurality of second troughs 222. The first troughs 221 and the second troughs 222 are arranged alternately, the depth of the first troughs 221 is greater than the depth of the second troughs 222, and the peaks 21 and the first troughs 221 are both provided with a plane or a slightly curved surface for welding with adjacent plates.

[0037] Correspondingly, the depth of the groove corresponding to the connecting portion 241 is substantially equal to the depth of the second wave valley portion 222 , and the depth of the groove accounts for 15%-75% of the depth of the first wave valley portion 221 .

[0038] refer to Figures 7 to 14 In an embodiment of the present application, a plate heat exchanger is provided, which includes a plurality of first plates 101 and second plates 102 matched with the first plates 101, the first plates 101 and the second plates 102 are alternately arranged, and the first plates 101 and the second plates 102 each include a relative front side 1001 and a reverse side 1002, and during assembly, the front side 1001 of the first plate 101 is opposite to the reverse side 1002 of the second plate 102, and the reverse side 1002 of the first plate 101 is opposite to the front side 1001 of the second plate 102.

[0039] The first plate 101 includes a second matching area 4 located on both sides of the main heat exchange area 1 in the length direction, and the second matching area 4 includes a second plane portion 41, and the second plane portion 41 is connected to the first trough portion 221 at the edge of the main heat exchange area 1 of the first plate 101, and the first trough portion 221 at the edge of the main heat exchange area 1 of the first plate 101 is flush with the second plane portion 41, along the thickness direction of the first plate 101, the peak portion 21 is higher than the second plane portion 41 on the front side 1001 of the first plate 101, and the second trough portion 222 is higher than the second plane portion 41 on the front side 1001 of the first plate 101. Reference Fig. 9 On the first plate 101 , the first trough 221 is flush with the second planar portion 41 , and the second trough 222 is higher than the second planar portion 41 on the front side 1001 of the third plate. The first trough 221 and the second trough 222 form an M-shaped structure relative to the second planar portion 41 .

[0040] The second plate 102 has a similar structure to the main heat exchange zone of the first plate 101. The multiple troughs 22 of the second plate 102 also include multiple first troughs 221 and multiple second troughs 222. The first troughs 221 and the second troughs 222 are alternately arranged. The depth of the first troughs 221 is greater than the depth of the second troughs 222. The peaks 21 and the first troughs 221 are both provided with planes or micro-curved surfaces for welding with adjacent plates. The second plate 102 includes a third matching area 5 located on both sides of the main heat exchange zone 1 in the length direction. The third matching area 5 includes a third plane portion 51. The third plane portion 51 is connected to the peaks 21 at the edge of the main heat exchange zone 1 of the second plate 102. The peaks 21 at the edge of the main heat exchange zone 1 of the second plate 102 are flush with the third plane portion 51. The first troughs 221 and the second troughs 222 are raised relative to the third plane portion 51 on the front side 1001 of the second plate 102. Reference Fig.12On the second plate 102, the crest portion 21 is flush with the third plane portion 51, the first trough portion 221 and the second trough portion 222 protrude relative to the third plane portion 51 on the front side 1001 of the second plate 102, the first trough portion 221 and the second trough portion 222 are both higher than the front side 1001 of the second plate 102, and the first trough portion 221 and the second trough portion 222 form a W-shaped structure relative to the third plane portion 51.

[0041] The crest portion 21 and the first trough portion 221 of each plate 100 are provided with a plane or a slightly curved surface for welding with adjacent plates 100, the crest portion 21 of the front side 1001 of the first plate 101 contacts the crest portion 21 of the back side 1002 of the adjacent second plate 102 to form a welding point, and the first trough portion 221 of the back side 1002 of the first plate 101 contacts the first trough portion 221 of the front side 1001 of the adjacent second plate 102 to form a welding point.

[0042] The depth of the connecting portion 241 and the second wave valley portion 222 is roughly the same, which can be referred to Fig.14 The schematic diagram of the stacking of the first plate 101 and the second plate 102 is shown, with the fluid flowing on the front side 1001 of the first plate 101. Due to the existence of the connecting portion 241, when the fluid flows from the first trough portion 221 on the front side 1001 of the first plate 101 to the adjacent second trough portion 222, it is not necessary to completely turn over the crest portion 21 between the first trough portion 221 and the second trough portion 222, and can directly reach the second trough portion 222 through the flow channel 25 formed by the connecting portion 241, which is equivalent to opening up a "shortcut" to the second trough portion 222 in the original flow dead zone. The flow pressure drop of the flow channel 25 formed by the connecting portion 241 is relatively low, which is conducive to breaking the limitation of the original flow dead zone, so that the fluid improves the fluidity at the sharp corner position of the herringbone waveform pattern, which is conducive to the distribution of the fluid on the plate surface.

[0043] Similarly, in order to prevent the fluid from flowing in a straight line through the connecting portion 241 at the sharp corner of the herringbone waveform pattern toward the outlet on the other side of the plate, as shown in FIG. Fig.13As shown, in the main heat exchange area 1 of each plate, the plurality of corrugated structures 2 include a plurality of third corrugated structures 261 and a plurality of fourth corrugated structures 262, wherein the third corrugated structures 261 and the fourth corrugated structures 262 are alternately arranged in the main heat exchange area 1 of the plate 100. A third corrugated structure 261 and an adjacent fourth corrugated structure 262 form a corrugated unit 26, and a second trough 222 is formed between the first corrugated structure 261 and the second corrugated structure 262 of each corrugated unit 26, and a first trough 221 is formed between two adjacent corrugated units 26. In the corrugated unit 26, the connecting portion 241 is provided in the curved portion 24 on the farther side in the direction in which the sharp corners of the herringbone corrugated pattern are pointed. Fig.13 The curved portion 24 on the farther side is the curved portion 24 on the upper side of the corrugated unit 26. The third corrugated structure 261 and the fourth corrugated structure 262 are alternately arranged in the main heat exchange area 1 of the plate 100, so that the curved portion 24 with the connecting portion 241 and the curved portion 24 without the connecting portion 241 are alternately arranged. This is conducive to the fluid flowing on the plate in a relatively tortuous flow manner, which can be referred to Fig.13 The black line with an arrow in the middle indicates the direction of fluid flow. It can effectively improve the heat transfer coefficient of the fluid, thereby helping to improve the heat transfer performance of the plate heat exchanger.

[0044] The plate structure with a curved portion 24 and a connecting portion 241 provided in the present application can be applied to the circulation channel on the refrigerant side, such as on the front side 1001 of the first plate 101 and / or the back side 1002 of the second plate 102, so as to optimize the channel structure on the refrigerant side and facilitate the uniformity of the distribution of the refrigerant fluid on the plate. Of course, this plate structure can also be applied to the circulation channel structure on the coolant side, and the present application does not impose any restrictions on this.

[0045] Furthermore, in the above-mentioned schematic diagrams provided in the present application, in the width direction of the plate 100, the number of the curved portions 24 of each corrugated structure 2 is greater than or equal to 2. That is, in the width direction of the plate 100, the corrugated structure 2 forms a structure with multiple herringbone corrugated patterns. Of course, the plate 100 of the plate heat exchanger provided in the present application is suitable for a single herringbone wave corrugated structure having one curved portion 24 and two straight portions 23, or a V-shaped corrugated structure; it is also suitable for a multiple herringbone wave corrugated structure having more curved portions 24 and more straight portions 23, such as a W-shaped or double herringbone wave corrugated structure having 3 curved portions 24 and 4 straight portions 23. In particular, for multiple herringbone waves, since the wave tip angle of the herringbone wave structure occupies a certain proportion in the width direction of the plate, the present application is of great help in improving the performance of such products.

[0046] This application can effectively improve the uniformity of fluid flow on the plate and significantly reduce fluid flow resistance, thereby effectively improving product performance.

[0047] The plate heat exchanger provided in the present application is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A plate heat exchanger, comprising a plurality of plates (100), the plurality of plates (100) comprising a plurality of first plates (101) and a plurality of second plates (102), the plurality of first plates (101) and the plurality of second plates (102) being arranged alternately, each plate (100) comprising a front side (1001) and a back side (1002) opposite to each other, the front side (1001) of the first plate (101) being opposite to the back side (1002) of the second plate (102), and the back side (1002) of the first plate (101) being opposite to the front side (1001) of the second plate (102); each of the plates (100) being provided with a main heat exchange area (1), in which the plate (100) is provided with a plurality of corrugations arranged at intervals along the length direction of the plate (100). Structure (2), wherein the plurality of corrugated structures (2) form a plurality of crests (21) and a plurality of troughs (22) along the length direction of the plate (100), the plurality of crests (21) and the plurality of troughs (22) being arranged alternately, two adjacent troughs (22) having the same or different depths, the depth of the trough (22) being calculated based on the crests (21); the corrugated structure (2) comprising at least two straight portions (23) and a curved portion (24); the curved portion (24) being connected between two adjacent straight portions (23), the extension directions of the two adjacent straight portions (23) intersecting, so that the two adjacent straight portions (23) and the curved portion (24) located therebetween form a herringbone corrugated pattern, the curved portion (24) forming a corner of the herringbone corrugated pattern; in, For at least one of the plurality of plates (100), at least one of the plurality of curved portions (24) of the plurality of corrugated structures (2) is provided with a connecting portion (241), wherein the connecting portion (241) at least partially penetrates the curved portion (24) in the length direction of the plate, and the connecting portion (241) connects two adjacent trough portions (22) separated by the corrugated structure (2), and the plate (100) is formed with a flow channel (25) through the connecting portion (241) for fluid to pass through the crest portion (21) located between the two adjacent trough portions (22).

2. The plate heat exchanger according to claim 1, characterized in that: The connecting portion (241) passes through the curved portion (24) in the direction of the approximate bisector of the angle between the extension directions of the two adjacent straight portions (23); the connecting portion (241) is a groove sunken from the crest portion (21); the corresponding depth of the groove is less than or equal to the depth of any one of the two adjacent trough portions (22).

3. The plate heat exchanger according to claim 1 or 2, characterized in that: For each plate (100), the depths of two adjacent troughs (22) are substantially equal. Each plate (100) further comprises a first matching area (3) located on both sides of the main heat exchange area (1) in the length direction. The first matching area (3) comprises a first plane portion (31). The first plane portion (31) is connected to the trough (22) at the edge of the main heat exchange area (1), and the trough (22) is flush with the first plane portion (31). The corrugated structure (2) is raised on the front side (1001) of each plate (100) relative to the first plane portion (31), and the top of the corrugated structure (2) forms a crest portion (21); the corrugated structure (2) forms a groove on the back side (1002) of each plate (100) relative to the first plane portion (31); and the portion located between two adjacent corrugated structures (2) forms a trough portion (22).

4. The plate heat exchanger according to claim 3, characterized in that: The wave crest portion (21) is provided with a plane or a slightly curved surface for welding with an adjacent plate (100), and the wave trough portion (22) is provided with a plane or a slightly curved surface for welding with an adjacent plate (100); The herringbone corrugated patterns at corresponding positions of the first plate (101) and the second plate (102) are arranged in reverse, and the crest portion (21) of each plate (100) contacts the trough portion (22) of an adjacent plate (100) to form a welding point.

5. The plate heat exchanger according to claim 4, characterized in that: The plurality of corrugated structures (2) include a plurality of first corrugated structures (251) and a plurality of second corrugated structures (252); the connecting portion (241) is provided at a bent portion (24) of the first corrugated structure (251); the bent portion (24) of the second corrugated structure (252) is not provided with a connecting portion (241); and the first corrugated structures (251) and the second corrugated structures (252) are alternately provided in a main heat exchange region (1) of the plate (100).

6. The plate heat exchanger according to claim 2, characterized in that: The plurality of trough portions (22) include a plurality of first trough portions (221) and a plurality of second trough portions (222); the depth of the first trough portions (221) is greater than the depth of the second trough portions (222); the first trough portions (221) and the second trough portions (222) are arranged alternately; the crest portion (21) is provided with a plane or a micro-curved surface for welding with an adjacent plate; and the first trough portion (221) is provided with a plane or a micro-curved surface for welding with an adjacent plate.

7. The plate heat exchanger according to claim 6, characterized in that: The depth of the groove is substantially equal to the depth of the second wave valley portion (222), and the depth of the groove accounts for 15%-75% of the depth of the first wave valley portion (221).

8. The plate heat exchanger according to claim 6 or 7, characterized in that: The first plate (101) comprises a second matching area (4) located on both sides of the main heat exchange area (1) in the length direction, the second matching area (4) comprises a second plane portion (41), the second plane portion (41) is connected to a first wave valley portion (221) at the edge of the main heat exchange area (1) of the first plate (101), and the first wave valley portion (221) of the main heat exchange area (1) of the first plate (101) is flush with the second plane portion (41); along the thickness direction of the first plate (101), the wave crest portion (21) and the second wave valley portion (222) are both higher than the second plane portion (41) on the front side (1001) of the first plate (101); The second plate (102) comprises a third matching area (5) located on both sides of the main heat exchange area (1) in the length direction, the third matching area (5) comprises a third plane portion (51), the third plane portion (51) is connected to the crest portion (21) at the edge of the main heat exchange area (1) of the second plate (102), and the crest portion (21) of the second plate (102) is flush with the third plane portion (51); the first trough portion (221) and the second trough portion (222) are protruding relative to the third plane portion (51) on the front side (1001) of the second plate (102); The crest portion (21) of each plate is provided with a plane or a micro-curved surface for welding with an adjacent plate, and the first trough portion (221) of each plate is provided with a plane or a micro-curved surface for welding with an adjacent plate; wherein the crest portion (21) of the front side (1001) of the first plate (101) contacts the crest portion (21) of the back side (1002) of the adjacent second plate (102) to form a welding spot, and the first trough portion (221) of the back side (1002) of the first plate (101) contacts the first trough portion (221) of the front side (1001) of the adjacent second plate (102) to form a welding spot.

9. The plate heat exchanger according to claim 8, characterized in that: The plurality of corrugated structures (2) include a plurality of third corrugated structures (261) and a plurality of fourth corrugated structures (262), wherein the third corrugated structures (261) and the fourth corrugated structures (262) are alternately arranged in the main heat exchange area (1) of the plate; a third corrugated structure (261) and a fourth corrugated structure (262) form a corrugated unit, the second wave valley (222) is formed between the third corrugated structure (261) and the fourth corrugated structure (262) of each corrugated unit (26), and the first wave valley (221) is formed between two adjacent corrugated units (26); in the corrugated unit (26), the connecting portion (241) is arranged at the curved portion (24) on the far side in the direction in which the sharp corners of the herringbone corrugated pattern point in the third corrugated structure (261) and the fourth corrugated structure (262).

10. The plate heat exchanger according to claim 1, characterized in that: In the width direction of the plate (100), the number of the bent portions (24) of at least part of the corrugated structure (2) is greater than or equal to 2, and the at least part of the corrugated structure (2) forms a multiple herringbone corrugated pattern in the width direction of the plate (100).

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