Plate heat exchanger

Abstract

The plate heat exchanger comprises a first plate sheet and a second plate sheet which are adjacent to each other, the first plate sheet and the second plate sheet are provided with corresponding conducting holes, the peripheries of the conducting holes are provided with connecting surfaces, the connecting surface of the first plate sheet comprises a circumferential first connecting plane and a circumferential first connecting curved surface, and the connecting surface of the second plate sheet comprises a circumferential second connecting plane and a circumferential second connecting curved surface. The connecting surface of the second plate sheet comprises a circumferential second connecting plane and a circumferential second connecting curved surface; a first boss is arranged at the corner position of the first plate sheet and / or a second boss is arranged at the corner position of the second plate sheet; the first connecting plane and the first connecting curved surface are located on at least one part of the top wall of the first boss, and / or the second connecting plane and the second connecting curved surface are located on at least one part of the top wall of the second boss. According to the heat exchanger, the possibility of matching failure caused by position deviation of the plates is smaller, meanwhile, the connecting area is increased, connection is firmer, and the heat exchanger has a turbulent flow effect on fluid.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and particularly to a plate heat exchanger with multiple layers of plates. Background Art

[0002] A plate heat exchanger is mainly composed of multiple plates. Structurally, it has corner hole channels and inter-plate channels. At least one of the adjacent plates is designed with a boss at the corner position, and the boss is welded to the boss of the adjacent another plate to achieve the sealing of the inter-plate channels on both sides of the same plate; by designing a corner hole on the boss, the conduction between the corner hole channel and the inter-plate channel of the same fluid (hot fluid or cold fluid) can be achieved.

[0003] In at least some of the adjacent plates, the bosses corresponding to the corresponding corner holes are welded in a planar manner. To improve the heat exchange efficiency and increase the heat exchange area, the welding area of the corner hole bosses is generally small. During the actual installation process, due to the positional deviation between the adjacent plates, there is a possibility of cooperation failure. Moreover, when the fluid flows through the corner hole channel, the fluid impacts the plane of the boss, and the boss has a small disturbing effect on the fluid, which is not conducive to the mixing of gas-liquid two-phase fluids in the corner hole channel. Summary of the Invention

[0004] The purpose of the present invention is to provide a plate heat exchanger to solve the above technical problems.

[0005] To achieve the above purpose, the present invention provides a plate heat exchanger, including adjacent first and second plates. The first and second plates are provided with corresponding guiding through holes, and a connecting surface is provided around the guiding through holes. The connecting surface of the first plate includes a circumferential first connecting plane and a circumferential first connecting curved surface, and the connecting surface of the second plate includes a circumferential second connecting plane and a circumferential second connecting curved surface. The first plate is provided with a first boss at the corner position and / or the second plate is provided with a second boss at the corner position; the first connecting plane and the first connecting curved surface are located on at least a part of the top wall of the first boss, and / or, the second connecting plane and the second connecting curved surface are located on at least a part of the top wall of the second boss; the first connecting plane is matched and connected with the second connecting plane, and the first connecting curved surface is matched and connected with the second connecting curved surface.

[0006] Optionally, in the radial direction of the first boss, the first connecting curved surface is located inside the first connecting plane; in the radial direction of the second boss, the second connecting curved surface is located inside the second connecting plane.

[0007] Optionally, in the radial direction of the first boss, the first connecting surface is located between the two first connecting planes; in the radial direction of the second boss, the second connecting surface is located between the two second connecting planes.

[0008] Optionally, the first connecting surface and the second connecting surface are respectively circumferentially wavy.

[0009] Optionally, the crests and troughs of the first connecting surface and the second connecting surface are uniform; alternatively, the first connecting surface and the second connecting surface have large crests and large troughs, and there is at least one small crest between the large crests, and at least one small trough between the large troughs.

[0010] Optionally, the first connecting surface and the second connecting surface are respectively arc-shaped and bend towards the same side of the first plate and the second plate.

[0011] Optionally, the first connecting surface and the second connecting surface bend towards the inlet end of the angled hole channel.

[0012] Optionally, the radial widths of the first connecting plane and the second connecting plane are 0.5 mm - 1.5 mm, and / or the radial widths of the first connecting surface and the second connecting surface are 0.5 mm - 1.5 mm.

[0013] Optionally, nested positioning parts extending along the length direction are provided in the middle parts of the first plate and the second plate. The nested positioning parts are hollow structures with openings facing downwards. The middle parts thereof are of equal width, and the two ends of the nested positioning parts gradually narrow towards the equal-width part; one end of the nested positioning part is provided with an intermediate partition extending to the end wall of the plate. The intermediate partition is a hollow structure with an opening facing downwards, and its height is lower than that of the nested positioning part.

[0014] Optionally, the first plate and the second plate have the same structure, and the second plate rotates 180 degrees circumferentially relative to the first plate.

[0015] In the plate heat exchanger provided by the present invention, at least one of two adjacent plates is provided with a boss. At least a part of the top wall of the boss forms a circumferential connecting plane and a circumferential connecting surface. Among them, the connecting plane is easier to fit during connection, and the formed connecting surface after connection is more uniform, which can better achieve sealing. The connecting surface makes the possibility of fitting failure due to position deviation smaller during the actual installation process of adjacent plates. At the same time, the connecting area is increased, the connection is more firm, and it can withstand higher fluid pressure; moreover, when the fluid flows through the angled hole channel, the fluid impacts the curved surface part of the boss, which has a disturbing effect on the fluid and is beneficial to the mixing of gas-liquid two-phase fluids in the angled hole channel. Description of the Drawings

[0016] Figure 1 The top view of a plate heat exchanger provided by an embodiment of the present invention;

[0017] Figure 2 is Figure 1 the A-A view of the plate heat exchanger shown;

[0018] Figure 3 is Figure 1 the B-B view of the plate heat exchanger shown;

[0019] Figure 4 is Figure 2 the enlarged partial view of part I in

[0020] Figure 5 is Figure 1 the exploded structural schematic diagram of the plate heat exchanger shown;

[0021] Figure 6 is Figure 1 the exploded structural schematic diagram of the plate heat exchanger shown from another perspective;

[0022] Figure 7 the top view of a single plate;

[0023] Figure 8 is Figure 7 the C-C view of the single plate shown;

[0024] Figure 9 is Figure 7 the D-D view of the single plate shown;

[0025] Figure 10 is Figure 7 the axonometric view of the single plate shown;

[0026] Figure 11 is Figure 7 the axonometric view of the single plate shown from another perspective;

[0027] Figure 12 the sectional structural schematic diagram of three layers of plates welded together;

[0028] Figure 13 the axonometric view of a plate heat exchanger provided by an embodiment of the present invention;

[0029] Figure 14 is Figure 13 the exploded structural schematic diagram of the plate heat exchanger shown;

[0030] Figure 15 is Figure 13 the exploded structural schematic diagram of the plate heat exchanger shown from another perspective;

[0031] Figure 16is Figure 13 the top view of the plate heat exchanger shown;

[0032] Figure 17 is Figure 16 the E-E view of the plate heat exchanger shown;

[0033] Figure 18 is Figure 16 the F-F view of the plate heat exchanger shown;

[0034] Figure 19 is Figure 17 the partial enlarged view of part II in

[0035] Figure 20 the top view of a single plate;

[0036] Figure 21 is Figure 20 the G-G view of the single plate shown;

[0037] Figure 22 is Figure 20 the H-H view of the single plate shown;

[0038] Figure 23 is Figure 20 the axonometric view of the single plate shown.

[0039] In the figure:

[0040] 10. Plate heat exchanger 11. Plate 12. Frame 13. Boss 14. Guide through hole 111. First plate 112. Second plate 131. First boss 132. Second boss 141. First guide through hole 142. Second guide through hole 151. First connection plane 152. Second connection plane 161. First connection surface 162. Second connection surface 117. Nesting positioning part 118. Intermediate partition

[0041] 20. Plate heat exchanger 21. Plate 22. Frame 23. Boss 24. Guide through hole 211. First plate 212. Second plate 231. First boss 232. Second boss 241. First guide through hole 242. Second guide through hole 251. First connection plane 252. Second connection plane 261. First connection surface 262. Second connection surface 217. Nesting positioning part 218. Intermediate partition. Detailed implementation manners

[0042] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0043] In this text, terms such as "upper, lower, inner, outer" are established based on the positional relationships shown in the drawings. Depending on the different drawings, the corresponding positional relationships may also change accordingly. Therefore, they should not be understood as absolute limitations on the protection scope. Moreover, relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0044] Please refer to Figures 1 to 6 , Figure 1 is a top view of a plate heat exchanger provided by an embodiment of the present invention; Figure 2 is Figure 1 the A-A view of the plate heat exchanger shown; Figure 3 is Figure 1 the B-B view of the plate heat exchanger shown; Figure 4 is Figure 2 a partial enlarged view of the I part in Figure 5 is Figure 1 a schematic exploded view of the plate heat exchanger shown; Figure 6 is Figure 1 a schematic exploded view of the plate heat exchanger from another perspective shown.

[0045] As shown in the figure, in a specific embodiment, the main body part of the plate heat exchanger 10 provided by the present invention is formed by stacking and welding multiple layers of plate sheets 11 layer by layer (shown as six layers in the figure). Heat fluid inter-plate channels and cold fluid plate channels are formed in an alternating manner between the plate sheets 11. Each layer of plate sheet 11 is generally in the shape of a rectangle with rounded corners, and it has a circumferentially closed frame 12 around its perimeter. The frame 12 has an outwardly inclined angle relative to the plate surface, and the frames 12 can partially overlap and be welded together.

[0046] Each layer of plate sheet 11 is respectively provided with four bosses 13 at its four corners. Two bosses 13 at one end in the length direction protrude upward, and the two bosses 13 at the other end protrude downward. For two adjacent layers of plate sheets 11, the protruding directions of their corresponding bosses 13 are opposite. Through holes 14 are respectively machined on the bosses 13 to realize the conduction of the angular hole channels and the inter-plate channels of the same fluid.

[0047] Since the welding structures of the bosses 13 at the four corners are similar, only one of the bosses 13 of two certain layers of plate sheets 11 is selected as an example to illustrate its structure below.

[0048] Among the selected two-layer plates 11, one is the first plate 111 and the other is the second plate 112. The first plate 111 and the second plate 112 are provided with relatively protruding first bosses 131 and second bosses 132 at the corner positions. The first bosses 131 and the second bosses 132 are provided with first through holes 141 and second through holes 142 that form a corner hole channel.

[0049] At least a part of the top wall of the first boss 131 forms a first welding surface located around the first through hole 141. At least a part of the top wall of the second boss 131 forms a second welding surface located around the second through hole 142. The first welding surface has a circumferential first connection plane 151 and a first connection curved surface 161. The first connection curved surface 161 is located inside the first connection plane 151 in the radial direction. The second welding surface has a circumferential second connection plane 152 and a second connection curved surface 162. The second connection curved surface 162 is located inside the second connection plane 152 in the radial direction. The first connection plane 151 and the second connection plane 152 are attached and welded together. The first connection curved surface 161 and the second connection curved surface 162 are mated and welded together (solder is omitted in the figure).

[0050] Of course, in addition to being connected by welding, the first connection plane 151 and the second connection plane 152, and the first connection curved surface 161 and the second connection curved surface 162 can also be connected by other means such as bonding.

[0051] Please also refer to Figures 7 to 12 , Figure 7 is the top view of a single plate; Figure 8 is Figure 7 the C-C view of the single plate shown; Figure 9 is Figure 7 the D-D view of the single plate shown; Figure 10 is Figure 7 the isometric view of the single plate shown; Figure 11 is Figure 7 the isometric view of the single plate from another perspective shown; Figure 12 is the cross-sectional structure schematic diagram of three-layer plates welded together.

[0052] As shown in the figure, the first plate 111 and the second plate 112 can be formed by stamping a plate, and the wall thickness is basically uniform.

[0053] The first connecting surface 161 and the second connecting surface 162 are respectively circumferentially wavy. The wave crests and wave troughs of the first connecting surface 161 and the second connecting surface 162 in the shape of sine waves are uniform. The radial widths of the first connecting plane 151 and the second connecting plane 152 are 0.5 mm - 1.5 mm, such as 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm or 1.4 mm, etc. The radial widths of the first connecting surface 161 and the second connecting surface 162 are 0.5 mm - 1.5 mm, such as 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, etc.

[0054] In the middle of the first plate 111 and the second plate 112, there is a nested positioning portion 117 extending along the length direction. Since it is formed by stamping, one side of the nested positioning portion 117 is a convex rib and the other side is a groove, showing a hollow structure with an opening downward in the figure. The middle part is of equal width, and the two ends of the nested positioning portion 117 gradually narrow towards the equal-width part. One end of the nested positioning portion 117 is provided with an intermediate partition 118 extending to the end wall of the plate. The intermediate partition 118 is also a hollow structure with an opening downward, and its height is lower than that of the nested positioning portion 117.

[0055] The first plate 111 and the second plate 112 have the same structure, and the second plate 112 rotates circumferentially by 180 degrees relative to the first plate 111. In this way, when the first plate 111 and the second plate 112 overlap, the nested positioning portions 117 of the two are nested together, and the intermediate partition 118 can be in sealed contact with the bottom surface of the upper plate, dividing the inter-plate channel into two parts from the middle together with the nested positioning portion 117, so that each layer of the inter-plate channel forms a U-shaped flow channel, increasing the travel of the fluid flowing through the inter-plate channel and improving the heat exchange efficiency.

[0056] Moreover, with such a structure, the same plate 11 can be used to manufacture the heat exchanger. During assembly, only the orientation needs to be adjusted, and there is no need to design two plates 11 with different structures, which can simplify the process, reduce costs and assembly difficulties.

[0057] Of course, in other embodiments, the wave crests and wave troughs of the first connecting surface 161 and the second connecting surface 162 can also be non-uniform, that is, the first connecting surface 161 and the second connecting surface 162 have large wave crests and large wave troughs, and there is at least one small wave crest between every two large wave crests, and there is at least one small wave trough between every two large wave troughs.

[0058] If the structure of all large wave peaks and large wave valleys is adopted, although the effect of eliminating errors and turbulence is relatively obvious, there is a problem of large processing difficulty. If the structure of all small wave peaks and small wave valleys is adopted, although it is easy to process, the effect of eliminating errors and turbulence will be weakened. The structure of using large wave peaks and small wave peaks, large wave valleys and small wave valleys in combination can achieve a better balance between the above contradictions, so as to take into account the effects of both aspects (note: the large and small in this article are relative concepts, so they do not belong to ambiguous terms).

[0059] Please continue to refer to Figures 13 to 19 , Figure 13 which is an axonometric view of a plate heat exchanger provided by an embodiment of the present invention; Figure 14 is Figure 13 a schematic exploded view of the plate heat exchanger shown; Figure 15 is Figure 13 a schematic exploded view of the plate heat exchanger shown from another perspective; Figure 16 is Figure 13 a top view of the plate heat exchanger shown; Figure 17 is Figure 16 an E-E view of the plate heat exchanger shown; Figure 18 is Figure 16 an F-F view of the plate heat exchanger shown; Figure 19 is Figure 17 a partial enlarged view of the II part in

[0060] As shown in the figure, in another specific embodiment, the main body part of the plate heat exchanger 20 provided by the present invention is also formed by stacking and welding multiple layers of plate sheets 21 layer by layer (shown as six layers in the figure). Heat fluid inter-plate channels and cold fluid plate channels are formed alternately in multiple layers between the plate sheets 21. Each layer of plate sheet 21 is generally a rectangle with rounded corners, and its four sides have axially closed frames 22. The frames 22 have an outwardly inclined angle relative to the plate surface, and the frames 22 can be partially overlapped and welded together.

[0061] Each layer of plate sheet 21 is respectively provided with four bosses 23 at the four corners. Two bosses 23 at one end in the length direction protrude upward, and two bosses 23 at the other end protrude downward. For two adjacent layers of plate sheets 21, the protruding directions of the corresponding bosses 23 are opposite. Guide through holes 24 are respectively processed on the bosses 23 to realize the conduction of the angular hole channels and inter-plate channels of the same fluid.

[0062] Since the welding structures of the bosses 23 at the four corners are similar, only one boss 23 of a certain two layers of plate sheets 21 is selected as an example to illustrate its structure below.

[0063] Among the selected two-layer plates 21, one is the first plate 211 and the other is the second plate 212. The first plate 211 and the second plate 212 are provided with relatively protruding first bosses 231 and second bosses 232 at the corner positions. The first bosses 231 and the second bosses 232 are provided with first guide through holes 241 and second guide through holes 242 that form a corner hole channel.

[0064] At least a part of the top wall of the first boss 231 forms a first welding surface located around the first guide through hole 241. At least a part of the top wall of the second boss 232 forms a second welding surface located around the second guide through hole 242. The first welding surface has a circumferential first connection plane 251 and a first connection curved surface 261. The first connection curved surface 261 is located inside the first connection plane 251 in the radial direction. The second welding surface has a circumferential second connection plane 252 and a second connection curved surface 262. The second connection curved surface 262 is located inside the second connection plane 252 in the radial direction. The first connection plane 251 and the second connection plane 252 are attached and welded together. The first connection curved surface 261 and the second connection curved surface 262 are mated and welded together.

[0065] Please continue to refer to Figures 20 to 23 , Figure 20 is the top view of a single plate; Figure 21 is Figure 20 the G-G view of the single plate shown in Figure 22 is Figure 20 the H-H view of the single plate shown in Figure 23 is Figure 20 the isometric view of the single plate shown in

[0066] As shown in the figure, the first plate 211 and the second plate 212 can be formed by stamping a plate, and the wall thickness is basically uniform.

[0067] The first connection curved surface 261 and the second connection curved surface 262 are respectively arc-shaped and bend in the same direction. The bending directions of the first connection curved surface 261 and the second connection curved surface 262 are opposite to the fluid flow direction of the corner hole channel.

[0068] The radial widths of the first connection plane 251 and the second connection plane 252 are 0.5 mm - 1.5 mm, such as 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, etc. The radial widths of the first connection curved surface 261 and the second connection curved surface 262 are 0.5 mm - 1.5 mm, such as 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm or 1.4 mm, etc.

[0069] In the middle of the first plate 211 and the second plate 212, there is a nested positioning part 217 extending along the length direction. Since it is formed by stamping, one side of the nested positioning part 217 is a convex rib and the other side is a groove, showing a hollow structure with an opening downward in the figure. The middle part is of equal width, and the two ends of the nested positioning part 217 gradually narrow towards the equal-width part. One end of the nested positioning part 217 is provided with an intermediate partition 218 extending to the end wall of the plate. The intermediate partition 218 is also a hollow structure with an opening downward, and its height is lower than that of the nested positioning part 217.

[0070] The first plate 211 and the second plate 212 have the same structure, and the second plate 212 rotates 180 degrees circumferentially relative to the first plate 211. In this way, when the first plate 211 and the second plate 212 overlap, the nested positioning parts 217 of the two are nested together, and the intermediate partition 218 can be in sealed contact with the bottom surface of the upper plate. Together with the nested positioning part 217, the inter-plate channel is divided into two parts from the middle, so that each layer of the inter-plate channel forms a U-shaped flow channel, increasing the travel of the fluid flowing through the inter-plate channel and improving the heat exchange efficiency.

[0071] Moreover, with such a structure, the same plate 21 can be used to manufacture the heat exchanger. During assembly, only the orientation needs to be adjusted, and there is no need to design two plates with different structures, which can simplify the process, reduce costs and assembly difficulties.

[0072] The above embodiments are only the preferred solutions of the present invention, and are not specifically limited thereto. On this basis, targeted adjustments can be made according to actual needs to obtain different implementation manners.

[0073] For example, only one of the first plate 111 and the second plate 112 is provided with a boss. If only the first plate 111 is provided with a boss, then the second plate 112 is not designed with a boss. The first connection plane 151 and the first connection curved surface are located on the first boss 131 of the first plate 111, and the second connection plane 152 and the second connection curved surface 152 are located in the flat area around the second through hole 142 of the second plate 112, and the purpose of the present invention can also be achieved. If such a structure is adopted, then in the case of the same inter-plate distance, the height of the first boss 131 of the first plate 111 needs to be designed relatively large. Since one less boss is processed, the production efficiency is relatively high. In the above first embodiment, bosses are designed on both the first plate 111 and the second plate 112. Therefore, the heights of the first boss 131 and the second boss 132 can be designed relatively small, which helps to reduce the difficulty of processing and manufacturing.

[0074] Alternatively, each boss 13 is provided with two first connection planes 151, and the first connection curved surface 161 is located between the two first connection planes 151 in the radial direction. Correspondingly, each boss 13 is provided with two second connection planes 152, and the second connection curved surface 162 is located between the two second connection planes 152 in the radial direction, and so on.

[0075] Since there are many possible implementation manners, they will not be exemplified one by one here.

[0076] In the plate heat exchanger provided by the present invention, among the two bosses welded to each other, the first boss has a first connection plane and a first connection curved surface, and the second boss has a second connection plane and a second connection curved surface. The first connection plane and the second connection plane are more easily fitted during welding, and the formed welding surface is more uniform after welding, so that better sealing can be achieved.

[0077] Moreover, through the concave-convex fit between the first connection curved surface and the second connection curved surface, the possibility of cooperation failure due to position deviation during the actual installation of adjacent plates is smaller. At the same time, the welding area is increased, the welding is more firm, and higher fluid pressure can be withstood.

[0078] In addition, when the fluid flows through the corner hole channel, the fluid impacts the curved surface part of the boss, which has a flow disturbing effect on the fluid and is beneficial to the mixing of the gas-liquid two-phase fluid in the corner hole channel.

[0079] The above has introduced the plate heat exchanger provided by the present invention in detail. Specific examples are used in this article to elaborate on the principle and implementation manner 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 noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A plate heat exchanger, comprising adjacent first plates (111) and second plates (112), wherein the first plates (111) and the second plates (112) are provided with corresponding guide through holes, and connection surfaces are arranged around the guide through holes, characterized in that, The connecting surface of the first plate (111) includes a circumferential first connecting plane (151) and a circumferential first connecting curved surface (161), the connecting surface of the second plate (112) includes a circumferential second connecting plane (152) and a circumferential second connecting curved surface (162), the first plate (111) is provided with a first boss (131) at a corner position and / or the second plate (112) is provided with a second boss (132) at a corner position; the first connecting plane (151) and the first connecting curved surface (161) are located on at least a part of the top wall of the first boss (131), and / or, the second connecting plane (152) and the second connecting curved surface (162) are located on at least a part of the top wall of the second boss (132); the first connecting plane (151) cooperates with and connects to the second connecting plane (152), and the first connecting curved surface (161) cooperates with and connects to the second connecting curved surface (162).

2. The plate heat exchanger according to claim 1, characterized in that, In the radial direction of the first boss (131), the first connecting curved surface (161) is located inside the first connecting plane (151); in the radial direction of the second boss (132), the second connecting curved surface (162) is located inside the second connecting plane (152).

3. The plate heat exchanger according to claim 1, characterized in that, In the radial direction of the first boss (131), the first connecting curved surface (161) is located between the two first connecting planes (151); in the radial direction of the second boss (132), the second connecting curved surface (162) is located between the two second connecting planes (152).

4. The plate heat exchanger according to claim 2 or 3, characterized in that, The first connecting curved surface (161) and the second connecting curved surface (162) are respectively circumferentially wavy.

5. The plate heat exchanger according to claim 4, wherein, The wave crests and wave troughs of the first connecting curved surface (161) and the second connecting curved surface (162) are uniform; or, the first connecting curved surface (161) and the second connecting curved surface (162) have large wave crests and large wave troughs, and there is at least one small wave crest between the large wave crests, and there is at least one small wave trough between the large wave troughs.

6. The plate heat exchanger according to claim 2 or 3, characterized in that The first connecting curved surface (161) and the second connecting curved surface (162) are respectively arc-shaped and bend to the same side of the first plate (111) and the second plate (112).

7. The plate heat exchanger according to claim 6, characterized in that, The first connecting curved surface (161) and the second connecting curved surface (162) bend towards the inlet end of the corner hole channel.

8. The plate heat exchanger according to claim 1, wherein, The radial width of the first connecting plane (151) and the second connecting plane (152) is 0.5 mm - 1.5 mm, and / or, the radial width of the first connecting curved surface (161) and the second connecting curved surface (162) is 0.5 mm - 1.5 mm.

9. The plate heat exchanger according to claim 1, characterized in that, A nested positioning portion (117) extending in the length direction is provided in the middle of the first plate (111) and the second plate (112). The nested positioning portion (117) is a hollow structure with an opening facing downward, and the middle part thereof is of equal width. Both ends of the nested positioning portion (117) gradually narrow towards the equal-width part; an intermediate partition (118) extending to the end wall of the plate is provided at one end of the nested positioning portion (117). The intermediate partition (118) is a hollow structure with an opening facing downward, and its height is lower than that of the nested positioning portion (117).

10. The plate heat exchanger according to claim 9, characterized in that, The first plate (111) and the second plate (112) have the same structure, and the second plate (112) is circumferentially rotated 180 degrees relative to the first plate (111).

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