Plate heat exchanger

Abstract

This utility model discloses a plate heat exchanger, comprising multiple alternating stacked first plates and second plates. Each first plate includes a first flat plate portion and a first annular protrusion, the first annular protrusion protruding relative to the first flat plate portion. The first annular protrusion includes a first corner hole located at the top of the first annular protrusion, and the top of the first annular protrusion also includes a first corner hole welding surface surrounding the first corner hole. The second plate includes a second flat plate portion, a distribution protrusion, and a distribution hole. The second flat plate portion includes a second corner hole and a second corner hole welding surface, the second corner hole welding surface surrounding the second corner hole. The distribution protrusion protrudes relative to the second corner hole welding surface, the distribution protrusion including a distribution hole and a top surface, the distribution hole located at the top surface of the protrusion. The first corner hole welding surface and the second corner hole welding surface are arranged opposite each other and fixed by welding. The first annular protrusion and the distribution protrusion protrude towards opposite sides. Along the radial direction of the second corner hole, the distribution protrusion is located outside the second corner hole welding surface.

Description

[0001] This application claims priority to Chinese Patent Application No. 202520883614.2, filed on May 7, 2025, entitled “Plate Heat Exchanger”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This utility model relates to the field of refrigeration equipment, and in particular to a plate heat exchanger. Background Technology

[0003] Plate heat exchangers include refrigerant channels, distribution holes, and refrigerant flow spaces that connect to the refrigerant channels via the distribution holes. When distribution holes are located around the corner holes of the refrigerant channels, the pressure around the corner holes is relatively high because the refrigerant only flows through these holes. Therefore, the refrigerant inlet space is small, limiting the placement of distribution holes. When the distribution holes are close to the welding surface of the corner holes, the brazing solder easily flows and accumulates at the distribution hole location due to capillary action, causing blockage. This results in some channels between the plates having no refrigerant flow, reducing the heat exchange performance of the plate heat exchanger. Utility Model Content

[0004] To address the problems in the background art, this utility model discloses a plate heat exchanger, which includes multiple alternatingly stacked first plates and second plates. The first plate includes a first flat plate portion and a first annular protrusion. The first annular protrusion protrudes relative to the first flat plate portion and includes a first corner hole located at the top of the first annular protrusion. The top of the first annular protrusion also includes a first corner hole welding surface surrounding the first corner hole.

[0005] The second plate includes a second flat plate portion, a distribution protrusion and a distribution hole. The second flat plate portion includes a second corner hole and a second corner hole welding surface, with the second corner hole welding surface surrounding the second corner hole. The distribution protrusion protrudes relative to the second corner hole welding surface and includes a distribution hole and a top surface of the protrusion, with the distribution hole located on the top surface of the protrusion.

[0006] The first corner hole welding surface and the second corner hole welding surface are arranged opposite to each other and fixed by welding. The first annular protrusion and the distribution protrusion protrude to opposite sides. Along the radial direction of the second corner hole, the distribution protrusion is located outside the welding surface of the second corner hole.

[0007] Through the above structural design, the distribution hole in this utility model is located on the top surface of the distribution protrusion, and the distribution protrusion is located outside the welding surface of the second corner hole, so that the distribution hole is far away from the welding surface of the second corner hole in the circumferential direction. At the same time, the distribution protrusion protrudes relative to the welding surface of the second corner hole, thereby forming a height difference between the distribution hole and the welding surface of the second corner hole in the thickness direction of the plate, further preventing solder from flowing into the distribution hole and causing blockage.

[0008] On the other hand, this utility model also provides a plate heat exchanger, including multiple alternatingly stacked first plates and second plates. The first plate includes a first flat plate portion, a first annular protrusion, a distribution protrusion, and a distribution hole. The first annular protrusion protrudes relative to the first flat plate portion and includes a first corner hole located at the top of the first annular protrusion. The top of the first annular protrusion also includes a first corner hole welding surface surrounding the first corner hole. The distribution protrusion protrudes relative to the first flat plate portion and includes a top surface of the protrusion, with the distribution hole located at the top surface of the protrusion.

[0009] The second plate includes a second flat plate portion and a second annular protrusion. The second flat plate portion includes a second corner hole and a second corner hole welding surface. The second corner hole welding surface is arranged around the second corner hole. The first corner hole welding surface and the second corner hole welding surface located on one side of the second plate are arranged opposite to each other and fixed by welding. Along the radial direction of the second corner hole, the protrusion is located outside the second corner hole welding surface.

[0010] The top of the second annular protrusion includes an annular welding surface, which is welded and fixed to the first flat plate portion located on the other side of the second plate. The second annular protrusion includes an inner peripheral wall, with the plane where the second flat plate portion is located as the projection plane. The projection of the inner peripheral wall is located outside the projection of the first corner hole and the projection of the distribution protrusion.

[0011] Through the above structural design, the distribution hole in this utility model is located on the top surface of the distribution protrusion, and is located outside the first annular protrusion of the first plate. This makes the distribution hole circumferentially away from the welding surface of the first corner hole, while the distribution protrusion protrudes relative to the welding surface of the first corner hole. This creates a height difference between the distribution hole and the welding surface of the first corner hole in the thickness direction of the plate, further preventing solder from flowing into the distribution hole and causing blockage. Furthermore, by placing the distribution hole outside the first annular protrusion, the deformation area of ​​the first flat plate on the periphery of the first corner hole is small, which is beneficial to improving the structural strength of the plate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the first plate and the second plate in one embodiment of the present invention;

[0013] Figure 2 for Figure 1 A magnified view of a portion of position A in the diagram;

[0014] Figure 3 for Figure 1 A magnified view of a portion of position B in the diagram;

[0015] Figure 4 This is a schematic diagram of the structure of the first plate in the above embodiment;

[0016] Figure 5 This is a schematic diagram of the structure of the second plate in the above embodiment;

[0017] Figure 6 for Figure 5 A magnified view of the area at position C in the middle;

[0018] Figure 7 This is a schematic diagram illustrating the engagement of the first and second plates in the above embodiments;

[0019] Figure 8 This is a cross-sectional schematic diagram of the first plate and the second plate in the above embodiment in the mating state;

[0020] Figure 9 This is a schematic diagram of the structure of the second plate in another embodiment of the present invention;

[0021] Figure 10 This is a schematic diagram of the structure of the first plate in the above embodiment;

[0022] Figure 11 for Figure 10 A magnified view of a portion of position D in the middle;

[0023] Figure 12 This is a schematic diagram illustrating the engagement of the first and second plates in the above embodiments;

[0024] Figure 13 This is a cross-sectional schematic diagram of the first plate and the second plate in the above embodiment in the mating state;

[0025] Figure 14 This is a projected schematic diagram of the first plate and the second plate in this utility model.

[0026] In the picture:

[0027] 1. First plate; 100. First corner hole; 101. First flat plate; 110. First corner hole welding surface; 11. First annular protrusion; 12. First heat exchange corrugation; 13. First reinforcing part;

[0028] 2. Second plate; 200. Second corner hole; 201. Second flat plate; 210. Second corner hole welding surface; 21. Second annular protrusion; 211. Inner peripheral wall; 212. Annular welding surface; 22. Distribution protrusion; 220. Distribution hole; 221. Top surface of protrusion; 23. Second heat exchange corrugation; 24. Second reinforcing part; 30. Interlayer connecting channel; 40. Fluid heat exchange space. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] In one embodiment, such as Figures 1 to 8 As shown, this utility model provides a plate heat exchanger, including multiple alternating stacked first plates 1 and second plates 2. The first plate 1 includes a first flat plate portion 101 and a first annular protrusion 11. The first annular protrusion 11 protrudes relative to the first flat plate portion 101. The first annular protrusion 11 includes a first corner hole 100. The first corner hole 100 is located at the top of the first annular protrusion 11. The top of the first annular protrusion 11 also includes a first corner hole welding surface 110 surrounding the first corner hole 100.

[0032] The second plate 2 includes a second flat plate portion 201, a distribution protrusion 22, and a distribution hole 220. The second flat plate portion 201 includes a second corner hole 200 and a second corner hole welding surface 210, with the second corner hole welding surface 210 surrounding the second corner hole 200. The distribution protrusion 22 protrudes relative to the second corner hole welding surface 210 and includes a protrusion top surface 221. The distribution hole 220 is located on the protrusion top surface 221.

[0033] The first corner hole welding surface 110 and the second corner hole welding surface 210 are arranged opposite to each other and fixed by welding. The first annular protrusion 11 and the distribution protrusion 22 protrude toward opposite sides. Along the radial direction of the second corner hole 200, the distribution protrusion 22 is located outside the second corner hole welding surface 210.

[0034] Through the above structural design, the distribution hole 220 in this utility model is located at the top of the distribution protrusion 22 that protrudes from the second flat plate portion 201 and is located outside the second corner hole welding surface 210. This allows the distribution hole 220 to have a distance from the second corner hole welding surface 210 in the radial direction of the corner hole, while forming a height difference with the second corner hole welding surface 210 in the height direction of the second plate 2 (i.e., the protrusion direction of the second heat exchange corrugation 23 described below). This prevents the solder on the second corner hole welding surface 210 from flowing into the distribution hole 220, causing the distribution hole 220 to become blocked and reducing the heat exchange performance of the plate heat exchanger.

[0035] Specifically, such as Figure 2 , Figure 3 , Figure 7 , Figure 8 As shown, the first plate 1 includes a first heat exchange corrugation 12, which protrudes relative to the first flat plate portion 101; the second plate 2 includes a second annular protrusion 21 and a second heat exchange corrugation 23, which protrude relative to the second flat plate portion 201 in the same direction; the first heat exchange corrugation 12 and the second heat exchange corrugation 23 are welded and fixed, and a fluid heat exchange space 40 is included between the first heat exchange corrugation 12 and the second heat exchange corrugation 23.

[0036] In the first plate 1 and the second plate 2 that are adjacent to each other, when the second flat plate portion 201 and the first annular protrusion 11 located on one side of the second plate 2 are welded and fixed, an interlayer communication channel 30 is included between the second annular protrusion 21 on the second plate 2 and the first flat plate portion 101 on the first plate 1 located on the other side of the second plate 2. The interlayer communication channel 30 is connected to the fluid heat exchange space 40 through the distribution hole 220.

[0037] Furthermore, the height of the welding surface of the second heat exchange corrugation 23 is defined as H1, and the height of the distribution protrusion 22 is defined as h1. Then, 1 / 5H1≤h1≤4 / 5H1, and h1≥0.5mm. There is a certain distance between the distribution protrusion 22 and the welding surface of the second heat exchange corrugation 23 to ensure smooth fluid flow.

[0038] Furthermore, such as Figure 14 As shown, the top of the second annular protrusion 21 includes an annular welding surface 212, which is welded and fixed to the first flat plate portion 101. The second annular protrusion 21 includes an inner peripheral wall 211. Taking the plane where the second flat plate portion 201 is located as the projection plane, the projection of the inner peripheral wall 211 is located outside the projection of the second corner hole 200 and the projection of the distribution protrusion 22. The minimum distance between the projection of the inner peripheral wall 211 and the projection of the distribution protrusion 22 is defined as M1, then the distance M1 ≥ 2mm. The minimum distance between the outer contour of the projection of the distribution protrusion 22 and the outer contour of the projection of the first annular protrusion 11 is defined as N1, then the distance N1 ≥ 2mm. That is, in the interlayer connecting channel 30, there is a certain distance between the distribution protrusion 22 and the annular welding surface 212, and in the fluid heat exchange space 40 connected to the interlayer connecting channel 30, there is a certain distance between the distribution protrusion 22 and the second corner hole welding surface 210, so as to prevent the solder from flowing into the distribution hole 220 through the second flat plate portion 201 when the first plate 1 and the second plate 2 are welded.

[0039] Furthermore, such as Figure 7 , Figure 8 As shown, the second annular protrusion 21 and the second heat exchange corrugation 23 are of equal height and interconnected, meaning that an annular fluid passage connecting the second annular protrusion 21 and the first flat plate portion 101 spaced apart from it is formed by the annular fluid passage connecting the fluid heat exchange space 40. The heat exchange fluid flowing into the fluid heat exchange space 40 through the distribution hole 220 can flow to various directions around the corner hole via this annular fluid passage, which is beneficial for the uniform distribution of the heat exchange fluid.

[0040] Furthermore, such as Figure 5 , Figure 6As shown, the top surface 221 of the distribution protrusion 22 is annular, and the diameter of the distribution hole 220 is defined as d1. The distance between the hole wall of the distribution hole 220 and the outer edge of the top surface 221 is at least 0.5d1. Taking the plane where the second flat plate portion 201 is located as the projection plane, the distribution hole 220 and the outer edge of the top surface 221 have a gap. This facilitates the positioning and processing of the distribution hole 220 and further moves the distribution hole 220 away from the welding area, preventing solder from flowing into the distribution hole 220.

[0041] Furthermore, taking the plane where the second flat plate 201 is located as the projection plane, the line connecting the center of the projection of the second corner hole 200 and the center of the distribution hole 220 is defined as L1, and the acute angle formed by the line L1 and the width direction of the second plate 2 is defined as ∠a1. Then, 20°≤∠a1≤75°. The distribution hole 220 points to the edge of the heat exchange plate in the width direction, which is conducive to the distribution of heat exchange fluid to the entire plate surface, increases the flow path of the fluid, and improves the heat exchange efficiency.

[0042] In another embodiment, such as Figures 9 to 13 As shown, this utility model provides a plate heat exchanger, including multiple alternatingly stacked first plates 1 and second plates 2. The first plate 1 includes a first flat plate portion 101, a first annular protrusion 11, a distribution protrusion 22, and a distribution hole 220. The first annular protrusion 11 protrudes relative to the first flat plate portion 101 and includes a first corner hole 100 located at the top of the first annular protrusion 11. The top of the first annular protrusion 11 also includes a first corner hole welding surface 110 surrounding the first corner hole 100. The distribution protrusion 22 protrudes relative to the first flat plate portion 101 and includes a protrusion top surface 221. The distribution hole 220 is located at the protrusion top surface 221.

[0043] The second plate 2 includes a second flat plate portion 201 and a second annular protrusion 21. The second flat plate portion 201 includes a second corner hole 200 and a second corner hole welding surface 210. The second corner hole welding surface 210 is disposed around the second corner hole 200. The first corner hole welding surface 110 and the second corner hole welding surface 210 located on one side of the second plate 2 are disposed opposite to each other and fixed by welding. Along the radial direction of the second corner hole 200, the distribution protrusion 22 is located outside the second corner hole welding surface 210.

[0044] like Figure 14 As shown, the top of the second annular protrusion 21 includes an annular welding surface 212, which is welded and fixed to the first flat plate portion 101 located on the other side of the second plate 2. The second annular protrusion 21 includes an inner peripheral wall 211, with the plane where the second flat plate portion 201 is located as the projection plane. The projection of the inner peripheral wall 211 is located outside the projection of the first corner hole 100 and the projection of the distribution protrusion 22.

[0045] Through the above structural design, the distribution hole 220 in this embodiment is located outside the first annular protrusion 11 of the first plate 1. Compared with the scheme where the distribution protrusion 22 is set on the second flat plate 201 inside the second annular protrusion 21, the first flat plate 101 has a larger area and is less affected by the deformation caused by the processing of the distribution protrusion 22. While keeping the welding area of ​​the first plate 1 and the second plate 2 unchanged, it is beneficial to improve the structural strength of the plate.

[0046] Furthermore, such as Figure 12 , Figure 13 As shown, the first plate 1 includes a first heat exchange corrugation 12, which protrudes relative to the first flat plate portion 101, and the distribution protrusion 22 and the first heat exchange corrugation 12 have the same protrusion direction; the second plate 2 includes a second heat exchange corrugation 23, and the second annular protrusion 21 and the second heat exchange corrugation 23 protrude relative to the second flat plate portion 201 in the same direction; the first heat exchange corrugation 12 and the second heat exchange corrugation 23 are welded and fixed, and a fluid heat exchange space 40 is included between the first heat exchange corrugation 12 and the second heat exchange corrugation 23; in adjacent first plates 1 and second plates 2, when the second flat plate portion 201 and the first annular protrusion 11 are welded and fixed, an interlayer communication channel 30 is included between the second annular protrusion 21 on the second plate 2 and the first flat plate portion 101 on the first plate 1, and the interlayer communication channel 30 is connected to the fluid heat exchange space 40 through the distribution hole 220.

[0047] Furthermore, the second annular protrusion 21 and the second heat exchange corrugation 23 are of equal height and interconnected, meaning that an annular fluid passage connecting the second annular protrusion 21 and the first flat plate portion 101 spaced apart from it is formed by the annular fluid passage connecting the fluid heat exchange space 40. The heat exchange fluid flowing into the fluid heat exchange space 40 through the distribution hole 220 can flow to various directions around the corner hole via this annular fluid passage, which is beneficial for the uniform distribution of the heat exchange fluid.

[0048] Let H2 be the height of the welding surface of the first heat exchange corrugation 12, and h2 be the height of the distribution protrusion 22. Then, 1 / 5H2≤h2≤4 / 5H2, and h2≥0.5mm. The distribution protrusion 22 protrudes towards the fluid heat exchange space 40, so that there is a larger flow area between the second flat plate portion 201 and the distribution protrusion 22 in the interlayer flow channel, which is conducive to the smooth entry of fluid into the fluid heat exchange space 40.

[0049] Furthermore, taking the plane where the second flat plate 201 is located as the projection plane, the minimum distance between the projection of the inner peripheral wall 211 and the projection of the distribution protrusion 22 is defined as M2, then the distance M2 ≥ 2mm; the minimum distance between the outer contour of the projection of the distribution protrusion 22 and the outer contour of the projection of the first annular protrusion 11 is defined as N2, then the distance N2 ≥ 2mm. That is, in the interlayer connecting channel 30, there is a certain distance between the distribution protrusion 22 and the annular welding surface 212, and in the fluid heat exchange space 40 connected to the interlayer connecting channel 30, there is a certain distance between the distribution protrusion 22 and the corner hole welding surface, to prevent the solder from flowing into the distribution hole 220 through the first flat plate 101 when welding the first plate 1 and the second plate 2.

[0050] Furthermore, taking the plane where the second flat plate 201 is located as the projection plane, the line connecting the center of the projection of the first corner hole 100 and the center of the distribution hole 220 is defined as L2, and the acute angle formed by the line L2 and the width direction of the first plate 1 is defined as ∠a2. Then, 20°≤∠a2≤75°. The distribution hole 220 points to the edge of the heat exchange plate in the width direction, which is beneficial for the heat exchange fluid to flow and distribute throughout the entire plate surface, increasing the fluid flow path and improving heat exchange efficiency.

[0051] In the two embodiments described above, such as Figure 7 , Figure 8 , Figure 12 , Figure 13 , Figure 14 As shown, the first plate 1 includes a first heat exchange corrugation 12 and a first reinforcing part 13. The first heat exchange corrugation 12 and the first reinforcing part 13 protrude in the same direction relative to the first flat plate 101. The protrusion height of the first reinforcing part 13 is equal to the maximum protrusion height of the first heat exchange corrugation 12. The first reinforcing part 13 is located outside the first flat plate 101. The first reinforcing part 13 is connected to the first heat exchange corrugation 12. The first reinforcing part 13 is welded and fixed to the second plate 2.

[0052] The second plate 2 includes a second reinforcing portion 24 and a second annular protrusion 21, which is located outside the second corner hole 200. The second reinforcing portion 24 is located outside the second annular protrusion 21 and is flush with the second flat plate portion 201. The second reinforcing portion 24 is welded and fixed to the first reinforcing portion 13. By providing the first reinforcing portion 13 and the second reinforcing portion 24, the pressure-bearing capacity at the corner of the plate is enhanced, and the strength of the welded structure around the corner hole is improved.

[0053] Furthermore, the first reinforcing part 13 and the first heat exchange corrugation 12 have the same height and are interconnected. That is, in the three adjacent heat exchange plates, the first reinforcing part 13 and the second reinforcing part 24 on the second plate 2 located on one side are adjacent and welded together. The position of the welding surface corresponds to the position of the fluid heat exchange space 40 connected by the distribution hole 220. Specifically, the refrigerant enters the fluid heat exchange space 40 through the distribution hole 220. The refrigerant has a fast flow rate and a large fluid pressure. Therefore, the first reinforcing part 13 and the second reinforcing part 24 on the first plate 1 and the second plate 2 including the fluid heat exchange space 40 are welded together to improve the plate fit strength on the corner hole side and increase the pressure resistance of the plate around the corner hole.

[0054] Furthermore, the aforementioned first reinforcing portion 13 and the second reinforcing portion 24 on the second plate 2 located on the other side are arranged opposite to each other and spaced apart. The first flat plate portion 101 on the first plate 1 and the second flat plate portion 201 on the second plate 2 are adjacent to each other and welded together. Therefore, a flow channel is included between the first reinforcing portion 13 and the second reinforcing portion 24 on this side. This flow channel can maintain fluid flow and prevent the heat exchange medium from stagnating around the corner hole, causing freezing and thus resulting in plate cracking and failure.

[0055] 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.

[0056] The above examples illustrate the principles and implementation methods of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the technical solution and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A plate heat exchanger comprising a plurality of first plates (1) and second plates (2) arranged in an alternating stack, characterized in that, The first plate (1) includes a first flat plate portion (101) and a first annular protrusion (11). The first annular protrusion (11) protrudes relative to the first flat plate portion (101). The first annular protrusion (11) includes a first corner hole (100). The first corner hole (100) is located at the top of the first annular protrusion (11). The top of the first annular protrusion (11) also includes a first corner hole welding surface (110) surrounding the first corner hole (100). The second plate (2) includes a second flat plate portion (201), a distribution protrusion (22), and a distribution hole (220). The second flat plate portion (201) includes a second corner hole (200) and a second corner hole welding surface (210), and the second corner hole welding surface (210) is disposed around the second corner hole (200). The distribution protrusion (22) protrudes relative to the second corner hole welding surface (210), and the distribution protrusion (22) includes a protrusion top surface (221). The distribution hole (220) is located on the protrusion top surface (221). The first corner hole welding surface (110) and the second corner hole welding surface (210) are arranged opposite to each other and fixed by welding. The first annular protrusion (11) and the distribution protrusion (22) protrude toward opposite sides. Along the radial direction of the second corner hole (200), the distribution protrusion (22) is located outside the second corner hole welding surface (210).

2. The plate heat exchanger according to claim 1, characterized in that The second plate (2) includes a second heat exchange corrugation (23) that protrudes relative to the second flat plate (201). The distribution protrusion (22) and the second heat exchange corrugation (23) have the same protrusion direction. The second heat exchange corrugation (23) is welded and fixed to the first plate (1). The height of the welding surface of the second heat exchange corrugation (23) is defined as H1, and the height of the distribution protrusion (22) is defined as h1. Then 1 / 5H1≤h1≤4 / 5H1, and h1≥0.5mm.

3. The plate heat exchanger according to claim 2, characterized in that The second plate (2) includes a second annular protrusion (21), the top of which includes an annular welding surface (212), which is welded and fixed to the first plate portion (101). The second annular protrusion (21) includes an inner peripheral wall (211), with the plane where the second plate portion (201) is located as the projection plane. The projection of the inner peripheral wall (211) is located outside the projection of the second corner hole (200) and the projection of the distribution protrusion (22).

4. The plate heat exchanger according to claim 3, characterized in that The second plate (2) includes a second annular protrusion (21), and the second annular protrusion (21) includes an inner peripheral wall (211). Taking the plane where the second flat plate (201) is located as the projection plane, the projection of the inner peripheral wall (211) is located outside the projection of the second corner hole (200) and the projection of the distribution protrusion (22). The minimum distance between the projection of the inner peripheral wall (211) and the projection of the distribution protrusion (22) is defined as M1, then M1≥2mm.

5. The plate heat exchanger according to claim 4, characterized in that The first plate (1) includes a first heat exchange corrugation (12), which protrudes relative to the first flat plate portion (101); the second plate (2) includes a second annular protrusion (21) and a second heat exchange corrugation (23), which protrude relative to the second flat plate portion (201) in the same direction; the first heat exchange corrugation (12) and the second heat exchange corrugation (23) are welded and fixed, and a fluid heat exchange space (40) is included between the first heat exchange corrugation (12) and the second heat exchange corrugation (23); In the adjacent first plate (1) and second plate (2), the second flat plate portion (201) and the first annular protrusion (11) are welded and fixed. An interlayer communication channel (30) is included between the second annular protrusion (21) on the second plate (2) and the first flat plate portion (101) on the first plate (1). The interlayer communication channel (30) is connected to the fluid heat exchange space (40) through the distribution hole (220).

6. The plate heat exchanger according to claim 5, characterized in that The raised top surface (221) is annular. The diameter of the distribution hole (220) is defined as d, and the distance between the hole wall of the distribution hole (220) and the outer edge of the raised top surface (221) is defined as P. Then P≥0.5d.

7. A plate heat exchanger according to claim 6, characterised in that Taking the plane where the second flat plate (201) is located as the projection plane, the line connecting the center of the projection of the second corner hole (200) and the center of the distribution hole (220) is defined as L1, and the acute angle formed by the line L1 and the width direction of the second plate (2) is defined as ∠a1. Then 20°≤∠a1≤75°.

8. The plate heat exchanger according to claim 7, characterized in that Taking the plane where the second flat plate (201) is located as the projection plane, the minimum distance between the outer contour of the projection of the distribution protrusion (22) and the outer contour of the projection of the first annular protrusion (11) is defined as N1, then N1≥2mm.

9. The plate heat exchanger according to claim 8, characterized in that The first plate (1) includes a first heat exchange corrugation (12) and a first reinforcing part (13). The first heat exchange corrugation (12) and the first reinforcing part (13) protrude in the same direction relative to the first flat plate (101). The protrusion height of the first reinforcing part (13) is equal to the maximum protrusion height of the first heat exchange corrugation (12). In the radial direction of the first corner hole (100), the first reinforcing part (13) is located outside the first flat plate (101). The first reinforcing part (13) is connected to the first heat exchange corrugation (12). The first reinforcing part (13) is welded and fixed to the second plate (2).

10. The plate heat exchanger according to claim 9, characterized in that The second plate (2) includes a second reinforcing part (24) and a second annular protrusion (21). In the radial direction of the second corner hole (200), the second annular protrusion (21) is located outside the second corner hole (200) and the distribution protrusion (22). The second reinforcing part (24) is located outside the second annular protrusion (21). The second reinforcing part (24) is flush with the second flat plate part (201). The second reinforcing part (24) is welded and fixed to the first reinforcing part (13).

11. A plate heat exchanger comprising a plurality of first plates (1) and second plates (2) arranged in an alternating stack, characterized in that The first plate (1) includes a first flat plate portion (101), a first annular protrusion (11), a distribution protrusion (22), and a distribution hole (220). The first annular protrusion (11) protrudes relative to the first flat plate portion (101). The first annular protrusion (11) includes a first corner hole (100). The first corner hole (100) is located at the top of the first annular protrusion (11). The top of the first annular protrusion (11) also includes a first corner hole welding surface (110) surrounding the first corner hole (100). The distribution protrusion (22) protrudes relative to the first flat plate portion (101). The distribution protrusion (22) includes a protrusion top surface (221). The distribution hole (220) is located at the protrusion top surface (221). The second plate (2) includes a second flat plate portion (201) and a second annular protrusion (21). The second flat plate portion (201) includes a second corner hole (200) and a second corner hole welding surface (210). The second corner hole welding surface (210) is disposed around the second corner hole (200). The first corner hole welding surface (110) and the second corner hole welding surface (210) located on one side of the second plate (2) are disposed opposite to each other and fixed by welding. Along the radial direction of the second corner hole (200), the distribution protrusion (22) is located outside the second corner hole welding surface (210). The top of the second annular protrusion (21) includes an annular welding surface (212), which is welded and fixed to the first flat plate portion (101) located on the other side of the second plate (2). The second annular protrusion (21) includes an inner peripheral wall (211), with the plane where the second flat plate portion (201) is located as the projection plane. The projection of the inner peripheral wall (211) is located outside the projection of the first corner hole (100) and the projection of the distribution protrusion (22).

12. The plate heat exchanger according to claim 11, characterised in that The first plate (1) includes a first heat exchange corrugation (12) that protrudes relative to the first flat plate (101). The distribution protrusion (22) and the first heat exchange corrugation (12) have the same protrusion direction. The first heat exchange corrugation (12) is welded and fixed to the second plate (2). The height of the welding surface of the first heat exchange corrugation (12) is defined as H2, and the height of the distribution protrusion (22) is defined as h2. Then 1 / 5H2≤h2≤4 / 5H2, and h2≥0.5mm.

13. The plate heat exchanger according to claim 11, characterized in that Taking the plane where the second flat plate (201) is located as the projection plane, the minimum distance between the projection of the inner peripheral wall (211) and the projection of the distribution protrusion (22) is defined as M2, then M2≥2mm; the minimum distance between the outer contour of the projection of the distribution protrusion (22) and the outer contour of the projection of the first annular protrusion (11) is defined as N2, then N2≥2mm.

14. A plate heat exchanger according to any of the claims 11-13, characterised in that The first plate (1) includes a first heat exchange corrugation (12), which protrudes relative to the first flat plate portion (101); the second plate (2) includes a second annular protrusion (21) and a second heat exchange corrugation (23), which protrude relative to the second flat plate portion (201) in the same direction; the first heat exchange corrugation (12) and the second heat exchange corrugation (23) are welded and fixed, and a fluid heat exchange space (40) is included between the first heat exchange corrugation (12) and the second heat exchange corrugation (23); In adjacent first plate (1) and second plate (2), the second flat plate portion (201) and the first annular protrusion (11) are welded and fixed. An interlayer communication channel (30) is included between the second annular protrusion (21) on the second plate (2) and the first flat plate portion (101) on the first plate (1). The interlayer communication channel (30) is connected to the fluid heat exchange space (40) through the distribution hole (220).

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