Plate heat exchanger and heat exchange plate

Abstract

The invention provides a plate heat exchanger and heat exchange plates, the plate heat exchanger comprises a plurality of stacked heat exchange plates, a flow channel is formed in the space between every two adjacent heat exchange plates, one end of each heat exchange plate is provided with a first corner hole and a second corner hole, and the first corner holes and the second corner holes communicate with the flow channels corresponding to the first sides of the heat exchange plates. The third corner hole and the fourth corner hole are communicated with the runner corresponding to the second side of the heat exchange plate; the plate heat exchanger comprises a first blocking part, the first blocking part is located between the first corner hole and the second corner hole, the first blocking part is provided with a first end and a second end, the first corner hole is an inlet hole, and the second corner hole is an outlet hole; a first blocking strip is arranged between the first corner hole and the first end of the first blocking part, and the second blocking strip is adjacent to the second end. According to the scheme, the flowing uniformity of a medium in the heat exchange plate can be improved, and the heat exchange effect is improved.

Description

Technical Field

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

[0002] A plate heat exchanger includes a plurality of stacked heat exchange plates. Corner holes are provided at the four corners of each heat exchange plate, and the corner holes are used for the inflow or outflow of a medium. Flow channels are formed between two adjacent heat exchange plates. The medium can flow into the corresponding flow channel from one corner hole and then flow out from another corner hole. Two adjacent flow channels are used for flowing different media. Since the medium flows into the flow channel from one corner hole and then flows out from another corner hole, the medium has a tendency to flow along the shortest path, resulting in the medium not flowing along the entire area of the heat exchange plate and affecting the heat exchange effect. Summary of the Invention

[0003] The purpose of the present application is to provide a plate heat exchanger and heat exchange plates, which can improve the uniformity of the medium flowing in the heat exchange plates and enhance the heat exchange effect.

[0004] The present application provides a plate heat exchanger, which includes a plurality of stacked heat exchange plates. The space between two adjacent heat exchange plates forms a flow channel. The heat exchange plate has two ends distributed along a first direction. One end of the heat exchange plate has a first corner hole and a second corner hole. The heat exchange plate has a first side and a second side distributed along the thickness direction. The first corner hole, the second corner hole and the flow channel corresponding to the first side of the heat exchange plate are communicated.

[0005] The plate heat exchanger includes a first blocking portion located between two adjacent heat exchange plates. The first blocking portion is located between the first corner hole and the second corner hole and extends along the first direction. The first blocking portion has a first end close to the first corner hole and a second end far from the first corner hole. The first corner hole is an inlet hole, and the second corner hole is an outlet hole. The plate heat exchanger further includes a first blocking strip and a second blocking strip. The first blocking strip is located between the first corner hole and the first end of the first blocking portion, and the second blocking strip is adjacent to the second end.

[0006] The present application also provides a heat exchange plate. The heat exchange plate has two ends distributed along a first direction. One end of the heat exchange plate has a first corner hole and a second corner hole. The heat exchange plate has a first side and a second side distributed along the thickness direction. The first corner hole, the second corner hole and the flow channel corresponding to the first side of the heat exchange plate are communicated.

[0007] The heat exchange plate is provided with a first barrier portion, which is located between the first corner hole and the second corner hole and extends along the first direction. The first barrier portion is a stamping structure, and the first barrier portion is a rib protruding from the second side. The first barrier portion has a first end close to the first corner hole and a second end far from the first corner hole. The first corner hole is an inlet hole, and the second corner hole is an outlet hole. The heat exchange plate is further provided with a first blocking strip and a second blocking strip. The first blocking strip is arranged between the first corner hole and one end of the first barrier portion, and the second blocking strip is adjacent to the second end.

[0008] Due to the arrangement of the first blocking strip on the heat exchange plate of the plate heat exchanger in this application, when the medium flows out from the first corner hole, part of the medium flows towards the position of the first barrier portion, while part of the medium can flow towards the side of the heat exchange plate under the blocking of the first blocking strip, away from the first barrier portion. In this way, the medium can be relatively evenly distributed in the area on one side of the heat exchange plate away from the first barrier portion; similarly, due to the arrangement of the second blocking strip, when the medium passes over the second end of the first barrier portion, part of it flows towards the position of the first barrier portion, and part of the medium flows towards the other side of the heat exchange plate under the blocking action of the second blocking strip. In this way, the medium can be relatively evenly distributed in the area on the other side of the heat exchange plate away from the first barrier portion. It can be seen that due to the arrangement of the first blocking strip and the second blocking strip, the flow of the medium on the heat exchange plate is more uniform, and the heat exchange capacity can be improved. Brief Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the first heat exchange plate of the plate heat exchanger in the embodiment of the present application;

[0010] Figure 2 is Figure 1 a schematic diagram of the first heat exchange plate from another angle in

[0011] Figure 3 It is a schematic structural diagram of the second heat exchange plate of the office heat exchanger in the embodiment of the present application;

[0012] Figure 4 It is a schematic assembly diagram of the first heat exchange plate and the second heat exchange plate in the embodiment of the present application;

[0013] Figure 5 It is a cross-sectional view when three heat exchange plates are stacked together in the embodiment of the present application;

[0014] Figure 6 For the medium in Figure 1 a schematic diagram of the flow of the first heat exchange plate on the first side in

[0015] Figure 7 It is a schematic structural diagram of a heat exchange plate;

[0016] Figure 8 is Figure 1 an enlarged view of part A in

[0017] Figure 9 is Figure 1 an enlarged view of part B in

[0018] Figure 10 is a schematic diagram of the medium flowing on the first side of the second heat exchange plate in Figure 3 ;

[0019] Figure 11 is a schematic structural diagram of another first heat exchange plate in the embodiment of the present application.

[0020] Figure 1-11 The reference numerals in

[0021] are explained as follows: 101 - the first heat exchange plate; 102 - the second heat exchange plate;

[0022] 100A - the first side; 100B - the second side;

[0023] 100D - the first heat exchange area; 100C - the second heat exchange area;

[0024] 100a - the first flow channel; 100b - the second flow channel;

[0025] 11 - the first corner hole; 12 - the second corner hole; 13 - the third corner hole; 14 - the fourth corner hole;

[0026] 15 - the dot protrusion; 16 - the second barrier part; 17 - the first barrier part; 171 - the first end; 172 - the second end; 181 - the first blocking strip; 1811 - the first strip end; 182 - the second blocking strip; 1821 - the second strip end; 183 - the third strip; 184 - the fourth strip;

[0027] 101’ - the heat exchange plate; 11’ - the first corner hole; 12’ - the second corner hole; 13’ - the third corner hole; 14’ - the fourth corner hole; 17’ - the first barrier part. Detailed implementation manners

[0028] In order to enable those skilled in the art of the present technology to better understand the solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0029] Please refer to Figures 1 to 4 , Figure 1 which is a schematic structural diagram of the first heat exchange plate 101 of the plate heat exchanger in the embodiment of the present application; Figure 2 is Figure 1 a schematic diagram of another angle of the first heat exchange plate in Figure 3It is a schematic structural view of the second heat exchange plate 102 of the plate heat exchanger in the embodiment of the present application; Figure 4 It is an assembly schematic view of the first heat exchange plate 101 and the second heat exchange plate 102 in the embodiment of the present application; Figure 5 It is a cross-sectional view when three heat exchange plates are stacked together in the embodiment of the present application.

[0030] The plate heat exchanger in this embodiment includes a plurality of stacked heat exchange plates, specifically stacked in sequence along the thickness direction of the heat exchange plates. At this time, the space between two adjacent heat exchange plates can form a flow channel, and two adjacent heat exchange plates are respectively Figure 4 the first heat exchange plate 101 and the second heat exchange plate 102 shown in. It is defined that the heat exchange plate has a first side 100A and a second side 100B distributed along the thickness direction. Figure 1 In, the first side 100A is the upper side of the first heat exchange plate 101, the second side 100B is the lower side of the first heat exchange plate 101, and the same is true for the second heat exchange plate 102, which will not be elaborated. The first side 100A of the heat exchange plate and the second side 100B of another adjacent heat exchange plate are arranged oppositely, and a flow channel is formed therebetween. Figure 4 In, that is, the first side 100A of the first heat exchange plate 101 and the second side 100B of the second heat exchange plate 102 are arranged oppositely. It can be seen that the second side 100B of the first heat exchange plate 101 and the first side 100A of the heat exchange plate below it ( Figure 4 not shown in) are arranged oppositely, and the first side 100A of the second heat exchange plate 102 and the second side 100B of the heat exchange plate above it ( Figure 4 not shown in) are arranged oppositely. In the plate heat exchanger, two adjacent flow channels are not connected to each other, and two spaced flow channels are connected to each other. Two adjacent flow channels are respectively defined as a first flow channel 100a and a second flow channel 100b. As Figure 5 shown, the plate heat exchanger may include a plurality of first flow channels 100a and a plurality of second flow channels 100b.

[0031] It can be seen that in the stacking direction, except for the heat exchange plates at the top and bottom of the plate heat exchanger, only one side of each corresponding flow channel, the first side 100A of other heat exchange plates corresponds to the first flow channel 100a, that is, the surface of the first side 100A constitutes part of the wall of the first flow channel 100a, and the second side 100B corresponds to the second flow channel 100b, that is, the surface of the second side 100B is part of the wall of the second flow channel 100b. The two flow channels are respectively used to flow different kinds of media. For example, the first flow channel 100a is used to flow refrigerant, and the second flow channel 100b is used to flow water, etc. In this way, heat exchange between two media in the plate heat exchanger can be realized. It can be referred to Figure 4 for understanding. The black arrow indicates one kind of medium, and the white arrow indicates another kind of medium.

[0032] The heat exchange plate has two ends distributed in the first direction. In this embodiment, the heat exchange plate is generally rectangular. At this time, the first direction is the length direction of the heat exchange plate. A set of corner holes is provided at both ends of the heat exchange plate. A set of corner holes is the first corner hole 11 and the second corner hole 12 distributed in the second direction. Another set of corner holes is the third corner hole 13 and the fourth corner hole 14 distributed in the second direction. Among them, the second direction is perpendicular to the first direction. In this embodiment, the second direction is specifically the width direction of the heat exchange plate, that is, four corner holes are provided at the four corners of the heat exchange plate. As Figure 1 , 3 shown, the first corner hole 11 and the third corner hole 13 are arranged diagonally, and the second corner hole 12 and the fourth corner hole 14 are arranged diagonally. Here, the first corner hole 11, the second corner hole 12 are communicated with the first flow channel 100a corresponding to the first side 100A of the heat exchange plate. The first corner hole 11 is the inlet hole, and the second corner hole 12 is the outlet hole, that is, the medium can flow into the first flow channel 100a from the first corner hole 11 and flow out from the second corner hole 12; the third corner hole 13, the fourth corner hole 14 are communicated with the second flow channel 100b corresponding to the second side 100B of the heat exchange plate, that is, the medium can enter the second flow channel 100b from the third corner hole 13 and flow out from the fourth corner hole 14. Of course, it is also possible to enter from the fourth corner hole 14 and flow out from the third corner hole 13.

[0033] To achieve this function, the orifice parts of the first corner hole 11 and the second corner hole 12 close to the first side 100A are flush with the surface of the first side 100A, and the orifice parts close to the second side 100B have a distance from the surface of the second side 100B. The first corner hole 11 and the second corner hole 12 protrude from the surface of the second side 100B to form an annular boss structure; the orifice parts of the third corner hole 13 and the fourth corner hole 14 close to the first side 100A have a distance from the surface of the first side 100A, that is, they protrude from the surface of the first side 100A to form an annular boss structure, and the orifice parts close to the second side 100B are flush with the surface of the second side 100B, as Figure 5 shown.

[0034] It can be seen that a set of corner holes of the heat exchange plate are arranged in the opposite direction to another set of corner holes, and the first corner holes 11 and 12 of the first heat exchange plate 101, and the third corner holes 13 and fourth corner holes 14 of the second heat exchange plate 102 are located at the same end along the length direction. The third corner holes 13 and fourth corner holes 14 of the first heat exchange plate 101, and the first corner holes 11 and 12 of the second heat exchange plate 102 are located at the same end along the length direction. In this way, the annular boss structures of the third corner holes 13 and fourth corner holes 14 of the first heat exchange plate 101 on the first side 100A abut against the annular boss structures of the first corner holes 11 and 12 of the second heat exchange plate 102 on the second side 100B, thereby separating the second flow channel 100b and the first flow channel 100a. There is a spacing between the orifice parts of the first corner holes 11 and 12 of the first heat exchange plate 101 on the first side 100A and the orifice parts of the third corner holes 13 and fourth corner holes 14 of the second heat exchange plate 102 on the second side 100B, so that the first corner holes 11 and 12 of the first heat exchange plate 101, and the third corner holes 13 and fourth corner holes 14 of the second heat exchange plate 102 are all communicated with the first flow channel 100a.

[0035] Please continue to refer to Figure 6 , Figure 6 For the medium in Figure 1 the first side 100A of the first heat exchange plate 101

[0036] Schematic diagram of the flow of the medium, and the flow path of the medium is indicated by arrow marks.

[0037] In this embodiment, the plate heat exchanger includes a first blocking portion 17 located between two adjacent heat exchange plates. The first blocking portion 17 is located between the first corner holes 11 and 12 and extends along the first direction. The first blocking portion 17 in this embodiment is specifically a rib provided on the second side 100B of the heat exchange plate. For comparison Figure 1 , 2 Understand. In addition, from Figure 4 it can be seen that after the second heat exchange plate 102 and the first heat exchange plate 101 are assembled, the first blocking portion 17 on the second side 100B of the second heat exchange plate 102 will be welded and fixed to the first side 100A of the first heat exchange plate 101, thereby forming a barrier between the first heat exchange plate 101 and the second heat exchange plate 102, and the medium cannot pass through the position of the first blocking portion 17. Specifically, the rib as the first blocking portion 17 is formed by stamping, and the processing is simple. At this time, the first blocking portion 17 appears as a groove structure on the first side 100A of the heat exchange plate, as Figure 1 , 3 shown, the first blocking portion 17 is a groove structure on the first side 100A of the first heat exchange plate 101 and the first side 100A of the second heat exchange plate 102, as Figure 2As shown, on the second side 100B, it is shown as a rib structure. The first barrier portion 17 of the second heat exchange plate 102 and the first heat exchange plate 101 can be fixed by welding. At this time, the first barrier portion 17 on the second side 100B of the second heat exchange plate 102 can be inserted into the groove formed by the first barrier portion 17 of the first heat exchange plate 101 on the first side 100A for welding.

[0038] As Figure 1 , 3 shown, the first barrier portion 17 has a first end 171 close to the first corner hole 11 and a second end 172 far from the first corner hole 11. When the medium flows into the first flow channel 100a from the first corner hole 11, it will flow along the surface of the first side 100A. As Figure 6 shown, specifically, the medium will flow along the first barrier portion 17 towards the direction of the fourth corner hole 14, and then cross over the second end 172 of the first barrier portion 17 and flow back towards the position of the second corner hole 12, that is, roughly forming a U-shaped flow path, so that the medium can flow through the entire heat exchange plate as evenly as possible, thereby improving the heat exchange efficiency.

[0039] However, as Figure 7 shown, Figure 7 is a schematic structural diagram of a heat exchange plate 101'. This heat exchange plate 101' is provided with a first corner hole 11', a second corner hole 12', a third corner hole 13', a fourth corner hole 14' and a first barrier portion 17', but does not have a first blocking strip 181 and a second blocking strip 182. Since the medium tends to flow along the shortest path, when the medium flows out of the first corner hole 11, it is very easy to flow towards the direction close to the first barrier portion 17, that is, flow along one side of the first barrier portion 17 in the first direction. After crossing over from the end of the first barrier portion 17 and flowing back, it also flows along the shortest path to the second corner hole 12. In this way, only some areas on both sides of the heat exchange plate located at the first barrier portion 17 actually have the medium concentrated, and less medium flows in other areas. There is still a problem of uneven flow and insufficient heat exchange.

[0040] Accordingly, the heat exchange plate in this embodiment further includes a first blocking strip 181 and a second blocking strip 182. As Figure 8 , 9 shown, Figure 8 is Figure 1 an enlarged view of part A in Figure 9 is Figure 1 an enlarged view of part B in

[0041] Among them, the first blocking strip 181 is disposed between the first corner hole 11 and the first blocking portion 17. The second blocking strip 182 is adjacent to the second end 172, specifically, in this embodiment, it is disposed between the third corner hole 13 and the second end 172 of the first blocking portion 17. As the name implies, the blocking strip is a long strip structure, which has a length and a width, different from Figure 1 the dot protrusions 15 therein. From Figure 6 the perspective, the first blocking strip 181 blocks between the first corner hole 11 and the first end 171 of the first blocking portion 17, and the second blocking strip 182 blocks between the third corner hole 13 and the second end 172 of the first blocking portion 17. To achieve the blocking setting, the length direction of the blocking strip needs to intersect with the flow path of the medium in the unblocked case. Connect the centers of the first corner hole 11 and the first end 171 of the first blocking portion 17. Obviously, the length direction of the first blocking strip 181 and this connection line have an included angle, for example, it can be a perpendicular relationship, so as to prevent the medium from directly flowing to the first blocking portion 17, that is, it is horizontally placed on the path between the first corner hole 11 and the first end 171 of the first blocking portion 17; for the second blocking strip 182, it is horizontally placed on the flow path after the medium crosses the second end 172 of the first blocking portion 17.

[0042] With such a setting, it can be understood with reference to Figure 6 that due to the setting of the first blocking strip 181, when the medium flows out from the first corner hole 11, part of the medium flows towards the position of the first blocking portion 17, while part of the medium can flow towards the side of the first heat exchange plate 101 under the blocking of the first blocking strip 181, away from the first blocking portion 17. In this way, the medium can be relatively evenly distributed in the first heat exchange area 100D of the first heat exchange plate 101. The first heat exchange area 100D is the area on the first heat exchange plate 100 away from the first blocking portion 17. In this embodiment, the first heat exchange area 100D is the area between the first corner hole 11 and the fourth corner hole 14; similarly, due to the setting of the second blocking strip 182, when the medium crosses the second end 172 of the first blocking portion 17, part of it flows towards the position of the first blocking portion 17, and part of the medium flows towards the other side of the first heat exchange plate 101 under the blocking effect of the second blocking strip 182. In this way, the medium can be relatively evenly distributed in the second heat exchange area 100C of the area between the third corner hole 13 and the second corner hole 12 on the first heat exchange plate 101. The second heat exchange area 100C is the area on the other side of the first heat exchange plate 101 away from the first blocking portion 17. In this embodiment, the second heat exchange area 100C. It can be seen that due to the setting of the first blocking strip 181 and the second blocking strip 182, the flow of the medium on the heat exchange plate is more uniform, and the heat exchange capacity can be improved.

[0043] Looking at it again Figure 10 , Figure 10 for the medium in Figure 3Schematic diagram of the flow on the first side 100A of the second heat exchange plate 102, with arrows marking the flow path of the medium. The flow mode of the medium on the first side 100A of the second heat exchange plate 102 is the same as that on the first side 100A of the first heat exchange plate 101, except that the flow direction is opposite to that of the first heat exchange plate 101. The first heat exchange plate 101 flows counterclockwise in Figure 6 the perspective view, and the medium on the second heat exchange plate 102 flows clockwise in Figure 10 the perspective view. The principle of action of the first blocking strip 181 and the second blocking strip 182 of the second heat exchange plate 102 is the same as that of the first heat exchange plate 101, and will not be described repeatedly.

[0044] In addition, in this embodiment, the included angle a1 between the length direction of the first blocking strip 181 of the heat exchange plate and the first blocking portion 17 is not less than 30° and not greater than 90°. As Figure 8 shown, the included angle a2 between the length direction of the second blocking strip 182 and the first blocking portion 17 is not less than 90° and not greater than 120°, as Figure 9 shown. Figure 8 、 9 In

[0045] , X is the center line in the length direction of the first blocking portion 17. Within this angular range, the first blocking strip 181 can be placed horizontally on the flow path of the medium flowing from the first corner hole 11 to the first blocking portion 17 to block as much medium as possible from flowing towards the direction close to the first blocking portion 17. The second blocking strip 182 can be placed horizontally on the flow path after the medium crosses the second end 172 of the first blocking portion 17 to block as much medium as possible from flowing directly towards the position of the second corner hole 12.

[0046] For example, the lengths of both the first blocking strip 181 and the second blocking strip 182 can be set to 3 mm to 6 mm. If the length of the blocking strip is too short, it will not play a role in blocking and equalizing the flow of the medium. If the length of the blocking strip is too long, the flow resistance of the medium will be too large. Therefore, in this embodiment, the lengths of the first blocking strip 181 and the second blocking strip 182 are set to 3 mm to 6 mm, so as to balance blocking and equalizing the flow and ensure the smooth flow of the medium. Of course, according to the size change of the heat exchange plate, this length range can also be adjusted. Figure 8 、 9As shown, the first blocking strip 181 has a first strip end portion 1811 near the first end 171, and the distance d1 between the center of the first strip end portion 1811 and the center of the first end 171 of the first blocking portion 17 is 5 mm to 10 mm; the second blocking strip 182 has a second strip end portion 1821 near the second end 172, and the distance d2 between the center of the second strip end portion 1821 and the center of the second end 172 of the first blocking portion 17 is 5 mm to 10 mm. If the distances d1 and d2 are too close, the blocking and flow equalizing effects are not obvious; if the distances are too large, the medium after blocking may re-aggregate near the first blocking portion 17. Therefore, the distances are set to 5 mm to 10 mm to ensure the full play of the blocking and flow equalizing effects. It can be seen that when the number of the first blocking strip 181 and the second blocking strip 182 is large, the above distance setting is limited to the first blocking strip 181 closest to the first blocking portion 17 and the second blocking strip 182 closest to the first blocking portion 17.

[0047] In this embodiment, the number of the first blocking strip 181 and the second blocking strip 182 is one or two. Figure 1 、 3 In [description], the number of the first blocking strip 181 is one, and the number of the second blocking strip 182 is two. It can be seen that this is only an illustration, and other number setting forms are also possible, and it can be designed according to parameters such as the length of the flow path to be blocked and the area of the heat exchange plate surface.

[0048] When the number of the first blocking strip 181 or the second blocking strip 182 is two or more than two, the distance between two adjacent first blocking strips 181 is not less than 4 mm, and the distance between two adjacent second blocking strips 182 is not less than 4 mm. If the distance between two adjacent blocking strips is too close, the purpose of dispersed blocking cannot be achieved, so the distance is set to be not less than 4 mm.

[0049] When the number of blocking strips is set to be large, they can be arranged in parallel. As Figure 1 、 3 shown, two second blocking strips 182 are arranged in parallel, specifically on the flow path after the medium crosses the second end 172 of the first blocking portion 17, so as to better separate the medium.

[0050] Reference can continue to be made to Figure 11 , Figure 11 which is a schematic structural diagram of another first heat exchange plate 101 in the embodiment of the present application.

[0051] It is basically the same as the structure of the first heat exchange plate 101 in [[reference]], and the difference is only that Figure 1 in [[reference]], Figure 11In the first heat exchange plate 101, in addition to providing the first blocking strip 181 and the second blocking strip 182, a plurality of blocking strips are respectively provided on both sides of the first blocking portion 17 along the first direction, defined as the third blocking strip 183 and the fourth blocking strip 184. At this time, the plurality of third blocking strips 183 are arranged parallel to each other, and the plurality of fourth blocking strips 184 are also arranged parallel to each other. Figure 11 In addition to providing two first blocking strips 181 between the first corner hole 11 and the first end 171 of the first blocking portion 17, and providing two second blocking strips 182 between the third corner hole 13 and the second end 172 of the first blocking portion 17, a plurality of third blocking strips 183 are provided along one side of the first blocking portion 17, and a plurality of fourth blocking strips 184 are provided along the other side of the first blocking portion 17. The second blocking strip 182 and the fourth blocking strip 184 are also parallel to each other and are generally arranged along the first direction. In this way, the third blocking strip 183 and the fourth blocking strip 184 are beneficial to preventing the medium from approaching the first blocking portion 17 again after being blocked by the first blocking strip 181 and the second blocking strip 182, and can better limit the flow of a large amount of medium to the position of the first blocking portion 17, ensuring that the medium can be dispersed to other areas of the first heat exchange plate 101 for flow, making the heat exchange more sufficient. The parameters such as the length of the third blocking strip 183 and the fourth blocking strip 184 and the included angle with the first blocking portion 17 are the same as the parameter settings of the above-mentioned first blocking strip 181 and the second blocking strip 182, and will not be elaborated here.

[0052] It should be noted that in the above embodiment, the first blocking portion 17 is provided on the second side 100B of the heat exchange plate. It can be seen that the first blocking portion 17 can also be provided on the first side 100A. Figure 1 Taking [a certain perspective], the first side 100A of the first heat exchange plate 101 can be provided with a rib as the first blocking portion 17, that is, the rib protrudes upward from the first side 100A, and the second side 100B is a groove structure. Then, the first blocking portion 17 of the first heat exchange plate 101 can be inserted into the groove structure formed by the first blocking portion 17 of the second heat exchange plate 102 on the second side 100B for welding. It can be seen that the first blocking portion 17 may not be a stamping structure directly formed on the heat exchange plate. For example, the first blocking portion may also be a split blocking strip, which is directly welded between the first heat exchange plate 101 and the second heat exchange plate 102. However, forming the first blocking portion 17 by stamping is simpler in processing, lower in cost, and can also reduce a weld seam.

[0053] It is further understood that the barrier strip can be a stamped structure, with a convex structure on the first side 100A and a groove structure on the second side 100B, or the barrier strip and the heat exchange plate are separately arranged. In addition, the barrier strip in the embodiment of the present application is not limited to being arranged on the first side 100A of the heat exchange plate, for example, it can also be arranged on the second side 100B. When two adjacent heat exchange plates are welded, the barrier strip on the second side 100B is welded to the surface of the first side 100A, which can play the same barrier role.

[0054] In addition, in this embodiment, the first side 100A of the first heat exchange plate 101 and the second heat exchange plate 102 are both provided with a plurality of dot-shaped protrusions 15, and the dot-shaped protrusions 15 are of a stamping structure, that is, the dot-shaped protrusions 15 are of a groove structure on the second side 100B. Figure 5 It is understood that when the first heat exchange plate 101 and the second heat exchange plate 102 are arranged relative to each other, the dot-shaped protrusions 15 on the first side 100A of the first heat exchange plate 101 can be welded and fixed to the surface of the second side 100B of the second heat exchange plate 102, thereby forming a plurality of blocking positions between the two heat exchange plates, and the medium can only flow alternately between the plurality of blocking positions. The provision of the wave point protrusions 15 also plays the role of flow balancing, allowing the medium to flow as dispersedly as possible on the surface of the heat exchange plate.

[0055] The plate heat exchanger in this embodiment further includes a second blocking portion 16 located between two adjacent heat exchange plates, and the second blocking portion 16 blocks between the first corner hole 11 and the second corner hole 12. Figure 1 , 3 As shown, a second blocking portion 16 is disposed between the third corner hole 13 and the fourth corner hole 14. The second blocking portion 16 is a stamping structure. The second blocking portion 16 is a groove structure on the first side 100A. Figure 2 As shown, the second blocking portion 16 is a convex structure on the second side 100B. When the first heat exchange plate 101 and the second heat exchange plate 102 are arranged opposite to each other, the second blocking portion 16 of the second heat exchange plate 102 can be welded between the first corner hole 11 and the second corner hole 12 of the first heat exchange plate 101, thereby blocking the first corner hole 11 and the second corner hole 12, and preventing the medium from directly flowing from the first corner hole 11 to the second corner hole 12. It can be seen that the second blocking portion 16 can also be a convex structure arranged on the first side 100A of the heat exchange plate, and the convex structure can be a stamping structure or a split welded structure.

[0056] In this embodiment, both the first barrier portion 17 and the second barrier portion 16 are protrusions provided on the second side 100B of the heat exchange plate, and are groove structures on the first side 100A. At this time, the second barrier portion 16 is welded to the surface between the first corner hole 11 and the second corner hole 12 in a fitting manner. The height of the second barrier portion 16 can be approximately equal to the sum of the heights of the annular bosses of the two butt-jointed corner holes, so as to directly abut against the surface of the heat exchange plate for welding. The height of the first barrier portion 17 can be greater than the height of the second barrier portion 16. In this way, the first barrier portion 17 can be inserted into the groove on the back side of another first barrier portion 17 for welding, and the welding is more reliable.

[0057] In this article, specific examples are used to elaborate on the principle and implementation mode of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present application, several improvements and modifications can also be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A plate heat exchanger, characterized in that, It includes a plurality of stacked heat exchange plates. The space between adjacent heat exchange plates forms a flow channel. The heat exchange plates have two ends distributed in a first direction. One end of the heat exchange plate has a first corner hole (11) and a second corner hole (12). The heat exchange plate has a first side (100A) and a second side (100B) distributed in the thickness direction. The flow channel corresponding to the first corner hole (11), the second corner hole (12) and the first side (100A) of the heat exchange plate is communicated; The plate heat exchanger includes a first barrier portion (17) located between adjacent heat exchange plates. The first barrier portion (17) is located between the first corner hole and the second corner hole and extends along the first direction. The first barrier portion (17) has a first end (171) close to the first corner hole (11) and a second end (172) far from the first corner hole (11). The first corner hole (11) is an inlet hole, and the second corner hole (12) is an outlet hole; The plate heat exchanger also includes a first blocking strip (181) and a second blocking strip (182). The first blocking strip (181) is located between the first corner hole (11) and the first end (171) of the first barrier portion (17), and the second blocking strip (182) is adjacent to the second end (172).

2. The plate heat exchanger according to claim 1, wherein, The included angle between the length direction of the first blocking strip (181) and the first barrier portion (17) is not less than 30° and not more than 90°; The included angle between the length direction of the second blocking strip (182) and the first barrier portion (17) is not less than 90° and not more than 120°.

3. The plate heat exchanger according to claim 1, characterized in that, The lengths of the first blocking strip (181) and the second blocking strip (182) are 3 mm to 6 mm.

4. The plate heat exchanger according to claim 1, wherein The first blocking strip (181) has a first strip end (1811) close to the first end (171). The distance between the center of the first strip end (1811) and the center of the first end (171) of the first barrier portion (17) is 5 mm to 10 mm; The second blocking strip (182) has a second strip end (1821) close to the second end (172). The distance between the center of the second strip end (1821) and the center of the second end (172) of the first barrier portion (17) is 5 mm to 10 mm.

5. The plate heat exchanger according to any one of claims 1-4, characterized in that, The number of the first blocking strip (181) and the second blocking strip (182) is 1 or 2.

6. The plate heat exchanger according to claim 5, characterized in that, The distance between adjacent two first blocking strips (181) is not less than 4 mm, and the distance between adjacent two second blocking strips (182) is not less than 4 mm.

7. The plate heat exchanger according to any one of claims 1 to 4, characterized in that, A plurality of third blocking strips (183) are distributed along the first direction on one side of the first barrier portion (17), and a plurality of fourth blocking strips (184) are distributed along the first direction on the other side of the first barrier portion (17).

8. The plate heat exchanger according to claim 7, characterized in that, A plurality of the third blocking strips (183) are parallel to each other, and a plurality of the fourth blocking strips (184) are parallel to each other.

9. The plate heat exchanger according to any one of claims 1 to 4, characterized in that, A plurality of wave point protrusions (15) are provided on the first side of the heat exchange plate. The wave point protrusions (15) are stamping structures.

10. The plate heat exchanger according to any one of claims 1-4, characterized in that, Two adjacent heat exchange plates are a first heat exchange plate (101) and a second heat exchange plate (102) respectively. A first side (100A) of the first heat exchange plate (101) and a second side (100B) of the second heat exchange plate (101) are arranged oppositely. The first barrier portion (17) is a rib provided on the second side (100B) of the second heat exchange plate (102), and the rib is welded to the first side (100A) of the first heat exchange plate (101); or the first barrier portion (17) is a rib provided on the first side (100A) of the first heat exchange plate (101), and the rib is welded to the second side (100B) of the second heat exchange plate (102); the rib is a stamping structure.

11. The plate heat exchanger according to claim 10, characterized in that, The plate heat exchanger further includes a second barrier portion (16) located between the first heat exchange plate (101) and the second heat exchange plate (102), and the second barrier portion (16) blocks between the first corner hole (11) and the second corner hole (12). The second barrier portion (16) is a protrusion provided on the first side (100A) of the first heat exchange plate (101), and the protrusion is welded to the plate surface of the second side (100B) of the second heat exchange plate (102); or the second barrier portion (16) is a protrusion provided on the second side (100B) of the second heat exchange plate (102), and the protrusion is welded to the plate surface of the first side (100A) of the first heat exchange plate (101); the protrusion is a stamping structure; the height of the first barrier portion (17) is greater than the height of the second barrier portion (16).

12. A heat exchange plate, characterized in that, The heat exchange plate has two ends distributed along a first direction. One end of the heat exchange plate has a first corner hole (11) and a second corner hole (12). The heat exchange plate has a first side (100A) and a second side (100B) distributed along the thickness direction. The flow channels corresponding to the first corner hole (11), the second corner hole (12), and the first side (100A) of the heat exchange plate are communicated. The heat exchange plate is provided with a first barrier portion (17). The first barrier portion (17) is located between the first corner hole (11) and the second corner hole (12) and extends along the first direction. The first barrier portion (17) is a stamping structure. The first barrier portion (17) is a rib protruding from the second side. The first barrier portion (17) has a first end (171) close to the first corner hole (11) and a second end (172) far from the first corner hole (11). The first corner hole (11) is an inlet hole, and the second corner hole (12) is an outlet hole; the heat exchange plate is further provided with a first blocking strip (181) and a second blocking strip (182). The first blocking strip (181) is arranged between the first corner hole (11) and one end of the first barrier portion (17), and the second blocking strip (182) is adjacent to the second end (172).

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