Plate heat exchanger

Abstract

The plate heat exchanger comprises a plurality of stacked plate sheets, the plate sheets at least comprise the first plate sheets and the second plate sheets, the first plate sheets and the second plate sheets are stacked at intervals, the first plate sheets are provided with first plate flat parts, first separation ribs and a plurality of first protrusions, and the second plate sheets are provided with second plate flat parts, second separation ribs and a plurality of second protrusions. The first partition rib protrudes relative to the first plate flat part, the first protrusion protrudes relative to the first plate flat part, the first plate sheet is at least provided with a first corner hole and a second corner hole, the first corner hole and the second corner hole are located in the two sides of the first partition rib, the plate heat exchanger is provided with fins, and the fins are located in the first partition rib. Therefore, the device is suitable for different fluid properties.

Description

Technical Field

[0001] This application relates to the technical field of heat exchangers, and particularly to a plate heat exchanger. Background Art

[0002] A plate heat exchanger is used for heat transfer of liquids, usually for heat exchange between two fluids at different temperatures. The plate heat exchanger can be applied in a thermal management system for heat exchange between a refrigerant and a coolant. Since heat exchange performance is a very important indicator in the thermal management system, the design of the plate heat exchanger will particularly consider heat exchange performance.

[0003] Generally, a plate heat exchanger exchanges heat between two fluids, and there are raised bumps on the plate to improve the turbulence of the fluid. When the fluid properties differ significantly, the raised bumps on the plate have different effects on fluids with different properties, which will have a certain impact on the overall heat exchange performance.

[0004] For another common plate heat exchanger, in order to enhance the turbulence of the fluid in the heat exchanger and improve the heat exchange performance of the heat exchanger, fins are added between two adjacent plates. Due to the arrangement of the fins, this type of heat exchanger generally can only be in the form of diagonal flow. Based on certain specific occasions where the inlet and outlet need to be arranged on the same side, this type of heat exchanger is difficult to apply. Summary of the Invention

[0005] The purpose of the present invention is to provide a plate heat exchanger that can be used in specific interface occasions and is suitable for different fluid properties.

[0006] To achieve the above purpose, the following technical solution is adopted: A plate heat exchanger includes a plurality of stacked plates. The plates at least include a first plate and a second plate. The first plate and the second plate are stacked at intervals. The first plate has a first flat part, a first partition rib, and a plurality of first protrusions. The first partition rib protrudes relative to the first flat part, and the first protrusions protrude relative to the first flat part. The first plate at least has a first corner hole and a second corner hole, and the first corner hole and the second corner hole are located on both sides of the first partition rib. The second plate has a second partition rib. At least part of the first partition rib corresponds to at least part of the second partition rib and is welded. The plate heat exchanger has fins. The fins are located between the adjacent first plate and the second plate, and the first protrusions are welded and fixed to one side of the second plate, and the fins are welded and fixed to the other side of the second plate.

[0007] In the plate heat exchanger of the above technical solution, since the first plate has the first partition rib and the second plate has the second partition rib, at least part of the first partition rib corresponds to at least part of the second partition rib and is welded. The first corner hole and the second corner hole are located on both sides of the first partition rib, so that the fluid can be blocked by the first partition rib and the second partition rib, with a longer flow path and can be used in specific interface occasions. At the same time, since the first plate has the first protrusion and the plate heat exchanger has fins, the fins are located between the adjacent first plate and the second plate, and the first protrusion is welded and fixed to one side of the second plate, and the fins are welded and fixed to the other side of the second plate. In this way, the heat exchanger can be applied to the cases with different fluid properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic structural diagram of an embodiment of the plate heat exchanger of the present invention;

[0009] Figure 2 is Figure 1 A partial cross-sectional view of the plate heat exchanger, in which structures such as the first protrusion are omitted;

[0010] Figure 3 It is a schematic structural diagram of an embodiment of the first plate of the plate heat exchanger of the present invention;

[0011] Figure 4 It is a partial structural diagram of the first protrusion;

[0012] Figure 5 It is a schematic structural diagram of another embodiment of the first plate of the plate heat exchanger of the present invention;

[0013] Figure 6 It is a schematic structural diagram of an embodiment of the second plate of the plate heat exchanger of the present invention;

[0014] Figure 7 It is a simple schematic diagram of a fin of the plate heat exchanger of the present invention;

[0015] Figure 8 It is a schematic structural diagram of another embodiment of the second plate of the plate heat exchanger of the present invention;

[0016] Figure 9 It is a schematic structural diagram of another embodiment of the first plate of the plate heat exchanger of the present invention;

[0017] Figure 10 It is a schematic structural diagram of another embodiment of the first plate of the plate heat exchanger of the present invention;

[0018] In the figure, plate heat exchanger 100, first plates 11, 11', 11", 11''', first plate flat part 111, first partition rib 112, first protrusion 113, first corner hole 114, second corner hole 115, first blocking part 1121, main body part 1122, first end part 112a, second end part 112b; third corner hole 116, fourth corner hole 117, first side part 118, second side part 119; corner hole area 1101, middle heat exchange area 1102, flow area 1103; second plates 12', 12", second partition rib 121, second plate flat part 124; second blocking part 1212; first fluid channel 1001, second fluid channel 1002; length direction L, width direction W, thickness direction H.

[0019] First heat exchange area 101, second heat exchange area 102, first edge area 103, first central area 104, second edge area 105, second central area 106, linear channel 107, first type of protrusion 113a, second type of protrusion 113b, fin 13, accommodation area 131, first distance d1, second distance d2, third distance d3, fourth distance d4. Detailed implementation manners

[0020] The following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. It should be understood that the following is only illustrative and does not limit the scope of the present application.

[0021] Refer to Figures 1-2 , Figure 1 As shown, a plate heat exchanger 100 is schematically shown. The plate heat exchanger 100 includes a plurality of stacked plates. The plates at least include a first plate 11 and a second plate 12. The first plate 11 and the second plate 12 are stacked at intervals. The plate heat exchanger at least includes a first fluid channel 1001 and a second fluid channel 1002. At least part of the first fluid channel 1001 is located between adjacent first plates 11 and second plates 12. At least part of the second fluid channel 1002 is located between adjacent first plates 11 and second plates 12, and the first fluid channel 1001 and the second fluid channel 1002 are not connected. Among them, the stacking direction is the thickness direction H.

[0022] As other implementation manners, the plate heat exchanger may also have three fluid channels, which can be used for heat exchange of fluids at three temperatures in the plate heat exchanger. Or it may also have more fluid channels, which will not be elaborated here. The plates of the plate heat exchanger may also have a third plate, a fourth plate, which can be set according to the number of fluid channels.

[0023] Specifically, refer to Figure 3, the first plate 11 has a first flat portion 111, a first partition rib 112 and a first protrusion 113. The first partition rib 112 protrudes relative to the first flat portion 111, the first protrusion 113 protrudes relative to the first flat portion 111, and the protruding directions of the first partition rib 112 and the first protrusion 113 relative to the first flat portion 111 are the same.

[0024] It should be known that the first partition rib protrudes relative to the first flat portion, the first protrusion protrudes relative to the first flat portion, and the protruding directions of the first partition rib and the first protrusion may also be different.

[0025] The first plate 11 has at least a first corner hole 114 and a second corner hole 115. The first corner hole 114 and the second corner hole 115 are located on both sides of the first partition rib 112. The first corner hole 114 and the second corner hole 115 are communicated to allow a fluid to flow through.

[0026] The heat exchanger has a length direction L and a width direction W. The first partition rib 112 has more than two first blocking portions 1121 extending along the width direction W. The first partition rib 112 has a main body portion 1122 and the first blocking portions 1121. The first blocking portions 1121 protrude in the width direction W of the main body portion 1122. The first blocking portions 1121 are arranged at intervals, and at least one first protrusion 113 is arranged between adjacent first blocking portions 1121. Or rather, at least a part of at least one of the first protrusions 113 is located between adjacent first blocking portions 1121. The first protrusions 113 and the first blocking portions 1121 are arranged in an interleaved manner, so that the fluid channels between the first protrusions 113 and the first blocking portions 1121 are curved. In the length direction L of the first plate 11, at least a part of the first blocking portions 1121 and the first protrusions 113 located between adjacent first blocking portions overlap. In this article, the overlapping arrangement means that in the length direction, the blocking portions and the first protrusions have corresponding parts, so that the first blocking portions and the first protrusions can be arranged in an interleaved manner. Thus, the fluid flow path at the first partition rib is non-linear, so that the resistance received by the fluid at the position of the first partition rib is relatively large. Therefore, it can advantageously reduce the fluid flow rate at the first partition rib, and can be used to improve the fluid flow rate distribution in the heat exchanger and improve the heat exchange efficiency.

[0027] The first plate 11 has a corner hole area 1101, a middle heat exchange area 1102, and a communication area 1103. The first corner hole, the second corner hole, etc. are located in the corner hole area 1101, and the first protrusion 113 is located in the middle heat exchange area 1102. The middle heat exchange area 1102 includes a first heat exchange area 101 and a second heat exchange area 102. The first heat exchange area 101 and the second heat exchange area 102 are respectively arranged on both sides of the first partition rib 112. The first heat exchange area 101 further includes a first edge area 103 and a first central area 104. The first edge area 103 is closer to the side of the first plate 11 than the first central area 104, and the first central area 104 is closer to the first partition rib 112 of the first plate 11 than the first edge area 103. The first edge area 103 and the first central area 104 are demarcated by the boundary O in the length direction of the first plate 11. The distance between adjacent first protrusions 113 in the first edge area 103 is the first distance d1, and the distance between adjacent first protrusions 113 in the first central area 104 is the second distance d2. The first distance d1 is greater than the second distance d2. In this way, the layout of the first protrusions 113 in the first edge area 103 is sparser, and the layout of the first protrusions 113 in the first central area 104 is denser, so that the fluid in the first heat exchange area 101 can be more distributed to the first edge area 103, making the fluid in the first heat exchange area 101 more uniform and improving the heat exchange effect. When the first protrusion is a regular shape, the distance between adjacent first protrusions can be the distance between the centers of the two first protrusions, as shown in the figure. When the first protrusion is an irregular shape, the distance between adjacent first protrusions is the shortest distance between the two.

[0028] The second heat exchange area 102 includes a second edge area 105 and a second central area 106. The second edge area 105 is closer to the side of the first plate 11 than the second central area 106, and the second central area 106 is closer to the first partition rib 112 of the first plate 11 than the second edge area 105. The second edge area 105 and the second central area 106 are demarcated by the boundary O' in the length direction of the first plate 11. The distance between adjacent ones in the second edge area 105 is the third distance d3, and the distance between adjacent ones in the second central area 106 is the fourth distance d4. The third distance d3 is greater than the fourth distance d4. In this way, the layout of the first protrusions 113 in the second edge area 105 is sparser, and the layout of the first protrusions 113 in the second central area 106 is denser, so that the fluid in the second heat exchange area 102 can be more distributed to the second edge area 105, making the fluid in the second heat exchange area 102 more uniform and improving the heat exchange effect.

[0029] The distance between adjacent first protrusions 113 in the first edge region 103 and the distance between adjacent first protrusions 113 in the second edge region 105 may be the same or different. The boundary between the first edge region 103 and the first central region 104 at the position of the first heat exchange region 101 may be different from or the same as the boundary between the second edge region 105 and the second central region 106 at the position of the second heat exchange region 102.

[0030] The first edge region 103 has a linear channel 107 which extends along the length direction L of the first plate 11, and the length of the linear channel 107 is not less than 1 / 3 of the length of the first partition rib 112. When the fluid entering the first heat exchange region 101 through the first corner hole 114 can flow along the linear channel 107, the linear channel 107 in the first edge region 103 helps the fluid to disperse into the first edge region 103 and helps with fluid distribution.

[0031] The first plate 11 further has a third corner hole 116 and a fourth corner hole 117. The first corner hole 114 and the second corner hole 115 are part of the first fluid channel 1001, and the third corner hole 116 and the fourth corner hole 117 are part of the second fluid channel 1002.

[0032] Refer to Figure 6 , Figure 6 which schematically shows the structure of a second plate 12'. The second plate 12' also has a first corner hole 114, a second corner hole 115, a third corner hole 116, and a fourth corner hole 117. The second plate 12' has a second partition rib 121. The third corner hole 116 and the fourth corner hole 117 are located on both sides of the second partition rib 121. Taking the line connecting the centers of the third corner hole 116 and the fourth corner hole 117 as the width direction W, the second partition rib 121 has a second blocking portion 1212 extending along the width direction W. The structure of the second partition rib 121 can generally refer to the first partition rib 112 and will not be elaborated here. Here Figure 6 only as an example, the structure of the second partition rib and Figure 3 the first partition rib in have different forms. However, when the first plate and the second plate need to be used in combination, the forms of the first partition rib and the second partition rib need to be the same so that the first partition rib and the second partition rib can be stacked.

[0033] To describe the fluid relationship more clearly, the fluid flowing in the first fluid channel 1001 is defined as the first fluid, and the fluid flowing in the second fluid channel 1002 is defined as the second fluid. Through the cross-stacking of the first plate 11 and the second plate 12', the first fluid entering from the first corner hole 114 flows on one side of the first plate 11 and is blocked by the first partition rib 112, flowing in a substantially U shape on the first plate 11, and then leaving from the second corner hole 115. The second fluid entering from the third corner hole 116 flows on the other side of the first plate 11 and is blocked by the second partition rib 121, flowing in a substantially U shape on the second plate 12', and then leaving from the fourth corner hole 117. In this way, the flow paths of the first fluid and the second fluid in the plate heat exchanger can be longer, and the fluid is blocked by the first blocking portion 1121 of the first partition rib 112 on the first plate and the second blocking portion 1212 of the second partition rib 121 on the second plate, making the fluid distribution on the plate more uniform.

[0034] In this embodiment, the first corner holes 114 of the first plates 11 are aligned to form a part of the first fluid channel 1001, the second corner holes 115 of the first plates 11 are aligned to form a part of the first fluid channel 1001, the third corner holes 116 of the first plates 11 are aligned to form a part of the second fluid channel 1002, and the fourth corner holes 117 of the first plates 11 are aligned to form a part of the second fluid channel 1002.

[0035] In this embodiment, the third distance d3 is greater than the first distance d1, and the fourth distance d4 is greater than the second distance d2, so that the fluid after passing through the first partition rib is more evenly distributed in the second heat exchange area.

[0036] The top of the first protrusion 113 of the first plate 11 and the second flat portion 124 of the second plate 12' are welded and fixed. In this way, the multiple first protrusions 113 of the first plate 11 and the second plate 12' are welded and fixed, which is beneficial to enhancing the welding strength between the first plate 11 and the second plate 12', and at the same time, the fluid can flow along the gaps between the adjacent first protrusions 113, and the turbulence effect is better.

[0037] Return to reference Figure 3, the first dividing rib 112 extends along the length direction L of the first plate 11. The first plate 11 has a first side portion 118 and a second side portion 119 arranged along the length direction L. The first dividing rib 112 is connected to the first side portion 118. There is a flow-through area 1103 between the first dividing rib 112 and the second side portion 119. One end of the first dividing rib 112 connected to the first side portion 118 is the first end portion 112a, and the other end of the first dividing rib 112 is the second end portion 112b. The distance between the first end portion 112a and the first blocking portion 1121 is between 1 / 2 and 6 / 7 of the length of the first dividing rib 112. The distance between the first blocking portion 1121 and the first end portion 112a can be used to effectively intercept the fluid flowing along the first dividing rib 112, increasing the fluid resistance at the first dividing rib 112 and facilitating the uniform distribution of the fluid.

[0038] Refer to Figure 4 , in the width direction W of the first plate 11, the radiation width L of two adjacent first protrusions 113 in the first central area 104 is less than the sum of the diameters D of the two first protrusions 113. In this way, there is no straight path along the length direction of the plate between the gaps between adjacent first convex points, enabling the fluid to flow circuitously along the outer periphery of the first convex points and increasing the flow resistance.

[0039] Refer to Figures 5-7 , the plate heat exchanger has a plurality of first plates 11" and second plates 12' stacked. A part of the first heat exchange channel or the second heat exchange channel is formed between one side of the first plate 11" having the first protrusion 113 and one side of the second plate 12'. There is a fin 13 between the other side of the second plate 12' and the opposite side of the first protrusion 113 of the first plate 11". The structure of the second plate 12' is different from that of the first plate 11".

[0040] The structure of the first plate 11" is generally similar to Figure 3 the embodiment shown. The first plate 11" has a first plate flat portion 111, a first dividing rib 112, and a first protrusion 113. The first dividing rib 112 protrudes relative to the first plate flat portion 111, and the first protrusion 113 protrudes relative to the first plate flat portion 111. The protruding directions of the first dividing rib 112 and the first protrusion 113 relative to the first plate flat portion 111 are the same. The first plate 11" has at least a first corner hole 114 and a second corner hole 115, and the first corner hole 114 and the second corner hole 115 are located on both sides of the first dividing rib 112. The first corner hole 114 and the second corner hole 115 are communicated for a fluid to flow through.

[0041] It is defined that the first plate 11" has a first heat exchange area 101 and a second heat exchange area 102. The first heat exchange area 101 and the second heat exchange area 102 are respectively arranged on both sides of the first partition rib 112. The first heat exchange area 101 further includes a first edge area 103 and a first central area 104. The first edge area 103 is closer to the side of the first plate 11" than the first central area 104. The first central area 104 is closer to the first partition rib 112 of the first plate 11" than the first edge area 103. The first edge area 103 and the first central area 104 are demarcated by the boundary in the length direction of the first plate 11". The distance between adjacent first protrusions 113 in the first edge area 103 is the first distance d1, and the distance between adjacent first protrusions 113 in the first central area 104 is the second distance d2. The first distance d1 is greater than the second distance d2. In this way, the layout of the first protrusions 113 in the first edge area 103 is sparser, and the layout of the first protrusions 113 in the first central area 104 is denser, so that the fluid in the first heat exchange area 101 can be more distributed to the first edge area 103, making the fluid in the first heat exchange area 101 more uniform and improving the heat exchange effect.

[0042] The second heat exchange area 102 includes a second edge area 105 and a second central area 106. The second edge area 105 is closer to the side of the first plate 11" than the second central area 106. The second central area 106 is closer to the first partition rib 112 of the first plate 11" than the second edge area 105. The second edge area 105 and the second central area 106 are demarcated by the boundary in the length direction of the first plate 11". The distance between adjacent first protrusions 113 in the second edge area 105 is the third distance d3, and the distance between adjacent first protrusions 113 in the second central area 106 is the fourth distance d4. The third distance d3 is greater than the fourth distance d4. In this way, the layout of the first protrusions 113 in the second edge area 105 is sparser, and the layout of the first protrusions 113 in the second central area 106 is denser, so that the fluid in the second heat exchange area 102 can be more distributed to the second edge area 105, making the fluid in the second heat exchange area 102 more uniform and improving the heat exchange effect.

[0043] The distance between adjacent first protrusions 113 in the first edge area 103 and the distance between adjacent first protrusions 113 in the second edge area 105 can be the same or different. The demarcation position between the first edge area 103 and the first central area 104 in the first heat exchange area 101 can be different from or the same as the demarcation position between the second edge area 105 and the second central area 106 in the second heat exchange area 102.

[0044] The first plate 11" also has a third corner hole 116 and a fourth corner hole 117. The first corner hole 114 and the second corner hole 115 are part of the first fluid channel 1001, and the third corner hole 116 and the fourth corner hole 117 are part of the second fluid channel 1002.

[0045] The structure of the second plate 12' is different from that of the first plate 11", but the second plate 12' also has a first corner hole 114, a second corner hole 115, a third corner hole 116, and a fourth corner hole 117.

[0046] Define the side of the first plate 11" with the first protrusion 113 as the front side, and the other side as the back side. One side of the second plate 12' is welded to the front side of the first plate 11", and at least part of the other side of the second plate 12' is welded to the fin 13. The top of the first protrusion 113 of the first plate 11" is welded and fixed to one side of the second flat part 124 of the second plate 12', and the other side of the second flat part of the second plate 12' is welded and fixed to the fin. In this heat exchanger, one fluid flows through the front part of the first plate 11 (the position where the first protrusion 113 is defined as the front part), and this fluid is distributed by the first protrusion 113. Another fluid flows through the back part of the first plate 11, and this fluid is distributed by the fin structure. In this way, it can be applied to two different fluids with significantly different fluid characteristics.

[0047] The first plate 11" has a first protrusion 113 and a first partition rib 112. The first partition rib has a first blocking part 1121 protruding in the width direction W, and the first blocking part 1121 can protrude along both sides in the width direction. The second plate 12' has a second partition rib 121. At least part of the second partition rib 121 corresponds to the position of the first partition rib 112. The first partition rib 112 and the second partition rib 121 can also be aligned. The protruding side part of the first partition rib 112 abuts against the recessed side part of the second partition rib 121 and is welded and fixed. In this way, the first partition rib 112 and the second partition rib 121 are welded to block the fluid communication between the straight-line distances of the first corner hole 114 and the second corner hole 115, so that the fluid can flow along a substantially U-shaped path. The second partition rib 121 also has a second blocking part 1212 for increasing the fluid turbulence at the partition rib.

[0048] The fin 13 has a receiving area 131, and the second partition rib 121 can be located in the receiving area 131. As another embodiment, the first partition rib can also be located in the receiving area 131.

[0049] In this embodiment, the fin 13 has a receiving area 131. The protruding directions of the first partition rib 112 and the first protrusion 113 are different. The protruding directions of the first partition rib 112 and the second partition rib 121 are the same. The first partition rib 112 protrudes towards the fin 13. One side of the fin 13 is fixedly welded to the first flat plate portion 111, and one side of the fin 13 is fixedly welded to the second flat plate portion 124. The first partition rib 112 and the second partition rib 121 are aligned and welded, which can be used to block the communication between two adjacent holes in the width direction, so that the fluid can move along a U-shaped path. In addition, a first blocking portion and a second blocking portion are respectively provided on the first partition rib 112 and the second partition rib 121, so that the fluid flow path is non-linear, increasing the turbulence, and making it easier to improve the heat exchange performance of the heat exchanger.

[0050] Refer to Figure 8 , Figure 8 FIG. [FIG. number] is a schematic structural diagram of the second plate 12''; the second partition rib 121 is recessed from the second flat plate portion 124 of the second plate. At least a part of the first partition rib 112 of the first plate may also be located within the second partition rib 121 of the second plate. The protruding tops or sides of the adjacent first partition rib 112 of the first plate and the second partition rib 121 of the second plate are fixedly welded. In this way, the welding position is at the protruding top or side position of the first partition rib 112 and the second partition rib 121, which is convenient for welding.

[0051] In this article, multiple generally means more than two, especially more than three.

[0052] As other embodiments, refer to Figure 9 , Figure 9 FIG. [FIG. number] is a schematic diagram of another first plate 11'. The first protrusion 113 has a first type of protrusion 113a and a second type of protrusion 113b. The first type of protrusion 113a is located in the first heat exchange area 101, and the second type of protrusion 113b is located in the second heat exchange area 102. The first type of protrusion 113a can be a quasi-circular protrusion, including a circle, an ellipse, etc.; the second type of protrusion 113b can be an angular protrusion, including a rhombus, a triangle, etc. The second type of protrusion 113b has a straight outer wall relative to the first type of protrusion, which helps to guide the fluid. It should be understood that the first protrusion structures in the first heat exchange area and the second heat exchange area can be the same or different.

[0053] In other embodiments, for example, refer to Figure 10, the first partition rib of the first plate 11”’ includes a main body portion 1122, a first blocking portion 1121 and a straight section 1123. The main body portion 1122 of the first plate is correspondingly arranged and welded to the main body portion of the second plate. The first blocking portion of the first plate and the second blocking portion of the second plate are correspondingly arranged and welded. The protruding height of the straight section 1123 of the first plate is different from the protruding height of the main body portion of the first plate. The protruding height of the straight section is slightly lower than that of the main body portion. The straight section 1123 of the first plate is welded to the second flat portion of the second plate. Thus, in Figure 10 the figure shown, the fluid on the first plate can flow from the first corner hole 114 to the second corner hole 115.

[0054] It should be noted that the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. For example, the definition of directions such as "front", "rear", "left", "right", "up", and "down". Although the present invention has been described in detail with reference to the above embodiments in this specification, those of ordinary skill in the art should understand that those skilled in the art can still combine, modify or equivalently replace the present invention. All technical solutions and their improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A plate heat exchanger, comprising a plurality of stacked plates, the plates at least including a first plate (11, 11', 11") and a second plate (12', 12"), the first plate (11, 11', 11") and the second plate (12', 12") being stacked at intervals, characterized in that, The first plate pieces (11, 11', 11") have a first flat part (111), a first dividing rib (112), and a plurality of first protrusions (113). The first dividing rib (112) protrudes relative to the first flat part (111), and the first protrusions (113) protrude relative to the first flat part (111). The first plate pieces (11, 11', 11") have at least a first corner hole (114) and a second corner hole (115). The first corner hole (114) and the second corner hole (115) are located on both sides of the first dividing rib (112). The second plate pieces (12', 12") have a second dividing rib (121). At least a part of the first dividing rib (112) corresponds to at least a part of the second dividing rib (121) and is welded. The plate heat exchanger has fins (13). The fins (13) are located between adjacent first plate pieces (11, 11', 11") and second plate pieces (12', 12"), and the first protrusions (113) are welded and fixed to one side of the second plate pieces (12', 12"), and the fins (13) are welded and fixed to the other side of the second plate pieces (12', 12").

2. The plate heat exchanger according to claim 1, wherein The fins (13) have a receiving area (131), and the second dividing rib (121) or the first dividing rib (112) is located in the receiving area (131).

3. The plate heat exchanger according to claim 1, characterized in that, The fins (13) have a receiving area (131). The protruding direction of the first dividing rib (112) is different from that of the first protrusions (113). The protruding directions of the first dividing rib (112) and the second dividing rib (121) are the same. The first dividing rib (112) protrudes towards the fins (13). The fins (13) are welded and fixed to one side of the first flat part (111), and the fins (13) are welded and fixed to one side of the second flat part (124) of the second plate pieces (12', 12").

4. The plate heat exchanger according to claim 1 or 2 or 3, characterized in that, The first dividing rib (112) has more than two first blocking parts (1121) extending in the width direction. The first blocking parts (1121) are arranged at intervals, and at least a part of at least one first protrusion (113) is located between adjacent first blocking parts (1121); the second dividing rib has more than two second blocking parts (1212) extending in the width direction, and the second blocking parts (1212) are arranged at intervals.

5. The plate heat exchanger according to claim 4, characterized in that, The protruding height of the first dividing rib (112) is the same as that of the first protrusions (113); in the length direction of the first plate pieces (11, 11'), most of the first blocking parts (1121) and the first protrusions (113) located between adjacent first blocking parts (1121) are cross - arranged, and the center line of the first protrusions (113) located between adjacent first blocking parts (1121) in the length direction is located between adjacent first blocking parts (1121).

6. The plate heat exchanger according to claim 1 or 2 or 3, characterized in that, It is defined that the first plate (11, 11', 11") has a first heat exchange area (101) and a second heat exchange area (102). The first heat exchange area (101) and the second heat exchange area (102) are respectively arranged on both sides of the first partition rib (112). The first heat exchange area (101) further includes a first edge area (103) and a first central area (104). The first edge area (103) is closer to the edge side of the first plate (11, 11') relative to the first central area (104). The first central area (104) is closer to the first partition rib (112) relative to the first edge area (103). The distance between adjacent first protrusions (113) in the first edge area (103) is a first distance (d1), and the distance between adjacent first protrusions (113) in the first central area (104) is a second distance (d2). The first distance (d1) is greater than the second distance (d2).

7. The plate heat exchanger according to claim 6, characterized in that, The first edge area (103) has a linear channel (107). The linear channel (107) extends along the length direction of the first plate (11, 11', 11"), and the length of the linear channel (107) is not less than 1 / 3 of the length of the first partition rib (112).

8. The plate heat exchanger according to claim 6, characterized in that, In the width direction of the first plate (11, 11', 11"), the radiation width (L) between two adjacent first protrusions (113) in the first central area (104) is less than the sum of the diameters (D) of the two first protrusions (113).

9. The plate heat exchanger according to claim 6, characterized in that, The second heat exchange area (102) includes a second edge area (105) and a second central area (106). The second edge area (105) is closer to the edge side of the first plate (11, 11', 11") relative to the second central area (106). The second central area (106) is closer to the first partition rib (112) relative to the second edge area (105). The distance between adjacent first protrusions (113) in the second edge area (105) is a third distance (d3), and the distance between adjacent first protrusions (113) in the second central area (106) is a fourth distance (d4). The third distance (d3) is greater than the fourth distance (d4), the third distance (d3) is greater than the first distance (d1), and the fourth distance (d4) is greater than the second distance (d2).

10. The plate heat exchanger according to claim 1 or 2 or 3, characterized in that, The first protrusion (113) has a first type of protrusion (113a) and a second type of protrusion (113b). The first type of protrusion (113a) is located in the first heat exchange area (101), and the second type of protrusion (113b) is located in the second heat exchange area (102). The first type of protrusion (113a) is a quasi-circular protrusion; the second type of protrusion (113b) is a angular protrusion.

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