Plate Heat Exchanger

Abstract

The plate heat exchanger of the present application includes a plurality of stacked plates, the plurality of plates include at least one group of adjacent first and second plates; any of the first and second plates has a substrate portion and a plurality of protrusions located in the main heat exchange area; the substrate portion is arranged in a plane on the front and back of the corresponding plate; the protrusion protrudes from the substrate portion on the front of the corresponding plate; the substrate portion includes a plurality of intersection portions and a plurality of channel portions, the channel portion is connected between two adjacent intersection portions along the first extension direction, the channel portion is connected between two adjacent protrusions along the second extension direction, and the maximum dimension of the channel portion along the second extension direction is less than or equal to the dimension of the channel portion along the first extension direction; the protrusion on the front of the first plate contacts at least a portion of the channel portion on the back of the second plate, and the recess formed by the protrusion of the second plate on the back of the second plate is arranged relative to at least a portion of the channel portion on the front of the first plate. The plate heat exchanger of the present application has good heat exchange performance.

Description

Technical Field

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

[0002] Typically, a plate heat exchanger includes a plurality of plates, which are stacked together by methods such as brazing, and the spaces between the plates are used for heat exchange fluid to flow.

[0003] Related technologies include, for example Figure 1 In the structure of the heat exchange plate shown in the figure, a plurality of recesses 12 and protrusions 13 are arranged on the surface of the plate body 11 of the heat exchange plate, and adjacent recesses 12 are connected by a curved transition, and the bottom of the curved surface is higher than the bottom of the recess 12. When the heat exchange fluid flows through the channel formed between adjacent heat exchange plates, the protrusion 13 is conducive to strengthening the fluid distribution effect in the lateral direction, and a vortex can be formed below the slender protrusion 13, thereby improving the heat exchange efficiency of the plate. However, there is still room for improvement in the heat exchange performance of the plate heat exchanger in the related art. Summary of the invention

[0004] The invention of the present application aims to provide a plate heat exchanger with better heat exchange performance.

[0005] The present application provides a plate heat exchanger, comprising a plurality of stacked plates, wherein the plurality of plates include at least one group of adjacent first and second plates; the plates have a front side and a back side arranged opposite to each other; the front side of the first plate and the back side of the second plate are opposite to each other; the first plate and the second plate are both provided with a main heat exchange area; any one of the first plate and the second plate has a base plate portion and a plurality of protrusions located in the main heat exchange area; the base plate portion is arranged in a plane on the front side and the back side of the corresponding plate; the protrusion protrudes from the base plate portion on the front side of the corresponding plate, and the protrusion forms a pit relative to the base plate portion on the back side of the corresponding plate;

[0006] The substrate portion includes a plurality of intersection portions and a plurality of channel portions, wherein the intersection portion is circumferentially provided with at least three protruding portions and at least three channel portions; the at least three protruding portions and at least three channel portions are all connected to the intersection portion; each channel portion is located between two adjacent protruding portions, and the line connecting the points at which the two adjacent protruding portions are closest to the center of the intersection portion coincides with the boundary line between the channel portion and the intersection portion; wherein, for the same channel portion, the channel portion is connected between two adjacent intersection portions along the first extension direction, and the channel portion is connected between two adjacent protruding portions along the second extension direction, and the maximum dimension of the channel portion along the second extension direction is less than or equal to the dimension of the channel portion along the first extension direction;

[0007] The raised portion on the front side of the first plate contacts at least part of the channel portion on the back side of the second plate, and the recess formed by the raised portion of the second plate on the back side of the second plate is arranged opposite to at least part of the channel portion on the front side of the first plate.

[0008] For any of the first plate and the second plate of the plate heat exchanger of the present application, the raised portion of the plate is raised relative to the base plate portion on the front side of the plate, and the recess formed by the raised portion on the back side of the plate is conducive to the fluid flowing through the back side of the plate to form eddies at the recesses to enhance the fluid mixing effect and improve the heat exchange efficiency. The intersection and channel portion connected at the front side of the plate are conducive to forming a relatively open channel structure, so as to facilitate the timely transport of fluid heat, which is overall conducive to establishing a heat extraction and transmission mechanism for convective heat exchange between adjacent plates, thereby enhancing the heat exchange performance of the plate heat exchanger product. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the relevant plate involved in the background technology of this application;

[0010] Figure 2 It is a structural schematic diagram of a plate heat exchanger provided in this application;

[0011] Figure 3 It is a front structural schematic diagram of a first plate provided by the present application;

[0012] Figure 4 yes Figure 3 A schematic diagram of the reverse structure of the first plate;

[0013] Figure 5 yes Figure 3 A schematic diagram of the partial structure of the front side of the first plate;

[0014] Figure 6 yes Figure 4 A schematic diagram of the local structure of the reverse side of the first plate;

[0015] Figure 7 This is a schematic diagram of an assembly structure of a first plate and a second plate provided in the present application;

[0016] Figure 8 This is a structural schematic diagram of a partial position of the front side of a second plate provided by the present application;

[0017] Fig. 9 This is another schematic diagram of the assembly structure of the first plate and the second plate provided by the present application;

[0018] Fig.10 is a partial structural schematic diagram of another first plate or second plate provided by the present application;

[0019] Fig.11This is another schematic diagram of the assembly structure of the first plate and the second plate provided by the present application;

[0020] Fig.12 This is another structural schematic diagram of a partial position of the front side of a first plate provided by the present application;

[0021] Fig.13 This is another structural schematic diagram of a partial position of the front side of a first plate provided by the present application;

[0022] Fig.14 yes Fig.13 Schematic diagram of the cross section along line AA;

[0023] Fig.15 It is a top view schematic diagram of another protrusion structure provided in the present application. DETAILED DESCRIPTION

[0024] Plate heat exchanger is a highly efficient and compact heat exchanger that can be widely used in refrigeration and air conditioning, new energy vehicles and other industries. Figures 2 to 15 In one embodiment of the present application, a plate heat exchanger 10 is provided. The main core part of the plate heat exchanger 10 includes a plurality of stacked plates 100. The plate heat exchanger 10 also includes a plurality of external pipes 20 arranged on one side of the thickness direction of the main heat exchange core. The external pipes 20 are used to connect to other system components.

[0025] The plurality of plates 100 include at least one group of adjacent first plates 101 and second plates 102. The plurality of plates 100 may also include multiple groups of adjacent first plates 101 and second plates 102, wherein the first plates 101 and second plates 102 are alternately arranged, and each plate 100 includes a front side 1001 and a back side 1002 arranged opposite to each other. The front side 1001 of the first plate 101 and the back side 1002 of the second plate 102 are opposite to each other. There is a gap between adjacent plates 100 for fluid flow. In the present application, the front side 1001 and the back side 1002 of the plate 100 are used to distinguish the two heat exchange surfaces of the plate opposite to each other. The surface of one side surrounded by the flange of the plate 100 can be defined as the back side 1002 of the plate 100, and correspondingly, the other side opposite to the back side 1002 is the front side 1001 of the plate 100. Of course, the reverse setting can also be made, that is, the surface on one side surrounded by the flange of the plate 100 is defined as the front side 1001 of the plate 100, and correspondingly, the other side opposite to the front side 1001 is the back side 1002 of the plate 100. Alternatively, the front side 1001 and the back side 1002 of the plate 100 can be defined by other ways of defining the front and back sides.

[0026] The first plate 101 and the second plate 102 are both provided with a main heat exchange area 11. Figure 3 and Figure 4The first plate 101 has a substrate portion 110 and a plurality of protrusions 111 located in its main heat exchange area 11. The substrate portion 110 is generally in the shape of a flat plate, that is, the surface of the substrate portion 110 located on the front side 1001 of the plate and the surface located on the back side 1002 of the plate are both arranged in a plane. The plurality of protrusions 111 are spaced apart from each other and the protrusions 111 protrude from the substrate portion 110 on the front side 1001 of the first plate 101. Accordingly, the protrusions 111 form a pit 112 relative to the substrate portion 110 on the back side 1002 of the first plate 101.

[0027] Similarly, the second plate 102 has a substrate portion 110 and a plurality of protrusions 111 located in its main heat exchange area 11, wherein the plurality of protrusions 111 are spaced apart from each other and the protrusions 111 protrude from the substrate portion 110 on the front side 1001 of the second plate 102, and correspondingly, the protrusions 111 form a recess 112 relative to the substrate portion 110 on the reverse side 1002 of the second plate 102.

[0028] The base plate 110 includes a plurality of intersections 12, and the intersections 12 have at least three protrusions 111 around them. Figure 5 Take the example of the intersection portion 12 having four raised portions 111 around it, that is, the intersection portion is a crossroad, and accordingly, the substrate portion 110 also has a plurality of channel portions 13, and the intersection portion 12 also has at least three channel portions 13 around it, Figure 5 Each channel portion 13 is located between two adjacent protrusions 111, and the two adjacent protrusions 111 are respectively at the center of the intersection portion 12 (with Figure 5 The line between the points closest to each other (in Figure 5 The line S0 in the example (for example) coincides with the boundary line between the channel portion 13 and the intersection portion 12. For the same channel portion 13, the channel portion 13 is connected between two intersection portions 12 along the first extension direction. The channel portion 13 is connected between two adjacent protrusions 111 along the second extension direction, referring to Figure 5 For the channel portion 13 located between two adjacent protrusions 111, the maximum spacing L2 between the intersections where the two adjacent protrusions 111 are connected to the channel portion 13 is less than the distance L1 between the center points of the two intersections 12 on both sides of the first extension direction of the channel portion 13. Thus, the channel portion 13 has an elongated shape extending from the intersection 12 and away from the intersection 12. The dimensions of the channel portion 13 along its second extension direction may be equal or unequal at different positions of the channel portion 13. The maximum dimension of the channel portion 13 along the second extension direction is less than or equal to the dimension of the channel portion 13 along the first extension direction. In the embodiment of the present application, it is illustrated that the maximum dimension of the channel portion 13 along the second extension direction is less than the dimension of the channel portion 13 along the first extension direction. The first extension direction may be the length direction of the channel portion 13, and the second extension direction may be the width direction of the channel portion 13.

[0029] The channel portion 13 may have a variety of shapes. The channel portion 13 is located in the two side edges on both sides of the second extension direction, and most of the areas of the two side edges may be straight lines; or most of the areas of the two side edges may be arc-shaped transitions; or most of the areas of one of the two side edges may be straight lines, and most of the areas of the other side wall may be arc-shaped transitions; the arc may be set inward or outward along the second extension direction; or the two sides may have a small spacing at both ends and a large spacing in the middle, etc., and even the channel portion 13 may be in a shape similar to an "S"-shaped twist. The present application does not impose any specific restrictions on the shape of the channel portion 13.

[0030] refer to Figure 7 As shown, when the first plate 101 and the second plate 102 are assembled together, the raised portion 111 on the front side 1001 of the first plate 101 contacts at least a portion of the channel portion 13 on the back side 1002 of the second plate 12, and the recess 112 formed by the raised portion 111 of the second plate 12 on the back side 1002 of the second plate 12 is arranged opposite to at least a portion of the channel portion 13 on the front side 1001 of the first plate 101. The raised portion 111 is welded and fixed to the adjacent plate through its top 21, and more welding points ensure the stability of the connection between the plates, which can effectively improve the strength of the product.

[0031] Figure 6 The pit 112 formed by the protrusion 111 on the back side 1002 of the plate is conducive to the formation of a larger scale "vortex" for the fluid to enhance heat exchange. Referring to the flow diagram of the black dotted line with an arrow, the fluid destroys the thermal boundary layer near the plate wall through the vortex, which can effectively sweep the heat from the plate wall, which can be simply understood as the heat "extraction" stage of the entire heat exchange process. Figure 5 As shown, the protrusion 111 protrudes on the front side 1001 of the plate, thereby forming a plurality of intersections 12 and channel portions 13 connected to the intersections 12. The plurality of channel portions 13 and the plurality of intersections 12 are connected to form a relatively smooth flow channel structure. When the fluid flows at a high speed on this side, the intersections 12 and the channel portions 13 serve as a "heat transport" structure, which can be referred to Figure 5 The black solid line with arrows in the middle indicates that the layout of the protrusions 111 is conducive to heat transfer. Figure 6The heat sucked by the "vortex" at the middle pit 112 is transported away in time. After the adjacent plates are assembled, a "vortex" can be formed on the back of the upper plate, and the relatively open channel structure of the lower plate transports the heat extracted from the "vortex". The plates arranged up and down are conducive to establishing a "convection heat exchange" mechanism between adjacent plates, and constructing a physical mechanism of vortex-enhanced convection heat exchange, that is, the generation-development-entrainment-peeling of the "vortex" completes the transfer and transportation of heat. This innovative heat exchange structure of the plate is conducive to making the plate heat exchanger obtain better heat exchange performance.

[0032] Figure 8 As shown in the front side 1001 of the second plate 102, the channel portion 13 includes a first sub-portion 133, a second sub-portion 134 and a third sub-portion 135, and the first sub-portion 133 is connected between the second sub-portion 134 and the third sub-portion 135. For the two intersection portions 12 located on both sides of the first extension direction of the channel portion 13, one of the intersection portions 12 is connected to an end of the second sub-portion 134 on the first extension direction away from the first sub-portion 133, and the other intersection portion 12 is connected to an end of the third sub-portion 135 on the first extension direction away from the first sub-portion 133, and the second sub-portion 134 and the third sub-portion 135 of the channel portion 13 are equal in size along the first extension direction of the channel portion 13. Thus, the center of the first sub-portion 133 is approximately located at the midpoint position of the first extension direction of the channel portion 13. This is conducive to the uniformity of fluid flow. Of course, the sizes of the second sub-portion 134 and the third sub-portion along the first extension direction of the channel portion 13 may also be unequal. This application does not limit this.

[0033] refer to Fig. 9 As shown, when the first plate 101 and the second plate 102 are assembled together, the raised portion 111 on the front side 1001 of the first plate 101 is welded and fixed to the first sub-portion 133 corresponding to the channel portion 13 on the back side 1002 of the second plate 102 .

[0034] If the plate heat exchanger has only one set of first plate 101 and second plate 102, the plurality of channel portions 13 of the second plate 102 include at least one first channel portion 131, and the maximum dimension L4 of the second sub-portion 134 of the first channel portion 131 along the second extension direction of the first channel portion 13 and the maximum dimension L5 of the third sub-portion 135 along the second extension direction of the first channel portion 13 are both smaller than the maximum dimension L3 of the first sub-portion 134 along the second extension direction of the first channel portion 131. In order to simplify the difficulty of processing and manufacturing, the plurality of channel portions 13 of the plate heat exchanger 10 can be set to have a larger area in the middle position relative to the two sides, and the larger dimension of the first sub-portion 133 along the second extension direction of the first channel portion 131, i.e., the width direction, is conducive to expanding the welding area with another plate, providing the strength of the connection between the plates, thereby improving the stability of the product. Alternatively, a plurality of first channel portions 13 are provided in the plurality of channel portions 13 of the first plate 101 and the second plate 102, so that in the plate heat exchanger 10 having a plurality of first plates 101 and a plurality of second plates 102, the connection strength between adjacent first plates 101 and second plates 102 can be effectively improved.

[0035] Specifically, refer to Figure 8 The first channel portion 131 has a side portion 1311 intersecting with the raised portion 111, and the side portion 1311 extends substantially straight at the second sub-portion 134 and the third sub-portion 135, and the side portion 1311 bends and extends outward at the first sub-portion 133, that is, the side portion 1311 is in an arc shape at the first sub-portion 133 away from the central axis of the first channel portion 131 along the first extension direction, and the first channel portion 131 forms a shape that is thicker in the middle and thinner at both ends.

[0036] Alternatively, the side portion 1311 is generally arc-shaped and away from the central axis of the first channel portion 131 along the first extension direction, and the highest point of the arc is located at the first sub-portion 133, that is, the side portion 1311 is generally arc-shaped, and the highest point of the arc is located at the first sub-portion 133, which is conducive to making the maximum dimension L3 of the first sub-portion 133 along the second extension direction of the first channel portion 131, that is, the width direction, larger than the maximum dimensions of the other two sub-portions along the second extension direction of the first channel portion 131, that is, the width direction.

[0037] In some embodiments, the protrusion 111 has a top 21 and a side wall 22, the top 21 has a flat surface or a slightly curved surface for welding, and the side wall 22 is connected between the top 21 and the substrate 110. The side wall 22 has a junction 220 connected to the substrate 110, Fig.10 As shown, the intersection portion 220 includes a plurality of straight sections 221 and a plurality of transition sections 222. The plurality of straight sections 221 intersect with different channel portions 13 respectively.

[0038] The channel portion 13 is connected between the straight sections 221 of two adjacent protrusions 111. In some embodiments, the two straight sections 221 connected to the channel portion 13 are arranged in parallel. The extension direction of the plurality of straight sections 221 is fitted into a closed polygon, and the transition section 222 is connected between the ends of the extension direction of the adjacent straight sections 221, and the adjacent straight sections 221 are transitioned by the rounded corners of the transition section 222.

[0039] In some embodiments, the projection of the top 21 on a plane perpendicular to the stacking direction of the sheets is an ellipse, a perfect circle, a crescent, or a shape similar to a closed polygon. For example, the top 21 is an elongated rhombus. The side wall 22 between the straight section 221 and the top 21 is generally a plane inclined to the stacking direction of the sheets. Figure 5 As for the shape of the illustrated protrusion 111 , it is similar to a quadrangular pyramid, and the side wall 22 between the transition section 222 and the top 21 of the quadrangular pyramid is in an arc-shaped wall shape.

[0040] The first plate 101 and the second plate 102 can be plates of exactly the same size and shape, so they can be made by a mold with the same processing parameters. During assembly, one of the plates is horizontally rotated 180° relative to the other plate, which is conducive to reducing the manufacturing and management costs of the plates. Of course, in some other embodiments, the heights of the two plates may also be different, so the plates can also be made by molds with different processing parameters, so that the plates 100 with different protrusion heights of the protrusion 111 can be mixed, an asymmetric flow channel design can be achieved, and the matching effect between the ability of the fluid to generate a "vortex" to extract heat and the heat transport ability of the fluid can be adjusted to meet the requirements of different heat exchange performances.

[0041] refer to Fig.10 As shown. The several straight sections 221 of the intersection 220 of the raised portion 111 include a first straight section 301, a second straight section 302, a third straight section 303 and a fourth straight section 304. The extension directions of the four straight sections 221 are fitted into a quadrilateral. The shape of the quadrilateral can be a rectangle, a rhombus or other quadrilaterals. The first straight section 301, the second straight section 302, the third straight section 303 and the fourth straight section 304 can all be inclined relative to the length direction LL of the plate, and accordingly, the first extension direction of each channel portion 13 connected to the intersection portion 12 is inclined relative to the length direction LL of the plate.

[0042] The angle between the first straight section 301 and the second straight section 302 is recorded as the first angle β1, the angle between the third straight section 303 and the fourth straight section 304 is recorded as the second angle β2, the angle between the second straight section 302 and the third straight section 303 is recorded as the third angle β3, and the angle between the first straight section 301 and the fourth straight section 304 is recorded as the fourth angle β4. Each of the four angles can be an acute angle, a right angle, or an obtuse angle. And the four angles can have the same or different angles.

[0043] The line between the corner tip A of the first angle β1 and the corner tip B of the second angle β2 coincides with the length direction LL of the plate, and the line between the corner tip C of the third angle β3 and the corner tip D of the fourth angle β4 coincides with the width direction WW of the plate. The raised portions 111 are arranged in a grid-like matrix form, which is conducive to forming a "meandering" flow path of the fluid when the fluid flows on the plate, thereby enhancing the heat exchange effect of the plate.

[0044] The intersection 12 is connected to four channel portions 13 respectively. The four channel portions 13 include two second channel portions 136 and two third channel portions 138. The two second channel portions 136 extend from the intersection 12 to opposite directions, and the two third channel portions 138 extend from the intersection 12 to opposite directions.

[0045] refer to Fig.11 and Fig.12In some embodiments, the dimension L6 of the second channel portion 136 along the second extension direction thereof is greater than the dimension L7 of the third channel portion 138 along the second extension direction thereof. When the first plate 101 and the second plate 102 are assembled, the recess 112 formed by the raised portion 111 of the second plate 102 on the reverse side 1002 of the second plate 102 is disposed opposite to at least a portion of the third channel portion 138 on the front side 1001 of the first plate 101. The intersection portion 12 on the reverse side 1002 of the second plate 102 is disposed opposite to at least a portion of the second channel portion 136 on the front side 1001 of the first plate 101. The purpose of such arrangement is that, for the fluid flowing in the first channel portion 138, the upper portion thereof corresponds to the recess 112, so that the gap between the two plates is larger, and the space in which the fluid can flow is relatively larger, while for the fluid flowing in the second channel portion 136, the upper portion thereof corresponds to a part of the channel portion 13 of the second plate 102 and a part of the intersection portion 12, so that the gap between the two plates is smaller, and the space in which the fluid can flow is relatively smaller. In this way, when the fluid flows between the front side 1001 of the first plate 101 and the back side 1002 of the second plate 102, the flow resistance of the fluid in the channel portions 13 at different positions is unevenly distributed. Therefore, appropriately increasing the size of the second channel portion 136 in the second extension direction and / or appropriately decreasing the size of the third channel portion 138 in the second extension direction is conducive to smoother and faster flow of the fluid, thereby improving the heat exchange performance of the plate heat exchanger.

[0046] refer to Fig.13 and Fig.14 In some embodiments, the plurality of protrusions 111 include a plurality of first protrusions 113 and a plurality of second protrusions 114. At least a portion of the plurality of first protrusions 113 are distributed at the edge of the main heat exchange area 11. The closed polygon fitted in the extension direction of the four straight sections 221 of the second protrusions 114 may be a regular rectangle or rhombus. For the first protrusion 113, it is relatively closer to the corner hole of the plate, that is, the inlet and outlet of the fluid. The corner tip B of the second angle 32 of the first protrusion 113 is closer to the edge S1 in the width direction of the plate than the corner tip A of the first angle β1, and the angle of the second angle β2 is smaller than the angle of the first angle β1.

[0047] The transition section 222 between the first straight section 301 and the second straight section 302 is recorded as the first transition section 401, and the transition section 222 between the third straight section 303 and the fourth straight section 304 is recorded as the second transition section 402. The side wall 22 includes a first side wall 51 between the first transition section 401 and the top 21 and a second side wall 52 between the second transition section 402 and the top 21. Fig.14As shown, the inclination angle of the first side wall 51 relative to the plane perpendicular to the plate stacking direction is greater than the inclination angle of the second side wall 52 relative to the plane perpendicular to the plate stacking direction. This arrangement is conducive to the second side wall 52, which is closer to the fluid inlet and outlet, of the first protrusion 113 to guide the fluid into or out of the main heat exchange area 11 with a more gentle slope than the first side wall 51. When the fluid flows into the pit 112 through the second side wall 52 with a smaller slope, it is easier to form a "vortex" after hitting the first side wall 51 with a larger slope, thereby achieving the purpose of strengthening heat exchange.

[0048] The closed polygons fitted in the extension direction of the plurality of straight sections 221 of the intersection 220 may be other shapes besides quadrilaterals, such as hexagons, and even two or more shapes of protrusions 111 may be provided in the same plate. Fig.15 As shown, some embodiments of the present application provide protrusions 111 of other shapes. Fig.15 The raised portion 111 is illustrated by fitting its straight section 221 into a hexagon. It is similar to a "hexagonal pyramid". This is conducive to providing a wider "asymmetry degree" and more diverse "transport channels" to adapt to the "vortex enhanced heat exchange" process in different application scenarios.

[0049] The above implementation modes are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. The understanding of this specification should be based on technical personnel in the relevant technical field. For example, directional descriptions such as "up" and "down" are used. Although this specification has described the present application in detail with reference to the above implementation modes, ordinary technical personnel in the field should understand that technical personnel in the relevant technical field can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A plate heat exchanger (10), comprising a plurality of stacked plates (100), wherein the plurality of plates (100) comprises at least one group of adjacent first plates (101) and second plates (102); the plates (100) have a front side (1001) and a back side (1002) disposed opposite to each other; the front side (1001) of the first plate (101) and the back side (1002) of the second plate (102) are opposite to each other; the first plate (101) and the second plate (102) are both provided with a main heat exchange area (11); ... Any one of the first plate (101) and the second plate (102) has a base plate portion (110) and a plurality of raised portions (111) located in the main heat exchange region (11); the base plate portion (110) is arranged in a plane on both the front side (1001) and the back side (1002) of the corresponding plate (100); the raised portions (111) are raised from the base plate portion (110) on the front side (1001) of the corresponding plate, and the raised portions (111) form recesses (112) relative to the base plate portion (110) on the back side (1002) of the corresponding plate; The substrate portion (110) includes a plurality of intersection portions (12) and a plurality of channel portions (13), wherein the intersection portion (12) is circumferentially distributed with at least three raised portions (111) and at least three channel portions (13); the at least three raised portions (111) and the at least three channel portions (13) are all connected to the intersection portion (12), and each channel portion (13) is located between two adjacent raised portions (111), and the line connecting the points closest to the center of the two adjacent raised portions (111) and the intersection portion (12) coincides with the boundary line between the channel portion (13) and the intersection portion (12); wherein, For the same channel portion (13), the channel portion (13) is connected between two adjacent intersection portions (12) along the first extension direction, the channel portion (13) is connected between two adjacent protrusion portions (111) along the second extension direction, and the maximum dimension of the channel portion (13) along the second extension direction is less than or equal to the dimension of the channel portion (13) along the first extension direction; The raised portion (111) on the front side (1001) of the first plate (101) contacts at least a portion of the channel portion (13) on the back side (1002) of the second plate (102), and the recess (112) formed on the back side (1002) of the second plate (102) by the raised portion (111) of the second plate (102) is arranged relative to at least a portion of the channel portion (13) on the front side (1001) of the first plate (101).

2. The plate heat exchanger (10) according to claim 1, characterized in that The channel portion (13) comprises a first sub-portion (133), a second sub-portion (134), and a third sub-portion (135); the first sub-portion (133) is connected between the second sub-portion (134) and the third sub-portion (135); For the two intersection portions (12) located on both sides of the first extension direction of the channel portion (13), one intersection portion (12) is connected to an end of the second sub-portion (134) away from the first sub-portion (133) along the first extension direction, and the other intersection portion (12) is connected to an end of the third sub-portion (135) away from the first sub-portion (133) along the first extension direction; the second sub-portion (134) and the third sub-portion of the channel portion (13) are equal in size along the first extension direction, and the raised portion (111) on the front side (1001) of the first plate (101) is welded and fixed to the first sub-portion (133) corresponding to the channel portion (13) on the back side (1002) of the second plate (102).

3. The plate heat exchanger (10) according to claim 2, characterized in that The plurality of channel portions (13) include at least one first channel portion (131), wherein a maximum dimension (L4) of a second sub-portion (134) of the first channel portion (131) along a second extension direction of the first channel portion (131) and a maximum dimension (L5) of a third sub-portion (135) along the second extension direction of the first channel portion (131) are both smaller than a maximum dimension (L3) of the first sub-portion (133) along the second extension direction of the first channel portion (131).

4. The plate heat exchanger (10) according to claim 3, characterized in that The first channel portion (131) has a side portion (1311) intersecting with the raised portion (111), the side portion (1311) extending substantially straight at both the second sub-portion (134) and the third sub-portion (135), and the side portion (1311) is in an arc shape at the first sub-portion (133) away from the central axis of the first channel portion (131) along the first extension direction; Alternatively, the side portion (1311) is in the shape of an arc as a whole, away from the central axis of the first channel portion (131) along the first extension direction, and the highest point of the arc is located at the first sub-portion (133).

5. The plate heat exchanger (10) according to claim 1, characterized in that The raised portion (111) has a top (21) and a side wall (22); the top (21) has a flat surface or a slightly curved surface for welding; the side wall (22) is connected between the top (21) and the substrate portion (110); the side wall (22) has an intersection portion (220) connected to the substrate portion (110), and the intersection portion (220) includes a plurality of straight sections (221); the plurality of straight sections (221) respectively intersect with different channel portions (13); and the extension directions of the plurality of straight sections (221) are fitted into a closed polygon.

6. The plate heat exchanger (10) according to claim 5, characterized in that The plurality of straight sections (221) of the intersection portion (220) include a first straight section (301), a second straight section (302), a third straight section (303), and a fourth straight section (304); the extension directions of the four straight sections (221) are fitted into a quadrilateral; The intersection portion (12) is connected to four channel portions (13) respectively; the four channel portions (13) include two second channel portions (136) and two third channel portions (138); the two second channel portions (136) extend from the intersection portion (12) in opposite directions, and the two third channel portions (138) extend from the intersection portion (12) in opposite directions.

7. The plate heat exchanger (10) according to claim 6, characterized in that Two straight sections (221) connected to both sides of the channel portion (13) in the width direction are arranged in parallel; the intersection portion (220) further includes a plurality of transition sections (222), the transition sections (222) are connected between the ends of the extension direction of two adjacent straight sections (221), and the two adjacent straight sections (221) are transitioned through the rounded corners of the transition sections (222).

8. The plate heat exchanger (10) according to claim 7, characterized in that The dimension (L6) of the second channel portion (136) along its second extension direction is greater than the dimension (L7) of the third channel portion (138) along its second extension direction; the recess (112) formed by the raised portion (111) of the second plate (102) on the reverse side (1002) of the second plate (102) is arranged relative to at least a portion of the third channel portion (138) on the front side (1001) of the first plate (101); and the intersection portion (12) on the reverse side (1002) of the second plate (102) is arranged relative to at least a portion of the second channel portion (136) on the front side (1001) of the first plate (101).

9. The plate heat exchanger (10) according to claim 6, characterized in that The projection of the top (21) on a plane perpendicular to the plate stacking direction is an ellipse, a perfect circle, a crescent, or a shape identical to the closed polygon; the side wall (22) between the straight section (221) and the top (21) is roughly a plane inclined to the plate stacking direction.

10. The plate heat exchanger (10) according to claim 7, characterized in that The plurality of straight sections (221) of the intersection (220) include a first straight section (301), a second straight section (302), a third straight section (303), and a fourth straight section (304); the extension directions of the four straight sections (221) are fitted into a quadrilateral; wherein the angle formed by the fitting of the first straight section (301) and the second straight section (302) is recorded as a first angle (β1); the angle formed by the fitting of the third straight section (303) and the fourth straight section (304) is recorded as a second angle (β2); the second straight section The angle formed by fitting the first straight segment (302) and the third straight segment (303) is recorded as the third angle (β3), and the angle formed by fitting the first straight segment (301) and the fourth straight segment (304) is recorded as the fourth angle (β4); the line connecting the corner tip (A) of the first angle (β1) and the corner tip (B) of the second angle (β2) coincides with the length direction (LL) of the plate, and the line connecting the corner tip (C) of the third angle (β3) and the corner tip (D) of the fourth angle (β4) coincides with the width direction (WW) of the plate.

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