Plate Heat Exchanger

Abstract

The plate heat exchanger of the present application includes at least one group of adjacent first and second plates; any of the first and second plates has a base plate portion and a plurality of protrusions located in the main heat exchange area; 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 plate; the base plate portion includes a plurality of intersections and a plurality of channel portions, and the intersection portion has at least three protrusions and at least three channel portions distributed circumferentially; for the same channel portion, the channel portion is connected between two adjacent intersections along the first extension direction, and the channel portion is connected between two adjacent protrusions along the second extension direction; the protrusion on the front side of the first plate contacts at least a portion of the intersection on the back side of the second plate; the pit formed by the protrusion of the second plate on the back side of the second plate is arranged relative to at least a portion of the intersection on the front side 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] In a first aspect, 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 intersection on the back side of the second plate; 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 intersection on the front side of the first plate.

[0008] The protrusions corresponding to the first plate and the second plate of the plate heat exchanger of the present application are both protruding relative to the base plate on the front side of the plate, and the pits formed by the protrusions on the back side of the plate are conducive to the formation of vortices at the pits by the fluid flowing through the back side of the plate to enhance the fluid mixing effect and improve the heat exchange efficiency. The intersection and channel parts 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.

[0009] In a second aspect, 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 plates and second plates; the plates have a front side and a back side disposed opposite to each other; the first plate and the second plate are both provided with a main heat exchange area;

[0010] The first plate has a substrate portion and a plurality of protrusions located in its main heat exchange area; the substrate portion is arranged in a plane on both the front and back surfaces of the first plate; the protrusion protrudes from the substrate portion on the front surface of the first plate, and the protrusion forms a pit relative to the substrate portion on the back surface of the first plate; the substrate portion includes a plurality of intersection portions and a plurality of channel portions, and at least three protrusions and at least three channel portions are distributed circumferentially on the intersection portion; the at least three protrusions and at least three channel portions are all connected to the intersection portion; each channel portion is located between two adjacent protrusions, and the line connecting the points where the two adjacent protrusions 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 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;

[0011] The second plate is provided with a plurality of convex points and a plurality of concave points in its main heat exchange area, wherein the convex points protrude from the concave points on the front side of the second plate; wherein two adjacent convex points are transitioned through a concave first curved surface structure, and two adjacent concave points are transitioned through a convex second curved surface structure, wherein the lowest point of the first curved surface structure is higher than the concave points, and the highest point of the second curved surface structure is lower than the convex points;

[0012] The front side of the first plate is opposite to the back side of the second plate, the convex structure formed by the concave points on the back side of the second plate is in contact with at least a portion of the convex portion of the front side of the first plate, and the concave area formed by the convex points of the second plate on the back side of the second plate is arranged opposite to at least a portion of the intersection portion of the front side of the first plate;

[0013] Alternatively, the back side of the first plate is opposite to the front side of the second plate, the pit formed by the raised portion of the first plate on the back side of the first plate is arranged opposite to the concave point on the front side of the second plate in at least a partial area, and the intersection portion on the back side of the first plate is in contact with the convex point on the front side of the second plate in at least a partial area.

[0014] The raised portion of the first plate of the plate heat exchanger of the present application is raised relative to the base plate portion on the front side of the plate, and the pit formed by the raised portion on the back side of the first plate is conducive to the fluid flowing through the back side of the first plate to form a vortex at the pit to enhance the fluid mixing effect and improve the heat exchange efficiency. The intersection and channel portion connected at the front side of the first 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.

[0015] In a third aspect, 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 plates and second plates; the plates have a front side and a back side disposed opposite to each other; the first plate and the second plate are both provided with a main heat exchange area;

[0016] Any of the first plate and the second plate has a base plate portion and a plurality of raised portions located in the main heat exchange area; the base plate portion is arranged in a plane on the front and back sides of the corresponding plate; the raised portion protrudes from the base plate portion on the front side of the corresponding plate, and the raised portion forms a pit relative to the base plate portion on the back side of the corresponding plate; the raised portion has a top and a side wall; the top has a plane or a slightly curved surface for welding; the side wall is connected between the top and the base plate portion;

[0017] The base plate portion of the first plate has a plurality of intersection portions and a plurality of channel portions, and the intersection portion is circumferentially distributed with at least three protrusions and at least three channel portions; the at least three protrusions and at least three channel portions are all connected to the intersection portion; each channel portion is located between two adjacent protrusions, and the line connecting the points where the two adjacent protrusions 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 the two adjacent intersection portions along the first extension direction, and the channel portion is connected between the side walls of the 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;

[0018] The main heat exchange area of ​​the second plate is further provided with a plurality of connecting parts; the connecting parts protrude from the base plate on the front side of the second plate, the connecting parts are connected between the side walls of two adjacent protruding parts, and the protruding height of the connecting parts relative to the base plate is less than the protruding height of the protruding parts relative to the base plate; the connecting parts form a concave area relative to the base plate on the back side of the second plate, and the concave area connects the pits formed by two adjacent protruding parts on the back side of the plate respectively;

[0019] The front side of the first plate and the back side of the second plate are opposite to each other, the raised portion on the front side of the first plate is in contact with the base plate portion on the back side of the second plate at least partially; the intersection portion on the front side of the first plate and the recess formed by the raised portion of the second plate on the back side of the second plate are arranged opposite to each other at least partially;

[0020] Alternatively, the back side of the first plate is opposite to the front side of the second plate, the recess formed by the raised portion of the first plate on the back side of the first plate is arranged opposite to the base plate portion on the front side of the second plate, and the intersection portion on the back side of the first plate contacts at least part of the top of the raised portion on the front side of the second plate.

[0021] The raised portion of the first plate of the plate heat exchanger of the present application is raised relative to the base plate portion on the front side of the plate, and the pit formed by the raised portion on the back side of the first plate is conducive to the fluid flowing through the back side of the first plate to form a vortex at the pit to enhance the fluid mixing effect and improve the heat exchange efficiency. The intersection and channel portion connected at the front side of the first 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

[0022] Figure 1 It is a structural schematic diagram of the relevant plate involved in the background technology of this application;

[0023] Figure 2It is a structural schematic diagram of a plate heat exchanger provided in this application;

[0024] Figure 3 It is a front structural schematic diagram of a first plate provided by the present application;

[0025] Figure 4 yes Figure 3 A schematic diagram of the reverse structure of the first plate;

[0026] Figure 5 yes Figure 3 A schematic diagram of the partial structure of the front side of the first plate;

[0027] Figure 6 yes Figure 4 A schematic diagram of the local structure of the reverse side of the first plate;

[0028] Figure 7 This is a schematic diagram of an assembly structure of a first plate and a second plate provided in the present application;

[0029] Figure 8 This application Figure 7 Another cross-sectional structural schematic diagram of;

[0030] Fig. 9 This is another schematic diagram of the assembly structure of the first plate and the second plate provided by the present application;

[0031] Fig.10 It is a partial structural schematic diagram of the front side of a first plate provided by the present application;

[0032] FIG11( a ) is a schematic diagram of a simulation result obtained by computer simulation of two types of plates;

[0033] FIG11( b ) is a schematic diagram of another simulation result obtained by computer simulation of two types of plates;

[0034] FIG11( c ) is a schematic diagram of the plate flow characteristics obtained by computer simulation of the plate in the relevant embodiment of the present application;

[0035] Fig.12 is another schematic diagram of the partial structure of the first plate provided by the present application;

[0036] Fig.13 yes Fig.12 Schematic diagram of the cross section of the middle structure along the AA line;

[0037] Fig.14 is a top view schematic diagram of another protrusion structure provided by the present application;

[0038] Fig.15 It is a top view schematic diagram of another protrusion structure provided by the present application;

[0039] Fig.16 It is a partial structural schematic diagram of another front side of the second plate provided by the present application;

[0040] Fig.17 This is another exploded schematic diagram of the local structure of three plates provided in this application. DETAILED DESCRIPTION

[0041] 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.

[0042] 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, and 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.

[0043] The first plate 101 and the second plate 102 are both provided with a main heat exchange area 11. Figure 3 and Figure 4 The 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 substantially 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.

[0044] 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.

[0045] 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 (point O in the example) Figure 5 The line S0 in the figure (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 the 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. For the channel portion 13 located between two adjacent protrusions 111, the maximum spacing between the intersections where the two adjacent protrusions 111 are connected to the channel portion 13 is less than the distance between the center points of the two intersection portions 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 portion 12 and away from the intersection portion 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 extending direction may be a length direction of the channel portion 13 , and the second extending direction may be a width direction of the channel portion 13 .

[0046] 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.

[0047] 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.

[0048] 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.

[0049] In some embodiments, 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 similar to a closed polygon. For example, the top 21 may be an elongated rhombus. The side wall 22 between the straight section 221 and the top 21 is generally a plane inclined to the plate stacking direction. 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.

[0050] refer to Figure 7 , Figure 8 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 intersection 12 on the back side 1002 of the second plate 12, and the pit 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 intersection 12 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.

[0051] 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 5As 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 are conducive to forming a relatively smooth flow channel structure for the fluid converging to the intersections 12. 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 an arrow in the middle indicates that the layout of the protrusion 111 is conducive to Figure 6 The 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 side of the upper plate, and the relatively open channel structure of the lower plate transports the heat extracted from the "vortex". The upper and lower plates are conducive to establishing a "convective heat transfer" mechanism between adjacent plates, and constructing a physical mechanism of vortex-enhanced convective heat transfer, that is, the generation-development-suction-stripping of the "vortex" completes the transfer and transportation of heat. This innovative heat exchange structure of the plate is conducive to the plate heat exchanger to obtain better heat exchange performance.

[0052] The first plate 101 and the second plate 102 can be plates of exactly the same size and shape, so they can be manufactured 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 beneficial to reducing the plate manufacturing and management costs. Figure 8 , the height of the protrusion 111 of the first plate 101 relative to the substrate 110 of the first plate 101 is equal to the height of the protrusion 111 of the second plate 102 relative to the substrate 110 of the second plate 102. Of course, in some other embodiments, the heights of the two may be different, so the plates may also be made by molds with different processing parameters, refer to Fig. 9 As shown, the height of the protrusion 111 of the first plate 101 relative to the substrate 110 of the first plate 101 is greater than the height of the protrusion 111 of the second plate 102 relative to the substrate 110 of the second plate 102. In some application scenarios, 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 "eddy current" to extract heat and the heat transport ability of the fluid can be adjusted to meet different heat exchange performance requirements.

[0053] In some embodiments, reference Fig.10As 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.

[0054] 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.

[0055] 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.

[0056] Referring to FIG. 11(a), FIG. 11(b) and FIG. 11(c), the present application provides a main heat exchange zone as follows: Fig.10 The illustrated point wave type plate (the reference object of label 2 in Figure 11 (a) and Figure 11 (b)) is tested and simulated for comparison. Among them, the main heat exchange area of ​​the heat exchange plate of "other plates" is provided with a plurality of concave and convex parts, and the adjacent concave parts are connected by an upward convex curved surface transition, the highest point of the upward convex curved surface is lower than the convex part, and the adjacent convex parts are connected by a downward concave curved surface transition, and the lowest point of the downward concave curved surface is higher than the concave part.

[0057] Under the same test conditions (such as plate material thickness, main heat exchange area area, overall plate size, density of protrusions, area of ​​protrusions used for welding with adjacent plates, other areas outside the main heat exchange area, etc.), the computer simulation results provided in this application calculate the heat transfer parameters and pressure drop parameters corresponding to the fluid. The heat transfer performance is calculated by multiplying the overall heat transfer coefficient and the heat transfer area, which is equivalent to the heat transfer amount / heat transfer temperature difference. The flow resistance performance uses ethylene glycol as the working fluid to calculate the pressure drop of the working fluid in the plate channel. The calculation results are shown in Figure 11 (a) and Figure 11 (b). In terms of technical effect, the heat transfer performance of this application is improved by about 17% compared with the "ordinary plate", and the pressure drop is reduced by about 21%. It has significant technical advantages under the same benchmarking environment.

[0058] FIG. 11( c ) is a diagram provided by the present application. Fig.10 The fluid flow field characteristics simulated by the computer simulation software corresponding to the illustrated plate. In the pit formed by the raised portion 111 on the reverse side of the upper plate, the flow field distribution lines are relatively sparse and have a large degree of bending and kinking, the fluid movement speed is slow, and the fluid is easy to form a "vortex". On the front side of the lower plate, the flow field distribution lines are relatively dense and gentle, and the connected intersection and channel parts have a relatively open channel structure, and the fluid flows faster, so it is easier to transport heat away.

[0059] refer to Fig.12 and Fig.13 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 β2 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.

[0060] 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.12As 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.

[0061] The closed polygon fitted in the extension direction of the plurality of straight sections 221 of the intersection 220 may be a triangle or a hexagon in addition to a quadrilateral, and even two or more convex portions 111 may be provided in the same plate. Fig.14 , Fig.15 As shown, some embodiments of the present application provide protrusions 111 of other shapes. Fig.13 The raised portion 111 is shown schematically by fitting its straight section 221 into a hexagon. Fig.15 The raised portion 111 is shown schematically with its straight section 221 fitted as a triangle. For the adjacent first plate 101 and the second plate 102, one of the two plates may be provided with, for example Fig.14 The convex part 111 of the type similar to the "hexagonal pyramid" shown in the figure can be provided with, for example, Fig.15 The convex part 111 of the type similar to a "triangular pyramid" is shown. Of course, both plates can also be provided with, for example Fig.14 The convex part 111 shown is similar to the "hexagonal pyramid" type. This "triangle" and "hexagon" method will provide a wider "asymmetry degree" and more diverse "transport channels" to adapt to the "vortex enhanced heat exchange" process in different application scenarios.

[0062] Based on the same inventive concept, in other embodiments of the present application, the first plate 101 and the second plate 102 are plates with different heat exchange structural forms. The first plate 101 is as in the aforementioned embodiment. The first plate 101 has a substrate portion 110 and a plurality of protrusions 111 located in its main heat exchange area 11. 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. The protrusions 111 form a recess 112 relative to the substrate portion 110 on the back side 1001 of the first plate 101. The substrate portion 110 includes a plurality of intersections 12, each of which has at least three protrusions 111 around it. The substrate portion 110 also has a plurality of channel portions 13, and the channel portion 13 has an elongated shape extending from the intersection 12 to a direction away from the intersection 12. Each channel portion 13 is located between two adjacent protrusions 111, and the two adjacent protrusions 111 are respectively adjacent to the center of the intersection 12 (with a protrusion 111 at the center of the protrusion 111). Figure 5 The line between the points closest to each other (point O in the example) 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. And for the same channel portion 13, the channel portion 13 is connected between the two intersection portions 12 along its first extension direction, i.e., the length direction, and the channel portion 13 is connected between the side walls 22 of the two adjacent protrusions 111 along its second extension direction, i.e., the width direction. 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 structure of the first plate 101 can refer to the aforementioned Figures 2 to 15 The plate structure shown.

[0063] refer to Fig.16 The main heat exchange area 11 of the second plate 102 is provided with a plurality of connecting portions 131, the connecting portions 131 protrude from the substrate portion 110 on the front side of the first plate 101, the connecting portions 131 are connected between the side walls 22 of two adjacent protruding portions 111, the connecting portions 131 form a recessed area on the reverse side 1001 of the second plate 102 relative to the substrate portion 110, the recessed area connects the pits 112 respectively formed by the two adjacent protruding portions 111 on the reverse side 1001 of the second plate 102, and the protruding height of the connecting portions 131 relative to the substrate portion 110 is less than the protruding height of the protruding portions 111 relative to the substrate portion 110. Thus, for the second plate 102 provided with the connecting portion 131, the volume size of the front side 1001 of the second plate 102 and the back side 1002 of the second plate 102 can be adjusted by setting different heights of the substrate portion 110, thereby achieving the same channel volume or different channel volumes on the front and back sides of the second plate 102, so as to achieve symmetrical or asymmetrical flow channel settings and meet the needs of product diversification. The ratio between the ability of the fluid to generate "eddy current" to extract heat and the heat transport ability of the fluid is adjusted to meet the requirements of different heat exchange performances.

[0064] When the first plate 101 and the second plate 102 are assembled, there are two situations. In one situation, 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 raised portion 111 of the front side 1001 of the first plate 101 is in contact with the substrate portion 110 of the back side 1002 of the second plate 102 in at least a partial area, and the intersection portion 12 of the front side 1001 of the first plate 101 and the recessed portion 112 formed by the raised portion 111 of the second plate 102 in at least a partial area on the back side 1002 of the second plate 102 are arranged relative to each other.

[0065] Alternatively, in another case, the back side 1002 of the first plate 101 is opposite to the front side 1001 of the second plate 102, the pit 112 formed by the raised portion 111 of the first plate 101 on the back side 1002 of the first plate 101 is arranged opposite to the substrate portion 110 of the front side 1001 of the second plate 102, and the intersection portion 12 of the back side 1002 of the first plate 101 is in contact with at least a partial area of ​​the top 21 of the raised portion 111 of the front side 1001 of the second plate 102.

[0066] In other embodiments of the present application, the multiple plates 100 of the plate heat exchanger 10, in addition to the first plate 101 and the second plate 102 provided in the aforementioned embodiment, may also include other types of plates under the condition that the assembly is met, such as a plate with a herringbone wave type corrugated structure in the main heat exchange zone 11, or a plate with a complex curved surface structure as mentioned in the background technology of the present application.

[0067] Thus, based on the same inventive concept, other embodiments of the present application further provide a plate heat exchanger 10, comprising a plurality of stacked plates 100, wherein the plurality of plates 100 include at least one group of adjacent first plates 101 and second plates 102. The plates 100 are provided with a main heat exchange area 11.

[0068] The first plate 101 has a substrate portion 110 and a plurality of protrusions 111 located in its main heat exchange area 11, 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, the protrusions 111 form a recess 112 relative to the substrate portion 110 on the back side 1001 of the first plate 101, the substrate portion 110 includes a plurality of intersections 12, the intersections 12 are surrounded by at least three protrusions 111, the substrate portion 110 further has a plurality of channel portions 13, the channel portions 13 have an elongated shape extending in a direction away from the intersections 12, each channel portion 13 is located between two adjacent protrusions 111, the two adjacent protrusions 111 are respectively adjacent to the center of the intersection 12 (with Figure 5 The line between the points closest to each other (point O in the example) 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. The channel portion 13 has an elongated shape extending from the intersection portion 12 to a direction away from the intersection portion 12, and for the same channel portion 13, the channel portion 13 is connected between the two intersection portions 12 along its first extension direction, i.e., the length direction, and the channel portion 13 is connected between two adjacent protrusions 111 along its second extension direction, i.e., the width direction. 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 structure of the first plate 101 can refer to the aforementioned Figures 2 to 15 The plate structure shown.

[0069] refer to Fig.17 The second plate 102 is provided with a plurality of convex points 115 and a plurality of concave points 116 in its main heat exchange area 11, the convex points 115 protrude relative to the concave points 116 on the front side 1001 of the second plate 102, wherein two adjacent convex points 115 are transitioned through a concave first curved surface structure 117, and two adjacent concave points 116 are transitioned through a convex second curved surface structure 118, the lowest point P1 of the first curved surface structure 117 is higher than the concave points 116, and the highest point P2 of the second curved surface structure 118 is lower than the convex points 115. In some embodiments, the lowest point P1 of the first curved surface structure 117 and the highest point P2 of the second curved surface structure 118 may coincide.

[0070] When the first plate 101 and the second plate 102 are assembled, there are two situations. In one situation, the front side 1001 of the first plate 101 and the back side 1002 of the second plate 102 are opposite to each other, and the raised portion 111 on the front side of the first plate 101 and the recessed point 116 on the second plate 102 form a raised structure on the back side 1002 of the second plate 102 in contact with at least a partial area, and the intersection portion 12 on the front side 1001 of the first plate 101 and the recessed point 115 on the back side 1002 of the second plate 102 are arranged relative to each other at least a partial area.

[0071] Alternatively, in the second case, the back side 1002 of the first plate 101 is opposite to the front side 1001 of the second plate 101, the pit 112 formed by the raised portion 111 of the first plate 101 on the back side 1002 of the first plate 101 and the concave point 116 on the front side 1001 of the second plate 102 are arranged opposite to each other in at least a partial area, and the intersection portion 12 of the back side 1002 of the first plate 101 is in contact with at least a partial area of ​​the convex point 115 on the front side 1001 of the second plate 102.

[0072] 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), the plurality of plates (100) comprising at least one group of adjacent first plates (101) and second plates (102); the plates (100) having a front side (1001) and a back side (1002) disposed opposite to each other; the first plates (101) and the second plates (102) are both provided with a main heat exchange area (11); Each plate has a base plate portion (110) and a plurality of raised portions (111) located in a 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 a recess (112) relative to the base plate portion (110) on the back side (1002) of the corresponding plate; The base plate portion (110) comprises a plurality of intersection portions (12) and a plurality of channel portions (13); the intersection portion (12) is circumferentially provided with at least three raised portions (111) and at least three channel portions (13); the at least three raised portions (111) and at least three channel portions (13) are all connected to the intersection portion (12); each channel portion (13) is located between two adjacent raised portions (111); a line connecting the points of the two adjacent raised portions (111) that are closest to the center of the intersection portion (12) coincides with a 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 a first extension direction, the channel portion (13) is connected between two adjacent protruding portions (111) along a 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 front side (1001) of the first plate (101) and the back side (1002) of the second plate (102) are opposite to each other; the raised portion (111) of the front side (1001) of the first plate (101) is in contact with at least a partial area of ​​the intersection portion (12) of the back side (1002) of the second plate (102); and the recess (112) formed by the raised portion (111) of the second plate (102) on the back side (1002) of the second plate (102) is arranged opposite to at least a partial area of ​​the intersection portion (12) of the front side (1001) of the first plate (101).

2. The plate heat exchanger (10) according to claim 1, characterized in that: The raised portion (111) comprises a top (21) and a side wall (22); the top (21) comprises a plane 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) comprises an intersection portion (220) connected to the substrate portion (110); the intersection portion (220) comprises 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.

3. The plate heat exchanger (10) according to claim 2, characterized in that: Two straight sections (221) respectively connected to the two sides of the second extension direction of the channel portion (13) are arranged in parallel; the intersection portion (220) further comprises a plurality of transition sections (222), the transition sections (222) being connected between the ends of two adjacent straight sections (221) in the extension direction, and the two adjacent straight sections (221) are transitioned through rounded corners via the transition sections (222).

4. The plate heat exchanger (10) according to claim 2, 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 generally a plane inclined to the plate stacking direction.

5. The plate heat exchanger (10) according to claim 2, characterized in that: A height of the protruding portion (111) of the first plate (101) relative to the base plate portion (110) of the first plate (101) is not equal to a height of the protruding portion (111) of the second plate (102) relative to the base plate portion (110) of the second plate (102).

6. The plate heat exchanger (10) according to claim 3, characterized in that: The first extension direction of each channel portion (13) connected to the intersection portion (12) is arranged to be inclined relative to the length direction (LL) of the plate.

7. The plate heat exchanger (10) according to claim 6, 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 section (302) and the third straight section (303) is recorded as the third angle (β3), and the angle formed by fitting the first straight section (301) and the fourth straight section (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.

8. The plate heat exchanger (10) according to claim 7, characterized in that: The plurality of protrusions (111) include a plurality of first protrusions (113); at least some of the first protrusions (113) are distributed on the edge of the main heat exchange area (11); the tip (B) of the second angle (β2) of the first protrusion (113) is closer to the edge (S1) in the plate width direction (WW) than the 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); The transition section (222) between the first straight section (301) and the second straight section (302) is recorded as the first transition section (401); 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) comprises 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); the inclination angle of the first side wall (51) relative to a plane perpendicular to the stacking direction of the plates is greater than the inclination angle of the second side wall (52) relative to a plane perpendicular to the stacking direction of the plates.

9. The plate heat exchanger (10) according to claim 2, characterized in that: The closed polygon fitted by the extension direction of the plurality of straight sections (221) of the intersection (220) is a triangle, a quadrilateral or a hexagon.

10. A plate heat exchanger (10), comprising a plurality of stacked plates (100), the plurality of plates (100) comprising at least one group of adjacent first plates (101) and second plates (102); the plate (100) having a front side (1001) and a back side (1002) disposed opposite to each other; the first plate (101) and the second plate (102) are both provided with a main heat exchange area (11); The first plate (101) comprises a base plate portion (110) and a plurality of protrusions (111) located in the main heat exchange area (11) thereof; the base plate portion (110) is arranged in a plane on both the front side (1001) and the back side (1002) of the first plate (101); the protrusions (111) protrude from the base plate portion (110) on the front side (1001) of the first plate (101), and the protrusions (111) form recesses (112) relative to the base plate portion (110) on the back side (1002) of the first plate (101); the base plate portion (110) is provided with a plurality of protrusions (111) on the back side (1002) of the first plate (101); 0) comprises a plurality of intersections (12) and a plurality of channel portions (13), wherein the intersection (12) is circumferentially provided 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 (12); each channel portion (13) is located between two adjacent raised portions (111), and a line connecting the points at which the two adjacent raised portions (111) are closest to the center of the intersection (12) coincides with a boundary line between the channel portion (13) and the intersection (12); wherein: For the same channel portion (13), the channel portion (13) is connected between two adjacent intersection portions (12) along a first extension direction, the channel portion (13) is connected between two adjacent protruding portions (111) along a 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 second plate (102) is provided with a plurality of convex points (115) and a plurality of concave points (116) in its main heat exchange region (11), wherein the convex points (115) protrude from the concave points (116) on the front side (1001) of the second plate (102); wherein two adjacent convex points (115) are transitioned through a concave first curved surface structure (117), and two adjacent concave points (116) are transitioned through a convex second curved surface structure (118), wherein the lowest point (P1) of the first curved surface structure (117) is higher than the concave points (116), and the highest point (P2) of the second curved surface structure (118) is lower than the convex points (115); 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 convex structure formed by the concave point (116) of the second plate (102) on the back side (1002) of the second plate (102) contacts at least a part of the convex part (111) of the front side (1001) of the first plate (101), and the concave structure formed by the convex point (115) of the second plate (102) on the back side (1002) of the second plate (102) is arranged opposite to at least a part of the intersection part (12) of the front side (1001) of the first plate (101); Alternatively, the back surface (1002) of the first plate (101) is opposite to the front surface (1001) of the second plate (102), the concave pit (112) formed by the raised portion (111) of the first plate (101) on the back surface (1002) of the first plate (101) is arranged opposite to at least a portion of the concave point (116) on the front surface (1001) of the second plate (102), and the intersection portion (12) of the back surface (1002) of the first plate (101) is in contact with at least a portion of the raised point (115) on the front surface (1001) of the second plate (102).

11. A plate heat exchanger (10), comprising a plurality of stacked plates (100), the plurality of plates (100) comprising at least one group of adjacent first plates (101) and second plates (102); the plate (100) having a front side (1001) and a back side (1002) disposed opposite to each other; the first plate (101) and the second plate (102) are both provided with a main heat exchange area (11); Any of the first plate (101) and the second plate (102) comprises a base plate portion (110) and a plurality of raised portions (111) located in the main heat exchange area (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 portion (111) protrudes from the base plate portion (110) on the front side (1001) of the corresponding plate, and the raised portion (111) forms a recess (112) relative to the base plate portion (110) on the back side (1002) of the corresponding plate; the raised portion (111) comprises a top portion (21) and a side wall (22); the top portion (21) comprises a plane or a slightly curved surface for welding; the side wall (22) is connected between the top portion (21) and the base plate portion (110); The base plate portion (110) of the first plate (101) comprises a plurality of intersection portions (12) and a plurality of channel portions (13); the intersection portion (12) is circumferentially provided with at least three protruding portions (111) and at least three channel portions (13); the at least three protruding portions (111) and the at least three channel portions (13) are all connected to the intersection portion (12); each channel portion (13) is located between two adjacent protruding portions (111); a line connecting the points of the two adjacent protruding portions (111) that are closest to the center of the intersection portion (12) coincides with a 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 a first extension direction, the channel portion (13) is connected between the side walls (22) of two adjacent protruding portions (111) along a 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 main heat exchange area (11) of the second plate (102) is further provided with a plurality of connecting portions (131); the connecting portions (131) protrude from the base plate portion (110) on the front surface (1001) of the second plate (102); the connecting portions (131) are connected between the side walls (22) of two adjacent protruding portions (111); and the protruding height of the connecting portions (131) relative to the base plate portion (110) is less than the protruding height of the protruding portions (111) relative to the base plate portion (110); the connecting portions (131) form a recessed area on the back surface (1002) of the second plate relative to the base plate portion (110); the recessed area connects the recessed pits (112) respectively formed by two adjacent protruding portions (111) on the back surface (1002) of the plate (100); The front side (1001) of the first plate (101) and the back side (1002) of the second plate (102) are opposite to each other, and the raised portion (111) of the front side (1001) of the first plate (101) is in contact with at least a partial area of ​​the base plate portion (110) of the back side (1002) of the second plate (102); the intersection portion (12) of the front side (1001) of the first plate (101) and the recess (112) formed by the raised portion (111) of the second plate (102) on the back side (1002) of the second plate (102) are arranged opposite to each other at least a partial area; Alternatively, the back surface (1002) of the first plate (101) is opposite to the front surface (1001) of the second plate (102), the recess (112) formed by the raised portion (111) of the first plate (101) on the back surface (1002) of the first plate (101) is arranged opposite to the base plate portion (110) of the front surface (1001) of the second plate (102), and the intersection portion (12) of the back surface (1002) of the first plate (101) is in contact with at least a portion of the top portion (21) of the raised portion (111) of the front surface (1001) of the second plate (102).

Images