Heat exchange plate and heat exchange unit

Abstract

The utility model provides a kind of heat exchange plate and heat exchange unit, belong to heat transfer technical field.It solves the technical problems such as poor adjustment ability, weak heat exchange effect of prior art.This kind of heat exchange plate, including plate body, the plate body is equipped with at least two rows of wave point protruding array along transverse distribution, two rows of wave point protruding array form main flow channel between, the wave point protruding array includes several wave point protrusions with arc section A along longitudinal array distribution, and it is equipped with resistance structure between two wave point protrusions of transverse adjacent, it is equipped with flow guide structure between two wave point protrusions of longitudinal adjacent and belonging to different wave point protruding array.The utility model has the advantages such as strong heat exchange effect, good fluid uniformity, good quality etc.

Description

Technical Field

[0001] This utility model belongs to the field of heat transfer technology, and relates to heat exchange devices, and in particular to a heat exchange plate and a heat exchange unit. Background Technology

[0002] A heat exchange plate is a heat exchange element made of metal plates. It achieves efficient heat transfer through the flow of refrigerant between the plates, used for heat exchange between different media. In existing technologies, the flow of the main and secondary fluids is typically adjusted by regulating the size and spacing of crescent or fish-scale-shaped corrugations. The space between two adjacent crescent or fish-scale corrugations is a freely formed, free-flowing transition surface. The crescent or fish-scale corrugations are arranged vertically or horizontally. Because the size and spacing of the crescent or fish-scale corrugations are strongly coupled with the corrugation depth and are limited by the material's tensile strength, independent control and adjustment are difficult. This limits the flow, formation, and control of the main and secondary fluids, thus restricting the adjustment capability and consequently limiting the heat exchange effect. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a heat exchange plate with a stronger heat exchange effect.

[0004] Another objective of this invention is to provide a heat exchange unit that addresses the aforementioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A heat exchange plate includes a plate body, on which at least two rows of wave-shaped protrusion arrays distributed laterally are provided, and a main channel is formed between the two rows of wave-shaped protrusion arrays. The wave-shaped protrusion array includes a number of wave-shaped protrusions distributed longitudinally and having an arc-shaped cross section A. A blocking structure is provided between two adjacent wave-shaped protrusions laterally, and a flow-guiding structure is provided between two adjacent wave-shaped protrusions belonging to different wave-shaped protrusion arrays longitudinally.

[0006] By using a forced-formed curved surface instead of a freely stretched curved surface through a flow-guiding and obstruction structure, the direction and magnitude of fluid flow can be flexibly adjusted as needed, thereby controlling the direction and magnitude of the main flow and the secondary flow separately. This improves the distribution of flow within the plate and enhances the regulating capability.

[0007] In the aforementioned heat exchange plate, the dotted protrusion array comprises at least three longitudinally distributed dotted protrusions with an arc-shaped cross-section. The obstruction structure between two laterally adjacent dotted protrusions is replaced by a flow-guiding structure. Replacing the obstruction structure with a flow-guiding structure allows fluid to be guided more smoothly through the lateral gaps at specific locations, reducing unnecessary flow resistance and significantly lowering the overall pressure drop. Furthermore, it prevents the formation of dead zones or backflow of fluid near the obstruction structure.

[0008] In the aforementioned heat exchange plate, the plate body is provided with at least three rows of transversely distributed dotted protrusions, and the flow-guiding structure between two longitudinally adjacent dotted protrusions is replaced by a blocking structure. Replacing the flow-guiding structure with a blocking structure in some locations can force the fluid to decelerate and generate local eddies, disrupting the boundary layer and significantly improving local heat transfer efficiency. Furthermore, by replacing part of the flow-guiding structure, the blocking structure can force the fluid to redistribute, guiding more fluid into the transverse gaps or recessed areas, improving flow field uniformity, and avoiding local overheating or heat transfer dead zones.

[0009] In the aforementioned heat exchange plate, the wave-shaped protrusions of adjacent rows of wave-shaped protrusions are staggered longitudinally. This longitudinal misalignment forces the fluid to repeatedly deflect within the main flow channel, causing the fluid to impact the staggered protrusions and diffuse laterally into the gaps on both sides, thus increasing the plate's surface coverage. Furthermore, the staggered structure breaks down large-scale eddies into multi-directional smaller eddies, increasing the turbulent kinetic energy density.

[0010] In the heat exchange plate described above, the straight-line distance between the centers of any two adjacent wave-shaped protrusions is equal. This equidistant arrangement provides a standardized positioning reference for the flow-guiding and flow-retarding structures, ensuring a consistent flow cross-sectional area for the fluid in all regions of the plate and avoiding sudden changes in local flow velocity caused by uneven protrusion spacing.

[0011] In the aforementioned heat exchange plate, the main flow channel is provided with several longitudinally spaced depressions. These depressions are located between four adjacent wave-shaped protrusions and are connected to two flow-guiding structures and two flow-blocking structures that link the four wave-shaped protrusions. The depression formed at the center of the rectangular area formed by the four wave-shaped protrusions generates a low-pressure adsorption effect when the fluid flows through it. After the fluid accelerates on the protruding surface, it decelerates in the depression area, spontaneously generating eddies due to fluid inertia. This enhances the heat transfer effect while having minimal impact on pressure drop.

[0012] In the heat exchange plate described above, the blocking structure is located between two adjacent transversely adjacent convex ends, and the guiding structure is located between two adjacent transversely adjacent convex ends. The blocking structure and the guiding structure are located between the ends, which can block the path of fluid escaping along the edge of the plate, force the fluid to concentrate in the middle of the plate, actively guide the edge fluid to the concave area, and enhance the flow velocity in the center of the main channel.

[0013] Alternatively, the obstruction structure is located between the ends of two adjacent transversely adjacent wave-shaped protrusions, and the drainage structure is located between the middle portions of two adjacent transversely adjacent wave-shaped protrusions. The drainage structure, positioned between the middle portions, can guide high-speed fluid to vertically impact the center of the concave area, generating a more intense rotating vortex.

[0014] In the aforementioned heat exchange plate, the cross-sectional area of ​​the recessed region gradually increases from its bottom to its top surface, and the cross-sectional area of ​​the dotted protrusions gradually increases from their top to their bottom surface. The recessed region adopts an inverted conical expansion cross-section design, allowing the narrow area at its bottom to accelerate the fluid, increase shear force to disrupt the boundary layer, and the wide area at its top to trigger low-pressure adsorption, facilitating the formation of eddies. The dotted protrusions adopt a positive conical cross-section design, which allows the fluid to be naturally guided to the side drainage and hindrance structures, reducing the wake region and thus reducing pressure drop.

[0015] In the heat exchange plate described above, the retardation structure includes a shaped retardation surface with a cross-section B that is arc-shaped or planar. The described drainage structure includes a shaped drainage concave surface with a cross-section C that is either arc-shaped or planar. The arc-shaped structure design allows for a natural transition between gradual cross-sections, eliminating flow separation points. The planar structure design enhances disturbance at the transition points of the gradual cross-section, thereby improving boundary layer resetting efficiency.

[0016] In the aforementioned heat exchange plate, the top surface of the dotted protrusions can be either flat or inclined. A flat top surface design allows the fluid to vertically impact and form a stagnation high-pressure zone, while simultaneously scattering the fluid to the drainage / retention structure. An inclined top surface design allows the fluid to accelerate and slide along the inclined surface after impact, and the low shear force helps maintain the stability of the laminar sublayer.

[0017] In the heat exchange plate described above, the depth H1 of the retardation structure is 0.5-1.5 times the depth H2 of the dotted protrusion. The depth H3 of the flow-guiding structure is 0.5-1.5 times the depth H2 of the dotted protrusion. A design ratio close to 0.5 ensures the structure has basic functionality while minimizing flow resistance. A design ratio close to 1.5 prevents excessive depth from causing severe flow separation and dead zones.

[0018] This heat exchange unit includes two heat exchange plates as described above, with a channel formed between the two heat exchange plates. The two heat exchange plates are connected by dotted protrusions, and the dotted protrusions of the two heat exchange plates are symmetrically arranged. The cross-sectional areas of the two connected dotted protrusions may be the same or different. Alternatively, the dotted protrusions of the two heat exchange plates can be flipped symmetrically, and the cross-sectional areas of the two connected dotted protrusions can be the same or different.

[0019] By symmetrically arranging or mirror-overlapping the raised dots, X-shaped or raised dot top surface solder joints can be formed. This avoids problems such as excessively large solder joints and insufficient disturbance, while simultaneously enhancing both co-current and counter-current flow.

[0020] Compared with existing technologies, the advantages of this heat exchange plate and heat exchange unit are: 1. Increased lateral fluid flow, resulting in higher fluid distribution uniformity within the plate and full utilization of the plate's heat exchange area. 2. Increased disturbance in the secondary fluid direction, leading to stronger heat exchange effect. 3. Effective utilization of flow kinetic energy loss. 4. Avoidance of plate deformation problems, facilitating plate stacking and improving plate quality. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the heat exchange plate structure provided by this utility model.

[0022] Figure 2 This is a schematic diagram of the reverse side structure of the plate provided by this utility model.

[0023] Figure 3 This is a schematic diagram of the front structure of the plate provided by this utility model.

[0024] Figure 4 This utility model provides Figure 3 A schematic diagram of the cross-sectional structure of the wavy dot protrusion at point HH.

[0025] Figure 5 This utility model provides Figure 3 Schematic diagram of the cross-sectional structure of the retardation structure at the FF point.

[0026] Figure 6 This utility model provides Figure 3 Schematic diagram of the cross-sectional structure of the drainage structure at the GG point.

[0027] Figure 7 This utility model provides Figure 4 A schematic diagram of the cross-sectional structure of the top of the dotted protrusion at the EE point.

[0028] Figure 8 This is a schematic diagram of the heat exchange unit structure provided by this utility model.

[0029] Figure 9 This is a schematic diagram of the structure of Embodiment 2 provided by this utility model.

[0030] Figure 10 This is a schematic diagram of the structure of Embodiment 3 provided by this utility model.

[0031] Figure 11 This is a schematic diagram of the structure of Embodiment 4 provided by this utility model.

[0032] Figure 12 This is a schematic diagram of the structure of Embodiment 5 provided by this utility model.

[0033] Figure 13 This is a cross-sectional structural diagram of Embodiment Six provided by this utility model.

[0034] Figure 14 This is a frontal perspective structural diagram of Embodiment Seven provided by this utility model.

[0035] Figure 15 This is a cross-sectional structural diagram of Embodiment Seven provided by this utility model.

[0036] In the figure, 1 is plate, 2 is dotted protrusion array, 21 is dotted protrusion, 3 is main channel, 31 is recessed, 4 is obstruction structure, 41 is formed obstruction surface, 5 is flow guiding structure, 51 is formed flow guiding concave surface, and 6 is heat exchange plate. Detailed Implementation Example 1

[0037] like Figures 1 to 8 As shown, a heat exchange plate includes a plate body 1. The plate body 1 is provided with at least two rows of wave-shaped protrusion arrays 2 distributed laterally. A main channel 3 is formed between the two rows of wave-shaped protrusion arrays 2. The wave-shaped protrusion array 2 includes a number of wave-shaped protrusions 21 distributed longitudinally and having an arc-shaped cross section A. A blocking structure 4 is provided between two adjacent wave-shaped protrusions 21 laterally, and a flow-guiding structure 5 is provided between two adjacent wave-shaped protrusions 21 belonging to different wave-shaped protrusion arrays 2 in the longitudinal direction.

[0038] In this embodiment, by designing the blocking structure 4 and the diversion structure 5, the directions of the main flow fluid and the secondary flow fluid are controlled respectively while maintaining a low system resistance. This allows for convenient adjustment of the direction and magnitude of fluid flow, thereby optimizing fluid distribution and enhancing heat exchange stability and efficiency.

[0039] like Figure 2 As shown, the dot protrusion 21, the main channel 3, the blocking structure 4 and the drainage structure 5 are located on the same surface, while the opposite side of the plate 1 forms a structure that is opposite to the dot protrusion 21, the main channel 3, the blocking structure 4 and the drainage structure 5.

[0040] More specifically, the dot protrusions 21 of two adjacent rows of dot protrusion array 2 are staggered longitudinally. The straight-line distance between the centers of any two adjacent dot protrusions 21 is equal.

[0041] In this embodiment, the central axis of the dotted protrusion 21 is inclined to the central axis of the dotted protrusion array 2. The left end point of the dotted protrusion 21 is higher than the right end point relative to the central axis of the dotted protrusion array 2.

[0042] More specifically, the main channel 3 is provided with a number of recesses 31 that are spaced apart along the longitudinal direction. The recesses 31 are located between four adjacent wave point protrusions 21. The recesses 31 are also connected to two drainage structures 5 and two blocking structures 4 that connect the four wave point protrusions 21.

[0043] More specifically, the blocking structure 4 is located between the ends of two adjacent lateral dot protrusions 21, and the drainage structure 5 is located between the ends of two adjacent longitudinal dot protrusions 21.

[0044] like Figure 4 As shown, the cross-sectional area of ​​the depression 31 gradually increases from its bottom surface to its top surface, and the cross-sectional area of ​​the dotted protrusion 21 gradually increases from its top surface to its bottom surface.

[0045] like Figure 5 and 6 As shown, the blocking structure 4 includes a shaped blocking surface 41 with an arc-shaped cross section B; The drainage structure 5 includes a shaped drainage concave surface 51 with an arc-shaped cross section C.

[0046] More specifically, the top surface of the dotted protrusion 21 is a plane.

[0047] like Figure 4 As shown, the depth H1 of the blocking structure 4 is 1 time the depth H2 of the dotted protrusion 21. The depth H3 of the drainage structure 5 is 0.5 times the depth H2 of the dotted protrusion 21.

[0048] like Figure 8 As shown, a heat exchange unit includes two heat exchange plates 6 as described above, with a channel formed between the two heat exchange plates 6. The two heat exchange plates 6 are connected by dotted protrusions 21, and the dotted protrusions 21 of the two heat exchange plates 6 are symmetrically arranged. The cross-sectional areas of the two connected dotted protrusions 21 are the same. Example 2

[0049] This embodiment is basically the same as embodiment one, except that, as follows: Figure 9 As shown, the central axis of the dotted protrusion 21 is inclined to the central axis of the dotted protrusion array 2. The right end of the dotted protrusion 21 is higher than the left end relative to the central axis of the dotted protrusion array 2.

[0050] In this embodiment, the inclined surface of the dotted protrusion 21, where the right end is higher than the left end, forces the fluid to detach directionally behind the protrusion, generating a more directional and concentrated vortex. This vortex can more effectively scour the downstream obstruction structure 4 and the diversion structure 5 region, improving local heat exchange efficiency. Example 3

[0051] This embodiment is basically the same as embodiment one, except that, as follows: Figure 10 As shown, the central axis of the dotted protrusion 21 is parallel to the central axis of the dotted protrusion array 2. The drainage structure 5 is located between the middle of two longitudinally adjacent dotted protrusions 21.

[0052] In this embodiment, the parallel dotted protrusions 21 reduce the additional energy loss caused by the lateral deflection of the fluid. The centrally located drainage structure 4 provides a shorter and more direct streamline path from the stagnation point on the top surface of the dotted protrusions 21 to the drainage concave surface 51 and the recessed area 31, thereby helping to reduce the overall flow resistance. Example 4

[0053] This embodiment is basically the same as embodiment one, except that, as follows: Figure 11 As shown, the central axis of the dotted protrusion 21 is parallel to the central axis of the dotted protrusion array 2. The drainage structure 5 is located between the middle of two adjacent dotted protrusions 21 in the longitudinal direction. Furthermore, the blocking structure 4 includes a shaped blocking surface 41 with a planar cross-section B, and the shaped blocking surface 41 is integrated with the top surface of the dotted protrusion 21.

[0054] In this embodiment, the parallel dotted protrusions 21 reduce the additional energy loss caused by lateral deflection of the fluid. The centrally located flow-guiding structure 4 provides a shorter and more direct streamline path from the stagnation point on the top surface of the dotted protrusions 21 to the flow-guiding concave surface 51 and the recessed area 31, thereby helping to reduce overall flow resistance. The planar shaped hindrance surface 41 generates flow separation and high-intensity turbulence through steep planar turns, achieving the disruption of the thermal boundary layer and providing stronger local instantaneous heat transfer capability. At the same time, its integrated connection improves structural stiffness and resistance to deformation. Example 5

[0055] This embodiment is basically the same as embodiment one, except that, as follows: Figure 12 As shown, the obstruction structure 4 between two horizontally adjacent dot protrusions 21 is replaced by the flow-guiding structure 5.

[0056] In this embodiment, by replacing the obstruction structure 4 with the flow-guiding structure 5, the lateral flow bottleneck is cleared, dead zones are eliminated, and lateral mixing is enhanced, thereby improving the uniformity of fluid distribution. This also optimizes the flow resistance distribution and improves energy utilization efficiency. Example 6

[0057] This embodiment is basically the same as embodiment one, except that, as follows: Figure 13 As shown, a channel is formed between the two heat exchange plates 6 as in Embodiment 5. The two heat exchange plates 6 are connected by dotted protrusions 21 and the dotted protrusions 21 of the two heat exchange plates 6 are symmetrically arranged. The cross-sectional areas of the two connected dotted protrusions 21 are different.

[0058] In this embodiment, the difference in cross-sectional area between the two polka dot protrusions 21 causes the weld point to deviate from the center, naturally forming an asymmetrical flow channel. The directional flow optimization optimizes the distribution of fluid in the channel width direction, enhancing the flow and heat transfer in the target area. Example 7

[0059] This embodiment is basically the same as embodiment one, except that, as follows: Figure 14 and 15 As shown, a channel is formed between two heat exchange plates 6 as in Embodiment 5. The two heat exchange plates 6 are connected by dotted protrusions 21. The dotted protrusions 21 of the two heat exchange plates 6 are flipped symmetrically, and the cross-sectional areas of the two connected dotted protrusions 21 are the same.

[0060] In this embodiment, the polka dot protrusions 21 of the two heat exchange plates 6 are flipped and symmetrically overlapped to form an X-shaped weld point, which solves the problems of excessively large weld points and insufficient disturbance.

[0061] The working principle of the above embodiment is that the fluid enters the heat exchange unit through the gap between the two heat exchange plates 6 at the edge of the heat exchange unit. Inside, the dotted protrusion array 2 divides the fluid into a main flow channel 3 and a secondary flow channel in the transverse gap connecting adjacent main flow channels 3, forming a main and secondary dual flow path system. The direction and magnitude of the main flow and secondary flow are adjusted by the flow guiding structure 5 and the blocking structure 4.

[0062] When the fluid impacts the convex point 21, it accelerates and pressurizes, causing the boundary layer to thin and enhancing heat transfer; when it flows through the depression 31, it decelerates and diffuses, forcing flow separation to generate turbulent vortices that destroy the thermal boundary layer.

[0063] Furthermore, by guiding the fluid through the arc surface to generate a lateral velocity component, the fluid is three-dimensionally mixed to eliminate temperature stratification, enhance the uniformity of heat transfer, and ultimately achieve a stronger heat transfer effect.

[0064] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0065] Although this document frequently uses terms such as plate, dotted protrusion array, dotted protrusion, main channel, recess, obstruction structure, shaped obstruction surface, flow guiding structure, shaped flow guiding concave surface, and heat exchange plate, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A heat exchange plate, comprising a plate body (1), characterized in that, The plate (1) is provided with at least two rows of polka dot protrusion arrays (2) distributed in the transverse direction, and a main channel (3) is formed between the two rows of polka dot protrusion arrays (2). The polka dot protrusion array (2) includes a number of polka dot protrusions (21) distributed in the longitudinal direction and having an arc-shaped cross section A. A blocking structure (4) is provided between two polka dot protrusions (21) that are adjacent in the transverse direction, and a drainage structure (5) is provided between two polka dot protrusions (21) that are adjacent in the longitudinal direction and belong to different polka dot protrusion arrays (2).

2. The heat exchange plate according to claim 1, characterized in that, The dot protrusion array (2) includes at least three dot protrusions (21) distributed longitudinally and with an arc-shaped cross-section. The obstruction structure (4) between two laterally adjacent dot protrusions (21) is replaced by a drainage structure (5).

3. The heat exchange plate according to claim 1, characterized in that, The plate (1) is provided with at least three rows of horizontally distributed dot protrusion arrays (2), and the drainage structure (5) between two longitudinally adjacent dot protrusions (21) is replaced by the blocking structure (4).

4. The heat exchange plate according to claim 1, characterized in that, The polka dot protrusions (21) of two adjacent rows of polka dot protrusion arrays (2) are arranged in a staggered manner along the longitudinal direction.

5. The heat exchange plate according to claim 1, characterized in that, The straight-line distance between the centers of any two adjacent convex points (21) is equal.

6. The heat exchange plate according to any one of claims 1-5, characterized in that, The main channel (3) is provided with a number of recesses (31) spaced apart along the longitudinal direction. The recesses (31) are located between four adjacent wave point protrusions (21). The recesses (31) are also connected to two drainage structures (5) and two blocking structures (4) that connect the four wave point protrusions (21).

7. The heat exchange plate according to claim 6, characterized in that, The blocking structure (4) is located between the ends of two adjacent lateral dot protrusions (21), and the drainage structure (5) is located between the ends of two adjacent longitudinal dot protrusions (21). Alternatively, the blocking structure (4) is located between the ends of two adjacent lateral dot protrusions (21), and the drainage structure (5) is located between the middle of two adjacent longitudinal dot protrusions (21).

8. The heat exchange plate according to claim 6, characterized in that, The cross-sectional area of ​​the depression (31) gradually increases from its bottom surface to its top surface, and the cross-sectional area of ​​the dotted protrusion (21) gradually increases from its top surface to its bottom surface.

9. The heat exchange plate according to any one of claims 1-5, characterized in that, The aforementioned blocking structure (4) includes a molded blocking surface (41) with a cross-section B that is arc-shaped or planar. The drainage structure (5) includes a shaped drainage concave surface (51) with an arc-shaped or planar cross-section C.

10. The heat exchange plate according to any one of claims 1-5, characterized in that, The top surface of the dotted protrusion (21) is a plane or an inclined plane.

11. The heat exchange plate according to any one of claims 1-5, characterized in that, The depth H1 of the blocking structure (4) is 0.5-1.5 times the depth H2 of the dotted protrusion (21); The depth H3 of the drainage structure (5) is 0.5-1.5 times the depth H2 of the dotted protrusion (21).

12. A heat exchange unit, characterized in that, It includes two heat exchange plates (6) as described in any one of claims 1-11, a channel is formed between the two heat exchange plates (6), the two heat exchange plates (6) are connected by dotted protrusions (21) and the dotted protrusions (21) of the two heat exchange plates (6) are symmetrically arranged, and the cross-sectional areas of the two connected dotted protrusions (21) are the same or different. Alternatively, the dotted protrusions (21) of the two heat exchange plates (6) are flipped symmetrically, and the cross-sectional areas of the two connected dotted protrusions (21) are the same or different.

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