Heat dissipation structure and heat dissipation device

Abstract

The utility model discloses a heat dissipation structure and a heat dissipation device, and the heat dissipation structure comprises a substrate which is provided with a liquid inlet side and a liquid outlet side at the two ends of the flowing direction respectively; the multiple fins are arranged on the plate face of one side of the base plate, the cross section of each fin is in a water drop shape, each fin is provided with a round blunt end and a sharp end which are oppositely arranged, the round blunt ends face the liquid inlet side, and the sharp ends face the liquid outlet side; the sizes of the multiple fins in the flowing direction are gradually increased from the liquid inlet side to the liquid outlet side. The flow speed loss of cooling water can be effectively reduced, and meanwhile, the water flow speed is greatly improved, so that the heat dissipation effect of the heat dissipation structure is greatly enhanced. Moreover, in the flowing direction of the cooling liquid, the sizes of the fins are gradually increased, the heat dissipation area of the fins is increased, the flow speed is increased, and the heat dissipation efficiency is improved, so that the problem that the downstream heat dissipation efficiency is insufficient due to heat accumulation in the flowing direction in the heat dissipation process can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation, in particular to a heat dissipation structure and a heat dissipation device. Background Art

[0002] When the motor is running at high speed, the switching frequency of the IGBT power module is high, so it will generate a lot of heat. Electronic control overheating is a common problem in electric drive systems and a common fault. Poor heat dissipation is an important factor leading to electronic control overheating. In order to ensure the normal operation of the IGBT power module, a reasonable water cooling structure needs to be designed to avoid electronic control overheating.

[0003] In the related art, there is a heat dissipation device, in which a plurality of fins are arranged at the bottom of the heat dissipation plate for heat dissipation. However, the plurality of fins are evenly distributed and of equal size, and the heat accumulation in the cooling water flow direction will cause a temperature gradient, resulting in a high temperature downstream of the cooling water flow and poor temperature uniformity of the heat dissipation device. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a heat dissipation structure, in which the size of the fins gradually increases in the flow direction of the coolant, the heat dissipation area of ​​the fins increases accordingly, and the flow rate increases accordingly, which can solve the problem of insufficient downstream heat dissipation efficiency generated during the heat dissipation process.

[0005] The utility model further proposes a heat dissipation device.

[0006] According to the heat dissipation structure of the first aspect of the utility model, the invention comprises: a substrate, wherein the substrate is respectively provided with a liquid inlet side and a liquid outlet side at both ends in the flow direction; a plurality of fins, wherein the plurality of fins are arranged on a plate surface on one side of the substrate, the cross-section of the fin is teardrop-shaped, the fin has a rounded blunt end and a sharp end which are arranged oppositely, the rounded blunt end faces the liquid inlet side, and the sharp end faces the liquid outlet side, and the dimensions of the plurality of fins along the flow direction gradually increase from the liquid inlet side to the liquid outlet side.

[0007] According to the heat dissipation structure of the embodiment of the utility model, by designing the cross section of the fin to be in the shape of a water drop, and the rounded end of the fin faces the liquid inlet side, and the sharp end of the fin faces the liquid outlet side, the coolant can fully contact the fins after flowing in from the liquid inlet side of the substrate to achieve efficient heat exchange, and flow out from the liquid outlet side of the substrate, which can effectively reduce the cooling water flow rate loss, and greatly increase the water flow rate, thereby greatly enhancing the heat dissipation effect of the heat dissipation structure. Moreover, in the flow direction of the coolant, the size of the fin gradually increases, and the heat dissipation area of ​​the fin will increase accordingly, improving the heat dissipation efficiency. Also, in the flow direction of the coolant, the size of the fin gradually increases, the water flow space will gradually "converge", the flow rate will increase accordingly, and the heat dissipation efficiency will be increased, thereby solving the problem of insufficient downstream heat dissipation efficiency caused by heat accumulation along the flow direction during the heat dissipation process.

[0008] Optionally, the contour line of the fin cross section includes: an arc segment and a straight segment, two ends of the arc segment are respectively tangently connected to two straight segments, the arc segment constitutes the rounded blunt end, and the two straight segments intersect to form the sharp end.

[0009] Optionally, the arc segment includes at least a first arc segment, a second arc segment and a third arc segment connected end to end, the first arc segment and the third arc segment are symmetrically arranged at two ends of the second arc segment, and the center line of the second arc segment is arranged along the flow direction.

[0010] Optionally, the radius of the second arc segment is r1, the radius of the first arc segment or the third arc segment is r2, and r1<r2.

[0011] Optionally, the dimension of the fin along the flow direction is L, and the r1 and the L satisfy the relationship: 0.1L<r1<0.2L; and / or, the r2 and the L satisfy the relationship: 0.3L<r2<0.5L.

[0012] Optionally, the fin has a center line along the flow direction, and the angle between the straight line segment and the center line is α, and α satisfies the relationship: 10°<α<20°.

[0013] Optionally, the dimension of the fin along the flow direction is L, the length dimension of the straight line segment is l, and L and l satisfy the relationship: 0.6L<l<0.7L.

[0014] Optionally, the fins are arranged in an array on the surface of the substrate, the fins in adjacent rows are staggered, the fins in adjacent columns are staggered, the fins at the head end of each row are arranged on the liquid inlet side, and the fins at the tail end are arranged on the liquid outlet side.

[0015] The heat dissipation device according to the second embodiment of the utility model includes: the heat dissipation structure described above.

[0016] Optionally, the heat dissipation device also includes: a heat dissipation body, a receiving groove is provided in the heat dissipation body, the substrate cover is arranged on the receiving groove to form a receiving cavity, a plurality of fins are arranged in the receiving cavity, and the heat dissipation body is provided with a liquid inlet and a liquid outlet connected to the receiving groove.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic structural diagram of a heat dissipation device according to an embodiment of the utility model;

[0020] Figure 2 is a cross-sectional schematic diagram of a heat dissipation device according to an embodiment of the utility model;

[0021] Figure 3 is a structural schematic diagram of a heat dissipation structure according to an embodiment of the utility model;

[0022] Figure 4 is a schematic cross-sectional view of a fin according to an embodiment of the utility model;

[0023] Figure 5 is a schematic diagram of an array of fins according to an embodiment of the utility model;

[0024] Figure 6 It is a schematic diagram of the flow path of the coolant in the gaps between multiple fins;

[0025] Figure 7 This is a simulation diagram of the coolant flow in the gaps between multiple fins;

[0026] Figure 8 It is a simulated temperature variation curve of the surface of the heat dissipation device along the center line of the water flow direction according to an embodiment of the utility model (the left side is the position where the coolant flows into the liquid inlet).

[0027] Reference numerals:

[0028] 100. Heat dissipation device;

[0029] 10. substrate; 11. liquid inlet side; 12. liquid outlet side;

[0030] 20, fin; 21, rounded blunt end; 22, sharp end; 23, arc segment; 231, first arc segment; 232, second arc segment; 233, third arc segment; 24, straight segment;

[0031] 30. heat dissipation body; 31. receiving tank; 32. liquid inlet; 33. liquid outlet;

[0032] 40. Seals. DETAILED DESCRIPTION

[0033] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0034] Reference below Figure 1-Figure 8 A heat dissipation device and a heat dissipation structure thereof according to an embodiment of the utility model are described.

[0035] like Figure 1-Figure 5 As shown, the heat dissipation structure includes: a substrate 10 and a plurality of fins 20 .

[0036] The substrate 10 is provided with a liquid inlet side 11 and a liquid outlet side 12 at both ends of the flow direction, and a plurality of fins 20 are provided on one side of the substrate 10. The cross-section of the fin 20 is teardrop-shaped. The fin 20 has a rounded blunt end 21 and a sharp end 22 that are relatively arranged. The rounded blunt end 21 faces the liquid inlet side 11, and the sharp end 22 faces the liquid outlet side 12. The dimensions of the plurality of fins 20 along the flow direction gradually increase from the liquid inlet side 11 to the liquid outlet side 12.

[0037] Since the cross section of the fin 20 is in the shape of a water drop, it exhibits extremely small fluid resistance in the fluid, which can effectively reduce the cooling water flow rate loss and improve the heat dissipation effect. In addition, the rounded blunt end 21 of the fin 20 faces the liquid inlet side 11, and the sharp end 22 of the fin 20 faces the liquid outlet side 12, so that the coolant can fully contact the fin 20 after flowing in from the liquid inlet side 11 of the substrate 10 to achieve efficient heat exchange, and flow out from the liquid outlet side 12 of the substrate 10, while greatly increasing the water flow rate, thereby greatly enhancing the heat dissipation effect.

[0038] Moreover, in the flow direction of the coolant, the size of the fin 20 gradually increases, and the heat dissipation area of ​​the fin 20 will increase accordingly, thereby improving the heat dissipation efficiency. Also, in the flow direction of the coolant, the size of the fin 20 gradually increases, the water flow space will gradually "converge", and the flow rate will increase accordingly, thereby increasing the heat dissipation efficiency. Based on these two gain effects, the problem of insufficient downstream heat dissipation efficiency caused by heat accumulation along the flow direction during the heat dissipation process of the power module can be solved.

[0039] In addition, the heat dissipation effect of the heat dissipation structure is simulated and verified, such as Figure 8As shown, the results show that the heat dissipation effect on the right side of the heat dissipation structure (i.e., downstream of the cooling water) is improved. In addition, the water flow velocity of the heat dissipation structure is simulated and verified, and the results show that the cooling water flow velocity downstream of the heat dissipation structure is significantly increased.

[0040] Compared with the prior art in which multiple fins 20 are evenly distributed and equal in size, the size of the fins 20 of the heat dissipation structure along the flow direction gradually increases from the liquid inlet side 11 to the liquid outlet side 12, effectively improving the heat dissipation uniformity of the heat dissipation device 100.

[0041] Thus, by designing the cross section of the fin 20 to be drop-shaped, and the rounded end 21 of the fin 20 is facing the liquid inlet side 11, and the sharp end 22 of the fin 20 is facing the liquid outlet side 12, the coolant can fully contact the fin 20 after flowing in from the liquid inlet side 11 of the substrate 10 to have efficient heat exchange, and flow out from the liquid outlet side 12 of the substrate 10, which can effectively reduce the cooling water flow rate loss, and greatly increase the water flow rate, thereby greatly enhancing the heat dissipation effect of the heat dissipation structure. Moreover, in the flow direction of the coolant, the size of the fin 20 gradually increases, the heat dissipation area of ​​the fin 20 will increase accordingly, and the heat dissipation efficiency will be improved. And, in the flow direction of the coolant, the size of the fin 20 gradually increases, the water flow space will gradually "converge", the flow rate will increase accordingly, and the heat dissipation efficiency will be increased, thereby solving the problem of insufficient downstream heat dissipation efficiency caused by heat accumulation along the flow direction during the heat dissipation process. Compared with the prior art, the heat dissipation efficiency of the heat dissipation device 100 downstream of the coolant is improved, and the heat dissipation uniformity is improved.

[0042] Furthermore, the contour line of the cross section of the fin 20 includes: an arc segment 23 and a straight segment 24 , the two ends of the arc segment 23 are tangently connected to the two straight segments 24 , the arc segment 23 forms a rounded blunt end 21 , and the two straight segments 24 intersect to form a sharp end 22 .

[0043] Please refer to Figure 3 As shown, the two ends of the arc segment 23 are tangent to the two straight segments 24 respectively, and the two straight segments 24 intersect at one point, thereby forming the outline of the fin 20. Based on this structural design, the simulation verification results show that when the coolant flows through the fin 20, the flow is extremely smooth, and almost no eddy current loss is generated, effectively avoiding the flow velocity loss of the fluid. Compared with the fin 20 structure of the prior art, the water flow velocity can be increased, thereby improving the heat dissipation efficiency.

[0044] Furthermore, the arc segment 23 at least includes a first arc segment 231, a second arc segment 232 and a third arc segment 233 connected end to end, the first arc segment 231 and the third arc segment 233 are symmetrically arranged at both ends of the second arc segment 232, and the center line of the second arc segment 232 is arranged along the flow direction.

[0045] Please refer to Figure 3In one embodiment shown, the arc segment 23 includes a first arc segment 231, a second arc segment 232 and a third arc segment 233. The first arc segment 231 and the third arc segment 233 are symmetrically arranged at the two ends of the second arc segment 232. In other words, the first arc segment 231 and the third arc segment 233 are symmetrically arranged in the same circle. The first arc segment 231 and the third arc segment 233 are symmetrically arranged relative to the second arc segment 232, and one end of the first arc segment 231 and one end of the third arc segment 233 are tangentially connected to a straight line segment 24 respectively. In this way, the fin 20 has a center line along the flow direction. Since the rounded blunt end 21 of the fin 20 is composed of at least two arcs with different radii, a better drag reduction effect can be achieved, thereby effectively avoiding the flow velocity loss of the fluid, thereby improving the heat dissipation efficiency of the heat dissipation structure.

[0046] Further, the arc segment 23 may also include more arcs with different radii, for example, the arc segment 23 includes a first arc segment 231, a second arc segment 232, a third arc segment 233, a fourth arc segment 23 and a fifth arc segment 23 connected end to end, the second arc segment 232 and the fourth arc segment 23 are symmetrically arranged at both ends of the third arc segment 233, and the first arc segment 231 and the fifth arc segment 23 are symmetrically arranged at one end of the second arc segment 232 and the fourth arc segment 23, respectively. Among them, the first arc segment 231 and the fifth arc segment 23 are from symmetrical arc segments in the same circle, and the second arc segment 232 and the fourth arc segment 23 are from symmetrical arc segments in the same circle, so as to achieve a better drag reduction effect.

[0047] Furthermore, the radius of the second arc segment 232 is r1, and the radius of the first arc segment 231 or the third arc segment 233 is r2, and r1<r2.

[0048] Since the first arc segment 231 and the third arc segment 233 are symmetrical arc segments in the same circle, the radius of the first arc segment 231 and the third arc segment 233 are the same, and the radius of the first arc segment 231 / the third arc segment 233 is larger than the radius of the second arc segment 232, so that the coolant can fully contact all surfaces of the blunt end 21 of the fin 20 after flowing in from the liquid inlet side 11 of the substrate 10 to have efficient heat exchange, and flow out from the liquid outlet side 12 of the substrate 10, thereby effectively reducing the cooling water flow rate loss. If the radius of the first arc segment 231 / the third arc segment 233 is smaller than the radius of the second arc segment 232, so that the curvature of the first arc segment 231 and the third arc segment 233 is relatively gentle, the coolant cannot fully contact the surface of the first arc segment 231 and the third arc segment 233 and flows directly, reducing the heat dissipation efficiency.

[0049] Further, the dimension of the fin 20 along the flow direction is L, and r1 and L satisfy the relationship: 0.1L<r1<0.2L; and / or, r2 and L satisfy the relationship: 0.3L<r2<0.5L.

[0050] By designing the size range of r1 to be within 0.1L to 0.2L and the size range of r2 to be within 0.3L to 0.5L, the cooling water can flow extremely smoothly when passing through the surface of this structure with almost no eddy current loss. Therefore, this structure exhibits extremely small fluid resistance in the fluid, effectively avoiding the flow rate loss of the fluid.

[0051] Furthermore, the fin 20 has a center line along the flow direction, and the angle between the straight section 24 and the center line is α, and α satisfies the relationship: 10°<α<20°.

[0052] By setting the angle between the straight segment 24 and the center line within 10° to 20°, it is ensured that the sharp end 22 has sufficient heat dissipation area to exchange heat with the coolant. If the angle is too large, the heat dissipation area of ​​the sharp end 22 will be too small, and the water flow space will not be in a gradually "convergent" state, which will result in the flow rate not increasing too much, affecting the heat dissipation efficiency; if the angle is too small, the straight segment 24 will be relatively flat, which is not conducive to driving the flow of the coolant. Therefore, the angle between the straight segment 24 and the center line is set within 10° to 20°. When the cooling water passes through the surface of this structure, the flow is relatively stable, and almost no eddy current loss is generated. Therefore, it shows very small fluid resistance in the fluid, effectively avoiding the loss of fluid flow rate.

[0053] Furthermore, the dimension of the fin 20 along the flow direction is L, the length dimension of the straight section 24 is l, and L and l satisfy the relationship: 0.6L<l<0.7L.

[0054] Since the straight section 24 has a certain angle with the flow direction, the length of the straight section 24 is designed to be within 0.6L~0.7L, which can ensure that the sharp end 22 of the fin 20 has sufficient heat dissipation area and facilitate the flow of the coolant, making the coolant flow more smoothly and effectively avoiding the flow rate loss of the fluid.

[0055] like Figure 6 and Figure 7 As shown, r1=0.16L, r2=0.4L, l=0.66L, α=15°. The simulation verification results show that the cooling water flows very smoothly when passing through the surface of this structure, and almost no eddy current loss is generated. Therefore, this structure exhibits extremely small fluid resistance in the fluid, effectively avoiding the flow rate loss of the fluid.

[0056] Furthermore, the fins 20 are arranged in an array on the surface of the substrate 10, the fins 20 in adjacent rows are staggered, and the fins 20 in adjacent columns are staggered. The fins 20 at the head end of each row are arranged on the liquid inlet side 11, and the fins 20 at the tail end are arranged on the liquid outlet side 12.

[0057] Specifically, multiple rows and columns of fins 20 are arranged at intervals on the board surface of the substrate 10, and the fins 20 in adjacent rows are staggered, and the fins 20 in adjacent columns are staggered, which is conducive to more sufficient contact between the coolant and the fins 20, thereby improving the heat dissipation effect of the heat dissipation structure. In addition, under the premise of ensuring that the coolant is in full contact with the fins 20, the fins 20 on the substrate 10 are compactly distributed, and the number of fins 20 is increased as much as possible to improve the heat dissipation effect of the heat dissipation structure.

[0058] like Figure 5 In the embodiment shown, the distance between the centers of the blunt ends of adjacent fins 20 in each column is 5 mm, and the distance between the centers of the blunt ends 21 of adjacent fins 20 in each row is 6.2 mm. Among them, the dimensions of the fins 20 in each row along the flow direction from the liquid inlet side 11 to the liquid outlet side 12 are 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, etc.

[0059] Of course, the above-mentioned embodiment of the fin 20 is only one implementation mode of the present invention. The overall size of the fin 20 or the gradient of the size increase in the water flow direction can be adjusted according to actual product requirements to achieve different heat dissipation goals.

[0060] The heat dissipation device 100 according to the second embodiment of the utility model includes: a heat dissipation structure.

[0061] The heat dissipation device 100 also includes: a heat dissipation body 30, a receiving groove 31 is provided in the heat dissipation body 30, the substrate 10 is covered on the receiving groove 31 to form a receiving cavity, a plurality of fins 20 are arranged in the receiving cavity, and the heat dissipation body 30 is provided with a liquid inlet 32 ​​and a liquid outlet 33 connected to the receiving groove 31.

[0062] Please refer to Figure 1 and Figure 4As shown, the electronic components that need to dissipate heat are installed on the other side of the substrate 10, and the heat exchange with the coolant in the receiving groove 31 is realized through the fins 20 of the heat dissipation structure to achieve heat dissipation. The heat dissipation device 100 of the present application increases the heat exchange area with the liquid by arranging multiple fins 20 on one side of the substrate 10. When dissipating heat, the coolant flows into the receiving groove 31 from the liquid inlet 32 ​​of the heat dissipation body 30, passes through the receiving cavity inside the heat dissipation device 100 and the gaps between the fins 20, and flows out from the liquid outlet 33, taking away the heat source heat transferred by the heat dissipation structure, achieving the effect of cooling and heat dissipation.

[0063] In addition, the heat dissipation device 100 includes a sealing member 40, which is disposed between the heat dissipation body 30 and the substrate 10. During assembly, the screw holes of each component are tightened, such as screws. Exemplarily, the sealing member 40 can be a sealing gasket.

[0064] Therefore, by designing the cross section of the fin 20 to be drop-shaped, and the blunt end 21 of the fin 20 is facing the liquid inlet side 11, and the sharp end 22 of the fin 20 is facing the liquid outlet side 12, so that the coolant can fully contact with the fin 20 after flowing in from the liquid inlet side 11 of the substrate 10 to have efficient heat exchange, and flow out from the liquid outlet side 12 of the substrate 10, it can effectively reduce the cooling water flow rate loss, and at the same time greatly increase the water flow rate, thereby greatly enhancing the heat dissipation effect of the heat dissipation structure. Moreover, in the flow direction of the coolant, the size of the fin 20 gradually increases, the heat dissipation area of ​​the fin 20 will increase accordingly, and the heat dissipation efficiency will be improved. And, in the flow direction of the coolant, the size of the fin 20 gradually increases, the water flow space will gradually "converge", the flow rate will increase accordingly, and the heat dissipation efficiency will be increased, thereby solving the problem of insufficient downstream heat dissipation efficiency caused by heat accumulation along the flow direction during the heat dissipation process. Compared with the prior art, the heat dissipation efficiency of the heat dissipation device 100 downstream of the coolant is improved, and the heat dissipation uniformity is improved.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0067] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat dissipation structure, characterized in that: include: A substrate, wherein the substrate is provided with a liquid inlet side and a liquid outlet side at two ends of the substrate in the flow direction; A plurality of fins are provided on a plate surface on one side of the substrate, the cross section of the fin is teardrop-shaped, the fin has a rounded blunt end and a sharp end which are arranged opposite to each other, the rounded blunt end faces the liquid inlet side, and the sharp end faces the liquid outlet side, and the size of the plurality of fins along the flow direction gradually increases from the liquid inlet side to the liquid outlet side.

2. The heat dissipation structure according to claim 1, characterized in that: The contour line of the fin cross section includes: an arc segment and a straight segment, the two ends of the arc segment are respectively tangently connected to the two straight segments, the arc segment constitutes the rounded blunt end, and the intersection of the two straight segments constitutes the sharp end.

3. The heat dissipation structure according to claim 2, characterized in that: The arc segment at least includes a first arc segment, a second arc segment and a third arc segment connected end to end, the first arc segment and the third arc segment are symmetrically arranged at two ends of the second arc segment, and the center line of the second arc segment is arranged along the flow direction.

4. The heat dissipation structure according to claim 3, characterized in that: The radius of the second arc segment is r1, the radius of the first arc segment or the third arc segment is r2, and r1<r2.

5. The heat dissipation structure according to claim 4, characterized in that: The dimension of the fin along the flow direction is L, and the r1 and the L satisfy the relationship: 0.1L<r1<0.2L; and / or, the r2 and the L satisfy the relationship: 0.3L<r2<0.5L.

6. The heat dissipation structure according to claim 2, characterized in that: The fin has a center line along the flow direction, and the angle between the straight line segment and the center line is α, and α satisfies the relationship: 10°<α<20°.

7. The heat dissipation structure according to claim 2, characterized in that: The dimension of the fin along the flow direction is L, the length dimension of the straight line segment is l, and L and l satisfy the relationship: 0.6L<l<0.7L.

8. The heat dissipation structure according to claim 1, characterized in that: The fins are arranged in an array on the surface of the substrate, the fins in adjacent rows are staggered, the fins in adjacent columns are staggered, the fins at the head end of each row are arranged on the liquid inlet side, and the fins at the tail end are arranged on the liquid outlet side.

9. A heat dissipation device, characterized in that: include: The heat dissipation structure according to any one of claims 1 to 8.

10. The heat dissipation device according to claim 9, characterized in that: The heat dissipation device also includes: a heat dissipation body, a receiving groove is provided in the heat dissipation body, the substrate cover is arranged on the receiving groove to form a receiving cavity, a plurality of fins are arranged in the receiving cavity, and the heat dissipation body is provided with a liquid inlet and a liquid outlet connected to the receiving groove.

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