Cooling device

Abstract

To provide a cooling device that can exhibit excellent cooling performance. [Solution] The cooling device 1 comprises a cooling section 10 that is thermally connected to a heating element 5 and has a connecting surface 12 extending along the XZ plane. Inside the cooling section 10, a plurality of flow channels 20 extending along the Z direction are formed side by side in the X direction. The flow channels 20 include a proximity section 30 that is relatively close to the connecting surface 12 and a separation section 40 that is further away from the connecting surface 12 than the proximity section 30. The proximity section 30 has a bottom surface 31 that is close to the connecting surface 12, proximity sides 32A, 32B that extend in the Y direction from both sides of the bottom surface 31 in the X direction, and a plurality of ribs 33 that protrude from the bottom surface 31 in the Y direction and extend between the proximity sides 32A, 32B. The separation section 40 has a variation section 41A, 41B formed by making two sides connected in the Z direction to the separation vertex that is furthest from the bottom surface 31 among the four vertices of a square that rotates about axis O according to the position along the Z direction.

Description

[Technical Field]

[0001] This invention relates to a cooling device. [Background technology]

[0002] Conventionally, cooling devices called cold plates have been known that cool heat-generating elements such as semiconductor modules by flowing a cooling fluid through multiple channels (see, for example, Patent Document 1). In such cooling devices, improving cooling performance is extremely important, and there is a need to develop channels that can improve cooling performance. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2025-141653 [Overview of the project] [Problems that the invention aims to solve]

[0004] This invention has been made in view of the problems of the prior art, and aims to provide a cooling device that can exhibit excellent cooling performance. [Means for solving the problem]

[0005] According to one aspect of the present invention, a cooling device capable of exhibiting excellent cooling performance is provided. The cooling device includes a cooling unit that is thermally connected to a heat generating body and has a connection surface extending along a width direction and a length direction perpendicular to the width direction. Inside the cooling unit, a plurality of flow paths extending along the length direction are formed side by side in the width direction. Each of the plurality of flow paths includes a proximity portion relatively close to the connection surface and a separation portion farther from the connection surface than the proximity portion. The proximity portion has a bottom surface close to the connection surface, proximity side surfaces extending in a height direction perpendicular to both the width direction and the length direction from both sides in the width direction of the bottom surface, and a plurality of ribs protruding in the height direction from the bottom surface and extending between the proximity side surfaces. The separation portion has a changing portion formed by continuously connecting two sides in the length direction to a separation vertex located at the position farthest from the bottom surface among the four vertices of a rectangle that rotates about an axis extending in the length direction according to the position along the length direction.

Brief Description of the Drawings

[0006] [Figure 1] FIG. 1 is a perspective view showing a cooling device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view showing the flow path of the cooling unit in the cooling device of FIG. 1. [Figure 3] FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2. [Figure 5] FIG. 5 is a partially enlarged view of FIG. 3. [Figure 6A] FIG. 6A is a cross-sectional view showing the shape of the flow path at position Q1 in FIG. 5. [Figure 6B] FIG. 6B is a cross-sectional view showing the shape of the flow path at position Q2 in FIG. 5. [Figure 6C] FIG. 6C is a cross-sectional view showing the shape of the flow path at position Q3 in FIG. 5. [Figure 6D] [[ID= 32]]FIG. 6D is a cross-sectional view showing the shape of the flow path at position Q4 in FIG. 5. [Figure 6E]FIG. 6E is a cross-sectional view showing the shape of the flow path at position Q5 in FIG. 5. [Figure 6F] FIG. 6F is a cross-sectional view showing the shape of the flow path at position Q6 in FIG. 5. [Figure 6G] FIG. 6G is a cross-sectional view showing the shape of the flow path at position Q7 in FIG. 5. [Figure 6H] FIG. 6H is a cross-sectional view showing the shape of the flow path at position Q8 in FIG. 5. [Figure 6I] FIG. 6I is a cross-sectional view showing the shape of the flow path at position Q9 in FIG. 5. [Figure 7A] FIG. 7A is a perspective view showing ribs in another embodiment of the present invention. [Figure 7B] FIG. 7B is a perspective view showing ribs in still another embodiment of the present invention.

MODE FOR CARRYING OUT THE INVENTION

[0007] Hereinafter, embodiments of the cooling device according to the present invention will be described in detail with reference to FIGS. 1 to 7B. In FIGS. 1 to 7B, the same or corresponding components are denoted by the same reference numerals, and redundant descriptions are omitted. Further, in FIGS. 1 to 7B, the scales and dimensions of each component may be exaggerated or some components may be omitted. In the following description and claims, unless otherwise specified, terms such as "first" and "second" are used only to distinguish components from each other and do not represent a specific order or sequence.

[0008] FIG. 1 is a perspective view showing a cooling device 1 in an embodiment of the present invention. This cooling device 1 is attached to a heat-generating body 5 in order to cool the heat-generating body 5 such as a semiconductor module such as a CPU or a GPU, and is also called a cooling plate or a cold plate. In FIG.  1, the heat-generating body 5 is schematically shown, and the size and dimensions of the heat-generating body 5 are not limited to those shown. The cooling device 1 in the present embodiment can be manufactured by, for example, a laminated manufacturing method using a 3D printer.

[0009] As shown in Figure 1, the cooling device 1 consists of a flat cooling section 10. This cooling section 10 is directly or indirectly attached to the heating element 5 and has a connection surface 12 that is thermally connected to the heating element 5. In this embodiment, the connection surface 12 extends along the XZ plane. Inside the cooling section 10, a plurality of flow channels 20 are formed, extending along the Z direction (length direction). These flow channels 20 are arranged in the X direction (width direction). By flowing a cooling fluid (e.g., water) through these flow channels 20, for example, in the +Z direction, the heating element 5 connected to the connection surface 12 is cooled by the cooling fluid flowing through the flow channels 20. Since the plurality of flow channels 20 have the same shape, one of the plurality of flow channels 20 will be described as representative below.

[0010] Figure 2 is a front view showing one of the flow paths 20. As shown in Figure 2, the shape of the flow path 20 at the end face 11 in the -Z direction of the cooling section 10 is a rectangle S0. In this embodiment, the rectangle S0 is a square (for example, with sides of 1 mm). The flow path 20 consists of a proximity portion 30 that is relatively close to the connection surface 12 (on the -Y direction side) and a separation portion 40 that is further away from the connection surface 12 than the proximity portion 30 (on the +Y direction side).

[0011] Figure 3 is a cross-sectional view along line AA in Figure 2, and Figure 4 is a cross-sectional view along line BB in Figure 2. In Figure 4, the scale in the X direction has been enlarged for easier understanding. As shown in Figures 2 to 4, the proximity portion 30 has a bottom surface 31 adjacent to the connection surface 12, proximity sides 32A and 32B extending in the Y direction from both sides of the bottom surface 31 in the X direction, and a plurality of ribs 33 protruding in the Y direction from the bottom surface 31 and extending between the proximity sides 32A and 32B. The separation portion 40 has a change portion 41A and 41B whose shape changes continuously along the Z direction, a separation side 42A connecting the change portion 41A and the proximity side 32A, and a separation side 42B connecting the change portion 41B and the proximity side 32B.

[0012] Figure 5 is a partially enlarged view of Figure 3. As shown in Figure 5, the ribs 33 in this embodiment are arranged at equal intervals with a pitch P along the Z direction. The ribs 33 in this embodiment also have a triangular cross-sectional shape with a height H along the Y direction. The variation sections 41A and 41B are composed of repeating unit shapes of length L, and as shown in Figure 3, the variation sections 41A and 41B in this embodiment are composed of repeating four unit shapes.

[0013] As described above, the shape of the flow path 20 at the end face 11 in the -Z direction of the cooling section 10 is a square S0, but the cross-sectional shape of the flow path 20 changes along the length direction from the square S0 at this end face 11. Figure 6A shows the cross-sectional shape of the flow path 20 at a position Q1 (see Figure 5) shifted in the +Z direction from the end face 11 in the -Z direction of the cooling section 10. As shown in Figure 6A, at this position Q1, two sides 50A1 and 50B1 of a square S1 rotated clockwise from the rotation angle of the square S0 (Figure 2) around axis O constitute part of the cross-sectional shape of the flow path 20. One side of square S1 is shorter than one side of square S0. These two sides 50A1 and 50B1 are at the vertex V, which is the furthest from the base 31 among the four vertices of square S1. S1 They are connected to each other at (separated vertices). Edge 50A1 forms a modified portion 41A of the separated portion 40, and edge 50B1 forms a modified portion 41B of the separated portion 40. Also, vertex V S1 Adjacent vertex V T1 A straight line connecting the adjacent vertex and the end of the adjacent side surface 32B forms the separated side surface 42B.

[0014] Figure 6B shows the cross-sectional shape of the channel 20 at position Q2, which is further shifted in the +Z direction from position Q1. As shown in Figure 6B, at position Q2, two sides 50A2 and 50B2 of square S2, which is rotated clockwise from the rotation angle of square S1 around axis O, constitute part of the cross-sectional shape of the channel 20. One side of square S2 is shorter than one side of square S1. These two sides 50A2 and 50B2 are located at vertex V, which is the furthest point from the base 31 among the four vertices of square S2. S2(The separated vertices) are connected to each other. Side 50A2 forms the changing part 41A of the separated part 40, and side 50B2 forms the changing part 41B of the separated part 40. Also, vertex V S2 The straight line connecting the vertex V T2 (adjacent vertex) adjacent to it and the end of the proximity side face 32B forms the separated side face 42B.

[0015] FIG. 6C shows the cross-sectional shape of the flow path 20 at the position Q3 shifted further in the +Z direction from the position Q2. As shown in FIG. 6C, at this position Q3, two sides 50A3, 50B3 of the square S3 rotated clockwise from the rotation angle of the square S2 around the axis O constitute a part of the cross-sectional shape of the flow path 20. One side of the square S3 is shorter than one side of the square S2. These two sides 50A3, 50B3 are connected to each other at the vertex V S3 (the separated vertex) which is the position farthest from the bottom surface 31 among the four vertices of the square S3. Side 50A3 forms the changing part 41A of the separated part 40, and side 50B3 forms the changing part 41B of the separated part 40. Also, vertex V S3 The straight line connecting the vertex V T3 (adjacent vertex) adjacent to it and the end of the proximity side face 32B forms the separated side face 42B.

[0016] FIG. 6D shows the cross-sectional shape of the flow path 20 at the position Q4 shifted further in the +Z direction from the position Q3. As shown in FIG. 6D, at this position Q4, two sides 50A4, 50B4 of the square S4 rotated clockwise from the rotation angle of the square S3 around the axis O constitute a part of the cross-sectional shape of the flow path 20. One side of the square S4 is shorter than one side of the square S3. These two sides 50A4, 50B4 are connected to each other at the vertex V S4 (the separated vertex) which is the position farthest from the bottom surface 31 among the four vertices of the square S4. Side 50A4 forms the changing part 41A of the separated part 40, and side 50B4 forms the changing part 41B of the separated part 40. Also, vertex V S4 The straight line connecting the vertex V T4 (adjacent vertex) adjacent to it and the end of the proximity side face 32B forms the separated side face 42B, and the straight line connecting the vertex V S4 The vertex V R4A straight line connecting the adjacent vertex and the adjacent side surface 32A forms the separated side surface 42A.

[0017] Figure 6E shows the cross-sectional shape of the channel 20 at position Q5, which is further shifted in the +Z direction from position Q4. As shown in Figure 6E, at position Q5, two sides 50A5 and 50B5 of square S5, which is rotated clockwise from the rotation angle of square S4 around axis O, constitute part of the cross-sectional shape of the channel 20. These two sides 50A5 and 50B5 are located at vertex V, which is the furthest point from the base surface 31 among the four vertices of square S5. S5 They are connected to each other at (separated vertices). Edge 50A5 forms a modified portion 41A of the separated portion 40, and edge 50B5 forms a modified portion 41B of the separated portion 40. Also, vertex V S5 Adjacent vertex V T5 A straight line connecting (adjacent vertex) and the end of the adjacent side surface 32B forms the separated side surface 42B, and vertex V S5 Adjacent vertex V R5 A straight line connecting the adjacent vertex and the adjacent side surface 32A forms the separated side surface 42A.

[0018] As shown in Figures 6A to 6D, the square that constitutes part of the cross-sectional shape of the flow channel 20 rotates around axis O as you move in the +Z direction, and the length of one side of the square gradually shortens. At a position where the square rotating around axis O has rotated 45 degrees from square S0 (Figure 2) (between position Q4 (Figure 6D) and position Q5 (Figure 6E)), the length of one side of the square that constitutes part of the cross-sectional shape of the flow channel 20 is at its minimum, and as you move further in the +Z direction from that position, the length of one side of the square gradually increases.

[0019] Figure 6F shows the cross-sectional shape of the channel 20 at position Q6, which is further shifted in the +Z direction from position Q5. As shown in Figure 6F, at position Q6, two sides 50A6 and 50B6 of square S6, which is rotated clockwise from the rotation angle of square S5 around axis O, constitute part of the cross-sectional shape of the channel 20. One side of square S6 is longer than one side of square S5. These two sides 50A6 and 50B6 are located at vertex V, which is the furthest point from the base 31 among the four vertices of square S6. S6They are connected to each other at (separated vertices). Edge 50A6 forms a modified portion 41A of the separated portion 40, and edge 50B6 forms a modified portion 41B of the separated portion 40. Also, vertex V S6 Adjacent vertex V T6 A straight line connecting (adjacent vertex) and the end of the adjacent side surface 32B forms the separated side surface 42B, and vertex V S6 Adjacent vertex V R6 A straight line connecting the adjacent vertex and the adjacent side surface 32A forms the separated side surface 42A.

[0020] Figure 6G shows the cross-sectional shape of the channel 20 at position Q7, which is further shifted in the +Z direction from position Q6. As shown in Figure 6G, at position Q7, two sides 50A7 and 50B7 of square S7, which is rotated clockwise from the rotation angle of square S6 around axis O, constitute part of the cross-sectional shape of the channel 20. One side of square S7 is longer than one side of square S6. These two sides 50A7 and 50B7 are located at vertex V, which is the furthest point from the base 31 among the four vertices of square S7. S7 They are connected to each other at (separated vertices). Edge 50A7 forms a modified portion 41A of the separated portion 40, and edge 50B7 forms a modified portion 41B of the separated portion 40. Also, vertex V S7 Adjacent vertex V R7 A straight line connecting the adjacent vertex and the adjacent side surface 32A forms the separated side surface 42A.

[0021] Figure 6H shows the cross-sectional shape of the channel 20 at position Q8, which is further shifted in the +Z direction from position Q7. As shown in Figure 6H, at position Q8, two sides 50A8 and 50B8 of square S8, which is rotated clockwise from the rotation angle of square S7 around axis O, constitute part of the cross-sectional shape of the channel 20. One side of square S8 is longer than one side of square S7. These two sides 50A8 and 50B8 are located at vertex V, which is the furthest point from the base 31 among the four vertices of square S8. S8 They are connected to each other at (separated vertices). Edge 50A8 forms a modified portion 41A of the separated portion 40, and edge 50B8 forms a modified portion 41B of the separated portion 40. Also, vertex V S8 Adjacent vertex V R8A straight line connecting the adjacent vertex and the adjacent side surface 32A forms the separated side surface 42A.

[0022] Figure 6I shows the cross-sectional shape of the flow path 20 at position Q9, which is further shifted in the +Z direction from position Q8. As shown in Figure 6I, at position Q9, two sides 50A9 and 50B9 of square S9, which is rotated clockwise from the rotation angle of square S8 around axis O, constitute part of the cross-sectional shape of the flow path 20. One side of square S9 is longer than one side of square S8. At position Q9, square S9 is rotated exactly 90 degrees from the rotation angle of square S0 (Figure 2), and square S9 is identical to square S0. At position Q9, side 51 of square S9 forms the separation side 42A and the proximity side 32A, and side 52 of square S9 forms the separation side 42B and the proximity side 32B.

[0023] Thus, the change sections 41A and 41B are formed by extending two sides connected to the separated vertices of a square rotating around axis O in the +Z direction, and the separated sides 42A and 42B are formed by extending straight lines in the +Z direction connecting the adjacent vertices adjacent to the separated vertices of the square rotating around axis O to the nearby sides 32A and 32B. A square rotating around axis O forms the same shape each time it rotates 90 degrees. Therefore, when the cooling section 10 is rotated 90 degrees from the square S0 at the -Z end face 11 to the square S9 at position Q9, a unit shape of length L (see Figure 3) is formed. This configuration shape is repeatedly formed (3 times) on the +Z side from position Q9.

[0024] Thus, in this embodiment, the modified sections 41A and 41B are formed by continuously arranging rectangles (squares) that rotate along the Z direction in the Z direction. These rectangles (squares) that rotate along the Z direction impart a twisted surface to the modified sections 41A and 41B.

[0025] In this embodiment, when the cooling fluid flows through the flow path 20 in the Z direction, the cooling fluid repeatedly separates and reattaches due to the multiple ribs 33 located close to the heat-generating element 5, forming localized vortices downstream of the ribs 33. These localized vortices repeatedly break the thermal boundary layer, activating heat exchange between the cooling fluid and the heat-generating element 5 connected to the connection surface 12. Therefore, the fluid on the bottom surface 31 is constantly agitated, suppressing localized temperature increases and hot spots.

[0026] Furthermore, each rib 33 extends between the adjacent side surface 32A and the adjacent side surface 32B, and since the width of the rib 33 is the same as the maximum width of the flow path 20, the rib 33 can effectively generate vortices.

[0027] Furthermore, the twisted surfaces of the modified sections 41A and 41B described above cause the cooling fluid flowing through the channel 20 to swirl, allowing for the periodic replacement of the layers of cooling fluid that tend to undergo temperature stratification in the height direction. This allows the low-temperature fluid located far from the connection surface 12 to be guided to the proximity section 30, and the high-temperature layer near the bottom surface 31 of the proximity section 30 to be replaced with the low-temperature fluid. Therefore, stagnation of the cooling fluid near the bottom surface 31 of the proximity section 30 can be prevented, and the thickening of the temperature boundary layer can be suppressed. As a result, even with a heat transfer structure on only one side of the cooling section 10 (the connection surface 12), a high heat transfer coefficient and temperature uniformity can be achieved.

[0028] Furthermore, in this embodiment, the separation sides 42A and 42B of the separation section 40 are connected to the proximity sides 32A and 32B of the proximity section 30, respectively, and the separation sides 42A and 42B and the proximity sides 32A and 32B are each composed of the same continuous surface. Therefore, the pressure loss of the cooling fluid guided from the separation section 40 to the proximity section 30 is reduced by the twisted surfaces of the change sections 41A and 41B.

[0029] As described above, the introduction of low-temperature fluid into the adjacent section 30 by the twisted surfaces of the change sections 41A and 41B and the generation of vortices by the ribs 33 occur periodically, so that continuous breakdown of the thermal boundary layer and renewal of the cooling fluid occur simultaneously, resulting in a synergistic heat transfer promotion effect.

[0030] Here, the height H of the rib 33 is, for example, 0.1 mm to 0.4 mm, and the pitch P of the rib 33 is 0.6 mm to 4.2 mm. For example, if the cooling device 1 is manufactured by additive manufacturing, the surface roughness of the bottom surface 31 may affect the effect of the rib 33, so it is preferable to increase the height H of the rib 33. It is preferable to arrange the ribs 33 at a predetermined pitch P so that vortices generated downstream of the rib 33 are regenerated at the next rib 33 before the vortices generated downstream of the rib 33 are attenuated. Specifically, if the ratio P / H of the pitch P to the height H of the rib 33 is less than 5, the flow of the cooling fluid in the flow path 20 tends to stagnate, and if P / H is greater than 10, the vortices generated at the rib 33 disappear before they can be regenerated, so it is preferable that P / H be in the range of 3 to 15, and more preferably in the range of 5 to 10.

[0031] The above describes an example where the ribs 33 are arranged at a constant pitch P. However, the pitch P may be changed according to the conditions of the location, for example, by increasing the pitch P in areas where vortices are easily generated by the ribs 33, and decreasing the pitch P in areas where vortices are not easily formed.

[0032] Furthermore, in order to enhance the synergistic effect between the introduction of the low-temperature fluid into the adjacent section 30 by the twisted surfaces of the aforementioned change sections 41A and 41B and the generation of vortices by the ribs 33, it is preferable that the length L (see Figure 5) of the unit shape formed by the rotation of a square by 90 degrees around axis O is greater than the pitch P of the ribs 33. In this embodiment, 7P <L<9Pとなっている。

[0033] In the embodiment described above, an example was explained in which the square (rectangle) that forms the cross-sectional shape of the flow path 20 rotates clockwise around axis O along the direction of flow of the cooling fluid. However, the direction of rotation may be either clockwise or counterclockwise. Furthermore, the direction of rotation may be the same for all unit shapes of length L, or the direction of rotation may be reversed for each unit shape of length L.

[0034] Furthermore, in order to increase the effect of disrupting the flow of the cooling fluid in the channel 20 and destroying the thermal boundary layer, a slit may be formed at the tip of at least one of the multiple ribs 33, penetrating the rib 33 in the Z direction. For example, a V-shaped slit 34 may be formed in the rib 33 in a front view, as shown in Figure 7A, or a rectangular slit 35 may be formed in the rib 33 in a front view, as shown in Figure 7B. The number of these slits 34 and 35 is not limited to a specific number. Also, these slits 34 and 35 may be combined. Such slits 34 and 35 will generate vortices in the X direction as well, thereby further promoting the generation of turbulence.

[0035] In the embodiments described above, an example was explained in which a square was rotated around axis O to form the change sections 41A and 41B. However, the figure to be rotated does not have to be a square; it may be a rectangle. Thus, the flow path according to the present invention is based on a rectangular cross-sectional shape. Such a flow path may be more advantageous, for example, when the flow path is not filled with liquid and a mixture of gas and liquid is present. This is because, in a mixture of gas and liquid, surface tension attracts the liquid to the four corners of the rectangle, thinning the liquid film in the planar portion and increasing the heat transfer coefficient of the liquid film.

[0036] In the embodiment described above, an example was shown in which a plurality of flow paths 20 are formed in the cooling section 10, but it is sufficient for the cooling section 10 to have at least one flow path 20.

[0037] Even if it is stated in the embodiments described above that component A comprises component B, component B may be arbitrary. Therefore, the present invention encompasses both embodiments in which component A comprises component B and embodiments in which component A does not comprise component B. Furthermore, the effects described in the embodiments described above are not necessarily obtained by the present invention, and effects not described in the embodiments described above may also be obtained by the present invention. The steps or operations described in the embodiments described above may be performed in any order, or simultaneously, unless it is impossible to implement.

[0038] As described above, the cooling device according to the present invention can employ the following configuration. [Configuration 1] A cooling section that is thermally connected to a heating element and has connecting surfaces extending along the width direction and a length direction perpendicular to the width direction, wherein at least one flow path extending along the length direction is formed inside the cooling section. Equipped with, The above at least one flow path is The adjacent portion that is relatively close to the above connection surface, A separated portion that is further away from the connection surface than the aforementioned proximity portion and Includes, The above-mentioned proximity part is, The bottom surface adjacent to the above connection surface, The adjacent sides of the above-mentioned bottom surface extend from both sides in the width direction in the height direction perpendicular to both the width direction and the length direction, Multiple ribs protrude from the bottom surface in the height direction and extend between the adjacent side surfaces. It has, The above separation portion is, A modified section is formed by making two sides continuous in the length direction that connect to the separated vertex, which is the furthest from the base surface among the four vertices of a rectangle that rotates around an axis extending in the length direction according to the position along the length direction. Having, Cooling device.

[0039] [Configuration 2] The cooling device according to configuration 1, wherein the separation portion further has a separation side formed by making a straight line connecting the adjacent vertex of the rectangle adjacent to the separation vertex and the end of the nearby side continuous in the longitudinal direction.

[0040] [Configuration 3] The cooling device according to configuration 2, wherein the adjacent side and the separated side are formed by a continuous, identical surface.

[0041] [Structure 4] The above rectangle is a square, a cooling device according to any of configurations 1 to 3.

[0042] [Composition 5] A cooling device according to any of configurations 1 to 4, wherein each side of the rectangle changes according to its position along the length direction.

[0043] [Composition 6] The cooling device according to any one of configurations 1 to 5, wherein the plurality of ribs are arranged at a constant pitch P along the longitudinal direction.

[0044] [Composition 7] The cooling device according to configuration 6, wherein the length L along the longitudinal direction of the unit shape formed by rotating the rectangle by 90 degrees is greater than the pitch P.

[0045] [Structure 8] Each of the above-mentioned multiple ribs has a height H along the above-mentioned height direction, The ratio P / H of the pitch to the height H is in the range of 3 to 15. The cooling device described in configuration 6 or 7.

[0046] [Composition 9] The cooling device according to any one of configurations 1 to 8, wherein a slit is formed at the tip of at least one of the plurality of ribs, penetrating the at least one rib in the longitudinal direction.

[0047] [Configuration 10] The cooling device according to any one of configurations 1 to 9, wherein the at least one flow path includes a plurality of flow paths arranged side by side in the width direction.

[0048] Although preferred embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to the embodiments described above and may be implemented in various different forms within the scope of its technical concept. [Explanation of Symbols]

[0049] 1 Cooling device 5. Heating element 10 Cooling section 11 End face 12 Connection surface 20 flow channels 30 Proximity section 31 Bottom 32A, 32B Proximity side 33 Ribs 34,35 Slits 40 Separation part 41A, 41B Change section 42A, 42B Separation side S0~S9 square (rectangle) V S1 ~V S8 Vertex (separated vertex) V T1 ~V T6 ,V R4 ~V R8 Vertex (adjacent vertex)

Claims

1. A cooling section that is thermally connected to a heating element and has connecting surfaces extending along the width direction and a longitudinal direction perpendicular to the width direction, wherein at least one flow path extending along the longitudinal direction is formed inside the cooling section. Equipped with, The at least one flow path is The adjacent portion that is relatively close to the aforementioned connection surface, A separation portion that is further away from the connection surface than the proximity portion and Includes, The aforementioned proximity portion is, The bottom surface adjacent to the aforementioned connecting surface, The adjacent side surfaces extending from both sides of the width direction of the bottom surface in a height direction perpendicular to both the width direction and the length direction, Multiple ribs protruding from the bottom surface in the height direction and extending between the adjacent side surfaces It has, The aforementioned separation portion is, A modified portion is formed by making two sides connected in the longitudinal direction to the separated vertex, which is the furthest from the base surface among the four vertices of a rectangle that rotates around an axis extending in the longitudinal direction according to the position along the longitudinal direction. Having, Cooling device.

2. The cooling device according to claim 1, wherein the separation portion further has a separation side formed by making a straight line connecting the adjacent vertex of the rectangle, which is adjacent to the separation vertex, and the end of the nearby side continuous in the longitudinal direction.

3. The cooling device according to claim 2, wherein the adjacent side surface and the separated side surface are formed by a continuous, identical surface.

4. The cooling device according to claim 1, wherein the rectangle is a square.

5. The cooling device according to claim 1, wherein each side of the rectangle changes according to its position along the length direction.

6. The cooling device according to claim 1, wherein the plurality of ribs are arranged at a constant pitch P along the longitudinal direction.

7. The cooling device according to claim 6, wherein the length L along the longitudinal direction of the unit shape formed by rotating the rectangle by 90 degrees is greater than the pitch P.

8. Each of the plurality of ribs has a height H along the height direction, The ratio P / H of the pitch to the height H is in the range of 3 to 15. The cooling device according to claim 6.

9. The cooling device according to claim 1, wherein a slit is formed at the tip of at least one of the plurality of ribs, penetrating the at least one rib in the longitudinal direction.

10. The cooling device according to any one of claims 1 to 9, wherein the at least one flow path includes a plurality of flow paths arranged side by side in the width direction.

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