Cooling device

Abstract

To make compatible both the narrowing of widths of fins and the suppression of the lowering of cooling efficiency, in a self-cooling type cooling device having a plurality of the fins.SOLUTION: A cooling device 1 comprises a heat receiving part 10 for receiving heat from a heat generation body 2 being a cooling object, a long-length heat transport part 20 extending upward from the heat receiving part 10, and a plurality of fins 30 arranged along the heat transport part 20. The fins 30 comprise plate-shaped first portions 31 fixed to the heat transport part 20, plate-shaped second portions 32 continuing to one-side end parts of the first portions 31 while being inclined downward, and plate-shaped third portions 33 continuing to the other end parts of the first portions 31 while being inclined upward. In the second portions 32, distances between the lowest ends and the highest ends of cross sections are longer than plate thicknesses of the second portions 32, and in the third portions 33, distances between the lowest ends and the highest ends of cross sections are longer than plate thicknesses of the third portions 33.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a cooling device. [Background technology]

[0002] Patent Document 1 describes a self-cooling type cooling device that uses natural convection of air to cool a heat source such as a semiconductor element used in electronic devices such as computers, rectifiers for power transformation, or vehicle power supplies. The cooling device disclosed in Patent Document 1 includes a heat receiving block that receives heat from a heat source to be cooled, a plurality of heat pipes connected to the heat receiving block, and a plurality of fins attached to the heat pipes. Each of the plurality of fins in the cooling device disclosed in Patent Document 1 includes a central portion, an air inflow portion, and an air outflow portion each formed in a plate shape. The central portion is attached to the plurality of heat pipes. The air inflow portion is located upstream of the central portion along the air flow. The air outflow portion is located downstream of the central portion along the air flow. In the cooling device disclosed in Patent Document 1, the air inflow portion is attached at an angle with respect to the central portion so that the upstream end is located lower than the downstream end. In addition, in the cooling device disclosed in Patent Document 1, the air outflow portion is attached at an angle with respect to the central portion so that the downstream end is located lower than the upstream end. In the following description, the length of the fins in a direction perpendicular to the air flow in a natural cooling device is referred to as the width of the fin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-108383 A Summary of the Invention [Problem to be solved by the invention]

[0004] When a cooling system is constructed by arranging one self-cooling cooling device for each of a number of heat generating bodies arranged in a row, it is common to arrange each cooling device so that the direction of air flow is perpendicular to the direction in which the heat generating bodies are arranged. In this case, the interval between adjacent heat generating bodies cannot be narrower than the width of the fins, so in order to achieve both miniaturization of the entire system and ensuring cooling performance, it is necessary to narrow the width of each fin so that the interval between the heat generating bodies can be narrowed, and to lengthen the air inlet side and the air outlet side in the direction along the air flow according to the reduction in width in order to suppress the reduction in the area per fin. However, if the air inlet side and the air outlet side are lengthened in the direction along the air flow, the rigidity of the air inlet side and the air outlet side is reduced. If the rigidity of the air inlet side and the air outlet side is reduced, the air inlet side and the air outlet side are deflected, making it difficult for air to flow between the fins, resulting in a problem of reduced cooling efficiency.

[0005] The present disclosure has been made in consideration of the problems described above, and aims to provide a technology that makes it possible to achieve both shortening the width of the fins and suppressing a decrease in cooling efficiency in a self-cooling cooling device equipped with multiple fins. [Means for solving the problem]

[0006] A cooling device according to an embodiment of the present disclosure includes a heat receiving section that receives heat from a heat generating body to be cooled, a long heat transporting section that extends upward from the heat receiving section, and a plurality of fins that are spaced apart from one another and are provided along the heat transporting section. Each of the plurality of fins includes a plate-shaped first portion fixed to the heat transporting section, a plate-shaped second portion that is connected to a first end of the first portion, and a plate-shaped third portion that is connected to a second end of the first portion on the opposite side to the first end. The second portion is inclined so that the third end that is connected to the first portion is located higher than the fourth end on the opposite side. In addition, in the second portion, the distance between the lowermost end of the second portion and the uppermost end of the second portion in a first cross section perpendicular to a first direction from the third end to the fourth end is greater than the plate thickness of the second portion. The third portion is inclined so that the fifth end that is connected to the first portion is located lower than the sixth end on the opposite side. In addition, in the third portion, the distance between the bottom end of the third portion and the top end of the third portion in a second cross section perpendicular to the second direction from the fifth end to the sixth end is greater than the plate thickness of the third portion. [Brief description of the drawings]

[0007] [Figure 1] 1 is a diagram illustrating a configuration example of a cooling device 1 according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a perspective view showing an outline of a fin 30. [Diagram 3] 2 is a schematic diagram showing a side surface of the fin 30 as viewed from the X-axis direction. FIG. [Figure 4] 2 is a diagram showing an example of a cross section Ca1 of a second portion 32. FIG. [Diagram 5] 13 is a diagram showing an example of a cross section Ca2 of a second portion 32. FIG. [Figure 6] 1 is a diagram for explaining the height of an air passage W in the cooling device 1. FIG. [Figure 7] 13 is a diagram showing an example of a cross section Cb1 of a third portion 33. FIG. [Figure 8] 13 is a diagram showing an example of a cross section Cb2 of a third portion 33. FIG. [Figure 9] FIG. 13 is a diagram for explaining a modified example (1). [Figure 10] FIG. 13 is a diagram for explaining a modified example (2). [Figure 11] FIG. 13 is a diagram for explaining a modified example (3). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] 1. Embodiment FIG. 1 is a diagram showing a configuration example of a cooling device 1 according to an embodiment of the present disclosure. The cooling device 1 is a self-cooling type cooling device for cooling a heat generating body 2 such as a semiconductor element used in an AC / DC converter in an electric railway, for example, by using air. Specific examples of the heat generating body 2 include a rectifier diode, a power transistor, and a thyristor. The self-cooling type refers to a method of cooling by utilizing natural convection of air, rather than forced cooling using a blower or the like. As shown in FIG. 1, the cooling device 1 includes a heat receiving part 10, a heat transporting part 20, and a plurality of fins 30. Hereinafter, the vertical direction is referred to as the Z-axis direction. One of the two directions perpendicular to the Z-axis direction is referred to as the X-axis direction, and the other is referred to as the Y-axis direction.

[0009] 1 shows a heating element 2 to be cooled by the cooling element 1 in addition to the cooling device 1. A heat receiving part 10 is disposed so as to be in contact with the heating element 2. The heat receiving part 10 receives heat from the heating element 2. A specific example of the heat receiving part 10 is a solid block made of a material with high thermal conductivity such as aluminum or copper.

[0010] The heat transporting part 20 is a long member extending upward from the heat receiving part 10, that is, in the Z-axis direction. A specific example of the heat transporting part 20 is a solid rod made of aluminum, copper, or the like. The heat transporting part 20 is not limited to a rod-shaped member, and may be a tubular member such as a heat pipe. When the heat transporting part 20 is a tubular member, a hollow member having a space inside for storing a liquid phase refrigerant such as water may be used as the heat receiving part 10, and a vapor path and a liquid path communicating with this space may be provided inside the heat transporting part 20, so that a thermosiphon may be formed by the heat receiving part 10 and the heat transporting part 20.

[0011] The fins 30 are made of aluminum, copper, or the like. As shown in Fig. 1, the multiple fins 30 are provided along the heat transporting part 20 at intervals. In the cooling device 1, the space between two adjacent fins 30 along the heat transporting part 20 becomes an air flow path, i.e., an air passage, for cooling the heat generating body 2. In the cooling device 1, the heat received by the heat receiving part 10 from the heat generating body 2 is transferred to the multiple fins 30 via the heat transporting part 20, and the air flowing through the air passage exchanges heat with the fins 30, so that the heat of the heat generating body 2 is transferred to the air flowing through the air passage, and the heat generating body 2 is cooled.

[0012] FIG. 2 is a perspective view showing an outline of the fin 30. FIG. 3 is a schematic diagram showing an outline of the side of the fin 30 when the fin 30 is viewed from the X-axis direction. As shown in FIG. 2 and FIG. 3, the fin 30 includes a first portion 31, a second portion 32, and a third portion 33. The first portion 31 is formed in a plate shape. When the fin 30 is viewed from the Z-axis direction, the planar shape of the first portion 31 is rectangular, with the side along the X-axis being the short side and the side along the Y-axis being the long side. The fin 30 is fixed to the heat transporting part 20 so that the thickness direction of the first portion 31 is parallel to the Z-axis.

[0013] The first portion 31 is provided with a through hole 313 through which the heat transporting portion 20 passes. The fin 30 is fixed to the heat transporting portion 20 by soldering the first portion 31 to the heat transporting portion 20 along the periphery of the through hole 313 or by press-fitting the heat transporting portion 20 into the through hole 313. In FIG. 2, the central axis of the heat transporting portion 20 is indicated by a two-dot chain line. In this embodiment, the through hole 313 is provided in the center of the first portion 31. The center of the first portion 31 refers to the intersection of a line segment connecting the midpoints of the short sides of the first portion 31 and a line segment connecting the midpoints of the long sides of the first portion 31. As shown in FIG. 2 and FIG. 3, the second portion 32 is connected to an end portion 311, which is one of the short sides of the first portion 31. The end portion 311 is an example of a first end portion in the present disclosure. A third portion 33 is continuous with an end portion 312 opposite to the end portion 311 of the first portion 31, that is, the other short side of the first portion 31. The end portion 312 is an example of a second end portion in the present disclosure.

[0014] The second portion 32 is a long rectangular member. One of the two short sides of the second portion 32, that is, an end portion 321, is connected to the first portion 31. As shown in FIG. 2 and FIG. 3, the second portion 32 is inclined with respect to the first portion 31 so that the other short side, that is, the end portion 321 is located higher than the end portion 322 opposite to the end portion 321. The direction C1 in FIG. 2 is the direction from the end portion 321 to the end portion 322 along the second portion 32, that is, the longitudinal direction of the second portion 32. As shown in FIG. 3, in this embodiment, the inclination angle of the second portion 32 with respect to the first portion 31 is β° (0°<β<180°). The end portion 321 is an example of a third end portion in the present disclosure, and the end portion 322 is an example of a fourth end portion in the present disclosure.

[0015] As shown in FIG. 2, the second portion 32 is folded with the first line La1 and the second line La2 as boundaries. The first line La1 is a line segment extending from one end point of the end portion 321 toward the center of the end portion 322. The second line La2 is a line segment extending from the other end point of the end portion 321 toward the center of the end portion 322. As shown in FIG. 2, the second portion 32 is divided into a central portion 323, a side portion 324, and a side portion 325 by the first line La1 and the second line La2. That is, the second portion 32 includes the central portion 323, the side portion 324, and the side portion 325. The side portion 324 is inclined upward from one side end of the central portion 323, specifically, the side end along the first line La1. The side portion 325 is inclined upward from the other side end of the central portion 323, i.e., the side end along the second line La2. The central portion 323 is an example of a first central portion in the present disclosure. The side portion 324 is an example of a first side portion in the present disclosure, and the side portion 325 is an example of a second side portion in the present disclosure.

[0016] The cross section Ca1 in FIG. 2 is a cross section of the second portion 32 taken along a plane along the line A1-A1 in FIG. 3. The plane along the line A1-A1 in FIG. 3 passes through a position P1 along the air passage W and is perpendicular to the direction C1. The direction C1 is an example of a first direction in the present disclosure. The position P1 is an example of a first position in the present disclosure. The cross section Ca1 is an example of a first cross section in the present disclosure. The cross section Ca2 in FIG. 2 is a cross section of the second portion 32 taken along a plane along the line A2-A2 in FIG. 3. The plane along the line A2-A2 in FIG. 3 passes through a position P2 along the air passage W and is perpendicular to the direction C1. As shown in FIG. 3, the position P2 is closer to the end portion 311 than the position P1, that is, a position downstream of the air passage W. The position P2 is an example of a second position in the present disclosure. The cross section Ca2 is also an example of a first cross section in the present disclosure.

[0017] FIG. 4 is a diagram showing an example of a cross section Ca1. As shown in FIG. 4, in this embodiment, the distance L1 between the bottom end EL and the top end EH in the cross section Ca1 is greater than the plate thickness D1 of the second portion 32. The bottom end EL in the cross section Ca1 is the point located at the lowest position in the cross section Ca1 in the direction of the Z axis. In the example shown in FIG. 4, the bottom end EL is a point at the same height as the lower surface of the central portion 323. The top end EH in the cross section Ca1 is a point located at the highest position in the cross section Ca1 in the direction of the Z axis. In the example shown in FIG. 4, the top end EH is a point at the same height as the side end of the side portion 324 opposite to the side connected to the central portion 323, and the side end of the side portion 325 opposite to the side connected to the central portion 323.

[0018] FIG. 5 is a diagram showing an example of the cross section Ca2. As shown in FIG. 5, the distance L1 between the bottom end EL and the top end EH in the cross section Ca2 is also greater than the plate thickness D1 of the second portion 32. The bottom end EL in the cross section Ca2 is the point located at the lowest position in the cross section Ca2 in the direction of the Z axis. In the example shown in FIG. 5, the bottom end EL is a point at the same height as the lower surface of the central portion 323. The top end EH in the cross section Ca2 is a point located at the highest position in the cross section Ca2 in the direction of the Z axis. In the example shown in FIG. 5, the top end EH is a point at the same height as the side end of the side portion 324 opposite to the side connected to the central portion 323, and the side end of the side portion 325 opposite to the side connected to the central portion 323. By making the distance L1 between the lowermost end EL and the uppermost end EH in the cross sections Ca1 and Ca2 larger than the plate thickness D1 of the second portion 32, the second moment of area of ​​the second portion 32 becomes large and the second portion 32 becomes less likely to flex.

[0019] 4 and 5, the width R1 of the side portion 324 at the position P1 is larger than the width R1 of the side portion 324 at the position P2, and the width R2 of the side portion 325 at the position P1 is larger than the width R2 of the side portion 325 at the position P2. In this embodiment, the second portion 32 is formed in a shape in which the width R1 of the side portion 324 increases and the width R2 of the side portion 325 also increases as the distance from the end portion 321 to the end portion 322 along the second portion 32 increases. This is because the second moment of area of ​​the second portion 32 increases as the distance from the end portion 321 to the end portion 322 along the second portion 32 increases, and the second portion 32 becomes less likely to bend as the distance from the end portion 321 to the end portion 322 along the second portion 32 increases.

[0020] FIG. 6 is a diagram showing an example of a cross section of the fin 30 taken along a plane passing through the side portion 325 and the side portion 335 and perpendicular to the first portion 31, specifically, along a fifth line Lc1 perpendicular to the first portion 31 and indicated by a dashed line in FIG. 2. Point P5 in FIG. 2 is an intersection of the second line La2 and the fifth line Lc1. Point P6 in FIG. 2 is an intersection of the fourth line Lb2 and the fifth line Lc1, which will be described later. FIG. 6 shows a cross section of two fins 30 adjacent to each other along the Z axis. Also, in FIG. 6, the heat transporting part 20 is shown by a dotted line. As shown in FIG. 6, the interval H1 between the side portions 325 of two fins 30 adjacent to each other along the Z axis is wider than the interval H2 between the central portions 323. Similarly, the distance H1 between the side portions 324 of two fins 30 adjacent to each other along the Z axis is also wider than the distance H2 between the central portions 323 of each fin. As described above, the space between two fins 30 adjacent to each other along the Z axis serves as an air flow path, i.e., the air passage W, for cooling the heat generating element 2. In this embodiment, the height of the cross section of the air passage W is higher on the air intake side, so that the intake pressure loss is reduced and the flow rate of air flowing between the fins 30 is increased, improving the cooling performance.

[0021] The third portion 33 is a long rectangular member, similar to the second portion 32. One of the two short sides of the third portion 33, that is, an end portion 331, is connected to the first portion 31. As shown in FIG. 2 and FIG. 3, the third portion 33 is inclined with respect to the first portion 31 so that the other short side, that is, the end portion 331 is located lower than the end portion 332 opposite to the end portion 331. The direction C2 in FIG. 2 is the direction from the end portion 331 to the end portion 332 along the third portion 33, that is, the longitudinal direction of the third portion 33. As shown in FIG. 3, in this embodiment, the angle of inclination of the third portion 33 with respect to the first portion 31 is α° (0°<α<180°). In this embodiment, the angle α and the angle β are the same angle. The end portion 331 is an example of a fifth end portion in this disclosure, and the end portion 332 is an example of a sixth end portion in this disclosure.

[0022] As shown in FIG. 2, the third portion 33 is folded with the third line Lb1 and the fourth line Lb2 as boundaries. The third line Lb1 is a line segment extending from one end point of the end portion 331 toward the center of the end portion 332. The fourth line Lb2 is a line segment extending from the other end point of the end portion 331 toward the center of the end portion 332. As shown in FIG. 2, the third portion 33 is divided into a central portion 333, a side portion 334, and a side portion 335 by the third line Lb1 and the fourth line Lb2. That is, the third portion 33 includes the central portion 333, the side portion 334, and the side portion 335. The side portion 334 is inclined upward from one side end of the central portion 333, specifically, the side end along the third line Lb1. The side portion 335 slopes upward from the other side end of the central portion 333, i.e., the side end along the fourth line Lb2. The central portion 333 is an example of a second central portion in the present disclosure. The side portion 334 is an example of a third side portion in the present disclosure, and the side portion 335 is an example of a fourth side portion in the present disclosure.

[0023] The cross section Cb1 in FIG. 2 is a cross section of the third portion 33 taken along a plane along the A4-A4 line in FIG. 3. The cross section Cb1 passes through a position P4 along the air passage W and is perpendicular to the direction C2. The position P4 is an example of a fourth position in the present disclosure. The cross section Cb1 is an example of a second cross section in the present disclosure. The cross section Cb2 in FIG. 2 is a cross section of the third portion 33 taken along a plane along the A3-A3 line in FIG. 3. The plane along the A3-A3 line passes through a position P3 along the air passage W and is perpendicular to the direction C2. As shown in FIG. 3, the position P3 is located farther from the end portion 312 than the position P4. That is, the position P4 is closer to the end portion 312 than the position P3. The position P3 is an example of a third position in the present disclosure. The cross section Ca2 is also an example of a second cross section in the present disclosure.

[0024] FIG. 7 is a diagram showing an example of a cross section Cb1. As shown in FIG. 7, in this embodiment, a distance L2 between the bottom end EL and the top end EH in the cross section Cb1 is greater than a plate thickness D2 of the third portion 33. The bottom end EL in the cross section Cb1 is a point located at the lowest position in the cross section Cb1 in the direction of the Z axis. In the example shown in FIG. 7, the bottom end EL is a point at the same height as the lower surface of the central portion 333. The top end EH in the cross section Cb1 is a point located at the highest position in the cross section Cb1 in the direction of the Z axis. In the example shown in FIG. 7, the top end EH is a point at the same height as the side end of the side portion 334 opposite to the side connected to the central portion 333, and the side end of the side portion 335 opposite to the side connected to the central portion 333.

[0025] FIG. 8 is a diagram showing an example of the cross section Cb2. As shown in FIG. 8, in this embodiment, the distance L2 between the bottom end EL and the top end EH in the cross section Cb2 is also larger than the plate thickness D2 of the third portion 33. The bottom end EL in the cross section Cb2 is the point located at the lowest position in the cross section Cb2 in the direction of the Z axis. In the example shown in FIG. 8, the point at the same height as the lower surface of the central portion 333 is the bottom end EL. The top end EH in the cross section Cb2 is the point located at the highest position in the cross section Cb2 in the direction of the Z axis. In the example shown in FIG. 8, the point at the same height as the side end of the side portion 334 opposite to the side connected to the central portion 333 and the side end of the side portion 335 opposite to the side connected to the central portion 333 is the top end EH. As shown in FIG. 7 and FIG. 8, in the cross sections Cb1 and Cb2, the distance L2 between the bottom end EL and the top end EH is larger than the plate thickness D2 of the third portion 33. By making the distance L2 between the bottom end EL and the top end EH in each of the cross sections Cb1 and Cb2 larger than the plate thickness D2 of the third portion 33, the second moment of area of ​​the third portion 33 becomes large, making the third portion 33 less likely to flex.

[0026] 7 and 8, the width R3 of the side portion 334 at position P3 is larger than the width R3 of the side portion 334 at position P4, and the width R4 of the side portion 335 at position P3 is larger than the width R4 of the side portion 335 at position P4. In this embodiment, the third portion 33 is formed in a shape such that the width R3 of the side portion 334 increases from the end portion 331 to the end portion 332, and the width R4 of the side portion 335 also increases. This is because the more distant from the end portion 331 to the end portion 332, the larger the second moment of area of ​​the third portion 33 becomes, and the more distant from the end portion 331 to the end portion 332, the more difficult the third portion 33 is to bend.

[0027] 7 and 8, in this embodiment, airflow W1 from the central portion 333 to the side portion 334 and airflow W2 from the central portion 333 to the side portion 335 are generated, so that air that has already exchanged heat can escape from the fins 30 more easily and cooling efficiency is improved compared to the embodiment in which the third portion 33 is formed in a flat plate shape. This is because the more air that has already exchanged heat escapes from the fins 30, the more air that flows into the fins 30 by natural convection, i.e., the amount of air that exchanges heat with the fins 30, increases.

[0028] As described above, according to the cooling device 1 of the present embodiment, it is possible to shorten the width of the fins while suppressing a decrease in cooling efficiency.

[0029] 2. Transformation The above-described embodiment may be modified as follows. 9, the angle α of inclination of the third portion 33 with respect to the first portion 31 may be smaller than the angle β of inclination of the second portion 32 with respect to the first portion 31. By making the angle α of inclination of the third portion 33 with respect to the first portion 31 smaller than the angle β of inclination of the second portion 32 with respect to the first portion 31, that is, by making the inclination of the third portion 33 with respect to the first portion 31 steeper than the inclination of the second portion 32 with respect to the first portion 31, the air that has undergone heat exchange can be evacuated more easily. The better the air that has undergone heat exchange can be evacuated from between the fins 30, the more the amount of air that flows into between the fins 30 along the second portion 32 increases, and therefore the cooling performance of the cooling device 1 is improved.

[0030] (2) Either the side portion 324 or the side portion 325 of the second portion 32 may be omitted. In addition, the second portion 32 may be formed by bending a plate-like member 340 shown in Fig. 10 along a sixth line Lc2, which is one of the two diagonal lines.

[0031] (3) In the above embodiment, the first line La1 is a line segment extending from one end point of the end 321 to the center of the end 322, and the second line La2 is a line segment extending from the other end point of the end 321 to the center of the end 322. However, the starting point of the first line La1 is not limited to one end point of the end 321, and may be a point on one of the two long sides of the long rectangular member constituting the second portion 32 that is in contact with the end point. Similarly, the starting point of the second line La2 is not limited to the other end point of the end 321, and may be a point on the other of the two long sides. As shown in FIG. 11, if the inclination angles of bending along the first line La1 and the second line La2 are the same, the shorter the first line La1 and the second line La2 are, the greater the effect of enlarging the interval H1 with respect to the interval H2.

[0032] (4) The heating element 2 to be cooled by the cooling device 1 is not limited to a semiconductor element used in an AC / DC converter in an electric railway. The heating element 2 may be a semiconductor element such as a diode or transistor used in an electronic device such as a computer, a household electric appliance, or a rectifier for a transformer, or may be a processor such as a GPU (Graphics Processing Unit) or a CPU (Central Processing Unit), i.e., an integrated circuit.

[0033] 3. Aspects understood from each embodiment and modification The present disclosure is not limited to the above-described embodiments and modifications, and can be realized in various aspects without departing from the spirit of the present disclosure. For example, the present disclosure can also be realized in the following aspects. The technical features in the above-described embodiments corresponding to the technical features in each aspect described below can be replaced or combined as appropriate to solve some or all of the problems of the present disclosure or to achieve some or all of the effects of the present disclosure. Furthermore, if a technical feature is not described in this specification as essential, it may be deleted as appropriate.

[0034] A cooling device according to one aspect of the present disclosure includes a heat receiving section that receives heat generated by a heat generating body to be cooled, a long heat transporting section that extends upward from the heat receiving section, and a plurality of fins that are spaced apart from each other and are provided along the heat transporting section. The second section is inclined so that a third end connected to the first section is located higher than a fourth end on the opposite side. In the second section, the distance between the lowermost end and the uppermost end in a first cross section perpendicular to a first direction from the third end to the fourth end is greater than the plate thickness of the second section. The third section is inclined so that a fifth end connected to the first section is located lower than a sixth end on the opposite side. In the third section, the distance between the lowermost end and the uppermost end in a second cross section perpendicular to a second direction from the fifth end to the sixth end is greater than the plate thickness of the third section. In the cooling device according to this aspect, the second moment of area of ​​the second section and the third section is large, and the second section and the third section are less likely to bend. Therefore, according to the cooling device of this aspect, even if the second and third parts are lengthened along the air passage to shorten the fin width while keeping the fin area constant, the spacing between the fins can be kept constant and a decrease in cooling efficiency can be suppressed. In other words, according to the cooling device of this aspect, in a self-cooling type cooling device equipped with multiple fins, it is possible to achieve both a decrease in the fin width and a decrease in cooling efficiency.

[0035] In a more preferred embodiment, the second portion in the cooling device may include, in a first cross section, a first central portion, a first side portion inclined upward from one side end of the first central portion, and a second side portion inclined upward from the other side end of the first central portion. According to this embodiment, the cooling efficiency is improved compared to an embodiment in which the second portion is a flat plate.

[0036] In a further preferred embodiment of the cooling device, the width of the first side portion at a first position in the first direction may be greater than the width of the first side portion at a second position closer to the first portion than the first position, and the width of the second side portion at the first position may be greater than the width of the second side portion at the second position. According to this embodiment, the second moment of area of ​​the second portion increases from the third end along the second portion toward the fourth end, so that the second portion becomes less likely to bend from the third end along the second portion toward the fourth end.

[0037] In another preferred embodiment of the cooling device, the third portion may include, in the second cross section, a second central portion, a third lateral portion inclined upward from one side end of the second central portion, and a fourth lateral portion inclined upward from the other side end of the second central portion. According to this embodiment, compared to an embodiment in which the third portion is a flat plate, the air that has undergone heat exchange can escape more easily from the fins, improving the cooling efficiency.

[0038] In a further preferred embodiment of the cooling device, the width of the third side portion at a third position in the second direction may be greater than the width of the third side portion at a fourth position closer to the first portion than the third position, and the width of the fourth side portion at the third position may be greater than the width of the fourth side portion at the fourth position. According to this embodiment, the second moment of area of ​​the third portion increases from the fifth end toward the sixth end along the third portion, so that the third portion becomes less likely to bend from the fifth end toward the sixth end along the third portion.

[0039] In another preferred embodiment of the cooling device, in each of the plurality of fins, the angle of inclination of the third portion relative to the first portion may be smaller than the angle of inclination of the second portion relative to the first portion. Since the angle of inclination of the third portion relative to the first portion is smaller than the angle of inclination of the second portion relative to the first portion, the element cooling device of this embodiment makes it possible to efficiently exhaust air that has undergone heat exchange, improving cooling performance. [Explanation of symbols]

[0040] 1...Cooling device, 10...Heat receiving part, 20...Heat transport part, 30...Fin, 31...First part, 32...Second part, 33...Third part, 311,312,321,322,331,332...End part, 313...Through hole, 323, 333...Central part, 324,325,334,335...Side part, 2...Heating element.

Claims

1. a heat receiving portion that receives heat from a heating element to be cooled; a long heat transporting part extending upward from the heat receiving part; a plurality of fins provided along the heat transporting portion at intervals from each other; Each of the plurality of fins is a plate-shaped first portion fixed to the heat transporting portion; a plate-shaped second portion connected to a first end of the first portion; a plate-shaped third portion connected to a second end portion of the first portion opposite to the first end portion, The second portion is a third end portion connected to the first portion is inclined so as to be located higher than a fourth end portion on the opposite side, and a distance between a lowermost end of the second portion and an uppermost end of the second portion in a first cross section perpendicular to a first direction from the third end portion toward the fourth end portion is larger than a plate thickness of the second portion; The third portion is A fifth end portion connected to the first portion is inclined so as to be located lower than a sixth end portion on the opposite side, and a distance between a lowermost end of the third portion and an uppermost end of the third portion in a second cross section perpendicular to a second direction from the fifth end portion toward the sixth end portion is greater than a plate thickness of the third portion. Cooling device.

2. The second portion includes, in the first cross section, a first central portion, a first lateral portion inclined upward from one side end of the first central portion, and a second lateral portion inclined upward from the other side end of the first central portion. The cooling device according to claim 1 .

3. a width of the first side portion at a first position in the first direction is greater than a width of the first side portion at a second position closer to the first portion than the first position; a width of the second side portion at the first position is greater than a width of the second side portion at the second position; The cooling device according to claim 2.

4. the third portion includes, in the second cross section, a second central portion, a third lateral portion inclined upward from one side end of the second central portion, and a fourth lateral portion inclined upward from the other side end of the second central portion; A cooling device according to any one of claims 1 to 3.

5. a width of the third side portion at a third position in the second direction is greater than a width of the third side portion at a fourth position closer to the first portion than the third position; a width of the fourth side portion at the third position is greater than a width of the fourth side portion at the fourth position; The cooling device according to claim 4.

6. In each of the plurality of fins, an angle of inclination of the third portion with respect to the first portion is smaller than an angle of inclination of the second portion with respect to the first portion.

6. The cooling device according to claim 1, wherein the cooling device is a cooling device having a cooling mechanism.

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