Heat radiation body and box-shaped body

Abstract

To provide a heat radiation body having an excellent heat radiation performance.SOLUTION: A heat radiation body 30 that radiates heat generated by a heat source includes: a base portion 32 to which the heat is transferred; a plurality of heat radiation fins 37a, 37b, 37c provided on the base portion 32 and extending in a predetermined extending direction; and wall portions 35, 34a, 34b adjacent to the plurality of the heat radiation fins 37a, 37b, 37c in the extending direction. The plurality of heat radiation fins 37a, 37b, 37c include two or more heat radiation fins 37a, 37b, 37c configured such that intervals between the heat radiation fins 37a, 37b, 37c and the wall portions 35, 34a, 34b in the extending direction increase toward one end of the wall portions 35, 34a, 34b in an intersecting direction intersecting the extending direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a heat radiator that radiates heat generated by a heat source, and a box-shaped body that includes the heat radiator as at least a part of its outer wall. [Background technology]

[0002] Electrical junction boxes mounted on vehicles, etc. have been proposed for some time. For example, one conventional electrical junction box accommodates electronic components, bus bars, etc. in its internal space to prevent accidental contact with these electronic components, etc. (See, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-240217 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-described type of electrical junction box may include heat dissipation fins for dissipating heat generated by electronic components during operation to the outside. However, if a power input terminal, which electrically connects the inside and outside of the electrical junction box for power supply, is located near the heat dissipation fins, the power input terminal itself or a base portion to which the power input terminal is fixed may obstruct the airflow along the heat dissipation fins, thereby impairing the heat dissipation performance of the electrical junction box. From the perspective of ensuring proper operation of the electrical junction box, it is desirable to improve the heat dissipation performance of the electrical junction box. As can be understood from the above description, it is desirable to improve the heat dissipation performance not only in electrical junction boxes but also in box-shaped structures capable of accommodating a heat source within its internal space. For these reasons, a heat dissipator with excellent heat dissipation performance that can be applied to box-shaped structures is desired.

[0005] An object of the present invention is to provide a heat sink having excellent heat dissipation performance, and a box-shaped body using the heat sink. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the heat sink and box-shaped body according to the present invention have the following features.

[0007] A heat sink that dissipates heat generated by a heat source, a base portion to which the heat is transferred; a plurality of heat dissipation fins provided on the base portion and extending in a predetermined extension direction; and a wall portion adjacent to the plurality of heat dissipation fins in the extension direction; The plurality of heat dissipation fins include: The heat dissipation fins include two or more heat dissipation fins configured such that the distance between each heat dissipation fin and the wall portion in the extension direction increases as the distance approaches one end of the wall portion in a cross direction intersecting the extension direction. It must be a heat dissipator.

[0008] A box-shaped body capable of accommodating a heat source in an internal space, The above-mentioned heat dissipation body is provided as at least a part of the outer wall of the box-shaped body. It is box-shaped. [Effects of the Invention]

[0009] According to the heat sink of the present invention, the distance between a wall portion adjacent to the plurality of heat dissipating fins and at least some of the plurality of heat dissipating fins (i.e., two or more heat dissipating fins) increases as the distance approaches one end of the wall portion. As a result, when air flows from the flow path between the two or more heat dissipating fins into the region between the wall portion and the two or more heat dissipating fins, the region with the wider distance generally has a lower pressure than the region with the narrower distance, so the air flows from the region with the narrower distance toward the region with the wider distance (i.e., toward the one end of the wall portion). In other words, the air does not simply collide with the wall portion, but is guided to flow around the one end of the wall portion. Therefore, even if a wall portion is present near the heat dissipating fins, the air flow is unlikely to be obstructed by the wall portion. Therefore, even when the wall portion and the heat dissipating fins are closely arranged, such as when the wall portion and the heat dissipating fins are integrally formed on a base for fixing a power input terminal, the heat dissipation fins can efficiently dissipate heat. Therefore, the heat sink of the present invention has excellent heat dissipation performance.

[0010] According to the box-shaped body of the present invention, by providing the above-mentioned heat dissipation body as at least a part of the outer wall of the box-shaped body, the heat generated by the heat source inside the box-shaped body can be efficiently dissipated to the outside of the box-shaped body. Therefore, the box-shaped body of the present invention has excellent heat dissipation performance.

[0011] The present invention has been briefly described above. The details of the present invention will become more apparent from the detailed description of the invention set forth below, taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing a box-shaped body according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of the box-shaped body shown in FIG. 1 as seen from the rear side. [Figure 3] FIG. 3 is an exploded perspective view of the box-shaped body shown in FIG. [Figure 4]FIG. 4 is an enlarged top view of part A in FIG. [Figure 5] 5 is a perspective view of the periphery of the base portion and the bolt mounting portion included in part A in FIG. 3, as viewed obliquely from below and behind. DETAILED DESCRIPTION OF THE INVENTION

[0013] <Embodiment> Hereinafter, a box-shaped body 1 according to an embodiment of the present invention will be described with reference to the drawings. The box-shaped body 1 accommodates various electronic components such as relays and fuses inside, and therefore can also be called an electronic component unit or an electrical junction box.

[0014] As shown in Figures 1 to 3, the box-shaped body 1 includes a circuit board 10, and a cover 20 and a case 30 that are arranged to sandwich the circuit board 10 from above and below and define an internal storage space for storing the circuit board 10. The box-shaped body 1 is typically attached to a dash panel that separates the engine room and passenger compartment (cabin) of a vehicle, and is used with the cover 20 exposed to the engine room of the vehicle. The case 30 corresponds to the "case" of the present invention, and the cover 20 corresponds to the "cover" of the present invention.

[0015] For the sake of convenience, the following definitions are used for the "front-rear direction," "up-down direction," "left-right direction," "front," "rear," "up," "down," "left," and "right" as shown in FIG. 1 and elsewhere. The "front-rear direction," "up-down direction," and "left-right direction" are perpendicular to one another. The up-down direction corresponds to the "direction in which the heat dissipation fins extend" in the present invention, and the left-right direction corresponds to the "direction intersecting the direction in which the heat dissipation fins extend" in the present invention. As will be described later, from the perspective of smoothly flowing air along the heat dissipation fins 37, it is preferable that the "up-down direction" in this example coincides with the up-down direction of the vehicle or the like when the box-shaped body 1 is mounted on the vehicle or the like. However, the "up-down direction" in this example does not necessarily correspond to the up-down direction of the vehicle or the like when the box-shaped body 1 is mounted on the vehicle or the like. Below, each component constituting the box-shaped body 1 will be described.

[0016] First, we will explain the circuit board 10. The circuit board 10 is a printed circuit board (PCB) on which various electronic components (not shown), such as relays and fuses, are mounted, and in this example, has a rectangular flat plate shape as shown in FIG.

[0017] Next, the cover 20 will be described. The cover 20 is a resin molded body and has a generally rectangular flat plate shape as shown in FIG. 3. The cover 20 constitutes a part of the outer wall of the box-shaped body 1. A connector portion 21 having a cylindrical portion extending forward (toward the outside of the box-shaped body 1) is provided at each of a plurality of locations on the front surface of the cover 20 (the surface exposed to the outside of the box-shaped body 1). Each connector portion 21 houses a metal terminal (not shown) electrically connected to a corresponding electronic component mounted on the circuit board 10. Each connector portion 21 is fitted with a mating connector (not shown) connected to an end of an electric wire extending from a device (not shown) outside the box-shaped body 1. As a result, each connector portion 21 functions to electrically connect the electronic component mounted on the circuit board 10 inside the box-shaped body 1 with the device outside the box-shaped body 1. Each connector portion 21 can be fitted with a mating connector in a watertight manner and has a waterproof function that can prevent water from entering from the outside when fitted with the mating connector. At each of the four corners of the periphery of the cover 20, a bolt insertion hole 22 is provided that penetrates the cover 20 in the thickness direction (front-rear direction).

[0018] Next, the case 30 will be described. The case 30 is made of metal (more specifically, aluminum die-cast) and functions as a heat sink, absorbing heat generated by various electronic components mounted on the circuit board 10 and releasing it to the outside. In this example, as shown in FIG. 3 , the case 30 has a generally rectangular box-like shape with an open front end, and integrally includes a generally rectangular cylindrical peripheral wall 31 extending in the front-rear direction and a generally rectangular flat bottom wall 32 closing the rear end opening of the peripheral wall 31. The case 30 (= peripheral wall 31 + bottom wall 32) forms a part of the outer wall of the box-shaped body 1. The circuit board 10 is placed on the inner surface (front surface) of the bottom wall 32 and fixed thereto by fastening or the like. Here, the case 30 corresponds to the "heat sink" of the present invention, and the bottom wall 32 corresponds to the "base" of the present invention.

[0019] A generally rectangular, annular recessed streak 33 is formed in the end face of the generally rectangular frame-shaped opening (front side) of the peripheral wall 31. The recessed streak 33 is recessed rearward and extends circumferentially around the entire circumference of the peripheral wall 31. A sealing material (e.g., a liquid gasket) is poured into the recessed streak 33. As shown in FIG. 2 and other figures, bolt mounting portions 34 having an outer shape that protrudes from the bottom wall 32 to the rear (outside the box-shaped body 1) are provided in the peripheral wall 31 and bottom wall 32 at each of the four corners of the periphery of the case 30, corresponding to each of the four bolt insertion holes 22 of the cover 20. A female thread is formed inside the bolt mounting portion 34 and opens to the front (toward the cover 20). The cover 20 is placed on the end surface of the peripheral wall 31 on the opening side so as to close the front-end opening of the case 30. The cover 20 is fastened to the case 30 by threading bolts (not shown) inserted through the bolt insertion holes 22 into the corresponding female threads of the bolt mounting portions 34. When the cover 20 is completely assembled to the case 30, the sealant injected into the grooves 33 seals the gap between the peripheral edges of the fixed cover 20 and case 30, thereby preventing water from entering the box-shaped body 1 from the outside to the inside. Hereinafter, for ease of explanation, of the four bolt mounting portions 34, the one located at the upper right corner of the case 30 will be referred to as the "bolt mounting portion 34a," and the one located at the upper left corner of the case 30 will be referred to as the "bolt mounting portion 34b." The bolt mounting portions 34 can also be used as locations for attaching a jig (a so-called bracket) for mounting the box-shaped body 1 on a vehicle or the like.

[0020] As shown in FIGS. 2 to 4 , a pedestal 35 having an outer shape that protrudes rearward (outside the box-shaped body 1) from the bottom wall 32 is provided on the peripheral wall 31 and bottom wall 32 at a position on the upper edge extending in the left-right direction of the case 30, adjacent to the left side of the bolt mounting portion 34a. A power input terminal 36 electrically connected to various electronic components mounted on the circuit board 10 is fixed to the pedestal 35. A mating terminal (not shown) provided at the end of an electric wire extending from a power source (not shown) external to the box-shaped body 1 is connected to the power input terminal 36. As a result, power supplied from the power source is supplied to the various electronic components mounted on the circuit board 10 via the power input terminal 36. Here, the bolt mounting portions 34a and 34b correspond to the "wall portion" and "mounting portion" of the present invention, and the pedestal 35 corresponds to the "wall portion" and "pedestal" of the present invention.

[0021] 2 and other figures, a plurality of heat dissipation fins 37 are provided on the substantially rectangular rear surface (outer surface of the box-shaped body 1) of the bottom wall 32 of the case 30, excluding the areas where convex portions such as the four bolt mounting portions 34 and the pedestal portion 35 protruding outward (rearward) from the bottom wall 32 are arranged, extending vertically and equidistantly in the left-right direction. The heat dissipation fins 37 improve the heat dissipation performance of the case 30, which functions as a heat sink.

[0022] For ease of explanation, of the multiple heat dissipation fins 37, the multiple (seven in this example) fins located at the bottom of the base portion 35 protruding outward from the upper edge of the bottom wall portion 32 and arranged adjacent to (facing) the underside of the base portion 35 in the vertical direction will be referred to as "heat dissipation fins 37a" (see Figures 2 and 5), the multiple (three in this example) fins located at the bottom of the bolt mounting portion 34a protruding outward from the upper edge of the bottom wall portion 32 and arranged adjacent to (facing) the underside of the bolt mounting portion 34a in the vertical direction will be referred to as "heat dissipation fins 37b" (see Figures 2 and 5), and the multiple (three in this example) fins located at the bottom of the bolt mounting portion 34b protruding outward from the upper edge of the bottom wall portion 32 and arranged adjacent to (facing) the underside of the bolt mounting portion 34b in the vertical direction will be referred to as "heat dissipation fins 37c" (see Figure 2).

[0023] The upper ends of the seven heat dissipation fins 37a are close to the underside of the base 35, but their positions in the up-down direction are different from one another. Specifically, as shown in Figures 2 and 5, the upper ends of the seven heat dissipation fins 37a are arranged so that the upper end of the heat dissipation fin 37a located at the center of the base 35 in the left-right direction is located at the top, and the upper ends of the heat dissipation fins 37a are located lower as the position of the heat dissipation fin 37a moves from the center of the base 35 to both left and right ends in the left-right direction. In other words, the region Sa between the seven heat dissipation fins 37a and the base 35 in the up-down direction is configured so that the vertical spacing of the region Sa increases as the position moves from the center of the base 35 to both left and right ends in the left-right direction.

[0024] The upper ends of the three heat dissipation fins 37b are close to the underside of the bolt mounting portion 34a, but their positions in the up-down direction are different from one another. Specifically, as shown in Figures 2 and 5, the upper ends of the three heat dissipation fins 37b are arranged so that the upper end of the heat dissipation fin 37b located at the left end of the bolt mounting portion 34a in the left-right direction is the highest, and the upper ends of the heat dissipation fins 37b are positioned lower as the position of the heat dissipation fin 37b approaches the right end of the bolt mounting portion 34a in the left-right direction. In other words, the vertical spacing of the region Sb between the three heat dissipation fins 37b and the bolt mounting portion 34a in the up-down direction increases as the position of the heat dissipation fin 37b approaches the right end of the bolt mounting portion 34a in the left-right direction.

[0025] The upper ends of the three heat dissipation fins 37c are close to the underside of the bolt mounting portion 34b, but their positions in the up-down direction are different from one another. Specifically, as shown in Fig. 2, the upper ends of the three heat dissipation fins 37c are arranged so that the upper end of the heat dissipation fin 37c located at the right end of the bolt mounting portion 34b in the left-right direction is located at the top, and the upper ends of the heat dissipation fins 37c are positioned lower as the position of the heat dissipation fin 37c approaches the left end from the right end of the bolt mounting portion 34b in the left-right direction. In other words, the vertical spacing of the region Sc (see Fig. 2) between the three heat dissipation fins 37c and the bolt mounting portion 34b in the up-down direction increases as the position of the region Sc approaches the left end from the right end of the bolt mounting portion 34b in the left-right direction.

[0026] The effect of configuring the vertical spacing of the regions Sa, Sb, and Sc as described above will be described below. Heat generated from the various electronic components mounted on the circuit board 10 is absorbed by the peripheral wall 31 and bottom wall 32 of the case 30, which function as a heat sink, and is released to the outside through the outer surfaces of the peripheral wall 31 and bottom wall 32. At this time, the air present in the gaps between the plurality of heat dissipation fins 37 receives the heat released from the bottom wall 32 and the outer surfaces of the heat dissipation fins 37, and therefore its temperature becomes higher than that of the surrounding air (i.e., its density becomes relatively lower), and so it flows upward along the heat dissipation fins 37 extending in the vertical direction.

[0027] Of the multiple heat dissipation fins 37, air flowing upward through the gaps between the heat dissipation fins 37 other than the heat dissipation fins 37a, 37b, and 37c (i.e., the heat dissipation fins 37 that do not have convex portions such as the bolt mounting portion 34 and the base portion 35 above the heat dissipation fins 37) can move upward from the upper end of the heat dissipation fins 37 (i.e., above the box-shaped body 1) without being obstructed from flowing upward.

[0028] On the other hand, air flowing upward through the gaps between the heat dissipation fins 37a may be prevented from flowing upward from the upper ends of the heat dissipation fins 37a due to collision with the base 35 or the like. In this regard, in this example, the region Sa between the seven heat dissipation fins 37a and the base 35 is configured so that the vertical spacing of the region Sa increases as the region approaches the center of the base 35 in the horizontal direction and the left and right ends, as described above. Therefore, as shown in FIG. 5 , when air flowing upward through the gaps between the heat dissipation fins 37a flows into the region Sa, the pressure is generally lower in the wider vertical spacing of the region Sa than in the narrower vertical spacing, and the air flows toward the wider vertical spacing of the region Sa. Specifically, air that flows into the region Sa to the left of the center of the base 35 in the horizontal direction does not simply flow to collide with the base 35, but is guided to flow around the left end of the base 35, as indicated by the white arrow in the figure. Similarly, air that flows into area Sa to the right of the center of base 35 in the left-right direction does not simply collide with base 35, but is guided to flow around the right end of base 35, as shown by the white arrow in the figure. Therefore, even if base 35 is present near the upper ends of heat dissipation fins 37a, the upward flow of air that has flowed into area Sa is unlikely to be impeded, and heat dissipation performance is unlikely to be impaired.

[0029] Similarly, air flowing upward through the gaps between the heat dissipation fins 37b may be blocked from the upper end of the heat dissipation fins 37b due to collision with the bolt mounting portion 34a or other factors. In this embodiment, the region Sb between the three heat dissipation fins 37b and the bolt mounting portion 34a is configured such that the vertical spacing of the region Sb increases as the region approaches the left end of the bolt mounting portion 34a in the left-right direction. Therefore, as shown in FIG. 5 , when air flowing upward through the gaps between the heat dissipation fins 37b enters the region Sb, the pressure is generally lower in the wider vertically spaced regions of the region Sb than in the narrower vertically spaced regions. Specifically, the air flowing into the region Sb does not simply collide with the bolt mounting portion 34a, but is instead guided around the right end of the bolt mounting portion 34a, as indicated by the white arrow in the figure. Therefore, even if the bolt attachment portion 34a is present near the upper end of the heat dissipation fin 37b, the upward flow of air that has flowed into the region Sb is not easily impeded, and therefore the heat dissipation performance is not easily impeded.

[0030] Similarly, air flowing upward through the gaps between the heat dissipation fins 37c may be prevented from flowing upward from the upper end of the heat dissipation fins 37c due to collision with the bolt mounting portion 34b, etc. In this regard, in this example, the region Sc between the three heat dissipation fins 37c and the bolt mounting portion 34b is configured such that the vertical spacing of the region Sc increases as the region approaches the right end of the bolt mounting portion 34b in the left-right direction, as described above. Therefore, when air flowing upward through the gaps between the heat dissipation fins 37c flows into the region Sc, the wider vertical spacing of the region Sc is generally at a lower pressure than the narrower vertical spacing, and the air flows toward the wider vertical spacing of the region Sc. Specifically, the air flowing into the region Sc does not simply collide with the bolt mounting portion 34b, but is instead guided around the left end of the bolt mounting portion 34b, as indicated by the white arrow in the figure. Therefore, even if the bolt attachment portion 34b is present near the upper end of the heat dissipation fin 37c, the upward flow of air that has flowed into the area Sc is not easily impeded, and therefore the heat dissipation performance is not easily impeded.

[0031] <Actions and Effects> As described above, according to the heat sink (case 30) and box-shaped body 1 of this embodiment, the distance between at least a portion of the multiple heat dissipation fins 37a, 37b, 37c (i.e., two or more heat dissipation fins 37a, 37b, 37c) and the wall portion (base portion 35, bolt mounting portions 34a, 34b) arranged adjacent to the heat dissipation fins 37a, 37b, 37c in the extension direction (up-down direction) in which the multiple heat dissipation fins 37a, 37b, 37c extend becomes wider as it approaches one end of the wall portion 35, 34a, 34b in the intersecting direction (left-right direction). As a result, when air flows from the flow paths between the two or more heat dissipation fins 37a, 37b, 37c into the regions Sa, Sb, Sc between the heat dissipation fins 37a, 37b, 37c and the walls 35, 34a, 34b, the pressure is generally lower in the regions with wider gaps than in the regions with narrower gaps. Therefore, the air flows toward the regions with wider gaps (i.e., toward one end of the walls 35, 34a, 34b). In other words, the air does not simply collide with the walls 35, 34a, 34b, but is guided to flow around one end of the walls 35, 34a, 34b. Therefore, even if the walls 35, 34a, 34b are located near the heat dissipation fins 37a, 37b, 37c, the air flow is not easily obstructed. Therefore, even when the heat dissipation fins 37a, 37b, and 37c are arranged in close contact with the base 35 that fixes the power input terminal 36 and the wall portions used for the bolt mounting portions 34a and 34b, as in this example, heat can be efficiently dissipated from the heat dissipation fins 37a, 37b, and 37c. Therefore, the heat dissipation body 30 and the box-shaped body 1 according to this embodiment have excellent heat dissipation performance.

[0032] Furthermore, two or more heat dissipation fins 37a are configured so that the spacing between them increases as they move from the center to one end of the wall 35, and the other two or more heat dissipation fins 37a are configured so that the spacing between them increases as they move from the center to the other end of the wall 35. As a result, air that flows into the region between the heat dissipation fins 37a and the wall 35 is guided by dividing it into two flows: one that goes around one end of the wall 35 and one that goes around the other end of the wall 35. Therefore, compared to when all the air is guided to go around one end of the wall 35, the air can flow more smoothly, further improving the heat dissipation performance of the heat sink 30.

[0033] Furthermore, since there is another wall portion (bolt mounting portion 34a) located adjacent to the wall portion (base portion 35) in a direction (left-right direction) intersecting the extension direction of the heat dissipation fins 37a, 37b, 37c, even if it is difficult for the air flowing along the heat dissipation fin 37a to flow around the wall portion 35, the air is guided to flow around one end of the wall portions 35, 34a, thereby improving the heat dissipation performance of the heat sink 30.

[0034] <Other aspects> It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and modifications, improvements, etc. are possible as appropriate. Furthermore, the material, shape, dimensions, number, location, etc. of each component in the above-described embodiments are arbitrary as long as they can achieve the present invention, and are not limited thereto.

[0035] 5, the vertical length of the heat dissipation fins 37a decreases toward the left and right ends of the wall 35, thereby increasing the vertical spacing of the region Sa. Alternatively, the heat dissipation fins 37a and the wall 35 may be configured so that the length of the heat dissipation fins 37a is the same and the lower surface of the wall 35 is inclined away from the heat dissipation fins 37a toward the left and right ends of the wall 35, thereby increasing the vertical spacing of the region Sa.

[0036] Here, the features of the embodiments of the heat sink 30 and the box-shaped body 1 according to the present invention described above will be briefly summarized and listed below in [1] to [6].

[0037] [1] A heat sink (30) that dissipates heat generated by a heat source, the heat dissipation device comprises: a base (32) to which the heat is transferred; a plurality of heat dissipation fins (37a, 37b, 37c) provided on the base (32) and extending in a predetermined extension direction; and wall portions (35, 34a, 34b) adjacent to the plurality of heat dissipation fins (37a, 37b, 37c) in the extension direction; The plurality of heat dissipation fins (37a, 37b, 37c) are the heat dissipation fins (37a, 37b, 37c) are configured so that the distance between each heat dissipation fin (37a, 37b, 37c) and the wall portion (35, 34a, 34b) in the extension direction increases as the distance approaches one end of the wall portion (35, 34a, 34b) in a cross direction intersecting the extension direction, Heat sink (30).

[0038] According to the heat sink having the configuration [1] above, the distance between the wall portion adjacent to the plurality of heat dissipating fins and at least some of the plurality of heat dissipating fins (i.e., two or more heat dissipating fins) increases as the distance approaches one end of the wall portion. As a result, when air flows from the flow path between the two or more heat dissipating fins into the region between the wall portion and the two or more heat dissipating fins, the region with the wider distance generally has a lower pressure than the region with the narrower distance, so the air flows from the region with the narrower distance toward the region with the wider distance (i.e., toward one end of the wall portion). In other words, the air does not simply collide with the wall portion, but is guided to flow around the one end of the wall portion. Therefore, even if a wall portion is present near the heat dissipating fins, the air flow is less likely to be obstructed by the wall portion. Therefore, even when the wall and the heat dissipation fins are closely arranged, such as when the wall and the heat dissipation fins are integrally formed on the base, the heat dissipation unit can efficiently dissipate heat. Therefore, the heat dissipation unit of this configuration has excellent heat dissipation performance.

[0039] [2] In the heat sink (30) described in [1] above, The plurality of heat dissipation fins (37a) are two or more heat dissipation fins (37a) configured such that the spacing between them increases as they approach one end from the center of the wall portion (35) in the cross direction, and two or more other heat dissipation fins (37a) configured such that the spacing between them increases as they approach the other end from the center of the wall portion (35) in the cross direction, Heat sink (30).

[0040] According to the heat sink having the configuration [2] above, two or more heat sink fins are configured so that the spacing between them increases as they move from the center of the wall to one end, and two or more other heat sink fins are configured so that the spacing between them increases as they move from the center of the wall to the other end. As a result, air that flows into the area between the heat sink fins and the wall is divided into two flows that go around one end of the wall and another that go around the other end of the wall. This allows the air to flow more smoothly than when all the air is guided to go around one end of the wall, further improving the heat dissipation performance of the heat sink.

[0041] [3] The heat sink (30) according to the above [1], Further, another wall portion (34a) is provided at a position adjacent to the wall portion (35) in the crossing direction. Heat sink (30).

[0042] According to the heat sink having the configuration [3] above, even if the air flowing along the heat sink fins has difficulty flowing around the wall due to the presence of another wall adjacent to the wall, the air can pass through the through holes in the wall, thereby improving the heat dissipation performance of the heat sink.

[0043] [4] A box-shaped body (1) capable of accommodating a heat source in its internal space, The heat dissipation body (30) according to any one of [1] to [3] above is provided as at least a part of the outer wall of the box-shaped body (1). Box (1).

[0044] According to the box-shaped body of the configuration [4] above, by providing the heat dissipation body as at least a part of the outer wall of the box-shaped body, the heat generated by the heat source inside the box-shaped body can be efficiently dissipated to the outside of the box-shaped body. Therefore, the box-shaped body of this configuration has excellent heat dissipation performance.

[0045] [5] In the box-shaped body (1) described in [4] above, The wall portion of the heat dissipation body (30) is a base portion (35) on which a terminal (36) for electrically connecting the inside and outside of the box-shaped body (1) can be fixed; Box (1).

[0046] According to the box-shaped body of the configuration [5] above, the wall of the heat sink is used as a base to which terminals that electrically connect the inside and outside of the box-shaped body can be fixed, so that the base is less likely to interfere with heat dissipation.

[0047] [6] The box-shaped body (1) described in [4] above, The device includes a case (30) and a cover (20) that define the internal space, The wall portion of the heat dissipation body (30) is mounting portions (34a, 34b) to which a fastener for fastening the cover (20) to the case (30) can be attached; Box (1).

[0048] According to the box-shaped body of the configuration [6] above, the wall of the heat sink is used as a mounting part to which a fastener that fastens the case and cover that constitute the box-shaped body can be attached. For example, when a bolt is used as the fastener, even if the mounting part for providing the bolt fastening hole is provided near the heat dissipation fin, the mounting part is unlikely to interfere with heat dissipation. [Explanation of symbols]

[0049] 1 Box-shaped body 20 Cover 30 Case (heat sink) 32 Bottom wall (base) 34a Bolt mounting part (wall part, mounting part) 34b Bolt mounting part (wall part, mounting part) 35 Base (wall) 36 Power input terminal (terminal) 37a Heat dissipation fin 37b Heat dissipation fin 37c Heat dissipation fin

Claims

1. A heat sink that dissipates heat generated by a heat source, a base portion to which the heat is transferred; a plurality of heat dissipation fins provided on the base portion and extending in a predetermined extension direction; and a wall portion adjacent to the plurality of heat dissipation fins in the extension direction; The plurality of heat dissipation fins include: The heat dissipation fins include two or more heat dissipation fins configured such that a distance between each heat dissipation fin and the wall portion in the extension direction increases as the distance approaches one end of the wall portion in a cross direction intersecting the extension direction. Heat sink.

2. The heat sink according to claim 1, The plurality of heat dissipation fins include: two or more heat dissipation fins configured such that the spacing between them increases as they approach one end from the center of the wall portion in the cross direction, and two or more other heat dissipation fins configured such that the spacing between them increases as they approach the other end from the center of the wall portion in the cross direction, Heat sink.

3. The heat sink according to claim 1, Further, another wall portion is provided at a position adjacent to the wall portion in the crossing direction. Heat sink.

4. A box-shaped body capable of accommodating a heat source in an internal space, The heat sink according to any one of claims 1 to 3 is provided as at least a part of the outer wall of the box-shaped body. Box-shaped body.

5. The box-shaped body according to claim 4, The wall portion of the heat sink is a base portion capable of fixing a terminal for electrically connecting the inside and outside of the box-shaped body; Box-shaped body.

6. The box-shaped body according to claim 4, a case and a cover that define the internal space; The wall portion of the heat sink is a mounting portion to which a fastener for fixing the cover to the case can be attached; Box-shaped body.

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