JP2018160552A - Heat dissipation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat radiation structure which prevents dust from adhering thereto while cooling heating components.SOLUTION: A heat radiation structure 1 includes: a cylindrical member 10 formed into a cylindrical shape and having an outer surface 11 on which at least one heating component HC is disposed; and a case member 20 which is disposed so as to enclose the cylindrical member 10. Both ends of an internal space 12 of the cylindrical member 10 open to the outside of the case member 20. A storage space 40 between the case member 20 and the outer surface 11 of the cylindrical member 10 is sealed from the internal space 12 of the cylindrical member 10 and the outside of the case member 20.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a heat dissipation structure.

  2. Description of the Related Art Conventionally, there is an electric apparatus that includes a heat-generating component that generates heat when energized, such as an electronic component, in which a cooling method using forced air cooling is employed to cool heat generated from the heat-generating component (see, for example, Patent Document 1). ). In this cooling method, the heat-generating component is cooled by flowing outside air directly into the electric device using a fan or the like.

JP 2010-153526 A

  However, in the above-described cooling method, dust or dust is likely to be mixed into the electric device when outside air is taken into the electric device. When this dust accumulates on a substrate or an electronic component inside the electric device, there is a possibility that the electric device may fail.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat dissipation structure that can prevent dust from adhering while cooling a heat generating component such as an electronic component.

  A heat dissipation structure according to an aspect of the present invention includes a cylindrical member that is formed in a cylindrical shape and has an outer surface on which at least one heat generating component is disposed, and a case member that is disposed so as to surround the cylindrical member. Both ends of the internal space of the cylindrical member are open to the outside of the case member. A space between the case member and the outer surface of the cylindrical member is sealed with respect to the internal space of the cylindrical member and the outside of the case member.

  According to the above heat dissipation structure, the heat of the heat generating component disposed on the outer surface of the cylindrical member is transmitted to the cylindrical member by heat conduction or the like. Can be cooled. At this time, the space between the outer surface of the cylindrical member on which the heat generating component is arranged and the case member is sealed with respect to the inner space of the cylindrical member and the outside of the case member. Even if it goes, it can prevent that dust adheres to components, such as a heat-emitting component arrange | positioned in the space between a case member and the outer surface of a cylinder member.

1 is an overall perspective view of a heat dissipation structure according to an embodiment of the present invention. It is a front view of the heat dissipation structure. It is sectional drawing in the III-III line of FIG. It is sectional drawing in the IV-IV line of FIG. It is a figure which shows the modification of the said thermal radiation structure.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 4, the heat dissipation structure 1 according to this embodiment includes a cylindrical member 10 and a case member 20.

  The cylindrical member 10 is formed in a cylindrical shape, and has an outer surface 11 on which the heat generating component HC is disposed, and an inner space 12. The internal space 12 is a space surrounded by the inner surface of the cylindrical member 10. In the present embodiment, the cylindrical member 10 extends along the axis O1.

  In the following description, a direction along the axis O1 is appropriately referred to as an axial direction D1. A direction orthogonal to the axial direction D1 is appropriately referred to as a vertical direction (first orthogonal direction) D2, and a direction orthogonal to both the axial direction D1 and the vertical direction D2 is appropriately referred to as a horizontal direction (second orthogonal direction) D3. . In the present embodiment, the axial direction D1 is the left-right direction of the paper surface in FIG. 3, and is the direction orthogonal to the paper surface in FIG. The vertical direction D2 is the vertical direction of the paper surface in FIGS. The horizontal direction D3 is a direction orthogonal to the paper surface in FIG. 3, and is the left-right direction of the paper surface in FIG. In FIG. 3, the direction from the left end to the right end of the drawing is appropriately referred to as the front or front side of the axial direction D1, and the opposite direction is appropriately referred to as the rear or rear side of the axial direction D1. In FIG. 4, the direction from the lower end to the upper end of the drawing is appropriately referred to as the upper or upper side of the vertical direction D2, and the opposite direction is appropriately referred to as the lower or lower side of the vertical direction D2. In FIG. 4, the direction from the left end to the right end of the drawing is appropriately referred to as the right or right side of the horizontal direction D3, and the opposite direction is appropriately referred to as the left or left side of the horizontal direction D3.

  In the present embodiment, the cylindrical member 10 has a square cross-sectional shape extending in the vertical direction D2 and the horizontal direction D3 when viewed from the axial direction D1. The shape of the cross section perpendicular to the axial direction D1 of the cylindrical member 10 is constant along the axial direction D1 from the front end 10f to the rear end 10r of the cylindrical member 10. The tubular member 10 includes an upper portion 10t and a lower portion 10b having an outer surface 11 facing the vertical direction D2, and a right portion 10m and a left portion 10h having the outer surface 11 facing the lateral direction D3. The lower part 10b is located below the vertical direction D2 of the upper part 10t. The left portion 10h is located to the left of the right portion 10m in the lateral direction D3. Both ends of the upper portion 10t in the horizontal direction D3 are respectively connected to the upper end of the left portion 10h in the vertical direction D2 and the upper end of the right portion 10m in the vertical direction D2. Both ends of the lower portion 10b in the horizontal direction D3 are connected to the lower end in the vertical direction D2 of the left portion 10h and the lower end in the vertical direction D2 of the right portion 10m, respectively.

  In the internal space 12 of the cylindrical member 10, at least one radiating fin 30 connected to the cylindrical member 10 is provided. In the present embodiment, a plurality of heat radiation fins 30 are provided. The radiation fin 30 is formed in a plate shape extending along the axial direction D1 and the longitudinal direction D2. Both ends of the radiating fin 30 in the vertical direction D2, that is, the upper end 30t and the lower end 30b are connected to the cylindrical member 10. Specifically, the upper end portion 30 t of the radiating fin 30 is connected to the upper portion 10 t of the cylindrical member 10. The lower end portion 30 b of the radiating fin 30 is connected to the lower portion 10 b of the cylindrical member 10.

  The radiating fin 30 extends along the axial direction D1 from the front end 10f to the rear end 10r of the tubular member 10. In addition, the radiating fins 30 are arranged in parallel to each other at equal intervals in the lateral direction D3 in the internal space 12 of the cylindrical member 10.

  The cylindrical member 10 and the radiation fin 30 can be integrally formed by, for example, extrusion molding. The cylindrical member 10 and the radiation fin 30 are made of a metal having high thermal conductivity such as aluminum.

  The case member 20 is disposed so as to surround the cylindrical member 10. In the present embodiment, the case member 20 is formed in a box shape having a rectangular parallelepiped shape having sides extending in the respective directions of the axial direction D1, the vertical direction D2, and the horizontal direction D3. The cylindrical member 10 is disposed inside the box-shaped case member 20.

  Both ends of the internal space 12 of the cylindrical member 10, that is, the opening end on the front end 10 f side and the opening end on the rear end 10 r side of the cylindrical member 10 are both open to the outside of the case member 20. Specifically, an opening 21f and an opening 21r are respectively formed in the front surface portion 20f and the rear surface portion 20r having surfaces facing the axial direction D1 in the case member 20. The opening end on the front end 10 f side of the internal space 12 of the cylindrical member 10 opens to the outside of the case member 20 through the opening 21 f of the front surface portion 20 f of the case member 20. Further, the opening end on the rear end 10r side of the internal space 12 of the cylindrical member 10 opens to the outside of the case member 20 through the opening 21r of the rear surface portion 20r of the case member 20.

  More specifically, the opening 21f of the front surface portion 20f penetrates the front surface portion 20f in the axial direction D1. The opening 21r of the rear surface portion 20r disposed behind the front surface portion 20f in the axial direction D1 passes through the rear surface portion 20r in the axial direction D1. The shape and size of the opening 21f and the opening 21r viewed from the axial direction D1 respectively correspond to the shape and size of the peripheral edge of the internal space 12 of the cylindrical member 10 viewed from the axial direction D1. The opening 21f and the opening 21r are arranged so as to coincide with each other when viewed from the axial direction D1. The cylindrical member 10 is arranged inside the case member 20 so that the internal space 12 coincides with the opening 21f and the opening 21r when viewed from the axial direction D1.

  The accommodation space 40 between the case member 20 and the outer surface 11 of the cylindrical member 10 is sealed with respect to the internal space 12 of the cylindrical member 10 and the outside of the case member 20. In the present embodiment, in the cylindrical member 10 disposed inside the case member 20 as described above, the front end 10f and the front surface portion 20f of the case member 20 are connected to each other without any gaps, for example, by screwing or the like. Similarly, the rear end 10r of the cylindrical member 10 and the rear surface portion 20r of the case member 20 are connected to each other without a gap by, for example, screwing or the like. Thereby, the accommodation space 40 between the case member 20 and the outer surface 11 of the cylindrical member 10 can be sealed with respect to the internal space 12 of the cylindrical member 10 and the outside of the case member 20. The heat generating component HC disposed on the outer surface 11 of the cylindrical member 10 is located in the accommodation space 40.

  Further, known sealing members such as packing and gaskets are provided between the front end 10f of the cylindrical member 10 and the front surface portion 20f of the case member 20 and between the rear end 10r of the cylindrical member 10 and the rear surface portion 20r of the case member 20, respectively. By providing, the accommodation space 40 can be sealed more reliably. Moreover, the inside of the accommodation space 40 can be waterproofed by using a sealing member having predetermined performance such as water resistance and weather resistance.

  The case member 20 is made of a metal such as iron, for example. Therefore, the thermal conductivity of the cylindrical member 10 is larger than the thermal conductivity of the case member 20.

  In the present embodiment, the case member 20 is provided with a fan FA for blowing air into the internal space 12 of the tubular member 10. The fan FA is disposed on the front surface portion 20f of the case member 20 so as to cover the internal space 12 when viewed from the axial direction D1. A fan having a known configuration can be used as the fan FA.

  Next, the heat generating component HC disposed on the outer surface 11 of the cylindrical member 10 will be described. The heat generating component HC is a component that generates heat when energized, such as an electronic component. At least one heat generating component HC is disposed on the outer surface 11 of the cylindrical member 10. In the present embodiment, a plurality of heat generating components HC are arranged on the outer surface 11 of the cylindrical member 10. The heat generating component HC is mounted on the substrate CB and constitutes a circuit together with the substrate CB. For this reason, the heat generating component HC is disposed between the substrate CB and the outer surface 11 of the cylindrical member 10. The heat generating component HC is disposed on the outer surface 11 of the cylindrical member 10 in such a manner that it can conduct heat with the cylindrical member 10. For example, the heat generating component HC may be disposed on the outer surface 11 so as to be in direct contact with the outer surface 11 of the tubular member 10, or a known heat conductive sheet or thermal grease is sandwiched between the outer surface 11 and the outer surface 11. May be arranged. Further, the heat generating component HC may be disposed on the outer surface 11 of the cylindrical member 10 so as to be able to conduct heat with the cylindrical member 10 via a known heat sink.

  In the present embodiment, among the plurality of heat generating components HC, the heat generating component HC1 is disposed on the outer surface 11 of the upper portion 10t of the tubular member 10, and the heat generating component is disposed on the outer surface 11 of the left portion 10h of the cylindrical member 10. HC2 is disposed, and a heat generating component HC3 is disposed on the outer surface 11 of the lower portion 10b of the cylindrical member 10. That is, the heat generating component HC1 and the heat generating component HC3 are disposed in regions corresponding to the upper end portion 30t and the lower end portion 30b of the radiating fin 30 on the outer surface 11 of the cylindrical member 10, and the heat generating component HC2 is disposed on the outer surface of the cylindrical member 10. 11 in a region facing the horizontal direction D3. In this case, the heat generation amount of the heat generating component (second heat generating component) HC2 disposed in the region facing the horizontal direction D3 is disposed in the region of the outer surface 11 corresponding to the upper end portion 30t and the lower end portion 30b of the radiation fin 30, respectively. It is preferable that the heat generation amount of the heat generating component (first heat generating component) HC1 and the heat generating component (first heat generating component) HC3 is smaller.

  Further, for example, when the heat dissipation structure 1 is arranged so that the vertical direction D2 of the cylindrical member 10 and the vertical direction coincide with each other, the heat generating component (fourth heat generation) arranged below the internal space 12 of the cylindrical member 10 is used. The amount of heat generated by the component HC3 is preferably larger than the amount of heat generated by the heat generating component (third heat generating component) HC1 disposed above the internal space 12 of the cylindrical member 10.

  According to this embodiment, the heat dissipation structure 1 is formed in a cylindrical shape, and includes a cylindrical member 10 having an outer surface 11 on which the heat generating component HC is disposed, and a case member 20 disposed so as to surround the cylindrical member 10. Prepare. Both ends of the internal space 12 of the cylindrical member 10 are open to the outside of the case member 20. The accommodation space 40 between the case member 20 and the outer surface 11 of the cylindrical member 10 is sealed with respect to the internal space 12 of the cylindrical member 10 and the outside of the case member 20.

  According to such a configuration, since the heat of the heat generating component HC disposed on the outer surface 11 of the cylindrical member 10 is transmitted to the cylindrical member 10 by heat conduction or the like, the internal space 12 of the cylindrical member 10 is cooled by blowing air or the like. Thus, the heat generating component HC can be cooled. At this time, the housing space 40 between the outer surface 11 of the cylindrical member 10 on which the heat generating component HC is arranged and the case member 20 is sealed with respect to the outside, so air is blown to the internal space 12 of the cylindrical member 10. However, it is possible to prevent dust from adhering to components such as the heat generating component HC disposed in the accommodation space 40.

  In addition, since the heat of the heat generating component HC is mainly released to the outside not through the case member 20 but through the cylindrical member 10, an increase in the temperature of the case member 20 can be suppressed. As a result, the temperature of the case member 20 can be suppressed to a temperature that does not hinder the case member 20 from being touched, and the electric device provided with the heat dissipation structure 1 by holding the case member 20 even when the heat generating component HC generates heat. Can be carried around. Further, even when a plurality of heat dissipation structures 1 are arranged adjacent to each other in the vertical direction D2 or the horizontal direction D3, it is possible to prevent heat from being received from the case member 20 of the adjacent heat dissipation structure 1.

  Further, the thermal conductivity of the cylindrical member 10 is larger than the thermal conductivity of the case member 20. As a result, the heat generated from the heat generating component HC is conducted to the cylindrical member 10 more than the case member 20 and is released from the cylindrical member 10 to the internal space 12. Therefore, the temperature rise of the case member 20 can be more reliably suppressed.

  In addition, in the internal space 12 of the cylindrical member 10, heat radiation fins 30 connected to the cylindrical member 10 are provided. Thereby, the heat of the heat generating component HC can be efficiently transmitted from the cylindrical member 10 to the heat radiation fin 30. That is, the heat of the heat generating component HC can be efficiently transmitted to the internal space 12 of the cylindrical member 10. Therefore, the heat generating component HC can be cooled more effectively.

  Moreover, the radiation fin 30 is formed in the plate shape extended along the axial direction D1 and the vertical direction D2 of the cylinder member 10. FIG. Both ends of the radiating fin 30 in the longitudinal direction D <b> 2 are connected to the cylindrical member 10. Of the plurality of heat generating components HC, the heat generating component HC1 and the heat generating component HC3 are disposed on the outer surface 11 of the cylindrical member 10 in regions corresponding to both ends of the heat dissipating fin 30 in the vertical direction D2. Of the heat generating component HC, the heat generating component HC2 having a smaller amount of heat generation than the heat generating component HC1 and the heat generating component HC3 is disposed in the region facing the lateral direction D3 on the outer surface 11 of the cylindrical member 10.

  According to such a configuration, since the large heat generated in the heat generating component HC1 and the heat generating component HC3 is efficiently transmitted to the internal space 12 of the cylindrical member 10 via the radiation fins 30, the heat generated in the heat generating component HC2 Compared to the inner space 12 of the cylindrical member 10, it is easily released. Therefore, the heat generating component HC1 and the heat generating component HC3 having a large heat generation amount can be effectively cooled in preference to the heat generating component HC2 having a small heat generation amount.

  Further, the heat generating component HC1 is disposed above the internal space 12 of the cylindrical member 10. The heat generating component HC3 that generates a larger amount of heat than the heat generating component HC1 is disposed below the internal space 12 of the cylindrical member 10. Therefore, the heat generated in the heat generating component HC3 having a large heat generation amount disposed below the internal space 12 is directed upward in the housing space 40 to the internal space 12 in which the heat generating component HC1 having a small heat generation amount is disposed. It is transmitted. By such heat transfer, the temperature distribution in the accommodation space 40 can be made uniform. For example, when the heat generating component HC having a large heat generation amount is disposed above the internal space 12 of the cylindrical member 10 and the heat generating component HC having a small heat generation amount is disposed below the internal space 12 of the cylindrical member 10. Since the heat generated in the heat generating component HC is concentrated in a region above the internal space 12 in the accommodation space 40, the temperature in this region may be extremely higher than other regions. On the other hand, in the arrangement of the heat generating component HC described above, the temperature distribution in the accommodation space 40 can be made closer to the uniform, so that it is possible to prevent an extremely high temperature region from occurring in the accommodation space 40.

  In the above embodiment, the cylindrical member 10 has a square cross-sectional shape, and the internal space 12 of the cylindrical member 10 has a square cross-sectional shape along with this, but the present invention is not limited to this. For example, you may comprise a cylinder member like the modification shown in FIG. The cylindrical member 110 of the heat dissipation structure 2 of the modification shown in FIG. 5 has a rectangular cross-sectional shape in which the dimension in the vertical direction D2 is smaller than the dimension in the horizontal direction D3 when viewed from the axial direction D1. Accordingly, also in the internal space 112 of the cylindrical member 110, the dimension in the vertical direction D2 of the internal space 112 is smaller than the dimension in the horizontal direction D3.

  If the dimension of the radiating fin 30 in the vertical direction D2 is increased to some extent, heat cannot be transmitted to the central portion of the radiating fin 30 in the vertical direction D2, so that further improvement of the radiating effect cannot be expected. Therefore, by configuring as described above, it is possible to increase the dimension of the cylindrical member 110 in the lateral direction D3 while suppressing the dimension of the radiating fin 30 in the longitudinal direction D2 within an effective range for heat dissipation. Accordingly, it is possible to increase the outer surface 11 of the cylindrical member 110 on which the heat generating component HC can be disposed while suitably maintaining the cooling effect by the radiating fins 30.

  In addition, when the internal space 112 has a rectangular cross section like the above-described cylindrical member 110, a plurality of fans may be provided instead of a single fan. In this case, a wall portion that divides the internal space 112 into a plurality of lateral directions D3 may be provided so as to form a plurality of internal spaces respectively corresponding to the plurality of fans. By comprising in this way, it can prevent that the ventilation from each fan interferes with each other in internal space.

  In addition to the shapes described above, the shape of the cross section perpendicular to the axial direction D1 of the cylindrical member and the internal space may be other polygons, circles, or the like.

  Moreover, in the said embodiment, although the shape of the cross section perpendicular | vertical to the axial direction D1 of the cylindrical member 10 and the internal space 12 was constant along the axial direction D1 from the front end 10f of the cylindrical member 10 to the rear end 10r, Not limited to. The cross-sectional shapes perpendicular to the axial direction D1 of the cylindrical member 10 and the internal space 12 may change along the axial direction D1.

  Moreover, in the said embodiment, although the cylindrical member 10 and the radiation fin 30 were formed integrally, it is not restricted to this. The cylindrical member 10 and the radiation fin 30 may be formed separately and then connected to each other, for example, by welding. Moreover, although the radiation fin 30 was provided along the axial direction D1 from the front end 10f of the cylinder member 10 to the rear end 10r, it is not restricted to this. The heat radiation fin 30 may be provided in a part from the front end 10 f to the rear end 10 r of the cylindrical member 10. Moreover, although the radiation fin 30 was arrange | positioned at equal intervals in the horizontal direction D3, you may be arrange | positioned at irregular intervals suitably.

  In the said embodiment, although the cylinder member 10 and the case member 20 were comprised with a mutually different material, it may comprise not only this but the same material. That is, the thermal conductivity of the cylindrical member 10 and the case member 20 may be equal to each other. Further, when the cylindrical member 10 and the case member 20 are connected to each other by screwing as described above, screw holes for screwing fixing screws are formed at the front end 10f and the rear end 10r of the cylindrical member 10. Also good.

  The fan FA is provided on the front surface portion 20f of the case member 20. However, the present invention is not limited thereto, and the fan FA may be provided on the rear surface portion 20r of the case member 20. Further, the fan FA may be provided separately from the heat dissipation structure 1. When the fan FA is provided, the fan FA can be used to blow air to the internal space 12 of the tubular member 10, so that the cooling of the tubular member 10 can be promoted. Further, the fan FA may not be used for cooling the cylindrical member 10. In this case, for example, the heat dissipating structure 1 is arranged so that one of the axial directions D1 coincides with the vertical direction, that is, the cylindrical member 10 is arranged in the vertical direction, and the cylindrical member 10 is cooled by natural air cooling. May be.

  Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this embodiment. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1, 2, Radiation structure 10, 110 Cylindrical member 11 Outer surface 12, 112 Internal space 20 Case member 30 Radiation fin 40 Storage space (space)
CB board FA fan HC Heat generation part D1 Axial direction D2 Longitudinal direction (first orthogonal direction)
D3 Lateral direction (second orthogonal direction)

Claims (6)

A cylindrical member formed in a cylindrical shape and having an outer surface on which at least one heat generating component is disposed;
A case member arranged so as to surround the cylindrical member;
With
Both ends of the internal space of the cylindrical member are open to the outside of the case member,
The space between the case member and the outer surface of the cylindrical member is sealed with respect to the internal space of the cylindrical member and the outside of the case member. The heat dissipation structure according to claim 1,
The heat conductivity of the said cylindrical member is larger than the heat conductivity of the said case member. The heat dissipation structure according to claim 1 or 2,
In the internal space of the cylindrical member, at least one radiating fin connected to the cylindrical member is provided. The heat dissipation structure according to claim 3,
The radiating fin is formed in a plate shape extending along an axial direction of the cylindrical member and a first orthogonal direction orthogonal to the axial direction,
Both end portions in the first orthogonal direction of the heat dissipating fins are connected to the cylindrical member,
A plurality of the heat generating components are arranged on the outer surface of the cylindrical member,
Of the plurality of heat generating components, the first heat generating component is disposed in a region corresponding to at least one of both end portions of the heat radiating fin in the first orthogonal direction on the outer surface of the cylindrical member,
The second heat generating component having a heat generation amount smaller than that of the first heat generating component among the plurality of heat generating components has a second orthogonal direction orthogonal to both the axial direction and the first orthogonal direction on the outer surface of the cylindrical member. Heat dissipating structure placed in the area facing. The heat dissipation structure according to claim 3,
The radiating fin is formed in a plate shape in which the cylindrical member extends along an axial direction and a first orthogonal direction orthogonal to the axial direction,
Both end portions in the first orthogonal direction of the heat dissipating fins are connected to the cylindrical member,
The dimension in the first orthogonal direction in the internal space of the cylindrical member is smaller than the dimension in the second orthogonal direction orthogonal to both the axial direction and the first orthogonal direction in the internal space of the cylindrical member. . The heat dissipation structure according to any one of claims 1 to 3,
A plurality of the heat generating components are arranged on the outer surface of the cylindrical member,
The third heat generating component among the plurality of heat generating components is disposed above the internal space of the cylindrical member,
A fourth heat generating component having a larger heat generation amount than the third heat generating component among the plurality of heat generating components is disposed below the internal space of the cylindrical member.

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