JP2018031550A - Heat radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat radiator which can efficiently transfer heat from a heat source to a housing.SOLUTION: A heat radiator includes: a housing 2 including an opening 4a on at least one surface and covering a heat source 11; and a heat pipe 8 disposed in the housing 2. The opening 4a can be closed by a lid 5 formed by aluminum alloy etc. A refrigerant is enclosed in the heat pipe 8, and the heat pipe 8 has a refrigerant reflux mechanism. A heat receiving part 12 formed by a longitudinal part of the heat pipe 8 and an outer peripheral surface 3a of the heat pipe 8 respectively contact with the heat source 11 and a rear surface 6a of the lid 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat dissipation device that cools electronic / electrical components arranged inside an apparatus.

  Components such as semiconductor elements mounted in the electric / electronic field are components that generate heat and need to prevent deterioration due to temperature. In order to lower the temperature of the element which is such a heat source, a heat radiating device such as a heat sink is generally mounted on the heat generating element and radiates heat to the surrounding air.

  As shown in FIG. 8, such a heat dissipation device 100 includes a housing 200 that is a hexahedron formed mainly of a material having high thermal conductivity such as an aluminum alloy, and the element 110 is disposed inside the predetermined device. Is placed on the surface. The element 110 in the housing 200 is in contact with a plate-like heat radiating member 300 made of a material having high thermal conductivity such as an aluminum alloy, and heat is transferred from the heat radiating member 300 to the air in the housing 200. The heated air is transferred from each inner wall surface of the housing 200 and is transferred to the air outside the housing 200.

Japanese Patent No. 4550664 (5th page, Fig. 1)

  However, in such a heat dissipation device, heat is transferred to the housing through the air, so that it is difficult to transfer heat from that distance, especially on the surface facing the heating element arranged on a predetermined surface, and cooling efficiency There was a problem of low.

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide a heat dissipation device capable of efficiently transferring heat from a heat source to a housing.

In order to solve the above-described problem, the heat dissipation device of the present invention includes:
A housing that includes an opening on at least one surface and covers a heat source, and a heat pipe disposed in the housing, the opening can be closed by a lid formed of aluminum alloy or the like,
The heat pipe is filled with a refrigerant and has a recirculation mechanism for the refrigerant. A heat receiving portion constituted by a part in the longitudinal direction is the heat source, and an outer peripheral surface of the heat pipe is the lid body. It is in contact with the back surface.
According to this feature, the state of the refrigerant heated at the heat receiving portion of the heat pipe changes from a liquid to a gas, and the gas is moved in the longitudinal direction of the heat pipe by the evaporation pressure generated at the time of the state change. The mechanism returns to the heat receiving part again. Utilizing this function, the heat from the heat source can be efficiently transferred to the lid contacting the outer peripheral surface of the heat pipe to be dissipated to the outside of the housing, and the cooling efficiency is high.

The heat pipe is a meandering tubule shape shaped into a substantially coil shape by one, the heat pipe is bundled at the heat receiving portion, and the outer peripheral surface is in contact with the back surface of the lid at a plurality of locations. It is characterized by being.
According to this feature, a gas refrigerant and a liquid refrigerant flow in the same direction in a heat pipe of a meandering capillary type, so that a large amount of heat is generated over a long distance, that is, in the longitudinal direction of one heat pipe. It can be carried and heat can be efficiently distributed to the entire lid.

In the heat pipe, a partition wall that partitions the space is formed in the inside of a hollow tube member formed of aluminum or an aluminum alloy constituting the heat pipe, and is arranged at a plurality of positions on the back surface of the lid body. It is characterized by being pressed and fixed to the lid body in the longitudinal direction by a fixing member.
According to this feature, in addition to the tube member constituting the heat pipe being formed of aluminum or an aluminum alloy that is easily deformed, the strength of the radial direction is increased by the partition wall that partitions the tube member in the longitudinal direction. Therefore, the pipe member can be brought into contact with the back surface of the lid body in the longitudinal direction while preventing the plastic deformation of the pipe member in the radial direction, and from the heat pipe to the heat exchange member with high heat transfer efficiency. Heat can be transferred.

The partition wall has a cross-sectional shape that partitions the inside of the pipe member into a plurality of spaces.
According to this feature, plastic deformation in the radial direction can be prevented over the circumferential direction of the pipe member.

The partition is characterized by having a substantially cross-shaped cross section that partitions the inside of the pipe member into four.
According to this feature, the strength of the pipe member in the radial direction is high, and deformation of the pipe member can be reliably prevented when the adjacent heat radiating members are stacked.

It is a perspective view which shows the thermal radiation apparatus in an Example. It is a perspective view which shows the housing body in a state where the lid is removed. It is a side view of the one-way view which shows a heat radiator. It is the perspective view which shows a fixing member, and the partial cross section perspective view which shows a heat pipe. It is a side view of the other direction view which shows a thermal radiation apparatus. It is an expanded sectional view which expands a part in FIG. It is a partially expanded side view which shows the state which pinched | interposed the heat pipe with the fixing member and the cover body. It is a figure which shows the conventional heat radiator.

  EMBODIMENT OF THE INVENTION The form for implementing the thermal radiation apparatus which concerns on this invention is demonstrated below based on an Example.

  The heat radiating device according to the embodiment will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the heat radiating device 1 is mainly composed of a housing 2 and a heat transfer device 3. The housing 2 includes a housing body 4 having an opening 4a on one surface made of a metal material having high thermal conductivity such as aluminum, and a lid 5 that closes the opening 4a.

  The lid 5 is composed of a plate-like base surface portion 6 and a plurality of heat radiation fins 7, 7,... Rising upward from the base surface portion 6, and the opening 4a of the housing body 4 is defined by screws 10, 10,. It is being fixed to the side wall upper edge 4b, 4b, ... which comprises.

  As shown in FIGS. 2 and 3, the housing body 4 has a substantially rectangular parallelepiped shape, and the heat transfer device 3 is included therein. The heat transfer device 3 includes a heat pipe 8, a heat receiving plate 9 that integrally binds the body of the heat pipe 8, and an element 11 that is a heat source with which the heat receiving plate 9 is in contact.

  The heat dissipation device 1 moves the heat transmitted from the element 11 that is a heat source in contact with the heat pipe 8 of the heat transfer device 3 in the longitudinal direction of the heat pipe 8 by the movement of the working fluid filled in the heat pipe 8, and Heat is transferred to the lid 5 that is in contact with the outer peripheral surface 3a (see FIG. 3) of the heat pipe 8, and heat is transferred from the lid 5 formed of a material having a large surface area and suitable for heat dissipation to the outside air. The purpose is to effectively dissipate heat. The heat radiating device 1 may have a mode in which heat is radiated by forced convection using a blowing unit such as a fan, or may be a mode in which heat is radiated by natural convection without using a blowing unit.

  The heat pipe 8 is one heat pipe shaped in a substantially coil shape from the start end to the end, and a plurality of the heat pipes 8 are integrally bound so that the body portion of the heat pipe 8 is embedded in the heat receiving plate 9. The heat receiving portion 12 is configured by a part of the bundled heat pipe 8 and the heat receiving plate 9. In addition, in the state which the part (the opening part 4a side of the housing body 4 in the figure) facing the heat receiving part 12 of the heat pipe 8 is expanded in a substantially radial manner, the fixing member 13 which will be described in detail later is used to attach the lid 5. It is fixed and constitutes a heat radiating portion together with the lid 5.

  Further, as shown in FIG. 3, the portion of the heat pipe 8 that faces the heat receiving portion 12, that is, the portion that faces the back surface 6 b of the lid 5 is arranged over the length of the lid 5. A contact area with the body 5 is secured.

  Further, the heat pipe 8 is a so-called meandering tube type, and in the heat pipe 8, since the gaseous refrigerant and the liquid refrigerant flow in the same direction, the heat pipe 8 extends over a long distance, that is, in the longitudinal direction of one heat pipe 8. It can carry a lot of heat.

  As shown in FIG. 4, the fixing member 13 is a so-called saddle band, and includes a semicircular bending portion 13 a and fixing pieces 13 b and 13 b extending in a flat plate shape from the left and right of the bending portion 13 a. As shown in FIG. 3, the heat pipe 8 is arranged at two predetermined distances in the longitudinal direction. The fixing pieces 13b and 13b are formed with holes 13c and 13c which are screwed with fixing screws 15 and 15 to be described later, respectively.

  As shown in FIGS. 5 and 6, the holes 13 c and 13 c provided in the fixing pieces 13 b and 13 b are a plurality of holes that penetrate the base surface portion 6 of the lid 5 vertically and are separated by a predetermined distance. It arrange | positions in the position corresponding to part 6a, 6a, .... The fixing screws 15 and 15 are inserted through the holes 6a and 6a from above, and the tip ends are screwed into the holes 13c and 13c. The fixing member 13 is relatively close to the base surface portion 6 by this screwing. ing. The holes 6a, 6a,... Are formed between the radiation fins 7, 7,.

  As shown in FIGS. 1 and 3, the portions of the heat pipe 8 that face the back surface 6 b of the lid 5 are arranged orthogonal to the radiation fins 7, 7,. In addition to being able to efficiently transfer heat transferred to the radiating fins 7, 7,..., The portions of the plurality of heat pipes 8 facing the back surface 6 b of the lid 5 are all radiating fins 7, Since it intersects with 7,..., Heat can be transferred to the radiation fins 7, 7,.

  The heat pipe 8 arranged on the curved portion 13 a is pressed and supported by the lower end surface of the base surface portion 6 of the lid body 5 due to the proximity of the fixing member 13 and the base surface portion 6 described above. . At this time, the outer peripheral surface 3a of the heat pipe 8 is pressed and supported by the back surface 6b of the base surface portion 6 of the lid 5 over the longitudinal direction of the curved portion of the fixing member 13 (see FIG. 7). The outer peripheral surface 3 a can easily follow the shape of the back surface 6 b of the base surface portion 6, and a contact area necessary for efficient heat transfer from the heat pipe 8 to the lid 5 can be ensured.

  As shown in FIG. 4, the heat pipe 8 includes partition walls 31, 31, 31, 31 that divide the inside of the pipe body 30 radially from the central axis of the pipe body 30 to the inner peripheral surface 30 a of the pipe body 30. It has been. These partition walls 31, 31, 31, 31 enhance the strength of the heat pipe 8 in the radial direction. Therefore, the heat pipe 8 is not easily crushed by the pressing force applied in the radial direction of the heat pipe 8 when the fixing member 13 and the base surface portion 6 are close to each other by screwing the fixing screw 15 and the hole 13 c of the fixing member 13. Thus, the flow of the working fluid filled in the heat pipe 8 is not hindered.

  Moreover, since the cross-sectional shape of the heat pipe 8 is maintained by the partition walls 31, 31, 31, 31, the heat pipe 8 is not easily crushed even when bent with a large curvature, and the heat pipe 8 is matched to the internal shape of the housing 2. A compact shape can be obtained. The partition walls 31, 31, 31, 31 are provided over most of the longitudinal direction of the pipe main body 30, but are not limited thereto, and for example, the fixing member 13 and the base surface portion 6 in the longitudinal direction of the pipe main body 30. You may abbreviate | omit except the position pinched | interposed.

  Moreover, since the heat pipe 8 is a meandering capillary type, it has a structure without a so-called wick inside, and the movement of the refrigerant is not hindered in any direction. Therefore, one heat pipe can be formed into a substantially coil shape in accordance with the shape of the housing 2.

  As shown in FIGS. 5 and 6, the fixing screw 15 is inserted from the hole 6 a from the outside of the lid 5, and the fixing member 13 inside the housing 2 can be fixed to the inside of the lid 5. It has become. Therefore, at the time of assembly, the fixing member 13 is temporarily fixed to the base surface portion 6 of the lid 5 with the fixing screw 15 with the heat pipe 8 interposed therebetween, and the fixing screw 15 is increased after the lid 5 is fixed to the housing body 4. By tightening, the heat pipe 8 can be pressed against the back surface 6 b of the base surface portion 6. According to this, in addition to being able to shape the heat pipe 8 compactly according to the shape of the housing 2, the outer peripheral surface 3 a of the heat pipe 8 is brought into contact with the entire back surface 6 b of the base surface portion 6. Thus, heat can be efficiently delivered to the entire lid body 5.

  On the other hand, when the heat dissipation device 1 is disassembled during maintenance of the element 11, the fixing member 13 and the lid body 5 are unfixed, and the lid body 5 is removed from the housing body 4 to access the element 11. Can do.

  In addition, the heat pipe 8 is made of an aluminum alloy and is easily deformed. In addition, the heat pipe 8 has a partition wall 31, 31, 31, 31 and is not easily buckled. After removal, the same heat pipe 8 can be reused by reshaping it into a predetermined shape, resulting in lower costs.

  In addition, since one heat pipe 8 is shaped into a substantially coil shape and disposed in the housing 2, the heat moving in the longitudinal direction of the heat pipe 8 is partially transferred to the air around the heat pipe 8. As a result, the heat transfer efficiency to the inner walls of the casing body 4 to which the heat pipes 8 are respectively close is high, and the cooling effect of the entire casing 2 is enhanced.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, the heat pipe 8 in the above embodiment has one heat pipe arranged in a substantially coil shape in the housing 2, but the number of heat pipes is not limited to this, for example, a plurality of short pipes One end of the heat pipe may be bound by the heat receiving plate 9 and the other end may be fixed to the lid 5.

  In the embodiment, the heat radiating device 1 is assembled by temporarily fixing the fixing member 13 to the base surface portion 6 of the lid 5 with the fixing screw 15 with the heat pipe 8 interposed therebetween, and the lid 5 is attached to the casing body 4. Although it demonstrated in the aspect which presses the heat pipe 8 to the back surface 6b of the base surface part 6 by tightening the fixing screw 15 after fixing, it is not restricted to this aspect, For example, in the state which tightened the fixing screw 15 beforehand The lid 5 may be fixed to the housing body 4.

  Further, the opening 4a formed in the housing body 4 is not limited to being formed on the surface facing the surface on which the element 11 is disposed, and for example, in the left-right direction on one of the left and right side walls in FIG. It may be formed.

  Further, the heat pipe is not limited to a structure having a partition wall that divides the inside of the pipe body 30 into four as in the above-described embodiment, and may be configured to partition the inside of the pipe body 30 into three, for example. When a plurality of short heat pipes are used, a structure with no partition may be omitted because a large curvature is not required.

  Moreover, the part facing the back surface 6b of the lid 5 in the heat pipe 8 is not limited to the configuration arranged orthogonal to the radiation fins 7, 7,..., For example, in parallel with the radiation fins 7, 7,. They may be arranged, or may be arranged so as to cross each other obliquely.

DESCRIPTION OF SYMBOLS 1 Heat radiating device 2 Housing | casing 3 Heat transfer device 3a Outer peripheral surface 4 Housing | casing main body 4a Opening part 5 Lid body 6 Base surface part 6b Base surface part back surface 6a, 6a, ... Hole part 7, 7, Radiation fin 8 Heat pipe 9 Heat receiving plate 10 , 10, screw 11 element 12 heat receiving portion 13 fixing member 13a bending portion 13b, 13b fixing piece 13c, 13c hole 15 fixing screw 30 pipe main body 30a inner peripheral surfaces 31, 31,.

Claims (5)

A housing that includes an opening on at least one surface and covers a heat source, and a heat pipe disposed in the housing, the opening can be closed by a lid formed of aluminum alloy or the like,
The heat pipe is filled with a refrigerant and has a recirculation mechanism for the refrigerant. A heat receiving portion constituted by a part in the longitudinal direction is the heat source, and an outer peripheral surface of the heat pipe is the lid body. A heat dissipating device that is in contact with the back surface.   The heat pipe is a meandering tubule shape shaped into a substantially coil shape by one, the heat pipe is bundled at the heat receiving portion, and the outer peripheral surface is in contact with the back surface of the lid at a plurality of locations. The heat radiating device according to claim 1, wherein   In the heat pipe, a partition wall that partitions the space is formed in the inside of a hollow tube member formed of aluminum or an aluminum alloy constituting the heat pipe, and is arranged at a plurality of positions on the back surface of the lid body. The heat radiating device according to claim 1, wherein the heat radiating device is pressed and fixed to the lid body in a longitudinal direction by a fixing member.   The heat dissipation device according to claim 3, wherein the partition wall has a cross-sectional shape that partitions the inside of the pipe member into a plurality of spaces.   The heat dissipation device according to claim 3, wherein the partition wall has a substantially cross-shaped cross section that partitions the inside of the pipe member into four.

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