JP2018031549A - Heat radiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat radiator capable of transferring heat from a heat pipe to a heat radiation member with high heat transfer efficiency.SOLUTION: A heat radiator includes a heat pipe 3 and heat radiation members 2. The heat radiation member 2 includes a frame part 6 extending linearly and a thin plate-like heat radiation plane part 5 formed continuously to the frame part 6, and the radiation members are laminated in a thickness direction of the heat radiation plane part 5. In a longitudinal direction of the frame part 6 of at least one of opposite heat radiation members 2, a groove 8A(8B) is formed on an opposite surface 7A(7B) to the frame part 6 of the opposite heat radiation member 2. The heat pipe 3 is arranged in a hollow part S formed by the frame part 6 of the opposite heat radiation member 2 and the groove 8A(8B).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 heat generating component, a heat radiating device such as a heat sink is generally mounted on the heat generating element and radiates heat to the surrounding air. The heat dissipation device is mainly made of a material with high thermal conductivity such as aluminum alloy. However, in recent years, the heat flux of semiconductor elements has increased, and the heat dissipation of the heat dissipation device itself has only increased. Since heat cannot be diffused efficiently throughout, there is one that has improved cooling efficiency by using a high heat conduction device such as a heat pipe in combination.

  The heat pipe will be briefly described by taking as an example a case where a part in the longitudinal direction of the heat pipe is a heat receiving part and a position away from the heat receiving part is a cooling part. In the heat pipe, a refrigerant is sealed inside, and the state of the refrigerant changes from liquid to gas by heating in the heat receiving part. The gas is moved to the cooling unit by the evaporation pressure generated at the time of this state change, and the refrigerant changes its state again from the gas to the liquid in the cooling unit, and returns to the heat receiving unit again by the reflux mechanism. Thus, heat can be moved from the heat receiving portion to the longitudinal direction of the heat pipe by the movement of the refrigerant. As such a heat radiating device, there is one that attaches a plurality of plate-like heat exchange members to the outer periphery of a heat pipe and radiates heat that moves the heat pipe in the longitudinal direction (for example, Patent Document 1).

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

  In the heat radiating device as in Patent Document 1, the plurality of heat radiating plates (heat radiating members) are arranged at intervals so that the opposing heat radiating planes are in contact with the outside air. The heat pipe penetrates the plane. According to this structure, the outer peripheral surface of the heat pipe comes into contact only with the inner peripheral surface of the hole into which the heat pipe formed in the heat radiating plate is inserted. There is a problem that it is difficult to say that the heat transfer efficiency to the heat sink is sufficiently high.

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide a heat radiating device capable of transferring heat from a heat pipe to a heat radiating member with high heat transfer efficiency.

In order to solve the above-described problem, the heat dissipation device of the present invention includes:
A heat dissipation device comprising a heat pipe and a heat dissipation member,
The heat dissipating member includes a frame portion extending substantially linearly and a thin heat dissipating flat surface portion formed continuously with the frame portion, and a plurality of the heat dissipating members are arranged in the thickness direction of the heat dissipating flat surface portion. ,
In the longitudinal direction of the frame portion of at least one of the opposed heat radiating members, a groove is formed on a surface facing the frame portion of the opposed radiating member, and is formed by the frame portion of the opposed radiating member and the groove. The heat pipe is disposed in the hollow portion formed.
According to this feature, the heat exchange member has a thin heat radiation flat surface, so that the heat radiation efficiency is high and the frame portion secures strength while the heat pipe has an outer peripheral surface facing the heat radiation. The heat transfer efficiency from the heat pipe to the frame part is high because it can contact the inner peripheral surface of the hollow part formed by the frame part of the member and the groove formed in the frame part in the longitudinal direction. The heat carried by the heat pipe can be sufficiently dissipated from the heat radiating flat portion continuous from the frame portion.

The heat pipe is of a single meandering capillary type, and the heat pipe is arranged across the groove of each frame portion.
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 transmitted to the entire heat dissipation device.

The grooves are formed in the frame portions of the opposing heat dissipating members, respectively.
According to this feature, since the inner peripheral surface of the groove portion of the frame portion of each radiating member facing each other is in contact with the outer peripheral surface of the heat pipe, it is possible to prevent uneven heat transfer to each radiating member facing each other.

Concavities and convexities are respectively formed on the opposing surfaces of the frame portions of the opposing heat dissipation members,
The frame portion of the heat radiating member is formed at both end portions of the heat radiating flat surface portion, and an inclined surface facing inward is formed on the opposing surface of each frame portion of the one heat radiating member, along the thickness direction. Each of the opposing heat radiating members is provided with an inclined surface in contact with the inclined surface and an inwardly inclined surface. A fitting concave portion into which the fitting convex portion bites is formed.
According to this feature, it is possible to secure the contact area between the opposing surfaces of the frame portions of the opposing heat radiating members, and to prevent uneven heat transfer to the opposing heat radiating members. By being inserted into the mating recess, it is guided and deformed by the inclined surface of the fitting recess and bites inward in the width direction, and movement of the frame portions of adjacent heat radiating members in the separating direction is restricted. At the same time, the fitting convex portion is subjected to a force to return to the original state by the elastic force, and due to this force, the frame portions of the adjacent heat radiating members and the heat pipes arranged between them are in close contact with each other. The heat transfer efficiency from the heat pipe to the frame part is maintained. Moreover, since the inclined surface of the frame part provided in the both-ends part of one heat radiating member becomes the structure which pinches | interposes the inclined surface of the frame part of the other heat radiating member, a heat radiating member is a short direction in a mutual frame part. It is possible to prevent the heat pipe disposed in the hollow portion from being deformed.

The heat pipe has a partition plate that partitions the interior into a plurality of spaces.
According to this feature, the strength of the heat pipe in the radial direction is high, and when the adjacent heat dissipating members are stacked, the heat pipe is not easily crushed and does not hinder the flow of the working fluid.

The partition plate has a substantially cross-shaped cross section.
According to this feature, the strength of the heat pipe in the radial direction is high, and when the adjacent heat dissipating members are stacked, the deformation of the heat pipe can be reliably prevented.

It is a perspective view which shows the thermal radiation apparatus in an Example. It is a front view which similarly shows a thermal radiation apparatus. It is a perspective view which shows the heat radiating member which comprises a heat radiating device. It is a partially expanded view which shows the flame | frame part of a thermal radiation member. It is a partial expansion perspective view which shows the flame | frame part of an adjacent thermal radiation member. It is a conceptual diagram which shows the connection aspect of the frame parts of adjacent heat radiating members, (a) is a figure which shows arrangement | positioning with a some flame | frame part and a heat pipe, (b) is a fitting convex part is a fitting recessed part. It is a figure which shows a mode that it guides to the inner wall of. It is a figure which shows a mode that the right-and-left fitting convex part each bite into the fitting recessed part. It is a partial cross section perspective view which shows the internal structure of a heat pipe. It is a perspective view which shows the thermal radiation apparatus in a modification.

  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. In the following description, the front side of the sheet of FIG. 2 is the front side (front side) of the heat radiating device, the left-right direction of the sheet of FIG.

  As shown in FIG. 1, the heat radiating device 1 includes heat radiating members 2, 2,... Connected in the thickness direction and a heat pipe 3. The heat dissipating members 2 connected to each other have the same shape except for the heat dissipating members 20, 20 located at both ends, and the heat dissipating members 2, 20,.

  The heat pipe 3 is configured to be bent in a substantially coil shape so that both ends thereof are located at both ends in the connecting direction of the heat radiating members 2, 20,. Further, the heat pipe 3 is a so-called meandering tube type, and in the heat pipe 3, the gas refrigerant and the liquid refrigerant flow in the same direction, so that the heat pipe 3 has a long distance, that is, in the longitudinal direction of one heat pipe 3. Can carry a large amount of heat.

  The heat radiating device 1 makes a heat receiving surface 4a (here, the left surface in FIG. 1 is pointed, but any surface may be used as a heat receiving surface) to a heat radiating device such as a semiconductor element (not shown). The heat transmitted from the heat receiving surface 4 a is transmitted through the heat radiating housing 4 and is transmitted to the heat pipe 3 embedded in the heat radiating housing 4 with the outer peripheral surface 3 a being in contact therewith. The heat transferred to the heat pipe 3 is moved in the longitudinal direction of the heat pipe 3 by the movement of the working fluid filled in the heat pipe 3, and is applied to the heat radiating casing 4 that contacts the outer peripheral surface 3a of the heat pipe 3 in the longitudinal direction. Heat is transferred. Therefore, heat reaches the entire heat radiating housing 4, and heat can be transferred from the heat radiating housing 4 to the outside air to effectively radiate heat. The heat radiating housing 4 may be in a mode in which heat is radiated by forced convection using a blowing unit such as a fan, or may be in a mode in which heat is radiated by natural convection without using a blowing unit.

  The heat radiating member 2 is formed to have the same cross-sectional shape by extruding a metal material having high thermal conductivity such as aluminum, for example, and as shown in FIGS. , 5 and a pair of substantially plane-symmetric frames that are continuous with both ends (upper and lower ends in FIG. 2) of the heat radiation plane portions 5 and 5 and extend linearly in parallel with both ends of the heat radiation plane portions 5 and 5. Parts 6 and 6. The heat radiation flat portions 5 and 5 are connected by connecting portions 9 and 9.

  As shown in FIGS. 4 and 5, in the frame portion 6, a fitting convex portion 61 is formed on one facing surface 7 </ b> A facing the adjacent heat radiating member, and a fitting concave portion 63 is formed on the other facing surface 7 </ b> B. Has been. In addition, substantially semicircular concave grooves 8A and 8B are formed in the opposing surfaces 7A and 7B of the frame portion 6 in the longitudinal direction of the opposing surfaces 7A and 7B, respectively, as shown in FIG. When the adjacent heat radiating members 2 and 2 are connected, a circular hollow portion S is formed by the opposing concave grooves 8A and 8B. The concave grooves 8 </ b> A and 8 </ b> B are formed to have a slightly larger diameter than the outer diameter of the heat pipe 3.

  The fitting convex portion 61 is formed so as to protrude upward in the stacking direction of the heat radiating member 2 so that the dimension in the width direction gradually decreases from the base end portion 611 toward the tip end portion 612, and adjacent heat radiating members. The fitting recess 63 can be press-fitted. Further, the fitting recess 63 has an opening 632 and an inner wall 633 formed to be inclined with respect to the protruding direction of the fitting projection 61.

  Further, the portion other than the fitting convex portion 61 and the concave groove 8A formed on the facing surface 7A is composed of the flat surface portion 65 and the concavo-convex shape portion 62, and the facing surface 7B is similarly fitted with the fitting concave portion. A portion other than 63 and the groove 8 </ b> B is formed by the flat portion 66 and the concavo-convex shape portion 64.

  Next, the process of assembling the heat radiating device 1 by connecting a plurality of heat radiating members 2 will be described with reference to FIGS. Here, the connection of three representative heat radiating members 2A, 2B, 2C will be described as an example, and the description of the connection of the other heat radiating members 2 will be omitted. In the present embodiment, an example in which three or more heat radiation members 2 are fitted substantially simultaneously will be described as an example, but the heat radiation members 2 may be sequentially fitted.

  First, as shown in FIG. 6A, the tip 612 of the fitting convex portion 61 and the opening 632 of the fitting concave portion 63 are aligned, and the heat pipe 3 is located between the concave grooves 8A and 8B. Three heat radiating members 2A, 2B, 2C are arranged in the thickness direction so as to be arranged.

  From such a state, the three heat radiating members 2A, 2B, and 2C are brought relatively close to each other using a press machine (not shown) or the like. At this time, as shown in FIG. 6B, the fitting convex portion 61 is inserted into the fitting concave portion 63 while being guided along the guide wall 631, and the distal end portion 612 is inserted into the inner wall 633 of the fitting concave portion 63. Abut. When the pressurization is further continued, the tip 612 is deformed along the inner wall 633.

  The tip portion 612 is further moved upward in the fitting recess 63 by pressurization, and as shown in FIG. 7, the flat surface portion 65 of the facing surface 7A and the flat surface portion 66 of the facing surface 7B abut, The uneven shape portion 62 of the facing surface 7A and the uneven shape portion 64 of the facing surface 7B are engaged. The concave grooves 8A and 8B constitute a hollow portion S by the contact between the flat portion 65 of the facing surface 7A and the flat portion 66 of the facing surface 7B, and the heat pipe 3 is included in the hollow portion S.

  As shown in FIG. 7, due to the pressurization described above, the fitting convex portion 61 is completely inserted into the fitting concave portion 63, so that it is bitten inwardly in the width direction, and the adjacent heat dissipation member The frame parts 6, 6,... Are connected in a state where movement in the separating direction is restricted.

  In addition, the fitting convex portion 61 is subjected to a force for returning to the original state toward the outside by the elastic force, and the distal end portion 612 of the fitting convex portion 61 is pressed against the inner wall 633. Because of this force, the frame parts 6, 6,... Of the adjacent heat radiating members are always urged in the proximity direction, so the heat pipe 3 and the frame part arranged between the frame parts 6, 6,. Is maintained, and the heat transfer efficiency from the heat pipe 3 to the frame portions 6, 6,... Is maintained.

  The opposing surfaces 7A and 7A are inclined surfaces facing inward, and the opposing surfaces 7B and 7B facing the opposing surfaces 7A and 7A are inclined surfaces corresponding to the inclinations of the opposing surfaces 7A and 7A. Yes. Since the facing surfaces 7A and 7A of the heat radiating member 2A are located inside the facing surfaces 7B and 7B of the heat radiating member 2B, the movement of the heat radiating member 2A in both directions is restricted by the facing surfaces 7B and 7B. Therefore, it is possible to prevent the occurrence of a situation in which adjacent heat dissipating members move relative to each other in the width direction and the heat pipes 3 loosely fitted in the concave grooves 8A and 8B constituting the hollow portion S are damaged.

  Further, the contact surface between the facing surface 7A and the facing surface 7B, that is, the boundary line between the connected heat dissipation members, is that the uneven shape portion 62 of the opposite surface 7A and the uneven shape portion 64 of the opposite surface 7B are engaged. Due to the uneven shape. Therefore, the contact area between the facing surfaces 7A and 7B can be secured, and the heat conducted to the frame portion on the facing surface 7A side and the frame portion on the facing surface 7B side can be easily conducted to each other due to the uneven shape. The bias of heat transfer from the heat pipe 3 to each heat radiating member can be prevented.

  Further, as shown in FIG. 8, the heat pipe 3 has partition walls 31, 31, 31, 31 that partition the inside of the pipe body 30 in a radial manner from the central axis of the pipe body 30 to the inner peripheral surface 30 a of the pipe body 30. Is provided. These partition walls 31, 31, 31 increase the radial strength of the heat pipe 3. Therefore, when the adjacent heat dissipating members 2 and 2 are stacked and connected, the heat pipe 3 is not easily crushed even in the connecting operation of the fitting convex portion 61 and the fitting concave portion 63 by pressurization. The flow of the working fluid filled in 3 is not hindered. Moreover, since the cross-sectional shape of the heat pipe 3 is maintained by the partition walls 31, 31, 31, 31, the heat pipe 3 is not easily crushed even if it is curved with a large curvature, and the heat pipe 3 is matched to the shape of the heat radiating housing 4. A compact shape can be obtained. The partition walls 31, 31, 31, 31 are provided over most of the longitudinal direction of the pipe body 30. However, the present invention is not limited to this, and for example, the heat radiating members 2, 2 are arranged in the longitudinal direction of the pipe body 30. It may be omitted in a portion that is not located between.

  As described above, the outer peripheral surface 3a of the heat pipe 3 can be brought into contact with the inner peripheral surface of the concave grooves 8A and 8B constituting the hollow portion S formed in the longitudinal direction of the frame portion 6 in the longitudinal direction. Therefore, a large contactable area between the outer peripheral surface 3a of the heat pipe 3 and the heat radiating member 2 can be secured, and the heat transfer efficiency is high. Therefore, the heat transfer efficiency between the heat radiating housing 4 and the heat pipe 3 is high, and the heat can reach the entire heat radiating housing 4. According to this, since heat can be radiated by the entire heat radiating housing 4, even a heat radiated device such as a semiconductor element having a high heat radiating efficiency and a large heat flux can be efficiently cooled.

  Further, as shown in FIG. 7, the concave grooves 8A and 8B each constitute a substantially semicircle of the circular hollow portion S, and therefore, in the adjacent frame portions 6 and 6, the outer peripheral surface 3a of the heat pipe 3 and The contactable areas are substantially the same, and heat is evenly transferred to the frame portions 6 and 6.

  Moreover, the heat radiating device 1 has a structure in which the heat radiating members 2, 2,... And the heat pipe 3 are integrated by the above-described connection structure of the heat radiating members 2, 2,. Therefore, mass productivity is high and cost is low.

  Further, since the heat pipe 3 is a meandering capillary type, it has a structure that does not have a so-called wick inside, and the movement of the refrigerant is not hindered in any direction. Therefore, one heat pipe can be formed in a substantially coil shape in accordance with the shape of the heat radiating housing 4.

  As shown in FIG. 2, the heat radiating housing 4 configured by connecting a plurality of heat radiating members 2, 20,... Is provided on one side (heat receiving surface) on the side of the ventilation surface 4 b arranged toward the wind power source side. The heat pipes 3 inserted around the hollow portions S, S,... Arranged on the opposite side from the hollow portions S, S,... Arranged on the surface 4a) side are adjacent to each other in the vertical direction (upward here). The part exposed to the outside of the heat pipe 3 is disposed so as to be obliquely overlapped with the ventilation surface 4 b of the heat radiating housing 4. According to this, the heat pipe 3 is cooled by the wind passing through the ventilation surface 4b of the heat radiating housing 4, and the heat radiation efficiency is supplementarily 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, as for the heat pipe 3 in the said Example, although one heat pipe is arrange | positioned through each hollow part S, S, ... of the thermal radiation housing | casing 4, the number of heat pipes is not restricted to this, For example, as in the modification shown in FIG. 9, the hollow portions S, S,... Arranged on one side (heat receiving surface 4a) side of the heat radiating housing 4 and the hollow portions S, S,. Heat pipes 13A and 13B may be arranged respectively.

  Moreover, although the heat radiating member 2, 20, ... in the said Example is a structure provided with the frame parts 6 and 6 on the both sides of the heat radiating plane part 5, it is not restricted to this structure, for example, it is one in the horizontal direction center of a heat radiating member. The frame portion may be arranged, and the heat radiation flat portion may be extended from the left and right ends of the frame portion.

  Further, the frame portion is not limited to the structure formed on the both sides of the heat radiation plane portion, but for example, in addition to both sides of the heat radiation plane portion, the substantially central portion in the left-right direction of the heat radiation member so as to divide the heat radiation plane portion in the left-right direction. A frame portion may be formed on the frame.

  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.

  In the embodiment, the heat radiating members 2, 20,... Are framed between adjacent heat radiating members by causing the fitting convex portion 61 to be engaged with the fitting concave portion 63 in the width direction by the pressurizing means. Although the configuration in which the movement in the separation direction between 6, 6,... Is restricted and described has been described, the present invention is not limited thereto, and may be connected using a fastening means such as a screw.

  Moreover, in the said Example, although the groove 8A, 8B demonstrated the structure which each comprises the substantially semicircle of the circular hollow part S, it is not restricted to this, For example, a heat pipe is completely in one opposing frame part. A concave groove having a depth to be inserted may be formed, and the concave groove of the other frame portion may be omitted. In this case, an opening portion of the concave groove in which the opposite surface of the other frame portion is formed in one frame portion. Is closed to constitute a hollow portion.

DESCRIPTION OF SYMBOLS 1 Heat radiating device 2, 20, ... Heat radiating member 3 Heat pipe 3a Heat pipe outer peripheral surface 4 Heat radiating housing 4a Heat radiating housing ventilation surface 5, 5 Heat radiating flat surface portions 6, 6 Frame portions 7A, 7B Opposing surfaces 8A, 8B Concave groove 9 , 9 Connecting portion 30 Piping body 30a Piping body inner peripheral surfaces 31, 31,... Partition wall 61 Fitting convex portion 63 Fitting concave portion 62, 64 Uneven shape portion 65, 66 Planar portion 611 Base end portion 612 Tip portion 631 Guide wall 632 Opening 633 Inner wall S Hollow part

Claims (6)

A heat dissipation device comprising a heat pipe and a heat dissipation member,
The heat dissipating member includes a frame portion extending substantially linearly and a thin heat dissipating flat surface portion formed continuously with the frame portion, and a plurality of the heat dissipating members are arranged in the thickness direction of the heat dissipating flat surface portion. ,
In the longitudinal direction of the frame portion of at least one of the opposed heat radiating members, a groove is formed on a surface facing the frame portion of the opposed radiating member, and is formed by the frame portion of the opposed radiating member and the groove. A heat radiating device, wherein the heat pipe is disposed in the hollow portion.   The heat dissipation device according to claim 1, wherein the heat pipe is of a single meandering capillary type, and the heat pipe is disposed across the groove of each frame portion.   The heat dissipation device according to claim 1, wherein the groove is formed in a frame portion of the opposing heat dissipation member. Concavities and convexities are respectively formed on the opposing surfaces of the frame portions of the opposing heat dissipation members,
The frame portion of the heat radiating member is formed at both end portions of the heat radiating flat surface portion, and an inclined surface facing inward is formed on the opposing surface of each frame portion of the one heat radiating member, along the thickness direction. Each of the opposing heat radiating members is provided with an inclined surface in contact with the inclined surface and an inwardly inclined surface. The heat radiating device according to any one of claims 1 to 3, wherein a fitting concave portion into which the fitting convex portion is engaged is formed.   The heat dissipation device according to any one of claims 1 to 4, wherein the heat pipe has a partition plate that partitions the interior into a plurality of spaces.   The heat radiating device according to claim 5, wherein the partition plate has a substantially cross-shaped cross section.

Images