JP2018162968A - Heat sink structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat sink structure which can uniform cooling of a plurality of heat generators installed in a narrowed internal space with a simple structure while having excellent heat transport characteristics by reliably preventing closure and narrowing of the internal space of a planar heat pipe.SOLUTION: A heat sink structure is thermally connected to a plurality of heat generators by being mounted on a plurality of heat generators, and is provided with a planar heat pipe whose plane part other than a heat receiving part thermally connected to the plurality of heat generators functions as a heat radiation part and a tubular heat pipe. In the heat sink structure, one end part of the tubular heat pipe is thermally connected as a heat receiving part to a peripheral edge part to be a plane shape of the planar heat pipe that functions as a heat radiation part of the planar heat pipe. The heat receiving part of the tubular heat pipe is flattened and extends along the planar heat pipe in a planar view; a radiation fin is provided for the heat radiation part of the tubular heat pipe. The tubular heat pipe is positioned at a part that does not overlap the plurality of heat generators in a planar view.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat sink structure excellent in cooling performance for a plurality of heating elements installed in a narrow internal space, for example, an internal space having a small dimension in the thickness direction.

  Electronic parts such as semiconductor elements mounted on electric / electronic devices have increased in calorific value due to high-density mounting accompanying higher functionality, and in recent years, cooling has become more important. In addition, due to the downsizing and thinning of electrical and electronic equipment, the internal space of the housing of electrical and electronic equipment is becoming increasingly narrow. A planar heat pipe may be used as a cooling means for electronic components installed in a narrowed internal space.

  As a cooling structure for an electronic component installed in an internal space having a small dimension in the thickness direction, a first heating element provided in the housing, a heat sink provided in the housing, a first pressing member, A flat plate-like first heat pipe having a first portion facing the first heating element and a second portion deviating from the first heating element and being bent by the pressing of the first pressing member; A cooling structure having a second heat pipe having a tubular container connected to a second portion of one heat pipe and a heat sink has been proposed (Patent Document 1).

  Moreover, in patent document 1, when the 2nd heat generating body is provided in the housing | casing, in addition to the flat plate-shaped 1st heat pipe, Furthermore, the 1st part facing the 2nd heat generating body, A flat plate-shaped third heat pipe having a second portion connected to the second heat pipe and deviating from the second heating element is provided.

  However, in Patent Document 1, since the flat heat pipe is bent by the pressing of the pressing member, that is, deformed in the vertical direction with respect to the flat surface, in the flat heat pipe with a thin container, the internal space In particular, the space in the thickness direction is blocked or narrowed, and there is a problem that the heat transport characteristic which is a function as a heat pipe is impaired.

  Further, in Patent Document 1, when cooling a plurality of heating elements, flat heat pipes that are separate from each other are connected to the respective heating elements, and the flat heat pipes are respectively tubular. It needs to be connected to a second heat pipe, which is a main heat pipe, having a container. Therefore, the dimensions of the flat heat pipe must be adjusted according to the position of the heating element, and there is a problem that the number of parts increases and the structure becomes complicated.

  Moreover, in patent document 1, since the flat heat pipe which is a mutually separate body is connected to each heat generating body, if the heat generating amount of several heat generating bodies differs, especially heat_generation | fever which has a big heat generating amount. There was a problem that the body might not be cooled sufficiently.

JP 2011-106793 A

  In view of the above circumstances, the present invention reliably prevents the internal space of the planar heat pipe from being blocked or narrowed, and has an excellent heat transport characteristic, and a narrow internal space with a simple configuration. It is an object of the present invention to provide a heat sink structure that can uniformly cool a plurality of heating elements installed in a heat sink.

  Aspects of the present invention include a planar heat pipe that is mounted on a plurality of heating elements and thermally connected to the plurality of heating elements, and heat is generated by a heat radiating unit and a heat receiving unit of the planar heat pipe. And a heat sink structure having a tubular heat pipe connected thereto.

  In the above aspect, the planar heat pipe is placed on the plurality of heating elements, so that it is thermally connected to the plurality of heating elements, and is fixed to the heating element. In the said aspect, the site | part to which the heat generating body was thermally connected among planar heat pipes functions as a heat receiving part. Moreover, the site | part to which the tubular heat pipe was thermally connected among planar heat pipes functions as a thermal radiation part. Of the tubular heat pipe, a portion where the planar heat pipe is thermally connected functions as a heat receiving portion. In the above aspect, since the plurality of heating elements are thermally connected to the planar heat pipe, the plurality of heating elements are thermally connected to one planar heat pipe, that is, the same planar heat pipe. The

  An aspect of the present invention is a heat sink structure in which heat exchange means is provided in a heat radiating portion of the tubular heat pipe.

  An aspect of the present invention is a heat sink structure in which the heat exchanging means has heat radiating fins.

  An aspect of the present invention is a heat sink structure in which the heat exchange means and / or the heat radiating portion of the tubular heat pipe is cooled by cooling air from a blower fan.

  An aspect of the present invention is a heat sink structure in which an urging member is provided on the planar heat pipe, and the urging member is fixed to a support member of the heating element.

  According to the aspect of the present invention, since the planar heat pipe is placed on the plurality of heating elements and thermally connected to the plurality of heating elements, the internal space of the planar heat pipe is blocked. And narrowing can be reliably prevented, and as a result, excellent heat transport characteristics can be exhibited.

  Further, according to the aspect of the present invention, since the plurality of heating elements are thermally connected to one flat heat pipe, the number of parts of the flat heat pipe can be reduced and the structure can be simplified. Further, according to the aspect of the present invention, a plurality of heating elements are thermally connected to one flat heat pipe, and the flat heat pipe heats a tubular heat pipe having excellent heat transport characteristics in a predetermined direction. Therefore, even if the heat generation amounts of the plurality of heat generating elements are different, the flat heat pipe can equalize the heat generating elements, and thus the cooling of the heat generating elements can be made uniform. Furthermore, according to the aspect of the present invention, since the heating element is thermally connected to the planar heat pipe, even in a narrow inner space, for example, a heating element installed in an inner space having a small dimension in the thickness direction, Can be cooled reliably.

  According to the aspect of the present invention, the heat exchange means is provided in the heat radiating portion of the tubular heat pipe, so that the heat radiating characteristic of the tubular heat pipe is improved, and even a heating element installed in a narrow internal space is reliably cooled. it can.

It is explanatory drawing of the side view of the heat sink structure which concerns on the example of 1st Embodiment of this invention. It is explanatory drawing of planar view of the heat sink structure which concerns on the example of 1st Embodiment of this invention. It is explanatory drawing of planar view of the heat sink structure which concerns on the 2nd Example of this invention. It is explanatory drawing of the side view of the heat sink structure which concerns on the example of 3rd Embodiment of this invention. (A) is a side view of the heat sink structure according to the fourth embodiment of the present invention, and (b) is a plan view of the heat sink structure according to the fourth embodiment of the present invention. is there. (A) The figure is explanatory drawing of the side view of the heat sink structure which concerns on 5th Example of this invention, (b) Drawing is explanatory drawing of the planar view of the heat sink structure which concerns on 5th Embodiment of this invention. is there.

  The heat sink structure according to the first embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the heat sink structure 1 according to the first embodiment includes a planar heat pipe 10 and a tubular heat pipe 12 thermally connected to the planar heat pipe 10. . In the heat sink structure 1, the planar container 11 of the planar heat pipe 10 and the tubular container 13 of the tubular heat pipe 12 are in direct contact with each other so that the planar heat pipe 10 and the tubular heat pipe 12 are thermally connected. Yes.

  In addition, a plurality of heating elements mounted on the substrate 102 (two heating elements, the first heating element 100 and the second heating element 101 in FIG. 1) are thermally connected to the planar heat pipe 10. Has been. That is, the first heating element 100 and the second heating element 101 are thermally connected to the same planar heat pipe 10. Accordingly, the first heating element 100 and the second heating element 101 are thermally connected via the planar heat pipe 10. A portion of the flat heat pipe 10 where the first heat generating body 100 and the second heat generating body 101 are thermally connected functions as a heat receiving portion of the flat heat pipe 10.

  The planar heat pipe 10 is thermally connected to the first heating element 100 and the second heating element 101 by being placed on the first heating element 100 and the second heating element 101, and It has been fixed.

  In the heat sink structure 1, the flat heat pipe 10 may be placed so as to be in direct contact with the first heat generating body 100 and the second heat generating body 101. 10 may be inserted between the first heating element 100 and the second heating element 101.

  As shown in FIGS. 1 and 2, the peripheral edge of the planar heat pipe 10 that is a predetermined distance away from the portion of the planar heat pipe 10 where the first heating element 100 and the second heating element 101 are thermally connected. One end portion 14 of the tubular heat pipe 12 is thermally connected to the portion. In the heat sink structure 1, one tubular heat pipe 12 is thermally connected to the peripheral portion of the planar heat pipe 10. Of the flat heat pipe 10, a portion where one end 14 of the tubular heat pipe 12 is thermally connected functions as a heat radiating portion of the flat heat pipe 10.

  The method of thermally connecting the planar heat pipe 10 and the tubular heat pipe 12 is not particularly limited. For example, the tubular container 13 of the tubular heat pipe 12 is soldered to the planar container 11 of the planar heat pipe 10. The flat heat pipe 10 and the tubular heat pipe 12 can be thermally connected by fixing by attaching, caulking, or the like.

  One end 14 of the tubular heat pipe 12 thermally connected to the planar heat pipe 10 functions as a heat receiving portion of the tubular heat pipe 12. On the other hand, portions of the tubular heat pipe 12 other than the one end portion 14, that is, the center portion 15 and the other end portion 16 are not in contact with the planar heat pipe 10. Among these, the other end portion 16 of the tubular heat pipe 12 functions as a heat radiating portion of the tubular heat pipe 12. Note that, unlike the planar heat pipe 10, no heating element is connected to the tubular heat pipe 12. The tubular heat pipe 12 may be bent as shown in FIGS. 1 and 2 or may be used in a linear shape. Moreover, in order to improve thermal connectivity, the tubular heat pipe 12 may be partially or entirely flattened.

  In the heat sink structure 1, radiating fins 17 are attached to the other end portion 16 of the tubular heat pipe 12 (that is, the heat radiating portion of the tubular heat pipe 12) as heat exchange means. A blower fan 103 is disposed between the heat radiating fins 17 and the planar heat pipe 10. Cooling air from the blower fan 103 is supplied to the radiation fins 17.

  In the heat sink structure 1, the plurality of heat radiation fins 17 are attached to the other end portion 16 of the tubular heat pipe 12, so that heat is smoothly released from the heat radiation portion of the tubular heat pipe 12 to the external environment. Further, since the blower fan 103 is disposed between the heat radiation fins 17 and the planar heat pipe 10, the blower fan 103 is operated, so that not only cooling air is supplied to the heat radiation fins 17, but also a flat surface. An air flow is generated from the mold heat pipe 10 toward the radiation fins 17, and this air flow also functions as cooling air for cooling the planar heat pipe 10.

  The flat heat pipe 10 includes a flat container 11, a working fluid (not shown) sealed in the internal space of the flat container 11, and a wick structure (not shown) provided in the internal space of the flat container 11. Z). The tubular heat pipe 12 includes a tubular container 13, a working fluid (not shown) sealed in the inner space of the tubular container 13, and a wick structure (not shown) provided in the inner space of the tubular container 13. And have.

  Examples of the material for the flat container 11 and the tubular container 13 include copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, stainless steel, titanium, and the like. Further, the working fluid can be appropriately selected according to the compatibility with the material of the planar container 11 and the tubular container 13, and examples thereof include water, fluorocarbons such as chlorofluorocarbons and fluorinate, and cyclopentane. Can do.

  Examples of the wick structure include a sintered body of metal powder such as copper powder, a metal mesh, a wire, a groove formed on the inner surface of the flat container 11 and the tubular container 13.

  The heating element to be cooled is not particularly limited, but a central processing unit, graphic chip (GPU, VGA), memory, capacitor, power supply mounted on the substrate 102 (for example, a circuit board built in an electronic device). Etc.

  Next, the mechanism of the cooling action of the heat sink structure 1 will be described. When the heat receiving part of the flat heat pipe 10 receives heat from the first heat generating element 100 and the second heat generating element 101, the heat receiving part of the flat heat pipe 10 is connected to one end 14 of the tubular heat pipe 12. The heat from the first heating element 100 and the second heating element 101 is transported to the heat radiating part of the flat heat pipe 10. A flat surface portion other than the heat receiving portion of the flat heat pipe 10 functions as a heat radiating portion of the flat heat pipe 10. Part of the heat transported from the heat receiving portion of the planar heat pipe 10 to the heat radiating portion is from the heat radiating portion of the flat heat pipe 10 to one end 14 of the tubular heat pipe 12, that is, the heat receiving portion of the tubular heat pipe 12. Is transmitted to. The heat transferred to the heat receiving portion of the tubular heat pipe 12 is transported to the other end portion 16 of the tubular heat pipe 12, that is, the heat radiating portion of the tubular heat pipe 12. To the outside environment.

  That is, the heat of the first heating element 100 and the second heating element 101 received by the flat heat pipe 10 is transported to the site of the radiation fin 17 by the tubular heat pipe 12, so that it can be smoothly transferred to the external environment. Can be released.

  Since the heat sink structure 1 is thermally connected to the first heating element 100 and the second heating element 101 while being placed on the first heating element 100 and the second heating element 101, it is flat. It is possible to reliably prevent the internal space of the mold heat pipe from being blocked and narrowed, and thus exhibit excellent heat transport characteristics, and to reliably cool a plurality of heating elements.

  Further, in the heat sink structure 1, a plurality of heating elements (the first heating element 100 and the second heating element 101) are thermally connected to one planar heat pipe 10. The number of points can be reduced and the heat sink structure 1 can be simplified. Further, in the heat sink structure 1, a plurality of heating elements are thermally connected to one flat heat pipe 10, and the flat heat pipe 10 is heated to the tubular heat pipe 12 that transports heat to the installation site of the radiation fins 17. Therefore, even if the heat generation amounts of the plurality of heat generating elements are different, the flat heat pipe 10 can equalize the heat generating elements, and thus can uniformly cool the heat generating elements. Further, in the heat sink structure 1, since each heating element is thermally connected to the planar heat pipe, even in the case of a heating element installed in a narrow internal space, for example, an internal space having a small dimension in the thickness direction, it is ensured. Can be cooled.

  Next, a heat sink structure according to a second embodiment of the present invention will be described with reference to the drawings. The same components as those of the heat sink structure according to the first embodiment of the present invention will be described using the same reference numerals.

  In the heat sink structure 1 according to the first embodiment, one tubular heat pipe 12 is thermally connected to the peripheral portion of the planar heat pipe 10, but instead of this, the second embodiment is used. In the heat sink structure 2, as shown in FIG. 3, two tubular heat pipes 12 and 12 ′ are thermally connected to the peripheral portion of the planar heat pipe 10.

  In the heat sink structure 2, the tubular heat pipe 12 is not only thermally connected to a predetermined portion of the peripheral portion of the planar heat pipe 10, but also the planar heat pipe 10 facing the tubular heat pipe 12. Another tubular heat pipe 12 'is thermally connected to the position of the peripheral edge. Note that, similarly to the heat radiating portion of the tubular heat pipe 12, heat radiating fins 17 are also provided in the heat radiating portions of the other tubular heat pipes 12 '.

  Even if the two tubular heat pipes 12 are thermally connected to the peripheral edge of the planar heat pipe 10, a plurality of heating elements can be reliably cooled as in the heat sink structure 1. That is, the number of the tubular heat pipes 12 that are thermally connected to the planar heat pipe 10 is not particularly limited, and may be one or more, depending on use conditions such as the amount of heat generated by the heating element and the number of heating elements. Can be appropriately selected.

  Next, a heat sink structure according to a third embodiment of the present invention will be described with reference to the drawings. The same components as those of the heat sink structure according to the first and second embodiments of the present invention will be described using the same reference numerals.

  In the heat sink structure 1 according to the first embodiment, the planar heat pipe 10 is thermally contacted directly with each heating element (the first heating element 100 and the second heating element 101) or through heat conductive grease. However, instead of this, in the heat sink structure 3 according to the third embodiment, as shown in FIG. 4, a heat conductive member 18 is inserted between the planar heat pipe 10 and the heating element. ing. In the heat sink structure 3, the third heating element 104, that is, three heating elements are mounted on the substrate 102 in addition to the first heating element 100 and the second heating element 101.

  The above aspect is particularly effective when the first heating element 100, the second heating element 101, and the third heating element 104 have different height dimensions. That is, the heat conductive member 18 is inserted between the heating element (the second heating element 101 and the third heating element 104 in FIG. 4) and the flat heat pipe 10 having a small dimension in the height direction, The heating element has the same height as that of the heating element having the largest dimension in the height direction (first heating element 100 in FIG. 4). As a result, a plurality of heating elements (first heating element 100, second heating element 101, and third heating element 104) and the planar heat pipe 10 can be obtained without deforming the planar heat pipe 10 such as bending. Can be connected thermally.

  As the heat conductive member 18, a heat conductive sheet etc. can be mentioned, for example. In FIG. 4, thermal conductive grease 19 is applied to the contact surface between the first heating element 100 and the flat heat pipe 10 in order to improve thermal conductivity.

  Next, a heat sink structure according to a fourth embodiment of the present invention will be described with reference to the drawings. The same components as those of the heat sink structure according to the first, second, and third embodiments of the present invention will be described using the same reference numerals.

  As shown in FIGS. 5A and 5B, in the heat sink structure 4 according to the fourth embodiment, a biasing member 20 is further provided on the surface (back surface) of the flat heat pipe 10 on the heating element side. Yes. Since the biasing member 20 is provided on the back surface of the planar heat pipe 10, the planar heat pipe 10 is prevented from being deformed such as bending, and the planar heat pipe 10 is connected to the first heating element 100 and the second heating element 100. The heating element 101 can be biased. Therefore, the thermal connectivity between the planar heat pipe 10 and the first and second heating elements 100 and 101 is improved, and the planar heat pipe 10 can be securely fixed to the substrate 102. The tubular heat pipe 12 is attached to a surface (surface) that is not the heating element side of the flat heat pipe 10.

  In the heat sink structure 4, two urging members 20 are provided on the back surface of the planar heat pipe 10. The respective urging members 20 are arranged at the peripheral edge of the planar heat pipe 10 so as to face each other. In addition, each heating element (the first heating element 100 and the second heating element 101) is disposed between the two biasing members 20. Accordingly, the planar heat pipe 10 in a state of being urged toward the substrate 102 is thermally connected to all the heating elements. The biasing member 20 is fixed to the substrate 102 on which the first heating element 100 and the second heating element 101 are mounted.

  The urging member 20 includes a first flat portion 20-1 attached in a state of surface contact with the back surface of the planar heat pipe 10, and a second flat portion 20-2 attached in a state of surface contact with the substrate 102. And a connecting portion 20-3 that connects the first flat portion 20-1 and the second flat portion 20-2. The connecting portion 20-3 exhibits an urging action.

  The means for attaching the first flat portion 20-1 to the back surface of the planar heat pipe 10 is not particularly limited, and examples thereof include soldering. The means for fixing the second flat portion 20-2 to the substrate 102 is not particularly limited, and in the heat sink structure 4, the second flat portion 20-2 is fixed to the substrate 102 with screws 21. That is, the second flat portion 20-2 is provided with a through hole (not shown) through which the screw 21 is inserted, the substrate 102 is provided with a screw hole (not shown), and the screw 21 is used as a through hole. The biasing member 20 is fixed to the substrate 102 by being inserted and screwed into the screw hole.

  Examples of the urging member 20 include a spring member such as a metal leaf spring or a coil.

  Next, a heat sink structure according to a fifth embodiment of the present invention will be described with reference to the drawings. The same components as those of the heat sink structure according to the first, second, third, and fourth embodiments of the present invention will be described using the same reference numerals.

  In the heat sink structure 4 according to the fourth embodiment, the planar heat pipe 10 in a state of being urged toward the substrate 102 is thermally connected to all the heating elements. In the heat sink structure 5 according to the fifth embodiment, as shown in FIGS. 6A and 6B, a plurality of heating elements (in FIG. 6, the first heating element 100 and the second heating element 101 are formed. Of the two heating elements), only a part of the heating elements (in FIG. 6, the first heating element 100), the planar heat pipe 10 that is biased toward the substrate 102 is thermally It is connected. Further, the planar heat pipe 10 is provided with a through hole 22 through which the screw 21 is inserted, and the biasing member 20 is also provided with a through hole (not shown) through which the screw 21 is inserted. The substrate 102 is provided with a screw hole (not shown). The planar heat pipe 10 and the urging member 20 are inserted into the through hole 22 of the planar heat pipe 10 and the through hole of the urging member 20 and screwed into the threaded holes of the substrate 102, respectively. It is fixed to the substrate 102.

  Further, as shown in FIG. 6B, in the heat sink structure 5, the first heating element 100 is disposed between the two biasing members 20, but the second heating element 101 is not disposed. . A portion of the flat heat pipe 10 that is not biased toward the substrate 102 is thermally connected to the second heating element 101. Further, a thermal conductive member 18 such as a thermal conductive sheet is inserted between the second heat generating body 101 and the planar heat pipe 10, and the planar heat pipe is provided by a buffering function of the thermal conductive member 18. 10 is also biased toward the first heating element 100.

  Even in the above aspect, the thermal connectivity between the planar heat pipe 10 and the first heating element 100 is improved while preventing deformation such as bending of the planar heat pipe 10, and the planar heat pipe 10 is reliably secured. It can be fixed to the substrate 102.

  Next, another embodiment of the present invention will be described. In each of the above embodiments, the heat radiating fins are provided as the heat exchanging means in the heat radiating portion of the tubular heat pipe. However, the heat exchanging means may not be provided depending on the use situation. Moreover, in each said embodiment, although the ventilation fan was installed in the radiation fin vicinity, it is not necessary to install a ventilation fan according to a use condition.

  In the heat sink structure according to the first and fourth embodiments, the planar heat pipe is placed in direct contact with each heating element or via thermal conductive grease. However, the heating element and the planar heat pipe are You may arrange | position a heat conductive member between these.

  Since the heat sink structure of the present invention has excellent heat transport characteristics and can uniformly cool a plurality of heating elements installed in a narrowed internal space with a simple configuration, for example, in the thickness direction The utility value is high in the field of cooling a plurality of heating elements installed in a small space.

1, 2, 3, 4, 5 Heat sink structure 10 Planar heat pipe 12 Tubular heat pipe 17 Radiating fin 20 Biasing member

Claims (5)

A planar type in which a planar part other than the heat receiving part that is thermally connected to the plurality of heating elements by being mounted on the plurality of heating elements functions as a heat dissipation part. A heat pipe, a tubular heat pipe, and functioning as a heat radiating portion of the flat heat pipe. The flat edge of the flat heat pipe has one end portion of the tubular heat pipe as a heat receiving portion. Is a heat sink structure that is thermally connected as
The heat receiving portion of the tubular heat pipe is flattened and extends along the flat heat pipe in a plan view,
Radiation fins are provided in the heat radiation part of the tubular heat pipe,
The said tubular heat pipe is a heat sink structure located in the site | part which does not overlap with these heat generating bodies in planar view.   The heat sink structure according to claim 1, wherein the tubular heat pipe is disposed in a direction of the plurality of heating elements with respect to the planar heat pipe.   The heat sink structure according to claim 1 or 2, wherein a heat conductive member is inserted between the heat generating element having a small dimension in the height direction and the planar heat pipe among the plurality of heat generating elements.   The heat sink structure of any one of Claims 1 thru | or 3 with which the thermal radiation part of the said radiation fin and / or the said tubular heat pipe is cooled with the cooling air of a ventilation fan.   The heat sink structure according to any one of claims 1 to 4, wherein a biasing member is provided on the planar heat pipe, and the biasing member is fixed to a support member of the heating element.

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