JP2006130753A - Heat conductive panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat conductive panel which enables the rapid and efficient transmission of heat in a surface direction and is low in cost. <P>SOLUTION: A metal sheet 11 such as an aluminum sheet or the like and a plurality of carbon graphite sheets 12 are mutually bonded through adhesive layers 13 to especially enhance heat conductivity in the surface direction by utilizing the features such as flexibility, compression elasticity, the good compatibility with a partner material and the like of the carbon graphite sheets 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat conductive panel, and more particularly to a heat conductive panel having good heat conduction in a surface direction.

  Conventionally, an aluminum material has been widely used as a heat conducting material. For example, a heat sink in which a slit is formed is used to radiate heat generated electrical components, and heat is released to the atmosphere by contact between the surface of the heat sink and the atmosphere. In addition, when it is desired to transmit heat uniformly or to cool the whole, measures such as surrounding with a heat conductive metal plate are taken.

  However, a heat conductive metal typified by aluminum has a good heat conductivity in the thickness direction, but has a drawback that the heat transfer speed in the surface direction is slow when a panel-like material is used. Therefore, particularly when the dimension in the surface direction is large, there is a drawback that heat cannot be transmitted uniformly in the surface direction.

  The subject of this invention is providing the heat conductive panel excellent in heat conductivity by the surface direction.

  Another object of the present invention is to provide a thermally conductive panel that improves the thermal conductivity in the plane direction and thereby can transfer heat uniformly in the plane direction.

  Still another object of the present invention is to provide a thermally conductive panel that does not increase the weight and improves the thermal conductivity in the surface direction.

  Yet another object of the present invention is to provide a thermally conductive panel that is low in cost and can transfer heat in a plane direction.

  The above-described problems and other problems of the present invention will be clarified by the technical idea of the present invention and the embodiments thereof described below.

  The main invention of the present application relates to a heat conductive panel in which a heat conductive metal plate and a carbon graphite sheet are joined to form a laminated structure.

  Here, you may join a carbon graphite sheet to both surfaces of a heat conductive metal plate. Further, a carbon graphite sheet may be sandwiched between a plurality of thermally conductive metal plates, and the carbon graphite sheet may be bonded to the outer surface of the thermally conductive metal plate. Further, a carbon graphite sheet may be sandwiched between a plurality of thermally conductive metal plates so that the thermally conductive metal plate is exposed on the outer surface. Further, a decorative film or a decorative sheet may be bonded to the outer surface. The heat conductive metal plate may be an aluminum plate.

  The main invention of the present application is a laminated structure in which a heat conductive metal plate and a carbon graphite sheet are joined.

  Therefore, according to such a thermal conductive panel, the thermal conductivity in the plane direction is improved by the carbon graphite sheet bonded to the thermal conductive metal plate, and heat is transmitted not only in the thickness direction but also in the plane direction. It becomes possible.

  The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 and FIG. 2 show a heat conductive panel of the present embodiment, and this heat conductive panel is composed of a joined structure of an aluminum plate 11 and a carbon graphite sheet 12. That is, the carbon graphite sheet 12 is joined to both sides of the intermediate aluminum plate 11 to form a laminated structure. In addition, as the aluminum plate 11, the aluminum plate 11 which exists in the range of 0.1-5 mm and has the intensity | strength according to the objective is used.

  The carbon graphite sheet 12 joined to the aluminum plate 11 is made of carbon. In general, carbon exists stably in the form of diamond, graphite (graphite), and amorphous carbon. In particular, graphite is black and opaque, has a hexagonal crystal structure, and is an electrical and thermal conductor. In particular, graphite (graphite) exists in nature. And a graphite sheet is obtained by rolling natural graphite. Further, when an organic synthetic film such as an acrylic resin film using acrylonitrile is baked in the absence of oxygen, a sheet-like graphite is obtained.

  A sheet-like graphite has flexibility and compression elasticity, and has a characteristic that it is compatible with the counterpart material. In the present embodiment, a thermal conductive panel is constituted by the joining structure of the graphite sheet 12 and the aluminum plate 11 by utilizing the thermal characteristics of the graphite sheet, that is, the property of being a good thermal conductor. is doing.

Regarding the thermal conductivity of the carbon graphite sheet 12, the carbon constituting the graphite sheet 12 has a layered structure, the in-plane thermal conductivity of the graphite sheet 12 has a value of 250 to 600 W / mK, and aluminum or copper It has a higher thermal conductivity than other metals, and has a light density of about 1 gm / cm ³ . Moreover, it has electrical conductivity as well as high thermal conductivity. In addition, the thickness of the sheet can be reduced, whereby the thickness when bonded to the aluminum plate 11 can be suppressed.

  The heat conductive panel of this embodiment is obtained by bonding carbon graphite sheets 12 to both sides of an aluminum plate 11 with an adhesive layer 13 as shown in FIG. Here, as the adhesive layer, for example, an adhesive such as an epoxy resin may be used. As for the carbon graphite sheet 12, it is preferable to use a sheet in which a polyester film is bonded to both sides thereof.

  Such a thermally conductive panel produces excellent thermal conductivity as a panel due to the thermal conductivity of the carbon graphite sheets 12 respectively bonded to both surfaces of the aluminum plate 11. In particular, as described above, since the carbon graphite sheet 12 has excellent thermal conductivity in the surface direction, it has a feature that heat is rapidly transmitted not in the thickness direction of the panel but in the surface direction.

  FIG. 3 shows another embodiment of a thermally conductive panel. Here, two aluminum plates 11 are used, and a carbon graphite sheet 12 is disposed between the aluminum plates 11 and bonded to the aluminum plates 11 on both sides via an adhesive layer 13. The carbon graphite sheets 12 are bonded to the outer surfaces of the aluminum plates 11 on both sides via the adhesive layer 13 respectively. Therefore, in this embodiment, a laminated structure of two aluminum plates 11 and three carbon graphite sheets 12 is formed. Also here, the carbon graphite sheets 12 alternately laminated with the aluminum plates 11 provide a heat conductive panel having excellent heat conductivity particularly in the surface direction.

  FIG. 4 shows still another embodiment. In this embodiment, a carbon graphite sheet 12 is joined between aluminum plates 11 on both sides. Here again, an adhesive layer 13 is interposed between the carbon graphite sheet 12 and the aluminum plates 11 on both sides. Therefore, even with such a configuration, a thermally conductive panel having excellent thermal conductivity in the surface direction can be obtained.

  FIG. 5 shows yet another embodiment. In this embodiment, a carbon graphite sheet 12 is bonded to both sides of a central aluminum plate 11 via an adhesive layer 13, and a decorative film 14 is bonded to the outer surfaces of the carbon graphite sheets 12 on both sides. . The decorative film 14 is opaque and gives the panel a good appearance. Therefore, design elements such as various patterns may be formed on the surface of the decorative film 14 by a method such as printing.

  According to such a configuration, excellent thermal conductivity in the surface direction can be imparted to the panel by the carbon graphite sheet 12 bonded to both sides. Moreover, the design property excellent in the decorative film 14 joined to the outer surface will be provided.

  The heat conductive panels of the various embodiments described above are used as a partition plate 22 inside the cold box 20 as shown in FIG. 6, for example. Here, a cold heat source 21 is disposed below the cool box 20, a partition plate 22 is disposed so as to be in contact with the cold heat source 21, and a partition plate 22 is formed in a stepped manner thereon so as to be in contact with the partition plate 22. They are arranged in a stack. And the cold heat from the cold source 21 will be rapidly transmitted to the upper part of this cool box 20 by the heat conduction of the partition plate 22 in the surface direction, so that the entire cool box 20 can be cooled at high speed. become.

  Although the present invention has been described above with reference to the illustrated embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention. For example, the joining structure of the aluminum plate 11 and the carbon graphite sheet 12 can take various laminated structures other than the forms shown in FIGS. 2 to 5, and the number of aluminum plates 11 and carbon graphite sheets 12 to be laminated. Can be arbitrarily changed. Such a heat conductive panel is not limited to the partition plate 22 of the cool box 20 as shown in FIG. 6, but can be widely used for other parts that require heat conductivity. Alternatively, it can be used as a lining for a freezer of a freezer car or as a lining material for a freezer showcase.

  The present invention can be used as an interior plate for a refrigerator, a refrigerator, a freezer car, a freezer showcase, and the like.

It is a disassembled perspective view of the heat conductive panel of 1st Embodiment. It is a longitudinal cross-sectional view of the same heat conductive panel. It is a longitudinal cross-sectional view of the heat conductive panel of another embodiment. It is a longitudinal cross-sectional view of the heat conductive panel of another embodiment. It is a longitudinal cross-sectional view of the heat conductive panel of another embodiment. It is a longitudinal cross-sectional view of the cool box to which the heat conductive panel is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Aluminum plate 12 Carbon graphite sheet 13 Adhesive layer 14 Cosmetic film 20 Cold storage 21 Cold heat source 22 Partition plate

Claims (6)

  A heat conductive panel in which a heat conductive metal plate and a carbon graphite sheet are joined to form a laminated structure.   The heat conductive panel according to claim 1, wherein carbon graphite sheets are bonded to both surfaces of the heat conductive metal plate.   2. The heat conductive panel according to claim 1, wherein a carbon graphite sheet is sandwiched between a plurality of heat conductive metal plates, and the carbon graphite sheet is bonded to the outer surface of the heat conductive metal plate. .   2. The heat conductive panel according to claim 1, wherein a carbon graphite sheet is sandwiched between a plurality of heat conductive metal plates, and the heat conductive metal plates are exposed on an outer surface.   The heat conductive panel according to claim 1, wherein a decorative film or a decorative sheet is bonded to the outer surface. The thermally conductive panel according to any one of claims 1 to 4, wherein the thermally conductive metal plate is an aluminum plate.

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