JP2001153576A - Carbon fiber skin heat pipe panel and heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pipe panel for carbon fiber skin heat pipe panels with high thermal performance and structural strength for manufacturing the carbon fiber skin heat pipe panel with high thermal performance and structural strength as compared with before. SOLUTION: By providing a step in one portion of a heat pipe for carbon fiber skin heat pipe panels, the adhesion layer of a flexible adhesive between a skin and the heat pipe can be made thick only at a part where thermal stress is concentrated, thus manufacturing the carbon fiber skin heat pipe panel with a higher thermal performance and structural strength as compared with a conventional carbon fiber skin heat pipe panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbon fiber skin heat pipe panel used, for example, as a part of a structural panel constituting an artificial satellite. Satellites usually consist of a plurality of such sandwich-structured panels, of which carbon fiber skin heat pipe panels are used as panels to which particularly high heat-generating equipment such as power amplifiers for transmission are attached. .

[0002]

2. Description of the Related Art FIG. 2 shows a typical carbon fiber skin heat pipe panel, wherein 1 is an inner skin (on the inner surface of the artificial satellite), 2 is an outer skin (the outer surface of the artificial satellite), and 3 is a heat pipe. 4 is a honeycomb core. The carbon fiber skin heat pipe panel is made of a flexible material between the heat pipe and the skin in order to prevent breakage due to thermal stress caused by a difference in thermal expansion coefficient between the metal heat pipe and the skin material carbon fiber.
In general, the structural adhesive 6 having higher adhesive strength is used for the other parts.

[0003]

However, since the adhesive strength of the flexible adhesive is inferior to other structural adhesives in terms of strength, it is difficult to bond the heat pipe to the inner skin and the heat pipe to the outer skin. It is common to use it in a limited manner. In addition, for example, when the heat pipe has a curved portion in the plane of the panel, thermal stress due to the difference in linear expansion coefficient between the skin and the heat pipe concentrates on the skin in that part, so that the seat is seated on the skin. When such a heat pipe is embedded in a panel, the adhesive layer of a flexible adhesive for bonding between the heat pipe and the skin must be thickened because the possibility of bending is increased. However, when the thickness of the flexible adhesive is increased, the thermal conductivity between the heat pipe and the skin is reduced, so the thermal performance inherent in the carbon fiber skin heat pipe panel is reduced, and compared with the structural adhesive. Since the adhesive layer of the flexible adhesive having a weak adhesive force becomes thick, the structural strength is also reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a heat pipe is thinned only at a portion where thermal stress is expected to occur between the heat pipe and the skin, so that the heat pipe is heated only at a necessary place. The thickness of the adhesive layer of the flexible adhesive used for bonding between pipes can be increased. Further, in this case, since the thickness of the adhesive layer of the flexible adhesive in other portions does not increase, a carbon fiber skin heat pipe panel having higher thermal performance and structural strength than the conventional one is provided. Is what you do.

[0005]

According to the present invention, a step is provided in a portion of a heat pipe where a large thermal stress is generated when the heat pipe is bonded to a skin.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a schematic diagram of a heat pipe for a carbon fiber skin heat pipe panel showing Embodiment 1 of the present invention. Details will be described with reference to FIG. As shown in (a), a step 7 is formed on the heat pipe 3 in which a large thermal stress is generated at a bonding portion between the heat pipe 3 and the skin 1, 2 as shown in (b).
The carbon fiber skin heat pipe panel can be structured without increasing the thickness of the adhesive layer between the other parts and the skins 1 and 2.

[0007]

According to the present invention, the adhesive layer of the flexible adhesive can be thickened only in the portion where the thermal stress is concentrated, so that the thermal performance and the heat performance can be improved as compared with the conventional carbon fiber skin heat pipe panel. A carbon fiber skin heat pipe panel having high structural strength can be manufactured.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment according to the present invention.

FIG. 2 is a schematic view of a general carbon fiber skin heat pipe panel.

[Explanation of symbols]

1 inner skin, 2 outer skin, 3 heat pipes,
4 Honeycomb core, 5 structural adhesive, 6 flexible adhesive, 7 steps.

Claims (2)

[Claims] In a carbon fiber skin heat pipe panel having a sandwich structure in which a heat pipe and a honeycomb core are sandwiched between an inner skin and an outer skin, a portion where thermal stress due to a difference in linear expansion coefficient between the skin and the heat pipe is concentrated. A carbon fiber skin heat pipe panel, wherein a step is provided in a part of the heat pipe below the skin. 2. A heat pipe characterized in that only a portion where thermal stress is generated between the heat pipe and the skin of the heat pipe is thinned.