JP2012132494A - Multilayer heat insulating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problematic point that films are in a substantially contact state at a bundling portion between layers in a conventional multilayer heat insulating material, thus reducing the heat insulation property thereof.SOLUTION: A sheet-like layered body S is formed by a plurality of heat insulating films 1 having a low thermal-radiative surface, and a heat insulating separator 2 arranged between the heat insulating films 1, and a multilayered heat insulating material A1 has a heat insulating member 3 interposed between layers of the heat insulating film 1 and a string-like member 4 as a locking member for bundling the heat insulating film 1, the heat insulating separator 2, and the heat insulating member 3 in the multilayer direction, with respect to any position in a plane of the laminated body S, so that heat conduction at the bundling portion between layers is suppressed, and improvement in the heat insulation property is achieved.

Description

  The present invention relates to a multilayer heat insulating material used as an exterior material in various spacecraft such as artificial satellites and space stations.

  Examples of this type of multilayer heat insulating material include those described in Non-Patent Documents 1 and 2. The multilayer heat insulating materials described in Non-Patent Documents 1 and 2 are called MLI (Multilayer insulation), and obtain a high heat insulating performance by laminating a plurality of resin films deposited with a metal such as aluminum. is there. In addition, in this multilayer heat insulating material, as described in Non-Patent Document 2, a net-like separator is disposed between the films so that the films are not in direct contact with each other. There is something that has improved.

`` Satellite Thermal Control Handbook '' The Aerospace Corporation, 1994, p.4-82 “Second Edition Aerospace Engineering Handbook” Maruzen Co., Ltd., September 30, 1992, p. 1037

  By the way, the above-mentioned multilayer heat insulating material is cut according to the size and form of the covering portion of the spacecraft, and appropriate portions are tied together by stitching so as to maintain a certain shape. In order to maintain the shape, it is necessary to tighten with a certain amount of force.

  For this reason, in the conventional multilayer heat insulating material, although there is a separator, there is a problem in that the films are substantially in contact with each other at the layered portion between the layers, thereby reducing the heat insulating performance. The problem was to solve the problem.

  The present invention has been made paying attention to the above-described conventional problems, and an object of the present invention is to provide a multilayer heat insulating material capable of improving the heat insulating performance by suppressing the heat conduction of the binding portion between the layers.

  The multilayer heat insulating material of the present invention forms a sheet-like laminated body with a plurality of heat insulating films having a low thermal radiation surface and a heat insulating separator disposed between the heat insulating films, and at any position in the plane of the laminated body On the other hand, the heat insulating member interposed between the layers of the heat insulating film and the fixing means for binding the heat insulating film, the heat insulating separator, and the heat insulating member in the stacking direction are provided. As a means of.

  According to the multilayer heat insulating material of the present invention, it is possible to suppress the heat conduction of the binding portion between the layers and improve the heat insulating performance.

It is sectional drawing (A) before the interlayer binding which demonstrates one Embodiment of the multilayer heat insulating material of this invention, and sectional drawing (B) after interlayer binding. It is a top view (A) which shows an example of a heat insulation member, and a top view (B) which shows the other example of a heat insulation member. It is sectional drawing (A) before interlayer binding explaining other embodiment of the multilayer heat insulating material of this invention, and sectional drawing (B) after interlayer binding.

  FIG. 1 is a view showing an embodiment of the multilayer heat insulating material of the present invention. The illustrated multilayer heat insulating material A1 forms a sheet-like laminate S with a plurality of heat insulating films 1 having a low thermal radiation surface and a heat insulating separator 2 disposed between the heat insulating films 1. In FIG. 1, three heat insulating films 1 and two heat insulating separators 2 are illustrated, but actually, for example, about ten or more heat insulating films 1 and an appropriate number of heat insulating separators 2 are used. There is also.

  The heat insulating film 1 is obtained by depositing a metal on a resin film as a material, and as a material of the resin film, for example, polyimide can be used, and as a metal to be deposited, for example, aluminum or the like is used. Can do. Thereby, the heat insulation film 1 becomes a thing whose surface thermal emissivity is very low. Moreover, the heat insulation separator 2 comprises net shape, As a material, polyester etc. can be used, for example.

  Furthermore, the multilayer heat insulating material A1 has the heat insulating member 3 interposed between the layers of the heat insulating film 1, the heat insulating film 1, the heat insulating separator 2, and the heat insulating member 3 in the stacking direction with respect to an arbitrary position in the plane of the laminate S. Fastening means for binding is provided.

  Here, since the multilayer heat insulating material A1 is used for a spacecraft exterior material or the like, the multilayer heat insulating material A1 is cut according to the size and form of the covering portion of the spacecraft, and the shape thereof can be kept constant. Appropriate locations will be bound. Therefore, the position where the heat insulating member 3 and the fastening means are provided is a position necessary for the multilayer heat insulating material A1 to maintain a desired shape, and is on a plane arbitrarily set according to the size and form of the covering portion. Is the position.

  The heat insulating member 3 is a flat member having a small area that is disposed in a binding portion by the fastening means. Although the shape of the heat insulating member 3 is not limited, as described above, the heat insulating member 3 is provided at a position necessary to maintain the shape of the multilayer heat insulating material A1, and therefore, for example, FIG. As shown in Fig. 2), there are a circular shape that is pinpointed and a belt-like shape that is linearly arranged as shown in Fig. 2 (B). Can do.

  Moreover, in this embodiment, as shown to FIG.1 and FIG.2, the heat insulation member 3 is arrange | positioned on the one side (upper side) of the heat insulation separator 2 between heat insulation films 1, and also the laminated body S of It arrange | positions also on the outer surface of the heat insulation film 1 of the outermost layer used as the front and back both sides with respect to the arbitrary positions in a plane. As the material of the heat insulating member 3, for example, polyimide foam material, glass wool, polyethylene foam material, polystyrene foam material, and the like can be used. Further improvement can be achieved.

  In this embodiment, the fastening means is a thread-like member 4 that stitches the heat insulating film 1, the heat insulating separator 2, and the heat insulating member 3 together. As the material of the thread-like member 4, polyester, glass fiber, meta-aramid fiber (Nomex: registered trademark), or the like can be used, and mechanical strength and heat resistance are ensured by selecting such a material. However, the heat insulation performance can be further improved.

  Then, as shown in FIG. 1A, the multilayer heat insulating material A1 passes the thread member 4 through the heat insulating film 1, the heat insulating separator 2, and the heat insulating member 3 at least once, and then tightens the thread member 4 Thereby, as shown to FIG. 1 (B), the heat insulation film 1, the heat insulation separator 2, and the heat insulation member 3 are bound in the lamination direction. At this time, when the circular heat insulating member 3 is used as shown in FIG. 2 (A), the thread-like member 4 binds (sews) each member at a pinpoint, and forms a belt-like shape as shown in FIG. 2 (B). When the heat insulating member 3 is used, the members are continuously bound (sewn).

  The multilayer heat insulating material A1 having the above configuration exhibits a high heat insulating function by the heat insulating film 1 and the heat insulating separator 2. That is, in the outer space (vacuum space), since heat is transferred by radiation or heat conduction in the member, direct contact between the heat insulating films 1 having a low heat radiation surface and the heat insulating films 1 is prevented. By combining with the heat insulating separator 2, heat conduction can be prevented and a high heat insulating function can be obtained. And the multilayer heat insulating material A1 is maintaining the fixed shape by binding an appropriate location.

  The multilayer heat insulating material A1 includes a heat insulating film 3 interposed between the heat insulating films 1 in the binding portion, and the heat insulating film 1, the heat insulating separator 2, and the heat insulating member 3 are threaded members (fastening means) 4 In this case, the heat insulating films 1 are completely prevented from contacting each other. Thereby, multilayer heat insulating material A1 can suppress the heat conduction of the binding part between layers small, and can implement | achieve the improvement of a heat insulation function as a whole.

  Moreover, the multilayer heat insulating material A1 arrange | positions the heat insulation member 3 also on the outer surface of the heat insulation film 1 of the outermost layer, and in the laminated body S, the heat insulation film 1 on the back side via the thread-like member 4 from the heat insulation film 1 on the front side. It is possible to reduce the heat conduction in the path leading to, thereby contributing to further improvement of the heat insulating function.

  Furthermore, since the multilayer heat insulating material A1 employs the thread-like member 4 as the fastening means, the heat conduction of the fastening means itself can be made smaller, and the heat insulating member 3 on the outer side surface of the outermost layer can be used. Since the thread-like member 4 is adopted, the heat insulating member 3 also functions as a patch, and the strength of the bound portion can be increased.

FIG. 3 is a view showing another embodiment of the multilayer heat insulating material of the present invention. Note that the same components as those of the previous embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In the illustrated multilayer heat insulating material A2, the fastening means includes a bolt 5 that penetrates the heat insulating film 1, the heat insulating separator 2, and the heat insulating member 3, and a nut 6 that is screwed to the bolt 5. Even in the multilayer heat insulating material A2 having such a configuration, the same operations and effects as those of the previous embodiment can be obtained.

  Since the multilayer heat insulating material A2 employs the bolt 5 and the nut 6 as the fastening means, the thermal conductivity of the fastening means itself is increased as compared with the configuration employing the thread-like member as in the previous embodiment. However, further improvement in mechanical strength and durability can be realized. In the case of this embodiment, the heat insulating member 3 on the outer side surface of the outermost layer also functions as a washer, and the strength of the bound portion can be increased.

  In addition, the multilayer heat insulating material of the present invention is not limited to the above-described embodiments, and details of the structure, such as the material, number, and form of each member, are within the scope of the present invention. It can be changed as appropriate.

A1 A2 Multilayer insulation material S Laminate 1 Thermal insulation film 2 Thermal insulation separator 3 Thermal insulation member 4 Thread member (fastening means)
5 bolts (fastening means)
6 Nut (fastening means)

Claims (4)

While forming a sheet-like laminate with a plurality of heat insulating films having a low thermal radiation surface and a heat insulating separator disposed between the heat insulating films,
A multilayer comprising a heat insulating member interposed between layers of the heat insulating film, and a fixing means for binding the heat insulating film, the heat insulating separator, and the heat insulating member in the stacking direction with respect to an arbitrary position in the plane of the laminate. Insulation.   The multilayer heat insulating material according to claim 1, wherein a heat insulating member is disposed also on an outer surface of the heat insulating film of the outermost layer with respect to an arbitrary position in the plane of the laminate.   The multilayer heat insulating material according to claim 1 or 2, wherein the fastening means is a thread-like member that stitches the heat insulating film, the heat insulating separator, and the heat insulating member.   The multilayer heat insulating material according to claim 1 or 2, wherein the fastening means is a bolt that penetrates the heat insulating film, the heat insulating separator, and the heat insulating member, and a nut that is screwed to the bolt.

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