JPH0893988A - Metal heat insulating device - Google Patents

Abstract

PURPOSE: To prevent heat insulating sheet materials consisting of metal foils filled and arranged in a metal box body from making contact to each other even when they are distorted at a high temperature. CONSTITUTION: Heat insulating sheet materials 1 consisting of a required number of metal foils are adhered in a laminated form by a heat resisting adhesive 2 applied in parallel lines in positions successively shifted by a half pitch, and then extended in the laminated direction to form a honeycomb laminated body B. This honeycomb laminated body B is filled and arranged in a metal box body A in a direction in which a radiation heat flows through the heat insulating sheet material surfaces. Thus, since the heat insulating sheet materials of the metal foils are held in the honeycomb structure by the linearly applied adhesive, the heat insulating sheets never make contact to each other even when the heat insulating sheets are distorted at a high temperature. The honeycomb space forming an air layer is also kept as it is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a metal heat insulation device suitable for use mainly in equipment, containers, pipes and the like of a nuclear power plant.

[0002]

2. Description of the Related Art Conventionally, as this type of metal heat insulation device, a stainless steel box body is heat-insulated by a metal foil such as an aluminum foil or a stainless steel foil which is embossed (concavo-convex or wrinkled). 2. Description of the Related Art A jacket type heat insulating structure is known in which a large number of sheet materials are filled in a laminated state.

[0003]

In the metal heat insulating device having the above-mentioned structure, the heat radiation of the heat-insulated body is prevented by the effect of reflecting the radiation conduction heat by the heat insulating sheet material such as aluminum foil and the heat insulating effect of the air layer between the sheet materials. It also functions as a heat insulating material. However, when the aluminum foil is heated at a high temperature of 300 ° C. or higher, distortion occurs, the number of contact portions (contacts such as points, lines, and surfaces) between the laminated sheet materials increases, and the thermal conductivity (λ) Has the drawback of becoming large. In addition, if the heat-insulating sheet material with the metal foil embossed is put into the box and pressed, the above-mentioned contact parts between the sheet materials will increase, and it will be used in a state where the thermal conductivity is increased from the beginning. There is also a drawback that

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and even if the heat insulating sheet material such as aluminum foil is distorted at high temperature, the contact portion between the heat insulating sheets does not increase, The main purpose of the invention is to provide a metal heat insulating device that can keep the space as it is.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a metal heat insulating apparatus in which a heat insulating sheet material made of a metal foil is filled and arranged in a metal box body in a laminated form, and a laminate of the heat insulating sheet material made of the metal foil is The required number of heat-insulating sheet materials are laminated in a laminated shape with a heat-resistant adhesive that is applied in parallel to the parts that are sequentially displaced by a half pitch, and then expanded in the stacking direction to form a honeycomb shape. Then, the gist is that the radiant heat is packed and arranged in the box body in a direction in which the radiant heat flows through the surface of the heat insulating sheet.

[0006]

In the structure of the metal heat insulation device described above, since the heat insulation sheet material made of the metal foil is held in the honeycomb structure by the adhesive, even if the heat insulation sheet material made of the metal foil is distorted at high temperature, the heat insulation sheet material is formed. The materials do not come into contact with each other, and the honeycomb space serving as an air layer is maintained as it is.

[0007]

FIG. 1 shows an embodiment of the present invention. In FIG. 1, A is a metal box body made of stainless steel, B is a honeycomb-shaped metal laminate filled and arranged in the metal box body.
Is a heat insulating sheet material made of aluminum foil, and 2 is an adhesive that linearly adheres the laminated heat insulating sheet materials. The honeycomb-shaped metal laminate B is obtained, for example, by the manufacturing method shown in FIGS.

First, as shown in FIG. 2, the cylindrical adhesive applying member D is applied to the aluminum foil 1 drawn out from the aluminum foil winding roll C by the cylindrical adhesive applying member D at a predetermined pitch interval along the drawing direction of the aluminum foil so as to be heat resistant. After the adhesive 2 is applied in parallel lines, it is cut into a predetermined length to obtain the adhesive-attached aluminum foil 1.

Next, as shown in FIG. 3, the required number of adhesive-bonded aluminum foils 1 obtained in the above step are overlapped with each other at positions where the intervals of the adhesives 2 are shifted by a half pitch, and the aluminum foils are bonded to each other. To make a laminated body. The honeycomb-shaped laminated body B shown in FIG. 4 is obtained by expanding the laminated body in parallel in the laminating direction by an appropriate means. In this case, as a result of the method of spreading the laminate, as shown in FIG. 5, a honeycomb-shaped laminate B ′ whose whole is curved in an arc shape can be obtained.

The heat resistant adhesive 2 preferably has a heat resistance of 300 ° C. or higher. For example, high heat resistant silicon or colloidal silica to which silica fine powder is added as a filler, or aluminum phosphate to silicic acid as a filler. Examples include those to which magnesium or magnesium hydroxide is added.

As shown in FIG. 1, the honeycomb-shaped laminate B made of the aluminum foil of FIG. 4 constructed as described above has its aluminum foil surface facing the heat penetration direction (arrow direction) of the cubic box A. Place it in the direction you want it filled. The honeycomb laminated body B ′ shown in FIG. 5 is suitable for filling and arranging in a tubular segmented metal box body for heat insulation of piping.

Further, when the metal box body filled with the honeycomb-shaped laminates B and B'is placed vertically, heat conduction due to convection in the honeycomb space serving as an air layer becomes large,
Convection can be prevented by dividing the honeycomb-shaped laminate (250 to 300 mm) and inserting a spacer made of a mica sheet, an aluminum sheet, or the like in between.

[0013]

As described above in detail, according to the constitution of the metal heat insulating material of the present invention, the following effects can be obtained. (1) Since the heat insulating sheet materials made of the metal foil are held in the honeycomb structure by the adhesive applied linearly, even if the metal heat insulating sheet materials are distorted at high temperature, the heat insulating sheet materials may contact each other. There is no. In addition, the honeycomb space serving as an air layer is also maintained as it is. (2) The thermal conductivity can be adjusted by freely selecting the metal foil interval. (3) It is possible to reduce the thermal conductivity by 10 to 20% when the same number of metal foils is used as compared with the conventional embossed metal foil. (4) Since the application of the adhesive can be automated and the production can be performed by simple steps such as cutting and spreading, the productivity can be improved.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view of a metal heat insulating device showing an embodiment of the present invention.

FIG. 2 is a process diagram of applying an adhesive to a metal foil.

FIG. 3 is a side view of a metal foil laminate bonded with an adhesive.

FIG. 4 is a side view of a honeycomb-shaped laminated body formed by spreading a metal foil laminated body.

FIG. 5 is a side view of a honeycomb-shaped laminate in which the metal foil laminate is curved in an arc shape.

[Explanation of symbols]

 A metal box B, B'honeycomb laminated body 1 metal foil 2 heat-resistant adhesive C aluminum foil winding roll D cylindrical adhesive application member

Claims (1)

[Claims] 1. A metal heat insulating apparatus comprising a heat insulating sheet material made of metal foil, which is packed and arranged in a laminated manner in a metal box body,
The laminated body of the heat insulating sheet material made of the metal foil has a required number of heat insulating sheet materials, which are sequentially laminated in parallel with each other by a heat-resistant adhesive applied in parallel lines at positions displaced by a half pitch, and then laminated in the laminating direction. A metal heat insulating device, which is formed in a honeycomb shape by being spread into a box, and is packed and arranged in the box body in a direction in which radiant heat flows through the surface of the heat insulating sheet material.