JPH1156649A - External wall holding material in vacuum part in flat metallic vacuum heat insulating structure and usage thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make holding materials stand outside air pressure and reduce heat conduction by forming the holding materials into metallic thin plate pipe shapes and arranging the holding materials so that outside air pressure applied to an external wall may be almost balanced at the inside and outside of the circumference of a pipe. SOLUTION: Holding materials 4 of a metallic thin plate pipe shape are charged between a left external wall 1 and a right external wall 2 forming a vacuum part 3 of a flat metallic vacuum heat insulating structure. A plate thickness of the holding material 4 is determined for 0.2 mm to 1 mm, for instance, an outside diameter of the holding member 4 is determined according to the size of the flat metallic vacuum heat insulating structure and the arrangement interval of the holding materials 4 is determined so that pressure applied to the inside and outside of the circumference of the pipe-shaped holding materials 4 may be almost balanced according to the outside diameters of the holding materials 4. Thus, deformation of the left external wall 1 and the right external wall 2 is reduced and the vacuum part 3 can be maintained. The external wall can be thinned, heat conduction can be reduced, the holding materials 4 are made to stand outside air pressure, the plate thickness of the holding materials 4 is thinned, heat conduction is reduced, and resources saving and energy saving of vacuum heat insulation can be more effectively obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding member whose outer wall forming a vacuum portion can withstand an outside air pressure in a flat metal vacuum heat insulating structure, and a method of using the holding member.

2. Description of the Related Art Conventionally, a holding material (diameter 7 mm, thickness 4 mm) mainly composed of rock wool or the like is inserted between the outer walls of a vacuum section of a glass thermos or the like by vacuum insulation and the outer wall is exposed to an atmospheric pressure. It is held to withstand.

[0003] Circular objects such as thermos bottles may be strong against the outside air pressure and small in the outer wall holding force. It is effective that the outer wall of the metal vacuum insulation structure has a small thickness of 0.2 mm to 0.7 mm in the case of stainless steel in order to reduce heat conduction. The vacuum maintained by the outer walls is between 2 mm and 10 mm.
When the metal vacuum insulation structure of such a shape has a flat shape, it is difficult to withstand the outside air pressure, and the outer wall is pressed against the vacuum part side and deforms to form a vacuum part. Will not play.

[0004] For this reason, a material for holding both outer walls forming the vacuum portion is required. The holding material must withstand the external pressure received by the outer wall and have low heat conduction. For this reason, the holding material of the outer wall has been a problem in the flat metal vacuum heat insulating structure.

[Problems to be Solved by the Invention] In a flat metal vacuum heat insulating structure, it is necessary to make the wall thickness as thin as possible in order to reduce the heat conduction of the outer wall forming the vacuum portion. It is appropriate that a vacuum portion having a vacuum heat insulating effect, that is, a distance between both outer walls is 2 mm to 10 mm.

[0006] In this structure, when the vacuum portion is evacuated, the outer wall is pressed to the outside air pressure and deforms to the vacuum side, so that both outer walls come into contact with each other so that the vacuum insulation cannot be used. In order to prevent this, a holding material for holding the outer wall in the vacuum section is required.

[0007] The holding material is required to withstand the external pressure applied to the outer wall and to have low heat conduction. By holding the holding material in the form of a thin metal pipe, arranging the pipe as shown in Fig. 1 and arranging the outer pressure applied to the outer wall so that it is closer to equilibrium inside and outside the circumference of the pipe, It is intended to withstand and reduce heat conduction.

[Means for Solving the Problems] Vacuum heat insulation saves resources because no heat insulating material is required, and saves energy because it has the best heat insulation performance.

The outer wall forming the vacuum section as a resource-saving element in the metal vacuum heat insulating structure, the left outer wall (1) and the right outer wall (2) shown in FIG.
The thickness may be reduced from 2 mm to 0.7 mm. Further, the space between the vacuum section (3) and the left outer wall (1) and the right outer wall (2), which provide the heat insulating effect, has a heat insulating effect of 2 mm to 10 mm, and the volume required for heat insulating (the thickness of the layer of the heat insulating section) is small. It is a feature of vacuum insulation.

[0010] However, when the outer wall of the flat vacuum heat insulating structure made of metal is thin, it is weak to the outside air pressure and is deformed by being pressed against the vacuum side. Since the distance between the outer walls is 2 mm to 10 mm, the outer walls are easily in contact with each other.

Therefore, in order to effectively insulate the flat vacuum heat insulating structure made of metal, a holding material for holding both outer walls forming the vacuum portion is indispensable. But,
The holding material must be kept to a minimum to conduct heat.

What is required of the holding material is that the holding material withstands the compressive pressure due to the external air pressure applied to the outer wall, has a small cross-sectional area, and has little heat conduction.

According to the present invention, in a flat metal vacuum heat insulating structure, the holding force of the outer wall forming the vacuum portion is made of a thin metal pipe, so that the compression resistance is large.
In addition, heat conduction is reduced.

When the holding members on both outer walls forming the vacuum portion are inserted as shown in FIG. 1, the holding members are arranged so that the pressure applied to the inside and outside of the circumference of the pipe-shaped holding member is close to equilibrium. The purpose of the present invention is to reduce the amount of the holding material to increase the holding power, to reduce the heat conduction, and to enhance the resource saving and energy saving effects.

Embodiments of the Invention Embodiments of the present invention will be described with reference to the drawings based on embodiments. In FIG. 2 showing a cross section of a vacuum-insulated metal structure having a flat shape,
A thin metal pipe-shaped holding member (4) is inserted between the left outer wall (1) and the right outer wall (2) forming the vacuum section (3). The thickness of the holding material is set to 0.2 mm to 1 mm. The outer diameter of the holding material is determined according to the size of the flat metal vacuum heat insulating structure, and the spacing between the holding materials is determined based on the outer diameter of the holding material inside and outside the circumference of the pipe-shaped holding material. Decide so that the pressure is close to equilibrium.

[0016] When the size of the flat metal vacuum heat insulating structure is a quadrilateral having a size of 30 cm to 50 cm, the outer diameter of the holding material is set to 35 mm to 80 mm, and the arrangement interval of the holding material is set to 70 mm to 100 mm. The holding material is arranged so that the pressure applied to the inside and outside of the circumference of the holding material is close to equilibrium.

As a result, the left outer wall (1) and the right outer wall (2) are less deformed and the vacuum portion can be maintained.

The outer diameter of the metal thin pipe-shaped holding material is 5
When it is larger than 0 mm, the shape shown in FIG. 3 can be used to increase the compression resistance.

As the material of the metal vacuum heat insulating structure and the holding material, stainless steel which is excellent in airtightness and has little occlusion and discharge of gas is used, and a getter (5) for adsorbing residual gas and generated gas is used in the vacuum portion. ) Is enclosed.

[Effects of the Invention] The present invention has the following effects.

In a flat metal vacuum heat insulating structure, the heat loss from the left outer wall (1) to the right outer wall (2) is the largest. In order to reduce heat loss, it is necessary to reduce the thickness of the outer wall. If the thickness of the outer wall is reduced, the outer wall cannot withstand external air pressure, and a holding material for the outer wall is required.

Since the holding material also conducts heat, the cross-sectional area of the holding material must be reduced and the number of the holding materials must be reduced.

By making the holding member a metal pipe shape and arranging its arrangement, the outer wall is made thinner, the heat conduction is reduced, the outer pressure is endured, the thickness of the holding member is reduced, and the heat conduction is reduced. It withstands the outside air pressure, and makes the resource and energy saving of vacuum insulation more effective.

[Brief description of the drawings]

FIG. 1 is a plan view of a vacuum-insulated metal structure having a flat shape and a layout diagram of holding members.

FIG. 2 is a cross-sectional view of a flat metal vacuum heat insulating structure and a holding material.

FIG. 3 is a plan view of a holding member having a large outer diameter (an outer diameter exceeding 50 mm).

FIG. 4 is a side view of a holding member having a large outer diameter (an outer diameter exceeding 50 mm).

[Explanation of symbols]

 1 left outer wall 2 right outer wall 3 vacuum section 4 holding material 5 getter

Claims (2)

[Claims] 1. In a flat metal vacuum heat insulating structure, a metal thin pipe-shaped holding member is used as a material for holding an outer wall forming a vacuum portion so that the outer wall can withstand an external atmospheric pressure. Increase the holding force and reduce the heat conduction by the holding material. 2. A flat metal vacuum heat insulating structure, in which a thin metal pipe-shaped holding member is inserted between both outer walls forming a vacuum portion, inside and outside the circumference of the pipe-shaped holding member. By arranging the holding material so that the outside air pressure of the outer wall becomes closer to equilibrium, the outer wall is effectively held with a small amount of holding material.