JPH0563298B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a flat vacuum heat insulating material.

[Background of the invention]

Vacuum heat insulating materials with a high heat insulating function were only available in cylindrical or spherical structures due to the pressure-resistant structure of the outer container, but recently, flat or box-like structures with built-in spacers have been considered.

This spacer is made by laminating ultra-thin diameter inorganic fibers in a direction perpendicular to the heat transfer direction, and has a heat insulating function due to multi-stage contact thermal resistance.
As it is, the density is low and the compressive deformation due to vacuum pressure is large, and the entire panel is deformed greatly, making it difficult to assemble. Measures have been taken to increase density and reduce compressive deformation by sewing through the material.

However, with this method, since the frictional resistance of the sewing system is low, it is necessary to pass many sewing systems in the heat transfer direction.
For this reason, there was a defect that the insulation function was reduced due to heat conduction loss in this sewing system.

[Purpose of the invention]

The present invention has been made to improve the above defects.

[Summary of the invention]

That is, the main direction of small-diameter inorganic fibers is randomly laminated in the direction perpendicular to the heat transfer direction, and the inorganic material is sewn into this to form a high-density fiber mat, which is installed inside a flat panel. , a vacuum insulation material characterized by its interior being sealed in a high vacuum.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 1 to 5. 1 is made of stainless steel,
1a is a flange thereof; 1b is a cylindrical collar provided on the pressed bottom of the drawn outer plate 1; 2 is an outer plate serving as a lid for the drawn outer plate 1; 3 is a vacuum It is a pipe, one end of which is welded to the collar 1b. 4 is fiber mat, this thin inorganic material has a heat resistance of several hundred degrees or more.
It can prevent gas generation.

4a is a small diameter fiber of the fiber mat 4, and this small diameter fiber 4a is randomly laminated with the main direction perpendicular to the heat transfer direction, and is in point contact with each other, which forms multiple stages in the heat transfer direction. Configure it like this.
4b is an inorganic fiber mat made by combining other small fibers in order to have small diameter fibers 4a withstand pressure and reduce deformation under pressure, and by sewing these together, a high-density fiber mat 4 is made. .

In order to construct a vacuum insulation material with the hanging parts, first, a fiber mat 4 is installed inside the concave part of the aperture outer plate 1,
Cover with the outer plate 2, hermetically weld the flange 1a and the outer periphery of the outer plate 2, connect a vacuum pump (not shown) to the vacuum pipe 3, and heat to a high temperature while exhausting to remove gas. After baking and degassing, a part of the vacuum pipe 3 is sealed and cut to complete the vacuum insulation material.

[Effects of the Invention] In the vacuum heat insulating material constructed as described above, the main direction of the small diameter fibers 4a of the fiber mats 4 serving as spacers is perpendicular to the heat transfer direction and they are laminated randomly, so that heat conduction is improved. has a large contact thermal resistance due to multi-stage point contact, has a high heat insulating function, and the inorganic material 4b sewn to make it high density has high strength.
Since the pressing force applied to the small-diameter fibers 4a is high, the fiber mat 4 with sufficiently high pressure resistance can be constructed with a small number of stitches, which has the effect of dramatically reducing heat conduction loss. In addition, convective heat transfer loss can be prevented by the vacuum, and heat loss around the outer panels due to the drawn outer panels 1 and 2 can be prevented by the stainless steel material, which has low heat conduction, providing a high insulation function overall. It is something to do.

Furthermore, since the fiber mat 4 has a high density, it is less compressively deformed by vacuum pressure, and has the effect of facilitating assembly and installation.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a vacuum insulation material, FIG. 2 is a vertical sectional view of FIG. 1, FIG. 3 is a perspective view of a fiber mat, and FIG. 4 is a diagram of random lamination of small diameter fibers.
FIG. 5 is an enlarged side view of the fiber mat. 1... Squeezed outer plate, 1a... Flange, 1b... Collar, 2... Outer plate, 3... Vacuum pipe, 4... Fiber mat, 4a... Fine diameter fiber, 4b... Inorganic system.

Claims (1)

[Claims] 1 The main direction of the inorganic small diameter fibers 4a is randomly laminated in the direction perpendicular to the heat transfer direction, and the inorganic fibers 4b are sewn into this to form a high-density fiber mat 4.
A vacuum insulation material characterized by comprising a flat panel, and having the interior sealed as a vacuum.