JPS60208226A - Vacuum heat-insulating material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 invention]

~1 Vacuum heat exchange materials with high heat-like ability have been limited to cylindrical or spherical structures due to their pressure-resistant structure, but recently, flat or box-like structures with built-in spacers have been considered.

This spacer is made by stacking ultra-thin-diameter pure inorganic fibers in a direction perpendicular to the heat transfer direction, and is it possible to improve insulation performance by multi-stage contact thermal resistance? Because the compressive deformation due to thick compression deforms (the whole panel deforms greatly and it becomes difficult to assemble it), some of the fibers are sewn through the fibers in a direction perpendicular to the lamination direction, that is, in the heat transfer direction, using a needle with a hook. Measures have been taken to increase density and reduce compressive deformation.

However, this method has a drawback in that since some of the fibers coincide with the heat transfer direction, heat is transferred directly to the outer panel of the vacuum container due to heat conduction of the sewn fibers, resulting in reheating (lowering of heating performance).

[Purpose of the invention]

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

[Summary of the invention]

In other words, the main direction of the inorganic fine-diameter fibers is randomly perpendicular to the direction of heat transfer, and the sewn fibers are sewn halfway in the direction perpendicular to this to create a high-density fiber mat. This is a vacuum heat exchanger that is installed inside the panel and is sealed as a high vacuum inside.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 1 to 5. 1 is a drawn outer plate made of stainless steel and pressed shallowly; 1a is a flange 1b of the drawn outer plate 1; A cylindrical collar is provided at the bottom of the press 1, 2 is an outer plate serving as a lid for the aperture outer plate 1, and 3 is a vacuum pipe, one end of which is welded to the collar 1b. 4 is a high-density fiber mat made of small-diameter inorganic fibers such as ceramic, and the inorganic fibers have heat resistance of several hundred degrees or more and can prevent gas generation.

4a are small diameter fibers randomly laminated with the main direction of the fiber mat 4 being perpendicular to the heat transfer direction, and the small diameter fibers 4a are in point contact with each other and are configured in multiple stages in the heat transfer direction. do. 4b is a sewing fiber that is sewn perpendicularly to the small diameter fiber 4a, and this sewing is performed from both sides, and the sewing position is finished halfway in the thickness direction of the fiber mat. .

In order to construct a vacuum heat affixing material with hanging parts, first draw the outer panel 1.
A fiber mat 4 is installed inside the concave part, a bush is covered with the outer plate 2, the flange 1a and the outer periphery of the outer plate 2 are hermetically welded, a vacuum pump (not shown) is connected to the vacuum pipe 3, The product is heated to a high temperature while being evacuated to promote removal of scum, and after the completion of baking and removal of scum, a part of the vacuum pipe 3 is sealed off to complete the vacuum insulation material.

〔Effect of the invention〕

In the vacuum heat-insulated shrine constructed as described above, the thin diameter wires i4a of the fiber mats 4 serving as spacers are laminated at right angles to the heat transfer direction and at random, so that heat conduction is achieved by a multi-stage point contact ladder. Touch! ,! i JJ-+: The resistance is 41 and the insulation function is high, and in order to make this high density, the sewn fibers 4b, which are in the heat transfer direction, are sewn in halfway, so the drawn outer plate 1
There is no direct heat conduction between the outer panel 2 and the sewn-in fibers 4b (this has the effect of minimizing heat loss due to the sewn fibers 4b. Moreover, convective loss is reduced by the vacuum, and radiation loss is reduced by the small diameter reflector in multiple stages). The fibers 4a prevent heat loss from going around the outer panels 1 and 2 to the stainless steel material, which has low thermal conductivity, and exhibits high heat insulation viscosity as a whole. be.

Further, since the fiber mat 4 has a high density, it is less compressed and deformed by vacuum pressure, which has the effect of making assembly and arrangement easier.

[Brief explanation of drawings]

Fig. 1 is a perspective IQI of the vacuum insulation material, Fig. 2 is a vertical cross-sectional view of Fig. 1, Fig. 3 is a perspective view of the fiber mat, Fig. 4 is a random coffin layer diagram of small diameter fibers, FIG. 5 is an enlarged side view of the fiber mat. 1... Drawing outer plate, 1a... Flange, 1b... Collar, 2... Outer plate, 3 - Vacuum drawing pipe, 4...
Fiber mat, 4a...Small diameter fiber, 4b...Piled fiber. Figure l Figure 2

Claims (1)

[Claims] 1. Inorganic small diameter fibers (4a) are randomly laminated in a direction perpendicular to the heat transfer direction, and sewn fibers (4a) are laminated in a direction perpendicular to this.
The fiber mat (4) with b) sewn in halfway to make it highly dense was installed inside a flat panel, and the inside was sealed under high vacuum. 2. The vacuum insulation material according to claim 1, characterized in that the sewn-in fibers (4b) are sewn from both sides of the fiber mat (4).