JPS5916158B2 - laminated insulation - Google Patents

Description

[Detailed description of the invention] The present invention relates to a laminated heat insulating material for low temperatures.

In low-temperature equipment, there is generally a requirement to minimize heat loss, and in some cases,
Heat loss often determines the performance of the device.

Conventional insulation methods at low temperatures include vacuum powder insulation method, vacuum powder + metal powder insulation method, high vacuum insulation method, high vacuum insulation method with shield, and multilayer vacuum insulation method, but they are difficult to implement, There are drawbacks such as weight issues.

The present invention relates to a laminated insulation material in the multilayer vacuum insulation method. Conventionally, this type of insulation material has been a gold foil with a low emissivity such as aluminum, copper, silver, or gold, or a layered foil made of the above-mentioned metals. A metal-deposited plastic film such as a vacuum-deposited polyester film is used as a radiation shield material, and a spacer material is made of glass fiber cloth, polyester, or nylon, and the radiation shield material and spacer material are alternately laminated. There is.

However, when insulating cryostats for storage tanks of liquid helium, liquid hydrogen, etc., cryostands for superconducting cables, etc. using conventional insulation materials, it is necessary to rely on manual labor because the shape of the inner tank of the cryostand is very complicated. This requires a large number of people and time,
In addition, quality control and insulation performance management are difficult.

Furthermore, when used in a cryostand for a magnetically levitated train, the laminated insulation material collapses during acceleration and deceleration, and there are drawbacks in terms of earthquake resistance.

The present invention eliminates various drawbacks of conventional laminated insulation materials, including (1) improvement in workability during insulation construction;
) Easy insulation construction regardless of the shape of the cryostat, (3) improved quality control, (4) prevention of laminated layers collapsing, (5) improved seismic resistance, and (6) cost reduction through mass production. The purpose of this product is to provide a laminated heat insulating material that can be used as a heat insulating material. Organic material sand with a plurality of laminated fasteners attached to the upper and lower surfaces is integrally sewn so that the fasteners are located on the surface to form a heat insulating unit;
A low-temperature laminated heat insulating material in which a large number of units are bonded to each other by the fasteners; Organic material paper or inorganic material gauze are alternately laminated, and organic material sand having the above-mentioned laminated fasteners is sewn onto this to form a heat insulating unit, and many of the units are interconnected by the fasteners. It is a low-temperature laminated insulation material that is fixed.

Next, the present invention will be specifically explained based on an embodiment shown in FIGS. 1 and 2.

In the figure, 1 is a radiation shield material, which includes aluminum, copper,
This is an organic material film with low emissivity metals such as silver and gold deposited on one side.

This organic material film has low thermal conductivity,
Examples include polyester films that do not become brittle at low temperatures.

2 is a spacer material, and organic material sand such as polyester gauze, which has low thermal conductivity and does not become brittle at low temperatures, or inorganic material gauze is used.

This radiation seal)"#1 and the spacer material are
A laminate 3 is obtained by alternately stacking layers at a stacking density of 20 to 35 layers per L.

Organic material sand 5, for example, polyester gauze, on which cloth fasteners 4 are sewn on both upper and lower surfaces of the laminate 3, is polymerized, and is integrally sewn with polyester sewing thread, nylon sewing thread, or natural sewing thread 6 such as cotton or silk. It is sewn into an insulation unit.

Although the heat insulating material unit shown in Figures 1 and 2 is in the form of a package, it may be in the form of a long strip.

Further, the organic material sand 5 sewn integrally with the laminate 3 is made of nylon gauze or the like, and its shape is not limited to sheet-like as shown in FIGS. 1 and 2.
Alternatively, the laminate 3 may be wrapped in a bag shape.

In addition, when considering the weight reduction of laminated insulation materials, it is recommended to use a film made of an organic material vacuum-deposited with a low emissivity metal as a radiation shielding material with irregularities to reduce contact between the shielding materials. Alternatively, the spacer material may not be used.

Next, FIG. 3 shows an example of a laminated heat insulating material formed using the packaged heat insulating material unit according to the present invention.

In the figure, reference numeral 7 indicates the inner tank or cooling shield plate of the cryostat, to which the first stage insulation unit 9 is fixed to a cloth fastener 8 bonded with a low-temperature adhesive or the like. ing.

The second stage insulation material unit 9 is shifted by half the length of the first stage insulation material unit, and the fastener 4 is attached to the second stage insulation material unit 9.
, 4' and stacked in blocks.

In addition, when performing insulation by stacking insulation material units in a block shape in this way, in order to prevent radiant heat from leaking between the laminated insulation material units, the sides of each insulation material unit must be stacked as shown in Figure 4. Forming it diagonally is effective.

The laminated heat insulating material of the present invention has the following effects.

(1) Laminate collapse within the laminated insulation material unit is completely eliminated by sewing, and the shape can be changed arbitrarily.

(2) Each unit of the laminated insulation material is attached with a fastener, so each unit is fixed to each other by the fastener, so it can be easily fixed regardless of the shape of the cryostat, making it possible to perform insulation construction with good workability. .

(3) The shapes of the shield material and spacer material can be changed and cut as appropriate, and the shape of the unit can be made into any shape.

(4) In the process of manufacturing a unit of laminated insulation material, sufficient quality control can be easily achieved by controlling the number of laminated layers per unit length, the sewing pitch, etc.

(5) Mass production becomes possible and costs are reduced.

(6) Repairs can be made easily.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a laminated insulation material unit showing one embodiment of the present invention, FIG. 2 is a sectional view of the unit shown in FIG. 1,
FIG. 3 is a sectional view showing a laminated heat insulating material formed by laminating a large number of heat insulating material units of the present invention, and FIG. 4 is a sectional view showing another embodiment of the heat insulating material unit of the present invention. 1...Radiation shield material, 2...Spacer material, 3...Laminated body, 4,4'-...
Laminated zipper, 5... Organic material sand,
6...Sewing thread, 9...Insulation unit.

Claims (1)

[Scope of Claims] 1. A gauze made of an organic material in which a plurality of laminated fasteners are attached to the upper and lower surfaces of a laminate formed by laminating films made of an organic material with a low thermal conductivity on which a gold layer with a low emissivity is vapor-deposited. 1. A laminated heat insulating material for low temperature use, characterized in that the laminated heat insulating material for low temperatures is formed by integrally sewing a heat insulating material unit such that the is located on the surface thereof to form a heat insulating material unit, and a large number of the units are fixed to each other by the above-mentioned laminated fastener. 2 A fastener laminated on the upper and lower surfaces of a laminate made by alternately laminating a film made of an organic material with low thermal conductivity on which a metal with low emissivity is vapor-deposited, and paper made of an organic material with low thermal conductivity or sand made with an inorganic material. A laminated insulation material for low temperature use, characterized in that a plurality of organic material gauze to which a plurality of organic material gauze are attached are sewn integrally so that the fasteners are located on the surface, and a large number of insulation material units are fixed to each other by the laminated fasteners. .