JPS6052944B2 - laminated insulation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminated heat insulating material for reducing heat intrusion into a low-temperature part due to radiation in a vacuum.

A liquid helium container using a laminated insulation material will be explained below.

Conventionally, it was the first liquid helium container using laminated insulation.
I got what is shown in the figure.

In Figure 1, 1 is an outer tank, 2 is a suspended inner tank whose upper part is fixed inside the outer tank 1, 3 is liquid helium stored in the inner tank 2, and 4 is the outer tank 1 and the inner tank. A vacuum section with a space between it and the tank 2, 5 is a sheet made of Mylar (trade name) wrapped around the inner tank 2 and aluminum is deposited on it (hereinafter referred to as aluminum-deposited Mylar), and 6 is a glass made of aluminum-deposited Mylar 5 alternately stacked on top of the other. It is paper. Next, the operation of the above will be explained.

Although vacuum insulation is provided in the vacuum section 4 to prevent evaporation of the liquid helium 3 stored in the inner tank 2 suspended within the outer tank 1, heat intrusion occurs due to radiation. This radiant heat is reflected by aluminum vapor-deposited mylar 5 wrapped around the inner tank 2. However, since heat conductivity is high with aluminum vapor-deposited mylar 5 alone, radiated heat can be reduced by alternately layering glass paper with low heat conductivity between them and wrapping it around the inner tank 2 to reduce mutual contact. I'm letting you do it. Conventional laminated insulation materials are as described above, so when wrapping them, it is necessary to avoid excessive contact between the aluminum-deposited mylar and the glass paper, and it is necessary to always maintain the same processing conditions. However, the drawback was that the insulation effect changed significantly because the construction conditions changed due to different workers.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above. The purpose of the present invention is to provide a laminated insulation material that maintains its insulation effect even when the construction conditions and workers change, by sandwiching a material, that is, a heat insulating material.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, 1 is an outer tank, 2 is an inner tank, 3 is liquid helium, 4 is a vacuum section, 5 is aluminum-deposited mylar, and 6 is glass paper, which are the same as those in the conventional tank described above. In this embodiment, a material with low thermal conductivity, such as styrofoam material, other than the glass vapor, ie, a heat insulating material 7, is inserted as a spacer between each arbitrary laminated layer of the aluminum 11 vapor-deposited mylar 5 and the glass vapor 6. It is something. The operation of the embodiment configured as described above is almost the same as that of the conventional one, but
Since the thermal insulating material 7 is sandwiched between each laminated layer of the aluminum vapor-deposited mylar 5 and the glass vapor 6, the thermal insulating material 7 prevents heat conduction due to contact between the aluminum vapor-deposited mylar 5 and the glass vapor 6.

Although the above-mentioned embodiment describes the insulation of a liquid helium container, the present invention can also be applied to other liquefied gas containers and low-temperature equipment using vacuum insulation, and even in this case, the same effects as in the above-mentioned embodiment can be obtained. It can be played.

Furthermore, in the present invention, a nylon net can be used in place of the glass vapor in the above-described embodiments, and in this case, a material with low thermal conductivity that is different from the glass vapor and the nylon net is used as the heat insulating material. Even in this case, the same effects as in the above embodiment can be achieved. Further, in the present invention, a synthetic resin other than mylar with aluminum vapor-deposited may be used. As explained above, according to the present invention, a material with low thermal conductivity other than these is inserted as a spacer between the laminated layers of aluminum vapor-deposited synthetic resin and glass vapor or nylon net, thereby improving the construction conditions.
A laminated insulation material with a constant insulation effect can be obtained regardless of the operator.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a liquid helium container using a conventional laminated heat insulating material, and FIG. 2 is a longitudinal sectional view of a liquid helium container using a laminated heat insulating material according to an embodiment of the present invention. 1...Outer tank, 2...Inner tank, 3...
Liquid helium, 4... Vacuum section, 5...
Aluminum evaporated mylar, 6... Glass vapor, 7... Heat insulating material, and the same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a laminated heat insulating material in which an aluminum vapor-deposited synthetic resin and glass paper or nylon net are laminated to reduce heat intrusion due to radiation in a vacuum, for each arbitrary lamination of the aluminum vapor-deposited synthetic resin and the glass paper or nylon net. , a laminated insulation material characterized by having a material with low thermal conductivity other than glass paper or nylon net inserted between the layers as a spacer.