JPS58104081A - Heat insulator and manufacture - 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 The present invention relates to a method for manufacturing a heat insulating body for use in refrigerators, etc., and an object of the present invention is to maintain high heat insulating properties equivalent to those at the initial stage even after aging.

As shown in FIG. 2, a conventional heat insulator 1 is a sealed container 2 made of a plastic film filled with aggregate 3 such as silica powder or perlite, and the inside of the container is evacuated. However, the plastic film container 2
is made of vinylidene chloride nylon, mainly N2,02
There was a drawback that the degree of vacuum inside the vacuum-filled aggregate 3 gradually decreased over time.

In addition, a plastic sheet with a thickness of 10 mm or more is required to completely eliminate air permeation through the plastic film container 2, and as a result, the space inside the container 2 is reduced, and the area where the aggregate 3 is placed is less dense and a heat insulator is required. It had the disadvantage that the heat insulation properties of No. 1 were inhibited. Furthermore, it took a long time to bring the inside of the container filled with aggregate 3 to a high vacuum, making production difficult as a whole.

In the present invention, the air passing through the plastic film container is mixed with an adsorbent such as molecular sieves that selectively adsorbs the air to the aggregate inside the container, thereby keeping the vacuum inside the container constant over a long period of time. In addition, the above-mentioned drawbacks of the conventional methods are solved by impregnating the adsorbent with a fluorocarbon-based refrigerant and evacuating the inside of the container before mixing it with the aggregate.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 4 is a sealed container made of plastic film such as vinylidene chloride or nylon. 5 is a porous aggregate such as perlite or activated carbon provided in the plastic film container 4, and 6 is Molequilla, which is an air-selective adsorbent such as synthetic zeolite or activated carbon mixed in the porous aggregate 6. It is an adsorbent made of sieves.

7 is an aggregate 6 filled in a plastic film container 4
This is the heat insulator 7 in which the adsorbent 6 is evacuated to 10=-10-' Tarx.

In the above configuration, the adsorbent 6 is impregnated with a fluorocarbon refrigerant such as difluoromethane or dichlorofluoromethane in advance, and a predetermined amount of this is mixed with the porous aggregate 6, and then the container 4 is filled. , inside the container 4 from 10 to 1
A heat insulator 7 is formed by evacuation to 0 Torr.

Therefore, air entering from the sealed container 4 made of a plastic film with a certain air permeability is
Adsorbed by the adsorbent 6, the initial 10-2 to 10-'T
A vacuum degree of orr is maintained. In addition, the blending amount of the adsorbent 6 with respect to the porous aggregate is as follows:
can be changed according to the air permeability of the heat insulator 7, and the heat insulation retention rate of the heat insulating body 7 can be freely selected. In addition, since the adsorbent 6 is impregnated with a fluorocarbon-based refrigerant in advance, the porous aggregate 6 is used when the inside of the container is evacuated to a high vacuum.
It is possible to easily and quickly purge air, impurities, etc. that have been adsorbed in the vacuum chamber, thereby achieving the effect of reaching a predetermined degree of vacuum more quickly.

As is clear from the above description, the heat insulator of the present invention adsorbs air that permeates from the outside of a sealed container such as a plastic film inside the container, so that the initial degree of vacuum is maintained. Deterioration of insulation properties can be prevented. Furthermore, since a plastic film can be used for the heat insulating container, the heat insulating properties of the structure are equal to those inside the container, and the heat insulating properties are not impaired. Furthermore, when vacuuming the inside of the container, since the adsorbent is impregnated with a fluorocarbon-based refrigerant, air and impurities adsorbed on the aggregate can be purged easily and quickly, reducing vacuuming time and improving work efficiency. It is possible to obtain effects that can be measured as improvements.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the heat insulating body of the present invention;
The figure is a cross-sectional view of a conventional heat insulator. 4... Container, 5... Porous aggregate, 6.
...Adsorbent, 7...O, heat insulator. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (2)

[Claims] (1) A mixture of porous aggregate such as perlite, an adsorbent such as Molecuila Sheep that adsorbs air, and a plastic that is filled with this mixture and is evacuated inside. A heat insulator consisting of a container such as film. (2) Made of porous aggregate such as perlite, an adsorbent such as molecular sieves that adsorbs air, and a heat insulating material such as a plastic film with low air permeability that wraps the porous aggregate and adsorbent. The adsorbent was pre-impregnated with a fluorocarbon-based refrigerant such as monochlorofluoromethane or dichlorofluoromethane and mixed with the porous aggregate, and then this mixture was filled into the container and evacuated. Method of manufacturing insulation.