JPH0419465B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a composite heat insulating panel used in refrigerators and the like.

Structure of a conventional example and its problems FIGS. 1 and 2 show a conventional composite heat insulation panel. The configuration of this conventional example will be explained below with reference to FIGS. 1 and 2.

In the figure, 1 is a composite insulation panel, which is a flat box 2 with an open top made of a thin plate such as an iron plate, and the inside is evacuated to a vacuum, and the thermal conductivity of plastic or metal is 0.1 kcal/mhr℃ or more. It consists of a vacuum insulation material 4 with a thermal conductivity of 0.0060 kcal/mhr°C or less wrapped in a laminated film bag 3, and a foamed insulation material 5 such as hard urethane foam with a thermal conductivity of about 0.0150 kcal/mhr°C.

The composite insulation panel 1 is made by pouring the undiluted solution 5' of the foam insulation material 5 into a horizontally placed flat box 2 (the state shown in Fig. 2A), and immediately pouring the vacuum insulation material 4 into the undiluted solution 5'. When placed on top (state shown in FIG. 2B), the stock solution 5' foams over time, fills the void inside the flat box 2, and hardens (state shown in FIG. 2C).

However, in the above conventional example, as the stock solution 5' of the foamed insulation material 5 ages and is filled, approximately 100%
In order to generate a foaming pressure of ~200 g/cm ² , the vacuum insulation material 4 is under pressure, and even though it is initially placed horizontally directly above the stock solution 5', it moves and moves toward the corner of the box 2. It has also happened that one end of the reduced pressure insulation material 4 is in contact with the box 2 and the other end is exposed on the surface of the foam insulation material 5. In other words, in the former case, compared to the insulation performance in the -' direction in FIG. 1, there is a drawback that there are good and bad places depending on the position and orientation of the reduced pressure heat insulating material 4, resulting in non-uniformity. In addition, the latter has the disadvantage that since the reduced pressure insulation material 4 is positioned as a bridge between the top and bottom of the box 2, a vertical heat flow occurs through the bag 3, which has a relatively high thermal conductivity, and the insulation performance of the composite insulation panel 1 deteriorates. It was hot.

Purpose of the Invention The present invention eliminates the drawbacks of the conventional example described above, and prevents the vacuum insulation material placed in the box from shifting due to the foaming pressure of the foam insulation material, thereby improving the insulation performance of the composite insulation panel. The purpose is to prevent it from becoming uniform or decreasing.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a U-shaped box by bending the upper end of one set of side surfaces of the two sets of opposing side surfaces of a box with an open top surface into the inside of the flat box. In this U-shaped groove, the inside is depressurized and the air is degassed, and the outside is wrapped with a laminated film bag made of plastic or metal, etc., and a vacuum insulation material is placed at both ends of the material. is pasted and inserted and fixed.

DESCRIPTION OF THE EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to FIGS. 3 to 5, but the same reference numerals will be given to the same mechanisms as in the prior art, and detailed explanation thereof will be omitted.

In the figure, 1' is a composite heat insulating panel according to the present invention, and 6 is a composite insulation panel made by bending the upper surface of one set of side surfaces of a flat box 2 to the inside of the flat box 2. This is an octopus-shaped groove. Reference numeral 7 denotes an elastic body such as soft urethane foam, which is attached to both ends of one set of the vacuum heat insulating material 4. Both ends of the vacuum insulation material 4 to which the elastic body 7 is attached are inserted into the U-shaped groove 6 of the flat box 2, and the elastic body 7 uses its elastic force to hold both ends of the vacuum insulation material 4. A foam insulation material 5 is provided in the gap between the flat box 2 and the vacuum insulation material 4, which are closely fixed in the U-shaped groove.
is filled.

Next, the manufacturing method of this composite heat insulating panel 1 will be explained using FIG. 5. The undiluted solution 5' of the foam insulation material 5 is poured into the flat box 2 having the U-shaped groove 6 placed horizontally (the state shown in Fig. 5A), and the elastic bodies 7 are pasted on both ends. Insert both ends of the reduced-pressure heat insulating material into the U-shaped groove 6 (state shown in FIG. (Situation C in Figure 5).
At this time, the air in the gap flows between the box 2 and the vacuum insulation material 4.
It escapes to the outside through the gaps and the elastic body 7.

In this embodiment, a U-shaped groove is formed on the side surface of the flat box, and the reduced pressure insulation material 3 with elastic bodies 7 attached to both ends is inserted, so that the elastic pressure of the elastic body forms the U-shaped groove. Both ends of the vacuum insulation material 3 are tightly fixed into the inside of the foam insulation material 6, and the vacuum insulation material 3 does not shift due to the foaming pressure of the foam insulation material, so the insulation performance of the composite insulation panel becomes uneven or deteriorates. It has the advantage of preventing

Effects of the Invention The present invention has the above-described configuration, and provides the following effects.

Since an elastic body is attached to the end of the vacuum insulation material so as to be located between the U-shaped groove and the vacuum insulation material, the elastic pressure of the elastic body causes both ends of the vacuum insulation material to form the U-shaped groove. Since it can be fixed in place, there will be no displacement of the vacuum insulation material due to the foaming pressure of the foam insulation material.
It is possible to prevent the insulation performance of the composite insulation panel from becoming uneven or decreasing. Then, an elastic body is attached to the end of the vacuum insulation material so as to be located between the U-shaped groove and the vacuum insulation material, so that the foam insulation material is exposed to the outside from between the box and the vacuum insulation material. It won't leak.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional composite insulation panel, Figure 2
Figures A, B, and C are cross-sectional views showing the conventional method for manufacturing composite heat-insulating panels, Figure 3 is a cross-sectional view of the composite heat-insulating panel of the present invention, and Figure 4 is a perspective view of the box of the composite heat-insulating panel shown in Figure 3. 5A, 5B, and 5C are cross-sectional views showing a method of manufacturing the composite heat insulating panel shown in FIG. 3. 1'...Composite insulation panel, 2...Box, 4...Reduced pressure insulation panel, 5...Foam insulation material, 6...U-shaped groove, 7...Elastic body.

Claims (1)

[Claims] 1 A U-shaped groove provided at the upper end of one of the two pairs of opposing side surfaces of a box with an open upper surface made of a thin plate, and a U-shaped groove provided on the top surface of the box. a vacuum insulation material with both ends inserted into the groove, an elastic body affixed to the end of the vacuum insulation material so as to be located between the U-shaped groove and the vacuum insulation material, and the box and vacuum insulation material. A composite insulation panel with a foam insulation material in the middle of the insulation material.