JPH0243951B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat insulating box for use in refrigerators and the like.

BACKGROUND ART FIGS. 1 to 4 show a conventional heat insulating box. This configuration will be explained below with reference to FIGS. 1 to 4.

In the figure, 1 is a heat insulating box body, which has a thermal conductivity of 0.0060Kcal/
It consists of a heat insulating material pack 5 with a thermal conductivity of about mhr°C and a foamed heat insulating material with a thermal conductivity of about 0.0130 Kcal/mhr°C using Freon 11 such as urethane foam filled between the inner and outer boxes as a foaming agent. Note that the insulation pack 5 is temporarily fixed to the inner surface of the outer box 3 with the adhesive 4 until the foam insulation material 6 is injected to prevent the insulation pack 5 from shifting from its predetermined position. This is to prevent this.

The heat insulating material pack 5 includes a fine powder 7 such as perlite in a non-breathable plastic laminate bag 8.
The bag 8 of the insulation pack 5 has countless irregularities of several millimeters when the bag 8 of the insulation pack 5 is degassed under reduced pressure or when the periphery is heat welded. Wrinkles 9 occur. When the heat insulating material pack 5 having countless wrinkles 9 on its surface is adhered to the outer box 3 with the adhesive 4 in this way, the convex portions of the wrinkles 9 and the outer case 3 are adhered, but the concave portions of the wrinkles 9 are difficult to adhere to. Therefore, a cavity 10 is formed. Moreover, even if the amount of adhesive applied was increased, it was not possible to completely eliminate the unbonded cavities 10.

Problem to be Solved by the Invention In other words, when foamed heat insulating material 6 is injected between outer box 3 and inner box 2 to which heat insulating material pack 5 having unbonded wrinkles 9 is fixed (state shown in FIG. 3) During foaming, the foamed heat insulating material 6 enters the unbonded cavity 10, and its foaming pressure of 0.1 to 0.3 Kg/cm ² becomes a force that peels off the heat insulating material pack 5 from the outer box 3. Then, the heat insulating material pack 5 may fall off from the outer box 3 or be distorted (the situation shown in FIG. 4). Therefore, in the above conventional example, the outer box 3 and the heat insulating material pack 5
The foamed insulation material 6 enters the unbonded cavity 10 of the bag, and the foaming pressure causes the insulation material pack 5 to fall off or become distorted, resulting in uneven insulation performance distribution, and in the worst case, the bag 8 is torn. There was a drawback that the depressurization of the heat insulating material pack 5 was destroyed. In addition, when the foam insulation material 6 passes through the cavity 10, the shape of the foam is deformed compared to other parts, so the compressive strength is normal.
When the strength decreases to below 0.9Kg/cm ² and at low temperatures below 0°C, the internal pressure of the Freon 11 causes the cavity 1 to
There was also a drawback that the foamed heat insulating material 6 of No. 0 contracted and the appearance of the outer box 3 was deformed accordingly.

The present invention eliminates the drawbacks of the conventional example described above, and prevents the foam insulation material from entering the cavity where the outer box and the insulation pack are not bonded, causing the insulation material pack to fall off or become distorted. The purpose of this invention is to prevent variations in the heat insulation performance distribution due to the heat insulating material, and to prevent deformation of the appearance of the outer box at low temperatures due to a decrease in the strength of the foamed heat insulating material that has penetrated.

Means for Solving the Problems In order to achieve the above object, the present invention provides a flat heat insulating material pack whose inside is depressurized and deaerated, whose outside is wrapped in a non-ventilated bag and whose periphery is sealed by thermal welding or the like. The present invention includes an adhesive for adhering and fixing the heat insulating material pack to the inner surface of the outer box, and a sealing material disposed around the periphery of the adhesive surface of the heat insulating material pack and the box body.

Effect According to the above configuration, since the sealing material seals the periphery of the adhesive between the insulation material pack and the box body, the foam insulation material enters into the unbonded cavity that is created between the box body and the insulation material pack. This prevents the insulation pack from falling out of the box due to the foaming pressure of the foam insulation material.

Embodiment The configuration of one embodiment of the present invention will be described below in the fifth section.
The description will be made with reference to FIGS. 8 to 8, and the same components as those of the conventional system will be given the same reference numerals and detailed description thereof will be omitted.

In the figure, reference numeral 11 denotes a sealing material made of soft urethane foam, which is disposed in a band shape at the periphery of the adhesive 4 that bonds the insulation pack 5 and the outer box 3, spanning the outer box 3 and the insulation pack 5. are doing. The method of assembly is to attach the bag 8 of the heat insulating material pack 5 to the inner surface of the outer box 3, covering the sealing material 11 and adhesive 4.

Therefore, when the foam insulation material 6 is injected between the inner and outer boxes (the state shown in FIG. 7), the foam insulation material 6 is separated from the adhesive 4 by the sealing material 11 and cannot enter the cavity 10. . Note that since the sealing material 11 is made of soft urethane foam, the foamed heat insulating material 6 impregnates the sealing material 11 and becomes resin, so it cannot enter the cavity 10.
Due to the foaming pressure, the insulation pack 5 does not fall off from the outer box 3 and the bag 8 is not damaged (the state shown in Fig. 8).
Constant insulation performance can always be obtained. Furthermore, since the foamed heat insulating material 6 does not enter the cavity 10,
There is an advantage that the appearance of the outer box 3 does not change due to shrinkage of the foamed heat insulating material 6 at low temperatures.

Although the heat insulating material pack 5 was attached, the heat insulating material pack 5 did not fall off from the inner box 2 even on the outer surface of the inner box, and a certain level of heat insulation performance was obtained, and foaming at low temperatures was prevented. There is no deformation of the appearance of the inner box 2 due to contraction of the heat insulating material 6.

Further, in the embodiment, the sealing material 11 is made of soft urethane foam, but it may also be made of vinyl chloride putty or silicone sealer.

Effects of the Invention The present invention has the above-mentioned configuration, and since the sealing material is provided around the periphery of the bonding surface between the heat insulating material pack and the outer box, the foamed heat insulating material enters the cavity to which the heat insulating material pack is not bonded. Since it does not penetrate, it can prevent variations in insulation performance distribution and deformation of appearance at low temperatures due to falling or distortion of the vacuum insulation material.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional heat insulating box, Fig. 2 is a partially sectional perspective view of a heat insulating material pack used in Fig. 1;
3 is a cross-sectional view of the foamed heat insulating material at the right side of the line -' in FIG. 1, FIG. 4 is a cross-sectional view taken along the line -' in FIG. 1, and FIG. 6 is a cross-sectional view of a heat insulating box for explaining an embodiment, and FIG. 6 is a partially sectional perspective view of the heat insulating material pack used in FIG. 5;
FIG. 7 is a sectional view taken along the line -' in FIG. 5 when the foam insulation material is filled, and FIG. 8 is a sectional view taken along the line -' in FIG. 5. DESCRIPTION OF SYMBOLS 1...Insulating box body, 2...Inner box, 3...Outer box, 4...Adhesive, 5...Insulating material pack, 6...Foaming insulation material, 11...
sealing material.

Claims (1)

[Claims] 1. A flat insulation material pack whose inside is decompressed and degassed and whose outside is wrapped in a non-ventilated bag and whose periphery is sealed by heat welding or the like; an adhesive for bonding and fixing the insulation material pack to the inner surface of the outer box; A heat insulating box body consisting of a sealant placed around the adhesive surface of the heat insulating pack and the box body, and a foamed heat insulating material filled in the gap between the inner and outer boxes.