JPH0120631Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The invention relates to an insulating box body used in refrigerators, etc., which includes an inner box, an outer box, and a foam insulation material and a vacuum insulation material between the inner and outer boxes. .

Conventional configurations and their problems In general, in an insulated box such as a refrigerator that is equipped with a cooling system such as a compressor and a cooler, if the cooling system is the same, the wall thickness of the insulated box, that is, the foam insulation made of polyurethane, etc. The thicker the material layer, the less heat is absorbed into the refrigerator from the outside, improving the cooling efficiency, and thus reducing the power consumption of the refrigeration system. but,
As the wall thickness increases, there are disadvantages such as a decrease in the effective internal volume of the refrigerator, an increase in the installation area due to the increase in the size of the outer box, and an increase in the weight of the main body. In order to eliminate this drawback, a material with higher heat insulating properties than the foam insulation material, ie, a vacuum insulation material such as silica built into a evacuated plastic container is used as an alternative to foam insulation materials such as polyurethane. Generally, the thermal conductivity of polyurethane foam insulation is 0.016kcal/mh℃
In contrast, the thermal conductivity of vacuum insulation materials such as silica is approximately 0.009 kcal/mh°C, which is approximately 1/2 that of polyurethane foam insulation materials. Therefore,
It has been proposed to use vacuum insulation and foam insulation together, such as by embedding vacuum insulation in the polyurethane insulation layer, thereby reducing the wall thickness of the insulation box and increasing the effective internal volume. In addition, we can expect a reduction in the installation area due to the reduction in the external volume of the outer box, and a reduction in the weight of the main unit.

Conventionally, when a vacuum insulation material is used in combination with a foam insulation material as described above, the vacuum insulation material sealed in a bag-shaped vacuum pack is attached and fixed to the back of the outer box with tape, adhesive, etc., and then the inner and outer boxes are attached. It is conceivable to fill foam insulation material between the gaps and between the vacuum insulation materials. However, in such cases, when the vacuum insulation material is closely fixed to the outer box, the top of the vacuum insulation material is fixed with tape, or an adhesive such as hot melt is applied to the vacuum insulation material and fixed to the outer box, and urethane However, if there are wrinkles on the surface of the vacuum insulation material, unevenness on the surface of the vacuum insulation material, or the outer box bulges, it may not be possible to fix the insulation tightly and the outer box and vacuum insulation may be damaged before and after foaming. There was a problem that Freon gas generated by the foaming agent accumulated between the materials, causing the outer box and vacuum insulation material to separate, resulting in deformation of the outer box.

Purpose of the invention The present invention was made in view of the above points, and its purpose is to prevent separation of the vacuum insulation material from the outer box before and after foaming the foam insulation material.

Structure of the invention In order to achieve this objective, the present invention tightly fixes the vacuum insulation material and the outer box through a flexible member with double-sided adhesive, and the outer box and the vacuum insulation material before and after foaming of the foam insulation material. This is to prevent peeling.

DESCRIPTION OF EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

First, a heat insulating box used in a refrigerator will be explained with reference to FIGS. 1 and 2. The insulation box body 1 includes an outer box 2, an inner box 5, and a foam insulation material 4 filled between these two boxes 2 and 5.
and the vacuum insulation material 3 buried between the outer box 2 and the foam insulation material 4, and the heat seal that is the joint between the vacuum insulation material 3 and its outer covering film, which tightly fixes the outer box 2 and the vacuum insulation material 3. It is made up of a flexible member 6 with a flexible double-sided adhesive, which is formed into a single-sided shape to support the parts.

In the above configuration, before filling the foam insulation material 4 between the inner box 5 and the outer box 2 of the heat insulation box 1, the vacuum insulation material 3 is first closely fixed to the outer box 2, and then the foam is filled. At this time, the outer box 2 and the vacuum heat insulating material 3 are closely fixed together via the flexible member 6 with flexible double-sided adhesive. By doing so, if there are irregularities (including wrinkles) on the surface of the vacuum insulation material 3 or if the surface is not parallel to the outer box 2, it can be absorbed by the flexibility of the flexible member 6 with flexible double-sided adhesive. 2 and the vacuum insulation material 3 are tightly fixed, and the vacuum insulation material 3 flows between the fixation of the heat seal part 7 and the outer box 2 and the vacuum insulation material 3, which obstructs the flow of foaming when the foam insulation material 4 is foamed. It is possible to prevent the intrusion of the foaming agent or the Freon gas contained in the foaming agent, and the effects of preventing deformation of the outer box 2 and preventing separation of the outer box 2 and the heat insulating material, that is, preventing deformation of the outer box 2, can be obtained.

Effects of the invention As is clear from the above explanation, the present invention aims to fix the vacuum insulation material and the outer box in close contact by interposing a flexible member with double-sided adhesive between the vacuum insulation material and the outer box. This has the effect of preventing deformation of the outer case due to the foamed insulation material entering between the vacuum insulation material and the outer case during foaming, and prevention of deformation of the outer case due to separation of freon gas, etc. be.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a heat insulating box equipped with a vacuum heat insulating material according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A-A' in FIG. 2...Outer box, 3...Vacuum insulation material, 4...Foamed insulation material, 5...Inner box, 6...Flexible foam with double-sided adhesive, 7...Vacuum insulation heat seal portion.

Claims (1)

[Scope of utility model registration request] The vacuum insulation includes an inner box, an outer box, a vacuum insulation material provided between the inner and outer boxes and covered with a film, and a foam insulation material filled between the inner and outer boxes and between the vacuum insulation material. A heat insulating box body equipped with a vacuum heat insulating material in which the outer box and the vacuum heat insulating material are tightly fixed through a flexible member with double-sided adhesive between the material and the outer box.