Vacuum heat insulating body, and heat insulating container and heat insulating wall employing same

Abstract

A vacuum heat insulating body includes core material and outer packing material that vacuum-seals core material. Core material includes first heat insulating core material and second heat insulating core material having ventilation characteristics. Moreover, first heat insulating core material has ventilation resistance greater than the ventilation resistance of second heat insulating core material. First heat insulating core material is configured with an open-cell resin, and second heat insulating core material is configured with a fiber material or a powder material having ventilation resistance smaller than the ventilation resistance of the open-cell resin.

Description

TECHNICAL FIELD[0001]The present invention relates to a vacuum heat insulating body, and a heat insulating container and a heat insulating wall employing the same.BACKGROUND ART[0002]Recently, from the viewpoint of prevention of global warming, improvement of energy saving is strongly demanded and also becomes an urgent problem in household electric appliances. Particularly, in heat-retaining / cold-keeping equipment such as a refrigerator, a freezer, and a vending machine, from the viewpoint of efficiently utilizing heat, a heat insulating material having excellent heat insulating performance is required.[0003]As general heat insulating materials, materials selected from a fiber material such as glass wool, and a foamed body such as urethane foam are employed. In order to improve the heat insulating performance of the heat insulating materials, the heat insulating material is required to be increased in thickness. However, in a case where there is restriction in a space which is to b...

AI Technical Summary

Benefits of technology

The invention provides a vacuum heat insulating body that improves vacuum drawing efficiency and enhances productivity. The heat insulating container and wall using the same feature these improvements. The invention reduces the thickness of the heat insulating core material with significant ventilation resistance, allowing for a shorter ventilation path and faster vacuum drawing. This reduces gas coming out from the open-cell resin and avoids deformation and degradation of heat insulating properties. Overall, the invention improves the efficiency and productivity of vacuum heat insulation.

Problems solved by technology

Recently, from the viewpoint of prevention of global warming, improvement of energy saving is strongly demanded and also becomes an urgent problem in household electric appliances.

However, in a case where there is restriction in a space which is to be filled with the heat insulating material, for example, in a case where space saving is required or the space is required to be effectively used, the heat insulating material cannot be applied.

However, in a case of being used in a refrigerator and the like, the heat insulating space of the heat insulating case body generally exhibits a complicated shape.

Accordingly, there is limitation in improving the ratio of the area which can be covered with the vacuum heat insulating material, that is, the area of the vacuum heat insulating material occupying in the total heat transfer area of the heat insulating case body.

When the open cells are formed in alignment in a moving direction of heat, the heat insulating properties are not improved.

However, since cells are disorderedly formed through foaming, there is little possibility that the cells are formed in alignment in the moving direction of heat.

Therefore, there are problems in that it takes times to perform vacuum drawing, productivity is degraded, and the cost increases.

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