JPS58127084A - Heat insulating box body - 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 heat insulating box using a vacuum heat insulating material pack, which is used as a heat insulating box for a refrigerator or the like.

Conventional insulation boxes for freezers, refrigerators, etc. have a vacuum insulation pack placed between the inner box and outer box, and the gap is completely filled with foamed insulation material such as hard urethane foam to improve the wall thermal conductivity o. Attempts have been made to obtain a heat insulating box having high heat insulation properties of , olola'm h °C or less. but,
When disposing a single vacuum insulation pack by integrally foaming a 7-ohm hard urethane pack, the following problems occurred.

■ Even if you take great care when handling the vacuum insulation pack, the exterior is made of a plastic film or metal foil laminate sheet, so it is prone to scratches and is likely to deteriorate in quality due to vacuum leaks, making it difficult to maintain high insulation properties over the long term. There was a problem.

@ A puncture in the vacuum insulation material becomes an obstruction to the fluidity when filling the rigid urethane foam, which creates a void-like area where the urethane foam is not filled on the surface of the vacuum insulation material pack, making the high insulation level insufficient. Ta.

The present invention takes the above points into consideration and provides a heat insulating box that enables high heat insulation.

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

In the figure, reference numeral 1 denotes a heat insulating box body consisting of an outer box 2 made of iron plate or the like, an inner box 3 made of plastic or the like, and a heat insulating material 4 made of hard urethane 7 ohm filled between the outer box 2 and the inner box 3. Reference numeral 6 denotes a bag-like airtight container made of a composite laminate film 6 of metal foil-plastics, etc. The airtight container 6 is filled in advance with inorganic foamed powder 7 such as perlite, and the airtight container 6 is filled with inorganic foamed powder 7 such as perlite.
It is degassed to a vacuum level of 0 Torr. Reference numeral 8 covers the surface layer of the closed container 5 with a skin made of soft urethane foam or the like having breathability and cushioning properties and having approximately two thicknesses. The airtight container thus formed 5. A vacuum insulation pack 14 is formed from the inorganic foamed powder 7 and the skin 8. Numeral 9 is a hole provided in the inner box 3 into which a plurality of support pins 10 made of plastic or the like are pushed. A similar hole 12 is provided in the sealing part 11 of the airtight container 6, and one end of the plurality of support pins 1° is pushed into the hole 12 of the heat sealing part 11, and the airtight container 5 is connected to the outer box 2 and the inner part. It is located and fixed approximately in the center of the space 13 formed by the box 3.

In such a product, when the urethane foam raw material is injected into the space 13 formed by the outer box 2 and the inner box 3, foaming begins and the filling progresses. The airtight container 5 is fixed in the space 13 in advance by a plurality of support pins 1o pushed into the holes 9 of the inner box 3 and the holes 12 of the sealing part 11 of the airtight container 6. Since the skin 8 before and after the thickness is covered, the hard urethane foam 4 wraps and fills the airtight container 6 so as to bleed due to its breathability. There are no void-like unfilled areas, and the target performance can be achieved without impairing insulation properties. Since the thickness of the skin 8 is around 2mm, it is completely impregnated with the hard urethane foam 4, and the adhesion with the sealed container 5 is sufficiently guaranteed, and heat shock and cracks of the hard urethane foam 4 due to insufficient adhesion are also avoided. It is something to prevent. In addition, since the surface layer of the sealed container 5 is covered with the skin 8, it is possible to prevent scratches when handling the sealed container 5 alone, and as a result, long-term vacuum leaks due to minute scratches are eliminated, contributing to quality stability. It is something to do.

In this example, soft urethane foam was used as the skin 8, but flocked hair, nonwoven fabric, nonwoven paper, or 5 pads have cushioning properties, and the same effect can be obtained with materials having continuous spaces. It is.

In this way, the present invention covers the outer peripheral surface of a sealed container made of a laminated film filled with inorganic foamed powder and held in a vacuum with a soft skin. It is inserted into the space between the sealed container and the inner and outer boxes, and is foamed with a heat insulating material such as hard urethane foam. This eliminates the void-like unfilled areas that occur in the past, and the target performance can be achieved without impairing insulation properties.

In addition, it is possible to prevent scratches and the like when handling the sealed container alone, and there is no long-term vacuum leak due to minute scratches, which contributes to quality stability.

[Brief explanation of the drawing]

Figure 1 is a cutaway perspective view of the main part of the insulation box body showing an example of the book [gM], Figure 2 is a cross-sectional view of Figure 1, and Figure 3 is an enlarged sectional view of the main part. be. 2...Outer box, 3...Inner box, 4...
・・Foam insulation material, 6・・Airtight container, 8・・・・
...epidermis.

Claims (2)

[Claims] (1) The outer surface of an airtight container made of laminated film filled with inorganic foam powder and having a reduced pressure inside is covered with a skin that has breathability and cushioning properties, and this airtight container is formed between an outer box and an inner box. An insulating box that is located in a closed space and filled with foam insulation material between the sealed container and the inner and outer boxes. (2) The insulation box according to claim 1, wherein the skin is made of soft urethane foam, flocked hair, or nonwoven fabric.