JPH0798174A - Vacuum thermal insulating panel and thermal insulating case - Google Patents

Abstract

PURPOSE:To enable a high thermal insulating performance to be maintained for a long period of time by a method wherein a cylindrical outer shell member is used and there are provided two connection parts of the outer shell members. CONSTITUTION:A container-like outer member 22 is formed into a bag having an opening at one side of an upper end by connecting the one side of a cylindrical outer shell member 23 to a connection part 24 at its lower end, for example, and a filling material 29 is stored in a space 28 through the opening. Then, air in the space 25 is discharged by vacuum suction through the opening, and then the opening is air-tightly connected with the connection part 24. In this way, as the outer shell member 23 constituting the container-like outer member 22, a cylindrical member is and thereby the four locations in the prior art for the connection part 24 of the outer shell member 23 are changed into two locations and correspondingly the possibility that gas enters the space 28 is reduced and the degree of vacuum is deteriorated as compared with that of the prior art. With such an arrangement as above, it is possible to maintain a high thermal insulating performance for a long period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum heat insulating panel formed by evacuating a container-shaped outer casing containing a filling body, and a heat insulating casing suitable for a household electric refrigerator using the vacuum heat insulating panel. .

[0002]

2. Description of the Related Art In this type of vacuum heat insulation panel, for example, a non-breathable film mainly made of plastic (a plastic film with an aluminum foil attached to one side in advance, or an aluminum vapor deposition layer on one side) Prepare a container-shaped exterior body made by joining the outer shell member made of laminated plastic films) to each other, and have a heat insulating property in a bag having air permeability such as paper or nonwoven fabric. A filling body pre-formed into a predetermined shape containing a material such as pearlite powder or silica fine powder, or a filling body made of plastic foam having a high continuous porosity is prepared. The air inside the container-shaped exterior body is exhausted by vacuuming through the opening of the outer shell member while being housed in the body, and then the opening is removed. Those constituted by joining by thermal welding means are known.

7 and 8 show an example of a conventional structure of a vacuum heat insulating panel. 7 and 8, the container-shaped exterior body 1 includes two outer shell members 2 and 2 having a rectangular shape.
Is formed by joining the peripheral portions thereof (the joining portion is indicated by 2a) (in FIG. 7, the joining portion is indicated by x for convenience). The outer shell member 2 is made of a non-breathable laminated film. Specifically, an aluminum film 4 for blocking ventilation is provided on one surface of a plastic film 3 serving as a base material by adhesion or vapor deposition means. Along with this, a three-layer structure is provided in which a heat seal layer 5 made of a thermoplastic is provided on the surface of the aluminum film 4, and the outer shell members 2 and 2 are joined by thermocompression bonding of the heat seal layer 5. ing.

In the space 6 inside the container-like exterior body 1, a filling body 7 is provided.
This filling body 7 contains a heat insulating material 9 made of perlite powder or silica fine powder, which is a heat insulating material, in a breathable bag 8 such as paper or nonwoven fabric. It is preformed into a predetermined shape.

The vacuum heat insulating panel 10 having such a structure is manufactured by the following steps. That is, by stacking two outer shell members 2 and 2 and joining their three sides at the joining portion 2a, the container-shaped exterior body 1 is formed into a bag shape having an opening on one side. Then, the filling body 7 is accommodated in the space 6 through the opening. Next, the air in the space 6 of the container-shaped exterior body 1 is discharged through the opening by vacuuming, and then the opening is airtightly joined at the joint 2a.

On the other hand, FIG. 9 shows a heat insulating casing 11 of a refrigerator constructed by using a plurality of vacuum heat insulating panels 10 having the above construction.
Is shown. The heat insulating casing 11 has the following configuration. That is, a plurality of the vacuum heat insulating panels 10 are arranged in the space portion 15 in the outer shell body 14 configured by combining the inner box 12 and the outer box 13, and the vacuum heat insulating panels 1 are arranged.
A foam insulation material 16 made of polyurethane foam is foam-filled around 0.

[0007]

The vacuum heat insulating panel 10 having the above-described structure has excellent heat insulating properties such that the initial thermal conductivity is about 0.004 to 0.006 kcal / mh.degree. It is about 3 times when compared with the conventional heat insulation panel using rigid polyurethane foam.
There is an advantage that the heat insulation performance can be expected to be more than doubled.

However, in the vacuum heat insulating panel 10 having the above-mentioned structure, although the degree of vacuum in the container-shaped outer casing 1 is maintained at a sufficiently high level in the initial stage to exhibit high heat insulating performance, it is used for a long period of time. In such a case, the degree of vacuum is deteriorated due to the entry of gas such as air from the joints 2a of the outer shell member 2 constituting the container-shaped outer casing 1, and the heat insulation performance is deteriorated with the deterioration of the degree of vacuum. There is a reason to do it.

In the heat insulating casing 11 using such a vacuum heat insulating panel 10, by covering the vacuum heat insulating panel 10 with the foam heat insulating material 16, the container-shaped outer casing 1 is formed.
It is possible to reduce the invasion of gas to the inside to some extent,
It cannot be completely shut off.

On the other hand, in recent years, from the viewpoint of environmental protection and effective utilization of resources, the problem of waste recycling has come to the fore.
A typical example of this is large household appliances waste represented by refrigerators, and it is necessary to promote recycling by recycling as much as possible.

When recycling from waste, it is a necessary condition that the constituent materials can be easily dismantled and that the materials can be separated. It is said that the recycling of plastic materials has been established to some extent, but in the case of the heat insulating casing 11 of the refrigerator, the foam heat insulating material 16, the inner box 12, the outer box 13 and the vacuum heat insulating panel 10 are firmly formed. Since they are adhered, there is a problem that they are difficult to disassemble and poor in recyclability.

[0012] Therefore, an object of the present invention is to provide a vacuum heat insulation panel capable of suppressing the invasion of gas from the joint portion of the outer shell member and maintaining a high heat insulation performance for a long term,
In a heat insulating housing using such a vacuum heat insulating panel,
An object of the present invention is to provide a heat insulating housing that can be easily disassembled and can be easily recycled.

[0013]

DISCLOSURE OF THE INVENTION The present invention provides a container-like exterior body formed by joining the ends of an outer shell member made of a non-breathable film, and a heat insulation housed in the container-like exterior body. A filling body having a property, the air inside the container-shaped outer body is discharged through the opening of the outer shell member while the filling body is housed in the container-shaped outer body, and the opening is airtightly joined. In the vacuum heat insulation panel configured as described above, a cylindrical member is used as the outer shell member, and the outer shell member has two joints (claim 1).

The vacuum heat insulating panel according to claim 1 is arranged in a space in the outer shell formed by combining the inner box and the outer box so that the joints of the vacuum heat insulating panel gather at the corners of the outer shell. It is preferable that the heat insulating casing is configured by arranging and filling the space portion facing the joint portion with the foam heat insulating material (claim 2).

[0015]

According to the vacuum heat insulation panel of the first aspect, by using a tubular outer shell member constituting the container-shaped exterior body, the joint portion of the outer shell member is the same as the conventional one.
Since there are two locations from the location, there is less chance of gas intrusion, and the degree of vacuum is less likely to deteriorate than before,
As a result, high heat insulation performance can be maintained for a long period of time.

According to the heat insulating casing of the second aspect, by using the vacuum heat insulating panel, high heat insulating performance can be maintained for a long period of time. Further, in the space inside the outer shell, only the space facing the joint of the vacuum heat insulating panel is filled with the foamed heat insulating material, so that when disassembled, each member can be easily separated and separated. Like

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 show the vacuum insulation panel 21 in a completed state. The container-shaped exterior body 22 is configured by joining the outer shell member 23 having a tubular shape at the joining portions 24 at the upper and lower ends in FIG. 3 (the joining portion is indicated by x for convenience in FIG. 3).

The outer shell member 23 is made of a non-breathable laminated film. Specifically, one side of the plastic film 25 as a base material is formed by vapor-depositing aluminum for blocking ventilation on one side. A film 26 is provided, and a heat seal layer 27 made of thermoplastic is provided on the surface of the aluminum film 26.
It has a layered structure, and the outer shell members 23 are joined by thermocompression bonding of the heat seal layer 27.

In this case, in the aluminum film 26,
Aluminum is not vapor-deposited on a part, for example, the left and right end portions 26a, 26a in FIG. The reason why aluminum is not vapor-deposited on a part of the aluminum film 26 is to prevent a heat short circuit between the front surface side and the back surface side of the container-shaped exterior body 22.

A filling body 29 is housed in the space 28 inside the container-shaped exterior body 22. The filling body 29 accommodates a heat-insulating material 30a having a low gas adsorbing property, such as perlite powder or fine silica powder, which is a heat-insulating material, in a bag 30 having air permeability such as paper or non-woven fabric. It is preformed in the shape of.

The vacuum heat insulating panel 21 having such a structure is manufactured by the following steps. That is, the cylindrical outer shell member 2
3 is joined at one side, for example, the joint 24 at the lower end in FIGS. 2 and 3, to form the container-shaped exterior body 22 in the shape of a bag having an opening at one side on the upper end side, The filler 29 is accommodated in the space 28 through the opening. Then, the air in the space 28 of the container-shaped exterior body 22 is discharged through the opening by vacuuming, and then the opening is airtightly joined at the joint 24.

Vacuum insulation panel 2 constructed as described above
According to 1, the outer shell member 23 forming the container-shaped exterior body 22
Since a cylindrical member is used as the outer shell member 23, the number of the joint portions 24 of the outer shell member 23 is from two in the conventional case to two. In this way, the number of joints 24 is reduced,
Since the chance of gas entering the space portion 28 side decreases,
The degree of vacuum is less likely to deteriorate than in the past, and high heat insulation performance can be maintained for a long period of time.

Here, in order to evaluate the difference in heat insulating performance due to the difference between the structure according to the present embodiment and the conventional structure, the inventor of the present application makes the following measurements, and FIG.
The time-dependent change characteristics as shown in FIG. 5 were obtained. That is, the sample A of the vacuum heat insulation panel 21 of the present embodiment using a cylindrical outer shell member 23 and the conventional vacuum heat insulation panel 1 in which two sheet-shaped outer shell members 2 are stacked.
Sample B of No. 0 was prepared, and these Samples A and B were left in the atmosphere at an atmospheric temperature of 60 ° C., and the changes in thermal conductivity and internal air pressure with time were measured.

FIG. 4 shows the time-dependent characteristic of the thermal conductivity of the vacuum heat insulating panel. From this characteristic, the degree of decrease in the heat insulating performance of the sample A of this example is the same as that of the conventional sample B. It can be seen that it is significantly smaller than the degree of decrease. Further, FIG. 5 shows a time-dependent characteristic of the air pressure inside the vacuum heat insulating panel. From this characteristic, the degree of deterioration of the degree of vacuum inside the sample A of the present embodiment is the same as the degree of vacuum inside the conventional sample B. It can be seen that it is significantly smaller than the degree of deterioration.

From the above measurement results, in the structure of this embodiment (Sample A), the number of the joint portions 24 of the outer shell member 23 constituting the container-shaped exterior body 22 is small and the space portion 2 is small.
It is considered that since the gas can be prevented from entering the 8 side, the degree of vacuum is less likely to be deteriorated as compared with the conventional case, and high insulation performance can be maintained for a long period of time.

On the other hand, FIG. 6 shows a heat insulating casing 31 of a refrigerator constituted by using the plurality of vacuum heat insulating panels 21 having the above-mentioned structure. The heat insulating casing 31 has the following configuration. That is, a plurality of the vacuum heat insulating panels 21 are attached to the space portion 35 in the outer shell body 34 configured by combining the inner box 32 made of plastic and the outer box 33 made of steel plate, and the joint portion 24 of the vacuum heat insulating panels 21 is the outer shell. The space portion 35 is arranged so as to be gathered at the corner portion 34a of the body 34, and the joint portion 24 faces the space portion 35.
A foam insulation material 36 made of foamed polyurethane is foamed and filled only in this area. In this case, in the front end portion of the outer shell body 34, the foam heat insulating material 36 is also foam-filled in the space portion 35 facing the joint portion 24 of the vacuum heat insulating panel 21. The vacuum heat insulating panel 21 has a different size depending on the location of the outer shell 34.

According to the heat insulating casing 31 having such a structure, by using the vacuum heat insulating panel 21 having excellent heat insulating performance, it is possible to maintain high heat insulating performance for a long period of time. Further, the heat insulating casing 31 has the outer shell member 2 of the vacuum heat insulating panel 21 in the space 35 inside the outer shell 34.
The foamed heat insulating material 36 is provided only in the space 35 facing the joint 24 of FIG.
When the refrigerator is discarded and dismantled, the inner box 32, the outer box 34, and the foam insulation 3
6 and the respective members of the vacuum heat insulating panel 21 can be easily separated and separated, and therefore, dismantling and recycling are easy.

[0028]

According to the vacuum heat insulating panel of the first aspect, by using a cylindrical outer shell member constituting the container-shaped outer casing, the joint portion of the outer shell member is
Since there are two places instead of the conventional four places, there is less chance of gas intrusion, the degree of vacuum is less likely to deteriorate than in the past, and it is possible to maintain high heat insulation performance for a long time. Produce an effect.

According to the heat insulating casing of the second aspect, by using the vacuum heat insulating panel, high heat insulating performance can be maintained for a long period of time. Further, in the space inside the outer shell, only the space facing the joint of the vacuum heat insulating panel is filled with the foamed heat insulating material, so that when disassembled, each member can be easily separated and separated. As a result, it can be easily disassembled and easily recycled.

[Brief description of drawings]

1 is a cross-sectional view showing a vacuum heat insulating panel according to an embodiment of the present invention, taken along the line EE in FIG.

FIG. 2 is a cross-sectional view of the vacuum heat insulating panel taken along the line of FIG.

FIG. 3 is a plan view of a vacuum heat insulation panel.

FIG. 4 is a characteristic diagram of the temporal change of the thermal conductivity of the vacuum insulation panel.

FIG. 5: Characteristic diagram of change over time of air pressure inside the vacuum insulation panel

FIG. 6 is a vertical sectional side view of a heat insulating casing using the vacuum heat insulating panel of the present invention.

FIG. 7 is a view corresponding to FIG. 3 showing a conventional example.

FIG. 8 is a sectional view taken along the line Har in FIG.

FIG. 9 is a diagram corresponding to FIG. 6 using a conventional vacuum heat insulation panel.

[Explanation of symbols]

21 is a vacuum heat insulation panel, 22 is a container-like exterior body, 23 is an outer shell member, 24 is a joint part, 25 is a plastic film,
26 is an aluminum film, 27 is a heat seal layer, 29 is a filler, 31 is a heat-insulating housing, 32 is an inner box, 33 is an outer box, 3
4 is an outer shell, 35 is a space, and 36 is a foamed heat insulating material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichi Hirashiki 1-6 Ota Toshiba-cho, Ibaraki City, Osaka Prefecture Toshiba Corporation Osaka Plant

Claims (2)

[Claims] 1. A container-shaped exterior body formed by joining ends of an outer shell member made of a non-breathable film,
A heat-insulating filling body housed in the container-shaped exterior body, and air in the container-shaped exterior body is discharged through the opening of the outer shell member in a state where the filling body is contained in the container-shaped exterior body. In addition, in a vacuum heat insulation panel configured by hermetically joining the openings thereof, a tubular heat insulator is used as the outer shell member, and the outer shell member has two joining portions. panel. 2. The vacuum heat insulating panel according to claim 1 is arranged in a space in an outer shell formed by combining an inner box and an outer box so that joints thereof are gathered at a corner of the outer shell. In addition, the foamed heat insulating material is filled only in the space facing the joint.