JPH0796566A - Vacuum heat-insulating material - Google Patents

Abstract

PURPOSE:To enable a vacuum heat-insulating material to be attached to adjacent wall surfaces of a heat-insulating box at a time by providing a plurality of independent vacuum heat-insulating parts. CONSTITUTION:A vacuum heat-insulating material 1 consists of a covering member 2 shaped into a container form using a resin material having a metallized surface and a heat-insulating member 3 made of an inorganic power material or an inorganic fiberous material and loaded inside the covering member. A vacuum is drawn in the vacuum heat-insulating material 1. The covering member 2 consists of a first film member 12 having a plurality of adjacent recessed parts and a second film member 13 covering the respective recessed parts of' the first film member. Both the film members are hot welded double at a predetermined interval at a part connecting the adjacent recessed parts. Opposed side faces of the adjacent recessed parts of the first film member are each formed at a predetermined angle.

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 material having an inorganic fiber material or an inorganic powder material filled therein.

[0002]

2. Description of the Related Art (I) Japanese Patent Publication No. 63-35 prior to the present invention
No. 911 discloses a method for manufacturing a powder vacuum heat insulating plate, and (II) Japanese Patent Publication No. 63-58391 discloses a method for manufacturing a vacuum structure. In both publications, a fine powdery heat insulating material such as pearlite is used as a container (coating member) made of metal or resin.
And a vacuum is applied to the inside of the container, and then the container is sealed to form a heat insulating structure.

[0003]

However, the above-mentioned problem is solved.
When applying the vacuum heat insulation panel manufactured by the technology disclosed in the publications (I) and (II) to the heat insulation wall of the heat insulation box such as the refrigerator or the showcase, the vacuum heat insulation panels are manufactured one by one. Needless to say, it is necessary to attach one sheet to each of different surfaces of the inner box or the outer box of the heat insulating box, so that there is a problem that the manufacturing work and the fixing work of each heat insulating panel are complicated and time-consuming.

Therefore, an object of the present invention is to provide a vacuum heat insulating material which is provided with a plurality of independent vacuum heat insulating parts and can be attached at one time to adjacent wall surfaces of an outer box or an inner box of a heat insulating box.

[0005]

The vacuum heat insulating material of the present invention comprises:
A covering member formed in a container shape with a resin material having a metal deposited on the surface and a heat insulating member made of an inorganic powder material or an inorganic fibrous material filled in the inside of the covering member, and the inside of the container is A vacuum heat-insulating material that has been evacuated, and wherein the covering member has a first film member having a plurality of adjacent recesses, and a second film member that covers the recesses of the first film member. And a portion connecting the adjacent concave portions of the both film members is heat-welded.

According to a second aspect of the present invention, in the vacuum heat insulating material, the covering member includes a first film member having a plurality of adjacent recesses.
The second film member covers the respective concave portions of the first film member, and the side surfaces of the concave portions adjacent to each other of the first film member facing each other are formed at predetermined angles.

Further, in the vacuum heat insulating material according to claim 3, the coating member comprises a first film member having a plurality of adjacent recesses,
A second film member that covers each recess of the first film member, and a portion connecting the adjacent recesses of the both film members is doubly heat-welded at a predetermined interval, and the first film member is welded. The opposite side surfaces of the adjacent concave portions of the film member are formed at predetermined angles.

[0008]

According to the vacuum heat insulating material of the first aspect, the first and second
Since the portion connecting the adjacent recesses of the film member is heat-welded, it is possible to make the plurality of recesses of the vacuum heat insulating material into independent vacuum spaces, and for some reason a vacuum break occurs in one vacuum space. However, the degree of vacuum in the remaining vacuum space does not change.

According to the vacuum heat insulating material of the second aspect, since the facing side surfaces of the adjacent recesses of the first film member are formed at a predetermined angle, the facing side surfaces are adjacent to each other. The vacuum heat insulating material can be bent at the portion connecting the recesses.

According to the vacuum heat insulating material of the third aspect, the portions connecting the adjacent concave portions of both film members are doubly heat-welded at a predetermined interval, and the adjacent concave portions of the first film member are adjacent to each other. Since the opposite side surfaces are formed at a predetermined angle, the plurality of concave portions of the vacuum heat insulating material are used as independent vacuum spaces, and the portion of the portion connecting the adjacent concave portions that is not heat-welded is used as a bending margin. In addition, when the vacuum heat insulating material is bent at the portion connecting the adjacent recesses, the opposite side surfaces can be brought into contact with each other and can be attached to the adjacent wall surface of the outer or inner box of the heat insulating box at once. it can.

[0011]

Embodiments of the vacuum heat insulating material of the present invention will be described below with reference to the drawings. 1 is an external perspective view of the vacuum heat insulating material of the present invention, FIG. 2 is a plan view of the first film member side for explaining the heat-welded portion of the vacuum heat insulating material, FIG. 3 is a sectional view taken along line AA of FIG.
FIG. 4 is an external perspective view of the vacuum heat insulating material in a bent state, and FIG.
FIG. 3 is a cross-sectional view of an exploded state when the vacuum heat insulating material of the present invention is attached to an outer box of a refrigerator.

1 to 5, reference numeral 1 denotes a vacuum heat insulating material. 2 and 3, the vacuum heat insulating plate 1 is covered with two covering members 2 in which a metal such as aluminum is vapor-deposited on a resin surface such as PET (polyethylene terephthalate) or polyvinylidene chloride, and a non-woven fabric having a predetermined shape. The heat insulating member 3 is selected from an inorganic powder material such as white carbon or an inorganic fiber material such as glass wool (non-woven fabric is unnecessary).

In FIG. 3, the covering member 2 includes a first film member 12 having a plurality of (four in the present embodiment) recesses 11 (11A to 11D) adjacent to each other, and each of the first film members 12. The second film member 13 is arranged so as to cover the recess 11. Four recesses 11 of this embodiment
A to 11D are three recesses 11 in which one recess 11B remains.
All of A, 11C, and 11D are arranged next to each other. However, the arrangement in the case of four recesses is not limited to this example, but this arrangement is adopted in consideration of shortening the time for vacuuming to be described later. Further, the number of recesses is not limited to four and may be two or more.

In FIGS. 2 and 3, the first and second film members 12 and 13 have one recess (in this embodiment, 1).
1B) the edges except for the exhaust portion 14 defined on one side are heat-welded in a U shape, and the portion connecting the adjacent recesses 11 and the exhaust portion 14 are doubly heat-welded at a predetermined interval. Further, the facing side surfaces of the adjacent recesses 11 of the first film member 12 are formed so as to be inclined at a predetermined angle (45 ° in this embodiment).
Further, in the present embodiment, the portion that is heat-welded in the U-shape is referred to as the first welding area 15, and the recesses 1 that are double-heat-welded and adjacent to each other are formed.
The portion that connects 1 is the second welding area 16, and the portion that is double heat welded and corresponds to the exhaust portion 14 is the third welding area 17,
In order to show the work procedure of heat welding, the second welding area 16 is further divided into three.
The first seal portion 16A, the second seal portion 16B, and the bent portion 16C between the seal portions are divided into two parts. In the present embodiment, the second welding region 16 is doubly heat-welded at a predetermined interval, but the heat-welding portion is whitened by bending the vacuum heat insulating material.
If there is no problem such as cracks or cracks, the same heat welding as in the first welding area 15 may be performed.

In FIG. 5, 20 is a metal outer box, and 21 is AB.
An inner box made of resin such as S, and the outer side surface of the vacuum heat insulating material 1 bent in the state shown in FIG.
C, the top surface 20B, and the back surface 20D are each attached using a fixing member such as an adhesive. It is suitable to attach the vacuum heat insulating material to a portion corresponding to the freezing room having the largest temperature difference from the outside air temperature. When mounted on the outer surface of the inner box 21, the expanded shape of the vacuum heat insulating material 1 may be changed as appropriate.

On the other hand, when glass wool is used as the heat insulating member 3, no nonwoven fabric is required. If the inside of the heat insulating member is partitioned into a plurality of sections by a laminated film so that the heat insulating member 3 is in a laminated state, the resin covering member 2
It is possible to reduce the thermal effect due to the gas that has permeated the gas or thermal energy, and to adsorb the permeated gas with this heat insulating member 3, while reflecting the electromagnetic waves of gas molecules and heat and reducing the conduction heat transfer, the vacuum heat insulation is performed. The degree of vacuum of the material 1 (in other words, the heat insulation performance) can be stabilized over a long period of time, and the heat insulation material can be used for a long time.

As another embodiment of the heat insulating member, particles of calcium silicate which are lightweight and inexpensive and have low thermal conductivity for reducing heat transfer due to conduction, which will be described later, and for reducing heat transfer due to radiation of electromagnetic waves. A mixture of metal particles such as alumina having a high reflectance and zeolite particles for adsorbing gas molecules to reduce heat transfer due to convection may be adopted. In addition, as the adsorption pores of the zeolite particles, 3
There are angstroms to several tens of angstroms, but if the pores have 4 angstroms, both carbon dioxide gas having a molecular size of about 3.5 angstroms and water vapor of 2.8 angstroms can be adsorbed. .

Here, the heat transfer will be described. First, there are three types of heat transfer: (a) conduction heat transfer, (b) convection heat transfer, and (c) radiation (radiation) heat transfer. Then, the inside of the container is evacuated (that is, the number of molecules in the internal gas is reduced) to reduce the convective heat transfer (that is, heat transfer due to molecular collision in the internal gas) in (b) above. This is because as the number of molecules decreases, the distance between molecules (that is, the mean free path between molecules) increases, which reduces the chances of molecular collisions. It will be about. On the other hand, (a) conduction heat transfer is the movement of heat performed through the contact portions between particles that are in contact with each other, and (c) heat transfer by radiation is performed by electromagnetic waves emitted from a heat source. It is the transfer of heat.

Next, the procedure for producing the vacuum heat insulating material 1 will be briefly described. First, in a vacuum furnace equipped with a vacuum device such as a compressor and a heat-welding device (neither is shown), the surface on which aluminum is vapor-deposited is the inner side in order to reduce the conduction electric heat on the base. Film member 1
2 is placed, glass wool as a heat insulating member is placed in each recess 11 of the film member 12, and the second film member 13 is placed so as to cover each recess 11. Then, the exhaust portion 1 defined on one side of one concave portion (11B in this embodiment)
After heat-welding the peripheral edges (the above-mentioned first welding area 15) except 4 in a U-shape, the vacuum furnace was set to 0.1 to 0.01 Torr.
By evacuating to a certain degree, the exhaust unit 14 is removed from each recess 1
The air inside 1 is also evacuated, so that the inside of the vacuum furnace and the inside of each recess 11 have substantially the same degree of vacuum. Next, three second welding zones 16
First seal portion 16 having a width smaller than that of first welding area 15
The second seal portion 16 having the same width dimension as the first seal portion 16A is formed by forming a bent portion 16C at a predetermined interval.
Form B. Finally, the vacuum heat insulating material 1 is completed by performing double thermal welding on the third welding area 17.

The vacuum heat insulating material 1 thus prepared
Is capable of reducing the heat conductivity to about 1/2 to 1/3 as compared with the conventionally used urethane foam heat insulating material having the same thickness, and the heat conductivity of the vacuum heat insulating material of the present embodiment is 0.
It was 005 to 0.006 Kcal / mh ° C. Also,
Since the portion (that is, the second welding region 16) connecting the adjacent recesses of the first and second film members 12 and 13 is doubly heat-welded at a predetermined interval, the plurality of recesses 11 are separated from each other. An independent vacuum space is provided, and a portion connecting adjacent concave portions is not heat-welded (that is, the bent portion 16
C) can be used as a bending allowance, and when the bent portion 16C is bent, the resin is whitened, cracked, or cracked for some reason. Even if this occurs, the degree of vacuum in the remaining recess does not change. Further, since the facing side surfaces of the adjacent recesses are formed to be inclined at a predetermined angle, when the vacuum heat insulating material 1 is bent at the bent portion 16C, the facing side surfaces come into contact with each other. The heat transmitted through the film member 12 can be dispersed to the adjacent recesses to suppress the heat transfer, and the surface of the outer box 20 of the heat insulating box body such as the refrigerator or the showcase on the side of the heat insulating material (for example, the left and right side surfaces 20A and 20C). The vacuum heat insulating material 1 can be attached at one time to adjacent wall surfaces such as the top surface 20B and the back surface 20D) or the heat insulating material side surface of the inner box 21, and the mounting work can be simplified (see FIG. 5).

In particular, when the vacuum heat insulating material 1 is attached to the outer case, even if a force is applied to the outer case from the outside, the force can be received by the outer case and the second film member 13 is not damaged. The vacuum insulation of the vacuum heat insulating material 1 can be prevented, and when the vacuum heat insulating material 1 is attached to the inner box, the inner box is cooled and, as a result, the foamed heat insulating material filled between the inner and outer boxes is cooled. Can be suppressed.

Finally, the reason why the thermal conductivity of the vacuum heat insulating material is lower than that of the conventional heat insulating material made of urethane foam will be briefly described. Freon gas (for example, R-11, R-22, etc.) as a foaming gas used for urethane foaming belongs to the category of low thermal conductivity in the gas, but since it is a gas body, the heat transfer by convection described above is avoided. Needless to say, the degree is greater than that in the vacuum state.
In the vacuum heat insulating material of the present invention, the degree of vacuum is 0.1 to 0.
Since it is 01 Torr, it is stated that the ratio of convective heat transfer to the total heat transfer is about 10%. If it is assumed that the heat transfer due to radiation and the heat transfer due to conduction are the same in the vacuum heat insulating material and the heat insulating material made of urethane foam, the difference in convective heat transfer is expressed as the difference in thermal conductivity between the two.

[0023]

According to the vacuum heat insulating material of the first aspect of the present invention, since the portions connecting the adjacent concave portions of the first and second film members are heat-welded, a plurality of concave portions of the vacuum heat insulating material are formed. Can be made independent vacuum spaces, and the vacuum degree of the remaining concave portion does not change even if a vacuum break occurs in one concave portion of the plurality of concave portions for some reason.

According to the vacuum heat insulating material of claim 2 of the present invention,
Since the opposite side surfaces of the adjacent concave portions of the first film member are formed to incline at a predetermined angle, the vacuum heat insulating material is bent at the portion connecting the adjacent concave portions so that the opposite side surfaces are in contact with each other. be able to.

According to the third aspect of the vacuum heat insulating material, the portions connecting the adjacent concave portions of both film members are doubly heat-welded at a predetermined interval, and the adjacent concave portions of the first film member are adjacent to each other. Since the opposite side surfaces are formed at a predetermined angle, a plurality of concave portions of the vacuum heat insulating material are used as independent vacuum spaces, and a portion where the adjacent concave portions are not heat-welded is used as a bent portion. Further, when the vacuum heat insulating material is bent at the portion connecting the adjacent concave portions, the opposite side surfaces are brought into contact with each other.
The heat transmitted through the film member can be dispersed to the adjacent recesses to suppress the heat transfer, and it can be attached at one time to the outer wall or the inner wall of the heat insulating box such as a refrigerator or showcase. Becomes

[Brief description of drawings]

FIG. 1 is an external perspective view of a vacuum heat insulating material of the present invention.

FIG. 2 is a plan view of a first film member side for explaining a heat-welded portion of a vacuum heat insulating material.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an external perspective view of a state in which a vacuum heat insulating material is bent.

FIG. 5 is a cross-sectional view of an exploded state when the vacuum heat insulating material of the present invention is attached to an outer box of a refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2 Covering member 3 Heat insulating member 11 Recessed portion 12 First film member 13 Second film member 14 Exhaust part 15 First welding area 16 Second welding area 17 Third welding area

Front page continuation (72) Inventor Kenji Tsukamoto 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. A covering member formed in a container shape from a resin material having a metal vapor-deposited on its surface, and a heat insulating member filled inside the covering member and made of an inorganic powder material or an inorganic fibrous material, In the vacuum heat insulating material in which the inside of the container is evacuated, the covering member includes a first film member having a plurality of adjacent recesses, and a second film member covering each recess of the first film member. A vacuum heat insulating material, characterized in that the portion connecting the adjacent concave portions of the both film members is heat-welded. 2. A covering member formed in a container shape from a resin material having a metal vapor-deposited on its surface, and a heat insulating member filled inside the covering member and made of an inorganic powder material or an inorganic fibrous material, In the vacuum heat insulating material in which the inside of the container is evacuated, the covering member includes a first film member having a plurality of adjacent recesses, and a second film member covering each recess of the first film member. The vacuum heat insulating material is characterized in that the opposite side surfaces of the adjacent concave portions of the first film member are formed at predetermined angles. 3. A covering member formed in a container shape from a resin material having a metal vapor-deposited on its surface, and a heat insulating member filled inside the covering member and made of an inorganic powder material or an inorganic fibrous material, In the vacuum heat insulating material in which the inside of the container is evacuated, the covering member includes a first film member having a plurality of adjacent recesses, and a second film member covering each recess of the first film member. And a portion connecting the adjacent concave portions of the both film members is doubly heat-welded at a predetermined interval, and the side surfaces of the adjacent concave portions of the first film member facing each other have a predetermined angle. A vacuum heat insulating material characterized by being formed.