JP3357747B2 - Insulation structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating structure formed by fixing a vacuum heat insulating material to a surface to be mounted.

[0002]

2. Description of the Related Art Conventionally, as a heat insulating material for keeping cold or warm, an inorganic material such as glass fiber and an organic material such as polyurethane foam have been used. Although the glass fiber and the like have good heat resistance, the thermal conductivity is 0.03 to
As high as 0.05 Kcal / mh ° C., the heat insulation effect is not good. In the case of the foamed polyurethane, 0.015
Although a thermal conductivity of about Kcal / mh ° C. can be achieved, when used as a heat insulating box of a refrigerator having an extremely low temperature inside the refrigerator (for example, −90 ° C. or less), the heat is still required to obtain a predetermined heat insulating performance. The conductivity is high, so that the thickness of the insulation wall must be significantly increased.

In recent years, for example, Japanese Patent Publication No. 61-17 / 1986
No. 263 (B32B5 / 18) and JP-B-63-35
No. 911 (F25D23 / 06) or Tokuhei 2
Japanese Patent Application Laid-Open No. 54479 (F16L59 / 06) has come to use a vacuum heat insulating material.

[0004] This vacuum heat insulating material is a film having a multilayer laminate structure (gas barrier film) for preventing gas permeation.
After enclosing a heat insulating material made of fine powder of silica, perlite or the like, or open-cell foamed polyurethane in a bag made of, the gas (air) in the bag is evacuated and sealed in a vacuum state. According to such a vacuum insulating material, 0.0
Since the thermal conductivity of 0.5 to 0.010 Kcal / mh ° C. is achieved, the thickness of the heat insulating wall of the refrigerator is reduced to reduce the installation area, or to increase the internal volume, or to reduce the power consumption of the cooling device. It becomes possible to reduce.

On the other hand, when such a vacuum heat insulating material is fixed to a wall surface of the refrigerator or the like, a structure as shown in FIG. 8 has conventionally been adopted. That is, in FIG. 8, reference numeral 1 denotes the above-mentioned vacuum heat insulating material. For example, the above-mentioned two sheets of the above-mentioned laminated thermal insulating layer made of polyethylene or polypropylene, an aluminum layer, and a surface protective layer (Japanese Patent Publication No. 2-54479). A non-illustrated, for example, open-celled foamed polyurethane heat insulating material is inserted between the gas barrier films 2 and the inside thereof is evacuated in a predetermined evacuation device, and then the peripheral portion 2A of the gas barrier film 2 is heated to form the heat welding layer. Are welded to each other and sealed.

Then, an adhesive sheet 100 is attached to the surface of the vacuum heat insulating material 1 (the surface of the surface protective layer), or the adhesive material (also 100 Is applied in advance, and the vacuum heat insulating materials 1 are adhered to the door outer plate 4 one by one.

[0007]

As described above, conventionally, an adhesive sheet is previously adhered to the vacuum heat insulating material 1 or the surface to be attached (the door outer plate 4), or the adhesive is applied in advance, and thereafter, one by one. Since the vacuum insulating material is attached to the surface to be attached, the position cannot be easily adjusted once it is attached. Therefore, it is difficult to keep the mounting position constant, and the handling becomes troublesome. In addition, if the mounting position is shifted, it is necessary to peel off the adhesive, apply the adhesive again, and re-attach the adhesive. Was extremely complicated.

The present invention has been made to solve the above-mentioned conventional technical problem, and an object of the present invention is to provide a heat insulating structure having improved workability when fixing a vacuum heat insulating material to a surface to be mounted. And

[0009]

According to a first aspect of the present invention, there is provided a heat insulating structure wherein a vacuum heat insulating material obtained by sealing a heat insulating material in a gas barrier film is fixed to a surface to be mounted. A heat-welding layer made of a heat-welding material is laminated on the surface of the film on the side of the attachment surface , and the whole is heated by a heating device, and the heat-welding layer is heated and melted to form the vacuum heat insulating material. It is characterized in that it is fixed to the mounting surface.

Further, the heat insulating structure of the invention of claim 2, moth
Vacuum insulation material consisting of insulation material sealed in a sub barrier film
Is fixed to the surface to be attached,
Laminated on the surface of the film
A heat welding layer made of a heat welding material, and a heat welding layer made of a heat welding material formed on the surface of the mounting surface; and a heat welding layer laminated to a gas barrier film of the vacuum heat insulating material. The heat insulating layer formed on the mounting surface is brought into close contact with the entire surface, and the whole is heated by a heating device, thereby heating and melting both the heat bonding layers to fix the vacuum heat insulating material to the mounting surface. .

According to the present invention, the heat-welding layer made of the heat-weldable material is heated and melted to fix the vacuum heat insulating material to the surface to be mounted. Therefore, this heat-welding layer does not adhere before heating. Therefore, positioning and handling of the vacuum heat insulating material with respect to the mounting surface are extremely easy. Thereby,
The workability of mounting the vacuum heat insulating material can be significantly improved. In particular, since the heat welding layer is laminated on the surface of the gas barrier film constituting the vacuum heat insulating material on the surface to be mounted, it is not necessary to separately bond a heat welding sheet or the like to the surface of the vacuum heat insulating material. According to the invention, the work related to the mounting surface side is unnecessary, and the mounting workability can be further improved. Further, in the second aspect, since the heat welding layer is also formed on the mounting surface side,
The mounting state of the vacuum heat insulating material becomes more stable.

[0012]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. In each figure, the same reference numerals as those in FIG. 8 denote the same elements. FIG. 1 is an exploded side view of a vacuum heat insulating material 1 and a door outer plate 4 constituting a heat insulating door D as an embodiment of the heat insulating structure of the present invention, and FIG. FIG. 3 is a side view of the state, and FIG.

The vacuum heat insulating material 1 comprises a foamed polyurethane heat insulating material (not shown) between two gas barrier films 2 each of which is laminated with a heat welding layer made of polyethylene or polypropylene and an aluminum layer and a surface protective layer. After the gas barrier film 2 is inserted and the inside is evacuated in a predetermined evacuation device, the peripheral edge portion 2A of the gas barrier film 2 is heated so that the heat-welded layers are welded to each other and sealed.

The gas barrier film 2 on one side (upper side in the figure) of the vacuum heat insulating material 1 is formed in a container shape in advance.
The other (lower side in the figure) gas barrier film 2 is a flat plate. A heat-welding plastic sheet (or film) 6 made of polyethylene, polypropylene, or the like is laminated on the surface (the lower surface in FIG. 1) of the flat gas barrier film 2.

On the other hand, the door outer plate 4 serving as a mounting surface is made of a painted steel plate or a stainless steel plate, and its surface (FIG. 1).
Is coated with a heat-sealable plastic layer 7 also made of polyethylene or polypropylene.

When fixing the vacuum heat insulating material 1 to the door outer plate 4, the vacuum heat insulating material 1 is placed at a predetermined position on the door outer plate 4 as shown by an arrow in FIG. The conductive plastic sheet 6 and the heat-welding plastic layer 7 are brought into close contact with each other (the state shown in FIG. 2). In this state, the heat-welding plastic sheet 6 and the heat-welding plastic layer 7 are melted and, therefore, do not adhere to each other, so that the positioning of the vacuum heat insulating material 1 with respect to the door outer plate 4 is easy. I can do it.

Next, the vacuum heat insulating material 1 and the entire door outer plate 4 are heated to, for example, about + 100 ° C. by a heating device (not shown). By such heating, the heat-welding plastic sheet 6 and the heat-welding plastic layer 7 are melted, and then fixed to each other after being cooled and solidified. By such a welding action, the vacuum heat insulating material 1 is fixed to the surface of the door outer panel 4.

FIG. 3 shows this state. The heat-insulating door D as an example of the heat-insulating structure is, for example, a door of an ultra-low-temperature refrigerator (not shown), and a door outer plate 4 constituting the door has a rectangular container shape as a whole, and the vacuum heat-insulating material 1 is provided on its inner surface. Upper and lower are attached. After fixing the vacuum heat insulating material 1, a door inner plate (not shown) is attached, and a space inside the heat insulating door D other than the vacuum heat insulating materials 1 and 1 is filled with, for example, a polyurethane foam (not shown) by an in-situ foaming method. The heat insulation door D is completed.

In the above-described embodiment, the gas barrier film 2 of the vacuum heat insulating material 1 is formed by laminating the heat-sealable plastic sheet 6 on the front surface (the lower surface in FIG. 1). As in the case of No. 4, the heat-welding plastic layer may be coated on the gas barrier film 2 or the heat-welding plastic sheet 6 may be attached to the surface of the gas barrier film 2 by adhesion.

Further, in the embodiment, the entirety of the heat insulating plastic sheet 6 and the entire heat sealing plastic layer 7 are welded by heating the entire vacuum heat insulating material 1 and the door outer plate 4, but the invention is not limited thereto. Only the portion corresponding to the peripheral edge portion 2A may be spot (partially) heated and welded.

Next, FIGS. 4 and 5 show another embodiment of the present invention. In this case, the surface (upper surface in FIG. 4) of the gas barrier film 2 on one side (upper side in the figure) of the vacuum heat insulating material 1 and the gas barrier film 2 on the other side (lower side in FIG. 4)
The heat-welding plastic sheet 6 is laminated on both surfaces (the lower surface in FIG. 4).

As described above, the vacuum heat insulating material 1 is heat-welded to the door outer plate 4. The heat-welding plastic sheet 6 is laminated and placed on the entire surface of the gas barrier film 2 of the vacuum heat insulating material 1. When the vacuum heat insulating material 1 is attached between the two plates, the vacuum heat insulating material 1 can be welded to both plates, resulting in an extremely suitable structure.

FIGS. 6 and 7 show still another embodiment of the present invention. In this case, the three sides of the peripheral edges 6A, 6A of the two heat-sealable plastic sheets 6, 6 are welded in advance and placed in a bag shape, and the vacuum heat insulating material 1 is inserted into the bag and evacuated. The remaining one side is welded to provide a heat-welding plastic sheet 6 on the entire surface of the gas barrier film 2. With such a structure, the same effect as described above can be obtained.

In each of the above embodiments, a vacuum heat insulating material in which open-cell foamed polyurethane is enclosed is used. However, the present invention is not limited to this, and a vacuum heat insulating material using general fine powder of silica or pearlite may be used. . Further, in the embodiment, the vacuum heat insulating material is fixed to the door outer plate. However, the present invention is not limited to this. For example, a heat insulating wall constituting a heat insulating box of an ultra-low temperature refrigerator may be used. The invention is valid.

[0025]

As described above in detail, according to the present invention, the heat welding layer made of the heat welding material is heated and melted to fix the vacuum heat insulating material to the mounting surface. It does not adhere before heating, so that positioning and handling of the vacuum heat insulating material with respect to the surface to be mounted becomes extremely easy. Thereby, the workability of attaching the vacuum heat insulating material can be remarkably improved. In particular, since the heat welding layer is laminated on the surface of the gas barrier film constituting the vacuum heat insulating material on the mounting surface side, there is no need to separately bond a heat welding sheet or the like to the surface of the vacuum heat insulating material. According to the first aspect of the present invention, the work related to the surface to be mounted becomes unnecessary, and the mounting workability can be further improved. Further, in the second aspect, since the heat welding layer is also formed on the mounting surface side, the mounting state of the vacuum heat insulating material is further stabilized.

[Brief description of the drawings]

FIG. 1 is an exploded side view of a vacuum heat insulating material and a door outer panel constituting a heat insulating door as an example of a heat insulating structure of the present invention.

FIG. 2 is a side view showing a state in which a vacuum heat insulating material is fixed to a door outer plate.

FIG. 3 is a perspective view of the heat insulating door.

FIG. 4 is an exploded side view of a vacuum heat insulating material and a door panel showing another embodiment of the present invention.

FIG. 5 is a side view showing a state where the vacuum heat insulating material of FIG. 4 is fixed to a door outer plate.

FIG. 6 is an exploded side view of a vacuum heat insulating material and a door outer panel showing still another embodiment of the present invention.

7 is a side view showing a state where the vacuum heat insulating material of FIG. 6 is fixed to a door outer plate.

FIG. 8 is a view for explaining a conventional vacuum heat insulating material mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2 Gas barrier film 4 Door outer plate (mounting surface) 6 Heat-welding plastic sheet (heat-welding layer) 7 Heat-welding plastic layer (heat-welding layer) D Heat-insulating door (heat-insulating structure)

Continuation of the front page (72) Inventor Kazushi Yamaoka 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Satomi Hagiguchi 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (56) References JP-A-4-160298 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 59/06 F25D 23/06

Claims (2)

(57) [Claims] 1. A heat insulating structure in which a vacuum heat insulating material in which a heat insulating material is sealed in a gas barrier film is fixed to a mounting surface, wherein a heat-welding material is provided on a surface of the gas barrier film on the mounting surface side. A heat welding layer consisting of
A heat insulating structure, wherein the whole is heated by a heating device, and the heat welding layer is heated and melted to fix the vacuum heat insulating material to the mounting surface. 2. A heat insulating material is sealed in a gas barrier film.
Insulation structure fixed to a mounting surface by vacuum insulation material consisting of
The lamination on the surface of the gas barrier film on the mounting surface side.
A heat-welding layer made of a heat-sealed material, and a heat-welding layer made of a heat-weldable material formed on the surface of the mounting surface, and laminated on a gas barrier film of the vacuum heat insulating material. And the heat welding layer formed on the surface to be attached is brought into close contact, and the whole is heated by a heating device to heat and melt both the heat welding layers and fix the vacuum heat insulating material to the surface to be mounted. A heat insulating structure characterized by the following .