JPS6319787B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for constructing vacuum structures such as heat insulating walls and sound insulating walls. It is generally well known that a so-called vacuum structure in which a vacuum space is formed is used for insulation walls or sound insulation walls of containers for keeping cold or heat insulating containers to improve their performance. However, in such a vacuum structure, even if the wall material forming the vacuum space is subjected to some physical impact and a slight pore or rupture occurs, the vacuum in the vacuum space will be broken. However, it has the disadvantage that originally required functions are completely lost. In view of the above-mentioned current situation, the present invention divides the vacuum space over the entire area, and even if pores or cracks occur in the wall material due to the physical impact, etc., the vacuum space can be partially evacuated. The purpose of the present invention is to provide a vacuum structure that does not lose its originally required functions even if it deteriorates. Its characteristics are that it has a compressive load resistance and has a porous structure with low thermal conductivity. Molded bodies of inorganic materials such as calcium silicate, ceramic foam, gypsum, shirasu balloons, glass balloons, perlite, etc. are made into plastic films. , vacuum packaged with metal foil-plastic film laminated film,
After a plurality of vacuum structures are loaded into the space between the wall materials to be formed, the wall materials are heated to a temperature that softens the plastic of the vacuum packaging body, and the space between the wall materials is evacuated. A method for constructing a vacuum structure, characterized in that a plurality of vacuum packaging bodies are brought into close contact with wall materials between wall materials, and a vacuum space is formed in a state where the vacuum space is divided into a plurality of sections by the packaging bodies. . The construction method of the present invention will be explained below with reference to the drawings. FIG. 1 shows a vacuum packaging body 1 used in the present invention, in which a supporting material 2 is covered with a packaging material 3 of a plastic film or a metal foil-plastic film laminated film, and the inside is evacuated. It is sealed. The support material 2 may be made of materials that can withstand vacuum loads, such as calcium silicate, ceramic foam, gypsum, shirasu balloon moldings, glass balloon moldings, and pearlite moldings, in terms of maintaining vacuum space, shape retention, and heat conduction. A molded body of an inorganic material with low thermal conductivity and a large number of pores is used. The packaging material 3 may be a gas-impermeable plastic film such as polyethylene, polypropylene, polystyrene, polymethyl methacrylate, nylon, polycarbonate, or polyethylene terephthalate, or a plastic film with thermal conductivity such as aluminum, stainless steel, or lead. A film laminated with a metal foil with a low temperature is used. The vacuum package 1 is sealed with its interior kept at a vacuum level of 10 ^-2 torr or less. The vacuum packaged body 1 constructed in this way is
As shown in FIG. 3, the space 14 formed by the wall materials 12 and 13 in which the vacuum structure 11 is to be formed is tightly packed so that no voids are formed. Note that when loading the vacuum package 1 into the space 14, it goes without saying that the vacuum package 1 can be arranged appropriately depending on the width and thickness of the space, or it can be loaded in multiple layers. Then space 14
After sealing the wall materials 12 and 13 constituting the space 14 except for the exhaust pipe 15 communicating with the exhaust pipe 15,
The space 14 in which the vacuum package 1 is tightly packed is evacuated by an evacuation means (not shown) such as a vacuum evacuation pump. At the same time wall material 12,1
3 is heated from its external surface in a burner or heating furnace. This temperature is the vacuum packaged body 1.
Preferably, the temperature is close to the melting point of the plastic film of the packaging material 3 forming the plastic film. That is, to illustrate this by illustrating the various plastic films mentioned above,

【table】

[Table] When the inside is evacuated while heating in such a state, the wall materials 12 and 13 are compressed toward the evacuated space 14, and the wall materials of the vacuum packaged body 1 tightly packed in the space 14 are compressed. 12,1
Since the wall materials 12 and 13 are in close contact with the surface of the vacuum package 1 facing the vacuum package 1 and are heated to a temperature that melts and softens the packaging material 3 of the vacuum package 1 as described above, the vacuum package 1 The surface of the packaging material 3 that is in contact with the wall materials 12, 13 is melted and fused to the wall materials 12, 13 very closely. When the evacuated space 14 reaches a predetermined degree of vacuum, the exhaust operation is stopped and the exhaust pipe 15 is sealed. In the vacuum structure 11 thus obtained, the vacuum space 14 forms an independent vacuum section for each of the plurality of vacuum packaging bodies 1, and the vacuum space 14
In addition, the vacuum gap 16 that occurs even when the vacuum packaging body 1 is tightly loaded is also caused by the wall material 1 of the true packaging body 1.
The packaging material 3 of the packaging body that comes into contact with 2 and 13 is the wall material 1
Each vacuum packaged body 1 is attached to
completely isolated. Moreover, as the heat-sealing portion 17 is completely integrated with the wall materials 12 and 13, the position of each vacuum package 1 is fixed, and the wall materials 12 and 13 are prevented from forming pores or being damaged. Even if the welded portion 17 occurs, the presence of the welded portion 17 not only prevents communication to the vacuum space 14, but also prevents the welded portion 17 from communicating with the vacuum space 14.
Even if the pores and ruptures occur, the vacuum deterioration will only occur in the vacuum package 1 placed at the location where the pores and ruptures have occurred, and the communication of the vacuum gap 16 with the atmosphere will be limited to the fused portion 1.
7 acts as a sealing member and is prevented. Next, the vacuum structure A constructed by the construction method of the present invention and the vacuum package were loaded between the wall materials, and the vacuum was simply drawn between the wall materials without fusing the package to the wall materials. For structure B and vacuum structure C, which is simply evacuated without loading a vacuum package between the wall materials, the change in thermal conductivity when pores are created in the wall materials is shown below. This is illustrated in Figure 4. As is clear from FIG. 3, the vacuum structure A obtained by the construction method of the present invention exhibits a very small decrease in its heat transmission coefficient even if pores are formed, and it is also In vacuum structures B and C, the thermal conductivity begins to deteriorate sequentially from the moment pores are formed, and 24
After some time, a deterioration of almost 100% of the initial heat transfer coefficient was observed. This is because in vacuum structure B, the vacuum in the gap created by loading the vacuum package is completely broken, and the insulation is maintained only by the loaded vacuum package. The vacuum of
The insulation function is significantly reduced. On the other hand, in the vacuum structure A obtained by the construction method of the present invention, the vacuum is broken only in the vacuum package placed in the wall material part where the pores are formed, and there is no effect on other vacuum packages. Not only is a sufficient vacuum maintained, but also the intervening sealing of the fused portion prevents communication with the pores in the gap in the space in which the vacuum packaged body is loaded, and the vacuum in the gap is also sufficiently maintained. Ru. Since the present invention is a method for constructing a vacuum structure as described above, it not only fixes the arrangement of the vacuum package and maintains a stable heat and sound insulation effect, but also allows the packaging material of the outer wall vacuum package to be By combining and integrating the three layers with the heat insulating space and supporting material, strength can be improved, and even if the wall material is damaged due to impact, only a portion of the loaded vacuum package will be damaged. To provide an impact-resistant vacuum structure capable of preventing vacuum deterioration in the vacuum space of other vacuum packages and the entire vacuum structure loaded with the same, and capable of maintaining sufficient vacuum. I can do it. Therefore, it has extremely great practical value, especially as a method of constructing heat insulating walls for portable refrigerated containers and the like.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a vacuum insulation package used in the vacuum structure of the present invention, Fig. 2 is a sectional view of the vacuum structure, Fig. 3 is an enlarged view of the vacuum structure A in Fig. 2, and Fig. The figure is a drawing showing the variation in thermal transmission coefficient due to wall breakage between a vacuum structure obtained by the construction method of the present invention and a vacuum structure obtained by another construction method. 1... Vacuum insulation package, 2... Support material, 3...
Packaging material, 11... Vacuum structure, 12... Outer wall, 1
3... Inner wall, 17... Fusion part.

Claims (1)

[Scope of Claims] 1. A vacuum package is prepared by vacuum packaging an inorganic material molded product having a porous structure with a plastic film and a metal foil-plastic film laminated film, and the vacuum package is used as a vacuum structure. The plastic film and the metal foil-plastic film laminated film of the vacuum package are placed on the inner surface of the wall material by heating the wall material to a temperature close to the melting point at which the plastic film softens. A method for constructing a vacuum structure, which comprises fusing the wall materials together, evacuating the space between the wall materials at the same time, and then sealing the space between the wall materials. 2 The inorganic material molded body is calcium silicate,
2. The method for constructing a vacuum structure according to claim 1, wherein the molded product is selected from ceramic foam, gypsum, a glass balloon molded product, a glass balloon molded product, and a pearlite molded product.