JPH04224397A - Manufacture of powder vacuum heat insulating body - Google Patents

Abstract

PURPOSE:To obtain a powder vacuum heat insulating body which is light in weight and inexpensive and simple in structure. CONSTITUTION:Powder bodies 14 are filled up between a pair of opposite wall bodies 11, 12, and this powder body filling up portion is subjected to vacuum exhaust and baking treatment. As for powder bodies 14, sepiolite is used which is sintered and solidified or consolidated by becoming ceramic, due to heat at that time. As powder bodies are consolidated, they function as a back up material, and the occurrence of buckling due to atomospheris pressure can be prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a powder vacuum insulation material, and more particularly to a method for manufacturing a powder vacuum insulation material for use in pipes, panels, containers, etc. having heat insulation performance.

0002

[Prior Art] Conventionally, as a powder vacuum insulation material for constructing a relatively large container such as a liquefied gas storage tank, powder is filled into a space between a pair of opposing walls, and then the space is filled with powder. There is one that is evacuated. Perlite, silica, diatomaceous earth, glass fiber, etc. are used as the powder.

By evacuating the space, atmospheric pressure acts on the outer surface of the powder vacuum insulation, but the powder itself has poor pressure resistance. Therefore, in the past, the wall for forming the space to be filled with powder was thickened, or a spacer 6 was placed between the two walls 1 and 2 as shown in FIG. This prevents the occurrence of bending. In addition, in FIG. 2,
4 powder is filled into the space formed by the walls 1 and 2 and the end member 5. 3 is a vacuum heat insulating layer, which is obtained by evacuation and baking of a space filled with powder 4.

0004

[Problems to be Solved by the Invention] However, if the wall is made thick as described above, there are problems in that the cost of the product increases and the weight of the product increases. Further, if the spacer 6 is provided as shown in FIG. 2, there is a problem that the structure of the product becomes complicated and the manufacturing thereof requires time and effort.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and to provide a powder vacuum heat insulating material which can reduce the weight of the product and does not require the use of spacers.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention fills powder for forming a vacuum heat insulating layer between a pair of opposing walls, and then fills the inside of this vacuum heat insulating layer. The powder is solidified by heat during evacuation and baking.

[0007]

[Operation] According to the above structure, the solidified powder itself gives pressure resistance to the vacuum heat insulating body. In other words, the solidified powder is
It has high pressure resistance and functions as a backup material for both opposing walls, thereby preventing buckling due to atmospheric pressure.

[0008]

[Embodiment] As shown in FIG. 1, a pair of opposing wall bodies 11, 1
2, and a powder 14 having heat insulating properties is filled in this space. Thereafter, the space is evacuated and subjected to baking treatment to remove gas, thereby obtaining the vacuum heat insulating layer 13. Then, the powder 14 is solidified by the heat during baking. 15 is an end member.

[0009] The powder 14 is heated at a relatively low temperature (500°C to
Insulating materials that solidify at 850 °C), such as sepiolite (compositional formula (OH2)4 (OH)4 M
g8Si12O306-8H2O), etc., and the baking temperature during evacuation is 500°C to 850°C. Through this heat treatment, the powder 14 is solidified by sintering or solidified into ceramic, and is transformed into a vacuum heat insulating material having pressure resistance.

In the powder vacuum insulation structure having the above configuration,
The powder 14, which has solidified and has a pressure-resistant strength, functions as a backup material for both opposing walls 11 and 12, and prevents buckling due to atmospheric pressure.

[0011]

Effects of the Invention As described above, according to the present invention, the powder that has solidified to have pressure resistance functions as a backup material for both opposing walls, thereby preventing the occurrence of buckling due to atmospheric pressure. To prevent. Therefore, in a powder vacuum insulation product that is not subjected to internal pressure, it is possible to reduce the thickness of the opposing wall, making it possible to reduce the weight and cost of the product. Further, even powder vacuum insulation products having a wide flat surface such as a rectangular container or a panel can be easily manufactured without the need to provide a spacer between the opposing walls.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a powder vacuum heat insulator according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a conventional powder vacuum insulation body.

[Explanation of symbols]

11 Wall 12 Wall 13 Vacuum insulation layer 14 Powder

Claims (1)

[Claims] 1. Powder for forming a vacuum insulation layer is filled between a pair of opposing walls, and then the powder is A method for producing a powder vacuum insulation material, characterized by solidifying the powder.