JPH07103955B2 - Vacuum insulation - Google Patents

Description

TECHNICAL FIELD The present invention relates to a flat vacuum heat insulating material.

[Background of the Invention]

The vacuum heat insulating material having a high heat insulating function is only a cylindrical or spherical structure because of its pressure resistant structure, but recently, a flat plate-like or box-like structure incorporating a spacer has been considered.

This spacer is made by stacking thin filaments of inorganic fibers such as glass fibers in the direction perpendicular to the heat transfer direction, and has a heat insulating function by multi-step contact heat resistance, but it is low density as it is and Large compression deformation,
Since the whole panel is greatly deformed and it becomes difficult to incorporate it, a needle with a hook (hereinafter referred to as a needle) is used to penetrate a part of the fiber in the direction perpendicular to the stacking direction, that is, in the heat transfer direction to increase the density. , A means to reduce the compressive deformation has been taken, but this means performs a penetration in which a part of the fiber coincides with the heat transfer direction. Therefore, there is a drawback that heat is directly transmitted to the other surface and the heat insulating function is deteriorated.

[Object of the Invention]

The present invention has been made to remedy the above defects.

[Outline of Invention]

The above purpose is such that the length direction of the inorganic fine fiber (4a) is at right angles to the heat transfer direction and the fine fiber (4a)
a) The inorganic fine fiber mat (4), which is randomly laminated so that the length directions thereof intersect with each other and makes point contact with each other, and these point contacts are multi-tiered in the heat transfer direction, and this inorganic fine fiber mat It is composed of a flat plate panel made of a stainless material in which the small diameter fiber mat (4) is installed, and the inner thin inorganic fiber mat (4) is installed inside the flat panel. In the vacuum heat insulating material in which the length direction of the small diameter fiber (4a) is perpendicular to the heat transfer direction and the inside of this flat panel is made into a high vacuum, the heat is transferred to the laminated small diameter fiber (4a). The flat panel is provided with penetration fibers (4b) that are driven in parallel to the heat direction to form a high-density inorganic fine fiber mat (4), and a plurality of the inorganic fine fiber mats (4) are stacked. Achieved by using a vacuum insulation material installed inside It is.

Example of Invention

An embodiment of the present invention will be described with reference to FIGS. 1 to 5. Reference numeral 1 is a stainless steel material, and a shallowly pressed diaphragm outer plate, 1a is a flange thereof, and 1b is a diaphragm outer plate 1. A cylindrical collar 2 provided on the bottom portion is an outer plate that serves as a lid for the diaphragm outer plate 1, and is combined with the diaphragm outer plate 1 to form a flat panel. Reference numeral 3 is a vacuum drawing pipe, one end of which is welded to the collar 1b. Reference numeral 4 denotes a high density inorganic fine fiber mat, which is provided in the flat panel by stacking a plurality of sheets. The heat resistance of the above-mentioned fine inorganic fibers is several hundreds as long as it can prevent gas generation, and the material is not particularly limited. 4a is a fine fiber of the above-mentioned inorganic fine fiber mat 4, and this fine fiber 4a is the main direction of the fine fiber 4a when the fine inorganic fiber mat 4 is installed in the flat panel, that is, The thin fibers 4a are randomly laminated so that the lengthwise direction of the thin fibers 4a is perpendicular to the heat transfer direction and the lengthwise directions of the perpendicular thin fibers (4a) intersect with each other. Contact is made, and this point contact is made to have multiple stages in the heat transfer direction. 4b is a penetration fiber that is orthogonal to this thin fiber,
The driving may be performed from both sides or only one side.

In order to construct a vacuum heat insulating material with such parts, first, a large number of inorganic fine fiber mats 4 are placed inside the concave plate of the diaphragm outer plate 1, the outer plate 2 is covered, and the flange 1a and the outer plate are attached. The outer peripheral portion of the plate 2 is airtightly welded, a vacuum pump (not shown) is connected to the evacuation pipe 3, and it is heated to a high temperature while being evacuated to accelerate degassing, and after heating and degassing, the evacuation pipe is drawn. A part of 3 is completely cut off to complete the vacuum heat insulating material.

〔The invention's effect〕

The vacuum heat insulating material configured as described above is such that the thin fibers 4a of the stacked inorganic thin fiber mats 4 which are housed in the flat plate-like panel and serve as spacers are perpendicular to the heat transfer direction and randomly. Since they are laminated, the heat conduction has the contact heat resistance of multi-stage point contact and has a high heat insulation function. Moreover, the penetration fiber 4b driven in the heat transfer direction in order to make this inorganic fine fiber mat 4 high density Since there is no break between the layers of the two stacked inorganic fine fiber mats 4, there is no direct heat conduction between the diaphragm outer plate 1 and the diaphragm outer plate 2, and the heat loss due to the penetration fiber 4b is small. There is an effect that can be. In addition to the reduction in heat loss due to the absence of direct heat conduction between the diaphragm outer plate 1 and the outer plate 2 via the penetration fiber 4b, convection loss is due to vacuum and radiation loss is due to low thermal conductivity. Since it can be prevented by a stainless steel material, it is possible to provide a vacuum heat insulating material that exhibits a high heat insulating function as a whole.

[Brief description of drawings]

FIG. 1 is a perspective view of a vacuum heat insulating material, FIG. 2 is a vertical sectional view of FIG. 1, FIG. 3 is a perspective view of superposed inorganic fine fiber mats, and FIG. FIG. 5 is a side view enlarged view of the superposed inorganic fine fiber mats. 1 ... diaphragm outer plate, 1a ... flange, 1b ... collar, 2 ...
... Outer plate, 3 ... Vacuum pipe, 4 ... Inorganic fine fiber mat, 4a ... Fine fiber, 4b ... Penetration fiber.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shun Takehara, 6 Kinuoka, Moka, Tochigi Prefecture, Fuji-Fai Bargrass Co., Ltd. (72) Inventor, Yasumi Miyashita, 6 Kinuoka, Moka, Tochigi Prefecture Incorporated (56) Reference JP 54-21655 (JP, A) JP 57-47124 (JP, A) JP 58-106292 (JP, A) JP 60-14695 (JP, A) A)

Claims (1)

[Claims] 1. An inorganic fine fiber (4a) having its length direction at right angles to the heat transfer direction and at the right angle.
a) The inorganic fine fiber mat (4), which is randomly laminated so that the length directions thereof intersect with each other and makes point contact with each other, and these point contacts are multi-tiered in the heat transfer direction, and this inorganic fine fiber mat It is composed of a flat plate panel made of a stainless material in which the small diameter fiber mat (4) is installed, and the inner thin inorganic fiber mat (4) is installed inside the flat panel. In the vacuum heat insulating material in which the length direction of the small diameter fiber (4a) is perpendicular to the heat transfer direction and the inside of this flat panel is made into a high vacuum, the heat is transferred to the laminated small diameter fiber (4a). The flat panel is provided with penetration fibers (4b) that are driven in parallel to the heat direction to form a high-density inorganic fine fiber mat (4), and a plurality of the inorganic fine fiber mats (4) are stacked. A vacuum heat insulating material characterized by being installed inside.