JPS62475Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a heat insulating material for pipes made of foamed synthetic resin, which is used, for example, in a heat insulating device for cryogenic fluid transport piping.

Conventionally, in the case of insulation devices for cryogenic fluid transport piping, a cylindrical piece-shaped foamed synthetic resin is attached to the outer circumferential surface of the piping in multiple layers using tightening materials such as steel bands, and then a moisture-proof material and an exterior material are applied to the surface. Those formed through many complicated processes such as construction have been frequently used.
Therefore, conventional heat insulating devices require a large amount of labor to form, and have the drawback of increasing construction time and costs. In order to improve this drawback, a heat insulating device can be formed by adhering a thin metal plate to the outer peripheral surface of the cylindrical piece-shaped synthetic resin foam in advance, or by using the self-adhesive force of the synthetic resin foam. Insulating materials for pipes have been proposed that streamline the process. However, in such pipe insulation materials, although thin metal sheets have extremely excellent performance as moisture-proofing materials and exterior materials, their coefficient of expansion is significantly different from that of foamed synthetic resins, so it is difficult to use them due to low-temperature shrinkage of foamed synthetic resins during pipe operation. The stress causes the thin metal plate and the foamed synthetic resin to partially peel off, resulting in wrinkles. Therefore, there is a drawback that the aesthetic appearance is impaired. In addition, if wrinkles occur at the butt portions of pipe insulation materials, moisture and water permeate through the butt portions, reducing insulation properties, and furthermore, the insulation material may be destroyed due to freezing. The disadvantage is that the function as a heat insulating device is lost.

This invention eliminates the above-mentioned drawbacks, effectively prevents the foamed synthetic resin from peeling from the thin metal plate due to shrinkage, and thereby improves the insulation effect and simplifies the insulation device of cryogenic fluid transport piping. To provide a heat insulating material for pipes which can be formed into layers.

Next, this invention will be explained in detail based on the attached drawings showing the mode of implementation. 1 is a foamed synthetic resin for heat insulation in the shape of a cylindrical piece cut vertically, and an elastic sheet is preliminarily attached to the outer peripheral surface of the resin. A thin metal plate 3 is bonded to the back side of the metal plate 2 with an adhesive, and is combined into an integral structure by using an adhesive or by utilizing the self-adhesive force of the cylindrical foamed synthetic resin when it is foamed.

The cylindrical piece-shaped foamed synthetic resin 1 is cut out from a foam block body made of hard urethane foam, isocyanurate foam, etc., and foamed by pouring the foamed synthetic resin stock solution into a mold of the desired shape.The foamed synthetic resin is applied to the surface of the rotating core material. After spraying the stock solution to form a foamed synthetic resin of a required thickness, the foamed synthetic resin is formed using known means, such as removing the core material. A known reinforcing material such as a sheet, woven fabric, non-woven fabric, or braided material may be integrally bonded to the inner surface of the cylindrical piece-shaped synthetic resin foam 1 and further to the intermediate portion. By doing so, the strength and dimensional stability are improved, the density of the foamed synthetic resin can be lowered, and the manufacturing cost can be reduced. The shape of the abutting surfaces between the cylindrical foamed synthetic resins may be flat, but as shown in Figure 2, when the abutting surfaces in the circumferential direction and the axial direction are stepped surfaces, the abutting surfaces Useful for sealing effect.

The elastic sheet 2 used in this invention has a specific gravity of 0.02
It is preferably a plastic foam or foam rubber such as soft urethane foam, semi-hard urethane foam, or soft polyvinyl chloride foam with a thickness of 1 to 10 mm. Furthermore, this elastic sheet does not need to have self-adhesive strength;
The thin metal plate 3 and an appropriate adhesive 4 may be used to integrate the metal sheet 3 into one piece. In addition, these elastic sheets 2 generally absorb moisture,
Since it is water permeable, the thin metal plate 3 and the cylindrical foam 1
It is desirable to embed it so that it is surrounded by.

The thin metal plate 3 is used to protect the cylindrical foamed synthetic resin 1 from physical and chemical effects and to improve the aesthetics of the heat insulating device. Suitable materials include stainless steel plates, aluminum plates, and stainless steel plates.

The outer peripheral surface of the cylindrical piece-shaped foamed synthetic resin 1 is covered with a thin metal plate 3.
When constructing a heat insulating material for a pipe by completely covering the pipe with the elastic sheet 2, it is desirable that the ends of the elastic sheet 2 are not exposed, since the elastic sheet 2 generally absorbs moisture and permeates water. For example, when the metal thin plate 3 is brought into close contact with the entire ridgeline of the cylindrical piece-shaped foamed synthetic resin 1, the elastic sheet 2 is made smaller than the metal thin plate 3. Alternatively, only the thin metal plate 3, or the thin metal plate 3 and the elastic sheet 2 are made larger than the outer peripheral surface of the cylindrical foamed synthetic resin 1, and the side surfaces of the cylindrical foamed synthetic resin 1 are slightly covered. be combined into one. With this, pipe insulation material A
There is an advantage that foreign matter can be completely prevented from entering the elastic sheet 2 during handling such as transportation and insulation construction.

The pipe insulation material A according to this invention can be easily obtained by bonding a pre-formed cylindrical piece of foamed synthetic resin 1, an elastic sheet 2 and a thin metal plate 3 together using a reactive adhesive such as an epoxy or urethane adhesive on their respective joining surfaces, or by placing the thin metal plate 3 to which the elastic sheet 2 has already been adhered in a predetermined position in a known molding die, injecting a concentrate of self-adhesive foamed synthetic resin, closing the formwork and allowing it to foam and solidify.

When forming a heat insulating device for a cryogenic fluid transport pipe using the pipe heat insulating material A according to this invention, the pipe heat insulating material A is attached in a single layer on the outer peripheral surface of the pipe B, and the pipe heat insulating material A is formed in a single layer on the butt part 5 It can be formed in an extremely simple and streamlined process by thermally sealing the joints with foam adhesive, hard urethane foam injection, etc.

As mentioned above, in the pipe insulation material according to this invention, the thin metal plate used as a moisture-proof and exterior member is made of soft urethane foam, semi-hard urethane foam, soft vinyl chloride foam, foam rubber, or an elastic sheet of your choice. Since it is interposed and bonded to the cylindrical foamed synthetic resin into an integral structure by adhesion, the elastic sheet absorbs the decrease in the outer surface area due to low-temperature shrinkage of the foamed synthetic resin, making it effective for peeling from the thin metal plate. is prevented. Therefore, if the pipe insulation material of this invention is used, an ultra-low-temperature insulation device with extremely excellent performance can be formed in a single-layer structure in a streamlined process, so it has great construction and economical advantages in insulation work. It's large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of this invention, FIG. 2 is a perspective view showing another embodiment of this invention, and FIG. 3 is a perspective view of a heat insulating device using this invention. In the drawings, 1 is a cylindrical piece-shaped foamed synthetic resin, 2 is an elastic sheet, 3 is a thin metal plate, A is a heat insulating material for pipes, and B is piping.

Claims (1)

[Scope of utility model registration request] A cylindrical piece-shaped foamed synthetic resin for insulation is placed on the inside, and a thin metal plate for the exterior is placed on the outside. A heat insulating material for pipes, characterized in that it is integrally bonded with an elastic sheet selected from rubber as an intervening material.