JPS5899598A - Metal coated heat insulating material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides metal-coated insulation materials, particularly atomic couplant piping,
The present invention relates to a metal-coated heat insulating material suitable for use in equipment, and aims to provide a low-cost heat insulating material, as well as a metal-coated heat insulating material that is lightweight and has high heat insulating properties.

In nuclear power plants, all piping and equipment must be periodically inspected after the plant is commissioned, and insulation materials must be removed from the inspection areas and restored. In this case, the amount of radiation exposure is regulated for workers, making it impossible for them to work for long periods of time.Therefore, there is a need for heat insulating materials that are easy to remove and store.

Also, was the heat insulating material used during the above inspection radioactive? Is there any need to decontaminate water, such as decontamination? What is needed is an insulation material that can be easily applied using impregnated cloth and that can be reused without altering the patent.

In the past, metal insulation materials made of metal were generally used for this purpose, but these had drawbacks such as being extremely heavy and having extremely low insulation properties. . In addition, it is easily deformed by external force, and in order to prevent this, it is necessary to use a metal plate with a thickness of 0.7 to 0.8 mm or more. Department? The heat transmitted and escaping is extremely strong, and the weight of expensive metal used is also high, leading to disadvantages such as high cost.

In addition, heat insulating materials have been proposed in which the surface of fibrous heat insulating materials such as glass fiber and asbestos is covered with metal plates, but since fibrous heat insulating materials have low compressive strength, they are easily deformed by external forces. For complete prevention, thickness 0.7M~0
．． It is necessary to use all the metal plates of about 8# or higher, and over a long period of time, the fibrous insulation material will settle due to its own weight.
It also had the disadvantage that it was extremely difficult to maintain the required heat insulation thickness, and it was not suitable for use in a room.

As described above, the conventional metal-coated heat insulating materials have much poorer insulation performance than expected due to the use of thick metal panels, and improvements are desired.

The present invention is based on these nine wishes, and is based on Pi.
The present invention is a heat insulating material in which the surface th of a calcium silicate molded body is coated with a metal plate, and the thickness of the metal plate parallel to the hot surface of the object to be coated is also the same as that of the hot blood. The thickness of the straight metal plate is smaller, and the thickness of the latter metal plate is 0.
The present invention relates to a metal-coated heat insulating material characterized by having a fi of 4fi or less.

The calcium silicate molded body used in the present invention is mainly composed of a calcium silicate compound such as tobermolite crystal, alumina-containing tobermolite crystal, sheet 7 trite crystal, C3H(I), casing, or a mixture thereof. A molded body in the shape of a plate, semi-cylindrical, etc., to which additives such as clay, glass fiber, and cement are added as necessary, and in particular has a density of 0.2 and is mainly composed of sheet dried crystals.
2~0.08p/! It is preferable to use a molded product with a density of about 0.
Light N of about 13 to 0.08 p/m is most preferable.

In addition, as a metal plate covering the calcium silicate molded body,
Various materials can be used, but stainless steel is most commonly used, and as a metal plate parallel to the hot blood of the object to be coated (for example, in the case of piping, the outer circumferential surface of the piping). 5. The metal plate with a wall thickness of around 0.4 to 0.1 a is a metal plate perpendicular to the heating surface of the casing. used.

The metal-coated heat insulating material of the present invention is made by covering the surface of a calcium silicate molded body with a gold plate, and since the molded body has a higher compressive strength than a fibrous material etc., the thickness of the metal plate covered with the molded body is large. The mechanical strength of the insulation material is high even with a small size, it does not deform due to external force, and the amount of expensive and heavy metal used can be reduced, making it an inexpensive and highly insulating material overall. In addition, it is lightweight, making it easy to attach and detach during periodic inspections, and enables inspection and restoration in a short period of time. In particular, since the thickness of the metal plates at the contact portions of the heat insulating materials (metal plates perpendicular to the heating surface) is completely reduced, heat loss due to the formation of thermal bridges is reduced. So〈
According to the EJVc, it is possible to provide this type of product with high performance, high strength, light weight, and low cost. Unexploded items are lightweight and easy to put on and take off, and because of their structure, decontamination work can be easily carried out using a cloth soaked in water. It is extremely useful when applied to the insulation coating of piping and equipment for special VC atomic couplants.

The whole aspect of the present invention will be explained below based on the accompanying drawings.

The drawing shows an example of the metal-coated heat insulating material of the present invention used for heat-insulating coating of pipe (7), and is formed into a semi-cylindrical shape to facilitate attachment to pipe (7) K.

To describe an example of manufacturing such a semi-cylindrical metal-coated heat insulating material, as shown in Figs. 1 and 3, the surface metal plate (1) (metal plate parallel to the hot surface) is constructed 0, 5
Attach the spacer (4) and buckle (5) to the specified locations on a thick stainless steel plate (SUS, 304) as usual.
5), Locking metal fitting (6) (6) Overlap plate (8) After attaching by applying full welding method etc., it is bent to form a semi-cylindrical shape, and then a contact part is placed on one side of the plate. The metal plate (2) (metal plate perpendicular to the hot surface) is housed using the same welding method, and is formed into a 10-yen ball vJw-shaped body. Insert the calcium silicate molded body (3) (ff1 degree 0.13 y/m) whose main component is sheet dry crystal into the molded body [7k, and then weld the other contact metal plate (2) to the other side of the molded body (3). The product of the present invention can be obtained by applying means or the like.

The products of the present invention thus obtained are placed in pairs on the outer circumferential surface of the pipe (7) as a pair of upper and lower parts, as shown in FIGS. 2 and 3. Buckles (5) (6) and locking metal fittings (6) provided on this <6>
They are connected by a connecting fitting consisting of. By opening this connecting fitting, these items can be easily removed from the pipe (7).

As is clear from FIG. 2, in the case of a heat insulating coating [iVc, the contact metal plate (2) does not have a heat insulating material, so heat escapes through this part, but in the present invention, Since the thickness of this contact metal plate (2) is made small, the amount of grazing heat can be reduced accordingly, and the heat loss can be completely reduced.

In order to understand the heat insulation properties of the inventive product and the comparative product, a metal-coated heat insulating material with a thickness of 100 mm was prepared in the same manner as in the example of the present invention, except that the thickness of the surface metal plate was changed as shown in Table 1, and a conventional product was used. Table 1 shows the results of measuring the amount of heat dissipated from the surface of the width retaining material for the metal heat insulating material of the laminated metal plate type.

The measurements were carried out at the following points by placing a plurality of upper and lower pairs of semi-cylindrical heat insulators in series with a VC in the piping, maintaining the internal hot water temperature at 300°C.

E Contact area in the longitudinal direction of the semi-cylindrical heat insulating material = Central part of the semi-cylindrical heat insulating material Bar Contact area in the circumferential direction of the semi-cylindrical heat insulating material The amount of heat dissipated on the surface of the heat insulating material is Showa Denko K.K. HF M-
Measurement was carried out using a MU' type thermal needle flow meter.

=7- Table 1 (AI-bu-2 is a comparative example) As shown in Table 1, the product of the present invention has a smaller amount of grazing heat than the comparative product, and its excellent performance is guaranteed. The metal-coated heat insulating material is not limited to the semi-cylindrical shape shown in the drawings, but may be formed into other shapes such as a flat plate so that it can be attached along the hot surface of the object to be coated.

8-

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view showing one embodiment of the present invention, and FIG.
This figure is a longitudinal cross-sectional view showing one usage situation of the product of the present invention shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line A-Ai in FIG. 2. In the figure, (1) is a surface metal plate, (2) is a contact portion metal plate, and (3) is a calcium silicate molded body. [Above] ゛). Agent: Patent attorney Eiji Saegusa, □・4. ,
, ”, -4, Kusho Figure 1 6 Figure 2 Figure 3 7 2 Commissioner of the Patent Office Kazuo Wakasugi 1. Indication of the case 1981 Patent Application No. 195374 3. Person making the amendment Relationship with the case Patent Applicant Co., Ltd. Osaka Para Gyunk Manufacturing Co., Ltd. 4, Agent, Heiwa Building, 2-10 Hirano-cho, Higashi-ku, Osaka Telephone: 06-203
-0941 (act) 8, contents of the amendment as attached, page 6, line 10 to page 17, line 7, ``such...
·········can get. ” has been corrected in the following text. "The metal covering part of the semi-cylindrical metal-coated heat insulating material of the present invention consists of inner and outer surface metal plates (1) (1) parallel to the heating surface, and a circumferential contact metal plate (2) perpendicular to the heating surface. ) (2) and a longitudinal contact metal plate (2) (2) perpendicular to the isothermal surface, where the surface metal plate (1) (1) is a 0.5 fl thick stainless steel plate ( The contact metal plates (2) (2), (2) (da) are each made of stainless steel plate <5rys, 304) with a thickness of 0.3, and are made of 2nd grade metal plate. They are joined together at the connection by the application of welding means.The inner surface metal plate (1) is provided with a spacer (4) and the outer surface metal plate (1) is provided with a spacer (4). , buckle (5) (5), locking metal fitting (6)
(6) and the overlapping plate (8) are fixed by welding. Calcium silicate molded body (3) shaped into a semi-cylindrical shape and mainly composed of mononotrite crystals (density 0.13 f/d)
is coated with such a metal coating. Molded object (
3) is, for example, a metal plate (1) (1), (2) (2)
(2) (2) In the middle of assembling the semi-cylindrical box-shaped metal covering part, the contact part metal plate (2) (2) in the circumferential direction
) or before installing the longitudinal contact metal plate (2) (ri), insert it between the inner and outer surface thin metal plates (1) (1) through the opening of this unattached part, Next, this opening provides a semi-cylindrical product of the present invention. ”
2. The description of the description will be corrected using the following errata. 2-3 Correct the attached circular for Figure 3 of the drawing. (Above) 3-3 503-1 G to δ M

Claims (1)

[Claims] ■ A heat insulating material made by covering the surface of a calcium silicate molded body with a metal plate. B The thickness of the metal plate perpendicular to the hot surface of the object to be treated is smaller than the thickness of the metal plate parallel to the hot blood of the object to be treated, and the thickness of the latter metal plate is 0.4W or less. Coated insulation material.