JPS584235B2 - Suichiyokuhai Kanno Dannetsuzai - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tubular insulation material for use in multiple piping, particularly vertical piping, through which high-temperature, high-pressure fluids flow.

An object of the present invention is to prevent the face metal from being excessively stretched when the above type of heat insulating material expands thermally, thereby creating pockets where no heat insulating material is filled.

The structure of the multiple piping for high-temperature, high-pressure fluid used in nuclear power plants, etc. has an inner wall pipe in the center serving as a heat-resistant boundary through which high-temperature, high-pressure fluid flows, the outer periphery of the inner wall pipe is covered with a heat insulating material, and the outermost periphery is covered with a heat insulating material. There is a pressure pipe as a pressure boundary.

The pressure tube and the insulation material are filled with fluid so that the pressure tube functions as a pressure boundary, thus maintaining a hydrostatic pressure balance throughout the tube.

The heat insulating material is effective in suppressing the temperature rise in the pressure pipe to below a certain limit.

When using irregularly shaped fireproof insulation fibers as insulation materials,
The face metal is an essential component in maintaining its fixed shape.

Incidentally, in a high-temperature atmosphere, even heat insulating materials undergo thermal expansion without exception.

However, there is a significant difference in thermal expansion between the refractory insulation fibers and the face metal, and especially in the case of vertical piping, a pocket where no refractory insulation fibers are present may be created above the elongated face metal.

In the pocket portion, the heat insulation effect is lost, and the effect of suppressing the temperature rise of the pressure pipe cannot be expected.

On the other hand, it is recognized that it is necessary to take appropriate measures against the phenomenon that heat transfer becomes active due to natural convection of the fluid filled in the insulation material, and the insulation properties deteriorate.

The present invention has the following features as a means of achieving the original objectives and solving the problems of the prior art.

First of all, a plurality of partition plates are used to prevent convection of the fluid filling inside the insulation.

Fireproof insulation fibers serving as a heat insulating material are densely packed into each of the compartments partitioned by the partition plates.

Second, in order to minimize the occurrence of pockets due to extreme thermal expansion of the face metal, a support is lowered from the top of the insulation material, and each of the partition plates is individually attached to this support to form the partition plates and filling insulation. The material was supported in each section with a moderate degree of freedom.

Next, the present invention will be explained with reference to the embodiments illustrated in FIGS. 1 to 4.

FIG. 1 shows important points in the assembly process of the heat insulating material according to the invention.

First, one unit of the heat insulating material 2 is filled into the deepest part of a face metal having a concentric double wall structure having a hollow part in the center through which an inner wall pipe passes, and then the partition plate 1 is attached through the support 7.

The support body 7 is equipped with a support mechanism 3 like a non-return hook that can be opened and closed like a pin hinge at desired spacing. This is possible by being able to do so.

In this way, the insulation material 2 and the partition plate 1 are sequentially and alternately filled,
Finally, the assembly work is completed by joining the face metal 8 corresponding to the top wall to the upper end of the support 7 (Figure 2). Let it be used.

By turning the top and bottom upside down in this way, the support mechanism 3 opens and becomes ready to perform a non-return function, making it possible to place and support the partition plates 1 one by one on each stage of the support mechanism 3. Become.

Although the surface of this heat insulating material is covered with face metals 4, 5, 6, and 8, and a plurality of partition plates 1 are present at appropriate intervals therein, fluid can easily penetrate and cover the entire area. This structure maintains a static balance of fluid pressure.

The materials, arrangement, number, etc. of the support body 7 and the partition plate 1 will be designed depending on the specifications of the piping, the intended use, and the usage conditions.

As the heat insulating material 2 to be filled, an amorphous fireproof heat insulating fiber, more specifically, a mixture fiber of alumina and silica such as Kao Wool and Fine Flex (both trade names) is used.

As described above, according to the present invention, a plurality of partition plates are installed at appropriate intervals to prevent convection of fluid filled in the heat insulating material, and the partition plates are installed at desired intervals in the middle of the support. Even if the face metal were to be significantly elongated due to thermal expansion, the spacing between the partition plates suspended by the supports would follow the thermal expansion and maintain the same spacing.

Therefore, the volume of the insulating fibers supported by the partition plate is not maintained almost uniformly, and the face metal is depressed relative to the elongated face metal as in the conventional case, resulting in pockets lacking in insulating material. There is no such fear.

Further, according to the present invention, since the convection of the internally filled fluid is well prevented by the partition plate, a thermal insulating material for vertical piping with excellent heat insulation properties is provided, which in turn improves the safety and reliability of piping for high-temperature and high-pressure fluids. This contributes to improvement.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the state of assembling the heat insulating material, Fig. 2 is an explanatory diagram of the completed assembling of the heat insulating material, and Figs. 3 and 4 represent an embodiment of the heat insulating material according to the present invention. , FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. 4, and FIG. 4 is a cross-sectional view taken along the line ■-■ in FIG.

Claims (1)

[Claims] 1 Insulating material for vertical piping, in which partition walls are attached almost horizontally at regular intervals to supports fixed to the upper and lower surfaces of the face metal, and the space inside the face metal is densely filled with insulating material.