JPS6156853B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting equipment storage container, particularly for storing equipment that is maintained at extremely low temperatures, such as superconducting coils, and is designed to prevent heat from entering from the outside. Regarding equipment storage containers.

It is important for superconducting equipment to be kept at extremely low temperatures in order to achieve the superconducting phenomenon, and it is necessary to minimize heat intrusion from the outside. However, due to the emphasis placed on heat intrusion, there was a tendency to not consider maintenance and inspection of the inside of containers such as superconducting equipment in the event of failures such as vacuum leaks.

FIG. 1 shows a schematic configuration of a conventional superconducting equipment storage container.

In the figure, superconducting equipment 1 such as superconducting coils
must be kept at an extremely low temperature of about 4〓, and the atmosphere needs to be about 300〓
The condition is that it heats up and cuts off. Superconducting equipment 1
is installed on a built-in base 2, placed on and fixed to a lower bottom plate 3. On the other hand, since it is necessary to reduce heat conduction, heat transfer, and heat radiation to the utmost in order to heat or cut off heat, a method of insulating the electrically conductive device 1 in vacuum is generally used.

For this reason, the vacuum container 4 that houses the superconducting equipment 1
In addition, in order to reduce radiant heat, a radiant heat shield plate 6 cooled with liquid nitrogen is provided inside the vacuum container 4, an upper shield plate 7 is provided above the radiant heat shield plate 6, and a lower shield plate is provided below the radiant heat shield plate 6. 8, and in order to further improve the radiation effect, a vacuum container 4
Film-shaped multilayer heat insulators 9 and 10 are disposed between the radiant heat shield plate 6 and the upper cover 5 and the upper shield plate 7, respectively. The shield 6 and the multilayer heat insulating body 9 are supported by the flange 11 from above.

However, in such conventional superconducting equipment storage containers, various measures have been taken to prevent heat intrusion from the outside, as described above, to minimize heat intrusion, but when performing maintenance and inspection inside the vacuum container 4, was very inconvenient. For example, when performing maintenance and inspection on a superconducting device 1 such as a superconducting coil, in the conventional structure, the top cover 5 is opened and taken out, but this work is very inconvenient, and especially when the device becomes large, the vacuum container 4 is removed. The height dimension became large, and the pull-out dimension of the superconducting device 1 became high, making maintenance and inspection inside the vacuum container 4 extremely troublesome.

The present invention has been made in view of the above-mentioned points, and an object thereof is to provide a superconducting equipment storage container whose interior can be easily maintained and inspected even when the device is increased in size.

The present invention includes a vacuum container that houses superconducting equipment that is maintained at an extremely low temperature and is thermally isolated from the outside, and a radiant heat shield that surrounds the superconducting equipment with an appropriate spacing within the vacuum container. The intended purpose is achieved by dividing each board into a plurality of parts.

The present invention will be described in detail below based on embodiments shown in the drawings. Incidentally, the same reference numerals are used for the same parts as in the past.

FIG. 2 shows an embodiment of the superconducting equipment storage container of the present invention, and FIG. 3 is an enlarged detailed view of part A thereof.

In this figure, since the method of supporting the superconducting device 1 is completely the same as the conventional method, the explanation here will be omitted. In this example, the vacuum container housing these superconducting devices 1 is divided into multiple parts (in this example, it is divided into three parts).
and a lower vacuum container 12 and a middle vacuum container 1, respectively.
3 and an upper vacuum container 14 which also serves as an upper lid, and the divided portions thereof are vacuum sealed to maintain the interior in a vacuum state. On the other hand, the radiant heat shield plate placed in the vacuum vessel and surrounding the superconducting equipment 1 to cut off radiant heat is also divided corresponding to the vacuum vessel division portion, and is divided into a lower shield plate 15, a middle shield plate 16, and a lower shield plate 16, respectively. and an upper shield plate. A cooling pipe (not shown) through which liquid nitrogen flows is wound and fixed to each shield plate. A multilayer insulator made of multiple layers of film is provided between each shield plate and the vacuum container to further increase the cold insulation effect, but in this example, this multilayer insulator is also divided, and the lower layer Insulator 18, middle multilayer insulator 1
9 and an upper multilayer heat insulating body 20, which are attached to each shield plate.

Using Figure 3, vacuum container, radiant heat shield plate,
and the divided portions of the multilayer heat insulating body will be explained.

This figure shows part A in Fig. 2, that is, a state in which the upper and lower stages are connected, and the divided part of the middle vacuum vessel 13 is provided with a flange 21, and the upper vacuum vessel 14 is provided with a flange 22. A gasket 23 is interposed on the surface, and then the bolts 24 and nuts 25 are tightened to form a vacuum seal, and the interiors 26 and 27 are maintained in a vacuum state. Eaves 32 are provided on the middle shield plate 16 so that the ends of the divided parts of the middle shield plate 16 and the upper shield plate 17 are staggered to prevent heat from directly penetrating into the radiation shield plate as shown by arrow a. . Furthermore, a hanging fitting 28 is fixed to the inner wall of the middle vacuum vessel 13, and a hanging fitting 29 is also fixed to the middle shield plate 16, so that the middle shield plate 16 is supported by the middle vacuum vessel 13 by a hanging rod 30. Numeral 31 is a nut provided on the hanging rod 30 to prevent displacement. Multilayer heat insulators 19 and 20 are attached to the outer peripheries of the divided middle and upper shield plates 16 and 17 as shown. Although not specifically explained, Fig. 2A
The other division parts have the same structure as described above.

By having the configuration of this embodiment as described above,
For example, if you want to perform maintenance and inspection on the superconducting equipment 1, even if the equipment becomes larger, you can easily do it by removing the divided parts of the vacuum container, and each shield plate 15, 16, 17 Since the shield plates are attached to the containers 12, 13, and 14, and there is no need to disassemble the shield plate when disassembling the vacuum container, it is economical because the trouble of disassembling for maintenance is saved. Further, even if the radiant heat shield plate is divided, since the eaves portions 32 are provided so that the divided portions are alternated, heat does not directly enter the inside of the radiant heat shield plate, and the heat insulation effect is not impaired.

According to the superconducting equipment storage container of the present invention described above, the vacuum container houses the superconducting equipment maintained at an extremely low temperature and is thermally disconnected from the outside;
Since the radiant heat shield plate surrounding the superconducting equipment is divided into a plurality of parts at appropriate intervals within the vacuum container, it is possible to perform maintenance and inspection on the inside even if the equipment becomes large. This can be easily done by simply removing the dividing part, and is very effective when used in a type container.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a conventional superconducting equipment storage container, FIG. 2 is a longitudinal sectional view showing an embodiment of the superconducting equipment storage container of the present invention, and FIG. 3 is a detailed sectional view of part A in FIG. 2. It is. 1... Superconducting equipment, 4... Vacuum container, 6... Radiant heat shield plate, 9... Multilayer insulation body, 12... Lower vacuum container, 13... Middle vacuum container, 14... Upper vacuum container, 15... Lower shield plate, 16...
Middle shield plate, 17... Upper shield plate, 18
... lower stage multilayer insulation body, 19 ... middle stage multilayer insulation body,
20...Upper multilayer insulation body, 28, 29...Mounting metal fittings, 30...Hanging rod, 32...Eave portion.

Claims (1)

[Claims] 1. A vacuum container that houses superconducting equipment maintained at a cryogenic temperature and is thermally isolated from the outside;
A superconducting equipment storage container comprising a radiant heat shield plate surrounding the superconducting equipment at an appropriate interval within the vacuum container, wherein the vacuum container and the radiant heat shield plate are each divided into a plurality of parts. . 2. The device according to claim 1, characterized in that a sealing material is interposed between the divided portions of the vacuum container to vacuum-seal the divided portions, and the divided ends of the radiant heat shield plates are arranged alternately. Superconducting equipment storage container. 3. The superconducting equipment storage container according to claim 2, characterized in that a multilayer insulator is provided between the vacuum container and the radiant heat shield plate, and the multilayer insulator is arranged along the radiant heat shield plate. . 4. The superconducting equipment storage container according to claim 1, wherein each of the divided radiant heat shield plates is attached to an inner wall of the vacuum container.