JPS638635B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum insulation container for superconducting, and particularly for storing superconducting equipment such as superconducting coils, maintaining it at an extremely low temperature and thermally disconnecting it from the outside. Regarding vacuum insulated 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 general superconducting vacuum insulation container used in a superconducting device.

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 thermal radiation to the utmost in order to heat the superconducting device 1, a method is generally used in which the superconducting equipment 1 is made vacuum insulated.

For this reason, the vacuum container 4 that houses the superconducting equipment 1
In addition, in order to reduce heat radiation, a radiation heat shield plate 6 cooled with liquid nitrogen is provided inside the vacuum container 4, and an upper shield plate 7 is placed above it.
A lower shield plate 8 is provided on the lower side, and in order to further improve the radiation effect, a film is placed between the vacuum container 4 and the radiation heat shield plate 6 and between the upper lid 5 and the upper shield plate 7. Multilayer heat insulating bodies 9 and 10 are arranged, respectively. The shield 6 and the multilayer heat insulating body 9 are supported by the flange 11 from above.

However, in such a superconducting vacuum insulated container, various measures have been taken to prevent heat intrusion from the outside as described above, and although the intrusion is minimized, it is very difficult to maintain and inspect the inside of the vacuum container 4. It was inconvenient. For example, when performing maintenance and inspection on a superconducting device 1 such as a superconducting coil, the top cover 5 is opened and taken out, but this work is very inconvenient, and especially as the device becomes larger, the height of the vacuum container 3 increases. Then,
Since the drawer dimension of the superconducting device 1 is increased, maintenance and inspection inside the vacuum container 4 is extremely troublesome.

For this reason, it is known that a vacuum insulation container for superconducting is divided horizontally (up and down). This is shown in FIG.

What is shown in the figure is that the vacuum insulation container housing the superconducting equipment 1 is horizontally divided into three parts, each of which is a lower vacuum container 12, a middle vacuum container 13, and an upper vacuum container 14 that also serves as an upper lid. The radiation heat shield plate that surrounds the superconducting equipment 1 to shield and maintain the interior in a vacuum state and to cut off radiation heat is also divided corresponding to the vacuum vessel division portion, and is divided into lower shield plates 15 and 15, respectively. , a middle shield plate 16, and an upper shield plate 17, which together constitute a superconducting vacuum insulation container.

According to this configuration, for example, when it is desired to perform maintenance and inspection on the superconducting equipment 1, even if the device becomes larger, it can be easily performed by removing each divided portion of the vacuum insulation container, and assembly after maintenance and inspection is also easy. .

It is sufficient for vacuum insulated containers used in normal superconducting devices to be vacuum shielded and easy to assemble and disassemble. Due to the high magnetic field generated by the coil or the magnetic field from other coils, induced power is generated in various parts of the vacuum insulation container due to vertical and horizontal magnetic flux components, and if the induced current flows to areas other than necessary, it will become charged. Not only is this dangerous, but it also reduces the high magnetic field and degrades performance, so it is required not to form one electrical turn.

However, in a vacuum insulated container for superconducting as described above, which is divided horizontally, one electrical turn is formed and cannot be used as a vacuum insulated container for a torus-shaped fusion device.

On the other hand, a plasma storage vacuum vessel for a nuclear fusion device is known in which one electrical turn is not formed by dividing only the vertical direction and insulating the divided portions. However, the plasma storage vacuum vessel for a nuclear fusion device is vertically divided to interpose an insulator to prevent the formation of one electrical turn, and no special consideration is taken during assembly and disassembly. Since no superconducting equipment is housed, there is no need for maintenance and inspection of these equipment. Therefore, it is difficult to assemble and disassemble the plasma storage vacuum vessel for the fusion device, which is divided vertically, and internal maintenance is easy. Inspection is not possible.

The present invention has been made in view of the above points, and its purpose is to facilitate assembly and disassembly and reduce internal maintenance points even when housing superconducting equipment maintained at extremely low temperatures. We have created a vacuum insulated container for superconductors that is easy to perform, prevents the formation of one electrical turn even if induced current is generated in each part of the container due to vertical and horizontal magnetic flux components, and can be sealed in a high vacuum. It is on offer.

In the present invention, a vacuum insulated container is divided horizontally and vertically, a continuous flange is formed at the end of each divided container, and these flange parts are joined with a gasket and an insulator interposed therebetween. , the horizontal joint and the vertical joint are integrally constructed so that the intersection is cross-shaped, and the gasket interposed in the vertical joint is formed to have a U-shaped cross section, and an insulator is provided between them. a part of the joint between the vertical gasket and the gasket interposed in the horizontal joint of the vertical gasket is tapered;
The vertical gasket is wedged into the horizontal gasket through this tapered portion when each divided container is tightened, so that the intended purpose is achieved.

The present invention will be described below based on embodiments shown in the drawings.

FIG. 3 shows an embodiment of the vacuum insulation container for superconducting according to the present invention.

As shown in the figure, in this embodiment, the vacuum insulation container is divided into horizontal and vertical directions, and an insulator is interposed between each divided portion to provide electrical insulation.

That is, the lower container 21 is placed on the floor, the middle container 22 is placed above the lower container 21, and the upper container 23 is placed above it. 2 more
The middle container 22 is divided into divided containers 21a and 21b, and the upper container 23 is divided into divided containers 23a and 23b.A flange portion 24 is provided at the joint of each of these divided containers. Insulating plates 25, 2 between the flanges 24 of each divided container
6, 27, 28, and 29 are interposed therebetween, and finally they are fastened with bolts 30 or the like, so that the horizontal joint portion and the vertical joint portion are integrally constructed so that the intersection portion is cross-shaped. Details between the divided container flanges in the upper configuration are shown in FIG.

In the figure, 31a and 31b are the lower container 21.
Similarly, 32a and 32b indicate the flange portions of the middle container 22. As shown in the figure, horizontal gaskets 43, 44 and an insulating plate 47 are interposed horizontally between the flanges 31a, 31b and 32a, 32b, and the lower containers 31a and 31b and the middle containers 32a and 32b are separated. Gaskets 45, 46 and insulating plates 48, 49 are interposed in the vertical direction between them to provide vacuum sealing and electrical insulation.

In this embodiment, the vertical gaskets 45 and 46 interposed between the flanges 31a and 31b and between 32a and 32b have a U-shaped cross section, and insulating plates 48 and 49 are inserted between them. is,
In addition, a part of the joint between the horizontal gaskets 43 and 44 has a tapered shape, and when tightened, the tips of the vertical gaskets 45 and 46 sink into the horizontal gaskets 43 and 44, making a close contact and creating a vacuum seal. There is.

By having the configuration of this embodiment as described above,
Because it is divided horizontally and vertically,
Maintenance and inspection of internal superconducting coils, etc. can be easily carried out by disassembling the divided parts, and the divided container is designed such that no single electrical turn is formed in the circumferential direction via an insulating plate. , there is no particular problem when it is adopted in a nuclear fusion device.

Furthermore, by tightening the divided containers in the horizontal direction, the gaskets 45 and 46 are compressed in cross-section and simultaneously expanded in the longitudinal direction (in the vertical direction in the figure). Further, the insulating plate is compressed in the thickness direction (horizontal direction in the figure) by tightening in the vertical direction, and simultaneously expands in the thickness direction. Due to this expansion in two directions, the minute hole that had occurred at the joint part c in Figure 4 is filled up, making it possible to perform a high-vacuum seal.

In addition, Fig. 5 shows the flange connection shown in Fig. 4.
This is a sectional view taken along arrow B, showing the insulating plate and gasket being tightened with insulated bolts 50, insulating washers 51, washers 52, and nuts 53.

Figure 6 shows a modification of the vacuum seal structure.
The principle of vacuum sealing direction is the same as that shown in FIG. In this modification, the horizontal gaskets 54 and 55 are discontinuous at the vertical direction and the boundary, two layers of insulating plates 57 and 58 are provided horizontally, and a continuous horizontal gasket is provided between the insulating plates 57 and 58. direction gasket 5
6 is interposed between the lower container 2 and the lower container 2. Of course, this structure also has the same vacuum sealing effect as described above, and also allows the lower container 2 to be removed without disassembling the tapered part c.
1 and the middle container 22 can be separated, making it easier to disassemble and assemble the superconducting coils and the like stored therein for maintenance and inspection. That is,
FIG. 7 shows a sectional view taken along line D-D in FIG. 6, and bolts 59 and 60 are connected to insulating plate 57 and 58 is fastened to the flange portion. The gasket 56 is tightened by shifting the bolt holes in the flange portion to form a vacuum seal as shown in FIG.

According to the vacuum insulated container for superconducting of the present invention as described above, the vacuum insulated container is divided into horizontal and vertical directions, continuous flange portions are formed at the ends of the divided portions of each divided container, and the flange portions are connected to each other. are joined to a gasket with an insulator interposed between them, and are integrally constructed so that the intersection of the horizontal joint and the vertical joint has a cross shape, and the gasket interposed in the vertical joint is The gasket is formed into a U-shaped cross section and an insulator is disposed therebetween, and a part of the joint with the gasket interposed in the horizontal joint of the vertical gasket is tapered. When each divided container is tightened, the vertical gasket is screwed into the horizontal gasket and is in close contact with the divided container. Therefore, it is easy to assemble and disassemble the container, and the internal maintenance and inspection can be easily performed. Due to the magnetic flux component, even if an induced current is generated in each part of the container, one electrical turn will not be formed.Furthermore, the minute holes that had occurred at the joints will be filled, making it possible to create a high vacuum seal, which will prevent the fusion device from forming a single electrical turn. It is very effective when used in applications such as

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal sectional views showing general vacuum insulation containers used in superconducting equipment, and Figure 3
The figure is a perspective view showing one embodiment of the superconducting vacuum insulation container of the present invention, FIG. 4 is a cross-sectional view of the flange portion of the divided container, FIG. The figure is a sectional view showing another example of the vacuum seal at the flange portion of the divided container, and FIG. 7 is a sectional view taken along line DD in FIG. 6. 21...lower container, 22...middle container, 23...
...Upper container, 24, 31a, 31b, 32a, 3
2b...flange part, 25, 26, 27, 28,
29, 47, 48, 49, 57, 58... Insulating plate, 43, 44, 45, 46, 54, 55, 56
...Gasket.

Claims (1)

[Claims] 1. In a superconducting vacuum insulated container that houses superconducting equipment that is maintained at an extremely low temperature and that maintains a vacuum inside and is thermally insulated from the outside, the vacuum insulated container is divided into a horizontal direction and a vertical direction, A continuous flange is formed at the end of the divided portion of each of these divided containers, and these flange portions are joined with a gasket and an insulator interposed, and the intersection of the horizontal joint and the vertical joint is a cross. The gasket interposed in the vertical joint part is formed into a U-shaped cross section, and an insulator is disposed therebetween, and the horizontal joint part of the vertical gasket is A superconductor characterized in that a part of the joint with the intervening gasket has a tapered shape, and the vertical gasket is wedged into the horizontal gasket through this tapered part when each divided container is tightened and is tightly attached to the horizontal gasket. vacuum insulated container.