JP2503475Y2 - Helium container for superconducting coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a helium container for a superconducting coil applied to a toroidal superconducting coil.

[Conventional technology]

The superconducting coil container is filled with liquid helium and has a built-in coil in order to maintain the superconducting coil at the cryogenic temperature necessary for maintaining its performance. The superconducting coil container is composed of a helium container and a vacuum container on the outside thereof.

FIG. 6 shows a conventional general helium container. However, since the outer periphery of the helium container 11 in the vacuum container 12 is in a vacuum state, an internal pressure equivalent to the atmospheric pressure acts, and the inside of the helium container 11 is Since the thermal stress due to the temperature difference on the outside acts, the container is integrated and simplified as much as possible, the number of joints is reduced, and the structure prevents damage due to stress concentration and leakage of liquid helium 3 into the vacuum. The object to be cooled 15 is inserted from the upper flange 14 side. 7 and 8 are structural examples of fiber-reinforced plastic helium containers 11a and 11b for the toroidal coils 16a and 16b.
In the figure, the U-shape is used to reduce the required amount of liquid helium 3.

[Problems to be solved by the invention] For helium containers for superconducting coils, fiber reinforced plastics, which are excellent in terms of heat insulation, electrical insulation, non-magnetic properties, etc., are suitable for use. Since welding sealing cannot be performed, it is difficult to maintain the helium leak resistance, and it is unavoidable to take a structural form such as elimination of the joint portion by integral molding and flange joint method at the gas helium portion.

The conventional cylindrical type shown in FIG. 6 has a lot of wasted space for storing the toroidal coil.
Due to the complexity of the W and U types shown in Fig. 8, the hand layup has low reliability in terms of strength and helium leak resistance, and pressure molding results in high die costs. Also,
When arranging multiple toroidal coils in a torus shape,
Since the toroidal coil must be placed vertically as shown in FIG. 6, liquid helium will be immersed in the flange joint surface, and reliability will be lost in terms of helium leak resistance. As a reliable joining method for helium leak resistance, there is a screw bonding method that uses both screw and bonding, but it is difficult to adopt it in the structure shown in Figs.

In order to solve the above problems, the present invention uses a cylindrical material by filament winding and a hollow disk made of a press-formed plate material, which are highly reliable with respect to helium leak resistance, as a material, and is configured by screw bonding, which is a low cost helium leak resistant material. The present invention aims to provide a helium container having a high reliability and a structure that fits toroidal coil shape, and has a technical feature in the assembling method and securing the reliability of the screw bonding portion.

[Means for solving the problem]

The helium container for a superconducting coil of the present invention has an outer peripheral cylinder having an inner peripheral surface threaded, an inner peripheral cylinder provided inside the outer peripheral cylinder with a threaded outer peripheral surface, and inner and outer peripheral end surfaces. Two hollow circular plates having a fillet shape are provided at the outer peripheral end of the inner peripheral cylinder and the outer peripheral cylinder that are threaded and screwed into both ends of the inner peripheral cylinder and the outer peripheral cylinder to form a closed space between the inner peripheral cylinder and the outer peripheral cylinder. It is characterized by that.

[Action]

In the above, the container of the present invention is assembled by screwing one hollow disc into one end of the inner peripheral cylinder, disposing the toroidal coil, and then screwing the other hollow disc into each hollow disc. An outer peripheral cylinder is screwed onto the outer peripheral end of the disk, and liquid helium is filled inside to complete the assembly.

In the present invention, when manufacturing a hollow donut type container that was in the shape of a toroidal coil, the whole was not integrally processed, but it was inexpensive and easy to manufacture by using reliable screw bonding for helium leak resistance. It is possible to improve the strength and reliability of helium leak by providing a fillet shape on the disk end surface of the screw bonded portion.

From the above, a helium container with a simple structure, high reliability against helium leak resistance, and low cost was realized.

〔Example〕

 One embodiment of the present invention is shown in FIGS.

The present embodiment shown in FIG. 1 and FIG. 2 has an outer peripheral cylinder 8 whose inner peripheral surface is threaded 17, and an inner peripheral surface which is provided inside the outer peripheral cylinder 8 and whose outer peripheral surface is threaded 17. The hollow cylinder 9 is provided with a cylinder 7 and inner and outer peripheral end faces which are threaded 17 and are threadedly engaged with both ends of the inner peripheral cylinder 7 and the outer peripheral cylinder 8, respectively, and whose inner and outer peripheral ends are fillet-shaped 18.

The assembly of the above-mentioned embodiment is shown in FIGS. 3 (a), (b),
As shown in (c), first, one hollow disk 9a is screwed into one end of the inner cylinder 7 to dispose the toroidal coil 6, and then the other hollow disk 9 is attached to the inner cylinder 7. The outer cylinder 8 is screwed to the other end, and then the outer cylinder 8 is screwed to the outer end of each of the hollow disks 9 and 9a, and liquid helium 3 is filled in the inside to complete the assembly. At the time of screwing the screw portion, an adhesive is applied in advance and screwed.

In the above, after assembling the two hollow discs 9 and 9a and the inner peripheral cylinder 7 and then screwing the outer peripheral cylinder 8, as a helium container for a toroidal type superconducting coil, a container with high reliability against helium leaks. Can be configured. Further, as shown in FIG. 4, by forming the inner and outer peripheral ends of the hollow discs 9 and 9a into a fillet shape 18, the stress concentration on the inner surface of the joint portion caused by the moment 13 at the time of internal pressure action is reduced, and the adhesive is peeled off. To prevent the occurrence of. Further, the fillet shape 18 has a secondary effect that the tip portion can be minutely deformed when the outer peripheral cylinder 8 is screwed in and the assembly is facilitated.

By the above, a helium container having a simple structure, high reliability against helium leak resistance, and low cost is realized.

[Effect of device]

In the helium container for superconducting coils of the present invention, hollow disks are screwed to the outer circumferences of both ends of the inner cylinder, and outer cylinders are screwed to the outer ends of the hollow disks. We have realized a low-cost helium container with a simple structure, high reliability for helium leaks.

[Brief description of drawings]

FIG. 1 is an explanatory view of a helium container according to an embodiment of the present invention, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIG. 3 is an assembly procedure diagram of the helium container according to the above embodiment. FIG. 4 is an explanatory view of the shape of the joint portion according to the above-described embodiment, FIG. 5 is an explanatory view of the fillet deformation at the time of cylindrical screwing according to the above-mentioned embodiment, and FIG.
FIG. 7 is a sectional view showing an example of a conventional helium container, FIG. 7 is a sectional view showing another example of a conventional helium container, and FIG. 8 is a sectional view showing yet another example of a conventional helium container. 1 ... Helium container, 2 ... Vacuum container, 3 ... Liquid helium,
6 ... toroidal coil, 7 ... inner cylinder, 8 ... outer cylinder,
9, 9a… Hollow disk, 13… Internal pressure moment, 17… Screw, 18…
Fillet shape.

Claims (1)

(57) [Scope of utility model registration request] 1. An outer peripheral cylinder having an inner peripheral surface threaded, an inner peripheral cylinder provided on the inner side of the outer peripheral cylinder and having an outer peripheral surface threaded, and an inner peripheral surface having a threaded end. A super-comprising two hollow discs, each of which is screwed into both ends of an inner cylinder and an outer cylinder to form a closed space between the inner cylinder and the outer cylinder, and has a fillet shape at the outer end. Helium container for conduction coil.