JPS61258405A - Superconducting magnet - Google Patents

Abstract

PURPOSE:To enable to firmly fix the binding part and the outer ring 4 of the titled magnet by a method wherein, after a metal binding part is provided outside a spacer, a machining work is performed on the outside of the binding part with a high dimensional accuracy. CONSTITUTION:Insulating spacers 2 are arranged on the outer circumferential direction of a superconductive coil 1 leaving a space between them. A single layer of a steel square-shaped wire is wound outside the insulating spacers, and a bind part 3 is constituted. Subsequently, a machining work is performed on the outside of the binding part 3 in such a manner that excellent dimensional accuracy in radial direction having very small range of tolerance is obtained. On the other hand, the inner surface of the outer ring 4 is also machined, and both of the machined surfaces are fixed by heating the outer ring 4, and the outer ring is shrink-fitted to the outer surface of the binding part 3. As a machining work is performed as above-mentioned, almost no dimensional irregularity is generated in the circumferential direction and the axial direction of the coil 1, and the firm and uniform fixing of the binding part and the outer ring 4 can be accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a high-performance and highly reliable superconducting magnet.

[Summary of the Invention] A superconducting magnet is a superconducting coil wound with superconducting wire that is cooled to an extremely low temperature to have zero electrical resistance, allowing a large current to flow through it to generate a strong magnetic field. recent years,
Superconducting magnets are undergoing a process of increasing magnetic fields and storing energy. As a result, the electromagnetic force applied to the superconducting coil is becoming stronger, and in many cases the structure is such that not only the superconducting coil itself bears this electromagnetic force, but also part or all of it is supported by an outer ring that supports it from the outside. Therefore, it is necessary to structurally transmit the radial electromagnetic force of the superconducting coil to the outer ring, and it is necessary to firmly fix the outer ring and the superconducting coil.

The conventional method is to firmly fix the insulating spacer and the outer ring as shown in Patent No. 57-156525.

A method used was to adjust the radial thickness of the insulator placed on the outside of the superconducting coil. This conventional example is described in the third example.
Explain using diagrams.

In FIG. 3, an insulating spacer 2 is arranged between a superconducting coil 1 and an outer ring 4 that supports it. This insulating spacer 2 is divided into two parts and is tapered.
Its thickness can be adjusted. The reason for this is
Although the inner surface of the outer ring 4 can be manufactured with small dimensional tolerances by machining, the outer periphery of the superconducting coil is determined by the winding, so large variations occur in the circumferential direction. In order to adjust this variation, two tapered spacers are used together.

However, this embodiment has the following drawbacks.

The first problem is that the thickness of the insulating spacer 2 increases as it becomes longer in the axial direction. When fixing the outer ring and the superconducting coil, one of the two spacers is inserted into each spacer, but if it is long in the axial direction, it is necessary to have a certain degree of rigidity and a certain degree of taper angle. Therefore, it becomes necessary to increase the thickness. The second is
If not only the circumferential dimension variation but also the axial variation occurs, in this structure, a small piece is placed on the outer periphery of the coil in order to adjust the axial dimension. In this case, a great deal of time will be spent on adjustment, and dimensional variations will inevitably remain after the final adjustment.

[Purpose of the invention]

An object of the present invention is to provide a metal bind part around the outer periphery of a superconducting coil, machine the outer side of the bind part, and then fit and fix an outer ring thereto, thereby achieving strong and simple fixing and ensuring reliability. Our goal is to provide high quality superconducting magnets.

[Summary of the invention]

In the present invention, the spacer of the superconducting coil is combined into a tapered shape, and instead of adjusting the variation in the radial dimension,
A metal binding part is provided on the outside of the spacer, and then
By machining the outside, 1 dimensional accuracy is achieved 5
This is intended to be firmly fixed to the outer ring.

[Embodiments of the invention]

FIG. 1 shows one embodiment of the present invention. In this figure, a superconducting coil 1 is a circularly wound coil, and an insulating spacer 2 is provided on the outside thereof.

It has a bind part 3 on the outside, and an outer ring 4.
is fixed. This outer ring is supported by the upper lid of the vacuum container 7. These superconducting magnets are placed in a helium container 6.

The container 6 is filled with liquid helium 5, and the superconducting coil 1 is maintained at an extremely low temperature. A radiation shield 8 is provided between the helium container 6 and the vacuum container 7 to reduce the intrusion of heat from room temperature to extremely low temperature.

In this example, the fabrication method is as follows.

The superconducting coil 1 is made by winding a superconducting wire, and in this embodiment, the winding frame is removed after winding. As shown in FIG. 2, insulating spacers 2 are arranged on the outside of this superconducting coil 1 at intervals in the circumferential direction. Outside of that,
The binding part 3 is constructed by winding a steel rectangular wire in one layer. Thereafter, the outer surface of this binding part 3 is machined to achieve radial dimensional accuracy so that the tolerance is within a very small range. On the other hand, the inner surface of the outer ring 4 is also a machined surface, and the machined surfaces are fixed by heating the outer ring.
It is fixed to the outer surface of the bind part 3 by shrink fitting. In this case, since it is machined, there is almost no variation in dimensions in both the circumferential and axial directions, resulting in a strong and uniform fixation. Furthermore, since the binding material is made of metal and has high rigidity, machining can be performed on the outer periphery of the binding portion even for the arrangement of spacers as shown in FIG. 2.

Because the outer ring is firmly fixed to the superconducting coil,
Provides sufficient support against radial electromagnetic forces, improving reliability.

Another embodiment is shown in FIG. FIG. 4 shows a wound binding material 10 with insulation 9.

This also serves as external insulation for the coil, and in the case of a coil that starts up quickly, the induced current during excitation.

The effect is the same in this case as well, which has the dual meaning of preventing flow into the binding portion.

[Effects of the Invention] According to the present invention, a superconducting coil can be made strong and easily, resulting in a highly reliable superconducting magnet.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a superconducting magnet according to an embodiment of the present invention, FIG. 2 is a detailed cross-sectional view of the superconducting magnet according to the embodiment shown in FIG. 1, and FIG. 3 is a cross-sectional view of a conventional superconducting magnet. FIG. 4 is a detailed cross-sectional view of a superconducting magnet according to another embodiment of the present invention.6 1...Superconducting coil, 2...Insulating spacer, 3...
・Binding part, 4...Outer ring, 9...Insulation, 10
...Binding material.

Claims (1)

[Claims] 1. A superconducting magnet including a superconducting coil wound with superconducting wire and an outer ring that supports the radial electromagnetic force of the superelectric coil, which is bound to the superelectric coil, and then the outer surface A superconducting magnet characterized by having a processed metal binding part and an outer ring placed on the outside of the binding part.