JPH04102304A - Manufacture of superconducting coil - Google Patents

Abstract

PURPOSE:To eliminate the cause of separation by removing the inner cylinder of a spool after a superconducting coil has been impregnated with a synthetic resin and fixed. CONSTITUTION:An inner cylinder 1 is formed by combining split bodies 1a of an inner cylinder 1 and flanges 2 are fitted to the outer periphery at the opposite ends thereof and at the same time, a spool 4 is formed by fitting a holding nut 3 to the inner periphery. The holding nuts 3 are fitted to the inner periphery of the inner cylinder 1 at the opposite ends thereof and held in place with the inner diameter thereof being enlarged. A superconducting wire 8 is wound on the inner cylinder 1 in multistage and the wire 8 is impregnated with a synthetic resin and secured in place. In this case, when the superconducting wire 8 is made of Nb3Sn, for example, after heat treatment at temperature of about 700 deg.C, the wire is fixed by impregnating with the synthetic resin. The inner cylinder 1 can be taken away easily by removing the holding nut 3 after the superconducting wire 8 has been impregnated with the synthetic resin and fixed and then removing each split body 1a of the inner cylinder 1 and drawing the inner cylinder 1 in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a superconducting coil by winding a superconducting wire around a winding frame.

[Prior Art] When manufacturing a solenoid coil using a superconducting wire such as a niobium tin (N b s S n ) compound, it is wound around a reel-shaped winding frame and then heat-treated to make it a superconductor. This winding section is impregnated with synthetic resin such as epoxy and fixed to produce a superconducting coil.

[Problem to be solved by the invention] By the way, this superconducting coil is used by being immersed in liquid helium, but there is a difference between synthetic resin such as epoxy and the winding frame (stainless steel)! ! 6 tension coefficient, the winding part integrated with the synthetic resin tends to separate from the winding frame in liquid helium, and this separation may cause superconductor failure.

Further, even in a solenoid coil in which not only Nb1Sn but also other superconducting coil materials are wound around a winding frame and the winding portion is integrated with synthetic resin, superconducting destruction is likely to occur due to the above-mentioned peeling.

The present invention has been made to solve the above problems,
The purpose is to provide a method for manufacturing a superconducting coil that can eliminate the cause of superconducting destruction.

[Means for Solving the Problems] In order to solve the above object, the present invention divides the winding frame inner cylinder into a plurality of parts in the circumferential direction, fits flanges to the outer periphery of both ends of the inner cylinder, and A holding nut was fitted to the inner periphery to form a winding frame, a superconducting wire was wound in multiple stages around the outer periphery of the inner cylinder of the winding frame to form a superconducting coil, and the superconducting coil was impregnated and fixed with synthetic resin. After that, the holding nut is removed and the inner cylinder is removed to produce a superconducting coil.

[Function] According to the above configuration, the cause of peeling can be removed by removing the inner cylinder of the winding frame after impregnating and fixing the superconducting coil with synthetic resin. Further, since the inner cylinder is divided into a plurality of parts in the circumferential direction and held at both ends by holding nuts, it can be easily removed by removing the holding nuts.

[Example code] Embodiments of the present invention will be described based on the accompanying drawings.

1 to 3 show an example of a rectangular winding frame for carrying out the method of the present invention.

In the figure, 1 is an inner cylinder, and this inner cylinder is divided in the circumferential direction. In the embodiment, the inner cylinder 1 is formed by combining three divided bodies 1a as shown in the figure, and a hollow disc-shaped flange 2 is provided on the outer periphery of both ends of the inner cylinder 1.
A holding nut 3 for holding the shape of the inner cylinder 1 is fitted to the inner periphery to form a reel-shaped winding frame 4.

As shown in the figure, the retaining nut 3 has an inner F! The fitting surface is formed into a truncated conical shape inclined in the axial direction so that the diameter of the inner cylinder 1 can be changed when it is fitted into the ffl.

Further, a holding bolt 5 is provided in the inner cylinder 1 in the axial direction so that both f4 portions of the holding bolt 5 protrude from the inner cylinder 1. A threaded portion 6 is formed, and the head portions at both ends of the holding bolt 5 are provided with stopper portions 7 that are engaged with spanners (not shown).
is formed.

Note that the stop portion 7 may be formed at either one end.

Both retaining nuts 3 are connected to the male threaded portion 6 of this retaining bolt 5.
Different female screw holes are formed to be screwed into the bolts, and when the holding bolt 5 is rotated with a spanner, the bolts move away from each other or toward each other.

Next, a method of manufacturing the superconducting coil of the present invention using the winding frame 4 described above will be explained.

When manufacturing a superconducting coil, first, the inside'I! ! li
An inner tube 1 is formed by combining two divided bodies 1a, and a flange 2 is fitted to the outer periphery of both parts of the inner tube 1, and a holding nut 3 is fitted to the inner periphery to form a winding frame 4.

At this time, the holding nuts 3 are fitted onto the inner periphery of both ends of the inner cylinder 1 so as to increase the diameter of the inner cylinder 1 and hold it.

Next, the superconducting wire 8 is tightly wound in multiple stages around the inner cylinder 1 of the winding frame 4, and the wire 8 is fixed by impregnating the wound wire 8 with a synthetic resin such as epoxy. In this case, when the superconducting wire 8 is made of Nb sSn, for example, the wire 8 is wound around the inner tube 1, heat-treated at a temperature of about 700° C., and then impregnated with a synthetic resin and fixed.

In addition, after impregnating and fixing the superconducting wire 8 with a synthetic resin, the inner cylinder 1 is assembled by removing the holding bolts 3, and removing each divided body 1a of the inner cylinder 1.
By removing the inner cylinder 1 and pulling it out in the axial direction, the inner cylinder 1 can be easily removed.

This prevents the winding portion from peeling off from the inner cylinder 1 in liquid helium or the like as in the prior art, and provides a superconducting coil that can eliminate the cause of superconductor breakdown.

Further, when assembling the divided inner cylinder 1 to the winding frame 4, the diameter of the inner cylinder 1 is made large, so that by removing the holding nut 3, the inner cylinder 1 can be easily divided and removed.

Note that even when using a wire such as niobium titanium (NbTi) for the superconducting wire 8, the wire is wound around the winding frame 4, and after the wound wire is impregnated with a synthetic resin and fixed,
Since it is sufficient to remove the inner cylinder 1, a superconducting coil having the same effects as described above can be obtained.

[Effects of the Invention] According to the present invention, it is possible to manufacture a superconducting coil in which the inner cylinder is removed, so there is no possibility of the winding peeling off from the inner cylinder as in the conventional case, and superconducting breakdown can be avoided. FIG. 1 is a side sectional view showing an example of the winding frame for carrying out the method of the present invention, from which the cause can be removed, FIG. 2 is a sectional view taken along the line ■-■ in FIG. It is a sectional view taken along the line ■-■ in the figure.

In the figure, 1 is an inner cylinder, 2 is a flange, 3 is a holding nut, 4 is a winding frame, and 8 is a superconducting wire.

Patent applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Agent: Patent attorney: Makoto Kinutani A (1 other person) Figure 1

Claims (1)

[Claims] 1. The winding frame inner cylinder is divided into a plurality of parts in the circumferential direction, flanges are fitted to the outer periphery of both ends of the inner cylinder, and retaining nuts are fitted to the inner periphery to form the winding frame. A superconducting coil is formed by winding a superconducting wire in multiple stages around the outer circumference of an inner cylinder, and after impregnating and fixing the superconducting coil with a synthetic resin, the holding nut is removed and the inner cylinder is removed. How to make a conduction coil.