JPS59224008A - Superconductive conductor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting conductor, and particularly to the structure of a casing that covers a conducting wire.

To explain an example of the structure of a conventional bundled superconducting conductor, the first
As shown in the figure, to explain the effect of a large number of superconducting wires 1 twisted together, in the superconducting conductor configured as shown in FIG. 1, a cryogenic coolant (liquid helium, or supercritical helium) to cool the conductor and maintain it in a superconducting state. Therefore, this type of stranded wire conductor has a larger contact area with the refrigerant and has superior superconducting stability than conventional superconducting conductors made of thick wires.

Conventional bundled stranded wire type superconducting conductors are constructed as described above, so when this conductor is wound into a large coil, stress exceeding the allowable value is generated in the length because the superconducting wire is a stranded wire. There was a drawback.

This invention has been made in view of the above, and aims to provide a superconducting conductor that eliminates the drawbacks of the conventional ones as described above. Stress that exceeds the allowable value is generated (・).

An embodiment of the present invention will be described below with reference to the drawings.

As shown in Fig. 1, in this invention as well, the casing 3 covers the stranded wire λ, which is made by twisting a large number of superconducting wires l into a bundle, in exactly the same way as in the conventional method shown in Fig. 1. However, the casing 3 is characterized in that a part thereof has a bellows-like extensible part. Considering the action, in a superconducting conductor configured as shown in Fig. 2, the tensile force due to the electromagnetic force during thermal contraction 2 during initial cooling is absorbed by the expansion and contraction of the bellows-like expansion and contraction part. No large stresses are generated in the casing.

In the above embodiment, a square bellows is shown and explained, but a cylindrical bellows may be used.

As described above, according to the present invention, by providing the casing of the bundled stranded wire conductor with a bellows-like expandable part, the stress generated in the casing during initial cooling of a large coil or during one energization can be reduced to a permissible value. It has the effect of being able to

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view showing a conventional superconducting conductor with a part of its casing removed, and FIG. 2 is a perspective view similar to FIG. 1 showing an embodiment of the superconducting conductor according to the present invention. ! ...Superconducting wire, 2...Twisted wire, 3...Casing, Ge1
．． Bellows-like extension. In each figure, the same reference numerals indicate the same - or &i corresponding parts. Agent Masuo Oiwa

Claims (1)

[Claims] A superconducting conductor in which a large number of superconducting wires are twisted into a bundle and an airtight or reinforcing casing is provided around the bundle of stranded wires, characterized in that a part of the casing is provided with a bellows-like expandable part. A superconducting conductor.