JPS60130181A - Superconductive switch - Google Patents

Abstract

PURPOSE:To contrive the improvement of workability by simplifying the winding structure by a method wherein a heater is stuck to the outer periphery of a heat-treated switch body. CONSTITUTION:After a superconductor 3 and a heater 4 are wound around a metallic or ceramic bobbin 1, it is heat-treated. Next, the heater 6 is stuck to the outer periphery thereof. Then, it is covered with thermal insulation epoxy resin. Such a formation simplifies the winding structure and thus improves the workability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a superconducting switch necessary for operating a superconducting coil used in a magnetic levitation train or the like in persistent current mode.

[Prior art and its problems]

There are two methods of manufacturing switches using Nb3Sn superconductors. This is a method of winding a superconducting wire that has been heat-treated to form Nb38n, but in this case, a large amount of bending φ is added to the Nb3Sn, and the current carrying capacity of the superconducting wire is significantly deteriorated. Furthermore, when using a tape-shaped superconducting wire with little bending, there are drawbacks such as limited shape and poor workability.

The second method is to wind the wire before heat treatment and then heat treat it to create υNb.
, sn is formed. In this case, since bending strain is not an issue, the conductor dimensions can be freely selected, and the winding work can be done without worrying about bending or the like.

The present invention relates to a switch structure using this second manufacturing method. Since the heat treatment temperature after winding is as high as about 700°0, conventional switch-off heaters were insulated with glass cloth or the like and wound together with the superconducting wire. However, there were 19 drawbacks such as the winding structure was complicated and the workability was poor.

[Purpose of the invention]

An object of the present invention is to provide a superconducting switch with a simplified winding structure and improved workability.

[Summary of the invention]

A heater is attached to the outer periphery of the rolled and heat-treated switch body, and the outside is covered with a heat insulating material such as epoxy.

〔Effect of the invention〕

The winding process is simplified and work efficiency is improved.

[Embodiments of the invention]

Figure 1 shows a conventional example, where 1 is a whole or ceramic winding frame;
2 td Nb, Sn superconducting wire; 3 is an electrical insulator such as glass cloth; and 4 is a heat wire electrically insulated with glass cloth or the like. ] A superconducting wire 3 and a heater 4 are wound around a winding frame, which is heat-treated, and then covered with an epoxy resin 5 for thermal insulation.

FIG. 2 shows an embodiment of the invention in which the heater is not wound within the bobbin. After the wound frame is heat-treated, a heater wire 6 coated with formal leather or the like is attached to its outer periphery. For example, as shown in FIG. 3, the heater wire may be wound around the entire winding frame in a toroidal manner. On top of this, perform the same insulation treatment as before.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a conventional example, and FIG. 1 is a perspective view showing the present invention. 1. Winding frame, 2. Superconducting wire, 3.6. Heater, 5. Heat insulation layer.

Claims (1)

[Claims] In a thermal superconducting switch in which a wire with Nb filaments embedded in a Cu5n matrix is wound and then heat treated to form an Nbl1Sn superconductor, the structure is such that a switch OFF switch is attached to the outer periphery of the switch after heat treatment. A superconducting switch featuring