JP3120625B2 - Oxide superconducting conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductor formed by assembling oxide superconducting wires.

[0002]

2. Description of the Related Art As an oxide superconducting wire, a wire having silver as a sheath material is known. This wire is a conductor that uses silver as a composite material to cover the oxide superconductor and achieves an improvement in critical current density and thermal stability of the conductor.

[0003] Such superconducting wires are sometimes aggregated in order to increase the current capacity, and the aggregated wires are used after being impregnated and fixed with an impregnating material such as resin.

[0004]

Generally, the impregnated resin has a low thermal conductivity, so that the heat dissipation of the superconductor when heat is generated is deteriorated, and the conductor may be thermally unstable.

An object of the present invention is to improve the thermal stability of a conductor by reducing the heat dissipation resistance of heat generated inside an impregnating material when a superconducting element wire is impregnated and fixed with the impregnating material.

[0006]

In order to achieve the above object, according to the present invention, a metal material having a higher thermal conductivity than an impregnating material is brought into contact with a metal sheath superconducting wire disposed inside a collective conductor, and Is exposed to the outside so that heat can be dissipated.

In this case, the heat dissipating metal material is desirably arranged along the conductor, and the form may be one or divided into a plurality. The contact with the oxide superconducting wire may be sandwiched between the superconducting wires, or may be wound around the collective conductor.

[0008] As the oxide superconductor that is the main component of the wire, yttrium-based, bismuth-based, thallium-based and other materials can be used.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
FIG. 1 shows an example of a current reciprocating type current lead conductor 1 for exciting a superconducting coil. As shown in FIG. 5, the current lead conductor 1 is arranged and used between a superconducting coil 9 immersed and cooled in liquid helium 8 and a connection lead 10 connected to a power supply unit such as a power supply. Is done. In FIG. 2, reference numeral 11 denotes a liquid nitrogen anchor.

When the conductor 1 constituting the current lead is laminated with about 50 silver alloy sheath oxide superconducting tape wires 2,
Heat radiation fins 3 made of a silver-copper alloy are interposed between the superconducting tape wires 2 at a predetermined interval during the lamination, so that the adjacent superconducting tape wires 2 are in good thermal contact by heat treatment. Have been to be.

As shown in FIG. 1, the conductor 1 is impregnated and fixed with an impregnating material 5 made of, for example, an epoxy resin, and is adhered on a reinforcing material 6 made of, for example, stainless steel.

Each of the radiating fins 3 is appropriately sandwiched between a T-shaped one and an H-shaped one, and after the impregnation with the impregnating material 5 is completed, each end 4 exposed to the outside is shown in FIG. Thus, the heat radiation effect by the cooling gas can be obtained by twisting in a certain direction. FIG. 3 shows another example of the conductor. In the case of the conductor of this example, the heat radiating fin 3 has its end 4 exposed to the outside through the side surface of the superconducting tape wire 2 laminated on the way, and the reinforcing member 6 has a U-shaped cross section. ing.

The point that the end portion 4 of each radiating fin 3 is twisted in a predetermined direction is the same as the previous example, but each radiating fin 3 is displaced from the upper and lower positions of the overlap with the superconducting tape wire so as to be superconductive. It is in contact with the tape wire 2. By shifting the position in the stacking direction in this manner, the internal heat can be more effectively released.

FIG. 6 shows an application example in which the conductor according to the present invention is used as a current lead conductor, in which the radiation fins 3 are used as electrodes of a conductor quench detection circuit. In this case, in order to monitor the loss voltage of the conductor 1 with a voltmeter 12 placed outside the system of the cryostat 7 and make the voltmeter 12 a circuit interlocked with a power supply 14 for power supply, a lead wire 13 for voltage measurement is used. Is attached to the end 4 of the radiation fin 3 at an appropriate position.

[0015]

According to the present invention, by disposing a metal for heat dissipation, the heat dissipation resistance of heat generated inside the impregnating material can be reduced, and the thermal stability of the conductor can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a conductor according to the present invention.

FIG. 2 is a plan view of the conductor shown in FIG. 1;

FIG. 3 is a cross-sectional view showing another example of the conductor according to the present invention.

FIG. 4 is a plan view of the conductor shown in FIG. 3;

FIG. 5 is an explanatory view showing an application example of the conductor according to the present invention.

FIG. 6 is an explanatory view showing another application example of the conductor according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Current lead conductor which consists of an oxide superconducting conductor 2 Superconducting tape wire 3 Radiation fin which consists of silver alloys 4 End exposed to the furnace outside 5 Impregnation material with epoxy resin 6 Reinforcement material made of stainless steel

Claims (4)

(57) [Claims] 1. A conductor formed by assembling a plurality of metal-sheathed oxide superconducting wires and impregnating them with an impregnating material, contacting a metal material having a higher thermal conductivity than the impregnating material with the superconducting wire. Characterized in that a portion of the oxide superconductor is exposed to the outside. 2. The conductor according to claim 1, wherein a part of said metal material is sandwiched between superconducting wires. 3. The conductor according to claim 1, wherein a part of the metal material is wound around a collective conductor. 4. The conductor according to claim 1, wherein an exposed portion of the metal material is oriented in a predetermined direction.