JPH06309957A - Oxide superconductor - Google Patents

Abstract

PURPOSE:To enhance the thermal stability of a superconductor by lessening the heat radiation resistance for the heat which runs inside of an impregnating material when an oxide type superconducting element wire is impregnated with impregnating material and fixed. CONSTITUTION:Around fifty oxide type superconducting tape wires 2 with silver alloy sheath are laminated, impregnated with an impregnating material 5 consisting, for example of epoxy resin, fixed, and adhered onto a reinforcing material 6 consisting, for example of stainless steel. Thus a superconducting conductor 1 is formed. When the tape wires 2 are laminated, part of a heat radiation fin 3 consisting of silver-copper alloy is pinched at a certain spacing between the tape wires 2 to be laminated, and the end 4 exposed to the outside is bent twisted in a certain direction so that a heat radiation effect due to the cooling gas is obtained.

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 a sheath material of silver is known. This wire rod is a conductor that uses silver as a composite material and covers an oxide superconductor to improve the critical current density and achieve thermal stability of the conductor.

Such superconducting wires are sometimes assembled in order to increase the current capacity, and the assembled wires are impregnated and fixed with an impregnating material such as resin before use.

[0004]

In general, the impregnated resin has a low thermal conductivity, which may deteriorate the heat dissipation when the superconductor heats up, and may make the conductor thermally unstable.

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

[0006]

In order to achieve the above object, in 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 arranged inside the aggregate conductor, Part of this is exposed to the outside so that heat can be released.

In this case, it is desirable that the heat dissipating metal material be arranged along the conductor, and the form thereof may be one or may be divided into a plurality of pieces. The contact with the oxide superconducting wire may be sandwiched between the superconducting wires or may be wrapped around the aggregate conductor.

As the oxide superconductor which is the main constituent of the wire, yttrium, bismuth, thallium and other materials can be used.

[0009]

The present invention will be described below with reference to the drawings.
FIG. 1 shows an example of a current reciprocating current lead conductor 1 for exciting a superconducting coil. As shown in FIG. 5, this current lead conductor 1 is used by being arranged between a superconducting coil 9 which is immersed in liquid helium 8 and cooled and a connecting lead 10 which is connected to a power supply unit such as a power supply. To be done. In addition, in FIG. 2, 11 has shown the liquid nitrogen anchor.

The conductor 1 which constitutes the current lead is formed by stacking about 50 silver alloy sheath oxide superconducting tape wire rods 2.
In the middle of the lamination, the radiating fins 3 made of a silver-copper alloy are sandwiched between the superconducting tape wire rods 2 at a predetermined interval, and heat treatment makes good thermal contact between the adjacent superconducting tape wire rods 2. It is supposed to do.

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

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

As in the previous example, the end 4 of each heat radiation fin 3 is bent in a predetermined direction, but each heat radiation fin 3 is superconducting by shifting the position above and below the overlap with the superconducting tape wire. It is in contact with the tape wire 2. By displacing the positions in the stacking direction in this way, the heat inside can be released more effectively.

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

[0015]

According to the present invention, by disposing a metal for heat dissipation, it is possible to reduce the heat dissipation resistance of the heat generated inside the impregnated material, and to improve the thermal stability of the conductor.

[Brief description of drawings]

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

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

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

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

FIG. 5 is an explanatory diagram showing an application example of a 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]

 1 Current lead conductor made of oxide superconducting conductor 2 Superconducting tape wire rod 3 Radiating fin made of silver alloy 4 End exposed outside the furnace 5 Impregnation material with epoxy resin 6 Reinforcing material made of stainless steel

Claims (4)

[Claims] 1. A conductor comprising a plurality of metal sheath oxide superconducting wires assembled and impregnated and fixed with an impregnating material, wherein a metal material having a thermal conductivity higher than that of the impregnating material is brought into contact with the superconducting wire, A part of the oxide is exposed to the outside, and an oxide superconducting conductor. 2. The conductor according to claim 1, wherein a part of the metal material is sandwiched between superconducting wires. 3. The conductor according to claim 1, wherein a part of the metal material is wound around the collective conductor. 4. The conductor according to claim 1, wherein the exposed portion of the metal material is oriented in a predetermined direction.