JPS629606A - Superconductive coil - Google Patents

Abstract

PURPOSE:To enable electric insulation to be accomplished without generation of a distortion which is detrimental to a superconductive wire as well as to manufacture the necessary cooling path on the title coil at low cost by a method wherein an insulat ed spacer is wound around a reinforcement substrate providing a vacant space, the vacant space is used as a cooling path, and they are used as a reinforcement material by performing an insulating treatment. CONSTITUTION:A Kapton tape, for example, which is very thin when compared with the thickness of the reinforcement base material 22, is half-wound on the surface of the reinforcement base material 22 made of stainless steel, for example, and the electric insulation between coil turns is conducted using an insulating material 23. Besides, a vacant space is provided on the surface, a Nomex tape and the like, for example, is spirally wound and an insulating spacer 24 is formed. A cooling path 25, where liquid helium passes, is formed between a superconductive wire 21 and a reinforcement material 26 using said insulated spacer 24. When the coil is wound as above-mentioned, the superconductive wire 21 can be wound around a coil bobbin 33 from a superconductive wire take-up drum without having a detrimental distortion, and at the same time, the reinforcement material 26 is wound around the coil bobbin 33 from a reinforcement material take-up drum 32 while the prescribed tention T is being applied.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a large capacity superconducting coil (-) used for nuclear fusion, power storage, etc. [Prior Art] Fig. 4 shows For example, it is a perspective view of an insulated conductor used in a conventional superconducting coil shown in JP-A-59-29404, in which (1) is a superconducting wire, (21 is a superconducting wire (wound around (3) is an insulating spacer wound between the superconducting wire (tll) and the insulating material (2), (4) is the surface of the superconducting wire (1) (2) is an open cooling passage.

Next, the operation will be explained. An insulating spacer (3) is wound around the surface of the superconducting wire (110), and then an insulating sheet (21) is wound on top of the superconducting wire (110). When the superconducting wire (1) is crushed in liquid helium (see 2), the refrigerant cools the surface of the superconducting wire (1) through the cooling passage (4) and maintains the superconducting state.

[Problem that the invention seeks to solve]

As mentioned above, in conventional superconducting coils, the insulating spacer (3) and insulating material (2; If high temperatures are reached and the function of the insulating material (2) deteriorates, or if strain is applied after heat treatment, the superconducting properties will be significantly deteriorated, it is necessary to install the insulating material (2) and the cooling passage (4). It required special treatment, was difficult to work with, and had problems such as high production costs.

This invention was developed to solve the above-mentioned problems, and it is possible to perform electrical insulation without causing harmful distortion to the superconducting wire, and also to reduce the cost of the necessary cooling passages.
The aim is to obtain a superconducting coil that can be manufactured.

[Means for solving problems]

This invention ζ: Such a superconducting coil is provided by winding an insulating spacer around a reinforcing base material with a gap in between, and using the gap as a cooling passage.
These are insulated and used as reinforcing materials.

[Effect]

In this invention C:, the insulation treatment and cooling passage formation were performed by winding the reinforcing base material section; insulating spacers with gaps between them, using the gaps as cooling passages, and insulating them and using them as reinforcing materials. Can be constructed using reinforcement material alone.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
According to the figure, (21) is heat treatment C: more mature Nb
A superconducting wire containing a compound superconducting material such as 38n, ■) is a reinforcing base material such as stainless steel, and 24 is an insulating material made by wrapping Kapton tape twice and three times over the reinforcing base material. A continuous spacer is wound with a gap in between, (2) is a cooling passage created by the gap between the insulating spacer (c), and (2) is a reinforcing material formed by insulating these.

The superconducting wire (211 and reinforcing material ■
The winding method will be explained. In FIG. 2, (31) is a superconducting wire winding drum that supplies superconducting wire (211), (32
) is a reinforcing material winding drum that supplies the reinforcing material (2), and (33) is a coil bobbin that winds up the superconducting wire (21) and the reinforcing material (to). FIG. 3 is an explanatory diagram of a superconducting coil manufactured by the above coil winding. (41) is a coil interlayer spacer.

First, a pre-heat-treated composite material made of copper, niobium, copper-tin alloy, etc. is wound twice around a superconducting wire winding drum (31) and subjected to a predetermined heat treatment. The result is a compound-based superconducting wire +211. Next C:, Electromagnetic force C: In order to strengthen the coil winding, for example, the surface of the reinforcing base material made of stainless steel (; For example, the thickness of the reinforcing base material @ (2) Very C: Thin Kapton tape The insulating material provides electrical insulation between the coil turns between A and I.Furthermore, leave a gap on this surface and wrap Nomex tape or the like in a spiral shape to create an insulating spacer. A cooling passage through which liquid helium passes is formed between the insulating spacer (C2) and the superconducting wire (21) and the reinforcing material (C).Using the above, coil winding When the process is carried out as shown in Figure 2C2, the superconducting wire Ω is rolled onto the superconducting wire winding drum (31) without being subjected to harmful distortion.
From, coil bobbin (33) (: wound, simultaneous C:
Since the reinforcing material (to) is wound from the reinforcing material winding drum (32) to the coil bobbin (33) while applying a predetermined tension T, a superconducting coil with less deterioration of superconducting properties can be manufactured.

Furthermore, in the coil manufactured as described above, the function of the insulating material is sufficiently maintained, so that the coil is C: electrically safe. As described above, the insulation treatment and taping for cooling passages of this invention can be applied solely as a reinforcing material. It is possible to use organic materials with good workability.Furthermore, when winding the heat-treated superconducting wire (2B) into a coil, there are steps that degrade the superconducting properties and complicated electrical insulation and cooling passage construction. No process required (-)

In the above example, one compound-based superconducting wire was also shown, but an alloy-based superconducting wire such as niobium titanium (211
It may be.

Furthermore, although the above embodiments illustrate the stranded superconducting wire 12, a monolithic superconducting wire c2υ may also be used.

Further, in the above embodiment, a material made of insulating material is used, but it may be omitted as long as the refrigerant and the insulating spacer @ function as an electrical insulating material.

Further, although FIG. 3 of the above embodiment shows a pancake-wound superconducting coil, other winding types may be used.

〔Effect of the invention〕

As described above, according to the present invention, the insulating spacers are wound around the reinforcing base material with gaps between them, the gaps are used as cooling passages, and these are insulated and bound with the reinforcing material. , maintains electrical and insulating performance, and has the advantage that these effects can be obtained easily and at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a superconducting coil according to an embodiment of the present invention, FIG. 2 is a conceptual diagram illustrating a winding method according to the present invention, and FIG. 3 is an embodiment of a superconducting coil according to the present invention. FIG. 4 is a perspective view showing a conventional superconducting coil. In the figure, (21) is a superconducting wire, @ is a reinforcing base material, (to) is an insulating spacer, (to) is a cooling passage, and (■) is a reinforcing material. In addition, the same symbols in the figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) In a superconducting coil formed by winding a superconducting wire and a reinforcing material, an insulating spacer is wound around a reinforcing base material with gaps, the gaps are used as cooling passages, and these are insulated and then A superconducting coil characterized by being used as a reinforcing material. (2) The superconducting coil according to claim 1, wherein the reinforcing base material is insulated.