JPH0616368B2 - Spacer superconducting wire - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention is used for, for example, a superconducting magnet,
The present invention relates to a superconducting wire in which a spacer is spirally wound.

[Technical background of the invention and its problems]

Conventionally, a glass tape is impregnated with epoxy resin to make a semi-cured prepreg tape into a spacer. There is a superconducting magnet (for example, Japanese Examined Patent Publication No. Sho 49-7398) in which spacers are adhered between the superconducting wires and liquid helium is provided between the spacers. However, since the hard glass fiber is used as the material of the spacer, if the semi-cured epoxy resin that bundles the glass fiber is melted during the heat treatment, the end of the glass fiber may fuzz. Further, when the magnet is formed using this superconducting wire, if the spacer is hit or rubbed, the glass fiber is easily broken, and the broken glass fiber becomes fuzzy during the heat treatment. This fluff has a problem of obstructing the flow of liquid helium which is a refrigerant.

[Object of the Invention]

An object of the present invention is to provide a spacer-wound superconducting wire having excellent cooling performance by spirally winding a spacer which is less fluffy and resistant to friction and impact.

[Outline of Invention]

The present invention comprises a base material of a tape-shaped spacer made of a thread in which a plurality of organic fibers are combined, and a superconducting wire is formed by spirally winding the spacer, thereby forming a superconducting magnet. It reduces standing and damage.

Example of Invention

Example 1 Hereinafter, a first example of the spacer-wound superconducting wire of the present invention will be described with reference to FIGS. 1 and 2. (1)
Is an elongated enamel superconducting wire with a rectangular cross section,
The enamel superconducting wire (1) is made by baking the enamel insulation (3) on the superconductor (2) composed of a plurality of superconducting filaments and copper. (4) is a prepreg spacer composed of an organic fiber such as polyaramid fiber and an epoxy resin. A tape-shaped spacer having a constant width (W) is attached to the enamel superconducting wire (1) at a constant interval (t). ), And is wound in a spiral. A space (t) is a cooling channel (5) which serves as a passage for liquid helium.

FIG. 2 shows the structure of the base material of the spacer (4) shown in FIG. The base material of the spacer (4) is a thread formed by twisting multiple organic fibers.
A plurality of warp threads (6a) composed of (6) and arranged in the length direction (l) of the spacer (4), and diagonal threads (6b) woven in zigzag at an angle to the length direction (l). ) Is a cord tape woven into a width (W).

Next, the operation will be described.

Since the thread (6) of the base material of the spacer (4) is made of organic fiber,
It becomes softer than a yarn formed by twisting hard glass fibers, and even if the semi-cured epoxy resin that bundles the fibers melts, the fluffing of the organic fibers is small. The base material of the spacer (4) is composed of a cord tape woven with continuous threads (6), and the end of the thread (6) is not present in the middle of the spacer (4).
There is no fuzz with the terminal of (6). Further spacers (4)
The base material is a warp (6a) and a diagonal thread (6b) woven into a predetermined width (W), and the width (W) is cut along the length direction (l).
The thread (6) does not end up and fluff due to cutting.

Table 1 shows the degree of damage to various spacer tapes due to the impact when a steel ball (diameter 10 cm, weight 4.3 kg) is freely dropped from a height of 50 cm, and FIGS. Three
belongs to.

According to Table 1, it is clear that the conventional substrate using the glass fiber is easy to break and the substrate using the polyaramid fiber is hard to break. Even with organic materials, the polyimide film was easy to break. In this way, the spacer (4) has excellent impact strength, and even if it is struck and rubbed, it does not stand up too much, so a spacer-wound superconducting wire using this is easy to mold into a superconducting magnet. is there.
Further, since the spacer (4) hardly stands up during the heat treatment, there is no problem that the standup obstructs the flow of liquid helium in the cooling channel (5).

Embodiment 2 FIG. 3 shows the base material of the spacer (4) of the second embodiment. This is arranged roughly at right angles to the plurality of warp yarns (6a) arranged in the length direction (l) and roughly arranged in the length direction (l).
It is made by weaving multiple thin cotton threads (7) that are easy to cut.

This base material can be cut into a predetermined width (W) after the prepreg treatment, and the cotton thread (7) to be cut is roughly woven, so that the number of cut ends of the cotton thread (7) is small. Also, the cotton thread (7) is a warp thread of a plurality of threads (6) arranged in a predetermined width (W).
(6a) can be held so that it does not spread. Otherwise, the same operational effects as in Example 1 can be obtained.

Embodiment 3 FIG. 4 shows the base material of the spacer (4) of the third embodiment. This shows a substrate which is composed of only a plurality of warp threads (6a), is dense in the width direction, and is aligned with the width (W). Others are as in Example 1.

This base material is impregnated with an appropriate amount of epoxy resin, then spirally wound around the enamel superconducting wire (1) shown in Fig. 1, and then the epoxy resin is semi-cured to make the spacer (4) enamel superconducting. Can be glued to the wire (1). Otherwise, the same operational effects as in Example 1 can be obtained.

〔The invention's effect〕

As described above, according to the present invention, since the base material of the spacer is composed of a plurality of twisted organic fibers, especially the special polyaramid fiber, the spacer becomes strong and flexible, and the spacer winding superconducting wire is easy. Can be molded into a superconducting magnet with stable quality. Furthermore, since the spacers do not become flicker during the heat treatment, there is no problem of obstructing the flow of liquid helium. Therefore, the spacer-wound superconducting wire according to the present invention can be formed into a highly reliable superconducting magnet having an excellent cooling effect.

[Brief description of drawings]

1 is a cross-sectional perspective view of a main part of a first embodiment of a spacer-wound superconducting wire of the present invention, and FIG. 2 is an explanatory plan view showing the base material of the spacer of FIG. 1, FIGS. 3 and 4. [FIG. 6] is an explanatory top view showing a base material of spacers of the second and third embodiments. 1 ... Enamel superconducting wire, 2 ... Superconductor 4 ... Spacer, 6 ... Thread 6a ... Longitudinal thread, 6b ... Diagonal thread 7 ... Cotton thread

Claims (3)

[Claims] 1. A superconducting wire (1) in which a tape-shaped spacer (4) composed of a base material and a resin is spirally wound, and the base material of the spacer is a thread formed by combining a plurality of organic fibers ( A spacer-wound superconducting wire characterized by comprising in 6). 2. The spacer-wound superconducting wire according to claim 1, wherein the organic fiber is a polyaramid fiber. 3. The spacer (4) constitutes a base material using a plurality of continuous threads (6a) or (6b) made of organic fibers, and the thermosetting resin impregnated in the base material is in a semi-cured state. The spacer-wound superconducting wire according to claim 1 or 2, which is formed by using the prepreg tape described above.