JPS59132512A - Method of forming separator in forcibly cooling superconductive conductor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting wire used in a superconducting coil of a superconducting magnet such as a nuclear fusion reactor, and particularly to a type of superconducting wire that is cooled by forced circulation using a cooling medium.

Recently, a so-called hollow superconducting wire with a cooling medium passage formed in the center of its cross section has been used, and a cooling medium such as supercritical pressure helium is forced to circulate in the cooling medium passage to forcibly cool the superconducting wire from the inside. Various coils have been proposed. For example, as shown in Figure 1, the hollow superconducting wire used in such a superconducting coil has a cold core in the center.
A type in which a supercapacitor fi13A is embedded in the wall surface of a stabilizing base material 2 made of copper or the like having a rectangular cross section forming the fA medium passage 1, or a type of copper etc. having a rectangular cross section as shown in FIG. Ultra-fine multicore superconducting strands 3B are placed on the outer surface of the stabilizing base material 2.
In addition, as shown in FIG. 3, grooves 4 are formed on the outer surface of the stabilizing base material 2 having a rectangular cross section, and each groove 4 has formed superconducting cables. There are models in which 3C is fitted and fixed.

In a superconducting magnet using such a forced cooling type superconducting wire, a cooling medium is forced to circulate inside the conductor, so each part is evenly cooled, and the coil is compact and has high mechanical strength. Furthermore, it has the advantage of requiring less cooling medium, but on the other hand, since the superconducting strands are cooled indirectly through a stabilizing base material such as copper, the cooling efficiency is low. Therefore, there is a problem in that when -1 to -1 spots occur in a part of the superconducting wire for some reason and the superconducting)9 characteristics are lost, recovery is delayed.

On the other hand, as shown in FIG. 4', a large number of superconducting strands 3B are housed inside a rectangular cylindrical body 6, and a cooling medium such as liquid helium is flowed into the gaps 7 between the superconducting strands. A so-called bundle-type superconducting wire has also been proposed, in which a cooling medium is brought into direct contact with the surface of the superconducting element "a3B, and direct cooling is performed. However, in this type of superconducting wire, a cold fJ'l medium is used. It is quite difficult to flow the cooling medium smoothly, and there are disadvantages in that the flow of the cooling medium is locally blocked and the temperature rises, causing heat spots, and that heat spots cannot be recovered quickly.

Therefore, the present inventors took advantage of the above-mentioned hollow superconducting wire and the direct cooling type superconducting wire shown in FIG. 4 to achieve a high overall cooling efficiency and good local stability. Patent application for superconducting wire with a structure that can withstand electromagnetic force [1]
No. 857-45795. An example of this proposed electromotive conducting wire is shown in FIG.

In Figure 5, copper, copper alloy, high purity aluminium 18,
Inside the hollow stabilizing base material 10 with a rectangular cross section made of a highly conductive material such as an aluminum alloy, an alloy superconducting material such as a Nb Ti alloy, a Nb Ti Ta alloy, or Nb3Sn, Va Ga, Nb3Ge W (
7) Multiple superconducting wires 11 made of compound superconducting material
is accommodated. The outside of the stabilizing base material 1o is covered with a rectangular cross-sectional outer covering made of copper, stainless steel, titanium, titanium alloy, etc., with an appropriate number of separators 12 made of the same material as the stabilizing base material 10 or stainless steel 14, etc. 13
The separator 12 defines a cooling medium flow path 1 between the outer surface of the stabilizing base material 10 and the inner surface of the jacket 13.
4 is guaranteed. Roughly, the stabilizing base material 10 includes:
A plurality of communicating passages 15 are formed in the shape of a round hole, a long hole, or the shape of a sulin 1 to communicate the cooling medium flow path 14 on the outside with the space on the inside. Therefore, the cooling medium flow path 1
A cooling medium such as supercritical helium flowing through the communication path 15
flows into the gap 16 between the superconducting wires 11 inside the stabilizing base material 1o, and directly flows into the superconducting JR111 as a cold IJ.
The I medium will come into contact with it. And this stabilization Bl 4
A flow of the cooling medium also occurs in the inter-wire gaps 16 of the superconducting wires 11 inside the superconducting wires 310.

In the superconducting wire proposed above, the overall cooling is carried out through the cooling medium flow path 14 outside the stabilizing base material 10.
Since this is done by a steady flow of medium, uniform cooling is performed in the same way as in the case of conventional hollow superconducting wires, and moreover, the superconducting wire 11 itself in the stabilizing base material 10 is also directly cooled as it comes into direct contact with the cooling medium. 4, the cooling efficiency is high, and the cooling medium outside the stabilizing base material 10 and the cooling medium inside the stabilizing base material 10 are exchanged by flowing in and out through the communication path 15. Unlike directly cooled superconducting wires, the temperature of the inner cold III medium increases locally, causing heat spots and delays in recovery, which is extremely rare, resulting in excellent overall cooling efficiency and constant stability. It also has extremely good properties and transient stability. In addition, in the above-mentioned superconducting wire, when disturbance occurs and the superconducting state is broken and a magnetic flux flow state occurs, the current is shunted to the stabilizing base material, so heat is generated even in the stabilizing base material. However, since the heat generated by the stabilizing base material is also cooled by the cooling medium on the outside, the superconducting state can be recovered more quickly than with the conventional handle-type direct cooling method shown in Figure 4. As mentioned above, the coolant inside and outside the stabilizing base material flows through the communication path,
Because of this, the superconducting cables in the stabilizing base material have a joint structure that makes it difficult for the cooling medium to flow smoothly in the longitudinal direction, such as a braided structure or a molded HA l'! There is no particular problem even if it is a four-layer structure, and there is no restriction on the aggregate structure of the superconducting fibers, so there is a large degree of freedom in its design, and the superconducting wire is placed in the center of the superconducting wire. As a result, the properties of the superconducting wire are less likely to deteriorate due to the effects of bending strain when wound around a coil such as a magnet, and since the superconducting wire is protected by the outer stabilizing base material, superconducting wires are protected by external electromagnetic force. It has much superior properties compared to conventional superelectric S wires, such as effectively preventing damage and deterioration of the cable wire.

In the superconducting wire shown in FIG. 5, a plurality of superconducting strands 1
The superconducting wire assembly 17A, 17B consisting of 1 is stacked in two layers and housed in the stabilizing base material 10, and between the two layers of superconducting wires 17A, 17B, a high-resistance conductive material such as cupronickel is placed. A thin chi 118 is inserted so that the superconducting cable assemblies 17A and 17B in each layer do not come into direct contact with each other. With this configuration, a coupling current flows between each layer, and it is possible to prevent deterioration of the superconducting properties in cases where the excitation speed is extremely high, such as in pulse drive, for example. Furthermore, in the iB conductive wire shown in FIG. 5, each layer's superconducting wire Fl! A thin tape 19 made of the same high-resistance conductive material as described above is also inserted between the aggregates 17A, 17B and the stabilizing base material 10, and this tape 19 connects the two layers via the stabilizing base material 10. It plays the role of preventing coupling current from flowing to the However, in order to simplify the drawing, in FIG. 5, the tape 19 is shown provided on the entire outer surface of each layer 17A, 17B, but in reality, it prevents the inflow of the cold i1 medium from the communication path 15. It is normal to form spaces as appropriate to prevent this.

As described above, the proposed superconducting wire has better cooling efficiency and stability than conventional superconducting wires, and also has excellent mechanical strength against bending and external forces. mechanical, energy storage, nuclear magnetic resonance absorption,
It is ideal for various uses such as magnetic separation, especially for superconducting wires for large, high-field magnets, and especially when superconducting wires are housed in multiple layers and a Q718Y19 made of a high-resistance 1m material is inserted. Since coupling current between each layer is prevented by the high-resistance conductive tape, it is ideal for pulsed applications with large currents. However, when the present inventors conducted further research for practical application, it was found that the above-proposed superconducting wire still had the following problems.

As mentioned above, in the proposed superconducting wire, the separator 12 is provided between the stabilizing base material 10 and the jacket 13, and the separator 12 secures the cooling medium passage 14. The separator 12 for securing the medium flow path 14 is provided by winding a round wire or a flat wire (flat wire in the figure) in an open spiral around the outside of the stabilizing base material 10, as shown in FIG. It will be done. However, since the stabilizing base material 10 has a rectangular cross section as shown, when the round wire or rectangular wire is wound around the stabilizing base material 10, each edge of the stabilizing base material 10 Lifting up in some parts is unavoidable. In this way, the stabilizing base material 10 is
and the separator 12 is covered with an outer covering 13, and further,
When wound into a coil to form a magnet,
Twisting may occur in the entire superconducting wire, and furthermore, the superconducting cable inside the stabilizing base material 10 may be deformed.

In addition, when the separator] 2 is provided by winding a round wire or a flat wire in an open spiral around the outside of the stabilizing base material 10, it is difficult to bring the round wire or flat wire into close contact with the stabilizing base material 10 by simply winding it. It is difficult to do this, and after the outer sheath 13 is coated and molded, the above-mentioned gap between the stabilizing base material 10 and the separator 12 is reduced due to the electromagnetic force generated when the coil is wound and energized for use in a magnet or the like. This allows the stabilizing base material 10 and its inner layer material to move, causing quench to occur.

Therefore, in order to eliminate the above-mentioned inconvenience, after winding a round wire or a rectangular wire around the outside of the stabilizing base material 10, the wrapped round wire, etc. should be directed toward the outside of the stabilizing base material 10. Press,
It needs to be in close contact. However, when pressing a round wire or the like toward the outer surface of the stabilizing base material 10, the stabilizing base material 10 deforms due to the pressing force, and the stabilizing base material 10
Superelectric 3 inside? There is an inconvenience if the strands are damaged.

This invention has been made in view of the above circumstances, and when manufacturing the superconducting wire described in the above-mentioned Japanese Patent Application No. 57-45795, it is possible to stabilize the separator provided between the stabilizing base material and the jacket. An object of the present invention is to provide a method for forming a separator that can be molded in close contact with a stabilized base material without damaging the inside of the stabilized base material.

That is, in the separator forming method of the present invention, a plurality of superconducting strands are housed inside a hollow stabilizing base material having a rectangular cross section, and a plurality of superconducting strands are housed between the stabilizing base material and an outer sheath surrounding it. A separator is provided, and this separator ensures a continuous coolant flow path in the longitudinal direction of the stabilizing base material.
The stabilizing base material is formed with a communicating path that communicates the inside and outside thereof, and the cooling medium flowing through the cooling medium flow path flows into the gap between the superconducting wires in the stabilizing base material through the communicating path. In forming the separator of the forced cooling type IB conducting wire, which is configured to directly cool the superconducting wire, a hollow pipe, which is the material of the separator, is wound in an open spiral around the stabilizing base material. The wrapped pipe is pressed against the stabilizing base material to form a flat shape, and at the same time, the pressing force brings the pipe into close contact with the stabilizing base material to form a separator. It is characterized by the fact that it is made to do so.

The method for forming a separator of the present invention will be explained in more detail below.

FIG. 7 is a diagram showing the procedure of a method for forming a separator according to the present invention. As shown in FIG. 7(A), first, a hollow pipe 20 is wound around the outer surface of the stabilizing base material 10 in an open spiral. In this embodiment, a hollow pipe 2
0, which has a circular cross section and has a hollow part 21 inside is used.

Next, the pipe 20 wound around the outer surface of the stabilizing base material 10 as described above is pressed against the outer surface of the stabilizing base material 10 using, for example, a rolling roll. Since the pipe 20 is hollow as described above, it is easily deformed by being pressed in this way and is formed into a flat shape. In this case, the inner surface of the pipe 20 forming the hollow part 21 is
As shown in FIG. 7(B), it is preferable that the inner and outer sides of the stabilizing base material 10 be joined together, since there is no room for deformation later. When deformed when electromagnetic force is applied (when energized), a corresponding dimensional margin is created, causing wire movement. Therefore, crushing the pipe should be done during the manufacturing process and not when electromagnetic force is applied.

In this process, the pipe 20 is stabilized by the stabilizing base material 10.
The outer surface and edges of the In addition, since the hollow pipe 20 has a hollow portion 21, its deformation resistance is small, and the deformation resistance is only 1/3 to 1/20 of that of a normal round wire, so this hollow pipe 20 is used as the stabilizing base material 1o. Even if the stabilizing base material 10 is pressed and molded, no deformation occurs in the stabilizing base material 10.

Therefore, the superconducting wire 11 inside the stabilizing base material 10 will not receive lfl(1).

As explained above, according to the present invention, when forming a separator for a forced cooling superconducting wire, a hollow pipe is used as the material of the separator, and the hollow pipe is wound around a stabilizing base material. After attaching, the separator is formed by pressing against the stabilizing base material, and at the same time, the separator is formed in close contact with the stabilizing base material, thereby preventing the separator from lifting up from the stabilizing base material. Therefore, even if the superconducting wire manufactured in this way is wound into a coil for use in a magnet etc. and energized,
There is no possibility that the stabilizing base material and the superconducting strands therein will be stiffened due to the action of electromagnetic force and that quenching will occur. In addition, since a hollow pipe was used as the material for the separator, even if the hollow pipe was pressed against the stabilizing base material so that it was in close contact with the outer surface of the stabilizing base material, the hollow pipe itself would not deform. Since it is in close contact with the stabilizing base material and absorbing its pressing force, the stabilizing base material itself will not be deformed, and the superconducting wires inside the stabilizing base material will not be damaged.

[Brief explanation of drawings]

1 to 3 are cross-sectional views showing an example of a conventional hollow superconducting wire, FIG. 4 is a cross-sectional view showing an example of a conventional directly cooled fJI superconducting wire, and FIG. 5 is a cross-sectional view showing an example of a conventional directly cooled fJI superconducting wire. 6 is a perspective view showing a stabilizing base material and separator in the superconducting wire of FIG. 5, and FIG. 7 is a perspective view showing an example of the separator forming method of the present invention. It is a perspective view shown step by step. 10... Stabilizing base material, 11... Superconducting wire, 1
3... Outer cover, 14... Cooling medium passage, 15...
・Communication path, 20...pipe, 21...hollow part. Applicant Fujikura Electric Cable Co., Ltd. Agent Patent attorney Takehisa Toyota (and one other person) Figure 1 6C Figure 2 Figure 7 (A) (8) Procedural amendment (Method) % formula % 2. Mandatory name of invention Method for forming separators in cooled superconducting wire 3,
Relationship with the case of the person making the amendment Patent applicant address 1-5-1 Kiba, Koto-ku, Tokyo Name
(518) Fujikura Electric Cable Co., Ltd. 4, Agent address: 803 Futaba Building, 3-4-18 Mita, Minato-ku, Tokyo Telephone: (153) 65915, ゛Date of amendment order: April 26, 1980 (shipment date) 6. Drawings to be corrected 7. Contents of correction 70-

Claims (1)

[Scope of Claims] A plurality of superconducting strands are housed inside a hollow stabilizing base material with a rectangular cross section, and a separator is provided between the stabilizing base material and an outer sheath surrounding it. The separator ensures a continuous cooling medium flow path in the longitudinal direction of the stabilizing base material, and the stabilizing base material has a communication path that communicates between the inside and outside of the stabilizing base material, and the cooling medium flow path is formed in the stabilizing base material. The separator of the forced cooling type superconducting S-wire is configured such that the cooling medium flowing through the channel flows into the gap between the superconducting wires in the stabilizing base material through the communication channel to directly cool the superconducting wires. When forming the separator, a hollow pipe, which is the material of the separator, is wound around the stabilizing base material in an open spiral shape, and the wrapped pipe is pressed against the stabilizing base material. 1. A method for forming a separator in a forced cooling superconducting wire, characterized in that the pipe is formed into a flat shape using the compressor, and at the same time the pipe is brought into close contact with a stabilizing base material by the pressing force to form a separator.