JPH09115358A - Superconducting stranded wire and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a stranded wire collapse due to a wire movement. SOLUTION: A plurality of superconducting element wires 11 are stranded around a stabilizing core wire 10, thereby forming a primary stranded wire 12. Then, six primary stranded wires 12 so formed are stranded and grouped. Furthermore, heat is applied to the primary stranded wires 12 in this state, and solder 13 is melted to infiltrate a gap between each wire for jointing. As a result, a secondary stranded wire 14 is formed. According to this construction, the six primary stranded wires 12 are integrated with one another, with the solder 13 existing along the external surface of each of the primary stranded wire 12, thereby allowing an easy stranded wire bending work. Also, the occurrence of a wire movement is prevented, and the prevention of a stranded wire collapse is ensured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting stranded wire manufactured by using a stranded wire bonded with solder or a solder-plated wire, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a superconducting secondary stranded wire,
As shown in FIG. 4, solder-plated strands 1 (8 in FIG. 4) including one or several superconducting strands are twisted together and then joined together by solder 3 to be integrated. The primary twisted wire 2 is created by. Next, the six twisted primary stranded wires 2 having such a configuration are twisted together to obtain the secondary stranded wire 4.

Further, as shown in FIG. 5, with respect to the configuration of FIG.
A method is also used in which the secondary twisted wire 4 is obtained by fusion bonding with the solder 3a so that the cross-sections of the primary twisted wire 2 and the entire cross-section become a block shape. Further, as shown in FIG. 6, a primary stranded wire 2 is prepared by using a solder-plated wire 1 containing one or several superconducting wires, and several primary stranded wires 2 are stranded to form a primary stranded wire 2. The secondary twisted wire 4 is obtained by joining the twisted wires 2 with the solder 5 to integrate them.

Further, there is a technique disclosed in Japanese Patent Laid-Open No. 63-193409. The configuration shown here will be described with reference to FIGS. First, as shown in (a), the outer surface of the core wire 6 is plated with solder 7, and the core wire 6 is
A plurality of strands 8 are twisted around each other. Then, if the whole twisted wire is compressed, a single superconducting twisted wire having a circular cross section can be obtained as shown in FIG. If the solder of the solder plating 7 is melted by heating in this state, the core wire 6 and the element wire 8 are joined and integrated, and the secondary twisted wire 4 is obtained.

[0005]

In the prior art of FIGS. 5 and 6 described above, since the primary twisted wires are not joined by solder or the like, the movement of the wires (wire movement) is prevented in the superconducting state. It is impossible to do so, and there is a possibility of causing a quench (a state where the superconducting state is broken). Furthermore, when wound around a superconducting coil or the like, the twisted wire may be loosened.

Further, since the primary stranded wire is joined by solder, bending of the stranded wire is not easy, and there is a problem that workability is extremely poor when winding a superconducting coil or the like. Further, in the conventional technique of FIG. 7, since the solder of the solder plating 7 is confined inside, the shape that can be manufactured is limited. The present invention has been made in view of the above circumstances of the prior art, prevents wire movement, facilitates winding processing, does not easily cause twisted wires, and can be manufactured in various shapes. It is an object of the present invention to provide a superconducting stranded wire having excellent properties and a method for producing the same.

[0007]

To achieve the above object, the present invention provides a superconducting stranded wire including a secondary stranded wire in which a plurality of primary stranded wires in which a plurality of superconducting element wires are stranded are stranded. , The plurality of superconducting wires of the primary stranded wire are solidified with solder, the plurality of primary stranded wires are solidified with solder at a contact portion, and are flexible in a gap of a non-contact portion. It is possible to have a solder void portion that causes the property.

Further, a plurality of primary stranded wires in which a plurality of elemental wire structures containing at least one superconducting elemental wire are fixed by solder are twisted, and this is heated to melt and melt the solder. By solidifying the solder, the primary stranded wires can be joined together to form a secondary stranded wire. Further, as the superconducting element wire, a wire which has been previously plated with solder can be used.

Further, a plurality of primary twisted wires using superconducting wires that have been solder-plated in advance are twisted into a twisted wire,
This can also be achieved by including a step of placing the stranded wire in a heating atmosphere to melt the solder plating, and solidifying the melted solder to join the primary stranded wires to each other to form a secondary stranded wire. In this case, a plurality of elemental wire structures including at least one superconducting elemental wire are twisted and fixed with solder to form a primary twisted wire, and a plurality of the primary twisted wires are twisted into a secondary twisted wire, A plurality of secondary twisted wires are twisted together to form a tertiary twisted wire, the tertiary twisted wire is heated to melt the solder of the primary twisted wire, and the secondary twisted wire is contacted by solidification of the melted solder. Can be joined.

The superconducting element wire may be one which has been previously plated with solder. According to the above-mentioned means, a secondary twisted wire is formed by twisting a plurality of strands of a primary twisted wire obtained by twisting a wire structure including at least one superconducting wire, and further twisted wires are formed. If soldering is used to fix the wire, the solder will spread thinly on the surface of the secondary stranded wire, and a void will be formed in the center surrounded by the secondary stranded wire. There is no structure. Therefore, bending of the twisted wire is facilitated, and workability is not impaired even when winding a superconducting coil or the like. In addition, wire movement is prevented and twisted wire breakage is less likely to occur.

The solder plating applied to the superconducting wires in advance is
Ensure the splicing of the primary stranded wire after it is stranded. When creating a secondary stranded wire, use a superconducting wire that has been pre-solder plated
Soldering for joining the secondary strands to each other can be performed by using the solder plating of the superconducting wires, which allows each strand to be wound without supplying solder from the outside in the process of completing the superconducting wires. In addition to being able to join, the bending of the twisted wire is easy, and workability is not impaired even when winding a superconducting coil or the like. In addition, wire movement is prevented and twisted wire breakage is less likely to occur.

Further, based on a primary stranded wire obtained by twisting a stranded wire structure containing at least one superconducting element wire, a plurality of stranded wires are twisted to form a secondary stranded wire, and then a secondary stranded wire is further formed. A third twisted wire is formed by twisting a plurality of the wires and soldering them together. In this way, by sequentially gathering the twisted wire bundle, bending of the twisted wire is facilitated, and even when winding a superconducting coil or the like, workability is not impaired and wire movement is prevented. ,
In addition to the effect that the twisted wire is less likely to collapse, it becomes possible to make a superconducting wire of any size.

In this case, if the primary twisted wires are soldered to each other at the stage of the secondary twisted wires, the twisted wire work for forming the secondary twisted wires is facilitated, and the solder is wetted surely and sufficiently. be able to. Similarly, the solder plating applied to the superconducting wires in advance can be fixed to the core wire, so that the unraveling of the primary stranded wire can be eliminated and the work in the subsequent steps can be performed easily and quickly.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of a superconducting stranded wire manufactured by a manufacturing method according to the present invention. Eight superconducting wires 11 (solder plated) surrounding the stabilized core wire 10 plated with solder.
Are twisted together, and in this state, the eight superconducting wires 11 are separately supplied (for example, using a solder bath) with the solder 13.
The primary stranded wire 12 is completed by joining Six primary stranded wires 12 having such a structure are prepared, and these are twisted together. While maintaining this state, by heating the whole at a solder melting temperature for a short time, the solder 13 around the primary twisted wire 12 melts and melts between the primary twisted wires 12, and the secondary twisted wire 14 is completed. To do. In addition, 15 is a space | gap produced in the center part surrounded by the some primary twisted wire 12 at the time of melt | melting between the primary twisted wires 12.

If the melting temperature of the solder is too high, the performance of the superconducting wire 11 is deteriorated.
It is desirable to heat at about 0 ° C. Further, if heating is performed for a long period of time, the solder will melt down, so it is desirable to shorten the time to about 1 to 5 minutes. Furthermore, when heat treatment is performed in a state of being wound on a bobbin, the secondary twisted wires also come into close contact with each other, so it is necessary to provide a heating zone between the winder and the delivery machine to perform heat treatment. Further, if the heat treatment is performed in a state where the twisted wires are loose, the dimensions will be out of order, so it is necessary to apply a certain tension to the heat treatment work.

As described above, according to the embodiment shown in FIG.
Since the stabilized core wire 10 and the superconducting element wire 11 are joined with the solder 13 after forming the primary twisted wire 12, the primary twisted wires 12 are in close contact with each other and are electrically and thermally coupled. Further, since the primary stranded wires 12 are adhered to each other by the final heating, unraveling of the stranded wires and movement of the superconducting wires in the superconducting state (wire movement) are prevented.

Since the secondary stranded wire 14 is in close contact with the solder 13 only at the portion where the primary stranded wire 12 is adjacent, winding work can be easily performed when winding the stranded wire. In addition,
Superconducting element wire 11 and stabilizing core wire 10 by primary stranded wire 12
The number and the arrangement of are not limited to the above-mentioned embodiment, and can be arbitrarily changed. Further, since the solder 13 supplied from the outside is used in the present embodiment,
Solder plating on the superconducting element wire 11 and the stabilizing core wire 10 is not always necessary.

FIG. 2 is a sectional view showing a second embodiment of a superconducting stranded wire manufactured by the manufacturing method of the present invention. The stabilizing core wire 10 is preliminarily subjected to solder plating, and a plurality of (eight in this embodiment) the stabilizing core wire 10 is used as a center.
By twisting the superconducting wires 11, the primary stranded wire 12 in the end-joined state is obtained. A plurality (six in the present embodiment) of the primary twisted wires 12 are twisted together, and the whole is heated in this state to melt the solder 13a coated on the surface of the superconducting element wire 11 to thereby melt it. The solder penetrates between the superconducting wires 11 and between the primary stranded wires 12 to complete the secondary stranded wire 14 having a substantially rectangular cross section.

In the present embodiment, the amount of solder coated on the entire surface is small (because the solder 13 is not used as in the embodiment of FIG. 1) in comparison with the configuration of FIG. 14
The surface shape of indicates the shape according to the outer diameter of the superconducting element wire 11. Further, in the center of the portion where the four primary twisted wires 12 are joined, a larger void 16 that is more intricate than that in the embodiment of FIG. 1 is formed, and bending is further facilitated.

Also in the present embodiment, the number and arrangement of the superconducting element wire 11, the primary twisted wire 12 and the stabilizing core wire 10 are not limited to those in the above embodiment, and may be arbitrarily changed. it can. FIG. 3 is a sectional view showing a third embodiment of a superconducting stranded wire manufactured by the manufacturing method of the present invention.

Eight solder-plated superconducting element wires 11 are twisted together so as to surround the stabilized core wire 10 which is plated with solder, and in this state, eight superconducting wires 11 are separately supplied by the solder 13. The primary twisted wire 12 is completed by joining the strands 11. The primary stranded wire 12 having such a structure is
Prepare a book, place one in the center, and twist the other six around this one. If this state is maintained and the whole is joined using solder 13, the secondary stranded wire 1 with a circular cross section
4 is completed. Next, a plurality (6 in this embodiment) of the secondary twisted wires 14 thus obtained are twisted together.
While maintaining this state, the secondary twisted wires 14 are joined to each other by heating for a short time in the heating atmosphere of the solder melting temperature, and the tertiary twisted wires 17 are completed. Two large voids 18 are formed at the center of the portion where the four stranded secondary wires 14 are joined.

Also in this embodiment, the number and arrangement of the superconducting element wire 11 by the primary twisted wire 12, the stabilizing core wire 10, the primary twisted wire 12, and the secondary twisted wire 14 are the same as those in the above embodiment. It is not limited and can be changed arbitrarily. Further, the number of times of solder plating and soldering up to the secondary twisted wire 14 can be set to any number.

[0023]

As described above, according to the present invention, there is no limitation in shape and size, and a superconducting wire having excellent flexibility can be obtained. A plurality of primary wire strands in which a plurality of strand structures including at least one superconducting element wire are fixed by solder are twisted together, and this is heated to melt the solder, and the solder is the primary twisted wire. Since the secondary stranded wires are formed by joining the primary stranded wires to each other so as to be interposed along the outer surface,
Bending of the stranded wire is facilitated, and workability is not impaired even when winding a superconducting coil or the like. In addition, wire movement is prevented and twisted wire breakage is less likely to occur.

Further, a plurality of primary stranded wires using superconducting wires preliminarily solder-plated are placed in a heated atmosphere in a twisted state, the solder plating is melted, and the solder is the primary stranded wires. By forming a secondary stranded wire by joining the primary stranded wires to each other in a state of interposing along the outer surface,
In the process of completing the superconducting wire, each stranded wire can be joined without supplying solder from the outside, and the bending work of the stranded wire becomes easy, even when winding a superconducting coil etc. There is no loss of sex. In addition, wire movement is prevented and twisted wire breakage is less likely to occur.

Further, a plurality of the primary stranded wires in which a plurality of strand structures containing at least one superconducting element wire are fixed by solder are twisted together, and this is heated to melt the solder, and the solder is A secondary stranded wire is formed by joining the primary stranded wires to each other along the outer surface of the primary stranded wire to form a tertiary stranded wire by twisting a plurality of the secondary stranded wires, By heating in this state to melt the solder coated on the primary twisted wires and joining the secondary twisted wires, bending of the twisted wires is facilitated, and the winding of the superconducting coil or the like can be formed. Even when it is carried out, in addition to the effects that workability is not impaired, wire movement is prevented, stranded wire breakage is less likely to occur, etc., it becomes possible to make a superconducting wire of any size.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a superconducting stranded wire manufactured by a manufacturing method of the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of a superconducting stranded wire manufactured by the manufacturing method of the present invention.

FIG. 3 is a cross-sectional view showing a third embodiment of a superconducting stranded wire manufactured by the manufacturing method of the present invention.

FIG. 4 is a sectional view showing a first example of a superconducting stranded wire manufactured by a conventional method.

FIG. 5 is a cross-sectional view showing a second example of a superconducting stranded wire manufactured by a conventional method.

FIG. 6 is a sectional view showing a third example of a superconducting stranded wire manufactured by a conventional method.

FIG. 7 is a cross-sectional view showing a fourth example of a superconducting stranded wire manufactured by a conventional method, in which (a) is an initial manufacturing state and (b) is a sectional view.
Indicates the state just before completion.

[Explanation of symbols]

 10 Stabilized core wire 11 Superconducting wire 12 Primary stranded wire 13 Solder 14 Secondary stranded wire 17 Tertiary stranded wire

Claims (6)

[Claims] 1. A superconducting stranded wire including a secondary stranded wire in which a plurality of primary stranded wires in which a plurality of superconducting wires are twisted are stranded, wherein the plurality of superconducting wires in the primary stranded wire are solidified by soldering. The superconducting stranded wire is characterized in that the plurality of the primary stranded wires are solidified with solder at a contact portion, and that a solder void portion that causes flexibility is provided in a gap of a non-contact portion. 2. A plurality of primary stranded wires in which a plurality of elemental wire structures including at least one superconducting elemental wire are fixed by solder are twisted together, and this is heated to melt the solder,
A method for producing a superconducting stranded wire, comprising joining the primary stranded wires to each other by solidifying the molten solder to form a secondary stranded wire. 3. The method for producing a superconducting stranded wire according to claim 2, wherein the superconducting element wire is preliminarily solder-plated. 4. A plurality of primary stranded wires using a superconducting element wire preliminarily solder-plated are twisted together to form a stranded wire, and the stranded wire is placed in a heating atmosphere to melt and melt the solder plating. A method of manufacturing a superconducting stranded wire, comprising the step of joining the primary stranded wires to each other by solidifying the solder to form a secondary stranded wire. 5. A plurality of elemental wire structures including at least one superconducting elemental wire are twisted together and solidified with solder to form a primary annual stranded wire, and a plurality of the primary stranded wires are stranded to form a secondary stranded wire. , A plurality of the secondary twisted wires are twisted to form a tertiary twisted wire, the tertiary twisted wire is heated to melt the solder of the primary twisted wire, and the secondary twisted wire is solidified by melting the solder. A method of manufacturing a superconducting stranded wire, which comprises joining at a contact portion. 6. The method for producing a superconducting stranded wire according to claim 5, wherein the superconducting element wire is preliminarily subjected to solder plating.