JP2011238509A - Connection method and structure for superconducting wire rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a structure for connecting a superconducting wire rod which has sufficient flexibility and of which the tip is prevented from being floated up and peeled off.SOLUTION: In the method for connecting the superconducting wire rod, both terminal parts of two tape-shaped superconducting wire rods are overlapped via a solder layer and connected to each other. Furthermore, in the method for connecting the superconducting wire rod, the tip of the superconducting wire rod forms the upper bottom, a line orthogonal to the center line of the superconductive wire rod forms the lower bottom, the upper bottom and the lower bottom form the both terminal parts of the superconducting wire rods into a trapezoidal shape formed by connecting one side edge of the superconducting wire rod and the other side edge inclined to the center line of the superconducting wire rod, the both terminal parts are overlapped with each other so that the both side edges of the superconducting wire rods inclined to the center line become parallel, and the both superconducting rod wires are connected to each other. The structure for connecting the superconducting wire rods by this connection method is provided.

Description

  The present invention relates to a superconducting wire connecting method and connecting structure, and more specifically, by superposing the ends of two tape-shaped superconducting wires and joining them together using solder (splice), the length of the superconducting wire is increased. The present invention relates to a superconducting wire connecting method and a connecting structure.

  When producing a superconducting cable for a superconducting device, a superconducting coil, or the like, a long superconducting wire is required. In general, a plurality of superconducting wires are sequentially connected to achieve a long length. Thus, by sequentially connecting a plurality of superconducting wires, even a superconducting wire having a short length and a different length can be used effectively, so that the yield of the superconducting wire can be substantially 100%. It becomes possible, and a significant cost reduction can be achieved.

  As a method of sequentially connecting a plurality of superconducting wires, various proposals have been made, but at present, a method called an overlap type in which terminal portions are overlapped and connected by solder has become mainstream (for example, Patent Document 1).

  However, in the conventional overlap type, soldering is performed simply by overlapping the end portion of the superconducting wire, so the area of the overlap portion increases, and the amount of necessary solder increases accordingly. Then, there was a problem that the connection part became hard. When such a splice wire is wound around a former such as a cable, a connection portion that is hard and not flexible is lifted from the former, which adversely affects the superconducting characteristics.

  In order to reduce the area of the overlap portion and to reduce the amount of solder used and to exhibit flexibility, for example, as shown in FIG. It has been proposed to make the triangle thinner as it goes.

Japanese Patent Laid-Open No. 4-160771

  However, if the terminal portion has a triangular shape as described above, it is difficult to sufficiently spread the solder to the tip portion, and thus the tip portion of the terminal portion may not be attached. When the adhesion is insufficient, there is a problem that the tip of the terminal portion is lifted and easily peeled off when being wound around the former. In particular, when the inclination angle with respect to the center line of the superconducting wire is made smaller to make it more acute and the length of the terminal portion is made longer, this tendency is noticeable.

  In view of the above problems, an object of the present invention is to provide a superconducting wire connecting method and a connecting structure that have sufficient flexibility and the tip does not lift and peel off.

  As a result of diligent research, the present inventor has found that the above problems can be solved by the invention shown in the following claims, and has completed the present invention. Hereinafter, each bill will be described.

The invention described in claim 1
A superconducting wire connecting method in which both end portions of two tape-shaped superconducting wires are overlapped and connected via a solder layer,
The tip of the superconducting wire forms an upper base, a line perpendicular to the center line of the superconducting wire forms a lower base, the upper base and the lower base are one side edge of the superconducting wire, and the superconducting wire In the trapezoidal shape connected by the other side edge inclined with respect to the center line, both ends of the superconducting wire are formed,
A superconducting wire connecting method, characterized in that both superconducting wires are connected by overlapping the both ends so that the side edges of both superconducting wires inclined with respect to the center line are parallel to each other. is there.

  In the invention of this claim, the terminal portion of the superconducting wire that overlaps is formed in a trapezoidal shape. This trapezoidal shape is a shape in which the tip portion of the triangular terminal portion is not provided. For this reason, as in the case of the triangular shape, it becomes thinner as it goes to the tip, and the bending characteristics are improved in the overlapping portion where the end portions overlap each other, so that sufficient flexibility can be exhibited.

  The triangular shape does not have a tip that makes it difficult to spread the solder sufficiently, so that the problem that the solder cannot be adhered to the tip is solved, and the solder is also spread enough to the tip. The tip of the terminal portion is lifted and does not peel off.

The invention described in claim 2
2. The superconducting wire connecting method according to claim 1, wherein the length of the upper base is formed to be 1/2 to 1/15 of the width of the superconducting wire.

  If the length of the upper base is made too long, it will be difficult to fully exhibit the flexibility. On the other hand, if the length of the upper base is too short, it becomes difficult to spread the solder sufficiently. The preferable length of the upper base examined from the above viewpoint is 1/2 to 1/15 of the width of the superconducting wire.

The invention according to claim 3
The both terminal parts are overlapped so that the distance between the upper bases of both terminal parts may be less than twice the length of the terminal part. This is a method of connecting superconducting wires.

  When overlapping both terminal parts, if the distance between the upper bases of both terminal parts is set to less than twice the length of the terminal part, the area of the overlapping part can be reduced, so use of solder The amount can be reduced. As a result, it is possible to prevent the overlapping portion from becoming hard and to exhibit a sufficient flexibility, and it does not float and peel off.

The invention according to claim 4
A superconducting wire connecting structure, wherein the superconducting wire is connected by the superconducting wire connecting method according to any one of claims 1 to 3.

  In the invention of this claim, the connection structure of the superconducting wire is formed by using the connection method of the superconducting wire shown in claims 1 to 3, so that the connection resistance does not increase, and the former There is no problem that the connecting portion is lifted and peeled off when it is wound around the wire, and the insulating tape wound around the outside of the wire is broken.

  According to the present invention, it is possible to provide a connection method and a connection structure for a superconducting wire that has sufficient flexibility and does not lift off and be peeled off.

It is a perspective view which shows the connection structure of the superconducting wire of one embodiment of this invention. It is a top view which shows the terminal part of the superconducting wire of one embodiment of this invention. It is a top view explaining the overlap length of the connection structure of the superconducting wire material of one embodiment of the present invention. It is a top view which shows the terminal part of the conventional superconducting wire.

  Hereinafter, the present invention will be described based on embodiments with reference to the drawings.

  FIG. 1 is a perspective view showing a connection structure of a superconducting wire according to an embodiment of the present invention, and FIG. 2 is a plan view showing a terminal portion of the superconducting wire according to an embodiment of the present invention.

  As shown in FIG. 1, the superconducting wire connecting structure is configured by superimposing both terminal portions 1 of two tape-shaped superconducting wires T to be connected and connecting them using solder. And this superconducting wire connecting structure is formed by the following superconducting wire connecting method.

  First, the terminal part 1 of the superconducting wire T is formed in a trapezoidal shape. As shown in FIG. 2, the trapezoidal shape is such that the tip of the superconducting wire T forms the upper base 1a, the line orthogonal to the center line C of the superconducting wire T forms the lower base 1b, and the upper base 1a and the lower base 1b Are connected by one side edge 1c of the superconducting wire T and the other side edge (hereinafter referred to as "slanted side") 1d inclined at an angle θ with respect to the center line C of the superconducting wire T. .

  Then, the two trapezoidal terminal portions 1 of the two superconducting wires T are overlapped and connected using solder so that the hypotenuses 1d are parallel to each other.

  Note that the trapezoidal terminal portions 1 of the two superconducting wires T to be connected are set to have the same shape and dimensions.

  By connecting the superconducting wire T as described above, the solder can be sufficiently distributed to the tip of the terminal portion 1 while maintaining flexibility, and the tip of the terminal portion 1 is prevented from being lifted off and peeled off. it can.

  The trapezoidal terminal portion 1 is appropriately set according to the required superconducting characteristics and the like, but in order to ensure a sufficiently large area of the connecting portion and improve flexibility, the tip angle θ Is preferably 10 degrees or more and less than 90 degrees. Further, the length of the upper base is preferably set to 1/2 to 1/15 of the width W of the superconducting wire T.

  FIG. 3 is a plan view for explaining the overlap length L1 of the superconducting wire connecting structure according to the embodiment of the present invention. As shown in FIG. 3, when connecting a superconducting wire T having a width W, the terminal portions 1 are overlapped so that the hypotenuses 1 d of both terminal portions 1 are parallel to each other.

  As shown in FIGS. 3A and 3B, when the overlap length L1 is twice the length L of the terminal portion 1, the connection area can be increased, so that the electrical resistance of the connection portion is sufficient. Can be made smaller. In addition, since the superconducting wire T is overlapped with W at the central portion of the connection portion and smaller than W at the other portions, the bending characteristics and flexibility can be maintained.

  Further, when the overlap length L1 is less than twice the length L of the terminal portion 1 as shown in FIG. 3C, the area of the connection portion is reduced and the electrical resistance is increased, but the bending characteristics, The suppleness can be further improved.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to said embodiment. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

1 terminal portion 1a upper base 1b lower base 1c side edge 1d side edge (slanted side)
θ Angle of hypotenuse with respect to center line of superconducting wire C Center line of superconducting wire L1 Overlap length L Length of terminal portion T Superconducting wire W Width of superconducting wire

Claims (4)

A superconducting wire connecting method in which both end portions of two tape-shaped superconducting wires are overlapped and connected via a solder layer,
The tip of the superconducting wire forms an upper base, a line perpendicular to the center line of the superconducting wire forms a lower base, the upper base and the lower base are one side edge of the superconducting wire, and the superconducting wire In the trapezoidal shape connected by the other side edge inclined with respect to the center line, both ends of the superconducting wire are formed,
A method of connecting superconducting wires, wherein both the superconducting wires are connected by overlapping the terminal portions so that the side edges of both superconducting wires inclined with respect to the center line are parallel to each other.   2. The method of connecting superconducting wires according to claim 1, wherein the length of the upper base is formed to be 1/2 to 1/15 of the width of the superconducting wire.   The both terminal parts are overlapped so that the distance between the upper bases of both terminal parts may be less than twice the length of the terminal part. Superconducting wire connection method.   A superconducting wire connecting structure, wherein the superconducting wire is connected by the method for connecting a superconducting wire according to any one of claims 1 to 3.

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