JPS605533Y2 - superconducting coil - Google Patents

Description

[Detailed Description of the Invention] This invention connects superconducting wires via an auxiliary splicing machine to form a superconducting coil, and particularly relates to the structure of the auxiliary splicing machine.

Generally, a superconducting coil used as a magnetic field generator is constructed by winding a superconducting wire many times, and an example thereof is a pancake-shaped superconducting coil as shown in FIG.

In FIG. 1, a superconducting coil 1 is a pancake coil 100 in which a superconducting wire 2 is wound with a spacer 3 between turns.
A plurality of ... 102 are stacked and fixed in the winding frame 5 via the interlayer spacer 4, and the superconducting wire 2 is electrically insulated both between turns and between the layers by the interturn spacer 3 and the interlayer spacer 4, and the superconducting wire 2 is The spacer 4 forms a gap 41 through which a cooling medium such as liquid helium flows.

This gap 41 has the role of allowing bubbles of the cooling medium generated on the surface of the superconducting wire 2 to escape, and the role of supplying the cooling medium.

Note that the pancake coil 100 in the figure is a flatwise wound pancake coil.

Figure 2 shows the pancake coil 100.10 in Figure 1.
1, the superconducting wire 22 of the pancake coil 100 is bent edgewise to connect the superconducting wire 23 of the adjacent pancake coil 101.
and are joined by solder at the flat surface 9.

Also, FIG. 3 shows a configuration in which the conventional superconducting wire connection part 62 is applied to an edge-size wound pancake-type superconducting coil. FIG. 2 is a perspective view of a portion connected to a superconducting wire 23 of FIG.

In this way, the conventional electromotive conducting wire connections 61 and 62 in FIGS. 2 and 3 are made by directly soldering one side of the superconducting wires 22 and 23 to each other, and literally serve to flow current. When connecting superconducting wires, the following functions are required in addition to simply allowing current to flow.

That is, since the connecting portion of the superconducting wire is not in a superconducting state, Joule heat generation occurs.

If this Joule calorific value is large, the temperature of the connection portion will rise above the critical temperature of the superconducting wire, causing instability of the superconducting coil.

In order to suppress Joule heat generation as much as possible, the connection portion must be lengthened to lower the connection resistance, and it must be sufficiently cooled with a cooling medium such as liquid helium.

Therefore, in the connection parts 61 and 62 of conventional superconducting wires, no consideration is given to quickly removing the Joule heat generated at the solder joints, and in order to reduce the connection resistance, the solder joints must be made over a considerable length. For example, a loKA class conductor requires a length of several meters.

The loKA class superconducting wire used for large-sized items such as superconducting coils for nuclear fusion toroidal coils has a cross-sectional dimension of 20
Since the conductor is large in size, measuring approximately 30 mm x 30 m+y+, it has the drawback that bending and soldering operations as shown in FIGS. 2 and 3 are not easy.

Prior art techniques have been developed with the aim of overcoming these conventional drawbacks.

That is, as shown in FIG. 4, by connecting the connecting portions 63 of the superconducting wires 22 and 23 via the auxiliary joint machine 31, the Joule heat generated at the connecting portions is quickly removed, the cooling effect is increased, and the connection resistance is reduced. However, as electric capacity increases, this requirement is becoming more and more important.

This idea was made in view of the above requirements.
A flat plate part that joins the auxiliary joint machine interposed at the connection part of the superconducting wire to either side of the superconducting wire, and a protruding part that protrudes from approximately the center of this flat plate part and joins to the other surface of the superconducting wire. The purpose of the present invention is to provide a superconducting coil which has an excellent cooling effect and a greatly reduced connection resistance.

An embodiment of this invention will be described below with reference to the drawings.

Referring to FIG. 5, reference numeral 41 denotes an auxiliary joint machine made of, for example, oxygen-free copper, which has good conductivity, and includes a flat plate part 41a and a flat plate part 41 to be joined to the edge surfaces of the superconducting wires 22 and 23, respectively.
It consists of a protrusion 41b that protrudes from approximately the center of 1a and is held between the flat surfaces of the superconducting wires 22.23, and is soldered to the superconducting wires 22.23.

42 is a gap formed between the flat surfaces of the superconducting wires 22 and 23 in which the protrusion 41b is held; 43 is an auxiliary joint machine 4;
1, and these 22, 23.41
．． 43 constitutes a connecting portion 64.

Next, the operation of the embodiment configured as described above will be explained.

The current flowing between both superconducting wires 22 and 23 is the auxiliary junction machine 4.
1 only.

At this time, Joule heat is generated in the connection part 64, but this heat is quickly removed by a cooling medium such as liquid helium existing around the connection part 64 via the auxiliary joint machine 41.

Note that the through hole 43 serves as a heat dissipation window and further improves the cooling effect.

In this way, in the connection portion 64, the cooling effect per unit connection length is significant and the connection resistance is reduced, so the connection length can be shortened, resulting in a significant reduction in the working time required for connection.

It goes without saying that it also becomes easier in terms of bending work, soldering work, etc.

Furthermore, a flat plate part 41a for joining the auxiliary joint machine 41 to the edge surfaces of the superconducting wires 22 and 23, and this flat plate part 4
1a and a protrusion 41b that protrudes from the center of the superconducting wire 22.23 and is held between the flat surfaces of the superconducting wires 22.23, so that the current flowing between both the superconducting wires 22.23 is
The connection resistance can be reduced because the flow passes through both the edge surface and the flat surface via the protruding portion 41b, and the Joule heat generated by the connection resistance on the edge surface is absorbed by the liquid helium around the flat plate portion 41a, such as through the through hole 43. At the same time, the Joule heat generated by the connection resistance of the flat surface is efficiently cooled by the liquid helium in the through hole 43 and the gap 42.

In the above embodiments, a pancake-shaped superconducting coil has been described, but other types such as a disk-shaped superconducting coil may be used, and similar effects can be achieved.

As described above, according to this invention, the auxiliary joining machine interposed at the connection part of the superconducting wire is connected to the flat plate part that joins to either side of the superconducting wire, and the flat plate part protrudes from approximately the center of this flat plate part. By constructing the superconducting coil with a protrusion that is sandwiched and joined between the flat surfaces of the superconducting wire, it is possible to provide a superconducting coil with excellent cooling effect and greatly reduced connection resistance.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway perspective view of a flatwise wound pancake type super double coil, Figure 2 is a perspective view of a conventional superconducting wire connection between flatwise wound pancake coils, and Figure 3 is a conventional edgewise wound A perspective view showing a connection part of a pancake superconducting coil, FIG. 4 is a perspective view showing a connection part of an example of a superconducting coil in the prior art, and FIG. 5 is a perspective view showing a connection part of an example of a superconducting coil in this invention. It is a diagram. In the figure, 22 and 23 are electromotive conductors, 41 is an auxiliary joint machine, 41a is a flat plate part, 41b is a protrusion part, 42 is a gap, and 4
3 is a through hole, and 64 is a connecting portion. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (3)

[Scope of utility model registration request] (1) In a device in which the superconducting wires are connected via an auxiliary joint machine, the auxiliary joint machine connects a flat plate part to be joined to either side of the superconducting wire, and A superconducting coil characterized in that it has a protrusion that protrudes approximately in the center and joins the other surface of the superconducting wire. (2) The superconducting coil according to claim 1, wherein one surface of the superconducting wire is an edge surface and the other surface is a flat surface. (3) The superconducting coil according to claim 1 or 2, wherein the auxiliary joint machine has a plurality of through holes.