JPS61113217A - Superconductive magnet device - Google Patents

Abstract

PURPOSE:To sharply reduce the number of piping and the connected part and to directly cool the connected part of each superconductive wire using a refriger ant by a method wherein a plurality of inlet parts or outlet parts of a superconductive coil are put together and connected to a refrigerent feeding source using a pipe. CONSTITUTION:The outlet part 10E of the top superconductive coil A is connected to the returning part of a refrigerant feeding source using the first exhaust pipe 11, and an inlet part 10D is connected to the inlet part 10D of the center superconductive coil A through the intermediary of the first connection path 12 respectively. The first connection part 12 is connected to the feeding part of the refrigerant feeding source by the first introducing pipe 13, and on the other hand, the outlet part 10E of the center superconductive coil A is connected to the bottom outlet part 10E through the intermediary of the second connection path 14, and the second connection path 14 is connected to the returning part of the refrigerant feeding source by the second exhaust pipe 15. The outlet part D of the bottom superconductive coil A is connected to the feeding part of the refrigerant feeding source using the second introducing pipe 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a superconducting magnet device configured by laminating iIA conductive coils using forced cooling type superconducting conductors.

[Prior art and its problems] Recently, a hollow stabilizing base material with a substantially rectangular cross section has been developed which is provided to form a refrigerant flow path inside the jacket and allow the refrigerant to flow into the interior. Various forced cooling type superconducting conductors have been proposed, which are constructed by storing a superconducting wire in a container, and are configured so that the superconducting wire can be forcibly cooled by a refrigerant such as supercritical pressure helium flowing through the flow path or the like.

By the way, when this type of superconducting conductor is wound around a bobbin to form a superconducting coil, and a plurality of these superconducting coils are stacked to form a superconducting magnet, the connection between the flow path of each superconducting coil and a refrigerant supply source, Conventionally, the connections between the superconducting wires of each superconducting coil have been configured as shown in FIGS. 11 and 12 for reasons described later.

That is, the connection between the flow path and the refrigerant supply source is as shown in FIG. , and the other is connected to the return part of the refrigerant supply source by the discharge vibrator 3, while the superconducting wires are connected to the vertically adjacent inlet pipe 2 and the discharge vibrator 3 as shown in FIG. The superconducting wires 4 were wrapped around the wires or pasted together and soldered to electrically connect them. By the way, the reason for the above connection is that if the flow paths of the superconducting coils were connected in series, the flow path for the refrigerant discharged from the supply section of the refrigerant supply source to return to the refrigerant supply source would be longer. This is because flow path resistance increases, pressure loss increases, and the refrigerant heated in one superconducting coil is sent directly to other superconducting coils, which is unfavorable for cooling the superconducting wire. This is because the current flowing through the wire must be continuous between each coil.

However, with the above-described structure, each turtle conductive coil 1
Therefore, if there are many layers of superconducting coils 1, the number of vibrators increases, making it difficult to route and connect the vibrators. The transmitted heat also increases, making cooling difficult, and the connection part of the superconducting wire is
Since the connecting portion is located outside the discharge vibrator 3, cooling of the connecting portion is indirect cooling via the peripheral wall of the vibrator 2.3, and there is a problem that cooling tends to be insufficient.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and its purpose is to significantly reduce the number of vibrators that communicate between the superconducting coil and the refrigerant supply source, and to reduce the number of vibrators that communicate between the superconducting wires. An object of the present invention is to provide a superconducting magnet device in which a connection part can be directly cooled by a refrigerant.

[Means for Solving the Problems] The present invention provides for supplying a refrigerant supply source to one of the inlet and outlet portions of the superconducting conductor of each superconducting coil on both ends in the stacking direction. The outlet section is connected to the return section of the refrigerant supply source, and each other inlet section and each outlet section are connected to the inlet section of other adjacent superconducting coils, and the outlet section is connected to the inlet section of another adjacent superconducting coil. In this case, the outlet portions of other adjacent M3 conductive coils are connected to each other by connecting paths, the connecting path connecting the inlet portions to each other is connected to the above-mentioned supply portion, and the connecting path connecting the outlet portions to the above-mentioned return portion, While contacting each,
The superconducting wires of adjacent superconducting coils are connected within the connection path.

[Operation] Since the inlets and outlets of the superconducting conductors are connected by connecting paths, the number of piping is reduced, and the refrigerant flowing through these connecting paths directly cools the connecting portions of the superconducting wires of the superconducting coils.

[Example] Figures 1 to 7 show an example of the present invention.
A superconducting coil A is formed by winding a superconducting conductor 10, which will be described later, around a bobbin, and a superconducting magnet is constructed by stacking a plurality of superconducting coils A (three in this embodiment). The superconducting conductor 10 is made by converting a plurality of superconducting wires 10a made of alloy-based superconducting materials such as Nb-Ti alloy and Nb-Ti-Ta alloy, or compound 71-electronic materials such as Nbz3n, V3Ga, Nb3Ge, etc. The superconducting wire assembly 10A formed using copper, copper alloy,
A stabilizing base material 10B is made of a highly conductive material such as high-purity aluminum or aluminum alloy, and has a substantially rectangular cross section and is made of a hollow stabilizing base material 10B that houses the superconducting wire assembly 10A, and is made of copper, stainless steel copper, titanium, titanium alloy, etc. A refrigerant flow path P is formed between the stabilizing base material 10B and the stabilizing base material 1.
It is a forced cooling type mainly composed of an outer cover 10c having a rectangular cross section and containing an 0B. In the superconducting conductor 10, the stabilizing base material 10B is formed by fitting the channel materials 1011+ and 10t12, each having a trowel-shaped cross section, and the outer surface of each channel material 10b+, 10b2 has both channel materials 10b+, A protrusion 10d is formed so as to protrude outward from the stabilizing base material 10B when the two channel members 10b2 are fitted together, and both channel members 10b+ and 10b2 have both channels curved by winding the superconducting conductor 10 around the bobbin on both side plates of the channel members 10b+ and 10b2. A plurality of slits 10e are formed to facilitate deformation of the materials 10b1 and 10b2, and are located at appropriate positions on the ceiling plate and bottom plate of the channel materials 10b+ and 10bz, facing each other in the width direction of the channel materials 10b+ and 10b2. In the part between the pair of slits 10e, 10e, a protrusion 10d is cut out and a channel material 10b1 is cut out.
．． Through hole 10r through the ceiling plate or bottom plate of 10b2
are formed. And the stabilizing base material 10B
In this case, the outer sheath 1 is made by bringing the protrusion 10d into contact with the inner surface of the outer sheath 10C.
A refrigerant flow path P is formed between the stabilizing base material 10B and the outer sheath 10C, and this flow path P and the stabilizing base material 10B communicate with each other via the through hole 10r. ing.

On the other hand, both ends of the superconducting conductor 10 wound around each bobbin are pulled out from the bobbin, and one end has an inlet part 10D, and the other end has an outlet part 10E. are formed respectively. Note that among the stacked superconducting coils, as shown in FIG.
An exit portion 10E is formed at the top, and a central superconducting coil A
, the inlet section 100 is located at the top, and the outlet section 10 is located at the top.
E is formed in the lower part, and in the lowest superconducting coil A, an inlet part 10D is formed in the lower part, and an outlet part 10E is formed in the upper part. The outlet section 10E of the uppermost superconducting coil A is connected to the return section of the refrigerant supply source through the first discharge pipe 11, and the inlet section 100 is connected to the inlet section 10D of the central superconducting coil A. The first connection path 12 is connected to the supply section of the refrigerant supply source through the first introduction pipe 13, while the outlet section 10E of the central superconducting coil A is connected to the second connection path 12. 14 to the outlet section 10E of the lowermost superconducting coil A.
4 is connected to the return part of the refrigerant supply source by a second discharge pipe 15, and the outlet part 10D of the lowermost superconducting coil A is connected to the supply part of the refrigerant supply source by a second introduction pipe 16. .

One end of the superconducting wire assembly 10A of the top superconducting coil A and one end of the superconducting wire assembly 10A of the central superconducting coil A are connected within the first connection path 12,
The thin end of the superconducting wire assembly 10A of the superconducting coil A in the center and the superconducting wire assembly 10 of the bottom superconducting coil A
One end of A is connected within the second connection path 14.

Note that the connection portion between the first connection path 12 and the first introduction pipe 13 and the connection portion between the second connection path 14 and the second discharge pipe 15 are both configured as described below. First, only the superconducting wire assembly 10A is exposed for a predetermined length from the ends of a pair of opposing superconducting conductors 10.10, and the exposed superconducting wire assembly 10A is divided into two layers. As shown in the dotted lines in the figure or as shown in FIG. It is covered by a connected joint cover K having a rectangular cross section. This joint cover is made of a metal material such as copper, copper alloy, or stainless steel, and is fixed to the end of the superconducting conductor 10.10 by a fixing means such as soldering, silver brazing, or welding. A first connection path 12 (or a second connection path 14) is formed in the joint cover, and a first connection path 12 (or second connection path 14) is formed in the joint cover.
The connection path 12 (or the second connection path 14) is hermetically surrounded. The above-described first inlet pipe 13 (or second discharge pipe 15) is connected to these joint covers K so as to communicate with the inside of the joint covers.

In the superconducting magnet device configured as described above, the refrigerant sent out from the supply section of the refrigerant supply source is introduced into the inlet section 10D of each superconducting coil A via the first introduction pipe 13 or the second introduction pipe 16. The refrigerant is fed as shown by the arrow in FIG. The superconducting wires 10a are cooled by returning the superconducting wires 10a to the return portion of the refrigerant supply source as shown by the arrows in FIG.

Here, the first inlet pipe 13 sends the refrigerant to the two superconducting coils A, and the second discharge pipe 15 allows the refrigerant discharged from the two superconducting coils A to flow, so compared to the conventional superconducting magnet shown in FIG. Therefore, in the apparatus of this embodiment, two pipes can be conveniently omitted.

In addition, in the device of this embodiment, the superconducting wire assembly 10A exposed from the superconducting conductor 10 is divided into two layers and stacked one on top of the other, so the contact area between the superconducting wires 10a is large and electrical connection is achieved. In addition, this connection part is located in the first connection path 12 (or second connection path 14) to the joint cover and is directly cooled by the refrigerant, so the cooling efficiency of the connection part is high. .

Furthermore, since the joint cover airtightly surrounds the first connection path 12 (or second connection path 14), when the device of this embodiment is installed and used in a vacuum chamber, each connection path 12 .14 can be completely separated from the vacuum atmosphere.

By the way, in the above embodiment, the superconducting aggregate 10A
was divided into two layers and overlaid and connected as shown in Fig. 7, but it is also possible to divide only one layer into 2M layers and overlap them so that the other layer is sandwiched between them, as shown in Fig. 8. 311
It is also possible to separate the above parts, overlap them, and connect them.

In addition, the joint cover is made up of - as shown in Figure 9, two channel joints + and K2, and these channel joints are joined with + and K2 as shown in Figure 10. You can also do that. Further, the first introduction pipe 13 and the second discharge pipe, which serve as an inflow path or an outflow path, can provide the same effect not only in the vertical direction of the joint surface 9 but also in the lateral direction.

Note that fixing means such as soldering, silver brazing, welding, etc. are used to connect the channel joints + and K2 to each other and to the superconducting conductor 10.

[Manufacturing Example] The structure of the first embodiment described above is applied to a forced cooling type superconducting magnet device configured by stacking double pancake-shaped superconducting coils, and refrigerant is sent to this superconducting magnet device from a refrigerant supply source. At the same time, a current of 10 KA was passed through the superconducting wire to generate an external magnetic field of 6 tones and a central magnetic field of 10 T. At this time, no abnormalities were observed at the connections of the superconducting wires inside the joint cover, the supply and recovery of refrigerant were not supported, and the superconducting conductors were sufficiently cooled.

[Effects of the Invention] As explained above, according to the present invention, the refrigerant inlet or outlet of the superconducting coils at both ends of the stacked superconducting coils is connected to the refrigerant supply source, and the remaining superconducting coils are connected to the refrigerant supply source. The inlets are connected to each other, and the remaining outlets are connected to each other via connectors, and each of the connecting paths is individually connected to a refrigerant supply source. The wires are connected together, and each of the multiple inlets or outlets of the superconducting coil is connected to the refrigerant supply source through one pipe, so there is only one inlet or outlet. About the section 1
The number of pipes can be significantly reduced compared to conventional devices that require two pipes, and the propagation of heat from heat spots that partially occur when electricity is applied can be kept to a minimum.

Furthermore, since the superconducting wires of the superconducting coils are connected within the connection path, this connection can be directly cooled with a refrigerant, and the cooling efficiency of the connection is high.

[Brief explanation of drawings]

1 to 7 show an embodiment of the present invention,
Figure 1 is a schematic configuration diagram, Figure 2 is a cross-sectional perspective view of the superconducting conductor, Figure 3 is a schematic diagram of the connection path, Figure 4 is a perspective view of the surrounding area of the connection path, and Figure 5 is the same as in Figure 4. 6 is a perspective view of the joint cover, FIG. 7 is a schematic diagram showing the overlapping state of superconducting wires, FIG. 8 is a schematic diagram showing another example of the overlapping state shown in FIG. 7, and FIG. Figure 10 is an exploded perspective view showing another example of the joint cover, Figure 10 is a perspective view showing how the joint cover shown in Figure 9 is used, Figure 11 is a schematic configuration diagram of a conventional superconducting magnet device, Figure 11 is a schematic diagram of a conventional superconducting magnet device, FIG. 12 is a schematic configuration diagram of the connecting portion of the superconducting wire in the configuration diagram shown in FIG. 11. A...Superconducting coil, 10...Superconducting conductor, 10B...Stabilizing base material, 10C...
...Outer cover, 10D...Inlet section, IOE...
...Exit part, 10a...Superconducting wire, P...
...Flow path, 12...First connection path, 14...
...Second connection path. Figure 1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 1O Figure

Claims (1)

[Claims] A superconducting conductor is constructed by housing a superconducting wire in a hollow stabilizing base material having a substantially rectangular cross section, which is provided to form a refrigerant flow path inside the jacket and into which the refrigerant can flow. A superconducting coil is formed by winding the superconducting conductor around a bobbin, and a refrigerant inlet is formed at one end of the superconducting conductor pulled out from the bobbin, and an outlet is formed at the other end, while a plurality of the superconducting coils are stacked. In a superconducting magnet device in which an inlet of each superconducting conductor is connected to a supply part of a refrigerant supply source, and an outlet part of each superconductor is connected to a return part of a refrigerant supply source, each superconducting coil at both ends in the stacking direction Either one of the inlet and outlet of the inlet is connected to the supply part of the refrigerant supply source, and the outlet part is connected to the return part of the refrigerant supply source. The inlet part and each outlet part are connected to the inlet part of another adjacent superconducting coil at the inlet part, and to the outlet part of another adjacent superconducting coil at the outlet part, respectively, through connecting paths. The connecting paths connecting the inlets are connected to the supply section of the refrigerant supply source, and the connecting paths connecting the outlet sections are connected to the return section of the refrigerant supply source, while the superconducting wires of the adjacent superconducting coils A superconducting magnet device characterized in that the two magnets are connected to each other within the above connection path.