JPS6173308A - Superconductive magnet - Google Patents

Abstract

PURPOSE:To press surely a superconductive wire by fixing a ring protecting plate covering the peripheral face of the most peripheral portion to an outer marginal portion with having predetermined space from the most peripheral portion of a superconductive wire, by screwing screw shafts into plural screw holes formed along a round direction on a protecting plate, and by providing a presser plate abutting on the superconductive wire on the top end. CONSTITUTION:After a bobbin 10 is formed through fixing a ring flange plate 10B on both ends of a cylindrical winding drum 10A, superconductive wires 11 and 12 standing in two wires along the direction of the center shaft of a winding drum 10A are wound. A ring protecting plate 13 covering the most peripheral portions 11a and 12a are fixed having predetermined spaces from the most peripheral portions 11a and 12a of the superconductive wires 11 and 12 in the most peripheral portion of the flange plate 10B. After the protecting plate 13 is formed through screw-stopping a semicircle substrate 13A on two flange plates 10B, the superconducting lines 11 and 12 are drawn through the entrance 14. After presser screws 15 are screwed into plural screw holes 13a provided on the protecting plate 13, the presser plate 16 fixed on the top end presses the superconductive wires 11 and 12.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to a superconducting magnet in which a superconducting wire is wound around a winding drum having flanges on both sides, and in particular, a superconducting magnet that holds the superconducting wire so that it does not move. It concerns superconducting magnets with high stability.

"Prior art" When the superconducting magnet is energized, the structure is configured to prevent the superconducting wire wrapped in winding 11ii4 from moving due to electromagnetic force, and preventing the superconducting wire from being biased to the outside of the winding drum and causing it to swell. Conventional examples of superconducting magnets shown in Figures 6 to 9
The superconductive magnet shown in the figure is known.

The super-α-conducting magnet shown in FIG. 6 is made by pouring epoxy resin around a superconducting wire 2 wound around a bobbin 1a, solidifying it, and fixing the superconducting wire 2 with an epoxy resin layer 3. It is constructed.

The superconducting magnet shown in FIG.
It is constructed by fixing a superconducting wire by winding a wire 5 such as a wire (4, etc.).

In the superconducting magnet shown in FIGS. 8 and 9, a high-strength non-magnetic stainless steel (SO8304, etc.) band 8 is wound around the outermost circumference of four superconducting wires 7 wound around a bobbin 6, and both ends of the band 80 are connected via bolts 9. This bolt 9
Tighten the superconducting wire 7 with the band 8 by turning t4.
It has been accomplished.

Chi is caused by movement of the wire or sudden movement of magnetic flux.

Therefore, with regard to the stability of superconducting magnets, it is first necessary to prevent mechanical movement of the wire. In the superconducting magnet shown in FIG.
Although it becomes possible to block the movement of the superconducting gland 2 because it is buried in the water, Yu? From the relationship that the force applied to the superconducting wire 2 on the outer periphery is close to the sum of the forces applied to each winding layer portion of the superconducting wire 2,
In order to withstand this enormous force, there is a problem in that the thickness of the epoxy resin layer 3 covering the outside of the outermost superconducting wire 2 must be made considerably thicker. Increasing the thickness of the epoxy resin layer 3 in this way means that when the entire superconducting magnet is cooled, the thick epoxy resin layer 3 is interposed between the coolant and the superconducting wire 2, making cooling indirect. There is a problem that cooling performance deteriorates.

In the superconducting magnet shown in FIG. 7, if the wire 5 is cut at even one place, the force of the wire 5 to consolidate the superconducting wire is drastically reduced, which may cause the superconducting wire to be destroyed by electromagnetic force. There is a problem that causes this.

In the superconducting magnets shown in FIGS. 8 and 9, since the outermost superconducting wire 7 is tightened with the band 8, the band 8 cannot be made thicker, and therefore cannot withstand a large electromagnetic force. There is.

"Purpose of the Invention" This invention was made in view of the above-mentioned circumstances, and it is possible to reliably hold the superconducting wire so that it does not move even due to the strong electromagnetic force generated when the superconducting wire is energized. Another object of the present invention is to provide a superconducting magnet that does not reduce the cooling performance of superconducting wires.

``Means for Solving the Problems'' This invention provides an annular protection plate that is attached to the outer periphery of the flange plate and covers the outermost periphery of the superconducting wire with a required distance between the outermost periphery and the outermost periphery of the superconducting wire. Installation: This protective plate is composed of two or more protective boards, and a plurality of screw holes are formed in the protective plate in the circumferential direction, nine screw shafts are inserted into the screw holes, and nine screw shafts are inserted into the screw holes. It is constructed by providing a presser plate at the tip that contacts the outermost periphery of the superconducting wire.

"Function" The holding plate is supported by the protection plate and reliably holds down the superconducting wire, and when cooling the entire superconducting magnet, the refrigerant directly cools the superconducting wire.

"Embodiment 1" Figures 1 to 3 show an embodiment of the double pancake coil of the present invention, in which a disc-shaped collar plate 10B and an IOB are provided on both sides of a cylindrical winding drum 10A. After installation, a bobbin 1O is formed, and superconducting wires 11 and 12 are wound around the winding drum 10A in two rows along the central axis direction of the winding drum 10A. The outermost periphery 11a of the superconducting wire 11.12 wound in 10 layers.

12a is located inside the outermost periphery of the flange plate 10B, IOB, and the outermost periphery F+ of the flange plate 10B, IOB has a required spacing between it and the outermost periphery 11, 12& of the superconducting wire 11.12. An annular protection plate 13 is attached to cover most of the peripheral opening between the collar plates 10B and 108, and to cover the outermost peripheral portions 11a and 12a. This protective plate 13
is formed by combining two protective substrates 13A each having a substantially semicircular planar shape with a circumferential portion slightly shorter than the circumferential portion of the semicircular portion, and one side end of the circumferential portion of each protective substrate 13A. The superconducting wires 11 and 12 are brought into contact with each other and are screwed to the collar plates 10B and 10B by forming an entrance 14 between the other ends, and the superconducting wires 11 and 12 wound around the winding drum IQA through this entrance 14 are shown in FIG. It is pulled out as shown. The protective plate 13 has screw holes 13 &
are lined up in pairs in the width direction of the retention board 13, and the retention board 130
Along the circumferential direction 'VC and facing the center in the width direction of the outermost circumference parts 11a and 12a of the superconducting wires 11. When the presser screws 15 are inserted into the button, a curved plate-shaped presser plate 16 is inserted into the insertion hole 16 formed in the center of the convex surface of the presser plate 16, and the presser screws are inserted into the presser screws. Attached by inserting the tip of 15, each presser plate 1
6 pushes the outermost circumferential parts 11a, 121L of the superconducting wire 11.12 toward the winding drum 10A side and finds the superconducting wire 11.12.

The superconducting wires 11 and 12 are compound-based superconducting wires such as Nb and S, and each superconducting wire is made into a composite wire with each element in its own state before forming a compound, and then subjected to diffusion heat treatment. This is a well-known material formed by producing a superconducting gold-scented compound. Furthermore, the protection plate 13 and the presser plate 16 are made of SUS 304. which is a non-magnetic material. SUS
504L, SUS! 104LN, 5US516,
5US316L.

It is made of stainless steel such as 5US316LN.

In the superconducting magnet configured as described above, when a current is passed through the superconducting wire 11.12, the superconducting wire 11.12
When an electromagnetic force acts on the superconducting wires 11 and 12 and the superconducting wires 11 and 12 try to bulge outward in the radial direction of the pobbin 10, the holding plate 16 moves the superconducting wire #i! Hold down 11.12 to prevent this and prevent damage to superelectric 4 wires 11.12. In addition, when cooling the entire superconducting G stone with a refrigerant, the refrigerant is in the term 't4 in the bobbin 10.
Since the R11°12 can be directly cooled, the cooling efficiency is also improved, and the diffusion heat treatment of the superconducting wires 11 and 12 may be performed after the winding of the superconducting wires 11 and 1z around the winding drum 10A. In this case, the superconducting magnet of the Taiei example is subjected to diffusion heat treatment with the holding plate 16 holding the conductor wire 11°12. For example, the diffusion heat treatment is performed at 800°C for 50°C. This is done by holding +=+ for the time.

Then, due to the high temperature of heat treatment, the retaining screw 15 and retaining plate 1
6 deteriorates, causing a decrease in their strength. In this case, it is better to replace the retaining screws 15 and retaining plate 16 with new ones.

In addition, the protection plate 13 is divided into two parts, 1 part and 1 part.
Since there is no requirement to bend this when installing 3,
Each protective plate 13A should be formed sufficiently thick. Therefore, the strength of the protection plate 13A is sufficient, and even if a large electromagnetic force is applied, the superconducting wires 11 and 12 can be reliably supported, and
Even after the above diffusion heat treatment, the strength of the superconducting wire is 11.1.
The value is sufficient to support 2. Of course protection plate 1
It is also possible to exchange 3.

The number of presser plates 16 attached to the protection plate 13 may be selected as appropriate depending on the magnitude of the electromagnetic force generated by the superconducting wires 11.
Similarly, the diameter may be selected as appropriate. In addition, by increasing the number of presser plates 16, the outermost periphery ff of the superconducting wire 11.
It can also be configured to press these over the entire circumference of 1lla and 12a. Zarani, Choden 2: fiit
Wrap stainless steel tape around the outermost peripheral parts 11a and 12a of 1 and 12, and press the outer surface of this stainless steel tape onto the holding plate 16.
It may be configured to be pressed by. With this configuration, the 4 wires 11.
can also be held down.

"Embodiment 2" Figures 4 and 5 show a second embodiment of the present invention.
Components that are the same as those of the first embodiment shown in FIGS. 1 to 3 are given the same reference numerals, and their explanation will be omitted. In this embodiment, a fitting groove 16'b is formed on the concave side of the holding plate 16' in the longitudinal direction of the holding plate 16'.
Then, the curved plate spacer 17 having a protrusion 17a that can be fitted into the fitting protrusion 16'b connects the protrusion 17a to the fitting groove 16'.
a and is integrated into a holding plate 16', and the holding plate 16' is configured to hold down the superconducting wires 11.12 via the spacer 17. This spacer 17 is Fl”LP
, Bakelite, ceramics, mica, glass, Teflon, and other insulating materials.

In this embodiment, the insulation is improved due to the presence of the spacer 17, which provides the same effect as the first embodiment. Moreover, the state shown in FIG.
As shown in the figure, the circumferential surface of the outermost circumferential portion 11& of the superconducting wire 11 is inward from the circumferential surface of the outermost circumferential portion 12a of the superconducting wire 12, and both circumferential surfaces are irregular. in this case,
The superconducting wire 1 is made by applying nitric acid to make the thickness ζ of the holding plate 16' and spacer 17 that hold down the superconducting wire 11 thicker than the thickness of the holding plate 16' and spacer 17 that hold down the superconducting wire 12.
1.12 are securely pressed separately. In addition, it is possible to hold down the uneven superconductor 4 wires 11 and 12 by lengthening the holding screw 15, but the holding screw 1
If the length 5 is too long, there is a risk of buckling of the screw 15, so it is preferable to change the thickness of the presser plate 16' and the spacer 17 to accommodate the above-mentioned irregularity. Furthermore, it goes without saying that this misalignment of the superconducting wires 11 and 12 can be dealt with by changing the thickness of the presser plate 16 even in the structure of @11. Furthermore, in the case of the above-mentioned irregularities, if the step formed by the outermost peripheral surface of the superconducting wire is small, each superconducting wire can be held down individually by adjusting the feeding state of the holding screw 15 by rotating the holding screw 15. Needless to say, it can be done.

Note that the projection 17a of the spacer 17 and the fitting groove 16'b of the holding plate 16' may be omitted, and the spacer 17 may be attached to the holding plate 16.

"Manufacturing example" A forced cooling type superconducting wire (diameter: 23mm, X1311111), which is a composite of Hb and Sn, is used as a winding wire, and a bobbin inner diameter is 200 m1 (winding inner diameter 300*x) and a bobbin outer diameter is 610 mm. A double pancake-shaped coil (winding outer diameter between 550 and 580 mm) was manufactured. Winding T35 on the bobbin
m, wrap 20 turns in total, 10 turns each on the top and bottom,
A 5USso4LV protection plate with a thickness of 15 mm was screwed to the outermost circumference of the bobbin's collar plate, and the winding wire was pulled out from the entrance and exit of the H retaining plate. The screw hole of the holding plate is Mlo, the holding plate is 31 thick,
One with a thickness of 5 WIm, one with a thickness of 10 mm, and one with a thickness of 20 silk were each prepared, and the holding plates of each thickness were used depending on the gap between the protective plate and the circumferential surface of the outermost portion of the winding. The distance between each screw hole along the circumferential direction of the protection plate is 80 mm, and the size of the holding plate is 20 mm.
ymWX 50, and the interval between each presser plate along the circumferential direction of the protection plate was n30 mm. The thus produced double pancake-shaped coil was held at 800° C. for 50 hours and subjected to diffusion heat treatment to generate an N b I Snn intermetallic compound, thereby making the winding a N b S S n superconducting wire. Next, remove the first presser plate, replace it with a new presser plate that has not undergone diffusion heat treatment, and insert the inner KFR of the new presser plate.
P spacer (200t x 20xWX 50 silk L)
) was attached to hold the superelectric 2-sai wire. The double pancake-shaped coil produced in this way is energized with 10 KA to obtain a backup magnetic field of 6 T (Tesla), and the central magnetic field is 1
0T was generated. At this time, the maximum electromagnetic force of the superconducting wire at the outermost periphery was SOOkgt15Cm, but the superconducting wire
- withstood this electromagnetic force for 10 minutes, and was able to operate normally without any abnormalities such as quenching of the superconducting magnet.

``Effects of the Invention'' As explained above, according to the present invention, the holding plate supported by the holding screw on the annular protection plate attached to the collar plate (thereby, Since the outer periphery is held down, the superconducting wire can be held securely.Also, the protection plate is temporarily attached to the collar after the superconducting wire is wound around the winding drum, but the protection plate is made up of two or more protection boards. Since there is no need to bend the protection board when attaching the protection board, the thickness of the protection board can be made sufficiently thick.Therefore, even if a large electromagnetic force acts on the superconducting wire, the holding plate will reliably hold the superconducting wire. In addition, when cooling the entire superconducting magnet, the refrigerant can directly contact the superconducting wire inside the protective plate, which is more effective than the conventional method in which the superconducting wire is covered with epoxy resin. It also has a configuration that increases cooling efficiency.

[Brief explanation of the drawing]

Figure 1iX1 to Figure 3 show the first embodiment of the present invention, where Figure 1 is a cross-sectional view, Figure 2 is a plan view showing how the protective plate is attached, and Figure 3 is a cross-sectional view of the body part. , FIG. 4 and FIG. 5 show a second embodiment of the present invention. FIG. 4 is a cross-sectional view, FIG. 5 is a perspective view showing the holding plate and spacer, and FIG. 7 is a cross-sectional view showing the conventional example, and FIG. 7 is a perspective view showing the second conventional example.
The figures show a third conventional example, with FIG. 8 being a cross-sectional view and FIG. 9 being a perspective view. 10A... Winding drum, IOB... Flange plate, 1
1, 12... superconducting wire, lla, 12a...
...Outermost periphery, 13...Protection plate, 13A...
...Protective board, 13 &... Screw hole, 15.
...Press screw, 16...Press plate, 16'
・・・・・・Press plate. 15th! A Figure 2 Figure 3 Figure 4 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] In a superconducting magnet in which a superconducting wire is wound around a winding drum with collar plates on both sides, the outer periphery of the collar plate has a required distance between it and the outermost periphery of the superconducting wire wound around the winding drum. An annular protection plate made of two or more protection substrates is installed to cover the outermost circumferential surface of the superconducting wire with an opening, and a plurality of screw holes are formed in the protection plate along the circumferential direction, A screw shaft protruding inward of the protection plate is screwed into the screw hole so as to be movable in the radial direction of the winding drum, while a tip of the screw shaft protruding inward of the protection plate is fitted with the superconducting wire. A superconducting magnet that is provided with a presser plate that comes into contact with the outermost periphery of the magnet.