JPH0834148B2 - Superconducting magnet - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a superconducting magnet, and particularly in a magnet integrally solidified with an epoxy resin or the like, preventing the superconducting coil from being quenched by peeling from the winding drum portion, As a result, the present invention relates to a superconducting magnet in which the number of trainings is significantly reduced.

[Technical background of the invention] Conventionally, a high magnetic field magnet manufactured by using a compound superconducting wire by a wind & react method has been known, and in such a magnet, the superconducting characteristics are deteriorated due to an excessive hoop stress generated by an electromagnetic force. To prevent this, high-strength stainless wire or aluminum wire with high heat shrinkage is wound with high tension on the outermost layer of the coil part, or a cylinder made of stainless steel or aluminum is fitted and the coil is epoxy-coated. Impregnation with a resin or the like is performed.

[Problems of the Background Art] In the magnet as described above, an insulator made of glass fiber or the like is interposed between the superconducting coil and the winding drum, the collar plate, and the reinforcing wire. It is impregnated with epoxy resin or the like. Therefore, the stress generated in the radial direction by the electromagnetic force when the magnet is energized is supported by the elastic force determined by the Young's modulus of the reinforcing wire, the matrix portion of the superconducting wire and the epoxy resin.

However, in the magnet having the above structure, the epoxy resin or the like is not sufficiently impregnated between the winding drum and the insulator on the winding drum, and when the magnet is excited in a high magnetic field, It may peel off and cause a quench, and the number of trainings due to this is much higher than that of Nb-Ti alloy coil which is not integrated with epoxy resin etc., and therefore the use of liquid He during the test There is a drawback that the amount increases and it becomes economically disadvantageous.

[Object of the Invention] The present invention has been made in order to solve the above-mentioned problems, and provides a superconducting magnet having a structure capable of remarkably reducing the number of trainings based on Quentch caused by the separation between the superconducting coil and the bobbin. The purpose is to do.

[Summary of the Invention] The present invention relates to a winding frame provided with a pair of collar plates at both ends of a winding cylinder,
A superconducting coil comprising a superconducting coil wound around this winding frame, wherein the coil is solidified with a synthetic resin, wherein the coil comprises a compound superconducting coil formed by a wind-and-react method, By joining together with the collar plate and not joining with the winding drum, the above-mentioned difficulties due to separation of the superconducting coil from the winding frame are eliminated, and the characteristics of the magnet are improved.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the superconducting magnet of the present invention taken along a plane including the coil axis, and FIG. 2 is a sectional view taken along the line AA ′ of the winding cylinder taken along a plane perpendicular to the winding cylinder.

In FIG. 1, a superconducting magnet 1 is wound around a winding cylinder 2 made of stainless steel, collar plates 3a, 3b made of stainless steel arranged near both ends of the drum, and a space formed by the winding cylinder and the collar plate. It is provided with a superconducting coil 4 made of a compound-based superconducting wire and a reinforcing layer 5 provided on the coil. The superconducting coil 4 is integrally impregnated with epoxy resin and solidified with the epoxy plates 3a and 3b to be joined. However, the carp 4 and the outer periphery of the body portion 2a of the winding drum 2 are simply contacted with each other or are not joined in a non-contact state.

The superconducting coil 4 is composed of, for example, a Nb ₃ Sn superconducting wire having a multi-core structure, and in this case, a composite wire containing an Nb filament and Sn or Sn alloy in a Cu matrix is wound around a winding frame through an insulating material. After that, it is formed by performing a heat treatment for diffusing Sn into the Cu matrix and a heat treatment for generating Nb ₃ Sn.

The winding cylinder 2 is composed of a cylindrical body portion 2a and flange portions 2b, 2c formed on both end sides thereof.
2c is fixed to the collar plates 3a and 3b by bolts 6, respectively.

As shown in FIG. 3 and FIG. 3 showing the plane of the flange portion 2b viewed from the direction B in FIGS. 2 and 1, the winding drum 2 has a structure that is divided into eight parts and can be disassembled and assembled. The flange portions 2b and 2c are also divided into eight parts accordingly.

When the magnet 1 having the above structure is manufactured by the wind-and-react method, after the winding frame is assembled, a superconducting wire is formed by heat treatment in the space formed by the winding cylinder and the collar plate. The wire is wound and subjected to heat treatment for forming a superconducting compound. Next, while maintaining the coil shape, a part of the winding drum, that is, the adjacent members a and b in FIG.
In the order of b, i.e., by moving b in parallel to the center of the winding drum and removing it, then moving b in parallel in the circumferential direction of the winding drum and in the center, and removing the silicone resin-based release material. After applying to the surface of the winding drum, fix it again on the collar plate in the order of → →. After this is performed for all the members, the magnet is housed in a closed container, the inside is evacuated, and the epoxy resin is impregnated.

In the above description, the surface of the winding drum member before being impregnated with the epoxy resin was disassembled → the surface was coated with a mold release material, but instead, a member having Teflon coated on the surface was prepared in advance, You may exchange for this.

After the epoxy resin is impregnated, the outer periphery is machined to smooth the surface and form a reinforcing layer. It is effective to confirm that the winding cylinder and the coil are not joined after the impregnation with the epoxy resin.

[Advantages of the Invention] As described above, in the superconducting magnet according to the wind-and-react method of the present invention, since the compound superconducting coil is not joined to the surface of the winding drum, it is possible to prevent the quenching in the winding drum portion. Since the curable resin is not peeled off, the number of trainings can be remarkably reduced and it is economically advantageous.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the superconducting magnet of the present invention, FIG. 2 is a sectional view taken along the line AA 'in FIG. 1, and FIG. 3 is a flange portion viewed from the direction B in FIG. It is a top view. 1 ... Superconducting magnet 2 ... Winding drum 3a, 3b ... Collar plate 4 ... Superconducting coil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Uchiyama 2-1-1, Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Showa Electric Wire & Cable Co., Ltd. (72) Yuichiro Oda, Sakae Oda, Kawasaki-ku, Kawasaki, Kanagawa 1-1-1 Showa Densen Denki Co., Ltd. (72) Inventor Kiyoshi, Miyake 2-1-1 1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Kanagawa Prefecture (56) Reference: Japanese Patent Laid-Open No. 59-218706 (JP, A) JP-A-58-50712 (JP, A) JP-A-58-6106 (JP, A)

Claims (2)

[Claims] 1. A winding frame provided with a pair of collar plates on both ends of a winding cylinder,
A superconducting coil having a superconducting coil wound on this winding frame, in a superconducting magnet obtained by solidifying the coil with a synthetic resin, wherein the coil is made of a compound superconducting coil formed by a wind-and-react method, A superconducting magnet, which is integrally joined to a collar plate and is not joined to the winding drum. 2. The superconducting magnet according to claim 1, wherein the winding drum can be disassembled and assembled.