JPS6142402B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting electromagnet used in superconducting electromagnetic levitation vehicles and the like.

In recent years, research and development regarding superconducting magnetic levitation vehicles has shown remarkable progress, and the superconducting electromagnets used therein have continued to be improved in order to meet the strict requirements of greater strength, larger capacity, lighter weight, and smaller size. However, as superconducting electromagnets become more powerful and have a larger capacity, the ampere-turns of superconducting electromagnets are increasing rapidly, and the electromagnetic force is becoming more powerful than we can imagine. For this, for example
When using an 800 KAT racetrack-shaped (elliptic) superconducting coil, an electromagnetic repulsive force of 26 tons/m acts between the opposing long sides of the coil, and the question is how to absorb this repulsive force. Stably fixing the coil has become a major technical issue in the production of superconducting electromagnets. If this coil is not stably fixed, the superconducting electromagnet will no longer be able to maintain its superconducting state, leading to the quench phenomenon.

Here, an example of a superconducting electromagnet currently planned will be described with reference to Figs. 1 and 2. In the figure, 1 is an inner tank with a slightly flat cross section constructed in the shape of a racetrack, which is not shown. It is insulated and stored inside the outer tank using a load support material with low heat transfer, vacuum and special heat insulating material. Further, the upper and lower opposing long sides are connected to each other by a bonding material 2 to prevent deformation. Reference numeral 3 denotes a superconducting coil housed inside the inner tank 1 in an elliptical shape, and this is usually formed into a rigid structure by integrally molding and solidifying and fixing it by means such as molding. , such superconducting coils 3 are provided with appropriate intervals in the longitudinal direction.
An insulating plate 4 made of FRP or the like is fitted and a spacer 5 is placed around the outer periphery of the insulating plate 4, and the coil 3 is fixedly held within the inner tank 1 by the spacer 5. In addition, since the superconducting coil 3 cannot be stored in the inner tank 1 and the spacer 5 unless they are divided, they are constructed by dividing each into two vertically or horizontally, and are assembled by covering the superconducting coil 3 and joining them by welding or the like. I'm thinking about it. Further, although not shown in the drawings, it is a matter of course that various equipment, piping, etc. necessary for configuring the superconducting electromagnet are incorporated. As described above, the inner tank 1 is insulated and supported inside the outer tank to suppress the amount of heat intrusion to an extremely low level, and the inner tank 1 is filled with liquid helium to keep the superconducting coil 3 at an extremely low temperature. The superconductor is then cooled to maintain a superconducting state, and a persistent current is obtained by excitation. In addition, during the excitation, liquid helium flows into the inner tank 1.
Holes 6 are formed in the spacer 5 so that the helium gas can flow to fill the entire area inside the spacer, and so that helium gas vaporized by heat penetration can rise.

In the case of a superconducting electromagnet having the above structure, if the spacer 5 does not sufficiently hold the superconducting coil 3 fixedly, the coil 3 may become loose or deformed or moved due to electromagnetic repulsion due to excitation or some kind of vibration. This causes the problem that the superconducting state collapses and progresses to a quench phenomenon. For this reason, stably fixing the coil is a major technical challenge when manufacturing superconducting electromagnets.

The present invention has been made in view of the above circumstances, and its purpose is to fix a superconducting coil extremely reliably and stably inside the inner tank, completely prevent deformation and movement of the coil, and achieve a very stable high-speed The object of the present invention is to provide a superconducting electromagnet that has excitation ability and is optimal for superconducting magnetic levitation vehicles and the like.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Note that only the main parts are shown here, and the rest are the same as those in FIGS. 1 and 2, so illustrations are omitted for the sake of simplification.

Here, Figure 3 shows the cross section of the spacer and the superconducting coil in the same way as Figure 2, and Figure 4 shows an example of the use of a tool that applies precompression force when assembling the spacer. The coil is solidified and fixed by integral molding etc. in the same way as described above to form a racetrack shape, and around the cross-sectional part with intervals in the longitudinal direction of this superconducting coil 3A.
Insulating plates 4A, 4B, 4C, and 4D such as FRP are arranged, and spacers 5A and 5B of upper and lower halves with holes 6A are surrounded on the outer periphery, and metal spacers 5A and 5B are directly attached to the superconducting coil 3A. The insulating plates 4A to 4D prevent the superconducting wires from being damaged or short-circuited by contact with each other, and the insulating plates 4A to 4D have sufficient clearance to prevent leakage from poor insulation due to the potential generated during excitation. I'm trying to earn pages.

Here, the spacers 5A and 5B of the above-mentioned two-part structure
The superconducting coil 3A is connected to the insulating plates 4A to 4 from above and below.
Weld beads 8A and 8B are sandwiched through D.
The upper and lower dividing spacers 5
In addition to the hole 6A for passage of cooling liquid helium or vaporized helium gas, A.5B has arcuate escape grooves at the four corners of the cross section of the superconducting coil 3A, that is, at the inner corners of the upper and lower sides. 7A, 7B and 7C.
7D, and have a structure that can be appropriately elastically deformed at the clearance groove, and are welded together with a pre-compression force applied from the outer periphery by a tightening tool 9 as shown in FIG. ing. This tightening tool 9 has a configuration in which arch-shaped upper and lower members 9A and 9B are connected by bolts 9C and 9D, respectively, and when the bolts 9C and 9D are tightened, the upper and lower members 9A and 9B are
is pressed against the outer peripheral corners of the divided spaces 5A and 5B. Although not shown, an inner tank with a two-part structure is placed over the outside of the combined spacers 5A and 5B and welded together, and the inner tank is further heat-insulated and housed inside the outer tank to assemble a superconducting electromagnet. It consists of

In the superconducting electromagnet configured as described above, insulating plates 3A, 3B, 3C, and 3D are arranged around the superconducting coil 3A having a flat cross section to prevent short circuits due to damage to the coil surface and to reduce the potential generated during excitation. Provide sufficient creepage to prevent leakage from poor insulation.
3B, 3C, and 3D are surrounded by spacers 5A and 5B divided into upper and lower halves and welded together, and these divided spacers 5A and 5B are connected to the insulating plates 4A and 3D, respectively.
The parts facing and contacting 4B, 4C, and 4D are hard and strong, but there are relief grooves 7A, 7B, and 7 at the inner corners.
By having C.7D, it can be elastically deformed and has a spring action, and such a divided spacer 5A.
5B is strongly pressed with the tightening tool 9 to elastically deform it, and the parts facing the insulating plates 4A, 4B and 4C, 4D are pre-deformed so that the acting force is greater than or equal to the electromagnetic force generated in the superconducting coil 3A. By applying compressive force and joining the weld beads 8A and 8B, the spacers 5A and 5B are able to connect the insulating plates 4A and 4 even with an elastic force greater than the electromagnetic force.
It becomes possible to tighten and hold the superconducting coil 3A fixed via B, 4C, and 4D. At this time, the relief grooves 7A, 7B, 7C, and 7D are connected to the insulating plates 4A and 4.
It also has the ability to absorb irregularities in B, 4C, and 4D. After applying a precompression force to the spacers 5A and 5B and making them into a connected state, the spacers 5A and 5B are
By tightening and welding the inner tank divided into two to cover the outside of the superconducting coil 5B, the spacer and the inner tank are firmly fixed, and even if a large electromagnetic force acts on the superconducting coil 3A, the superconducting coil 3A Spacer 5
A and 5B are firmly fixed and tightened, and the spacers 5A and 5B are also firmly fixed by the inner tank, so they cannot be displaced, and the superconducting coil 3A may be inadvertently deformed when excited. This completely prevents the magnet from moving and causing quenching, making it possible to maintain an extremely high excitation ability.

In addition, as another embodiment of the present invention, the two-split spacers 5A and 5B are connected to each other by welding beets 8A and 5B.
Although not shown, instead of using the spacers 8B, the spacers 5A and 5B may have an overlapping structure, and a tightening force may be applied to the spacers, and then the dowel pins are fixed by passing the joint reamer through, and the same effect can be obtained. becomes.

Since the present invention is made as described in detail above, the superconducting coil can be very reliably and stably fixed inside the inner tank with the spacer, and the deformation and movement of the coil that would impede the superconducting state can be completely prevented.
It has extremely stable and high excitation ability, making it ideal for superconducting magnetic levitation vehicles and the like.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing the main structure of a racetrack-shaped inner tank of a superconducting electromagnet currently planned, Fig. 2 is an enlarged sectional view taken along the line - in Fig. 1, and Fig. 3 is an inventive concept of the present invention. FIG. 4 is an explanatory diagram showing the relationship between a spacer and a cross section of a superconducting coil, showing one embodiment of the present invention. FIG. 1... Inner tank, 2... Binding material, 3, 3A... Superconducting coil, 4, 4A, 4B, 4C, 4D... Insulating material, 5, 5A, 5B... Spacer, 6, 6A...
Hole, 7A, 7B, 7C, 7D... Relief groove, 8A,
8B...Welding bead, 9...Tightening tool, 9A,
9B...Upper and lower members, 9C, 9D...Bolts.

Claims (1)

[Claims] 1. In superconducting electromagnets used in superconducting magnetic levitation vehicles, etc., an insulating plate is arranged around a superconducting coil solidified and fixed by molding, etc., and each insulating plate has relief grooves at the inner corners on the outer periphery of the insulating plate. A spacer having a two-part structure that can be elastically deformed is enclosed, and both spacers are given a pre-compression force and connected to each other by welding or pins to prevent deformation and movement of the superconducting coil. A superconducting electromagnet characterized by: