JPS623966B2 - - Google Patents

Description

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

In recent years, research and development regarding superconducting magnetically levitated vehicles has shown remarkable progress, and the superconducting electromagnets used therein have continued to be improved to meet strict demands for 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 imagined. 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. 3 is 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 fixing it by means such as molding. The superconducting coil 3 is provided with an appropriate interval in the longitudinal direction of the FRP.
An insulating plate 4 such as the above 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 them 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 devices, piping, etc. necessary for configuring the superconducting electromagnet are incorporated. As described above, the inner tank 1 is thermally supported inside the outer tank to suppress the amount of heat intrusion to an extremely low level, and by filling the inner tank 1 with liquid helium, the superconducting coil 3 is heated to an extremely low temperature. The superconducting state is maintained by cooling to
Persistent current is obtained by excitation. Note that holes 6 are formed in the spacer 5 so that liquid helium can flow to fill the entire area inside the inner tank 1 during excitation, and so that helium gas vaporized by heat penetration can rise. put.

In the case of a superconducting magnet having the above structure, if the superconducting coil 3 is not sufficiently fixed and held by the spacer 5, the coil 3 may become loose, or may be 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.

Similarly to FIG. 2, FIG. 3 shows the relationship between the spacer and the cross section of the superconducting coil, and FIG. 4 is a side view of FIG. 3, also showing the relationship with the inner tank. here 3
The superconducting coil indicated by A is solidified and fixed by integral molding or the like as described above to form a race track shape, and an insulating plate 4 such as FRP is placed around the cross-sectional portion having intervals in the longitudinal direction of the superconducting coil 3A.
A, 4B, 4C, 4D are arranged, and a hole 6A is placed on the outer periphery.
The superconducting coil 3A is surrounded by spacers 5A and 5B that are divided into upper and lower parts.
The insulating plates 4A to 4D prevent the superconducting wires from directly hitting the superconducting wires and causing them to shoot, and the insulation plates 4A to 4D have sufficient insulation to prevent short circuits when excitation or quenching occurs. I'm trying to earn pages.

Here, the spacer 5A having the above-mentioned upper and lower two-divided structure,
5B has a T-shaped joint flange 7AA at the joint part,
7AB, 7BA, 7BB are provided, bolt 8A,
8B, and are strongly tightened and connected to each other.
These flanges 7AA to 7BB have a root portion with a large radius indicated by 9 relative to the spacer body to prevent stress concentration, and at the same time are provided with a notch 10 with a large radius to provide strong rigidity. It has an elastically deformable structure. Also, T-shaped flanges 7AA, 7AB, 7BA, 7BB like this
As shown in FIG. 4, the insulating plates 4C and 4D on both sides are made wide enough to sufficiently cover the flange and ensure sufficient creepage for the superconducting electromagnet. Then, the inner tank 1A is divided into two parts and is covered and welded to the outer periphery of both the spacers 5A and 5B in the combined state, and furthermore, the inner tank 1A is insulated and supported inside the outer tank to be stored and held, although it is not shown. It constitutes a superconducting electromagnet.

Next, to explain the function of the present invention, the main body structure portions of the spacers 5A, 5B that are in contact with the upper and lower insulating plates 4A, 4B have holes 6A for passage of liquid helium or gas helium, but are generally strongly constructed. Because of this, there is almost no deformation, and it can be fixed in close contact with the upper and lower insulating plates 4A and 4B. On the other hand, T-shaped joint flanges 7AA, 7AB, 7
BA, 7BB have strong rigidity due to the large radius root 9 and notch 10, but are elastically deformable and have a spring action.
is slightly elastically deformed to withstand the tightening force of the bolts 8A and 8B. Here, the joining flange 7
If the tightening strength of AA, 7AB, 7BA, and 7BB is set to be equivalent to or even higher than the electromagnetic force acting on the superconducting coil 3A, even if a large electromagnetic force acts on the superconducting coil 3A, the spacers 5A, 5B and the insulating plate will remain intact. 4A,
4B is now prevented from forming, and since the outer sides of the spacers 5A and 5B are closely fixed by the inner tank, the superconducting coil 3A will not move slightly or deform when it is excited. This movement is completely prevented, and there is no possibility of an unstable phenomenon in which the superconducting state is broken and quenched due to slight movement of the superconducting coil 3A.

In addition, when tightening the spacers 5A and 5B with an appropriate force, the bolts 8A and 8B themselves have the ability to apply a preload tightening force, so that the spacers 5A and 5B can be tightened with an appropriate force.
No special tools are required to tighten A and 5B.

Especially T-shaped joint flanges 7AA, 7AB, 7
Both BA and 7BB have elasticity of appropriate strength, so as bolts 8A and 8B are tightened, they will deform to a certain extent, and this deformation will cause bolts 8A and 8B to deform to a certain extent. There is no problem even if the tightening force has a considerable range, and for this purpose bolts 8A, 8
If the tightening torque of B is properly controlled, it is possible to apply the appropriate tightening force, and if the tightening torque is properly controlled, the spacer will be installed correctly.
It becomes possible to provide a stable superconducting electromagnet.

Since the present invention is made as detailed above, the superconducting coil can be fixed very reliably and stably 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 invention of the present invention. FIG. 4 is a diagram illustrating the relationship between a spacer and a cross section of a superconducting coil showing one embodiment, and FIG. 4 is a partially sectional side view of an inner tank in the same embodiment. 1,1A...Inner tank, 2...Binding material, 3,3A...
...Superconducting coil, 4, 4A, 4B, 4C, 4D...
...Insulating material, 5,5A,5B...Spacer, 6,6
A...hole, 7AA, 7AB, 7BA, 7BB...joining flange, 8A, 8B...bolt, 9...large diameter root, 10...notch.

Claims (1)

[Claims] 1. In a superconducting electromagnet used in a superconducting magnetic levitation vehicle, etc., an insulating plate is arranged around a superconducting coil fixed by a mold etc., and a spacer with a two-part structure is placed around the outer periphery of the insulating plate, and the two parts are separated. T-shaped joining flanges that have strong rigidity but can be elastically deformed are provided at the joints of the spacers, and by tightening the joining flanges together with bolts, a force equivalent to or greater than the electromagnetic force acting on the superconducting coil can be applied. A superconducting electromagnet characterized in that the coil is firmly held by combining both split spacers with a biasing force.