JPS6156849B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to superconducting magnet devices.

A superconducting magnet device consists of a coil made by winding a superconducting conductor made of superconducting wire and a stabilizing material such as copper or aluminum, which is stored in a liquid helium container and immersed in liquid helium to maintain it at an extremely low temperature below the critical temperature. be done. The coil becomes superconducting and the electrical resistance of the superconducting wire becomes zero, so a large current can flow and a strong magnetic field can be obtained.
Therefore, a large electromagnetic force acts on the coil, and a hoop force, which is a force that spreads in the radial direction, is generated. However, as the size of the coil increases and the electromagnetic force increases, reinforcing bands made of a material with high mechanical strength, such as stainless steel, are wound in parallel with the superconducting conductor to support the hoop force. However, as the superconducting magnet device becomes larger, the reinforcing band must be thicker, but such a structure cannot be easily bent.
The drawback was that winding the coil was difficult and reliability was reduced. Therefore, in large superconducting magnet devices, the hoop force acting on the coil is directly transmitted to the liquid helium container, so it is extremely difficult to make the outer circumference of the pancake-shaped coil that makes up the coil all the same size. Later, the outer periphery is machined or molded, but the former has disadvantages such as damage to the superconducting wire and dielectric breakdown due to chips, while the latter makes it difficult to mold only the outer periphery of the coil.

The present invention has been made in view of the above-mentioned drawbacks, and provides a superconducting magnet device that can withstand large electromagnetic force by pressing a main spacing material made of semi-hardened thermosetting synthetic resin around the outer periphery of the coil and hardening it by heating. The purpose is to

EMBODIMENT OF THE INVENTION Below, one embodiment of the present invention shown in the drawings will be described. In FIGS. 1 and 2, 1 is a pancake-shaped coil in which a superconducting conductor or a superconducting conductor and a reinforcing plate having a thickness that can be easily bent is wound in parallel; 2a is a lid that closes the container 2; 3 is liquid helium for immersing the coil 1 in the container 2; 4 is a radiation shield cooled with liquid nitrogen or helium gas; 5 is the container 2 and the radiation shield. 6 is a support device for the container 2; 7 is a main spacing member made of thermosetting synthetic resin that is placed in a semi-hardened state in parallel to the outer circumference of the coil 1; 8 is a main spacing member for the container 2; An auxiliary spacing material made of metal or an insulator is inserted between the main spacing material 7 and the main spacing material 7, and the main spacing material 7 is heated and hardened after assembly.

Next, the effect will be explained. The main spacing member 7 is attached to the outer periphery of the coil 1 and stored in the container 2, and the auxiliary spacing member 8
is inserted between the container 1 and the main spacing member 7 while being pressed. Then, since the main spacing material 7 is in a semi-hardened state, it has sufficient elasticity at room temperature, and deforms by adapting to the irregularities between the pancake-shaped coils on the outer periphery of the coil 1. Next, the lid 2a is closed on the container 2, and the main spacing material 7 is heated and hardened. The strong hoop force acting on the coil 1 is transmitted to the container 2 via the main spacing 7 and the auxiliary spacing 8 because the main spacing 7 is in contact with all the pancake-shaped coils.

FIG. 3 shows another embodiment, and the difference from FIG. 2 is that wedge-shaped auxiliary spacing members 9 that are inclined in opposite directions are inserted into the auxiliary spacing members 8, and the circumference of the surface facing the container 2 is A groove 9a is provided in the direction. The auxiliary spacing member 9 can be inserted smoothly during assembly, and can press the main spacing member 7 strongly to sufficiently conform to the irregularities between the pancake-shaped coils. Further, the groove 9a allows helium bubbles generated when the coil 1 generates heat to easily escape upward.

As described above, according to the present invention, in a superconducting magnet device, the main spacer made of a semi-hardened thermosetting synthetic resin is pressed between the outer periphery of the coil and the container by the auxiliary spacer and hardened by heating. The strong hoop force acting on the magnet can be reliably and evenly transmitted to the container, which has the excellent effect of increasing the strength of the large superconducting magnet device.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the superconducting magnet device of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a cross-sectional view showing another embodiment. It is a diagram. 1...Coil, 2...Container, 3...Liquid helium, 7...Main spacing material, 8, 9...Auxiliary spacing material.

Claims (1)

[Claims] 1 Consisting of a coil around which a superconducting conductor is wound, a container in which the coil is stored, and liquid helium in which the coil is immersed in the container, a main interval of semi-hardened thermosetting synthetic resin is provided around the outer periphery of the coil. 1. A superconducting magnet device, characterized in that the main spacing material is pressed by an auxiliary spacing material inserted between the container and the main spacing material is heated and hardened.