JPS5933240B2 - nuclear fusion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nuclear fusion device, and more particularly to an improvement in the insulation structure of a connecting portion of a poloidal coil wound approximately concentrically on the outside of a vacuum vessel.

A nuclear fusion device uses a magnetic field to confine high-temperature plasma inside a vacuum vessel, away from the vessel wall.

Figures 1 and 2 are tokamak-type nuclear fusion devices,
1 is an annular vacuum vessel; 2 is a toroidal coil that creates a magnetic field to confine plasma inside the vacuum vessel 1; a large number of wound coils are arranged in parallel on the outside of the vacuum vessel 1;

3 is a poloidal coil wound around the outer circumference of the vacuum vessel 1 almost concentrically with the vacuum vessel 1, and the air-core current transformer coil that heats the plasma and the vertical magnetic field coil that maintains the balance and stability of the plasma have improved performance. It is located inside the toroidal coil 2 for this purpose.

Reference numeral 4 designates a torus center column, 5 a frame, 6 a column, 7 a support for the poloidal coil 3, and 8 and 9 support columns for fixing the support 7 to the frame 5 from between the toroidal coils 2.

Since the toroidal coil 2 and the poloidal coil 3 are interlinked, the poloidal coil 3 and the pedestal 5 are generally separated, and the connecting portion 3a of the toroidal coil 3 is provided apart from the toroidal coil 2.

The poloidal coil 3 has at least one connection portion 3a, and the connection work is one of the final work at the installation site.

Therefore, the work of connecting the coil conductors and the work of insulating them are carried out in an extremely small space limited to the already assembled toroidal coil 2 and the vacuum vessel 1, and the connection part 3a
joint strength and connection strength are likely to be unsatisfactory.

Conventionally, connection joints for coil conductors have been developed that are strong enough to be assembled in a narrow space, but in order to compensate for the insulation strength, the support 7a near the connection part 3a is made of FRP or other insulation material with high mechanical strength. By constructing the support member 7 with a material, the creepage distance from the unsatisfactory insulation construction part to the support 7 made of stainless steel or the like is increased and creepage discharge is prevented.

If the support body γa near the connection part 3a is constructed of an insulating material in this way, the strength will be low, resulting in a decrease in reliability, and if the humidity in the air increases, the creepage distance will be insufficient and there is a risk of electrical discharge. It also had drawbacks such as insufficient reliability in terms of insulation strength.

The present invention has been made in view of the above-mentioned drawbacks, and provides a nuclear fusion device in which the mechanical strength of the support near the connection part of the poloidal coil is increased, and an insulating structure with no creeping discharge at the connection part and high insulation strength is provided. The purpose is to

EMBODIMENT OF THE INVENTION Below, one embodiment of the present invention shown in the drawings will be described.

In FIGS. 3 and 4, parts having the same functions as those in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.

After the connecting portion 3a of the coil conductor of the poloidal coil 3 has been connected and insulated, the space around it is completely filled with a synthetic resin 10 such as epoxy resin.

Since the supports 7a are arranged radially from the center of the fusion device, the center side between the supports 7a is closed with a boundary plate 11, and the outside is closed with a boundary plate 12 to form a casting chamber. The interior of the chamber is appropriately divided by a partition plate 13, and a liquid injection port 14 and a liquid drain port 15 are provided according to the number of partitions, and a molded synthetic resin such as epoxy resin is filled into the molding chamber from the liquid injection port 14. It is cured at room temperature.

Next, the action will be explained.

To assemble the fusion device, after installing the toroidal coil 2, connect the poloidal coil 3 to the toroidal coil 2 and the vacuum vessel 1.
The connection part 3 is inserted into the gap between the
The connection work and insulation work of a is performed.

Therefore, the mechanical strength and insulation strength of the connection part 3a are unsatisfactory, but after the insulation work, a synthetic resin 10 such as epoxy resin is injected between the supports 7a around the connection part 3a and hardened, so that it is fixed to the support 7a. The mechanical strength and dielectric strength can be increased by combining the two into one body.

In addition, to inject the synthetic resin 10, the liquid synthetic resin is injected into the casting chamber surrounded by the boundary plates 11 and 12 from the injection port 14, and since there is a drain port 15, the liquid synthetic resin is filled to every corner of the casting chamber. Since it is cured at room temperature, it can be easily installed during on-site installation.

In the above, 15 may be replaced with a liquid injection port, and 14 may be replaced with a liquid drain port.

FIG. 5 shows another embodiment in which a boundary plate 1 is placed on the side of the support 7a.
6 to form a casting chamber.

As described above, according to the present invention, in a nuclear fusion device, a casting chamber is formed by closing the connecting portion of a poloidal coil with boundary plates provided on the inner and outer circumferential sides thereof, and a synthetic resin is placed inside the casting chamber. Since the connection part of the poloidal coil is cast-cured and fixed to the support body, it can be easily done even in the final stage of installation and assembly. However, since the connecting portion is integrated with the support via the synthetic resin, the mechanical strength and dielectric strength of both the connecting portion and the support can be increased, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing a conventional nuclear fusion device, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a main part of one embodiment of the nuclear fusion device of the present invention. 4 is a cross-sectional view showing the 3rd
FIG. 5 is a longitudinal cross-sectional view taken along the line B--B in the figure, and FIG. 5 is a cross-sectional view showing the main parts of another embodiment. 1... Vacuum vessel, 2... Toroidal coil, 3... Poloidal coil, 3a...
... Connection part, 7 ... Support body, 1a ...
Support, 10...Synthetic resin, 11.12...
... Boundary plate, 13... Branch board, 14...
...Liquid inlet, 15...Drainage port, 16...
・Boundary plate.

Claims (1)

[Claims] 1. An annular vacuum container, a poloidal coil wound approximately concentrically around the outside of the vacuum container and having at least one connection, and a support that fixes the poloidal coil to a pedestal and is arranged radially from the center of the vacuum container. A casting chamber is formed by closing the connecting portion of the poloidal coil with boundary plates provided on the inner and outer circumferential sides of the poloidal coil, and a synthetic resin is cast and cured inside the casting chamber. A nuclear fusion device characterized in that a connecting portion of a poloidal coil is integrally fixed to a support.