JPH0154675B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic limiter cooling device for a nuclear fusion device.

First, an overview of the torus-type fusion device will be described with reference to FIGS. 1 and 2.

In these figures, 1 is an annular vacuum vessel;
Plasma 2 is generated inside it. Reference numeral 3 denotes a poloidal coil outside the container, which serves as a primary winding for generating an annular discharge current in the plasma 2. Reference numeral 4 denotes a poloidal coil inside the container, which serves to create a separator magnetic surface 5 and remove impurities flowing into the plasma 2, as shown in FIG. Since a part of the plasma 2 wraps around the separator magnetic surface 5, its end is connected to the magnetic limiter cooling duct 6.
It is necessary to cool it down. Therefore, the cooling duct 6 is cooled by the refrigerant supplied and discharged from the magnetic limiter cooling pipe 7.

The vacuum container 1 is composed of a thick wall portion 1A and a thin bellows portion 1B, and the inside thereof is evacuated to a vacuum by a vacuum exhaust device 8. Further, a toroidal coil 9 is arranged around the outer periphery of the vacuum container 1, and these are supported by respective bases 10 arranged above and below. 11 is a current transformer.

FIG. 4 is a sectional view taken along line BB in FIG. 2, showing a horizontal section of the magnetic limiter cooling duct 6. As can be seen from this figure, the magnetic limiter cooling ducts 6 are arranged in the toroidal direction of the vacuum vessel 1 at predetermined pitches all around the circumference.

FIG. 5 shows a horizontal cross section of a conventional magnetic limiter cooling device. The cooling pipe 7 in FIG. 3 is composed of a supply pipe 12 and a discharge pipe 13, one end of which is connected to the cooling duct 6 by welding or the like. 6 is designed to be cooled.

By the way, this supply pipe 12 and discharge pipe 1
3 are arranged with pitches in the toroidal direction as shown in the figure, and these pipes 12, 1
Since the cooling duct 3 and the cooling duct 6 are made of metal, an electric circuit is formed that passes through points A to D shown in the figure, and this electric circuit includes the poloidal coil 3 and the cooling duct 6.
This will surround the vertical magnetic flux generated by the Therefore, when plasma is generated, an electromotive force is generated in this electric circuit, and a current flows through the supply pipe 12 and the discharge pipe 13. Due to the interaction between this current and the magnetic field generated by the poloidal coil 3, the supply pipe 12 and the discharge pipe 13 There was a risk that a large electromagnetic force would be generated and destroy the magnetic limiter cooling device.

In order to prevent this, in the electric circuit passing through points A to D mentioned above, the distance between points B and C and between points A and D must be made as small as possible, or in extreme cases, the distance between the supply pipe 12 and the discharge pipe Although it is necessary to dispose the supply pipe 12 and the discharge pipe 13 in a state in which they are in contact with each other, it is necessary to provide a distance of a certain distance or more between the supply pipe 12 and the discharge pipe 13 for the reasons described below.

That is, when removing or reattaching the cooling duct 6 during maintenance, it is necessary to disconnect the supply pipe 12 and the discharge pipe 13 from the vacuum vessel 1 and reconnect it. Since there is no work space for these
These operations must necessarily be performed inside the vacuum container 1. However, it is difficult to secure space inside the vacuum vessel 1 for humans to perform these operations manually, so automatic cutting equipment and automatic welding equipment (hereinafter referred to as robots) have no choice but to perform these operations. However, as shown in FIG. 6, in order for the robot 14 to perform these operations, the robot 14 must be placed around the pipe to be cut or welded (in the illustrated case, the supply pipe 12).
It is necessary to rotate the robot 14, and the adjacent pipe (in the illustrated case, the discharge pipe 13) needs to be separated by a distance so that it does not come into contact with the robot 14. Therefore, the supply pipe 12 and the discharge pipe 13 were forced to be disposed a certain distance apart from each other, and the risk of destruction of the magnetic limiter cooling device due to the electromagnetic force described above could not be prevented.

It is an object of the present invention to provide a highly reliable nuclear fusion system that eliminates the drawbacks of the prior art described above, has good workability in dividing or reconnecting supply pipes and discharge pipes, and is less likely to be destroyed by the aforementioned electromagnetic force. An object of the present invention is to provide a magnetic limiter cooling device for a device.

In order to achieve this object, the present invention has a double pipe structure in which at least the cooling duct side portions of the supply pipe and the discharge pipe are made into an inner pipe and the other is an outer pipe. It is characterized by being divided in the longitudinal direction and detachably connected at the divided portions.

Hereinafter, the present invention will be described with reference to illustrated embodiments.

FIG. 7 shows a horizontal cross section of a magnetic limiter cooling device according to an embodiment of the present invention. In this embodiment, the supply pipe 12 is an inner pipe, the discharge pipe 13 is an outer pipe, and these pipes 12 and 13 are arranged coaxially to form a double pipe structure. Therefore, when cutting or welding these pipes 12 and 13, the robot 14 must be rotated around this double pipe structure, but in this case, unlike conventional Since there are no adjacent pipes, sufficient work space can be secured. In addition, these pipes 12,1
3 are arranged coaxially with each other, the above-mentioned electric circuit is not formed, and almost no magnetic force acts on the magnetic limiter cooling device. Furthermore, the supply pipe 12 forming the inner pipe of the double pipe structure is pre-divided at its dividing portion 12A, and an appropriate sealing structure such as fitting and joining is formed, so that the pipe can be cut or welded. It is only necessary to perform this on the discharge pipe 13 forming the outer pipe of the double pipe structure, and the supply pipe 12 forming the inner pipe can be divided and reconnected without any processing. Therefore, these operations are extremely simple, and the number of man-hours can be significantly reduced.

In the above embodiment, the inner pipe of the double pipe structure is used as the supply pipe 12 and the outer pipe as the discharge pipe 13. However, conversely, the inner pipe is used as the discharge pipe 13 and the outer pipe is used as the supply pipe 12.
Even in this case, the same effects as in the above embodiment can be obtained.

As explained above, according to the present invention, it is possible to easily separate and reconnect the supply pipe and the discharge pipe using a robot or the like, and since no electromagnetic force acts on these pipes, It is possible to prevent the risk of destruction of the magnetic limiter cooling device due to electromagnetic force and improve its reliability.

[Brief explanation of drawings]

Figure 1 is a partially cutaway plan view showing the schematic configuration of a torus-type fusion device, Figure 2 is a sectional view taken along line AA in Figure 1, Figure 3 is a longitudinal sectional view of the magnetic limiter cooling device, and Figure 4. is a cross-sectional view taken along line B-B in Figure 2, Figure 5 is a horizontal cross-sectional view of a conventional magnetic limiter cooling device, Figure 6 is a cross-sectional view taken along line CC in Figure 5 showing the state of processing by a robot, and Figure 7 is a cross-sectional view taken along line CC in Figure 5. 1 is a horizontal cross-sectional view of a magnetic limiter cooling device according to an embodiment of the present invention. 1... Vacuum vessel, 6... Magnetic limiter cooling duct, 12... Supply pipe, 13... Discharge pipe.

Claims (1)

[Claims] 1. A metal magnetic limiter cooling duct disposed inside a vacuum vessel, one end of which is connected to the metal magnetic limiter cooling duct, and a refrigerant is supplied from outside the vacuum vessel to the metal magnetic limiter cooling duct. A magnetic limiter for a nuclear fusion device, comprising a metal supply pipe for supplying the metal, and a metal discharge pipe having one end connected to the metal magnetic limiter cooling duct and discharging the refrigerant from the metal magnetic limiter cooling duct to the outside of the vacuum vessel. In the cooling device, at least the metal magnetic limiter cooling duct side of the metal supply pipe and the metal discharge pipe has a double pipe structure in which one of them is an inner pipe and the other is an outer pipe, and the inner pipe portion A magnetic limiter cooling device for a nuclear fusion device, characterized in that the magnetic limiter is divided in its longitudinal direction and is detachably connected at the divided portions.