JPS6357755B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a vacuum wall piping penetration device for a nuclear fusion device.

[Technical background of the invention]

A conventional example will be explained with reference to FIGS. 1 and 2. FIG. 1 is a toroidal sectional view of a toroidal plasma containment vessel. In the figure, 1 indicates a toroidal vacuum container. Plasma 2 is formed within this vacuum container 1 . A blanket 3 and a shield 4 are provided inside the vacuum vessel 1 so as to surround the plasma 2. Further, numeral 5 in the figure is a limiter, and the generated charged particles come into contact with this limiter 5 and are neutralized. Cooling pipes 6 and 7 are connected to the blanket 3 and limiter 5, respectively, so that a coolant for cooling the blanket 3 and limiter 5 flows therethrough. The cooling pipes 6, 7 are composed of inner pipes 6A, 7A and outer pipes 6B, 7B with a vacuum wall 8 on the outer circumferential side of the vacuum container 1 as a boundary, and are welded together outside the vacuum wall 8. .

That is, as shown in FIG. 2, the inner pipe 6A passes through the through hole 8 of the vacuum wall 8, makes a part of it protrude outside the vacuum wall 8, and is welded to the vacuum wall 8. The outer pipe 6B is abutted against and welded to the tip end surface protruding from the vacuum wall 8.
The inner pipe 7A and the outer pipe 7B have a similar joining structure.

[Problems with background technology]

Generally, in a nuclear fusion device, the blanket 3, shield 4, limiter 5, etc. are subject to radiation damage due to neutrons, radiation, charged particles, etc. generated from the plasma 2.
Periodic replacement or overhaul is required due to corrosion or repeated stress. Therefore, in order to take out the blanket 3, shield 4, limiter 5, etc. from the vacuum vessel 1, the cooling pipe 6,
7 must be frequently cut and connected outside the vacuum wall 8. Furthermore, since the fusion device is radioactive at the time the above work is performed, both cutting and welding must be performed using automatic equipment. However, with the joint structure of the cooling pipes 6, 7, positioning after cutting is difficult, and by repeating cutting and welding, the portions of the inner pipes 6A, 7A that protrude outside the vacuum wall 8, which would be the margin for scratching, are reduced. Put it away. Therefore, it is difficult to use automatic equipment such as automatic cutters and automatic welders. Furthermore, inner pipes 6A, 7A and outer pipes 6B, 7B
There was a problem that a vacuum boundary had to be formed in both.

[Purpose of the invention]

The purpose of the present invention is to improve the efficiency of repeated cutting and welding operations, enable the use of automatic equipment such as automatic cutters and automatic welders, and improve reliability in vacuum boundaries. An object of the present invention is to provide a vacuum wall piping penetration device.

[Summary of the invention]

In order to achieve the above object, the present invention has an inner pipe that penetrates the vacuum wall of a vacuum container and leads out of the vacuum container at one end, and an inner pipe that is provided coaxially with the inner pipe and has one end that is airtightly connected to the vacuum wall. It comprises a connected outer pipe, and a tubular welding seat provided between the outer pipe and the inner pipe, one end of which is welded to the vacuum wall, and the other end of which is welded to the outlet of the inner pipe. It is characterized by this.

Therefore, when connecting and cutting the tip of the inner pipe and the welding seat, the tips of both must be cut off and welded again at the tips, which makes positioning easier than conventional butt welding. Since there is sufficient cutting margin, it is easy to use automatic equipment such as automatic cutters and automatic welders. Furthermore, since the outer pipe does not become a component of the vacuum boundary, its reliability as a vacuum boundary is improved.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. 3 is a toroidal sectional view of the toroidal plasma containment vessel. In the figure, 101 indicates a toroidal vacuum container. This vacuum container 101
A plasma 102 is formed inside. Then, a blanket 1 is placed to surround this plasma 102.
03, a shield 104 is provided within the vacuum container 101. Further, 105 in the figure indicates a limiter. The generated charged particles are transferred to this limiter 10.
The structure is such that it is neutralized when it comes into contact with 5. Cooling pipes 106 and 107 are connected to the blanket 103 and limiter 105, respectively, so that a coolant for cooling the blanket 103 and limiter 105 flows therethrough. The cooling pipes 106 and 107 are connected to the vacuum vessel 101.
Inner pipes 106A, 107A outer pipes 106B, 107
It is composed of B.

That is, as shown in FIG.
A penetrates through the through hole 108A of the vacuum wall 108, and a portion thereof protrudes outside the vacuum wall 108.
At this time, the inner pipe 106A and the through hole 108A
In order to prevent sticking due to friction with the inner surface, the through hole 108A is coated with solid lubricating oil. A bellows 1 as a receptacle is arranged so as to surround the protruding portion of the inner pipe 106A.
09 is provided outside the vacuum wall 108. The tip surface of this bellows 109 and the inner pipe 106A
The bellows 109 is welded to the end surface of the inner pipe 106A to form a vacuum boundary, and at the same time, the bellows 109 is configured to absorb thermal expansion of the inner pipe 106A. Note that the above-mentioned joint portion is provided with a sufficient cutting margin necessary for repeated cutting and welding. Flanges 110 are provided at both ends to surround the bellows 9.
A, 110B short tube 110 is the vacuum wall 108
is attached to. An outer pipe 106B is welded to the opposite side of the short pipe 110 from the vacuum wall 108. and the flange 11 of the short pipe 110
0 and the flange 111 of the outer pipe 106B are both configured to provide sufficient margin for cutting and welding repeatedly.

Also, in the case of the inner pipe 107A and outer pipe 107B of the limiter 105, the above-mentioned blanket 1
03 inner pipe 106A, outer pipe 106B
The structure is similar to that of .

The case where the cooling pipes 106 and 107 are cut in order to replace or disassemble the blanket 103, shield 104, limiter 105, etc. in the above vacuum wall 108 penetrating structure will be described. First, the welded portion between the outer pipe 106B and the short pipe 110 is cut off using an automatic cutter. Now the outer pipe 106
B can be removed. Next, inner pipe 1
Cut off the welded part between 06A and bellows 109 using an automatic cutter. This releases the connection between the inner pipe 106A and the vacuum wall 108. Inner pipe 107
A. Cut the outer pipe 107B in the same manner.
Then, if the vacuum wall 108 is removed, the vacuum container 1
From inside 01, blanket 103, shield 104
Also, the limiter 105 and the like can be taken out.

Next, a case will be described in which the blanket 103, the shield 104, the limiter 105, etc. have been replaced or disassembled and repaired, and then they are installed in the vacuum vessel 101 again and the cooling pipes 106 and 107 are connected. First, the inner pipe 106A and the outer pipe 106
Align the groove with B. This groove alignment can be easily performed by expanding and contracting the bellows 109.
After cutting the margin, welding is performed using an automatic welder. Then, the end surface of the outer pipe 106B is aligned with the flange 110B of the short pipe 110. Then, after cutting the margin, weld it using an automatic welder. The cooling pipe 106 is then connected. Cooling pipe 10
The same applies to case 7.

That is, the inner pipe 106A and the bellows 109
The welded part between the outer pipe 106B and the short pipe 11
Sufficient cutting margin is provided for both the welded part with the inner pipe 106A and the bellows 10.
Since the welding part with 9 is the tip surface of both, weldability is extremely good and it is easy to use an automatic welder. Similarly, in the case of cutting, it is easy to use an automatic cutter. Further, since the inner pipe 106A and the bellows 109 constitute a vacuum boundary, and the outer pipe 106B is not a component of the vacuum boundary, its reliability as a vacuum boundary is also high. Furthermore, the thermal expansion of the inner pipe 106A can be absorbed by the expansion and contraction of the bellows 109, thereby improving safety.

In the above embodiment, the outer pipe 106B was connected to the vacuum wall 108 via the short pipe 110, but the fifth
As shown, the outer pipe 106B may be bolted directly to the vacuum wall 108. At this time, an O-ring 112 provides airtightness between the outer pipe 106B and the vacuum wall 108. This is because the connection between the vacuum wall 108 and the outer pipe 106B is not a location where a vacuum boundary is formed.

〔Effect of the invention〕

As explained above, the present invention includes an inner pipe that penetrates the vacuum wall of a vacuum container and leads out of the vacuum container at one end, and an inner pipe that is provided coaxially with the inner pipe and has one end hermetically connected to the vacuum wall. and a tubular welding seat provided between the outer pipe and the inner pipe and having one end welded to the vacuum wall and the other end welded to the outlet of the inner pipe. It is possible to repeatedly cut and connect the piping that penetrates the vacuum wall of the vacuum vessel, and it is possible to easily replace blankets and the like during periodic inspections of the fusion device.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing a conventional example. Figure 1 is a sectional view showing a vacuum wall penetrating part of a cooling pipe for a blanket in a torus-shaped vacuum container, and Figure 2 is a diagram showing a vacuum wall penetrating part of a cooling pipe for a blanket. FIGS. 3 and 4 are views showing an embodiment of the present invention. FIG. 3 is a cross-sectional view of a torus-shaped vacuum container, and FIG. 4 shows a vacuum wall penetration part of a cooling pipe for a blanket. FIG. 5 is a cross-sectional view showing another embodiment of the present invention, and is a cross-sectional view showing a vacuum wall penetrating portion of a cooling pipe for a blanket. 108...Vacuum wall, 108A...Through hole in vacuum wall, 106A, 107A...Inner pipe, 106
B, 107B...outer pipe, 109...bellows (welding seat).

Claims (1)

[Scope of Claims] 1. An inner pipe that penetrates the vacuum wall of the vacuum container and leads out of the vacuum container at one end, and an outer pipe that is provided coaxially with the inner pipe and has one end hermetically connected to the vacuum wall. A pipe, and a tubular welding seat provided between the outer pipe and the inner pipe, one end of which is welded to the vacuum wall, and the other end of which is welded to the outlet of the inner pipe. Vacuum wall piping penetration device for nuclear fusion equipment. 2. The vacuum wall piping penetrating device for a nuclear fusion device according to claim 1, wherein the welding seat is comprised of a metal bellows.