JPS6136689B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torus-shaped nuclear fusion device, and more specifically, to a toroidal coil device having a plurality of coils arranged in a torus shape and divided into upper and lower parts, and in particular to its electromagnetic force support structure. It is something.

Generally, torus-shaped fusion devices are shown in Figures 1 and 2.
As shown in the figure, it is composed of a vacuum vessel 2, a plurality of toroidal coils 1, an air-core current transformer coil 3, a poloidal coil 4, and the like. The vacuum vessel 2 has a trapezoidal or circular donut-shaped cross section, and the plasma P is confined therein by magnetic fields in the toroidal direction, poloidal direction, and perpendicular direction. The plasma P is heated by an air-core current transformer coil 3 wound near the vacuum vessel 2.
This is done by generating an induced voltage and using the resulting current.

As can be seen from FIGS. 1 and 2, this nuclear fusion device is assembled with a toroidal coil 1, a vacuum vessel 2, and an air-core current transformer coil 3 interlaced with each other.
1A and 1B are joint parts of the toroidal coil 1 divided into upper and lower parts.

Therefore, when manufacturing the device, as shown in FIG. To divide into two,
It cannot be assembled unless one of these methods is used.

The conventional toroidal coil and the toroidal coil of the present invention also relate to a coil support structure of a structure in which the former toroidal coil is divided into two parts.

By the way, a toroidal magnetic field generating device of a torus-shaped fusion device generally generates a toroidal magnetic field by passing a large current in the same direction through a plurality of coils arranged on a torus circle. The interaction between this magnetic field and the coil current generates a strong electromagnetic force in the toroidal coil. This electromagnetic force includes an expansion force F, a force (centripetal force) Fr that tries to gather all the toroidal coils toward the center, and a force that tries to topple the coils.In a toroidal magnetic field generator, the electromagnetic force generated in the coils The problem is how to support the force and how to reduce the stress generated in the coil.

In order to deal with such problems, conventional devices have structures shown in FIGS. 3 and 4.

That is, as shown in FIGS. 3 and 4, the toroidal coil 1 is housed in a coil support frame 5 made of SUS or the like so as to withstand the strong electromagnetic force generated in the coil. The coil support frame 5 includes an upper support 5b, a lower support 5a, and both supports 5 so as to withstand the thermal force of the coil 1 due to its own weight and the electromagnetic force F, Fr.
a, 5b, and a wedge-shaped surface T.
It has a coupling part 5d having a. Hereinafter, it will be abbreviated as the support frame 5 as appropriate. A plurality of coils housed in the support frame 5 are arranged in a toroidal direction, with the inner side of the support frame 5 facing the center, and force is applied from behind the coils using a hydraulic jack or the like to accurately gather the coils radially.
The wedge-shaped surfaces T formed on both sides of the joint portion 5d provided inside each support frame 5 are brought into close contact with each other, and the centripetal force
In order to accurately hold the Fr through the wedge-shaped surface T, the mount 7 is tightened with a tightening bolt 6, but as the size of the equipment increases recently, the toroidal coil size becomes larger. Even if an attempt was made to support the centripetal force Fr by creating a wedge effect on the wedge-shaped surface of the support frame using a special tool such as a hydraulic jack set on the pedestal to gather the coil support frame, the hydraulic jack force on the pedestal would be insufficient due to the large overall height of the coil. However, it is impossible to maintain the pressing force over the entire height of the coil support frame, and the wedge effect can only be obtained near the lower part of the coil support frame.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional one, and involves providing a cylinder surrounding the wedge-shaped joint of the toroidal coil support frame, and driving a wedge between the coil support frame and the cylinder. Therefore, it is an object of the present invention to provide a toroidal coil device which can support strong centripetal force by bringing adjacent coil support frames into close contact with each other and by the wedge effect generated between the support frames.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 5, reference numeral 8 is an FRP cylinder that is divided into three parts in the height direction and has a flange 81 at the divided part, and the divided cylinders are designated with numerals 8a to 8c to distinguish them as appropriate. 9 indicates a wedge made of non-magnetic metal, FRP, etc. The wedges 9 are provided corresponding to the respective cylinders 8a to 8c, and are designated by reference numerals 9a to 9c to distinguish them.

Note that two wedges 9a are provided, and the two wedges 9a are joined to each other via their tapered surfaces. The same applies to the wedges 9b and 9c.

10 is a spacer provided between each of the wedges 9a to 9c. Reference numerals 10a to 10c are attached to distinguish them as appropriate.

FIG. 6 is a - cross section of FIG. 5. When installing the toroidal coil 1 and the pedestal 7, first install a plurality of lower support frames 5a and gather them together near the center with jacks, etc. Next, install the lowest cylinder 8a and attach the coil support frames 5. It surrounds the lower part of the joint part 5d. Thereafter, the spacer 10a is inserted between the coil support frame 5 and the cylinder 8a. Then, by driving the wedges 9a, a plurality of wedge-shaped surfaces T of the cylinder 8a are brought into close contact with each other. Thereafter, the central cylinder 8b, the spacer 10b, and the wedge 9b are sequentially installed, and the same procedure is applied to the uppermost portion.

Here, it is preferable to use a special pneumatic or hydraulic tool to drive the wedge 9.

In this embodiment, the cylinder 8 is divided into three parts, but depending on the size of the device, electromagnetic force, etc., the number of divisions may be changed so that the strength of the wedge 9 can be adjusted to produce a force appropriate to the overall height of the coil support frame 5. It can be communicated to each department.

In this way, in response to the centripetal force Fr that tends to direct the entire plurality of toroidal coils 1 toward the center of the strong electromagnetic force applied to the toroidal coil 1, the coil support frame joint portion is By providing a cylinder 8 made of FRP on the outer periphery of 5d and driving a wedge 9 between this cylinder 8 and the support frame 5, the plurality of coil support frames are brought into close contact with each other toward the center, and the tapered surface of the support frame 5 is The electromagnetic force can be supported through T.

In the embodiment, an example is shown in which the cylinder 8 surrounds the joint portion 5d of the coil support frame 5 over almost its entire height, but the cylinder 8 may also be configured to surround only the central portion of the joint portion 5d, for example. You can get some effect.

Further, in the embodiment, an example is shown in which a split type cylinder 8 is used, in which the cylinder 8 is divided in the height direction of the support frame 5, but a non-divided type cylinder 8 may be used.

In addition, in the above embodiment, FRP was used as the material for the cylinder 9, but a structure with electrical insulation in the circumferential direction was used.
Non-magnetic steel such as SUS may also be used.

As described above, according to the present invention, a plurality of toroidal coil support frames are closely attached to each other by providing a circular coupling cylinder of the coil support frame and providing a wedge mechanism between the coil support frame and the support frame during coil assembly. Furthermore, the support steel strength at the wedge-shaped joint of the support frame can be improved, which has the effect of increasing the mechanical strength of the device.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the outline of a torus-shaped fusion device, Figure 2 is a plan view of the one shown in Figure 1, and Figure 3 is a diagram showing the outline of a torus-shaped fusion device.
The figure shows a side view of a conventional toroidal coil device.
4 is a plan view of what is shown in FIG. 3, FIG. 5 is a side view showing a toroidal coil device according to an embodiment of the present invention, and FIG. 6 is a partial sectional view taken along the line - in FIG. 5. In the figure, 1 is a toroidal coil, 5 is a coil support frame, 8 is a cylinder, 9 is a wedge, and 10 is a spacer. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A plurality of coil support frames that house coils therein and have wedge-shaped joints at their inner ends, which are provided so as to surround the wedge-shaped joints, and which connect adjacent coil support frames to each other. A cylindrical body that integrates a plurality of coil support frames into a torus shape by connecting them through a wedge-shaped joint.
and a toroidal coil device comprising a wedge mechanism provided between the cylindrical body and the wedge-shaped connecting portion of the coil support frame to tightly connect the coil support frames to each other. 2. The toroidal coil device according to claim 1, wherein the cylindrical body is configured to surround the wedge-shaped joint portion of the coil support frame over almost its entire height. 3. The toroidal coil device according to claim 1 or 2, wherein the cylindrical body is made of reinforced fiber resin. 4. The cylindrical body has a split structure in which it is divided into a plurality of parts in the height direction of the coil support frame, and the wedge mechanism is provided between each of the plurality of divided cylindrical bodies and the joint part of the coil support frame. A toroidal coil device according to any one of claims 1 to 3, characterized in that: