JPS5950955B2 - Torus type fusion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torus-type nuclear fusion device, and particularly to a support device for a toroidal magnetic field coil thereof.

First, the structure of a conventional torus-type nuclear fusion device will be explained with reference to FIGS. 1 and 2.

In these figures, reference numeral 1 denotes a torus-shaped vacuum vessel, and around this vacuum vessel 1, a plurality of toroidal magnetic field coils 2 are arranged at equal intervals in the torus direction.

These toroidal magnetic field coils 2 each have a central column 3
The vacuum container 1 is supported by a support arm 7 that protrudes inward from a support 6 that connects the lower mount 4 and the upper mount 5. has been done.

Also, around the vacuum vessel 1, plasma 8 inside the vacuum vessel 1 is placed.
A poloidal magnetic field coil 9 is arranged to control the poloidal magnetic field.

By the way, in the toroidal fusion device configured in this way, when a short circuit accident occurs in the toroidal magnetic field coil 2, an electromagnetic force is generated in the direction shown by the arrow in FIG. It tries to be pushed out in the direction of the outer diameter.

On the other hand, since the toroidal magnetic field coil 2 is normally operated in pulse mode, the energization cycle is repeated.

When the toroidal magnetic field coil 2 is energized, a centripetal force acts on the center of the torus and presses the center column 3 due to the electromagnetic force caused by the interaction between the toroidal magnetic field and the current flowing through the toroidal magnetic field coil 2, and there is no resistance loss during energization. Thermal expansion occurs as the temperature rises.

In addition, when the current is not energized, the thermal expansion disappears and the toroidal magnetic field coil 2 contracts, but the centripetal force also disappears, so it remains in the position at the time of thermal expansion and does not return to its original position. By repeating the energization cycle, a so-called ratchet effect occurs. There is a possibility that the toroidal magnetic field coil 2 gradually moves in the outer diameter direction.

In order to prevent this ratchet effect, it is necessary to provide some form of restoring force to push the toroidal magnetic field coil 2 back toward the center of the torus.

As for the magnitude of this restoring force, the toroidal magnetic field coil 2
It needs to be large enough to overcome the frictional force at the contact surface between the toroidal magnetic field coil legs and the lower pedestal 4, which support the load of the toroidal magnetic field coil 2. It is generally much smaller than the force pushing outward in the radial direction.

In addition, in order to provide the above-mentioned restoring force, it is most common to use a spring, but as the device becomes larger, the restoring force also increases, and it is difficult to design a spring suitable for this restoring force due to the limitations of the installation space. This will become stricter than the assembly restrictions.

Furthermore, it is almost impossible for this spring to support several times the necessary restoring force and the popping force at the time of a short circuit.

The present invention has been made in view of these points, and its object is to provide a torus-type nuclear fusion device having a function of imparting a restoring force to the above-described toroidal magnetic field coil and a function of preventing the toroidal magnetic field from jumping out.

In order to achieve this object, the present invention provides means comprising a spring or the like that applies a restoring force in the inner radial direction to the movement of the toroidal magnetic field coil in the outer radial direction due to thermal expansion, and It is characterized by separately providing means consisting of a stopper member or the like that prevents protrusion in the outer radial direction in the event of a short circuit without inhibiting movement in the direction.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

FIG. 4 is a side view of a main part showing a toroidal magnetic field coil support device of a torus-type nuclear fusion device according to an embodiment of the present invention, and FIG. 5 is an enlarged sectional view of a main part showing the detailed structure of the inner diameter side support part. be.

In the lower part of the toroidal magnetic field coil 2, the inner leg 10 is supported by the toroidal magnetic field coil pedestal 12, and the outer leg 11 is supported by the lower pedestal 4.

On the outer diameter side end surface of the pedestal 12, the contact plate 13 has a coil spring 14,
It is attached by a support bolt 16 via a coil spring holding plate 15, and the upper end of the contact plate 13 is in contact with the outer end surface of the inner leg 10.

Therefore, an elastic biasing force in the inner diameter direction of the coil spring 14 is applied to the inner diameter side leg portion 10 via the contact plate 13, and a restoring force against movement in the outer diameter direction due to thermal expansion of the toroidal magnetic field coil 2 is provided.

In this case, the amount by which the toroidal magnetic field coil 2 extends in the outer radial direction due to thermal expansion must be absorbed by the deflection of the coil spring 14, so this amount of deflection must be taken into consideration when designing the coil spring 14.

Incidentally, since the coil spring 14 is attached to correspond to the inner leg portion 10 of the toroidal magnetic field coil 2 where thermal expansion is small, this is advantageous in terms of its design.

A key 17 is also provided in the hole 18 provided on the top surface of the pedestal 12.
is firmly inserted, and the inner diameter side surface of the upwardly protruding portion of the key 17 faces the outer diameter side wall surface of the notch 19 of the inner diameter leg portion 10 with a gap 20 interposed therebetween.

The dimension δ of the gap 20 is determined in correlation with the allowable deflection amount of the coil spring 14 and the amount of thermal expansion of the toroidal magnetic field coil 2.

That is, when the toroidal magnetic field coil 2 is short-circuited, the key 17 effectively acts to prevent the toroidal magnetic field coil 2 from jumping out only when the toroidal magnetic field coil 2 protrudes in the outer diameter direction by the gap 200 dimension δ.

Since the displacement of the toroidal magnetic field coil 2 with a dimension of less than 6 will be absorbed by the coil spring 14, the coil spring 14 is strong enough to withstand even if it absorbs a deflection of a dimension δ while providing the necessary restoring force. It is necessary to design

By providing the gap 20 having the dimension δ in this manner, the key 17 does not prevent the movement of the toroidal magnetic field coil 2 in the outer radial direction due to thermal expansion, and the key 17 only prevents the toroidal magnetic field coil 2 from jumping out in the event of a short circuit. This not only facilitates the design of the key 17 but also facilitates the insertion of the key 7 into the hole 18.

As shown in FIG. 6, the key 17 may be driven in common across both cutout portions 19 provided opposite to the inner leg portions 10 of adjacent toroidal magnetic field coils, or in the seventh
As shown in the figure, any method may be used in which each toroidal magnetic field coil is driven into the notch 19 provided in the inner leg 10 of each toroidal magnetic field coil.

Furthermore, as the required restoring force increases, instead of a coil spring, a disc spring 21 as shown in FIG. 8, or a disc spring 21 as shown in FIGS. It is effective to use a leaf spring 23.

In addition, in FIG. 8, 22 is a plate spring holding plate, and in FIGS. 9 and 10, 24 is a plate spring holding plate.

Furthermore, in order to provide restoring force, a first
A ring 25 as shown in FIG. 1 may also be used.

That is, the ring 25 has a ring shape in the toroidal direction, and is commonly fitted to the inner diameter end portion 10 of each toroidal magnetic field coil by shrink fitting or the like, thereby generating a restoring force in the centripetal direction.

In addition, 26 in the figure is a locking key for removing the ring.

Here, the dimension δ of the gap 20 is determined in correlation with the strength constraints of the ring 25 and the amount of thermal expansion of the doloidal magnetic field coil 2, as in the case of using a spring.

In addition, it is almost impossible to support the popping force of the toroidal magnetic field coil when it is short-circuited only by the ring 25 due to space constraints, so in this case as well, the key 17 Let's share it.

In addition, in each of the above embodiments, the key 17 is fixed to the toroidal magnetic field coil holder 12, and a gap 20 is provided between the key 17 and the inner diameter leg part 10 of the toroidal magnetic field coil. The inner diameter leg 1 of the toroidal magnetic field coil
0, and a gap 20 may be provided between the toroidal magnetic field coil holder 12 and the toroidal magnetic field coil holder 12.

As described above, according to the present invention, the toroidal magnetic field coil can be provided with the function of imparting a restoring force and the function of preventing popping out, and can favorably support the toroidal magnetic field coil.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a conventional 1 to -rath type nuclear fusion device, Fig. 2 is a partially cutaway view of the same, Fig. 3 is an explanatory diagram showing the electromagnetic force generated when a toroidal magnetic field coil is short-circuited, 4
The figure is a side view of a main part showing a toroidal magnetic field coil support device of a 1.-Las type nuclear fusion device according to an embodiment of the present invention.
The figure is an enlarged sectional view of the main part showing the detailed structure of the inner diameter side support part, FIGS. 6 and 7 are sectional views taken along the line A-A of FIG. 5 in different embodiments, and FIGS. 8 and 9. and the first
0, FIG. 11, and FIG. 12 show other different embodiments of the present invention, and FIG. 8, FIG. 9, FIG.
FIG. 12 is an enlarged sectional view of a main part corresponding to FIG. 5, and FIG. 10 is a side view of FIG. 9. 1... Vacuum container, 2... Toroidal magnetic field coil, 10... Inner diameter side leg of toroidal magnetic field coil, 12... Toroidal magnetic field coil pedestal, 13...Plate, 14...Coil spring, 17...Key, 21...Disc spring, 2
3...Plate spring, 25...Ring.

Claims (1)

[Scope of Claims] 1. A device comprising a torus-shaped vacuum vessel and a plurality of toroidal magnetic field coils arranged at predetermined intervals in the torus direction around the vacuum vessel, wherein the toroidal magnetic field coil means for applying a restoring force in the inner radial direction against movement in the outer radial direction due to thermal expansion of the toroidal magnetic field coil; A torus-type nuclear fusion device characterized in that each device is provided with a blocking means. 2. The torus-type nuclear fusion device according to claim 1, wherein the restoring force imparting means comprises a spring device. 3. The torus-type nuclear fusion device according to claim 1, wherein the restoring force imparting means comprises a ring member commonly fitted to each of the toroidal magnetic field coils. 4. In claim 1, the popping-out prevention means is fixed to either the toroidal magnetic field coil or a support part that supports the toroidal magnetic field coil, and the toroidal magnetic field coil has an outer diameter smaller than the other one. A torus-type nuclear fusion device characterized by comprising stopper members facing each other with a predetermined gap so as to be movable in a direction.