JPS6138604B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a torus-shaped nuclear fusion device that includes:
This relates to a toroidal coil in which a plurality of coil conductors are arranged in a torus shape and are divided into upper and lower parts and are connected at a joint.

Generally, a torus-shaped nuclear fusion device is comprised of a vacuum vessel 2, a plurality of toroidal coils 1, an air-core current transformer coil (poloidal coil) 3, etc., as shown in FIGS. 1 and 2. Vacuum container 2
has a trapezoidal or circular donut shape in cross section, and the plasma 4 is confined therein by magnetic fields in the toroidal direction, poloidal direction, and perpendicular direction. Heating of the plasma 4 is performed by generating an induced voltage in the plasma 4 by an air-core current transformer coil 3 wound around the vacuum vessel 2, and by using a current generated by the induced voltage.

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.
5A and 5B are joint parts of the toroidal coil 1 divided into upper and lower parts.

Therefore, when manufacturing the device, as shown in FIG.
It cannot be assembled unless one of the following methods is used: divide it into two in the torus direction (circumferential direction).

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

The conventional joint between the two halves of a toroidal coil has been a frictional joint using a bolt tightening force as shown in FIG. 3, or a pin joint as shown in FIG.

First, the prior art shown in FIG. 3 will be explained.

The toroidal coil 1 is wound with a coil conductor 6 in several turns. 11 is interlayer insulation. At the joint portion 5A of the conductors 6a and 6b, which are divided into two parts, the two coil conductors 6a and 6b are collectively tightened using a tightening bolt 7 and a nut 8, thereby forming an integrated toroidal coil 1. 60 is a through hole in the thickness direction of the coil conductors 6a and 6b in the joint portion 5A, 9 is an insulating washer, and 10 is an insulating tube. Note that the tightening bolt 7, insulating tube 10, insulating washer 9, and nut 8 are also provided on the joint 5B side in the same way as on the joint 5A side.
are tightened and connected.

However, with the recent progress in nuclear fusion research, the current flowing through the toroidal coil 1 has increased,
The electromagnetic force acting on the toroidal coil 1 also becomes stronger. To this end, the toroidal coil is usually enclosed and supported by an outer shell (not shown). on the other hand,
The toroidal coil 1 thermally expands due to Joule heat, but because it is restrained by the outer frame, a large compressive force is accumulated inside the toroidal coil 1, and this force is
Overcoming the frictional force at the joints 5A and 5B, the toroidal coil 1 slips at the joints 5A and 5B. This slippage occurs repeatedly in response to fluctuations in the value of the current flowing through the toroidal coil 1. Due to the long-term operation of the nuclear fusion device, this repeated slippage causes 2
The divided upper and lower coils are connected to the contact surface 1 of the joint part.
At 2, it seizes and becomes restricted and cannot slide. Therefore, a large compressive force is repeatedly applied to the toroidal coil 1, leading to fatigue failure of the conductor.

In addition, in the example of Fig. 4, the frictional force of the joint and the pin 1
It has a structure that can withstand electromagnetic force due to shear strength of 3 and compressive force due to heat.

The pin 13 is inserted into each turn via an insulator 14 so as not to short-circuit each turn.

In this structure, as the device becomes larger, pin 1
3 from the side of the central axis space S of the device in the direction of the conductor thickness, and it has become very difficult to tightly connect the conductors 6a and 6b in terms of size and space. In addition, a large amount of money is required for jigs and tools to insert the pin 13 with high dimensional accuracy, resulting in an uneconomical structure.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional method, and it adopts a structure in which the dimensions of the insertion pieces inserted into each other at the joint part of the divided coil conductors can be adjusted in the joining direction. Therefore, it is an object of the present invention to provide a device that can easily and reliably join split-type coils.

An embodiment of the present invention will be described below with reference to the drawings. In Fig. 5, 6c and 6d are coil conductors with concave and convex joints, and their ends are connected to the sixth
The structure is as shown in FIG. That is, the coil conductor 6c has a convex joint M at its end, and the coil conductor 6d has a concave joint F at its end.
Furthermore, since the corner portion R at the tip of the convex joint M is cut off and chamfered as shown in the figure, the convex joint M is fitted into the concave joint F extremely smoothly. .

Incidentally, an insulating member 11c is provided on the coil conductor 6c.6d so as to cover the outer periphery of the coil conductor 6c.6d.

15 is a pin inserted for each turn, 16,1
7 and 18 are oval pin holes provided in each coil conductor, and as shown in Fig. 8, the central axis P-Q
The dimensions gradually become smaller from the side.

In addition, FIG. 8 shows a case where the coil conductors 6c and 6d have three turns, and the central axis P-
This is a view viewed from the Q side, that is, in the direction of arrow A in FIG.

FIG. 9 is a perspective view of the pin 15 inserted into the pin holes 16, 17, and 18, and as shown in the figure, the tapered pins 20 and 21 have their ends on the conductor side, that is, on the longitudinal side working together to form the oval holes. The opposing sides of the shape have tapered portions 20a and 21a on the left and right with the central portion in the length direction as the apex. Taper block 2
2 and 23 are tapered portions 20 of taper pins 21 and 22
The taper block 22 has a left-handed female thread, and the taper block 23 has a right-handed female thread. Taper blocks 22, 23 are integrally connected within pin holes 16, 17, 18 by double threaded studs 19. The pin 15 having the above structure is held together with an appropriate jig so that the pin 15 does not fall apart, and is inserted into the conductor to form the double screw stud 1.
For example, when the right-hand screw portion 19l of the pin 9 is turned to the right, the taper pins 20 and 21 will contract with respect to the oval holes, and will have clearances with respect to the oval pin holes 16, 17, and 18. Therefore, assembly of the joint becomes very easy.

Next, the operation of the double screw stud after the pin 15 is inserted into the coil conductors 6c, 6d will be explained.

If the tensile force acting on the joint is, for example, 10 tons, the force acting on the bolt is P/2tanα.
If α is 10°, it becomes 0.88 ton, and even if a slight tensile force is applied to the bolt, the taper effect can produce a pin force that counters the large tensile force.

For power transmission in this structure, there is no need to expect frictional force from the Zetsuen Bolt 7, and since the Zetsuen Bolt 17 reduces the contact resistance of the joint surface,
Its only function is to generate the necessary contact pressure on the contact surface.

In addition, since the pin 15 can be closely connected to the pin holes 16, 17, and 18, the conductors 6c, 6
The joints do not slip due to the elongation and contraction of d, providing a structure that is strong against damage to the contact surface as well as fatigue strength.

By the way, in joining the coil conductors 6c and 6d, since the structure of the conductor joining part is made uneven as described above, the degree of damage to the joint surface during joining is reduced compared to the conventional structure.

Pin holes 16, 1 provided in coil conductors 6c, 6d
If holes 7 and 18 are formed into oval holes of different sizes as shown in FIG. 8, the pin 15 can be easily inserted.

Furthermore, if the pin 15 is structured to consist of a double-threaded stud 19, taper pins 20, 21, and taper blocks 22, 23 as in the embodiment, the pin hole 16, 17, 18 will have a dimensional difference when inserted. By inserting it into the reduced hole with a gap, and turning 19 shown in Fig. 9 at a predetermined position,
It can be more effective for operation.

As described above, according to the present invention, since the insertion piece that can adjust the dimension of the coil conductor in the joining direction is inserted into the storage hole drilled in the joining part of the coil conductor, the work required for assembling the device is reduced. This has the effect of making it easier.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a torus-shaped fusion device with a conventional joint structure, Figure 2 is a plan view of the device shown in Figure 1, and Figures 3 and 4 are joints of a conventional toroidal coil. 5 is a diagram showing a toroidal coil joint according to the present invention, FIG. 6 is a perspective view showing a convex joint, FIG. 7 is a perspective view showing a concave joint, and FIG. 8 is a diagram showing a concave joint. A front view of the one shown in Figure 5,
FIG. 9 is a perspective view of the pin structure according to the present invention;
The figure is a schematic diagram of pin operation. In the figure, 1 is a toroidal coil, 2 is a vacuum container, 5A, 5B are joints, S is a space, 6a, 6
b, 6c, 6d are coil conductors, 15 is a pin, 16
~18 is an oval pin hole, 19 is a double screw stud,
20 and 21 are taper pins, and 22 and 23 are taper blocks. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A first and second coil conductor that are joined to each other at a joint provided at an end to form a coil, and a joint at the joint of the first and second coil conductors. a storage hole bored in a direction intersecting the direction, and an insertion piece inserted into the storage hole to restrict movement of the first and second coil conductors in the joining direction and to adjust dimensions in the joining direction. toroidal coil. 2. A plurality of first and second coil conductors each work together to form a multiple toroidal coil,
In addition, the size of the storage hole drilled in each joint is
The toroidal coil according to claim 1, wherein each turn is different. 3. The joint has a convex joint provided at the end of the first coil conductor, and an inner surface provided at the end of the second coil conductor and in sliding contact with the outer surface of the convex joint. The toroidal coil according to claim 1 or 2, comprising a convex joint portion and a concave joint portion that fits into the toroidal coil. 4. The toroidal coil according to any one of claims 1 to 3, wherein the perforation hole provided in the joint portion is formed to open in the shape of an elongated hole.