JPS6022486B2 - Toroidal coil holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a toroidal coil holding device for a toroidal fusion device.

FIG. 1 is a plan view showing a part of a toroidal coil device of a nuclear fusion device, and FIG. 2 is a sectional view taken along the line 0-0 in FIG.

Reference numeral 1 denotes an annular toroidal coil, which is housed in a support frame 3, and a large number of toroidal coils are arranged circumferentially surrounding an annular vacuum vessel 13.

Plasma P is confined within the vacuum container 13 by the magnetic field created by the toroidal coil 1. The retaining device for the secondary toroidal coil was shown in cross-section in FIG.

4 is a support frame made of non-magnetic steel such as stainless steel, and a toroidal coil is inserted into the receiving groove 4a.

The toroidal coil 1 is configured as follows. A pancake coil 2 is formed by winding the coil conductor 3 a required number of times while inserting an interlayer insulating material 7.

Next, insulating spacing pieces 8 are inserted radially between each pancake coil 2, and the pancake coils 2 are stacked in several stages in all directions. The pancake coils 2 are connected to each other by welding, brazing, or the like, using crossover wires (not shown) between adjacent pancake coils 2 on the inner pot side and on the outer diameter side. The toroidal coil 1 constructed by stacking multiple coils in this way is connected to the ground insulating spacers 9, 10.
into the receiving groove 4a of the support frame 4 in which the
Taper wedges 11 and 12 are driven into the gaps between the outer cover portion of each pancake coil 2 and the inner circumference of the support frame 4 at a plurality of locations in the circumferential direction and at several stages in the axial direction. In this way, the toroidal coil 1 is firmly held within the support frame 4, and the electromagnetic force applied to the coil is received by the support frame 4. However, as nuclear fusion devices have recently become larger in size, the conventional holding devices described above are no longer able to cope with the strong electromagnetic force.

That is, as shown in a partial cross-sectional view in FIG. 4, if the outer diameters of the pancake coils 2 are uneven, the gaps S, , S2 with the inner circumference of the support frame 4 will be Even if the tapered wedges 11 and 12 were driven in from the direction of arrow B, they could not be pressed against the large gap S2. Furthermore, even if the thickness of the interlayer insulating material 7 is adjusted and each pancake coil 2 is wound up so that the outer diameter of the coil is the same as shown in a partial cross-sectional view in FIG. The taper wedges 11 and 12 at points a and b are
It is pressed by driving the taper wedges 11 and 12 at the location,
This resulted in a weakening of the wedge pressing force. As described above, in the conventional device, there are parts where the toroidal coil 1 is insufficiently pressed and held, and there is a risk that the coil may be damaged. In this invention, the tapered wedge is driven into the receiving groove of the support frame, corresponding to the outer flanges of each pancake coil,
A plurality of steps are provided by gradually decreasing the inner diameter toward the back, and the insulating spacing pieces between the coils are made to protrude from the outer cover of the pancake coil, and the tapered wedge of each lower layer is sandwiched between the two insulating spacing pieces. The shaft is received in all directions, and the tapered wedges of each upper layer corresponding to the tapered wedges of each lower layer are driven in, so that the tapered wedge of each stage does not affect the other stages, even if the finished outer diameter of each pancake coil is different. The object of the present invention is to provide a holding device for a toroidal coil that is firmly pressed and supported by driving a tapered wedge, respectively.

FIG. 6 shows an embodiment of the present invention.

FIG. 3 is a sectional view corresponding to FIG. 3 showing a holding device for an idal coil, in which numerals 2, 3, 5 to 7, and 9 are the same as those of the conventional device. The insulating spacing pieces 21 inserted radially between each pancake coil 2 have a length that protrudes from the coil outer part, and these pancake coils 2 are connected by a crossover wire (not shown), and the toroidal coil 20 is configured.

An annular receiving groove 24 is provided in the annular support frame 23. Corresponding to the outer flanges of each pancake coil 2 in this accommodation groove, the inner diameter is sequentially adjusted to 4mm in the direction toward the back.
A stepped portion 24a is formed. Reference numerals 25 and 26 indicate a pair of tapered wedges in the upper and lower layers, which are arranged between the outer diameter part of each pancake coil 2 and the inner circumference part of the corresponding accommodation groove 24 in each stage in the circumferential direction. Arranged in multiple locations.

These tapered wedges 26 in the upper layer of the valley correspond to the gaps that become larger as they approach the entrance side of the accommodation groove 24.
The thickness is gradually increased. Each of the lower tapered wedges 26 is fixed to the outer diameter of the pancake coil 2 with an adhesive or the like, and is sandwiched between both insulating spacing pieces 21 to prevent it from shifting in the rutting direction. The toroidal coil 20 is assembled and held as follows. A toroidal coil 1 configured by stacking a plurality of pancake coils 2 in several stages with insulation spacing pieces 21 in between is placed in a housing groove 24 of a support frame 23 in which ground insulation spacing pieces 9 and 22 are arranged.
Put it inside.

The upper layer taper wedge 26 is driven into the housing groove 24 from the deep stage and extends to the upper stage. This Boopa wedge 26 hits the stepped portion 24a by driving and does not push down the lower tapered wedges 25, 26. Note that even if the taper wedge 26 is driven in until it hits the stepped portion 24a, if the pressing force is insufficient, the taper wedge 26 and the accommodation groove 24
An adjustment liner (not shown) made of a plate material is inserted between the inner circumferential part of the cylinder and the inner circumference of the cylinder.

In this way, even if the respective pancake coils 2 have different outer diameters, firm pressing support is provided by driving the tapered wedges 26 in the upper layer at the respective locations.

In the toroidal coil 1 held by the holding device in this way, even if a strong electromagnetic force is generated, the force is smoothly transmitted from the coil conductor 3 to the support frame 23 and is firmly received, and the force is firmly received by the conductor 3 and the insulator. It can reduce the stress generated in

Furthermore, slippage between the coil conductors 3 is also prevented, and the life of the insulator is greatly extended. Note that the coil conductor 3
Although normal electrolytic copper is used in this example, a superconducting wire can also be used, and the same effects as in the above embodiment can be obtained.

As described above, according to the present invention, the inner circumferential portion of the accommodation groove of the support frame corresponds to the outer cover portion of each pancake coil.
The inner diameter is gradually reduced toward the back to provide multiple steps, and the insulating spacer pieces between the coils are made to protrude from the outer light part of the pancake coil, and the tapered wedges of each lower layer are sandwiched between the insulating spacer pieces to form each pancake. The outer flanges of the coils are applied, and the corresponding taper wedges of each upper layer are driven between the inner circumferential portions of the housing grooves, so that by driving the upper wedges, the lower taper wedges are driven in. The pancake coils in each stage are firmly pressed and held from the outer cover without affecting the wedge.

Therefore, even if the outer diameters of the respective pancake coils are different, they can be firmly held without any problem. This reduces the stress generated in the coil conductor and insulator, allowing reliable use over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a part of the toroidal coil pupil of the nuclear fusion device, Fig. 2 is a cross-sectional view taken along the Rolo line in Fig. 1,
Figure 3 is a second diagram showing a conventional toroidal coil holding device.
The cross-sectional view taken along the line m-m in the figure, Figures 4 and 5 are
FIG. 6 is a partial cross-sectional view showing the disadvantages of driving the tapered wedge of the holding device shown in the figure, and FIG. 6 is a cross-sectional view corresponding to FIG. 3 showing the holding layer of the toroidal coil according to an embodiment of the present invention. 2... Pancake coil, 20... Toroidal coil,
21...Insulating spacing piece, 22...Ground insulation spacing piece, 23...Support frame, 24...Accommodating groove, 24a...Stepped part, 25... Lower layer taper wedge, 26... Upper layer taper wedge. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 1 Figure 2 Figure 4 Figure 5 Figure 3 Figure 6

Claims (1)

[Claims] 1. A toroidal coil configured by stacking a plurality of pancake coils in multiple stages in the axial direction with a plurality of insulating spacing pieces arranged radially between them is housed in a housing groove provided in a support frame. , a device configured to drive and hold upper and lower tapered wedges in pairs at multiple locations in the circumferential direction in the gaps between the outer diameter portion of each of the pancake coils and the inner circumference portion of the accommodation groove; In the inner circumferential portion of the accommodation groove, a plurality of steps are provided, each corresponding to the outer diameter portion of each of the pancake coils, with the inner diameter gradually decreasing toward the back, and each of the insulating spacing pieces project from the outer diameter of the pancake coil, and place the tapered wedges of each lower layer on the outer diameter of the pancake coil in each stage, sandwiching them between the protruding parts of the insulation spacing pieces on both sides, and A toroidal coil holding device characterized in that a tapered wedge of each upper layer corresponding to the wedge is driven between the inner circumferential portion of each stage of the accommodation groove and fixed by pressure for each pancake.