JPH0240196B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to the structure of a central support column of a tokamak-type nuclear fusion device.

[Prior art]

FIG. 1 is a sectional view showing an example of this type of nuclear fusion device, which is generally referred to as a tokamak type fusion reactor. In the figure, 1 is the first base, or base, 2 is the second base, or in this example, the foundation 3 is a central support column erected on the first base 1 via heat-insulating support legs 4, and 5 is the center. A plurality of toroidal coils are arranged around the support column 3 so as to be supported almost in close contact with the center support column 3, and 6 is a heat insulation support leg that supports these toroidal coils 5 on the first base 1 in heat insulation. be. 7 is a poloidal coil, which is supported by a central support column 3 and a support beam (not shown). 8 is a vacuum chamber whose interior is kept in vacuum.

Further, FIG. 2 shows a part of the center support column 3, where 9 is a center support column piece obtained by dividing the cylindrical center support column 3 into, for example, four parts in the circumferential direction, 10 is an electrically insulated dividing surface, Reference numeral 11 denotes a fitting portion having projections and depressions formed in order to combine the center support column pieces 9 into a single cylindrical column. This fitting portion is also electrically insulated.

Next, the operation will be explained. Plasma such as deuterium generated in the toroidal coil 5 by nuclear fusion is confined within the toroidal coil 5 by energizing the toroidal coil 5, and its position is controlled by the poloidal coil 7. Plasma is extracted as thermal energy.

In this way, when the toroidal coil 5 is energized, a strong electromagnetic force, that is, a centripetal force acts on the toroidal coil 5 toward the center of the device. The center support column 3 has the function of receiving this centripetal force and supporting the toroidal coil 5. In addition, in the poloidal coil 7, a current is passed through the plasma by a transformer action, and in order to control the position and shape of the plasma, a current that generally varies with time is passed intermittently. The current flowing through this poloidal coil 7 produces a magnetic flux that fluctuates over time.
This fluctuating magnetic flux passes through the central support column 3. For this reason,
Eddy currents are generated in the center support column 3 in the toroidal direction shown by the arrows in FIG. This eddy current is undesirable as it causes power loss and an error magnetic field, and must be reduced as much as possible. Therefore, as shown in FIG. 2, the center support column 3 is divided in the circumferential direction into a cylindrical shape, and the dividing surface 10 is electrically insulated. In addition, in order to maintain the rigidity required to support a strong electromagnetic force, the center support column piece 9 has a fitting portion 11 that engages with each other formed by concavities and convexities, and these are combined to form a single support column. ing.

Since the center support column 3 of the conventional tokamak type nuclear fusion device has the above-mentioned structure, the shape of the center support column piece 9 is complicated, requiring a lot of time for machining, and furthermore, it is difficult to fit the center support column 3. There were drawbacks such as high processing precision being required for the portion 11 and the like, and assembly was difficult.

[Summary of the Invention] The present invention has been made to eliminate the drawbacks of the conventional ones as described above, and includes a plurality of center support column pieces each having a cylindrical shape divided in the circumferential direction, and a plurality of center support column pieces arranged in a circumferential direction. A plurality of second fitting portions are provided at a predetermined interval in the axial direction and extend in the radial direction on the dividing surface of the center support column piece. The object of the present invention is to provide a central support column for a tokamak-type nuclear fusion device that has a simple structure and is easy to machine and assemble.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In Figures 3, 4 and 5, 12a
is the dividing surface 10 of the center support column piece 3 divided into seven parts, for example.
A plurality of first recesses 13a extending in the axial direction are provided at predetermined intervals in the axial direction of the dividing surface 10, and second recesses 12b extending in the radial direction are provided at the same intervals as the second recesses 13a in the axial direction. Hole 1 made in
3b is the first key, and 13c is the second key that is inserted into the hole 13b.

In the center support column of the tokamak type nuclear fusion device having the above structure, the center support column pieces 9 are gathered together to form a cylinder, and the adjacent first recesses 12 of the dividing surface 10 are
A first key 12b shown in FIG. 4 is inserted in the axial direction to form the first fitting part 12. Next, the second key 13c shown in FIG.
b to form the second fitting portion 13 in the radial direction. In this way, it has the first fitting part 12 in the axial direction and the second fitting part 13 in the radial direction, and each fitting has a simple structure, has high resistance to eddy current, and has a mechanical A central support column with a strong structure can be easily fabricated and assembled.

In addition, in the above embodiment, the first key 12b and the second
The structure was designed to be assembled using the key 13c, but the 6th
As shown in the figure, a first recess 12a extending in the axial direction provided in one dividing surface 10 of the center support column piece 9;
The other dividing surface 1 of the center support column piece 9 adjacent to this
After forming the first fitting part 12 by fitting the convex part 12c provided in the axial direction extending in the axial direction, the second fitting part 12 is formed.
Even if the fitting portion is formed by the second key 13c, processing and assembly are relatively easy.

Further, in the above embodiment, the center support column piece 9 is constructed by dividing the center support column 3 into seven parts, but the present invention is not limited to this.

〔Effect of the invention〕

As described above, according to the present invention, there are provided a plurality of center support column pieces each having a cylindrical shape and divided in the circumferential direction, and a first fitting portion provided on the dividing surface of the center support column pieces and extending in the axial direction. and a plurality of second fitting parts that are provided at predetermined intervals in the axial direction and extend in the radial direction on the dividing surface of the center support column piece, thereby making it mechanically strong and easy to machine and assemble. This has the effect of providing a central support pillar for a tokamak-type fusion device.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the overall structure of a tokamak-type fusion device, Fig. 2 is a perspective view showing a part of the central support column of a conventional tokamak-type fusion device, and Fig. 3 is an embodiment of the present invention. A perspective view showing a central support column of a tokamak-type nuclear fusion device according to an example, and FIGS. 4 and 5 respectively show a first key forming a first fitting part and a second fitting part according to an embodiment of the present invention. the second forming the part
FIG. 6 is a perspective view showing a key, and FIG. 6 is a perspective view showing a center support column according to another embodiment of the invention. 3... Center support column, 9... Center support column piece, 10... Divided surface, 12... First fitting part, 13... Second fitting part. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A plurality of center support column pieces each having a cylindrical shape and divided in the circumferential direction, a first fitting portion provided on a dividing surface of the center support column pieces and extending in the axial direction, and the above center support column piece. A central support column of a tokamak-type nuclear fusion device, which has a plurality of second fitting portions provided at predetermined intervals in the axial direction on a dividing surface of a column piece and extending in the radial direction. 2 A first recess extending in the axial direction and a plurality of second recesses extending in the radial direction that are provided at predetermined intervals in the axial direction are formed on each dividing surface of the center support column piece, and the first fitting part is , a first key having a hole provided at the same interval as the second recess in the axial direction is inserted into the first recess of the adjacent center support column piece in the axial direction, and a second fitting part The second key is inserted into the second recess of the adjacent center support column piece and the first inserted key.
The center support column of a tokamak-type nuclear fusion device according to claim 1, characterized in that the center support column is configured to be inserted into a hole of a key in a radial direction. 3 Each of the center support column pieces has a first recess extending in the axial direction on one dividing surface, a convex portion extending in the axial direction on the other dividing surface, and a second recess extending in the radial direction in the second fitting portion. The first fitting part is configured by fitting the first recess and the convex part of the adjacent center support column piece, and the second fitting part is configured by fitting the key to the adjacent center support column piece. The center support column of a tokamak-type nuclear fusion device according to claim 1, wherein the center support column is configured to be inserted into the second recess of the tokamak type nuclear fusion device.