JPS6012597B2 - nuclear fusion device - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a nuclear fusion device, and more particularly to a nuclear fusion device in which a donut-shaped vacuum container containing plasma therein is supported on a base via support legs. Generally, a nuclear fusion device is placed in a donut-shaped vacuum container.
Toroidal coils are arranged radially to surround the vacuum vessel, and the plasma within the vacuum vessel is held by the magnetic field formed by the toroidal coils. The approximate gradual growth of a nuclear fusion device will be explained using FIGS. 1 and 2. In the figure, 1 is a doughnut-shaped vacuum container with a thick wall part la.
It is formed by combining bellows parts lb alternately in the torus direction, and stores plasma 2 therein. A plurality of toroidal coils 3 are arranged at predetermined intervals in the torus direction so as to surround the vacuum vessel 1, and generate a magnetic field for confining the plasma 2 within the vacuum vessel 1. Reference numeral 4 denotes a poloidal coil for stabilizing the plasma 2, which is arranged along the vacuum vessel 1 in a torus direction. Reference numerals 5 and 6 denote an upper base and a lower base that respectively support the vacuum container 1 and the toroidal coil 3 at the top and bottom. are supported by upper and lower bases 5 and 6, respectively.In addition, 9 is an iron core.In the nuclear fusion device configured in this way, in particular, the current flowing in the vacuum vessel 1 as a secondary circuit of the plasma 2, and the Electromagnetic forces such as the inward force FN of the torus due to interaction with various surrounding magnetic fields and the outward force FMo of the torus, or the inward force of the torus as a composite force of the force received from the atmosphere because the inside of the vacuum container 1 is a vacuum. A horizontal force acting as a vacuum force Fv is applied to the vacuum vessel 1, and a force that tends to expand due to the heat received from the plasma 2 or baking heat acts on the vacuum vessel 1. In order to support these loads, the vacuum vessel 1 is
As shown in FIG. 2, a lower support leg 8b and an upper support chest 8a are provided between the lower base 6 and the upper base 5, and are fixed to the bases 5 and 6, respectively, through these to support the various forces mentioned above. are doing. In recent years, nuclear fusion devices have made remarkable progress, and as a result, devices are becoming larger and larger. For this reason, problems unique to large-scale equipment are beginning to appear regarding the configuration of equipment, which did not pose many problems8. For example, the displacement and stress caused by various loads applied to the equipment structure increase as the equipment becomes larger. It has come to have a great influence on the overall function and structure. Against this background,
The fist movement of the vacuum container 1 when subjected to huge electromagnetic force, vacuum force, etc. will be explained with reference to FIGS. 3 to 5. In other words, Fig. 3 shows the case where the vacuum vessel 1 is in a normal position and the plasma 2 is lit almost at its center. This shows a case where the legs 8a and 8b are deformed and the vacuum vessel 1 (center ○) is displaced to the position 1' (center ○').Even in this case, the plasma 2 remains at the original position of the vacuum vessel 1 (center ○). (The explanation of the principle is omitted.) However, when the torus vacuum vessel 1 is displaced, the plasma 2 on the outer circumferential side of the torus and the moved vacuum vessel 1 are
′ come into contact with or interfere with the Ko part, causing extinction of the plasma 2 or shrinkage of the plasma 2, and the high-temperature plasma 2 directly interfering with the vacuum vessel 1. 'There is a risk that the wall will melt and cause vacuum breakdown, leading to serious trouble such as making it impossible to even form plasma 2. Figure 5 shows that the vacuum vessel 1 is 1'' due to the outward force Fo. A situation similar to that described in FIG. 4 occurs. In this way, how to suppress the displacement and stress of the vacuum container 1 in a large device, the deformation of the vacuum container support legs, and the stress,
In other words, an important issue is how to strengthen the vacuum container itself and the vacuum container support legs. The present invention has been made in view of the above points, and its purpose is to
To provide a nuclear fusion device that can sufficiently support forces applied in the horizontal direction even if the device is enlarged. The present invention provides a support member which is disposed along the torus direction of the vacuum container, is supported by the thick part of the vacuum container, and is formed into a substantially ring shape, and which supports the horizontal force acting on the vacuum container. This invention has been made to achieve the initial objective.The present invention will be described in detail below based on embodiments shown in the drawings.
Incidentally, the same reference numerals are used for the same parts as in the past. 6th
An embodiment of the present invention is shown in Figs. Its schematic structure is almost the same as that of the subordinate, so detailed explanation will be omitted here. In the nuclear fusion device of this embodiment shown in the figure, a cylindrical support ring (support member) 10 is arranged along the upper inner circumferential side of the vacuum container 1, and 11. Details of this are shown in Figures 8 and 9. Figure 8 is an enlarged view of part A in Figure 6, and Figure 9 is a plan view of the surrounding area. ``The protrusions 11 are attached to each thick wall part la forming the vacuum container 1.''
The support ring 10 is connected to the protrusion 11 via an insulating plate 12 that insulates electricity and heat using a connecting fitting 13 and an insulating bolt 14 for connecting. Then, using this support ring 0G, which is usually divided into a plurality of parts in the torus direction, connection flanges 5a and 15b are provided at the divided parts of the support ring 10 during assembly work, and the adjacent support rings 10 are
An insulating plate 16 for electrically insulating the torus direction is interposed between the connecting flanges 5a and 15b, and the connection is made using connecting insulating bolts 17 and nuts 18, and the final connection is completed up to the support ring 1. At this point, they are connected together to form a cylindrical shape and are fixed to the protrusion 11. In this way, in this embodiment, the support ring 1 is placed along the inner circumferential side of the vacuum container 1.
0 is installed, even if horizontal electromagnetic force FN and horizontal vacuum force Fv act inward to the torus of vacuum vessel 1, these are supported by the support ring! 0 can be sufficiently maintained. To explain this in more detail using FIG. 7, when the torus internal and outward electromagnetic forces FM, FM○ and vacuum force Fv act on the vacuum vessel 1, the reaction of the support legs 8a and 8b actually occurs. The force RB, RB2, RB3, RB4 and the support legs 8a, 8b are able to withstand it. That is, vacuum container 1
The electromagnetic force FN,? When the FMo is activated, the vacuum container 1 cannot withstand these forces and moves inward because bellows are formed between the thick parts. As a force supporting this, the reaction force Rs of the support ring 10 and the support leg 8
Reaction forces RB, RB2, RB3, and RB4 of a and 8b are generated. These force relationships can be expressed by the following equation.

[1
} Breaking stress (7i) generated in support legs 8a, 8b is i
KR81, RB2, RB3? RB4 is FV+FMI-
RS {2} Bending stress (ri) that occurs in the vacuum vessel 1 or the support legs 8a, 8b (FV1FM, 1R3) The amount of displacement (6i) of the container 1 is 8i = (Fv 1 F skin - Rs) , the stress generated in the vacuum vessel 1 and the support legs 8a, 8b, i,.The support ring 10 not only minimizes the stress i, but also minimizes the amount of displacement (6i) of the vacuum vessel 1.
It is easy to understand that the maximum effect can be obtained if the vacuum vessel is placed near the center of the overall force acting on the vacuum vessel. Of course, even if an outward electromagnetic force FNo (indicated by a dotted arrow in FIG. 7) acts, effective support is possible. By configuring as described above, the amount of displacement of the vacuum container 9 can be minimized, and the displacement of the vacuum container 1 and the support chest 8aj can be kept to a minimum.
Since the stress on the vacuum container 8b can be suppressed to a minimum of 4, the above-mentioned serious troubles can be prevented and the vacuum container blue and supporting legs 8a
, 8b can significantly improve safety. FIG. 10 shows another embodiment of the present invention. In the embodiment shown in the figure, a support ring 10 is provided on the outer periphery of the torus of the vacuum vessel 1. The other structures are exactly the same as those of the above embodiment, and the effects are also the same as those of the above embodiment. FIG. 11 shows another example of the support member. The support member shown in the figure fixes and connects a plurality of divided members IQa each having a rectangular cross section in the same manner as described above,
When the connection is complete, it forms a polygonal support member.
Even with such a support member, the effect is the same as that described above. According to the nuclear fusion device of the present invention described above, the fusion device is arranged along the torus direction of the vacuum vessel, is supported by the thick part of the vacuum vessel, and is formed into a substantially ring shape, Since it is equipped with a support member that supports directional force, the vacuum container can be held sufficiently by this support member even if electromagnetic force, vacuum force, etc. act in the horizontal direction, so there is no need to worry about strength. It is very effective when used in nuclear fusion devices.

[Brief explanation of the drawing]

Figure 1 is a partially sectional plan view of a conventional nuclear fusion device with the upper base omitted; Figure 2 is a cross-sectional view taken along line A-A; Figures 3, 4, and 5 are in vacuum. Fig. 3 shows the container in its normal position, Fig. 4 shows it inwardly displaced, Fig. 5 shows it outwardly displaced, and Fig. 6 shows the fusion device of the present invention. A plan view showing a partially sectional view of an embodiment of the seventh embodiment.
The figure is a sectional view taken along line 8-B, and Figure 8 is an enlarged view of part A in Figure 7.
FIG. 9 is a plan view of the area around FIG. 8, and FIG. 10 shows another embodiment of the nuclear fusion device of the present invention.
Figure 1 shows another example of the supporting part village and is a diagram corresponding to Figure 9.
lb...Bellows part, 2...Plasma, 3...
...Toroidal coil, 4...Poroidal coil,
5...Top base, 6...Bottom base, 8a,
8b...Support leg, 9... ... Iron core, 10...
...Support ring, stove 1...Vacuum container protrusion, 1
2, 16...Insulating plate, 13...Connection fittings 14...Insulating bolt for connection, 15a, 15b
...Connection flange, 17...Subsequent insulation bolt, 18...Nut. Younger brother I figure 2 Younger brother figure Kayamu figure Tsutomu figure Proud figure

Claims (1)

[Scope of Claims] 1. A donut-shaped vacuum container that stores plasma therein and is formed by alternately arranging thick-walled parts and bellows parts in the direction of the torus, and a torus-shaped vacuum container that surrounds the vacuum container and that is formed by alternately arranging thick-walled parts and bellows parts in the torus direction. A plurality of toroidal coils are arranged at predetermined intervals in the direction, and upper and lower parts support the toroidal coils from above and below.
In a nuclear fusion device comprising a lower base and support legs that support the vacuum vessel on the base, the support leg is arranged along the torus direction of the vacuum vessel and is supported by a thick part of the vacuum vessel. A nuclear fusion device characterized by comprising a support member formed into a substantially ring shape and supporting a horizontal force acting on a vacuum vessel. 2. The nuclear fusion device according to claim 1, wherein a protrusion is provided on the inner peripheral side of the thick wall portion of the vacuum container, and the supporting member is fixed to the protrusion via an insulator. 3. The nuclear fusion device according to claim 1, wherein a protrusion is provided on the outer peripheral side of the thick part of the vacuum container, and the support member is fixed to the protrusion via an insulator. 4. The support member is divided into a plurality of parts in the torus direction, and is arranged along the vacuum vessel, and is connected to adjacent support member division parts with an insulator interposed between them, so as to be substantially concentric with the vacuum vessel. The nuclear fusion device according to claim 1, 2, or 3, characterized in that it is integrally formed in a ring shape.