JPH02231702A - Supporting apparatus for magnetic field coil - Google Patents

Abstract

PURPOSE:To decrease reinforcement for a supporting structure by providing a constitution wherein a magnetic field coil can be moved in the radial direction under the state wherein the magnetic field coil is contained in the supporting structure, and bringing the upper and lower surfaces of the magnetic field coil into contact with the inner surface of the supporting structure. CONSTITUTION:A magnetic field coil 1 whose cross section in the axial direction is rectangular and a supporting structure 2 whose cross section in the axial direction is rectangular are provided. Gaps g1 and g2 are formed between the inner surface of the supporting structure 2 and the upper surface, the lower surface and the inner and outer surfaces of the magnetic field coil 2. An upper low-friction plate 3a and a lower low-friction plate 36 comprising a low-friction material whose surface is very smooth are contained in the gap g1. The upper low-friction plate 3a and the lower low-friction plate 3b are arranged between the upper surface of the magnetic field coil 1 and the inner surface of the supporting structure and between the lower surface of the magnetic field coil 1 and the inner surface of the supporting structure 2 in the surface contact state. Therefore, the electromagnetic force in the vertical direction generated in the magnetic field coil and the dead weight can be securely supported. Even if the displacing force in the radial direction is generated, reaction to the supporting structure can be reduced. Thus, reinforcement to the supporting structure can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a support device for housing and supporting a magnetic field coil for the purpose of generating a strong magnetic field, such as a poloidal magnetic field coil of a nuclear fusion device.

(Prior technology) Conventionally, there is a voloidal magnetic field coil for nuclear fusion devices as a magnetic field coil for the purpose of generating a strong magnetic field, but this has a torus shape and is configured as a magnetic field coil in order to flow a large current. A vertical electromagnetic force FZ and a radial electromagnetic force FR act on the conductor itself.

Further, when the magnetic field coil is energized, heat (Joule heat) is generated due to the electrical resistance of the conductor itself, and as a result, the conductor itself thermally expands, so that a thermal stress F}l acts in the radial direction.

For this reason, as an example of a conventional magnetic field coil support device, in order to support the vertical electromagnetic force FZ of the magnetic field coil and the self-weight of the magnetic field coil, the magnetic field coil and the support structure that houses and supports the magnetic field coil are moved horizontally. There is a device that is mechanically restrained, but this is due to the radial electromagnetic force Fl? Also, no consideration is given to countermeasures against radial displacement force due to thermal stress FI1.

(Problem to be Solved by the Invention) Therefore, when a large current is passed through the magnetic field coil, electromagnetic force FR in the radial direction and thermal stress FH in the radial direction act as described above, and these radial displacement forces support This acts on the support structure as a reaction force of the structure, resulting in a toppling force that causes the support structure to fall. In order to prevent this overturning force, it is sufficient to provide a reinforcing material to reinforce the supporting structure, but in this case, not only is a strong reinforcing material capable of resisting the above-mentioned overturning force required, but also There was a problem in that a large space was required to install the reinforcing material.

The present invention can reliably support the vertical electromagnetic force generated in the magnetic field coil and its own weight, and even if a radial displacement force occurs, the reaction force against the support structure can be significantly reduced, and the reinforcement of the support structure can be significantly reduced. It is an object of the present invention to provide a supporting device for a magnetic field coil that can be used.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a support device for housing a toroidal magnetic field coil in a support structure and supporting it at a fixed site. A low friction member having a small surface friction coefficient in a gap existing between the support structure and the magnetic field coil is arranged and fixed on the lower surface and the upper surface of the outer peripheral surface of the magnetic field coil, and the low friction member is brought into surface contact with the inner circumferential surface of the support structure.

(Function) According to the present invention, the magnetic field coil is configured to be movable in the radial direction with the magnetic field coil housed in the support structure, and the upper and lower surfaces of the magnetic field coil are in plane with the inner peripheral surface of the support structure. Because they are in contact with each other, the vertical electromagnetic force generated in the magnetic field coil and its own weight can be supported, and if a radial displacement force is generated between the support structure and the magnetic field coil, the magnetic field coil will not move inside the support structure. Due to the radial movement of the support structure, the radial frictional force generated between the support structure and the magnetic field coil can be reduced, and therefore the reaction force or overturning force on the support structure can be significantly reduced, and thus the support structure Reinforcement is required to a minimum. In addition, with the above configuration, when a radial displacement force is generated on the magnetic field coil, the movement of the magnetic field coil is performed smoothly, which almost eliminates the problem of overturning force of the support structure, and the installation of reinforcing material Even if it is required, the installation space is extremely small.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the present invention, and FIG. 2 is a side cross-sectional view showing one embodiment of the present invention. A toroidal magnetic field coil 1 having a rectangular axial cross section, and a support structure 2 housing and supporting the magnetic field coil 1 having a rectangular axial cross section,
Gaps g1 and g2 between the inner circumferential surface of this support structure 2 and the upper and lower surfaces and inner and outer circumferential surfaces of the magnetic field coil 1, respectively.
are formed, and one of the gaps gl is configured as follows. That is, an upper low-friction plate 3a and a lower low-friction plate 3b made of extremely smooth surfaces, such as fluoride resin, are housed in the gap GL, and the upper surface of the magnetic field coil 1 and the inner surface of the support structure 2 are connected to each other. and between the lower surface of the magnetic field coil 1 and the inner surface of the support structure 2, the upper low friction plate 3a and the lower low friction plate 3b, respectively.
are arranged so that they are in surface contact. Thus, cutout grooves 3al and 3bl are formed on the upper surface of the low friction plate 3a and the lower surface of the low friction plate 3b, respectively, through which the plate fixing band 4 such as a glass lobe can pass. is provided with a plate fixing band 4, and the low friction plates 3a, 3b are firmly tied and fixed to the magnetic field coil 1.

Therefore, the low friction plates 3a and 3b are attached to the support structure 2.
A cutting process has been applied to create a horizontal surface so that no slip resistance occurs between the two.

Furthermore, the inner surface of the support structure 2 and the low friction plate 3a,
The contact surface with 3b is polished, and this polished surface 5 is coated with a lubricant such as boron nitride or molybdenum disulfide.

In this way, the low-friction plates 3a and 3b are arranged and fixed in surface contact in the gap gl between the inner peripheral surface of the support structure 2 and the upper and lower surfaces of the magnetic field coil 1, so that the vertical It can support the electromagnetic force in the direction and its own weight. In this state, by passing a large current through the magnetic field coil 1, an electromagnetic force FR is generated in the radial direction of the magnetic field coil 1, and a radial thermal stress FH is generated due to thermal expansion due to heat generation due to conductor resistance when the magnetic field coil 1 is energized. If this occurs, the magnetic field coil 1 and
A low friction plate 3a fixed to this magnetic field coil 1 by a plate fixing band 4. 3b both move in the radial direction within the range of the gap g2 formed on the inner and outer peripheral surfaces of the magnetic field coil 1. This is the outer peripheral surface of the magnetic field coil 1 in the gap gl existing between the support structure 2 and the magnetic field coil 1, and low friction plates 3a and 3b are arranged and fixed on the upper and lower surfaces, respectively. This is because the inner circumferential surface of the support structure 2 that contacts 3a and 3b is polished, and this processed surface 5 is coated with a lubricant such as boron nitride. In this case, the amount of movement of the magnetic field coil 1 etc. is determined by the magnitude of the displacement force in the radial direction.

For this reason, the friction coefficient of the contact surface on the support structure 2 side can be reduced, and as a result, the reaction force against the support structure 2, which is caused by the conventional radial displacement force, can be significantly reduced, and the reaction force against the support structure 2 can be reduced. There are fewer problems with the overturning force exerted on the vehicle, and depending on the application, there is no need to provide any reinforcing material to take measures against the overturning force, and even if the reinforcing material is required to be installed, the installation space can be extremely small.

Note that the present invention is not limited to the embodiments described above, and the lower and upper surfaces of the inner circumferential surface of the support structure 2 may not be polished, but low-friction members may be provided on both surfaces.

[Effects of the Invention] According to the present invention described above, the vertical electromagnetic force generated in the magnetic field coil and its own weight can be reliably supported, and even if a radial displacement force occurs, the reaction force against the support structure can be significantly reduced. Therefore, it is possible to provide a magnetic field coil support device that can significantly reduce the reinforcement of the support structure.

[Brief explanation of the drawing]

1 and 2 are a longitudinal sectional view and a side sectional view, respectively, showing an embodiment of the present invention. 1... Magnetic field coil, 2... Support structure, 3a, 3b
...Low friction plate, 4...Plate fixing band, 5.
...Polished surface. jIIl Medicine

Claims (1)

[Scope of Claim] A support device for housing a toroidal magnetic field coil by a support structure and supporting it at a fixed site, comprising: a surface friction coefficient in a gap existing between the support structure and the magnetic field coil; A low-friction member having a small radius is arranged and fixed on the lower and upper surfaces of the outer circumferential surface of the magnetic field coil, respectively, and the low-friction member is brought into surface contact with the inner circumferential surface of the support structure so that the magnetic field coil has a radius 1. A support device for a magnetic field coil, characterized in that the device is configured to be movable in a direction.