JP2925405B2 - Superconducting coil device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting coil device whose mechanical rigidity is enhanced by a coil container, and more particularly to a toroidal magnetic field coil device or a poloidal magnetic field coil device used for confining plasma in a fusion reactor.

[0002]

2. Description of the Related Art In a nuclear fusion reactor, a superconducting toroidal magnetic field coil device for generating a toroidal magnetic field circulating in a donut shape in a doughnut-shaped vacuum vessel in order to confine plasma in a donut-shaped vacuum vessel, A superconducting poloidal magnetic field coil device that generates a pulse magnetic field in a direction perpendicular to the magnetic field is used. The superconducting toroidal magnetic field coil device is formed in a D-shape surrounding the vacuum vessel, and a plurality of superconducting toroidal magnetic field devices are radially arranged along the circumferential direction of the magnetic field. Also, in a superconducting toroidal magnetic field coil device (hereinafter, abbreviated as a superconducting coil device) to be used in a nuclear fusion experimental reactor, a D-shaped loop has a short diameter of about 8 m and an exciting current of several tens of m.
It is expected to reach 0 kA. Therefore, when an exciting current is passed through the superconducting coil, a strong electromagnetic mechanical force acts in a direction to expand the D-shaped loop outward, and the electromagnetic repulsive force acting between the turns of the coil causes the coil to rotate. Electromagnetic mechanical force is generated in the direction in which the cross section expands. A superconducting coil formed by winding a superconducting coil conductor in a spiral shape and bundling a plurality of layers with an insulating coating between ground alone cannot withstand the above-mentioned electromagnetic mechanical force. A superconducting coil which is housed in a coil container having a coil and has a spacing piece interposed in a gap between the insulating coating between the ground and the coil container to prevent expansion of the coil cross section and expansion and deformation of the D-shaped loop due to electromagnetic mechanical force. Devices are known.

FIG. 3 is a sectional view showing a main part of a conventional superconducting coil device. In the figure, the superconducting conductor 2, for example NbTi based, Nb ₃ S _n system, (Nb, Ti) ₃ Sn-based, or V ₃ stable Kazai in such copper superconducting thin line Ga system, etc. having a helium flow channel A forced-cooling type superconducting conductor embedded in a conduit made of stainless steel or the like is used.
The surface is insulated and coated by the conductor coating insulating layer 3. The superconducting conductor 2 thus constructed is wound in a D-shaped spiral to form a plurality of puncture coils 4A, 4B, 4C, which are stacked and electrically conductively connected to each other, and the varnish-treated glass tape is provided on the outside thereof. The superconducting coil 1 having the ground-to-ground insulating coating 5 is formed by lapping and drying the loops. The coil container 7 is formed of a thick stainless alloy material so as to withstand the electromagnetic mechanical force. The superconducting coil 1 is housed in the coil container 7, and the gap between the ground insulating coating 5 and the coil container 7 is filled with the spacing piece 6. A superconducting coil device is formed which prevents expansion of the coil cross section and expansion and deformation of the D-shaped loop due to electromagnetic mechanical force.

[0004]

In the prior art, in order to transmit the electromagnetic mechanical force generated in the superconducting coil 1 to a coil housing 7 having high rigidity and to prevent the superconducting coil from being deformed by the electromagnetic mechanical force, a spacing member must be used. It is desired that 6 completely fills the gap length G of the gap 9 between the insulation coating 5 to the ground of the superconducting coil 1 and the inner wall surface of the coil container 7, and the superconducting coil 1 is firmly fixed in the coil container. However, if the thickness of the spacing piece 6 is not smaller than the gap length G, it is difficult to insert the spacing piece into the gap 9 and the insulation coating 6 between the ground and the ground.
The surface has irregularities reflecting the misalignment of the superconducting conductors and the unevenness of the thickness of the taping layer. The gap length G is reduced by the influence of the irregularities, and the thickness of the gap piece that can be inserted into the gap is reduced. Is further reduced, so that minute gaps remain on both sides of the spacing piece. Therefore, there is a problem that it is extremely difficult to transmit the electromagnetic mechanical force generated in the superconducting coil 1 to the coil container 7 having high rigidity and to prevent the superconducting coil 1 from being deformed by the electromagnetic mechanical force.

An object of the present invention is to provide a superconducting coil device provided with means for preventing deformation of a superconducting coil capable of absorbing variation in gap length and firmly fixing the superconducting coil in a coil container.

[0006]

According to the present invention, a superconducting coil having an insulation coating between grounds is housed in a coil container made of a rigid nonmagnetic metal. A filling container consisting of a bag-shaped portion made of a stainless alloy thin plate previously inserted in the gap between the ground insulation coating and the coil container, and an injection pipe portion penetrating through the coil container and communicating with the bag-shaped portion; A superconducting coil made of a filler which has been injected under pressure into a filling container and which has been subjected to heat curing treatment is provided with means for preventing deformation of the superconducting coil.

The filler is mainly composed of a bismaleimide / triazine resin, and a liquid epoxy resin is added to the filler.
It is made of a cured product of a casting resin containing 40% to 80% by weight of an inorganic filler in a volume fraction. Further, the filler is a mixture of silica sand having a particle diameter of about 1 to 3 mm previously filled in a filling container and a bismaleimide-triazine-based casting resin containing an epoxy resin vacuum impregnated into the filled silica sand. And heat-cured under pressure.

[0008]

In the construction of the present invention, a stainless-steel thin-sheet bag-shaped portion inserted in advance in a gap between the grounding insulating coating of the superconducting coil and the coil container, and an injection pipe penetrating through the coil container and communicating with the bag-shaped portion. The superconducting coil is made up of a filling container consisting of a part and a filler which has been injected into the filling container under pressure and heat-cured to prevent deformation of the superconducting coil. The bag-shaped part of the container shrinks in its thickness direction, facilitating the work of storing the superconducting coil, and the bag-shaped part expands in its thickness direction during the process of injecting the uncured filler under pressure, and the insulation coating between the ground and the ground Pressure, and the stainless steel sheet deforms along the irregularities on the surface of the insulation coating between the ground and fills the gaps. The deformation prevention means will be to retain the state of filling gaps solidified, to transmit the electromagnetic mechanical force generated in the superconducting coil to the high coil container rigid,
A superconducting coil device having a function of preventing deformation of the superconducting coil due to electromagnetic mechanical force can be obtained.

The filler is mainly composed of a bismaleimide / triazine resin, and a liquid epoxy resin is added to the filler.
If it is composed of a cured product of a casting resin containing 40% to 80% by weight of an inorganic filler in a volume fraction, the viscosity is adjusted by an epoxy resin, and the workability at the time of pressure injection is good, and the mixing of the inorganic filler is performed. Depending on the amount, the thermal expansion coefficient is suppressed, the dimensional change is small, and a deformation preventing means utilizing the excellent radiation resistance of the bismaleimide / triazine resin can be obtained.

Further, a filler is filled with silica sand having a particle size of about 1 to 3 mm previously filled in a filling container, and a bismaleimide-triazine casting resin containing an epoxy resin vacuum impregnated in the filled silica sand. If the heat-curing treatment is performed in a pressurized state, the coefficient of thermal expansion of the filler is made closer to that of the metal material, and when cooled to extremely low temperatures, the filler shrinks, and the function of preventing deformation of the superconducting coil is improved. The function of preventing the drop is obtained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. FIG. 1 is a cross-sectional view showing a main portion of a superconducting coil device according to an embodiment of the present invention. In the figure, a superconducting coil 1 having an insulation coating 5 to the ground and a coil container 7 made of a rigid non-magnetic metal
Of the superconducting coil 1 interposed in the gap 9 between the superconducting coil 1 and the bag-like portion 13 made of a stainless alloy thin plate previously inserted into the gap 9 between the insulating coating between the ground and the coil container. And a filling container 12 comprising an injection pipe portion 14 penetrating through the coil container 7 and communicating with the bag-shaped portion 13.
Filler 1 which has been pressure-injected into this container and cured by heating.
And 5. As the filler 15, for example, 100 parts by weight of a bismaleimide-triazine resin (manufactured by Mitsubishi Gas Chemical Company, product number BT3002), 10 parts by weight of an epoxy resin (manufactured by Nippon Ciba Geigy Co., product number GY260), and alumina as a filler are used. Powder (product number AS, manufactured by Showa Denko KK)
-40) A casting resin containing 600 parts by weight is suitable.

In the embodiment, the filling container 12 formed by welding the edges of two stainless steel sheets into a bag shape has a flat shape thinner than the gap length G when the filler 15 is not injected. The superconducting coil 1 can be easily housed in the coil container by passing the portion 14 through a through hole formed at a key point of the coil container 7 and pressing the bag-like portion 13 against the inner wall surface of the coil container 7. it can. The deformation preventing means 11 is divided into a plurality of parts so as to substantially cover the entire periphery of the D-shaped superconducting coil or three surfaces excluding the inner peripheral surface. After storing the superconducting coil, the inside of the filling container 12 is simultaneously evacuated. Then, the deaerated liquid filler is injected under pressure at a pressure of about 20 kgf / cm ² .

In this process, the bag-like portion 13 expands in the thickness direction to apply a pressing force to the ground-to-ground insulating coating 5, and the stainless steel sheet is deformed along the irregularities of the surface of the ground-to-ground insulating coating to form a gap. Since the filling is performed, the uncured filler is subjected to a heat-curing process in a pressurized state, so that the filler 15 in the bag-shaped portion 13 is solidified and has rigidity.
1 is formed, and the filling state of the gap is maintained,
A superconducting coil device having a function of transmitting the electromagnetic mechanical force generated in the superconducting coil to a highly rigid coil container and preventing the superconducting coil 1 from being deformed by the electromagnetic mechanical force can be obtained. In addition, by using a filler obtained by mixing 10 parts by weight of a liquid epoxy resin and 600 parts by weight of an inorganic filler with 100 parts by weight of a bismaleimide / triazine resin, the viscosity is adjusted by the epoxy resin and pressure injection work is performed. As well as being easy, the thermal expansion coefficient is suppressed by the compounding amount of the inorganic filler and the thermal stress generated when cooled to extremely low temperature can be reduced, so that the mechanical stability is excellent and bismaleimide
Deformation preventing means utilizing the excellent radiation resistance of the triazine resin can be obtained.

FIG. 2 is an enlarged sectional view showing a main part of a superconducting coil device according to a different embodiment of the present invention, in which a deformation preventing means 21 is used to fill a filling container 12 with a diameter of about 1 to 3 mm. A bismaleimide / triazine-based casting resin 27 containing an epoxy resin resin is impregnated with pressure in sand 26, and is subjected to heat-curing treatment in a pressurized state to form deformation preventing means 25 solidified by filler 25. However, unlike the above-described embodiment, the thermal expansion coefficient is made closer to that of the metal material, and when the superconducting coil device is cooled to extremely low temperature, the filler shrinks, and it is more reliable that the deformation preventing function of the superconducting coil is reduced. Can be prevented. As the casting resin 27, the filler 15 containing the inorganic filler in the above-described embodiment may be used.

[0015]

As described above, according to the present invention, a liquid filler is pressurized and injected into a stainless steel alloy sheet filling container previously inserted into a gap between the superconducting coil insulation layer and the coil container. This is configured to form a means for preventing deformation of the conductive coil which has been solidified by heat-curing. As a result, in the step of storing the superconducting coil in the coil container, the bag-shaped portion of the filling container shrinks in the thickness direction, thereby facilitating the operation of storing the superconducting coil. The stainless steel sheet is deformed along the unevenness of the surface of the insulation coating between the ground and the gap is filled, and the heat-hardening treatment is performed while the filler is pressurized. Solidifies to maintain the filling state of the gap, making it easier to work than conventional technology, and transmitting the electromagnetic mechanical force generated in the superconducting coil to a highly rigid coil container, It is possible to provide a superconducting coil device provided with a deformation preventing means capable of preventing deformation of the coil.

The filler is mainly composed of a bismaleimide / triazine resin, and a liquid epoxy resin is added to the filler.
If it is composed of a cured resin of a casting resin containing 40% to 80% by weight of an inorganic filler in a volume fraction, the coefficient of thermal expansion is suppressed by the amount of the inorganic filler, and the superconducting coil device is cooled to an extremely low temperature. A superconducting coil device having excellent mechanical stability and having deformation preventing means utilizing the excellent radiation resistance of a bismaleimide-triazine resin can be provided. .

Further, a filler is filled with silica sand having a particle diameter of about 1 to 3 mm previously filled in a filling container, and a bismaleimide / triazine-based casting resin containing an epoxy resin vacuum impregnated into the filled silica sand. If the heat-curing treatment is performed in a pressurized state, the coefficient of thermal expansion is made closer to that of the metal material, and when the superconducting coil device is cooled to extremely low temperature, the filler shrinks, thereby preventing the superconducting coil from deforming. It is possible to provide a superconducting coil device provided with a deformation preventing means that can more reliably prevent a decrease in the temperature.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a superconducting coil device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of a superconducting coil device according to another embodiment of the present invention.

FIG. 3 is a sectional view showing a main part of a conventional superconducting coil device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 superconducting coil 2 superconducting conductor 3 conductor insulating coating 4 puncture coil 5 insulation coating to ground 6 spacing piece 7 coil container 9 gap 11 deformation preventing means 12 filling container 13 bag-shaped part 14 injection pipe part 15 filler 21 deformation preventing means 25 Filler 26 Silica sand 27 Cast resin G Gap length

Continued on the front page (72) Inventor Ikuo Ito 1 Tanabe Nitta 1 Board, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Kiyoshi Sakaki 1 Tanabe Nitta 1 Board, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Makoto Sugimoto 1 at 801 Mukaiyama, Naka-cho, Naka-machi, Naka-gun, Ibaraki Pref. Inside the Japan Atomic Energy Research Institute Naka Research Institute (72) Inventor Kiyoshi Yoshida 1 at 801 Mukaiyama, Naka-machi, Naka-gun, Ibaraki Pref. (1) Fields of investigation (Int. Cl. ⁶ , DB name) H01F 6/00 ZAA H01F 5/00 H01F 6/06 ZAA

Claims (3)

(57) [Claims] 1. A superconducting coil having a ground-to-ground insulating coating,
In what is stored in a coil container made of a non-magnetic metal having rigidity, it penetrates through a bag-shaped portion made of a stainless alloy thin plate previously inserted in a gap between the ground insulating coating and the coil container and the coil container. A superconducting coil comprising: a filling container comprising an injection tube communicating with a bag-like portion; and a superconducting coil deformation preventing means comprising a filler which has been pressurized injected into the filling container and heat-cured. Coil device. 2. A cured product of a casting resin containing a bismaleimide / triazine resin as a main component, a liquid epoxy resin at 10% by weight, and an inorganic filler at a volume fraction of 40 to 80%. The superconducting coil device according to claim 1, wherein 3. A bismaleimide containing a silica sand having a particle size of about 1 to 3 mm previously filled in a filling container and an epoxy resin vacuum impregnated in the filled silica sand.
2. The superconducting coil device according to claim 1, wherein the superconducting coil device is made of a mixture with a triazine-based casting resin and is heat-cured in a pressurized state.