JP3471897B2 - 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 having mechanical rigidity 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 fusion reactor, a superconducting toroidal magnetic field coil device for generating a toroidal magnetic field that circulates in a donut shape in a vacuum container in order to confine plasma in a donut shape vacuum container, and a toroidal A superconducting poloidal magnetic field coil device that generates a pulsed magnetic field in a direction orthogonal to the magnetic field is used. The superconducting toroidal magnetic field coil device is formed in a D shape surrounding the vacuum container, and a plurality of superconducting toroidal magnetic field coil devices are radially arranged in the circumferential direction of the magnetic field. Further, the superconducting toroidal magnetic field coil device (hereinafter abbreviated as superconducting coil device) to be used in the nuclear fusion experimental reactor has a D-shaped loop with a short diameter of about 8 m and an exciting current of several 1
It is expected to reach 0kA. Therefore, when an exciting current is passed through the superconducting coil, a strong electromagnetic mechanical force acts in the direction of expanding the D-shaped loop outward, and the electromagnetic repulsive force acting between the turns of the coil causes the coil to rotate. An electromagnetic mechanical force is generated in the direction in which the cross section expands. A superconducting coil, which is a spiral winding of a superconducting coil conductor, can not withstand the above electromagnetic mechanical force only with a superconducting coil in which a plurality of layers are bound with a ground-to-ground insulating coating. A superconducting coil that is housed in a coil container and has a spacer between the ground insulation coating 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. The device is known.

FIG. 6 is a sectional view showing a main part of a conventional superconducting coil device. In the figure, for the superconducting conductor 2, for example, a NbTi-based, Nb ₃ Sn-based, (Nb, Ti) ₃ Sn-based, or V ₃ Ga-based superconducting thin wire is placed in a stabilizing material such as copper having a helium flow groove. Forced cooling type superconducting conductor is used which is buried and stored in a conduit made of stainless alloy,
The surface of the conductor is coated with the conductor insulating coating 3. The superconducting conductor 2 configured as described above is wound into a D-shaped spiral to form a plurality of pancake coils 4A, 4B, 4C,
The superconducting coil 1 having the ground-to-ground insulating coating 5 is formed by stacking these to be electrically conductively connected to each other, stacking a varnished glass tape on the outer side thereof, and drying it. The coil container 7 is formed of a thick stainless alloy material so as to withstand electromagnetic mechanical force, the superconducting coil 1 is housed therein, and the gap between the ground-to-ground insulating coating 5 and the coil container 7 is filled with the spacing piece 6, A superconducting coil device is formed in which expansion of the coil cross section and expansion and deformation of the D-shaped loop due to electromagnetic mechanical force are prevented.

[0004]

In the prior art, in order to transmit the electromechanical force generated in the superconducting coil 1 to the coil container 7 having high rigidity and prevent the superconducting coil from being deformed by the electromechanical force, the spacing piece. It is desired that 6 completely fills the gap length G of the gap 9 between the ground insulating coating 5 of the superconducting coil 1 and the inner wall surface of the coil container 7 to firmly fix the superconducting coil 1 in the coil container. However, unless the thickness of the spacing piece 6 is smaller than the gap length G, it is difficult to insert the spacing piece into the gap 9 and the insulating coating 5 to ground is provided.
There is unevenness on the surface of the superconducting conductor that reflects misalignment between the superconducting conductors and uneven thickness of the taping layer, and the gap length G is reduced by the effect of this unevenness, and the thickness of the spacing piece that can be inserted into the gap. Becomes smaller, so that minute gaps remain on both sides of the spacing piece. Therefore, 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 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 equipped with deformation preventing means for the superconducting coil that can absorb fluctuations in the gap length and firmly fix the superconducting coil in the coil container.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a superconducting coil having a ground insulation coating is housed in a coil container made of a rigid non-magnetic metal. A filling container comprising a bag-shaped part made of a stainless alloy thin plate previously inserted in a gap between the ground insulation coating and the coil container and an injection pipe part penetrating the coil container and communicating with the bag-shaped part, In addition to being equipped with a means for preventing deformation of the superconducting coil, which is composed of a filler that has been pressure-injected and heat-cured in a filling container,
The peripheral portion of the bag-shaped portion is formed in a bellows shape.

Also, in a superconducting coil having a ground insulation coating housed in a coil container made of a rigid non-magnetic metal, stainless steel preliminarily inserted in a gap between the ground insulation coating and the coil container. Superconductivity consisting of a filling container comprising a bag-shaped part made of an alloy thin plate and an injection pipe part penetrating the coil container and communicating with the bag-shaped part, and a filler that has been pressure-injected and heat-cured in the filling container. A coil deformation preventing means is provided, and the filling container has a taper at a connecting portion between the bag-shaped portion and the injection pipe portion.
A brim-shaped reinforcing plate whose peripheral edge is thinned into a par shape is welded to the bag portion, and a brim-shaped reinforcing plate whose inner peripheral edge is welded to the injection pipe section.The pair of reinforcing plates are welded to each other. Shall be integrated.

[0008]

In the structure of the present invention, a bag-shaped part made of a stainless steel thin plate which is inserted in advance in the gap between the ground insulation coating of the superconducting coil and the coil container and an injection pipe which penetrates the coil container and communicates with the bag-shaped part. Filling container consisting of parts,
Since the filling container is provided with a means for preventing deformation of the superconducting coil, which is composed of a filler that has been pressure-injected and heat-cured, the bag-shaped portion of the filling container is formed in the step of storing the superconducting coil in the coil container. The work of storing the superconducting coil is facilitated by contracting in the thickness direction, and in the process of injecting the uncured filler under pressure, the bag-shaped part expands in the thickness direction and applies a pressing force to the ground-to-ground insulating coating, Since the stainless alloy thin plate deforms along the irregularities on the surface of the ground-to-ground insulating coating and fills the gap, by heating and hardening the uncured filler while applying pressure, the deformation prevention means solidifies and forms the gap. Therefore, the superconducting coil having the function of transmitting the electromagnetic mechanical force generated in the superconducting coil to the highly rigid coil container and preventing the superconducting coil from being deformed by the electromagnetic mechanical force will be maintained. It can be obtained Le device.

Further, in the above construction, since the peripheral portion of the bag-like portion is formed in a bellows shape, a filling container having a wide range of thickness adjustment can be obtained. The function of holding the filled state of the gap by interposing it in the non-uniform gap is obtained, and the concentration of mechanical stress applied to the welded part at the peripheral edge of the bag-shaped part due to the rise of the internal pressure is relieved by the bellows. The function to reduce the mechanical damage in and improve the reliability is obtained.

In the above structure, the filling container is
A flange-shaped reinforcing plate having a taper-shaped peripheral edge welded to the bag-shaped portion at the connecting portion between the bag-shaped portion and the injection pipe portion, and a collar-shaped reinforcement plate having an inner peripheral edge welded to the injection pipe portion. A plate and a pair of reinforcing plates are welded to each other to be integrated so that the joint is mechanically reinforced and a highly reliable filled container that can withstand the internal pressure when the filler is injected is obtained. And
The bag-shaped part made of a thin stainless alloy plate is used as a taper for the reinforcing plate.
Since the work of welding the peripheral edges that are thinned into a sheet shape is as easy as the work of welding the edges of two thin stainless alloy plates to each other, compared to the conventional welding method of directly welding the injection pipe to the stainless alloy thin plates. As a result, the residual stress of the welded portion is small, and the function of easily forming a highly reliable filled container can be obtained.

[0011]

The present invention will be described below with reference to reference examples. FIG. 1 is a cross-sectional view showing a main part of a superconducting coil device according to a reference example of the present invention, and the same components as those in the prior art are designated by the same reference numerals, and a duplicate description will be omitted. In the figure, a superconducting coil 1 having a ground insulating coating 5 and a coil container 7 made of a rigid non-magnetic metal
The deformation preventing means 11 for preventing deformation of the superconducting coil 1 by being inserted in the gap 9 between the superconducting coil 1 and the grounded insulating coating 5 and the coil container 7 is preliminarily inserted into the gap 9 and is made of a stainless alloy thin plate. Filling container 1 comprising a part 13 and an injection pipe part 14 penetrating the coil container 7 and communicating with the bag-shaped part 13.
2 and a filler 15 which is pressure-injected and heat-cured in this filling container. Examples of the filler 15 include 100 parts by weight of a bismaleimide / triazine resin (manufactured by Mitsubishi Gas Chemical Co., Inc., 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. A casting resin containing 600 parts by weight of powder (manufactured by Showa Denko KK, product number AS-40) is suitable.

In the reference example, a filling container 12 including a bag-shaped portion 13 made of a stainless thin plate and an injection pipe portion 14.
Has a flattened shape that is thinner than the gap length G when the filler 15 is not injected. The injection pipe portion 14 is passed through a through hole formed in a key part of the coil container 7, and the bag-shaped portion 13 is inserted into the coil container. By pressing against the inner wall surface of 7, the superconducting coil 1 can be easily stored in the coil container. The deformation preventing means 11 is divided into a plurality of parts so as to substantially cover the entire circumference of the D-shaped superconducting coil or the three surfaces except the inner peripheral surface. After the superconducting coils are housed, the inside of the filling container 12 is evacuated simultaneously. And then degassed liquid filler 20
Apply pressure by applying pressure of about kgf / cm ² .

In this process, the bag-shaped portion 13 expands in the thickness direction thereof and applies a pressing force to the ground-to-ground insulating coating 5, and the stainless alloy thin plate is deformed along the unevenness of the surface of the ground-to-ground insulating coating to form a gap. Since the filling is performed, by heating and curing the uncured filler in a pressurized state, the filler 15 in the bag-shaped portion 13 is solidified and has a rigidity.
1 is formed, and the filling state of the gap is maintained,
It is possible to obtain the superconducting coil device having a function of transmitting the electromagnetic mechanical force generated in the superconducting coil to the coil container having high rigidity and preventing the deformation of the superconducting coil 1 due to the electromagnetic mechanical force. In addition, the bismaleimide-triazine resin 10
By using a filler in which 0 parts by weight of liquid epoxy resin and 10 parts by weight of inorganic filler are mixed, the viscosity is adjusted by the epoxy resin to facilitate pressure injection work, and the inorganic filler is also used. The thermal expansion coefficient is suppressed by the compounding amount of and the thermal stress generated when cooled to an extremely low temperature can be reduced. Therefore, the mechanical stability is excellent and the excellent radiation resistance of the bismaleimide-triazine resin is utilized. A deformation preventing means can be obtained.

FIG. 2 is an enlarged cross-sectional view showing a main part of a superconducting coil device according to another reference example of the present invention, in which the deformation preventing means 21 is pre-filled in the filling container 12 and has a particle diameter of about 1 to 3 mm. The sand 26 is pressure-impregnated with a bismaleimide / triazine-based casting resin 27 containing an epoxy resin resin, and is heat-cured in a pressurized state to form the deformation preventing means 21 solidified by the filler 25. Is different from the above-mentioned reference example, the coefficient of thermal expansion is made closer to that of the metal material, and the filler is contracted when the superconducting coil device is cooled to a cryogenic temperature, and the deformation preventing function of the superconducting coil is more surely lowered. Can be prevented. As the casting resin 27, the filler 15 containing the inorganic filler in the above-mentioned reference example may be used.

FIG. 3 is a cross-sectional view showing the main part of a further different reference example of the present invention.
The peripheral edges of the stainless alloy thin plates 13A and 13B are welded to each other as a welded portion 16 to form a flat bag shape, and the injection pipe portion 14 is directly welded to one stainless alloy thin sheet 13A. Filling container 12 configured in this way
In, because a thin filling container can be easily manufactured,
There is an advantage that the gap between the superconducting coil and the coil container is inserted in a narrow gap to maintain the filled state of the gap and prevent deformation of the superconducting coil.

FIG. 4 is a sectional view showing an essential part of an embodiment of the present invention, which is different from the above-mentioned embodiments in that the peripheral portion 36 of the bag-shaped portion 33 is formed in a bellows shape. Part 36
Since a filled container with a wide range of thickness adjustment that expands and contracts freely according to the gap length can be obtained,
The filling state of the gap can be maintained by interposing the gap in the gap having a non-uniform gap length, and the bag-shaped peripheral portion 36 can be increased as the internal pressure increases.
Concentration of mechanical stress generated in the welded portions 36A, 36B, 36C, etc. is relieved, mechanical damage in this portion is avoided, and an advantage that a highly reliable filled container can be formed is obtained.

FIG. 5 is a cross-sectional view showing the main part of another embodiment of the present invention, in which the filling container 42 is connected to the joining portion between the bag-like portion 43 made of the stainless alloy thin plate and the injection pipe portion 14 and the tape. The inner peripheral edge 46, which is thinned into a par shape, is welded to the bag-like portion 43 by the welding portion 47.
The flange-shaped reinforcing plate 45 welded with the
It differs from the above-mentioned embodiment in that it is provided with a brim-shaped reinforcing plate 44 welded to each other, and the pair of reinforcing plates 44 and 45 are welded to each other at a welded portion 48 to be hermetically integrated. . In the filling container configured as described above, the joint portion is mechanically reinforced by the pair of reinforcing plates 44 and 45 having high rigidity to form the highly reliable filling container 42 that can withstand the internal pressure at the time of injecting the filling material, and the stainless steel can be formed. Inner peripheral edge 4 in which a bag-like portion 43 made of an alloy thin plate is thinned into a taper shape of a reinforcing plate 45.
Since the work of welding to No. 6 is as easy as the work of welding the edges of two thin stainless alloy plates to each other, compared to the conventional welding method of directly welding the injection pipe to the thin stainless alloy plates, The residual stress is small, and the advantage that a highly reliable filled container can be easily formed is obtained.

[0018]

As described above, according to the present invention, a liquid filler is pressure-injected into a filling container made of a stainless alloy thin plate which is previously inserted in the gap between the ground insulating coating of the superconducting coil and the coil container, This was heat-cured to form a means for preventing deformation of the solidified superconducting coil. 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, facilitating the work of storing the superconducting coil, and in the process of injecting the uncured filler under pressure. When the plate-shaped portion expands in the thickness direction and the stainless alloy thin plate is deformed along the irregularities on the surface of the ground-to-ground insulating coating to fill the gap, and the heat-hardening treatment is performed while the filler is pressurized, the deformation prevention means Will solidify and maintain the filling state of the gap, which is easier to work than the conventional technology, and the electromagnetic mechanical force generated in the superconducting coil can be better transmitted to the coil container with high rigidity. It is possible to provide a superconducting coil device provided with a deformation preventing means capable of preventing the coil from being deformed.

In addition to the above-mentioned structure, the peripheral portion of the bag-shaped portion is formed in a bellows shape so that the bag has a thickness corresponding to the gap length between the superconducting coil and the coil container, and has an internal pressure. It is possible to provide a highly reliable filling container that can endure.

In addition to the above structure, the bag-shaped portion and the injection pipe portion are welded to each other through a pair of reinforcing plates, so that a joint portion having high strength and mechanical reliability is provided. The advantage is that the filling container can be formed while maintaining quality stability due to the facilitated welding operation.

[Brief description of drawings]

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

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

FIG. 3 is a cross-sectional view showing a main part of still another reference example of the present invention.

FIG. 4 is a sectional view showing an essential part of an embodiment of the present invention.

FIG. 5 is a sectional view showing a main part of another embodiment of the present invention.

FIG. 6 is a sectional view showing a main part of a conventional superconducting coil device.

[Explanation of symbols]

1 Superconducting coil 2 Superconducting conductor 3 conductor insulation coating 4 pankey keys 5 Insulation coating to ground 6 interval pieces 7 coil container 9 gap 11 Deformation prevention means 12 filling containers 13 bag 13A stainless steel thin plate 13B stainless alloy thin plate 14 Injection tube 15 Filler 16 welds 21 Deformation prevention means 25 Filler 26 silica sand 27 Cast resin 33 bag 36 Bellows-shaped peripheral part 42 Filling container 43 bag 44 Reinforcement plate 45 Reinforcement plate 46 Tapered peripheral edge 47 Weld 48 welds G Gap length

Front page continued (72) Inventor Ikuo Ito 1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Fuji Electric Co., Ltd. Fuji Electric Co., Ltd. (72) Inventor Makoto Sugimoto 1st at 801, Mukaiyama, Naka-machi, Naka-gun, Naka-gun, Ibaraki Prefecture 1 In the Naka Research Institute at Japan Atomic Energy Research Institute (72) Hideo Nakajima, 1-801, Mukaiyama, Naka-machi, Naka-gun, Ibaraki Prefecture Japan Atomic Energy Research Institute Naka Institute (72) Inventor Kiyoshi Yoshida 801 No. 1 Mukaiyama, Naka-machi, Naka-gun, Naka-gun, Ibaraki Prefecture 1 of Japan Atomic Energy Research Institute Naka Research Institute (72) Hiroshi Tsuji 801 Mukai-yama, Naka-cho, Naka-gun, Ibaraki Prefecture No. 1 Naka Institute of Japan Atomic Energy Research Institute (56) Reference JP-A-6-36925 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 6/00 ZAA

Claims (2)

(57) [Claims] 1. A superconducting coil having a ground insulation coating,
What is housed in a coil container made of a non-magnetic metal having rigidity, the bag-shaped portion made of a stainless alloy thin plate previously inserted into the gap between the ground insulation coating and the coil container and the coil container The bag-shaped part is provided with a filling container formed of an injection pipe part communicating with the bag-shaped part, and means for preventing deformation of the superconducting coil, which is composed of a filler that is pressure-injected and heat-cured in the filling container. The superconducting coil device is characterized in that its peripheral portion is formed in a bellows shape. 2. A superconducting coil having a ground insulation coating,
What is housed in a coil container made of a non-magnetic metal having rigidity, the bag-shaped portion made of a stainless alloy thin plate previously inserted into the gap between the ground insulation coating and the coil container and the coil container The filling container includes a filling container formed of an injection pipe portion communicating with the bag-shaped portion, and the filling container is provided with deformation preventing means for the superconducting coil, which is composed of a filler that is pressure-injected and heat-cured. A brim-shaped reinforcing plate having a taper-shaped peripheral edge welded to the bag-shaped portion at the joint between the bag-shaped portion and the injection pipe portion,
A superconducting coil device, comprising: a brim-shaped reinforcing plate having an inner peripheral edge welded to an injection pipe portion, and the pair of reinforcing plates are welded to each other and integrated.