JPH03174706A - Superconductive coil device, nuclear fusion reactor including the same and energy storage apparatus - Google Patents

Abstract

PURPOSE:To improve dimensional accuracy and magnetic field performance by reducing the strain of a vessel by adopting a double structure of an inner coil vessel assembled by welding a thin member and an outer coil vessel assembled by mechanical coupling. CONSTITUTION:An inner coil vessel 2 is formed, in order to contain superconductive coil winding 1 and refrigerant, in a completely sealed structure by welding. Since the vessel 2 is thinly formed, even if it is assembled by welding, strain by welding is minimized. An outer coil vessel 3 is so formed of a thick metal plate member as to fixedly support the winding 1 durably against a generated electromagnetic force. The vessel 3 of the thick structure is assembled by mechanical coupling means, and no problem of strain by welding occurs. Thus, they can be mounted without strain due to welding to enhance dimensional accuracy and magnetic field performance.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a superconducting coil device, a nuclear fusion device, and an energy storage device including the same, and particularly to a superconducting coil device that is optimal for fixedly supporting a large superconducting coil winding. The present invention relates to a superconducting coil device that has a unique structure and can generate a highly accurate magnetic field, and to a nuclear fusion device and an energy storage device including the same.

[Conventional technology]

As a conventional example of superconducting coil device, Japanese Patent Publication No. 6050329
Examples include those disclosed in Japanese Patent Publication No. According to this prior art, as shown in FIG. 1, a superconducting coil winding is housed in a coil container, a wedge member is driven between the superconducting coil winding and the coil container, and the superconducting coil winding is placed in the coil container. Structures in which conductive coil windings are fixed have been disclosed in the prior art. The coil container has the function of accommodating the superconducting coil winding and a refrigerant to maintain the winding at a predetermined cryogenic temperature, and the function of storing the strong electromagnetic force generated when the superconducting coil winding is excited. In contrast, it has the function of fixedly supporting the superconducting coil winding. Therefore, although the coil container has a single container wall in the illustrated example, it is formed with a considerably thick wall in order to achieve the latter function.

As the size of the superconducting coil device progresses, the wall thickness of the container becomes more pronounced, and may be, for example, about 70 to 90 mm thick. According to the former function, the coil container is made completely sealed by welding in order to store a cryogenic refrigerant such as liquid helium inside the coil container.

[Problem to be solved by the invention]

In the coil winding fixing structure of the conventional superconducting coil device described above, no consideration is given to the distortion of the coil container caused by welding when manufacturing the coil container. In other words, when a superconducting coil device becomes larger and the coil container structure described above is adopted and the coil container is hermetically sealed by welding, the thickness of the container wall is considerably large, so it is difficult to assemble the coil container. During welding, the wall of the coil container is distorted, which deforms the superconducting coil winding housed and fixed inside the coil container, resulting in a problem that a predetermined designed magnetic field performance cannot be obtained.

The purpose of the present invention is to effectively solve the problems of the conventional superconducting coil device described above, and it is an object of the present invention to effectively solve the above-mentioned problems of the conventional superconducting coil device. The purpose of the present invention is to provide a superconducting coil device that has a structure in which the superconducting coil winding is attached and therefore exhibits high magnetic field performance.

Another object of the present invention is to provide a nuclear fusion device and an energy storage device equipped with a superconducting coil device having high magnetic field performance as described above.

[Means to accomplish the task]

A first superconducting coil device according to the present invention is a superconducting coil device comprising a coil winding formed by winding a superconducting conductor and a coil container containing a refrigerant for cooling the coil winding. A first coil container, in which the coil container is formed of a thin-walled member and assembled into a sealed structure using a welding connection means; and a second coil container, in which the coil container is formed of a thick-walled member and at least a main portion thereof is assembled by a mechanical connection means. It is configured to form from.

In the second superconducting coil device according to the present invention, in the first configuration, the first coil container accommodates the coil winding and the refrigerant, and the second coil container accommodates the first coil container. It is composed of

A third superconducting coil device according to the present invention is such that, in the first configuration, the second coil container accommodates the coil winding and the refrigerant, and the ↑th coil container accommodates the second coil container. It is composed of

A fourth superconducting coil device according to the present invention includes the first to third superconducting coil devices.
In any one of the above configurations, when the cross section of the first ↓ and second coil containers is polygonal, the radially inner wall member of the second ↓ and second coil containers is made common. .

The superconducting coil device according to the present invention is characterized in that the second coil container is assembled using both mechanical coupling means and welding coupling means.

The superconducting coil device according to the present invention is characterized in that the coolant is liquid helium or liquid nitrogen.

The superconducting coil device according to the present invention is characterized in that bolt fastening means or fitting coupling means are used as the mechanical coupling means of the second coil device.

The nuclear fusion device according to the present invention is configured to use the superconducting coil device having the above-mentioned configuration as either a toroidal coil device or a poloidal coil device.

The energy storage device according to the present invention is configured to use the superconducting coil device having the above configuration as a coil device.

[Effect]

In the superconducting coil device according to the present invention, the coil containers for accommodating the coil windings and the refrigerant are double-layered inside and outside, and the first coil container is formed of a thin-walled part and assembled by welding to form a completely sealed structure. The second coil container is formed of a thick-walled member,
At least the main parts are configured to be coupled and assembled using mechanical coupling means. Since the first coil container is formed with a thin wall, even if welding is used, the generation of distortion is small, and the distortion caused by assembly welding is reduced, so that the magnetic field performance of the superconducting coil is not reduced. Further, the second coil container supports the electromagnetic force generated by the superconducting coil and ensures sufficient rigidity.

Since the nuclear fusion device and energy storage device according to the present invention utilize the superconducting coil device according to the present invention, it is possible to maintain high magnetic field performance and improve the original overall performance of the nuclear fusion device and energy storage device. .

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a sectional view of essential parts of a superconducting coil device according to the present invention. The superconducting coil device according to the present invention is characterized in that the coil container that accommodates the superconducting coil winding has a dual structure inside and outside.

In FIG. 1, 1 is a ring-shaped superconducting coil winding, 2 is a ring-shaped inner coil container located inside, and 3 is a ring-shaped outer coil container located outside. As is well known, the superconducting coil winding 1 is constructed by arranging a large number of basic coil windings with gaps between them. A coolant such as liquid helium or liquid nitrogen flows between the gaps to cool the superconducting coil winding 1 to an extremely low temperature. This gap is usually called a cooling channel. An inner coil container 2 accommodating the superconducting coil winding 1 is formed of a thin metal plate. The inner coil container 2 accommodates the superconducting coil winding 1 and the refrigerant. Since the refrigerant must be contained, the inner coil container 2 is formed into a completely sealed structure using welding. Since the inner coil container 2 is formed to be as thin as possible, even when assembled by welding, distortion caused by welding is minimal. Further, the outer coil container 3 is formed of a thick metal plate member so as to be able to withstand the electromagnetic force generated by the superconducting coil winding and fixedly support the superconducting coil winding 1.

When the superconducting coil winding 1 is excited, an electromagnetic force of, for example, 1000 mm is applied per meter of length. In order to prevent the superconducting coil winding ↓ from being deformed by such electromagnetic force, the outer coil container 3 must function as a powerful support structure. In order to satisfy these conditions, the outer coil container 3 is formed with a thick wall structure.

Further, in assembling the outer coil container 3 having such a thick-walled structure, mechanical coupling means is used for all or the main parts. In addition, when mechanical coupling means are used for the main parts, it is possible to use welding for the outer coil container 3 and other parts within a range that does not cause any problem.

As described above, since welding is not used as the main assembly method for the outer coil container 3, the problem of distortion due to assembly and welding does not occur.

Note that the outside of the outer coil container 3 is configured with an adiabatic vacuum atmosphere in order to suppress the intrusion of external heat into the cryogenic refrigerant and the increase in the amount of evaporation due to the intrusion.

FIG. 2 shows a concrete assembly structure of the above embodiment in a sectional view. According to FIG. 2, a superconducting coil winding 1 is assembled, and an inner coil container 2 is attached to the outside thereof. The inner coil container 2 is assembled by welding, has a completely hermetic structure, and can seal the refrigerant. For an assembly 1 of a superconducting coil winding 1 and an inner coil container 2, which are formed into a ring shape as a whole, thick-walled inner cylindrical parts 3A and outer cylindrical members 3B are arranged inside and outside, respectively. Moreover, such an inner cylinder member 3A
Thick-walled side plate members 3C having a structure for fitting the inner cylinder member 3A and the outer cylinder member 3B are arranged on both sides (double position in the figure), and are connected at a plurality of predetermined locations with bolts 4 to connect the inner cylinder member 3A and the outer cylinder member 3B. The cylinder member 3B and the side plate assembly 3C are integrated.

In the above embodiment, bolts are used as mechanical coupling means for assembling the outer coil container 3, but it is also possible to construct the assembly by simply fitting and coupling.

FIG. 3 shows another embodiment of the invention. In this example,
In the embodiment described above, the structure is such that the inner wall portion in the radial direction of the outer coil container 3 is omitted. In other words, the electromagnetic force load during excitation in a superconducting coil device acts strongly outward in the radial direction, and does not act as strongly inward, so The superconducting coil device according to this embodiment has only the inner coil container 2 and has a -layered structure.The other structure is the same as the structure shown in Fig. 1.The superconducting coil device according to this embodiment also has a large structure compared to the conventional device. As a result, the amount of welding required for assembly has been significantly reduced, and the device functions as a high-performance superconducting coil device with little welding distortion.

FIG. 4 shows a specific example of the configuration of the other embodiment. Only the above-mentioned inner cylinder part +4' 3 A is no longer necessary, and the other configurations are the same as the configuration shown in FIG. 2.

In each of the above embodiments, the inner coil container is thin and formed using welding, and the outer coil container is thick and formed using mechanical coupling means, but it is also possible to reverse the structure of the inner and outer coil containers. It is. In this case, the structure is such that an outer thin-walled coil container having a welded joint structure accommodates a thick-walled inner coil container.

Application examples of the superconducting coil device according to the present invention are shown in FIGS. 5 and 6. FIG. 5 is a partially sectional plan view of the nuclear fusion device, and FIG. 6 is a sectional view taken along the line VI-VI in FIG. In this nuclear fusion device, a plurality of toroidal coils 12 and a plurality of poloidal coils 3 are provided to confine plasma 11 in a predetermined space. A superconducting coil device having the structure shown in the above embodiment can be used for these toroidal coils 12 and poloidal coils 13.

By using the superconducting coil device of the above embodiment, it is possible to improve the accuracy of the magnetic field that confines the plasma ↑1 and realize a high-performance nuclear fusion device.

In addition, in FIG. 5, only the cross section of one toroidal coil shows the double inner and outer coil container structure, and the other cross sections are shown in normal cross-sectional representation, and detailed illustrations are omitted.

The superconducting coil device according to the present invention can also be used as a coil device for an energy storage device.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the following effects occur.

A coil container accommodating a superconducting coil winding is divided into two parts: a first coil container made of a thin-walled member and assembled by welding, and a second coil container made of a thick-walled member and assembled by mechanical coupling means. Due to the heavy structure, the amount of assembly welding is reduced and welding distortion can be reduced, and the deformation of the superconducting coil device due to welding distortion is reduced, resulting in higher dimensional accuracy of the entire device and higher magnetic field performance. I can do it.

Since the fusion device and the energy storage device are fabricated using the superconducting coil device according to the present invention having high magnetic field performance, the fusion device and the energy storage device can exhibit high performance with respect to their original functions.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a superconducting coil device according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a specific assembly structure of the superconducting coil device according to the first embodiment, and FIG. 4 is a diagram similar to FIG. 1 showing another embodiment of the present invention, FIG. 4 is a diagram similar to FIG. 2 showing a specific assembly structure of the superconducting coil device of the above embodiment, and FIG. 6 is a cross-sectional plan view taken along the line VI-VI in FIG. 5. FIG. [Explanation of symbols] 1... 2... 3... 4... 12... 13... ・Superconducting coil winding・Inner coil container・Outer coil container・Bolt・Toroidal coil/poloidal coil

Claims (11)

[Claims] (1) In a superconducting coil device comprising a coil container containing a coil winding formed by winding a superconducting conductor and a refrigerant for cooling the coil winding, the coil container is formed of a thin-walled member, and A superconductor characterized in that it is formed from a first coil container that is assembled into a sealed structure by welding coupling means, and a second coil container that is formed of a thick-walled member and at least a main part is assembled by mechanical coupling means. coil device. (2) In the superconducting coil device according to claim 1, the first coil container accommodates the coil winding and the refrigerant, and the second coil container accommodates the first coil container. Characteristic superconducting coil device. (3) In the superconducting coil device according to claim 1, the second coil container accommodates the coil winding and the refrigerant, and the first coil container accommodates the second coil container. Characteristic superconducting coil device. (4) In the superconducting coil device according to any one of claims 1 to 3, when the first and second coil containers have polygonal cross sections, the first and second coil containers have polygonal cross sections. A superconducting coil device characterized by having a common radially inner wall member. (5) The superconducting coil device according to claim 1, wherein the second coil container is assembled using a combination of mechanical coupling means and welding coupling means. (6) The superconducting coil device according to claim 1, wherein the coolant is liquid helium. (7) The superconducting coil device according to claim 1, wherein the coolant is liquid nitrogen. (8) The superconducting coil device according to claim 1, wherein bolt fastening means is used as the mechanical coupling means of the second coil device. (9) The superconducting coil device according to claim 1, wherein a fitting coupling means is used as the mechanical coupling means of the second coil device. (10) A nuclear fusion device, characterized in that the superconducting coil device according to any one of claims 1 to 9 is used in at least one of a toroidal coil device and a poloidal coil device. (11) An energy storage device comprising a coil device, characterized in that the superconducting coil device according to any one of claims 1 to 9 is used in the coil device.