JPS6119089B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting device, and more particularly to a superconducting device in which the mounting of a spacer constituting a flow path for cooling windings is improved.

In recent years, devices that utilize superconductivity phenomena are being adopted in a wide range of applications such as magnetic levitation, energy storage, rotating electric machines, and nuclear fusion devices.

In particular, nuclear fusion devices have become significantly larger, and the coils used in them must generate strong magnetic fields to confine high-temperature plasma. Conventional normal conducting coils have limitations in terms of the magnetic field that can be generated.
Large superconducting coils are essential for nuclear fusion devices that need to generate even stronger magnetic fields.

Generally, in order to create a superconducting state, a coil must be cooled to an extremely low temperature with a coolant such as liquid helium or supercritical helium. For this reason, superconducting coils are usually housed in a vacuum-insulated container.

An example of a superconducting coil is shown in FIGS. 1 to 3. That is, a plurality of superconducting coils 2 wound in a pancake shape, a helium container 1 housing them, and a spacer 3 located between adjacent superconducting coils.
and a fixing member located between the superconducting coil 2 and the helium container 1. The spacer 3
The fixing member 4 constitutes a flow path for a coolant such as liquid helium to efficiently cool the superconducting coil 2, and also provides electrical insulation between adjacent superconducting coils. It provides fixation and electrical insulation.

Conventional spacers 3 are arranged between adjacent superconducting coils as shown in FIG. 3, and are bonded with insulating varnish or the like. Furthermore, as shown in FIGS. 4 and 5, insulating rings 5 are assembled and bonded to the inner and outer circumferences of each superconducting coil 2. No insulating ring is disposed on the inner and outer peripheries located between the superconducting coils 2 to form a circumferential coolant passage. The spacer 3 of the superconducting coil by such adhesion is sufficient for relatively small superconducting coils, as long as the forces acting on the coil and spacer, such as the electromagnetic force that may be generated, are relatively small and within the allowable range of manufacturing tolerances. Ta. However, in large superconducting coils that generate strong electromagnetic force such as in fusion devices, adhesion alone is not reliable when considering the force acting on the spacer, thermal contraction/expansion, etc.; There is a drawback that the distribution of refrigerant is restricted.

The present invention has been made in view of the above points, and its purpose is to prevent the insulating spacer from easily collapsing due to electromagnetic force, thermal deformation, etc. even when the device becomes larger, and to prevent the flow of refrigerant from being restricted. The purpose of the present invention is to provide a superconducting coil that is free of

The present invention provides a cryogenic container containing a cryogenic liquid;
A fitting that fits into an insulating spacer arranged between the superconducting coils is provided between the plurality of superconducting coils immersed in a cryogenic liquid and stored in the cryogenic container, and this fitting The intended purpose is achieved by supporting the insulating spacer with the support.

An embodiment of the present invention will be described with reference to the drawings.
FIGS. 6 and 7 show a spacer mount 6 according to the present invention.
FIG. 3 is an explanatory diagram showing the insulating spacer 3 attached by the method. That is, helium container 1 and superconducting coil 2
A concave spacer fitting 6 is attached to the inner and outer fixed portions of the insulating spacer 3 in the refrigerant passages formed on the inner and outer peripheries between the two. The spacer 3 is longer than the coil width and is fitted into the recess of the spacer fixture 6. On the other hand, the superconducting coil 2 is inserted between the spacer fittings 6 in the radial direction, and the gap between the superconducting coil 2 and the spacer fitting 6 is filled with an insulating liner or the like (not shown).
Adjust and fix. In this embodiment with such a configuration, the insulating spacer is attached by a mechanical connection that is fitted into the spacer fixture, which prevents the insulating spacer from falling off due to separation from the coil at extremely low temperatures, and prevents the cooling process.
The difference in thermal expansion between the spacer and the coil/container during the temperature rising process can be absorbed by the fixture gap. Therefore, blockage of the refrigerant passage and increase in stress due to falling off can be prevented, and the large superconducting coil can be operated safely and with high reliability.

According to the superconducting device of the present invention described above, between the cryogenic container containing the cryogenic liquid and the plurality of superconducting coils immersed in the cryogenic liquid and housed in the cryogenic container, A fitting that fits into the insulating spacer placed between the superconducting coils is provided, and the insulating spacer is supported by this fitting, so even if the device becomes larger, the insulating spacer can be
It is very effective for this type of superconducting device because it does not easily collapse due to electromagnetic force, thermal deformation, etc., and therefore does not cause any restriction in the flow of the coolant.

[Brief explanation of the drawing]

Fig. 1 is an external side view of the superconducting coil, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, Fig. 3 is a spacer arrangement diagram of the superconducting coil, and Fig. 4 is a vertical cross-section showing the installation state of conventional spacers. 5 is a partially sectional plan view, FIG. 6 is a vertical sectional view showing the mounting state of the spacer in an embodiment of the present invention, and FIG. 7 is a partially sectional plan view. FIG. 1... Helium container, 2... Superconducting coil, 3
...Insulating spacer, 5...Insulating ring, 6...Spacer mounting tool.

Claims (1)

[Claims] 1. A cryogenic container containing a cryogenic liquid, a plurality of superconducting coils immersed in the cryogenic liquid and stored in the cryogenic container, and an insulating spacer disposed between the superconducting coils. In the superconducting device, between the cryogenic container and the superconducting coil,
A superconducting device characterized in that a fixture is provided that fits into the insulating spacer, and the insulating spacer is supported by the fixture.