JPS6346964B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a superconducting electromagnet device.

In general, a superconducting electromagnet device uses a superconducting coil formed by winding a superconducting wire into a coil shape, whose electrical resistance becomes zero when the temperature drops below a critical temperature, in an insulated container and using a cryogenic coolant such as liquid helium. It is constructed by cooling the temperature below the critical temperature.

For example, superconducting electromagnet devices shown in FIGS. 1 and 2 have been considered as on-board superconducting electromagnet devices for magnetic levitation trains. In FIG. 1 and FIG. 2, 1 is a superconducting coil 2 is the superconducting coil 1.
The inner container 3, which houses the superconducting coil 1 and is filled with a cryogenic refrigerant, is a fixing jig that supports and fixes the superconducting coil 1 to the inner container 2, and is arranged at predetermined intervals. Also, 4
5 is an insulating plate that electrically insulates the superconducting coil 1, and 5 is a flow port for a cryogenic refrigerant. The superconducting coil 1 configured in this manner is housed in a heat insulating container (not shown), and the inner container 2 is filled with a cryogenic refrigerant to cool it below the critical temperature. Note that FIG. 1 shows a plan view of a conventional device, and FIG. 2 shows a sectional view of the conventional device.

However, the conventional device configured in this manner has the following drawbacks. That is, since the superconducting coil 1 and the insulating plate 4 are not integrated, when trying to obtain the desired electromagnetic characteristics by supplying current to the superconducting coil 1, the superconducting coil 1 will be affected by the electromagnetic force generated by itself. Trying to transform.
At this time, friction occurs between the surface of the superconducting coil 1 and the insulating plate 4, and the frictional heat generated during this friction penetrates into the superconducting coil 1 and increases the temperature of the superconducting coil 1, and this temperature rise exceeds the critical temperature. This destroys the superconducting properties of the superconducting coil 1, making it impossible to obtain the desired electromagnetic properties, or in order to obtain the desired properties, training is required to conduct numerous energization tests, which requires a great deal of time and effort. Was. Furthermore, when the superconducting properties of the superconducting coil 1 are destroyed, the energy stored in the superconducting coil 1 causes the evaporation of a cryogenic refrigerant, such as liquid helium, but the consumption of this cryogenic refrigerant is also enormous. It was hot. That is, superconducting coil 1
The problem was instability due to the penetration of frictional heat on the surface.

SUMMARY OF THE INVENTION An object of the present invention is to provide a superconducting electromagnet device that solves the above-mentioned drawback of instability caused by penetration of frictional heat from the surface of a superconducting coil.

In the present invention, after winding a superconducting wire into a coil shape,
Metal pipes are arranged parallel to the winding direction on a part of the surface at predetermined intervals, and then the superconducting coil impregnated with synthetic resin and integrated is placed in a tube-shaped inner container. By housing the superconducting coil in such a way that it is supported and fixed through the coil, frictional heat is generated on the integrated surface of the inner container and metal pipe, which is far from the coil surface, and the generated frictional heat is transferred to the superconducting coil. Stability is improved by radiating heat from the intrusion to the cryogenic refrigerant flowing through the metal pipe.

Hereinafter, representative embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 shows an embodiment of the invention. A superconducting coil 6 made of superconducting wire wound into a coil is placed in an inner container 1.
A device equivalent to the conventional fixing jig 3 for fixing at 0 is woven with an electrically insulated wire having a low thermal conductivity, with the opening of the metal pipe 7 having a high thermal conductivity facing the winding direction of the superconducting coil 6. The ivy insulating cloth 8 is placed inside the laminated structure, and then the entire structure is impregnated with the superconducting coil 6 and synthetic resin 9 to form a support member 12 integrated with the superconducting coil 6. This support member 12
The superconducting coils 6 are arranged at predetermined intervals so as to correspond to the fixing jig 3 in FIG. It is housed in a fixed manner and housed in a heat insulating container 10 (not shown). Specifically, this supporting and fixing is carried out by, for example, making the inner container 10 U-shaped, storing the superconducting coil 6 integrated with the supporting member 12 in the inner container 10, and inserting the superconducting coil 6 into the opening of the U-shaped inner container 10. Align the lid member that covers the opening. By forming the support member integrated with the superconducting coil 6 to be slightly larger than the inner diameter of the inner container, a pressing force is exerted on the lid member against the support member 2.

The inner container 10 is formed by welding while maintaining this pressing force. Therefore, the superconducting coil 6 is supported and fixed by the pressing force from the inner container 10 via the support member 12. Note that the inside of the metal pipe 1 is designed so that the cryogenic refrigerant can easily circulate therein.

The superconducting coil 6 is formed by embedding a large number of superconducting core wires in a low-resistance metal such as copper, and insulating the surface with a formal coating or the like, and winding the superconducting wire into a coil shape.

The insulating cloth 8 is made of electrically insulated wire woven so that the synthetic resin 9 can penetrate therethrough, and the electrically insulated wire is made of, for example, glass fiber.

The synthetic resin 9 is a material having moldability and electrical insulation properties, such as epoxy resin or varnish, and is impregnated into the insulation cloth 8 and further impregnated into the metal pipe 7 to connect the superconducting coil 6 and the metal pipe 7. It is something that unifies.

On the other hand, as the metal pipe 7, for example,
A pipe made of metal such as copper, aluminum, or stainless steel, and its cross-sectional shape is circular, square, oval, etc., and is arranged at a predetermined interval on a part of the surface of the superconducting coil 6 with an insulating cross 7. After that, it is impregnated with a synthetic resin 9 and integrated with the superconducting coil 6, and the superconducting coil 6 is supported and fixed to the inner container 10.

The inner container 10 may have a cross-sectional shape such as a square, circle, or ellipse, and is formed into a tube shape along the winding direction of the superconducting coil 6.
It houses the superconducting coil 6 and is filled with a cryogenic coolant, typically liquid helium.

Therefore, in the superconducting electromagnet device having the above structure, the superconducting coil 6 is connected to the inner container 10 via the support member 12.
Since the superconducting coil 6 is supported and fixed only by pressing force, when trying to obtain the desired electromagnetic characteristics by energizing the superconducting coil 6, the generation of frictional heat due to the deformation of the superconducting coil 6 due to the electromagnetic force of the superconducting coil 6 It is designed to occur between the surface of the support member 12 remote from the surface of the inner container 10 and the inner container 10. Furthermore, in order to prevent the frictional heat generated here from being transmitted to the superconducting coil 6, by configuring the support member 12 by arranging the metal pipe 7 inside the laminated insulating cloth 8, the frictional heat generated here is prevented from being transmitted to the superconducting coil 6. This reduces intrusion and improves stability. The specific function of this support member 12 is as follows. That is, the inner container 1
Frictional heat generated on the surface of the support member 12 has a steep temperature gradient due to the insulating cloth 8, which acts as a resistance to thermal movement and prevents heat from entering. Further, the heat that penetrates beyond the insulating cloth 8 reaches the metal pipe 7 having high thermal conductivity, is transmitted through the metal cloth 7, and is radiated to the refrigerant in the inner container 10.

[Brief explanation of the drawing]

Figure 1 is a schematic plan view showing a superconducting electromagnet device;
Figure 2 is a cross-sectional view showing a conventional superconducting electromagnet device;
FIG. 3 is a sectional view showing a superconducting electromagnet device according to the present invention. 6...Superconducting coil, 7...Metal pipe, 8
...Insulating cloth, 9...Synthetic resin, 10...Inner container.

Claims (1)

[Claims] 1. An impregnated superconducting coil, an inner container containing the impregnated superconducting coil, filled with a cryogenic refrigerant, and formed into a tube shape along the winding direction of the superconducting coil, and an inner container provided surrounding the inner container. A superconducting electromagnet device comprising a heat insulating container and a support member that supports the superconducting coil while electrically and thermally insulating it from the inner container, the support member;
A superconducting electromagnet device characterized in that a metal pipe is arranged inside a laminated insulating cloth woven from electrically insulated wires having low thermal conductivity, and the superconducting coil is integrated with a synthetic resin.