JPH0782928B2 - Superconducting magnet device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a superconducting magnet device, and particularly to a load supporting structure capable of safely supporting an inner tank when an abnormal load occurs. And a superconducting magnet device.

(Prior Art) Generally, in a superconducting magnet device, in order to keep the superconducting coil in a superconducting state, an inner tank containing the superconducting coil is filled with a cryogen such as liquid helium and cooled. For the purpose of reducing the amount of heat entering the inner tank from the outside, the inner tank that stores liquid helium has a double structure in which the inner tank is housed in an outer tank having a vacuum.

Therefore, the structure for supporting the load of the inner tank with respect to the outer tank is required to have a very good heat insulating property. At the same time, when installing this superconducting magnet device in a vehicle that runs at high speed such as a superconducting magnetic levitation railway,
It must have sufficient strength and structure to withstand the vibrations and shocks that occur during traveling.

As a superconducting stone device that meets such a technical problem, there is conventionally known a superconducting stone device provided with a load supporting structure of a multi-cylinder sandwiching method as described in JP-A-55-16678.

FIG. 2 shows an example of a conventional superconducting magnet device having such a load supporting structure of a multi-cylinder sandwiching type. In this conventional superconducting magnet device, an inner tank 2 in which a superconducting coil is housed is housed inside an outer tank 1 whose inside is kept in a vacuum state, and an inner tank is formed by a load supporting device 3 of a multi-cylinder pinch type. 2 is supported with respect to the outer tank 1. In this load supporting device 3, the inner periphery of a ring-shaped support seat 4 provided on the inner peripheral wall of the inner tank 2 is formed by synthetic resin support cylinders 5 and 6 having high strength such as FRP and excellent thermal insulation. When sandwiched, metal support cylinders 7 and 8 made of high strength such as stainless steel are fitted into the respective ends of the synthetic resin support cylinders 5 and 6. Further inside, synthetic resin support cylinders such as FRP 9,1
0, lightweight and high-strength metal support cylinders 11 and 12 such as aluminum, and further synthetic resin support cylinders 13 and 14 such as FRP are sequentially concentrically inserted. Then, connect both ends of the innermost synthetic resin support cylinders 13 and 14 to the fastening rod 1 with the flange 15.
All the support cylinders 5 to 14 are integrated by tightening with 6 and the screw fitting 18 with the flange 17.

The flange 15 of the fastening rod 16 and the flange 17 of the screw fitting 18 are welded to the outer tank 1 to maintain the airtightness of the outer tank 1, and the load between the inner tank 2 and the load support device 3 is applied to the outer tank 1 here. I'm telling you.

In the case of a superconducting magnet device having a structure in which the inner tank 2 is supported by the multi-cylinder pinch type load supporting device 3 with respect to the outer tank 1, the space formed by each of the supporting cylinders 5 to 14 serves as a heat insulating layer, Inner tank 2 containing liquid helium as a cryogen
Can be supported while maintaining high thermal insulation with respect to the outer tank 1. Reference numeral 19 is a secondary heat shield plate for reflecting the secondary heat from entering the inner tank 2.

(Problems to be Solved by the Invention) However, in such a conventional superconducting magnet device,
The load supporting device 3 of the inner tank 2 has excellent strength and rigidity in the axial direction, but has only about 1/4 to 1/5 the rigidity in the axial direction in the bending direction. Not not. Therefore, especially when this superconducting magnet device is installed in a vehicle, such as a superconducting magnetic levitation railway, not only the normal running load, but also the load during an abnormality, that is, the load during an emergency stop of the vehicle is taken into consideration. I need to put in.

The load at the time of this emergency stop works in a very short time, but against such an abnormal load at the time of an emergency stop, the stainless steel or other metal support cylinder is plastically deformed even if its deformation amount exceeds the elastic limit. However, there is a problem that the support cylinder made of non-metal such as FRP or synthetic resin may be destroyed and may not function as a load support.

The present invention has been made to solve such conventional problems. Even when an abnormal load is applied, the synthetic resin support cylinder does not significantly deform beyond its elastic limit, and the inner tank It is an object of the present invention to provide a superconducting magnet device that can stably support the above.

[Structure of the Invention] (Means for Solving the Problems) In the superconducting magnet device of the present invention, the inner tank is arranged concentrically with the synthetic resin supporting cylinder and the metal supporting cylinder alternately with respect to the outer tank. The multiple cylinders that are arranged are to be supported by a load supporting device of a pinch type, and are abnormal due to the formation of support protrusions on the inner or outer circumference of at least one of the synthetic resin support cylinder and the metal support cylinder. When a synthetic resin support cylinder is adjacent to the support cylinder when it is loaded, it contacts the outer metal support cylinder to prevent its excessive deformation.

(Operation) In the superconducting magnet device of the present invention, the load supporting device including the synthetic resin support cylinder and the metal support cylinder thermally supports the inner tank with respect to the outer tank. If the synthetic resin support cylinder undergoes misalignment deformation due to an abnormal load, the support projections cause the synthetic resin support cylinder to contact the inner or outer metal support cylinders adjacent to each other and cause excessive misalignment. Prevent deformation,
It is possible to prevent damage due to excessive deformation and to stably support the inner tank.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. The inner tank 2 is housed in the outer tank 1 whose inside is kept vacuum via a sub-heat radiation shield plate 19. The supporting seat 4 provided on the inner peripheral wall of the inner tank 2 is connected to the fastening rod 16 by the load supporting device 3, and the outer rod 1 supports the load of the inner tank 2 by the fastening rod 16. .

The structure of the load supporting device 3 is substantially the same as that of the conventional example.
Synthetic resin support cylinders 5 and 6, which have relatively high rigidity and excellent heat insulation, sandwich the support seat 4, and the ends of the synthetic resin support cylinders 5 and 6 have strength like stainless steel. The ends of the tall metal support tubes 7, 8 are fitted. Then, the inner end portions of the metal support tubes 7 and 8 are sandwiched by the synthetic resin support tubes 8 and 10 such as FRP arranged further inside, and further the metal support tubes 11 and 12 and the synthetic resin. Support tube 1
It is composed of 3 and 14 fitted in order.

A feature of this embodiment is that support projections 20 and 21 are formed on the outer periphery of the center side end portions of the metal support cylinders 7 and 11 in the load support device 3, and the gap δ in the support projections 20 and 21 is formed.
1 and δ2 are set narrower than the width of the adiabatic space. Under normal load conditions, the gaps δ1 and δ2 do not come into contact with the opposing support seat 4 and the metal support cylinder 8 and can maintain heat insulation. Moreover, due to abnormal load, the synthetic resin support cylinders 5 and 6 When the 9,9,10, etc. are deformed, those of a size that can contact the metal support cylinders 7,8,11,12, etc. so that the deformation does not become a large one that causes destruction. Is.

The operation of the superconducting magnet device having the above configuration will be described below. The outer tank 1 is kept in a vacuum state, the inner tank 2 is filled with liquid helium as a cryogen, and the superconducting coil is housed therein. The secondary heat shield plate 19 shields the secondary heat that enters through the outer tub 1 and prevents the transmission of the secondary heat to the inner tub 2.

The load support device 3 supports the inner tank 2 by the support seat 4,
The load from the inner tank 2 on the support seat 4 is 5 to 14 for each support cylinder.
The fastening rod 16 is supported by the outer tub 1 by this fastening rod 16. In addition, each support cylinder 5 of the load support device 3
The space formed by 14 is a heat insulating space, and the heat transfer from the outer tank 1 through the fastening rod 16 and the screw fitting 18 can be suppressed to a minimum.

When this superconducting magnet device is used in a superconducting magnetic levitation railway, when a load in the direction of misalignment is applied to the inner tank 2 due to an emergency stop during traveling, and each support cylinder 5-14 receives a bending load, a synthetic resin Due to the misalignment deformation caused by the support cylinders 5, 6, 9, 10, 13, 14 made of metal, the support protrusions 2 provided on the support tubes 7, 11 made of metal are provided.
0 and 21 move and come into contact with the supporting seat 4 and the metal supporting cylinder 8 which face each other through the gaps δ1 and δ2, and suppress centering displacement deformation. As a result, the synthetic resin support cylinders 5, 6, 9, 10, 13, 14 are prevented from being excessively deformed and their destruction can be prevented.

The contact between the inner and outer support cylinders impairs the heat insulating property of the load support device 3. However, such contact between the inner and outer support cylinders is a short time when an abnormal load is exerted. Since it only occurs, there is no fear that the loss of the heat insulating property will have a great influence on the inner tank 3.
Therefore, the inner tank 2 can be stably supported by the load supporting device 3 with sufficient strength while maintaining heat insulation.

The present invention is not limited to the above-described embodiment, and for example, the synthetic resin support cylinder of the load supporting device can be increased or decreased as necessary. Further, in the case of the above-mentioned embodiment, the supporting protrusion is formed at the end portion on the center side of the metal supporting cylinder so as to suppress the misalignment deformation of the synthetic resin supporting cylinder. It may be provided on the side of the resin support cylinder, or may be provided not only at one location but also at a plurality of locations in the axial direction, and the location and number of locations are not particularly limited.

[Effect of the Invention] As described above, according to the present invention, the inner tank is thermally insulated from the outer tank by the load supporting device of the synthetic resin supporting cylinder and the metal supporting cylinder provided in the central portion of the inner tank. Can be supported. Moreover, a supporting protrusion is provided on the inside or outside of at least one of the metal supporting cylinder and the synthetic resin supporting cylinder that are alternately arranged concentrically to form a gap narrower than the normal gap of the heat insulating space. Therefore, when the synthetic resin support cylinder is deformed by misalignment due to an abnormal load, it is possible to contact the adjacent metal support cylinder by the support protrusions, and the overall rigidity is increased, and the synthetic resin support cylinder is supported. The inner tank can be stably supported without excessive deformation such as destruction of the cylinder.

Further, since the metal support cylinder is made to bear the load at the time of the core misalignment deformation of the synthetic resin support cylinder, the thickness of the synthetic resin support cylinder for improving the strength against the core misalignment deformation is increased. It is not necessary to consider the increase and the weight of the load supporting device can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 1 ... Outer tank, 2 ... Inner tank 3 ... Load supporting device 5,6 ... Synthetic resin supporting cylinder 7,8 ... Metal supporting cylinder 9,10 ... Synthetic resin supporting cylinder 11, 12 ... Metal supporting cylinder 13, 14 ... Synthetic resin support cylinder 16 ... Fastening rods 20, 21 ... Support protrusions δ1, δ2 ... Gap

Claims (1)

[Claims] 1. A ring-shaped inner tank containing a superconducting coil is housed in an outer tank, and a synthetic resin support cylinder excellent in heat insulation and a metal with high strength are provided in the center of the inner tank. The support cylinders are alternately arranged concentrically and both ends of each are supported by the outer tank, and the inner peripheral wall of the inner tank is used as a support ring member for the outermost one of the support cylinders. The inner and outer metal adjacent to the inner or outer circumference of at least one of the synthetic resin support cylinder and the metal support cylinder when the synthetic resin support cylinder undergoes misalignment deformation due to an abnormal load. A superconducting magnet device comprising a support projection for preventing excessive deformation of the support cylinder by coming into contact therewith.