JPH1198614A - Superconducting megnet device for magnetically levitated car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the stability of persistent current switches for making a coil current flowing in a superconducting coil a persistent mode, by putting the persistent current switches in a refrigerant storing tank. SOLUTION: In this superconducting magnet device, the positions of installation of persistent current switches 3, a part where the persistent current switches 3 are connected to each other for connecting between the internal tanks of gas retrieving pipes 6, and a position for a current lead 11 to be arranged are moved to the inside of a tank 10 which is separated by a distance from a ground coil, and has small magnetic disturbance and vibration, from an external tank container 5 which receives high-frequency magnetic disturbance from ground coils while a car is running, and is under the most strict condition in respect to vibration. Consequently, it becomes possible to enhance the stability of the persistent current switches 3, since it becomes possible to reduce vibration which the persistent current switches 3, the gas retrieving pipes 6, and the current lead 11 receive while a car is running. Besides, it becomes possible to reduce the quantity of evaporation of a refrigerant by heat generated by rubbing friction caused by vibration of the gas retrieving pipes 6 and the current lead 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting magnet device mounted on, for example, a magnetic levitation vehicle.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view schematically showing a sectional structure of a conventional floating railway vehicle disclosed in Japanese Patent Laid-Open No. 6-20831. In FIG. 7, reference numeral 12 denotes a superconducting magnet device, which is fixed to both side surfaces of the bogie frame 9. The vehicle body 13 is mounted on the bogie frame 9 via an air spring 19. 14 is a levitation guide coil installed vertically on the ground side, 15 is a propulsion coil installed vertically on the ground side, and is laid on both sides of the running path at an equal pitch along the running path. . FIG. 8 is a side view schematically showing the configuration of the superconducting magnet device 12 in FIG. 7, and FIG.
FIG.

In FIGS. 8 and 9, reference numeral 1 denotes a superconducting coil formed by winding a superconducting element wire in a racetrack shape (elliptical shape) and impregnating with a resin, and 2 denotes a nonmagnetic material, for example, stainless steel. This is an inner vessel container that houses the superconducting coil 1 and is filled with a refrigerant such as liquid helium. Reference numeral 3 denotes a permanent current switch for turning the current of the superconducting coil 1 into a closed loop, and is configured by winding a superconducting element wire. The permanent current switch 3 is installed near the superconducting coil 1 and the inner vessel 2.

A radiation shield plate 4 surrounds the inner vessel 2 and insulates radiant heat entering from the outside. The radiation shield plate is usually cooled by liquid nitrogen. Reference numeral 5 denotes an outer tank container (simply referred to as an outer tank) for maintaining the vacuum in which the inner tank container 2, the radiation shield plate 4, and the like are housed in an insulated state with the outside.

[0005] The superconducting coil 1, the inner vessel 2, and the radiation shield plate 4 are fixed to the outer vessel 5 via a heat insulating support 7.
The outer tank container 5 is fixed to a bogie frame 9 via fixing bolts 8. Reference numeral 10 denotes a tank for storing liquid helium for cooling the superconducting coil, which is installed above the outer tank 5 and connected to the inner tank 2 by a helium pipe 20.

[0006] Reference numeral 6 denotes a gas recovery pipe for recovering the refrigerant gas evaporated from the inner vessel 2. As shown in FIG. 10, the inside of the pipe is a liquid injection pipe for supplying the refrigerant to the inner vessel 2 from the outside. 6a, a supporting member 6 provided with a supply pipe 6b for supplying the refrigerant from the tank 10 to the inner tank 2 and a superconducting wire 6c for supplying a current to the superconducting coil 1 at an appropriate pitch.
d.

Reference numeral 11 denotes a current lead for supplying a current to the superconducting coil 1 from the outside. The current lead 11 is housed in the outer vessel 5 in the same manner as the superconducting coil 1, the inner vessel 2 and the radiation shield plate 4. The current lead 11 is, as shown in FIG.
The pipe 11a has a double pipe configuration of a pipe (conductor) 11a for supplying an electric current and a pipe 11b for securing a vacuum.
An electrical insulator 11c is provided between the first and the second insulators 11b.
The superconducting magnet device 12 includes a plurality of these superconducting coils 1,
Inner tank 2, permanent current switch 3, and one tank 10
It consists of.

During traveling of the vehicle, a vertical levitation force for levitation of the vehicle and a lateral guidance force for maintaining the vehicle at the center of the track are applied between the superconducting coil 1 and the levitation guide coil 14. The superconducting coil 1 and the propulsion coil 15
A propulsion force in the front-rear direction for propelling the vehicle works between them. When the vehicle travels, a pulsating component due to a magnetic field variation due to the ground coil arrangement laying pitch is added to the levitation force, the guide force, and the propulsion force. The vessel 5 is vibrated by high-frequency electromagnetic disturbance proportional to the speed. The electromagnetic disturbance and the vibration caused by the electromagnetic disturbance are transmitted to all parts of the superconducting magnet device 12.

[0009]

Since the conventional superconducting magnet device is configured as described above, the outer vessel of the superconducting magnet device facing the ground coil is vibrated by high-frequency electromagnetic disturbance while the vehicle is running. There is also a problem that the stability of the permanent current switch is reduced because the permanent current switch housed inside the outer vessel container is also subjected to vibration.

Further, since the permanent current switch is disposed near the superconducting coil, it receives a strong magnetic field generated by the superconducting coil, and the stability of the superconducting element wire constituting the permanent current switch is reduced. There is a problem that the stability of the operation of the current switch is reduced.

In addition, while the vehicle is running, the outer vessel of the superconducting magnet device facing the ground coil is vibrated by high-frequency electromagnetic disturbance, and the gas recovery pipe housed in the outer vessel is also subjected to the vibration. Rubbing occurs between the liquid injection pipe, the supply pipe, the superconducting wire, and the support member, and there is a problem that the amount of refrigerant evaporated increases due to the mechanical frictional heat generated at this time.

Further, the current leads housed in the outer vessel are also subjected to vibration, and rubbing occurs between the inner double pipe and the electric insulator, and the amount of evaporation of the refrigerant increases due to heat generated by mechanical friction at this time. There was a problem of doing.

The present invention has been made to solve the above problems, and has as its object to provide a superconducting magnet device that can improve the stability of a permanent current switch. It is another object of the present invention to provide a superconducting magnet device capable of reducing frictional heat generation due to vibration of a current lead or a gas recovery pipe.

[0014]

A superconducting magnet device according to the present invention comprises a superconducting coil formed by winding a superconducting wire into a racetrack shape, and a superconducting coil formed so as to surround the superconducting coil and immersed in a refrigerant. An annular inner vessel container for storing the inner vessel vessel, an outer vessel vessel for accommodating the inner vessel vessel in a vacuum atmosphere, a permanent current switch for setting a coil current flowing in the superconducting coil to a permanent current mode, and the refrigerant In a superconducting magnet device provided with a tank for storage above the outer tank, the permanent current switch is housed inside the tank.

The fact that the permanent current switch is installed at the tank portion where the vibration is small has an effect that the vibration received by the permanent current switch is reduced as compared with the conventional superconducting magnet device. Further, as compared with the conventional superconducting magnet device, the position of the permanent current switch is located farther from the superconducting coil, so that the strength of the magnetic field received by the permanent current switch is reduced and the operation is stabilized.

According to the present invention, a current lead for supplying a current from outside to the superconducting coil is provided in the tank.

The placement of the current leads in the upper tank portion of the outer tank has the effect of reducing the electromagnetic high-frequency vibration applied to the current leads.

Further, in the present invention, all the refrigerant gas recovery pipes for recovering the refrigerant gas from the inner tank are provided so as to directly connect the tank and the inner tank.

Since there is no gas recovery pipe installed in the outer tank and connecting the inner tanks, the gas recovery pipe does not receive the electromagnetic high frequency vibration, and the heat generation is reduced.

[0020] Further, in the present invention, the tank is mounted on a bogie frame.

Attaching the tank portion to the bogie frame has the effect of reducing the vibration of the tank during traveling of the vehicle and at the same time reducing the electromagnetic high-frequency vibration received by the one stored inside.

Further, according to the present invention, the outer tank container is arranged on both sides of the bogie frame in parallel with the train traveling direction, and the tank is arranged on the upper part of the bogie frame at right angles to the train traveling direction. The permanent current switch of the superconducting coil housed in the outer vessel container on both sides is housed together.

The installation of the tank on the bogie frame in a direction perpendicular to the traveling direction is required when the train is accelerated or decelerated, or when the train is on a slope, due to the inclination of the liquid level of the refrigerant in the tank. It has the effect of reducing exposure from the liquid surface. In addition, using the tanks of the left and right superconducting magnet devices also has the effect of reducing the space for the tanks.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a main part of the superconducting magnet of the present invention. In the figure, reference numeral 5 denotes an outer vessel, which is the same as the conventional apparatus in that the superconducting coil 1, the inner vessel 2, the radiation shield plate 4 and the like are housed inside. The permanent current switch 3 installed inside the inner tank 2 in the conventional FIG. 8 changes the installation location to the inside of the tank 10, and accordingly, the gas recovery pipe 6 and the current lead 1 are changed.
1 is installed in the tank 10. The tank 10 is installed on the outer tank 5 in the same manner as in the conventional FIGS. For the sake of illustration, what should be indicated by a dotted line inside the tank 10 is also indicated by a solid line.

In the superconducting magnet device shown in FIG. 1, the permanent current switch 3, the portion where the permanent current switches 3 are connected to connect the inner tanks of the gas recovery pipe 6, and the installation position of the current lead 11 are The tank 10 which is at a distance from the ground coil 14 and has a small electromagnetic disturbance and a small vibration from the outer tank container 5 under the most severe vibration conditions due to the high frequency electromagnetic disturbance from the ground coil 14 while the vehicle is running. Since the vehicle is moved inside, the vibration received by the permanent current switch 3, the gas recovery pipe 6, and the current lead 11 while the vehicle is running can be reduced. Therefore, the stability of the permanent current switch 3 can be improved. Further, it is possible to reduce an increase in the evaporation amount of the refrigerant due to the frictional heat generated by the vibration of the gas recovery pipe 6 and the current lead 11.

Further, since the distance between the permanent current switch 3 and the superconducting coil 1 is larger than that of the conventional device, the magnetic field intensity received by the permanent current switch 3 is smaller than that of the conventional device, and Stability is improved.

Embodiment 2 FIG. FIG. 2 is a perspective view showing Embodiment 2 of the present invention. The tank 10 is separated from the outer container 5 of the superconducting magnet device main body and attached to the bogie frame 9. FIG. 3 shows an example of the trolley frame 9 as long as it can be anywhere. FIG. 3 is a perspective view showing an example of the arrangement of the tank on the bogie frame 9. The tank 10 is supported and fixed via a fixing seat 16 to a side beam 9b of the bogie frame 9 on which the superconducting magnet device is installed. Further, a permanent current switch 3, a gas recovery pipe 6, and a current lead 11 are housed inside the tank 10.

In the superconducting magnet device shown in FIG.
0 is the side beam 9 of the bogie frame 9 where the superconducting magnet device is installed.
b, the rigidity of the side beam 9b can be used to reduce the vibration of the tank portion 10, and the permanent current switch 3, gas recovery pipe 6, and current lead 11 received inside the tank 10 receive vibration. Can be reduced. Therefore, the stability of the permanent current switch 3 can be improved, and the increase in the amount of evaporation of the refrigerant due to the frictional heat generated by the vibration of the permanent current switch 3, the gas recovery pipe 6, and the current lead 11 can be reduced.

Embodiment 3 FIG. 4 is a perspective view showing Embodiment 3 of the present invention. Internal permanent current switch 3,
Tank 1 containing gas recovery pipe 6 and current lead 11
Numeral 0 is installed horizontally on the cross beam 9a connecting the left and right beams of the bogie frame 9 with respect to the traveling direction of the vehicle.

In the superconducting magnet device shown in FIG.
Since 0 is installed horizontally on the cross beam 9 a connecting the left and right beams of the bogie frame 9, the rigidity of the cross beam 9 a can be used to reduce the vibration of the tank 10. At the same time, the vibration received by the permanent current switch 3, the gas recovery pipe 6, and the current lead 11 housed in the tank 10 can be reduced. Therefore, the stability of the permanent current switch 3 can be improved, and the increase in the amount of evaporation of the refrigerant due to the frictional heat generated by the vibration of the permanent current switch 3, the gas recovery pipe 6, and the current lead 11 can be reduced.

As shown in FIG. 5, by arranging the tank 10 horizontally (FIG. 5 (A)), a gradient section in the vehicle traveling direction when the same amount of refrigerant enters the tank 10 is obtained. The change in the liquid level of the refrigerant when the vehicle stops or when the vehicle accelerates or decelerates is smaller than in the conventional case (FIG. 5B). For this reason, even when the vehicle is stopped or accelerated or decelerated in a gradient section where the refrigerant amount is small, when the tank 10 is placed horizontally, the permanent current switch 3 installed at the bottom of the tank 10 is not immersed in the refrigerant. Does not occur. The magnetic levitation vehicle has a moderate bank (lateral inclination) at the curve point, and even if there is a centrifugal force due to the curve, the apparent direction of gravity is always perpendicular to the vehicle floor, so the tank is in the horizontal direction. However, even if the refrigerant is installed, there is little danger that the refrigerant will move to one side due to centrifugal force.

Embodiment 4 FIG. FIG. 6 is a perspective view of a superconducting magnet device according to Embodiment 4 of the present invention. In the figure, reference numeral 18 denotes a shared tank configured to be shared with the two superconducting magnet devices 1 installed at both ends of the bogie frame 9. Further, inside the common tank 18, the permanent current switch 3, the gas recovery pipe 6, and the current lead 11 for the superconducting magnets 12 on the left and right sides of the bogie frame are housed together.

In the superconducting magnet device shown in FIG. 6, the stability of the permanent current switch 3 can be improved, and the increase in the amount of refrigerant evaporated due to frictional heat generated by the vibration of the gas recovery pipe 6 and the current lead 11 can be reduced. Needless to say, one common tank 1 is provided for two superconducting magnet device main bodies 12.
8, the system configuration is simplified and the weight of the system can be reduced.

[0034]

As described above, in the superconducting magnet device of the present invention, the permanent current switch is installed in the tank portion which is hardly affected by high frequency electromagnetic disturbance from the ground coil while the vehicle is running. The received electromagnetic disturbance and vibration are smaller than in the conventional superconducting magnet device. Further, since the position of the permanent current switch is located farther from the superconducting coil, the received magnetic field strength is reduced. Therefore, the stability of the permanent current switch can be improved.

According to the present invention, since the current lead for supplying a current to the superconducting coil from the outside is provided in the tank, high-frequency electromagnetic disturbances received by the current lead from the outside are reduced, and the frictional heat generated by the rubbing inside the current lead is reduced. It is possible to reduce an increase in the evaporation amount of the refrigerant.

Further, according to the present invention, since the gas recovery pipe connecting the inner tanks is provided in the tank, high-frequency electromagnetic disturbances received from the outside are reduced, and the amount of refrigerant evaporation due to frictional heat generated inside the pipe is reduced. The increase can be reduced.

Further, according to the present invention, since the tank accommodating the permanent current switch is disposed directly above the bogie frame, high-frequency electromagnetic disturbance received by the permanent current switch from the ground coil is further reduced, and the operation of the permanent current switch is reduced. It can be more stable.

Further, according to the present invention, the tank containing the permanent current switch is disposed on the upper part of the bogie frame so as to be orthogonal to the traveling direction of the train. There is an effect that a stable operation can be expected without exposing the current switch from the refrigerant. Further, since the permanent current switch of the superconducting coil housed in the outer tank container on both sides is housed in one tank, the device can be downsized.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a superconducting magnet device according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing a configuration of a superconducting magnet device according to Embodiment 2 of the present invention.

FIG. 3 is a diagram showing another configuration of the superconducting magnet device according to Embodiment 2 of the present invention.

FIG. 4 is a diagram showing a configuration of a superconducting magnet device according to Embodiment 3 of the present invention.

FIG. 5 is an explanatory diagram for explaining an operation of the superconducting magnet of FIG. 4;

FIG. 6 is a diagram showing a configuration of a superconducting magnet according to a fourth embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a superconducting levitation type railway car on which a conventional superconducting magnet device is mounted, and a track configuration thereof.

FIG. 8 is a side view showing a main configuration of the superconducting magnet device of FIG. 7;

FIG. 9 is a cross-sectional view showing a main part cross section of the superconducting magnet device of FIG.

10 is a diagram showing an internal configuration of a gas recovery pipe of the superconducting magnet of FIG.

FIG. 11 is a diagram showing an internal configuration of a current lead of the superconducting magnet of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 superconducting coil 2 inner vessel container 3 permanent current switch 4 radiation shield plate 5 outer vessel vessel 6 gas recovery pipe 6 a injection pipe for supplying refrigerant from outside 6 b supply pipe for supplying refrigerant from tank 6 c superconducting wire 6 d support member 7 heat insulation Supporting material 8 Fixing bolt 9 Bogie frame 9a Cross beam of bogie frame 9b Side beam of bogie frame 10 Tank section 11 Current lead 11a Piping (conductor) for supplying current 11b Piping for holding vacuum 11c Electrical insulator 12 Super electromagnet device 13 Body 14 Floating guide coil 15 Propulsion coil 16 Fixed seat 18 Shared tank

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01F 7/20 H01F 7/20 E 6/00 ZAA H01L 39/04 H01L 39/04 H01F 7/22 ZAAA

Claims (5)

[Claims] A superconducting coil formed by winding a superconducting wire into a race track shape; an annular inner tank container formed so as to surround the superconducting coil and immersed in a refrigerant to house the superconducting coil; An outer tank container for storing the inner tank container in a vacuum atmosphere, a permanent current switch for setting a coil current flowing in the superconducting coil to a permanent current mode, and a tank provided at an upper portion of the outer tank for storing the refrigerant. A superconducting magnet device for a magnetic levitation train, wherein the permanent current switch is housed inside the tank. 2. The superconducting magnet device for a magnetic levitation train according to claim 1, wherein a current lead for supplying a current from outside to the superconducting coil is provided on the tank. 3. The superconducting device for a magnetically levitated train according to claim 1, wherein all refrigerant gas recovery pipes for recovering refrigerant gas from the inner tank are provided so as to directly connect the tank and the inner tank. Magnet device. 4. The superconducting magnet device for a magnetically levitated train according to claim 2, wherein the outer vessel is mounted on both sides of the bogie frame, and the tank is mounted on the bogie frame. 5. An outer tank container is disposed on both sides of the bogie frame in parallel with the train traveling direction, a tank is disposed above the bogie frame at right angles to the train traveling direction, and one tank is provided on both sides of the bogie frame. 5. The superconducting magnet device for a magnetically levitated train according to claim 4, wherein the common tank stores both permanent current switches of both superconducting coils accommodated in the outer tank container on the surface.