JPH07307213A - Superconducting magnet system for levitation reilroad - Google Patents

Abstract

PURPOSE:To improve reliability in a superconducting magnet, by preventing heat and quench caused by vibration of an outer or inner container of the superconducting magnet system. CONSTITUTION:A superconducting magnetic system is mounted on a stage frame 8 with a vibration absorbing sheet 17, made of hardening resin, interposed between an outer container 13 and the mount face of a stage frame 8. Then, the vibration caused on the surface of the outer container 13 is suppressed by the vibration absorbing sheet 17, and heat and quench caused by a superconducting magnetic coil can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing a superconducting magnet device for driving a levitation railway to a vehicle underframe.

[0002]

2. Description of the Related Art A conventional superconducting magnet device for driving a levitation railway will be described with reference to FIGS.

A magnetically levitated railway vehicle 1 runs in a guideway 2 having a U-shaped cross section.

On the side walls 3 and 3 on both sides of the U-shaped guideway 2, side wall levitation guide coils 4 and 4 for generating a levitation force and a propulsion coil 5 for generating a propulsion force,
5 are arranged. The sidewall levitation coil 4 is composed of an upper levitation guide coil 4a and a lower levitation guide coil 4b. The side wall levitation guide coil 4 and the propulsion coil 5 are collectively referred to as a ground coil 6.

The magnetically levitated vehicle 1 traveling at high speed on the guideway 2 is provided with an underframe 8 to which a superconducting magnet device 7 is attached and fixed, and the superconducting magnets are provided at positions corresponding to the ground coils 6 on both side walls of the guideway 2. A magnet device 7 is provided.

The superconducting magnet device 7 is constructed as follows.

An inner tank 10 containing a superconducting magnet coil 9 in a cryogenic state, and a radiation shield plate 11 for covering the inner tank 10 in order to suppress heat intrusion and electromagnetic force due to radiation from the outside, A radiation shield plate cooling pipe 12 (a cross section is shown) for cooling the radiation shield plate 11 is provided,
The components of the apparatus are housed in an outer tank 13 whose inside is kept in a vacuum state in order to maintain a low temperature and adiabatic condition.

Further, a cooling medium for keeping the superconducting magnet coil 9 at a low temperature, a replenishing tank 14 for the cooling medium, and equipment such as piping for the cooling medium are provided above the outer tank 13.

[0009] The levitation type railway is a system in which the vehicle-side superconducting magnet device 7 having such a structure and the levitation guide coil 4 and the propulsion coil 5 on the side wall are magnetically levitated to run at high speed.

The superconducting magnet device is attached to the vehicle underframe as follows.

A hole 15 for a long bolt is provided on the superconducting magnet side, and a long bolt (not shown in FIG. 10) is passed through this hole to fix the superconducting magnet device 7 to the underframe 8. For this reason, the underframe 8 is provided with a mounting seat 16 with its surface protruding, and a long bolt is screwed into the screw hole provided in this frame and tightened to fix the superconducting magnet device 7.

[0012]

A traveling system of a levitation railway in which a superconducting magnet device 7 of this type is mounted for driving a vehicle, a side wall levitation guide coil 4 is provided so as to face the superconducting magnet 7 mounted in a vehicle 1. The propulsion coil 5 is arranged in the guideway 2, and alternating current is applied to the propulsion coil 5 at a frequency corresponding to the traveling speed of the vehicle to levitate and propel the vehicle. At this time, a harmonic electromagnetic disturbance determined by the pitch of the sidewall levitation guide coil 4 and the propulsion coil 5 and the traveling speed is applied to the superconducting magnet 7, and an electromagnetic force is generated on the surface of the outer tub 13 of the superconducting magnet 7.

However, the outer tank 13 of the superconducting magnet device is
Since this is not fixed to the underframe 8 (a space without support) except for a plurality of mounting seats 16 which are fixed, the surface of the outer tub 13 can be freely deformed. is there. For this reason, the phenomenon in which the outer tub 13 vibrates greatly due to the electromagnetic force may occur. This vibration is the inner tank 1
The vibration becomes large when it reaches 0, and particularly when it coincides with the resonance frequency of the superconducting magnet 7. When the vibration becomes large, the amount of heat entering the inner tank 10 which is kept at a low temperature by a refrigerant such as liquid helium sharply increases, and a phenomenon in which the amount of evaporation of liquid helium in the refrigerant sharply increases is observed. If the amount of penetration exceeds the refrigerating capacity of the refrigerant, the superconducting magnet 9 may instantly enter the quench state in which the superconducting magnet 9 transitions to the normal conducting state. This is one of the causes of lowering magnet performance and reliability.

As the reason why the amount of heat intrusion increases with the increase of vibration, it is considered that Joule heat due to the eddy current flowing on the surface of the inner tank constituent member and heat generation due to friction generated between the constituent members can be considered. In order to minimize the amount of penetration, it is necessary to reduce the vibration of the superconducting magnet device 7 as much as possible.

There are many structural restrictions on the underframe 8 and the superconducting magnet device 7 of the vehicle used for the levitation railway, and it takes a lot of time and time to develop a structure that covers them. The cost has been put in. It is not easy to change the structures of the underframe 8 and the superconducting magnet device 7 in order to reduce the vibration of the superconducting magnet device 7 as it is from the beginning. For this reason, there is a demand for a method of reducing the vibration of the superconducting magnet 7 more than before without changing the structures of the underframe 8 and the superconducting magnet 7.

The present invention has been made in view of the above-mentioned circumstances, and suppresses the vibration of the superconducting magnet without changing the conventional underframe structure and the structure of the superconducting magnet, and the performance and reliability of the superconducting magnet. The purpose is to obtain a mounting method capable of improving the performance as compared with the conventional one.

[0017]

In order to mount the outer tub of the superconducting magnet device on the underframe 8, first, the curable silicone rubber 17 for vibration suppression is not cured, and the mounting seat surface of the underframe 8 is removed. Affixed to the removed underframe surface 18. The superconducting magnet outer tank 13
The surfaces are brought into contact with each other and temporarily attached to the underframe 8. A long bolt (not shown in FIG. 1) for mounting the superconducting magnet device 7 is
After the temporary installation and the hardening of the curable silicone rubber seal 17 are completed, a long bolt (not shown in FIG. 1) is tightened with a predetermined tightening torque.

[0018]

In this way, by interposing the curable silicone rubber 17 between the superconducting magnet 7 and the underframe 8, the area of the superconducting magnet supporting the surface of the outer tub 13 increases, and the outer tub 13 vibrates. It is possible to improve the performance and prevent the quench.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on the embodiments shown in FIGS.

The basic structure of the underframe 8 and the superconducting magnet device 7 is
It is the same as the conventional one. However, a curable silicone rubber sheet 17 is attached to the underframe 8 for vibration suppression when the superconducting magnet device 7 is attached. For this reason, a mounting surface 18 is provided on the underframe 8. A non-cured silicone rubber sheet for vibration suppression is attached to the vibration suppression sheet mounting surface 18. The curable silicone rubber sheet 17 is provided with a hole larger than the mounting seat 16 so that the mounting seat 16 can be projected. The size of the silicone rubber sheet 17 is set to be slightly smaller than the outer circumference of the outer tank. Curable silicone rubber sheet 17 attached to underframe 8
The outer tank surface of the superconducting magnet 5 is pressed against and fixed with long bolts (not shown in FIG. 1).

The curable silicone rubber 17 is a clay-like material that is easily deformed with a slight force before the curing agent is mixed, but after the curing agent is mixed, it gradually hardens with the passage of time. It has a characteristic that it hardens until it has sufficient rigidity after a lapse of a predetermined time.

As shown in FIG. 2, the underframe 8 has a plurality of mounting seats 1 for fixing the surface of the outer tub of the superconducting magnet device.
6 is provided, and the mounting seat 16 is projected from the surface of the underframe 8.

On the mounting surface 18 of the vibration absorbing sheet, the curable sheet 17 before being hardened is attached slightly higher than the protruding dimension of the mounting seat 16 provided on the underframe 8 side.

In this state, FIG. 4 shows a state in which the superconducting magnet device 7 is held at a predetermined height, pressed against the sheet 17 and passed with a long bolt. The long bolt passed through the long bolt hole 15 of the outer tub 13 is screwed into the screw of the mounting seat 16 to fix the outer tub 13 to the underframe 8.

In FIG. 4, the long bolt is gradually tightened with an appropriate tightening torque after the long bolt is passed through the hole 15 for the long bolt of the superconducting magnet outer tank. With the tightening force of the long bolt, the sheet 17 is pressed and the outer tank is
It is pressed against the mounting surface side of the underframe 8.

Since the silicone rubber sheet 17 can be freely deformed before being cured, it is compressed and deformed by pressing the outer tank. When the long bolt is further tightened, the deformation of the silicone rubber sheet 17 increases, and the silicone rubber sheet 17 is filled between the underframe 8 and the outer tub of the superconducting magnet without any gap. Further, the outer tank surface is tightened with an appropriate tightening torque until it comes into contact with the fixing surface of the mounting seat 16 (FIG. 5).

From this state, the curable silicone rubber 17
However, a predetermined time is allowed to elapse until it hardens and has sufficient rigidity.
After a lapse of a predetermined time, the long bolt 14 is tightened with a predetermined tightening torque, whereby the superconducting magnet 7 and the underframe 8 are completely fixed, and the mounting work is completed.

The reason why the vibration of the superconducting magnet 7 is suppressed by such a configuration will be described below.

When an electromagnetic disturbance of higher harmonics determined by the pitch of the side wall levitation guide coil 4 and the propulsion coil 5 and the traveling speed is applied to the superconducting magnet device 7, the superconducting magnet device 7 is attached to the underframe 8 by the silicone rubber sheet. Since it is fixed without gaps at 17, the deformation of the outer tub can be restrained over the entire surface, and vibration can be efficiently suppressed.

Further, friction is generated at the contact surface between the sheet 17 and the outer tub 13, the energy of vibration of the outer tub 13 is consumed, and the vibration can be further reduced.

According to the present invention, the vibration of the superconducting magnet can be suppressed and the performance and reliability of the superconducting magnet can be improved more than before without changing the conventional underframe structure or the structure of the superconducting magnet.

(Other Embodiment 1 of the Present Invention, See FIG. 6) Another embodiment of the present invention will be described. The difference from the above-described embodiments of the present invention is the shape of the mounting surface of the curable sheet. When the outer tub 13 of the superconducting magnet is attached to the underframe 8, the seat mounting surface 18 is limited to only the peripheral portion of the mounting seat 16 on the underframe 8 side, and the seat 17 is interposed therebetween.

The outer tank portion of the superconducting magnet, which corresponds to the mounting seat 16, is also a fixed portion of the inner tank 10 including the superconducting coil 9. Therefore, by providing the vibration absorbing sheet 17 only on the peripheral portion corresponding to the mounting seat 16 of the underframe 8 and attaching the superconducting magnet device 7 to the underframe 8, the same effect as the above-described embodiment can be obtained. .

(Other Embodiment 2 of the Present Invention, See FIG. 7) The outer peripheral portion of the outer tub 13 of the superconducting magnet 7 serves as a vibration absorbing sheet mounting surface 18, and the sheet 17 is provided there.
By providing the vibration absorbing sheet 17 around the outer tank 13 of the superconducting magnet 7 as described above, the reliability of the superconducting magnet 7 can be improved by obtaining the same effect as that of the above-described embodiment.

[0035]

As described above, according to the present invention, the reliability of the superconducting magnet can be improved by suppressing the heat load on the superconducting coil and preventing the quench without changing the conventional underframe structure or the structure of the superconducting magnet. You can plan. As a result, the cost of newly developing the underframe structure and the structure of the superconducting magnet can be reduced, and the cost of the entire superconducting magnetic levitation vehicle system can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a mounting explanation of a superconducting magnet device according to the present invention.

FIG. 2 is a partial side view of FIG.

FIG. 3 is a side view when the partial attachment of FIG. 1 is performed.

FIG. 4 is a side view of FIG. 1 at the time of temporary mounting.

FIG. 5 is a side view of FIG. 1 when attached.

FIG. 6 is a perspective view showing another embodiment 1 of the device of the present invention for mounting the device.

FIG. 7 is an explanatory view of a device of another embodiment 2 of the device of the present invention.

FIG. 8 is a cross-sectional view of a conventional levitation railway.

9 is a partial detailed perspective view of FIG.

FIG. 10 is a perspective view of mounting a conventional superconducting magnet device.

[Explanation of symbols]

1 ... Vehicle 2 ... Guide way 3 ... Side wall 4 ... Side wall levitation guide coil 4a ... Upper side wall levitation guide coil 4b ... Lower side wall levitation guide coil 5 ... Propulsion coil 7 ... Superconducting magnet device 8 ... Underframe 9 ... Superconducting coil 10 ... Inside Tank 11 ... Radiation shield plate 13 ... Outer tank 16 ... Mounting seat 17 ... (For vibration absorption) Silicone rubber sheet 18 ... (For vibration absorption) Seat mounting surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kaoru Nakagaki, No. 1 in Toshiba Fuchu factory, Fuchu-shi, Tokyo (72) Inventor, Hiroyuki Nakao No. 1, Toshiba-cho, Fuchu, Tokyo Toshiba factory, Fuchu ( 72) Inventor Masashi Suto, No. 1, Toshiba-cho, Fuchu-shi, Tokyo Inside Toshiba Fuchu factory

Claims (3)

[Claims] 1. A vehicle comprising an inner tank containing a superconducting coil, a radiation shield plate for covering the outer conductive coil, an outer tank containing the superconducting coil in a vacuum, and other accessories, which are used as a vehicle drive source. In a magnetic levitation railway superconducting magnet device mounted on a side surface of an underframe, the outer surface of the underframe via a curable silicone rubber sheet attached to the underframe mounting surface in a thickness exceeding a mounting seat surface for absorbing vibration. A levitation railway superconducting magnet device characterized by fixing a tank. 2. The floating railway superconducting magnet device according to claim 1, wherein the attachment of the curable silicone rubber sheet is limited to the periphery of the mounting seat. 3. The levitation type superconducting magnet device for a railway according to claim 1, wherein the attachment of the curable silicone rubber sheet is limited to the outer periphery of the outer tank.