JPH07169997A - Inner casing holding device of superconductive magnet - Google Patents

Abstract

PURPOSE:To make thermal insulation between outer casing and inner casing on the same level as conventional one and to make it possible to maintain a sufficient insulation in terms of vibration by making up a support cylinder with such a nonmagnetic damper of the dislocation type as Fe-Ni-Mn alloy and the like as a material with a high vibration damping power. CONSTITUTION:Damper made metal fittings 15A and 16A are provided between a connecting rod 14 connected to an outer casing 9 and an FRP-made holding cylinder (high-temperature side) 13, and a metal support cylinder 12A made of nonmagnetic damper of the dislocation type such as Fe-Ni-Mn alloy and the like is provided between the FRP-made support cylinder (high-temperature side) 13 and the FRP-made support cylinder (low-temperature side) 11. The inner casing holding device is constructed that a thermal shield plate 7 is supported by a junction of the FRP-made support cylinder (low-temperature side) 11 and the metallic support cylinder 12A. By constructing the inner casing holding device in this manner, vibration transmitted from the outer casing 9 to the inner casing 6 will certainly pass through the damper-made support cylinder 12A, where the majority of the vibration energy is converted into thermal energy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner tank supporting device for a superconducting magnet of a magnetic levitation railway.

[0002]

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

Superconducting magnet devices 1 used for levitation, guidance, and propulsion of a magnetically levitated railway are installed on both left and right sides of a bogie 3 below a vehicle 2 to correspond to a ground coil 4 provided on a track. To surface, guide, and promote.

The superconducting magnet 1 comprises a superconducting coil 5, an inner tank 6 for accommodating the superconducting coil 5 and maintaining it at a cryogenic temperature, a heat shield plate 7 for covering the inner tank, and an inner tank supporting device 8 for holding the heat insulation. It is configured to be housed in an outer tank 9 of a vacuum container which is housed in a hanging manner via.

The superconducting magnet has such a structure and a role, and plays the role of a drive electric conductor and wheels of a truck in a conventional electric train. Therefore, in addition to the strength and rigidity to withstand the driving force described above as the performance required for the superconducting magnet, the weight reduction is required as a part of the unsprung weight of the vehicle related to the dynamic performance of the vehicle or for the levitation force. To be

However, in order to prevent heat from entering from the outside into the inner tank 6 containing the superconducting coil 5 and to minimize vaporization of the cooling liquid helium, the inner tank 6 is supported with respect to the outer tank 9. The inner tank supporting device 8 cannot be made too large and strong.

Further, in the case of the magnetic levitation railway, the superconducting magnet moves along the moving magnetic flux generated in the ground coil 4 continuously arranged on the track 10, but the electromagnetic force acting from the ground coil 4 at this time is Since high-order harmonics are included and the harmonic excitation gives a severe load to the superconducting magnet, a superconducting magnet capable of withstanding these loads is required.
As a structure of the inner tank supporting device 8 which supports the inner tank 6 as described above, a multi-cylinder pinching method having a structure shown in FIG. 4 is adopted. This has a structure that has sufficient mechanical strength against electromagnetic force and at the same time reduces heat intrusion.

That is, the inner tank 6 is first supported by an FRP (fiber reinforced plastic) support tube 11 (low temperature side), which is supported by an aluminum (or stainless steel) support tube 12, and then an FRP support tube 13 It is a triple-supporting sandwiching method that supports on the (high temperature side). This is fixed to the fastening rod 14 fastened to the outer tub with the holding metal fittings 15 and 16.

With such a structure, strength (compression resistance and tensile strength) and weight saving of the support cylinder are secured together with heat insulation.

[0010]

As described above, the superconducting magnet must be severely lightweight and must endure electromagnetic harmonic excitation. Moreover, since the harmonic vibrations reach several hundreds of hertz, if the partial vibration of the superconducting magnet is not considered, AC loss due to relative vibration between the inner tank and the outer tank and mechanical loss of the inner tank will occur. Occurs.

The mechanism of this AC loss and mechanical loss generation will be described below.

The outer plate of the outer tub 9 for fixing the inner tub supporting device 8 is composed of a thick plate having the maximum thickness that is structurally and dimensionally allowable. Causes partial vibration. When the vibration of the outer tank 9 expands at the resonance point or the like, the vibration of the outer tank is directly transmitted to the inner tank 6.

When the vibration is transmitted to the inner tank 6, mechanical frictional heat (mechanical loss) is generated in the inner tank itself even if it is thermally insulated from the outside world, and the relative distance from the superconducting coil is increased. Due to the change, Joule heat (AC loss) corresponding to the eddy current generated on the inner tank surface is generated. When such mechanical loss and AC loss occur in the inner tank, the temperature of the inner tank, which is kept at a low temperature by a refrigerant such as liquid helium, rises, and the stability of the superconducting magnet cannot be ensured.

When the vibration of the inner tank further increases and the evaporation amount of the refrigerant such as liquid helium sharply increases and the temperature of the inner tank further rises, the superconducting state is destroyed (quenching) and the refrigerating capacity of the refrigerator of the refrigerant is increased. If it exceeds, there is a risk that the floating railway system itself will not be established.

It is an object of the present invention to obtain an inner tank supporting device for a superconducting magnet, which has the same thermal insulation between the outer tank and the inner tank as the conventional one, and can sufficiently insulate vibrationally.

[0016]

[Means for Solving the Problems] A part of an inner tank supporting device of a multi-cylinder sandwiching type housed in a superconducting magnet device of a levitation railway has a mechanical property equivalent to that of stainless steel and has a vibration damping capability. As a high material, a supporting cylinder is made of a supporting cylinder made of a dislocation type non-magnetic damping material such as Fe-Ni-Mn alloy, and if necessary, a good heat conductive metal film is formed on the supporting cylinder, and a thermal anchor is formed. Set up.

[0017]

The multi-cylinder sandwich type inner tank supporting device having the above-described structure has good thermal insulation between the inner tank and the outer tank,
Moreover, the mechanical vibration transmitted from the outer tank to the inner tank is significantly reduced.

[0018]

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

A fastening rod 14 joined to the outer tank 9 and F
Bracket 15 made of damping material between the RP support cylinder (high temperature side) 13
A and 16A are provided, and FRP support cylinder (high temperature side) 13 and F
Fe-Ni-Mn between the RP support cylinder (low temperature side) 11
A metal support cylinder 12A made of a dislocation type non-magnetic damping material such as an alloy is provided. The heat shield plate 7 is supported at the joint between the FRP support cylinder (low temperature side) 11 and the metal support cylinder 12A.

By constructing the inner tank support device in this way, the vibration transmitted from the outer tank 9 to the inner tank 6 surely passes through the support cylinder 12A made of the vibration damping material. Most are converted to thermal energy. Since the vibration-damping material support cylinder 12A is connected to the heat shield plate 7, most of this heat energy is transferred to the heat shield plate 7 and does not increase the heat entering the inner tank 6.

Further, the support cylinder 12A having a high vibration damping ability has a material strength equivalent to that of stainless steel, and the mechanical strength of the inner tank support device 8 is also satisfied.

As described above, the mechanical loss of the inner tank 6 is greatly suppressed, and the superconducting magnet becomes stable without increasing the heat entering the inner tank.

Other Embodiments (See FIG. 2) In the inner tank supporting device 8 as in the above-mentioned embodiment, a good heat conductor 17 such as aluminum, copper, silver or the like is attached to the pressing metal fittings 15A, 16A, It is preferable to form a thin film on the surface of the vibration-damping material support cylinder 12A by plating, spraying, bombarding, pressure bonding, or the like, and remove the thermal anchor 18 from the cooling pipe 19.

With this structure, the heat energy converted by the damping material supporting cylinder 12A is more reliably transmitted to the heat shield plate 7, so that the temperature rise of the damping material supporting cylinder 12A is significantly increased. It is reduced, heat invasion into the inner tank 6 can be suppressed, and the superconducting magnet becomes stable.

In the above embodiment, the case where the supporting device has a multi-cylindrical pipe structure in which a folded support cylinder group is connected and supported has been described. However, a general structure having a mechanical strength by connecting a high temperature part and a low temperature part is described. The same effect can be obtained even when applied to a heat-insulating support material.

[0026]

According to the present invention, when the vibration expands at the resonance point of the outer tub of the superconducting magnet, the amount of vibration transmitted to the inner tub is reduced, thereby suppressing mechanical loss and AC loss of the inner tub. You can As a result, the temperature rise of the inner tank container kept in a cryogenic state by the refrigerant such as liquid helium is suppressed, and as a result, the characteristics of the superconducting magnet become stable.

[Brief description of drawings]

FIG. 1 is a sectional view of a superconducting magnet device according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a conventional magnetic levitation railway equipped with a superconducting magnet device.

FIG. 4 is a partial cross-sectional view of FIG.

[Explanation of symbols]

 1 ... Superconducting magnet device 2 ... Vehicle 3 ... Bogie 4 ... Ground coil 5 ... Superconducting magnet coil 6 ... Inner tank 7 ... Heat shield plate 8 ... Support device 9 ... Outer tank 10 ... Orbit 11 ... FRP support cylinder (low temperature side) 12 ... Metal support cylinder 12A ... Damping material support cylinder 13 ... FRP support cylinder (high temperature side) 14 ... Fastening rods 15, 16 ... Holding metal fittings 15A, 16A ... Damping material holding metal fittings 17 ... Thermal conductive metal Membrane 18 ... Thermal anchor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomohisa Yamashita No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu factory

Claims (4)

[Claims] 1. A cylindrical support device comprising a cryogenic inner tank containing a superconducting magnet coil, a heat shield plate covering the inner tank, a support member formed by stacking a cylinder made of metal or FRP, and a metal fitting for the support member. In a superconducting magnet device comprising an outer tank, etc., which is supported by the inner tank and is accommodated in a suspension, and the inside of which is vacuum heat insulated, the metal supporting cylinder and the pressing metal fitting in contact with the outer tank or the heat shield plate are made of stainless steel. An inner tank support device for a superconducting magnet device, which is characterized by a multi-cylindrical support device made of a dislocation-type non-magnetic damping metal such as an Fe-Ni-Mn alloy having a higher vibration damping capability. 2. A support cylinder or a press fitting part which is in contact with the heat shield plate or the outer tub, and whose surface is made of aluminum, copper,
2. The inner tank supporting device for a superconducting magnet device according to claim 1, wherein the device is made of a dislocation type non-magnetic damping metal having a vibration damping capacity higher than that of stainless steel on which a film of a good heat conductor such as silver is formed. 3. The inner tank supporting device for a superconducting magnet device according to claim 2, wherein the good thermal conductor film is formed on a surface of a material having a high vibration damping ability to have a thickness of 1 mm or less. 4. A thermal anchor is provided on a support cylinder made of a material having a high vibration damping ability.
An inner tank supporting device of the superconducting magnet device described.