JPS6161273B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting magnet device used in magnetic levitation railways and the like, and particularly to a device for supporting an inner tank housing a superconducting coil.

In order to maintain the coil in a superconducting state, a superconducting magnet device houses the coil in a sealed container and further cools the coil by filling it with liquid helium as a coolant. Generally, to increase cooling efficiency,
The sealed container that houses the coil has a double structure consisting of an inner and outer tank. That is, an inner tank containing a coil and liquid helium is housed in an outer tank whose interior is evacuated. Moreover, since the current cooling method using liquid helium is an open cycle, it is important to minimize the amount of heat intrusion into the inner tank in order to effectively use liquid helium, which is expensive and has a low latent heat of vaporization. .

On the other hand, since the electromagnetic force generated in the magnet supports the vehicle via the inner and outer tanks, the support device connecting the inner and outer tanks must be strong and have good thermal insulation. In particular, when superconducting magnets are used in vehicles that run at high speed, the support device must have sufficient strength and rigidity to withstand vibrations and shocks that occur during the vehicle.

FIG. 1 is a front view showing an example of a conventional superconducting magnet device.

Superconducting coils 1 and 2 are fixed inside an inner tank 3 and supported in an outer tank 4. 5 is outer tank 4
6 is a seat for mounting on the vehicle body, etc., and 6 indicates ports for inlet and outlet of coolant, etc., which are simply shown here.

FIG. 2 is a sectional view of the central part of the superconducting magnet shown in FIG. 1.

The superconducting coils 1 and 2 are fixed inside an inner tank 3, and liquid helium 7 cooled and injected through ports 6a and 6b is stored therein. Furthermore, inner tank 3
is the outer tank 4 via the supports 10a, 10b, 10c.
is supported by The space between the outer tank 4 and the inner tank 3 is evacuated to prevent heat conduction by gas, and there is also a heat shield equipped with a cooling pipe 9 using liquid nitrogen or the like for intermediate cooling. A plate 8 is provided to cover the inner tank, and a support 10 is provided.
It is connected to the middle part of a, 10b, and 10c.
Other heat insulating materials may also be used here, but they are omitted for the sake of simplicity. 6c and 6d indicate ports for inlet and outlet of the intermediate coolant to the heat shield plate 8.

In addition to these, the superconducting magnet has a support in the direction perpendicular to the figure, a lead for supplying current to the superconducting coil, etc., but these will be omitted here for the sake of brevity.

FIG. 3 is a sectional view showing the structure of the supports 10a, 10b, and 10c. Bosses 11a, 1 are provided at both ends of the multiple tube 11, which is made of a material with relatively low thermal conductivity and high strength among metals such as stainless steel.
1b, the rod ends 12, 13 are connected thereto with screws, etc., and the spherical bushings of the rod ends 12, 13 are used to fix the inner tank 3 and the outer tank 4 with pins, etc. 14 is a cylinder with a flange for intermediate cooling, which is joined to the heat shield plate 8 with rivets or the like.

As explained above, in the conventional support structure, it is common to use multiple tubes 11 and the like to increase the heat conduction distance to reduce heat intrusion. However, when space is limited, such as when installing on a vehicle, the only option is to make the multilayer tube 11 thinner or fold it back more in order to make the tube long enough to reduce heat intrusion. However, if this is done, both strength and rigidity will decrease.

As a way to solve these problems, it is conceivable to use a material for the multi-tube 11 that has very low thermal conductivity and high strength, such as FRP, which is a plastic reinforced with glass or carbon. It is difficult to form a folded structure, and even when an adhesive structure is used, there are many practical problems such as insufficient adhesion reliability.

However, it is an object of the present invention to eliminate these drawbacks of the FRP configuration and provide a support device that utilizes FRP's extremely low thermal conductivity and high strength properties and does not reduce reliability. . An embodiment of the present invention will be described below based on the drawings.

FIG. 4 is a front sectional view of a support device according to the invention. The support seat 3a provided in the inner tank 3 is sandwiched between the low temperature heat insulating support tubes 15 from both sides, and further,
It is sandwiched between the flange of the intermediate support tube 16 and the high temperature heat insulating support tube 17, and both ends thereof are tightened by the fastening tube 19 and the flange 18. Here, the low temperature side heat insulating support tube 15 and the high temperature side heat insulating support tube 17 are made of the above-mentioned FRP, and the others are made of metal. The flange 18 and the flange 19a, which also has the other end of the fastening rod, are fixed to the outer tank 4, and the force from the inner tank 3 is transmitted to the outer tank 4 here. 14a and 14b are intermediate heat shield cylinders, one end of which is joined to the intermediate support cylinder 16, and the other end of which is joined to the heat shield plate 8.

Since the present invention has the configuration described above,
Since only a simple compressive force acts on FRP members, their high strength can be fully utilized without compromising reliability. Furthermore, even if it is shorter than a metal multilayer tube, the low thermal conductivity of FRP makes it possible to suppress heat intrusion to a much smaller extent.

In addition, it has a simple structure that just needs to be inserted from both sides, and the flanges at both ends are exposed on the outside, so it has a great advantage when assembling the entire superconducting magnet.

Furthermore, a flange portion 19a at one end of the fastening rod 19
If a screw 20 is provided on the holder and used as a mounting seat for mounting on the vehicle body, etc., the mounting method becomes easy and the force can be directly transmitted to the vehicle body, increasing the rigidity, and the outer tank structure can be simplified, making it easier to manufacture. To make it easier to clean the tank and to make a lightweight outer tank possible.

Furthermore, it is known that the thermal conductivity of FRP materials varies depending on their composition. For example, heat conduction from room temperature to liquid nitrogen temperature (77 kurvin) is smaller in glass-epoxy FRP than in carbon-epoxy FRP, and conversely, heat conduction from liquid nitrogen temperature to liquid helium temperature is lower in carbon-epoxy FRP. is small. Utilizing these differences due to the composition of FRP, the high temperature side heat insulating support tube 1
7 is made of glass-epoxy FRP, and the low-temperature side heat insulating support tube 15 is made of carbon-epoxy FRP. By selecting a combination, it is possible to obtain a support structure with even smaller heat penetration.

Although the present invention has been described with a configuration in which the high-temperature side heat-insulating support tube 17 is located on the inside as in the embodiment shown in FIG. 4, the object of the present invention can be achieved even if the high-temperature side heat-insulating support cylinder 17 is located outside. Also, for simplicity, intermediate cylinder 1
The case of a book has been explained, but it goes without saying that in applications where a reduction in rigidity is allowed, the heat insulation can be further improved by further layering support cylinders on the inside or outside. Also, in the explanation so far, the intermediate support tube was explained as being made of metal, but
Even if other materials are used, the object of the present invention can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional superconducting magnet, Fig. 2 is a front cross-sectional view taken along line - in Fig. 1, Fig. 3 is a cross-sectional view of section A in Fig. 2, and Fig. 4 is a cross-sectional view of a conventional superconducting magnet according to the present invention. 3
It is a sectional view of the supporting device corresponding to the figure. 1; 2...Superconducting coil, 3...Inner tank, 4...
Outer tank, 3a...Support seat, 15...Low temperature side heat insulating support tube, 16...Intermediate support tube, 17...High temperature side heat insulating support tube, 18...Flange, 19...Tightening rod, 19
a...Dual-purpose mounting seat.

Claims (1)

[Scope of Claims] 1. A double-structure sealed container for a superconducting magnet in which an inner tank housing a superconducting coil is attached to an outer tank via a support, including a high-temperature and low-temperature heat-insulating support tube made of reinforced plastic, an intermediate A superconducting magnet device characterized in that a support seat of an inner tank and an outer tank are fastened together by a support device consisting of a support cylinder and a fastening cylinder. 2. A superconducting magnet device according to claim 1, characterized in that the low-temperature heat insulating support tube and the high-temperature heat insulating support tube are made of different types of reinforced plastics suitable for their respective operating temperature ranges. .