JPH0620012B2 - Inner tank support device for superconducting magnet - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an inner tank supporting device for a superconducting magnet mainly used for a superconducting magnetic levitation vehicle, and in particular, a plurality of supporting cylinders including a metal intermediate supporting cylinder one after another. The present invention relates to a multi-cylinder sandwiching type superconducting magnet inner tank supporting device in which a pair of cylinder groups each having a multi-tube structure are engaged with and supporting the inner tank.

[Technical background of the invention and its problems]

Currently, a superconducting magnetic levitation vehicle is being developed as one of the future transportation means. The superconducting magnet used in this superconducting magnetic levitation vehicle is constructed by supporting an inner tank containing a superconducting coil in an outer tank which is a vacuum container, and cooling and maintaining the inner tank at a cryogenic temperature with liquid helium or the like. To be done. By the way, in such superconducting magnets, it is necessary to block external heat from entering the cryogenic inner tank as much as possible, and a large load force acts on the inner tank when the vehicle is magnetically levitated. As the supporting device, a large load supporting strength and excellent heat insulating property are required. An inner tank supporting device of a multi-cylinder sandwiching type has already been known as one that satisfies such conditions.

The conventional multi-cylinder sandwiching type inner tank supporting device is first
To explain with reference to FIG. 0, reference numeral 1 in the drawing is an inner tank that stores a superconducting coil (not shown) and is cooled to a cryogenic temperature by liquid helium. This inner tank 1 is a supporting device in an outer tank 2 that is evacuated. It is supported by heat insulation. The inner tank support device has a structure in which a support seat 3 provided in the inner tank 1 is sandwiched and supported by a pair of upper and lower cylinder groups 4A and 4B each having a multi-tube structure by sequentially engaging a plurality of support cylinders. is there. The upper and lower cylinder groups 4A and 4B are large intermediate support cylinders 5A and 5B made of FRP or the like and having high strength and good heat insulation, and a metal intermediate having high strength such as stainless steel arranged on the inner periphery thereof. The support cylinders 6A, 6B and the small-diameter support cylinders 7A, 7B made of FRP or the like, which are arranged on the inner circumferences of the support cylinders 6A, 6B, respectively, are used, and the large-diameter support cylinders 5A, 5B are formed at the opposite end portions of the both. The support member 3 of the inner tank 1 is sandwiched and supported directly from above and below, and inner and outer flange portions 8a, 8b and 9a, 9b are formed at the upper and lower ends of the metal intermediate support cylinders 6A and 6B, respectively, and the upper and lower ends thereof (oppositely opposed to each other). Flange portion 8a protruding toward the outer circumference of
8b engages and supports the large-diameter support cylinders 5A and 5B so as to sandwich the opposite ends of the support cylinders 5A and 5B from above and below.
Collar parts 9a, 9b protruding toward the inner circumference of the opposite ends of A, 6B
Are engaged and supported so that the opposite ends of the small-diameter support cylinders 7A and 7B are sandwiched from above and below. The metal intermediate support cylinders 6A and 6B further extend from the opposite end side flange portions 9a and 9b and are fitted to each other inside and outside, and are fitted to each other.
10b is formed. In addition, the small diameter support cylinder 7A,
The opposite end of 7B has upper and lower spacer / support seats 11A and 11A.
It is fastened and supported by screwing and tightening a fastening screw rod 12 having a flange 12a that engages B and presses the upper support seat 11A with the lower support seat 11B. Then, the flange 12a of the fastening screw rod 12 and the lower support seat 1
A flange 13 which is screwed to 1B and also serves as a detent is welded and fixed to the upper and lower portions 2A and 2B of the outer tank 2 so as to maintain the airtightness in the outer tank 2 and receive the load force from the inner tank 1. It is designed to be transmitted to the outer tank 2.

Further, in the conventional inner tank supporting device for a superconducting magnet described above, the FRP as described above is used for the purpose of surely reducing the amount of invasion of external heat.
In addition to using a heat-insulating material as a support material, the upper and lower cylinder groups 4A, 4 can be used so that a heat anchor can be taken in the middle.
The heat shield plates 14A and 14B are connected to and attached to the flange portions 8a and 8b of the metal intermediate support cylinders 6A and 6B of B, and liquid nitrogen cooling type cooling pipes 15A and 15B are attached to the upper and lower heat shield plates 14A and 14B. Is installed.

By the way, when the above superconducting magnet is mounted on a vehicle and used, it is required to be lightweight and compact, and it has been devised to use a lightweight material such as aluminum for the outer tub 2 and the like. The conversion has reached its limit. In particular, by reducing the distance between the superconducting coil of the superconducting magnet on the car and the coil on the ground side, the mutual electromagnetic force can be increased, and the superconducting coil for obtaining electromagnetic force such as the set levitation force and propulsion force of the vehicle. Although it is very effective because it can reduce the required excitation force of (1), there was a problem in doing so.

That is, in the above-mentioned conventional inner tank supporting device for the superconducting magnet, the metal intermediate supporting cylinder 6 of the upper and lower cylindrical groups 4A and 4B is used.
Since the fitting portions 10a and 10b of the A and 6B are simply slidably fitted to each other, the thermal contact between them is completely insufficient and heat conduction is not performed. For this purpose, in order to take the heat anchor, the heat shield plates 14A and 14B are connected to both the intermediate support cylinders 6A and 6B, respectively, and the cooling pipe 15 is connected.
It was necessary to install A and 15B. Therefore, it is necessary to take a fitting space such as a pipe connection of the cooling pipes 15A and 15B on both the upper and lower sides, and inevitably the L dimension shown in the drawing is required, and the interval between the superconducting coil in the inner tank 1 and the ground side coil should be reduced. There was a problem that I could not. Further, as described above, since the cooling pipes 15A and 15B are respectively arranged on the upper and lower sides, the structure is complicated and the weight reduction and the compactness of the whole cannot be achieved.

[Object of the Invention]

The present invention has been made in view of the above circumstances. The metal intermediate supporting cylinders of the pair of cylinder groups have sufficient thermal contact with each other and can reach the same level each other at all times, and thus cooling pipes are not attached to each of them as in the conventional case. Also, it is possible to reliably take both thermal anchors on only one side, and it is possible to simplify the overall structure of the superconducting magnet and make it lightweight and compact, and reduce the distance between the superconducting coil in the inner tank and the ground, An object of the present invention is to provide an inner tank supporting device for a superconducting magnet, which is extremely effective in that the magnetomotive force required for the superconducting coil can be reduced and the size and weight can be further reduced.

[Outline of Invention]

In order to achieve the above-mentioned object, the superconducting magnet inner tank supporting device of the present invention comprises a pair of cylinder groups each having a multi-tube structure in which a plurality of supporting cylinders are successively engaged in a vacuum outer tank. A multi-cylinder pinch-support type superconducting magnet inner tank support device, in which the metal intermediate support cylinders of the two cylinder groups are fitted with a spring ring or a taper ring or mutually heated. By using materials having different contraction rates, they are sufficiently brought into thermal contact with each other so that the temperatures of the two are always at the same level, and the heat anchor by the cooling pipe is required only on one side.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS. In the figure, the same components as those shown in FIG. 10 are designated by the same reference numerals to simplify the description.

Here, the metal intermediate support cylinders 6A and 6B of the upper and lower cylinder groups 4A and 4B respectively have the fitting portions 10 on the opposite end sides thereof.
Not only is a and 10b simply slid-fitted as in the conventional case, but the fitting parts 10a and 10b can be connected to the collar parts 9a and 9b.
A groove 16 having a substantially C-shaped cross-section that opens to the inner circumference over b is formed, and a spring ring 17 having a substantially U-shaped cross-section as shown in FIG. The upper and lower intermediate support cylinders 6A and 6B are sufficiently brought into thermal contact with each other. That is, the spring ring 17 is pressed against the upper and lower intermediate support cylinders 6A and 6B by the spring effect to sufficiently secure the thermal contact between the two and to improve the heat conduction between them.

The heat anchors in the intermediate support cylinders 6A and 6B are performed by connecting the heat shield 14A to the upper end flange portion 8a of the upper intermediate support cylinder 6A and providing the cooling pipe 15A as in the conventional case. Only the heat shield plate 14B is attached to the lower end flange portion 8b of the cylinder 6B, and no cooling pipe is provided.

Thus, in the superconducting magnet inner tank supporting device having the above-described structure, the thermal contact between the upper and lower intermediate supporting cylinders 6A and 6B is sufficiently ensured by the spring ring 17, and the heat conduction is good through the spring ring 17. As a result, almost the same temperature level can always be reached without causing thermal imbalance. For this reason, it is possible to reliably remove both thermal anchors by installing cooling pipes on only one side of the upper and lower sides, instead of installing the cooling pipes on the upper and lower sides as in the past and removing the thermal anchors. As a result, as shown in FIG. 1, it is possible to provide the cooling pipe 15A only in the upper portion and not provide the cooling pipe in the lower portion, which simplifies the overall configuration of the superconducting magnet and is lightweight and compact. In addition, the space for mounting the lower part can be reduced from the conventional L dimension to an l dimension which is several times smaller, and the distance between the superconducting coil in the inner tank and the ground coil can be significantly reduced. As a result, the required magnetomotive force of the superconducting coil can be reduced, and the size and weight of the entire superconducting magnet can be reduced.

3 to 5 show modified examples of the spring ring 17 shown in FIG. 2. First, the spring ring 17A shown in FIG. 3 is made more elastic and effective in thermal contact. In order to ensure the above, a large number of slits 17a are formed at intervals in the circumferential direction.

The spring ring 17B shown in FIG. 4 has a structure in which a large number of notches 17b are formed for the same purpose as that shown in FIG.

Further, the spring ring 17C shown in FIG. 5 includes a plurality of spring thin plates c.
Are laminated, and a coating 17c 'made of, for example, copper having good thermal conductivity is polymerized on the outside of the lamination so as to have more elasticity, and the thermal conductivity of the coating 17c' is made more effective. .

Next, FIG. 6 shows another embodiment of the present invention, in which only the opposing end sides of the upper and lower intermediate support cylinders 6A and 6B are shown in cross section, and the other overall structure is the same as in FIG. It is omitted because it exists. Here, the fitting portion 10 further extending from the flange portions 9a, 9b on the opposite end sides of the upper and lower intermediate support cylinders 6A, 6B.
A groove 18 having a cross-section cross-section is formed on the outer circumference of the portions a and 10b, and a taper ring 19 for press-fitting is provided so as to surround the outer circumference of the groove, and the taper ring 19 is press-fitted at the upper and lower trumpet-shaped portions. The upper and lower intermediate support cylinders 6A, 6
The configuration is such that the thermal contact of B is sufficiently ensured, and the same effect as that of the above-described embodiment can be obtained even with this configuration.

7 and 8 show modified examples of the taper ring 19 described above.
9A has a structure in which a slit 19a is formed so as to have more elasticity, and the taper ring 19B in FIG. 8 has a structure in which a notch 19b is also formed so as to increase elasticity.

Still further, each of the spring rings 17, 1 shown in FIGS.
7A, 17B and the taper rings 19, 19A, 19B shown in FIGS. 6 to 8 are coated with a material having good thermal conductivity on the contact surface with respect to the intermediate support cylinder. Sufficient thermal contact is obtained and effective.

Further, FIG. 9 shows still another embodiment of the present invention, in which only a portion similar to that of FIG. 6 is shown in cross section. The upper and lower intermediate support cylinders 4C and 4D here are the flange portions 9c and 9d facing each other, and 10c and 10 extending further therefrom.
Although both d are similar in shape to the conventional one shown in FIG. 10, the intermediate support cylinder 6C having the fitting portion 10c on the outer peripheral side when fitted to each other is made of a material having a relatively large heat shrinkage rate, for example, The intermediate support cylinder 6D, which is made of aluminum (Al) and has a fitting portion 10d that fits on the opposite inner circumference, is made of a material having a small heat shrinkage rate, for example, titanium (Ti). In this way, the thermal contraction rates of the two are made different, and due to the difference, the fitting portions 10c and 10d are brought into close contact with each other to ensure sufficient thermal contact, and the same effect as described above can be obtained. Like

The present invention can be modified in various ways other than the above-described embodiment. For example, as shown in FIG. 1, the flange 12a and the flange 13 of the fastening screw rod 12 are welded and fixed to the outer tub 2 to obtain a cryogenic temperature. Although the supporting seat 3 is provided on the inner tank 1 on the side, conversely, the flange 12a and the flange 13 of the fastening screw rod 12 are welded and fixed to the inner tank 1 on the cryogenic temperature side, and the supporting portion 3 is fixed to the inner tank 1. The same can be applied to a structure in which a beam (not shown) fixed in the outer tub 2 is provided instead of 1.

Further, although the upper and lower cylinder groups 4A and 4B each have a triple tube structure, other supporting cylinders may be added to the upper and lower cylinder groups 4A and 4B to form a multiplex structure such as a quintuple tube structure. Further, even when the heat shield plate has a structure of a plurality of layers such as a temperature level of 80K and a temperature level of 20K, the same effect can be expected by forming the intermediate support cylinders for taking the respective heat anchors in the same structure as described above.

〔The invention's effect〕

Since the present invention has been made as described above, the thermal contact between the metal intermediate supporting cylinders of both cylinder groups in the multiple cylinder sandwiching supporting system is sufficient, and the same temperature level can always be reached with each other. Even if no cooling pipe is attached, both heat anchors can be reliably taken on only one side. Therefore, because the cooling pipe on one side is unnecessary, the overall structure of the superconducting magnet can be simplified and the weight and size can be reduced, and in particular, the distance between the superconducting coil in the inner tank and the ground coil can be greatly reduced. Then, the required magnetomotive force of the superconducting coil can be reduced, the size and weight of the superconducting magnet as a whole can be reduced, and power saving can be expected.

Furthermore, since the cooling pipe on one side can be eliminated, the number of pipe connections inside the outer tank, which may cause a vacuum leak accident, is reduced, so that the reliability can be improved and the superconducting magnet can be easily manufactured. In addition, the inner tank supporting device for the superconducting magnet is very effective in that the assembly time and the test time can be greatly shortened.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view of a spring ring used in the embodiment, and FIGS. 3 to 5 are perspective views showing various different modifications of the spring ring.
FIG. 6 is a sectional view of a main part showing another embodiment of the present invention,
7 and 8 are perspective views showing different modified examples of the taper ring of FIG. 6, FIG. 9 is a sectional view of a main portion showing still another embodiment of the present invention, and FIG. 10 is a conventional example. FIG. 1 ... inner tank, 2 ... outer tank, 2A, 2B ... outer tank upper and lower plates,
3 ... Support seat, 4A, 4B ... Cylindrical group, 5A, 5B, 7
A, 7B ... Support cylinder, 6A, 6B, 6C, 6D ... Intermediate support cylinder, 8a, 8b, 9a, 9b, 9c, 9d ...
Collar part, 10a, 10b, 10c, 10d ... Fitting part, 1
1A, 11B ... Spacer and support seat, 12 ... Fastening screw rod, 12a, 13 ... Flange, 14A, 14B ... Heat shield plate, 15A, 15B ... Cooling pipe, 16,18
... Grooves, 17, 17A, 17B, 17C ... Spring rings, 19, 19A, 19B ... Tapered rings, 17
a, 19a ... slit, 17b, 19b ... notch, 1
7c ... Spring thin plate, 17c '... Coating with good thermal conductivity.

Claims (3)

[Claims] 1. A pair of cylinders each having a multi-tube structure in which a plurality of supporting cylinders are successively engaged in an outer tank, which is a vacuum container, in which an inner tank containing a superconducting coil and cooled to a cryogenic temperature is housed. In the inner tank supporting device of the superconducting magnet sandwiched and supported by
A structure in which the mutual fitting portions of the metal intermediate supporting cylinders of the two cylinder groups are provided with a spring ring or a taper ring that presses against each other so that they are in sufficient thermal contact with each other to keep the temperatures at the same level. An inner tank supporting device for a superconducting magnet, characterized in that 2. The inner tank supporting device for a superconducting magnet according to claim 1, wherein the spring ring or the taper ring is coated with a film made of a material having good thermal conductivity. 3. A pair of cylinders each having a multi-tube structure in which an inner tank containing a superconducting coil and cooled to a cryogenic temperature is successively engaged with a plurality of supporting cylinders in an outer tank which is a vacuum container. In the inner tank supporting device of the superconducting magnet sandwiched and supported by
The mutual fitting portions of the respective metal intermediate support cylinders of the above-mentioned cylinder group are made of materials having different heat shrinkage rates from each other so that they are always in close contact with each other, so that they are sufficiently in thermal contact with each other to keep the temperature of both. An inner tank supporting device for a superconducting magnet, which is configured to have the same level.