JPS6327874B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for an inner tank in a superconducting electromagnet used in a superconducting magnetically levitated vehicle or the like.

Superconducting magnetically levitated vehicles are currently being developed as a future means of transportation. The superconducting electromagnet used for this has a structure in which an outer tank, which is a vacuum container, supports a roughly elliptical ring-shaped inner tank that houses a superconducting coil, and the inner tank is kept at an extremely low temperature with liquid helium inside. Moreover, it is also affected by the large electrode force that causes the vehicle to levitate and propel itself. For this reason, it is necessary to provide thermal insulation between the outer tank and the inner tank, and it is also necessary to connect them with a strong support structure that can receive strong forces.

In other words, improving the thermal insulation between the outer tank and the inner tank is directly related to the consumption of internal liquid helium, and it is very important to somehow reduce the consumption of expensive liquid helium. Furthermore, if this consumption is reduced, the capacity of the re-liquefaction refrigerator for liquid helium, if mounted on the vehicle, can be reduced, which is an extremely important matter for reducing the overall weight of the vehicle.

However, as mentioned above, the inner tank needs to be strongly connected and supported to the outer tank, and for this reason, when the outer tank and the inner tank are connected with a thick support structure, the thick support structure is thermally insulated. This naturally leads to an increase in the consumption of liquid helium, resulting in a result that is mutually inconsistent with the above-mentioned requirements.

Furthermore, since the inner tank of a superconducting electromagnet inevitably pulsates due to the levitation repulsive force coming from the ground and the thrust of the linear motor for vehicle propulsion, there is a risk of damage to the supporting structure due to resonance etc. unless it is supported with extremely high rigidity. At the same time, the outer tank, which is a vacuum container, is at approximately atmospheric temperature, while the inner tank is at an extremely low temperature of 4 to 5 degrees, which causes large thermal contraction, resulting in high rigidity as mentioned above. Extremely contradictory requirements arise with respect to the requirements to be supported by a supporting structure.

Therefore, supporting the inner tank with respect to the outer tank in a superconducting electromagnet as described above is a contradiction in that the inner tank must be supported with high rigidity while having thermal insulation properties and allowing thermal contraction of the inner tank. There were many demands, and it was extremely difficult to meet them.

In order to satisfy the above-mentioned requirements, the inner tank support structure of the superconducting electromagnet of the present invention is a multilayer structure having high rigidity in the compression direction and thermal insulation properties, in which a plurality of tubes with different diameters are arranged inside and outside in order and connected one after another. A plurality of support columns of the intermediate ring sandwiching type multi-tube system, in which tubes are provided on both sides of the intermediate ring so as to sandwich the ring, are arranged in groups facing in three directions, up and down, left and right, and front and rear. The plurality of support columns connect the intermediate ring to the inner tank side member and both ends to the outer tank side member, and the remaining support columns connect the intermediate ring to the outer tank side member and both ends to the inner tank side member. By coupling, the inner tank is supported within the outer tank with high heat insulation and rigidity while allowing shrinkage due to extremely low temperatures.

An embodiment of the present invention will be described below with reference to the drawings.

First, in Fig. 1, numeral 1 in the figure is an outer tank which is a vacuum container, and there are upper and lower, left and right, and front and rear wall members 1a, 1.
b and 1c form a hollow box shape. 2 is an inner tank housed in the outer tank 1, and has inner and outer peripheral wall members 2.
A, 2b and the front and rear wall members 2c form a racetrack shape, that is, a substantially elliptical annular shape, and a superconducting coil (not shown) is housed inside over the entire circumference.

In addition, in order to prevent deformation due to strong internal electromagnetic force that occurs when the internal superconducting coil is energized, the inner tank 2 is provided between the upper and lower parts of the inner circumferential wall member 2a, which have a long linear distance, in the longitudinal direction (horizontal direction in the drawing). ) are reinforced by welding and fixing three longitudinal beam members 3a, 3b, and 3c, such as H-section steel, at intervals. The intermediate longitudinal beam member 3b is provided with its web surface facing in the left-right direction, and the longitudinal beam members 3a and 3c near both left and right ends are provided with their web surfaces facing in the front-rear direction.

On the other hand, four horizontal beam members 4 made of strip steel are fixed by welding at their front and rear ends so as to be horizontally suspended between the front and rear wall members (front side not shown) 1c of the outer tank 1.
A, 4b, 4c, 4d and two horizontal beam members 5a, 5b such as H-shaped steel are arranged. Note that the four horizontal beam members 4a, 4b, 4c, and 4d are the second
The books are arranged vertically in parallel to each other so as to cross the left and right space of the intermediate longitudinal beam member 3b on the inner periphery of the inner tank 2, and the two horizontal beam members 5a and 5b are arranged one by one in the inner tank 1. Curved parts at both left and right ends of and left and right longitudinal beam members 3
It is arranged in mutual space with a and 3c.

Here, a large number of support columns 6A, 6B, 6 are used to support the inner tank 2 with respect to the outer tank 1.
C, 6D, 6E, 6F, 6G, and 6H are arranged.

Each of these support columns 6A to 6H will later be replaced by a second support column.
As will be explained in detail with reference to the drawings, they all have the same configuration and are of the intermediate ring sandwich type multi-tube type, and a plurality of tubes are arranged in three directions, up and down, left and right, and front and back.

That is, first, the first two support columns 6A, 6
B is disposed so as to pass through the web of the inner tank side intermediate longitudinal beam member 3b in the left-right direction through holes formed near the upper and lower ends thereof, and each of the intermediate rings 17, which will be described later, It is connected to the web of the inner tank side intermediate longitudinal beam member 3b, and both ends of each are connected to the outer tank side horizontal beam members 4a, 4b and 4c, 4d.

In addition, the following four support columns 6C, 6D and 6
E and 6F are arranged such that two of them each penetrate the webs of the inner tank side left and right vertical beam members 3a and 3c in the front and rear direction through holes formed near the upper and lower ends thereof, respectively. Each intermediate ring 17 is connected to the webs of the left and right vertical beam members 3a, 3c on the inner tank side, and both ends (front and rear ends) of each are fixed to the front and rear wall members 1c on the outer tank side.

Further, the remaining two support cams 6G and 6H are arranged so as to pass through the webs of the outer tank side left and right cross beam members 5a and 5b in the vertical direction through holes formed in the middle thereof, respectively. and each intermediate ring 17 is connected to the outer tank side left and right cross beam members 5a, 5.
b, and both ends (upper and lower ends) of each are fixed to the upper and lower surfaces of the inner peripheral wall member 2a on the inner tank side.

FIG. 2 is an enlarged sectional view taken along the line - in FIG.
The configuration of one of them, 6A, is shown as a representative.
The structure of this support column 6A itself is the same as that of the other support columns 6B to 6H, but the mounting positions and orientations are different for each of the columns as described above. However, in FIG. 2 of the lever, there are the outer tank side horizontal beam members 4a and 4b at both left and right ends, and the inner tank side vertical beam member 3b of the H-beam steel is located in the middle, and a hole 3b' is formed in this web. . On the other hand, the support column 6A of the intermediate ring sandwiching type multi-tube system is, as its name suggests, a ring 17 interposed in the middle in the longitudinal direction, and the multi-tubes are arranged in such a manner that the ring 17 is sandwiched from both sides. In this case, the intermediate ring 17 is connected to the inner tank side longitudinal beam member 3.
It is fitted into the hole 3b' of the web of b and is connected by welding or the like, and the left and right multiple pipe ends are connected to the outer tank side cross beam member 4.
It is connected to a and 4b by welding or the like.

More specifically, as shown in the figure, there is a flange 1 at the left end.
There is a long central shaft 11 having a flange 1a, and a relatively short hollow shaft 12 having a flange 12a at the right end opposite to this. Extended male threaded shaft portion 11b
A hollow shaft 12 is fitted into and connected by a nut 13. Such a central shaft 11 and hollow shaft 1
2, these left and right flanges 11a, 12
Fit and engage each outer end to the inner surface of a.
A pair of left and right inner tubes 14a, 14b made of FRP pipes or the like with high compressive strength and good thermal insulation are installed, and on the outer periphery of these left and right inner tubes 14a, 14b, a stainless steel pipe of a larger diameter with a tensile strength or the like is installed. A pair of tall left and right folded tubes 15a and 15b are attached by fitting and engaging the inner end flanges of each to the inner ends of the left and right inner tubes 14a and 14b, and furthermore, the left and right folded tubes 1
A pair of left and right outer pipes 16a, 1, such as FRP pipes, which have a larger diameter than the inner pipes 5a, 15b, are arranged on the outer peripheries of the pipes 5a, 15b.
6b connects each outer end to the left and right folded tubes 15a, 15
(b) is fitted and engaged with the outer end flange, and the intermediate ring 17 is fitted and fitted between the inner ends of the left and right outer tubes 16a, 16b. And this middle ring 17
As mentioned above, the hole 3 in the web of the inner tank side vertical beam member 3b
b' and are connected by welding etc., the left end flange 11a is connected to the outer tank side cross beam member 4a by welding etc., and the right end flange 12a is connected by welding etc. via the washer 18 which escapes the nut 13. ing. Note that such a multi-tube structure can be constructed by increasing the number of tubes, but in practice, the number of tube turns should be appropriately selected in relation to the required thermal insulation and restrictions on rigidity, strength, weight, etc. .

In the case of such a support column 6A of the multi-tube type with an intermediate ring inserted, initial pressure is applied in the axial direction by tightening the nut 13, so even if the temperature drops in some parts, play will occur between the tubes. In addition, since each tube is subjected to simple compression and tension in response to axial force, it has fairly high rigidity, and in the direction perpendicular to the axis, especially FRP Inner and outer tubes 14a, 14 such as manufactured pipes
Due to shearing and bending deformation of b, 16a, and 16c,
The rigidity is considerably lower than that in the axial direction. For this purpose, the outer tank 1, which is a vacuum container as described above, and the inner tank 2, which is cooled to a cryogenic temperature, are connected and supported with high heat insulation and rigidity while avoiding heat shrinkage of the inner tank 2. This is extremely convenient.

According to the structure described above, the inner tank 2 has a pair of left and right support columns 6G, 6H in the vertical direction.
The left and right longitudinal directions are a pair of upper and lower support columns 6A,
6B, the front and back directions are supported by a pair of upper and lower support columns 6C, 6D, 6E, and 6F on the left and right sides. The inner tank 2 is now supported in adiabatic manner. In this way, even against the respective rotational forces around the three-direction axes, the support is supported in the direction of high rigidity of at least two support columns, so that reliable support can be obtained. Moreover, since the lateral rigidity of each support column arranged on the left and right sides is relatively low, the inner tank 2
The inner tank can be supported very rationally while avoiding heat shrinkage.

In addition, by restraining and supporting the inner tank 2 in the longitudinal direction (horizontal direction in the figure) with a support column at the longitudinally intermediate portion, it is possible to minimize the amount of lateral deformation of the support columns on the other left and right portions. This is an ideal arrangement.

As described above, the inner tank support structure of the superconducting electromagnet of the present invention consists of a plurality of tubes with different diameters arranged inside and outside in order, and a multi-tube having high rigidity in the compression direction and thermal insulation properties connected one after another. A plurality of support columns of the intermediate ring sandwiching type multi-pipe type are provided on both sides of the ring so as to sandwich the ring, and are arranged facing in three directions, up and down, left and right, and front and back, and are connected to the outer tank side member and the inner tank side member. When the inner tank is connected to the tank side member, the inner tank can be supported within the outer tank in a very rational manner with high heat insulation properties and rigidity while allowing shrinkage due to cryogenic temperatures.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view taken along the line - in FIG. 1...Outer tank which is a vacuum container, 1a, 1b, 1
c, 4a, 4b, 4c, 4d, 5a, 5b...outer tank side member (1a, 1b, 1c...wall member, 4a to 5b...beam member), 2...inner tank, 2a, 2b,
2c, 3a, 3b, 3c... Inner tank side member (2a,
2b, 2c... wall member, 3a, 3b, 3c... beam member), 6A, 6B, 6C, 6D, 6E, 6F,
6G, 6H...Support column, 11...Central axis, 1
1a...Flange, 11b...Shaft portion, 12...Hollow shaft, 12a...Flange, 13...Nut, 1
4a, 14b, 16a, 16b...inner and outer pipes such as FRP pipes, 15a, 15b...folded pipes,
17...Ring, 18...Washer.

Claims (1)

[Claims] 1. In the inner tank support structure of a superconducting electromagnet, which supports a roughly elliptical annular inner tank containing a superconducting coil in an outer tank that is a vacuum container, multiple tubes with different diameters are arranged inside and outside in order and connected one after another. A support column of the intermediate ring sandwiching type multi-tube system, in which multiple tubes with high rigidity and thermal insulation properties are provided on both sides of the intermediate ring and has high thermal insulation properties in the direction of compression, is installed vertically, horizontally, front and rear. A plurality of support columns connect the intermediate ring to the inner tank side member and connect both ends to the outer tank side member, and the remaining support columns connect the intermediate ring to the outer tank side member. It is characterized by a structure in which the inner tank is supported within the outer tank with high heat insulation and rigidity while allowing shrinkage due to cryogenic temperatures by joining to the side member and connecting both ends to the inner tank side member. Inner tank support structure in superconducting electromagnet.