JPH0456547B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a superconducting rotor (hereinafter referred to as a rotor)
In particular, the present invention relates to a rotor in which the vacuum of a vacuum insulation part is sealed with a metal bellows.

Since the rotor is a rotating cryostat, a vacuum section is provided inside for insulation.
After the assembly of the rotor is completed, this vacuum section is depressurized, and treatments such as sealing off are performed. Liquid helium is then injected into the refrigerant tank provided in the torque tube.

Conventional examples of such rotors are shown in FIGS. 1 to 3. A superconducting field winding (hereinafter referred to as a field winding) 1 is firmly attached to a torque tube 2 and is located in a winding space 4 surrounded by a helium container wall 3, and liquid helium 6 in a helium tank 5. is cooled by flowing through a helium flow hole 7 provided in the torque tube 2. This liquid helium 6 is supplied via a helium supply/discharge device 8 from a fixed helium tank (not shown) outside the machine to a helium supply pipe 9 connected to the torque tube 2 as shown by the arrow in the figure. It is sent to the helium tank 5 through the inside of the shaft 10. on the other hand,
The evaporated helium gas cools a power lead (not shown) serving as a power input line from the torque tube 2 and the field winding 1 through which the field current is passed, and is then discharged to the outside of the machine through the helium supply/discharge device 8. Further, a field current to the field winding 1 is supplied from an external fixed power source via a slip ring 11.

Inside the rotor, which has become complicated in this way, the helium tank 5 installed in the torque tube 2
The outside of the winding space 4 and the winding space 4 are surrounded by an outer cylinder 13 with a vacuum insulation part 12 interposed therebetween. The outer cylinder 13 is a sealed container that tightly separates the vacuum insulation section 12 inside the outer cylinder from the outside. At the same time, since it acts as an electric damper shield, large accidental torque and electromagnetic pressure act on the outer cylinder 13. Further, the drive side (load side) of this outer cylinder 13 includes a rotating shaft 14 fixed integrally with the torque tube 2 and a pedestal 15 having a first stage bearing.
The anti-drive side (anti-load side) is supported by bolt 1.
6, it is connected and fixed to the outer cylinder joint shaft 17. The jar bearing 18a provided on the outer cylinder joint shaft 17 and the journal bearing 18b provided on the joint shaft 10 are supported by a single two-stage bearing pedestal 19, and the connection of the joint shaft 10 to the torque tube 2 is performed at high speed. vacuum bolt 20
The outer cylinder joint shaft 17 and the joint shaft 10 are fixed by a key 21 so that the torque transmission between the joint shaft 17 and the joint shaft 10 is accurately transmitted.

The torque tube 2 of the rotor configured in this manner is exposed to an extremely low temperature of 4.2 K because liquid helium 6 is stored in the helium tank 5 inside the torque tube 2, and contracts in the axial direction. On the other hand, the outer cylinder 13 is normally kept at room temperature, and the temperature only increases to a certain extent in the event of an accident. In order to seal the vacuum heat insulating section 12 between the torque tube 2, which expands and contracts with heat, and the outer cylinder 13, which hardly experiences thermal expansion or contraction, an expandable metal bellows 22 is used. Vacuum insulation section 1 sealed with metal bellows 2
2 is depressurized and sealed off by a vacuum valve 23.

By the way, this metal bellows 22 is expensive,
Most of them are custom-ordered and require long delivery times, and not only do they require great care and precision in the installation process, but because the material is thin, even a small amount of welding sparks during construction can cause a hole to form. Therefore, when such a metal bellows 22 is welded, the total length of the welded portion must be made very long, and the possibility of vacuum leakage due to defects in the welded portion is extremely large. In addition, in FIGS. 2 and 3, 24 is an L-shaped end plate for attaching the metal bellows 22 between the outer cylinder 13 and the joint shaft 10.

The present invention has been made in view of the above points,
The purpose is to provide a superconducting field trochanter in which metal bellows can be used without welding parts.

That is, in the present invention, a metal bellows is inserted through an O-ring into a bottomed thrust groove provided on the inner diameter side of an outer cylinder and opened on the outer cylinder joint shaft side, and the inserted metal bellows is inserted from the opening side. It is characterized by being pressed and supported by a thrust plate having a T-shaped cross section and connected to the joint shaft via an O-ring.

The present invention will be described below based on illustrated embodiments. An embodiment of the invention is shown in FIGS. 4 and 5. Note that parts that are the same as those in the prior art are designated by the same reference numerals, and therefore their explanations will be omitted. In this embodiment, a metal bellows 22a is inserted into a bottomed thrust groove 25 provided on the inner diameter side of the outer cylinder 13 and opened on the outer cylinder joint shaft 17 side via O-rings 26a and 26b, and the inserted metal The bellows 22a is pressed and supported from the opening side by a thrust plate 28 having a T-shaped cross section and connected to the joint shaft 10 via an O-ring 27a. By doing this, the function of the metal bellows 22a can be well demonstrated without a welded part, and the metal bellows 22a
It is possible to obtain a superconducting rotor that can be used without welding parts.

That is, 25 is a bottomed thrust groove in which a metal bellows 22a which is opened on the side of the outer cylindrical joint shaft 17 is installed and thrusts the metal bellows 22a. Rings 29a and 29b were provided, and O-rings 26a and 26b were attached. 30 connects the T-shaped thrust plate 28 to the shaft 10.
This thrust fixing plate 30 has an O-ring groove 31 and an O-ring 31a is attached to it, and the T-shaped thrust plate 28 is connected to the thrust fixing plate 30 by narrowing this O-ring 31a. It was firmly connected with the fixing screw 32. The metal bellows 2 of the T-shaped thrust plate 28 fixed in this way
An O-ring groove 33 was provided at the contact portion with the metal bellows 22a so as not to damage the metal bellows 22a, and an O-ring 27a was attached to this O-ring groove 33. The T-shaped thrust plate 28 on the opposite side of this contact part is
A bottomed groove 34 provided in the outer cylinder joint shaft 17 so as to open opposite to the opening of the bottomed thrust groove 25.
A plate spring 36 is inserted into the bottom of the metal bellows 22a through O-rings 35a and 35b, and the metal bellows 22a is pressed and supported by a T-shaped thrust plate 28. In the figure, 37a and 37b are The O-ring 3 is provided at the inner diameter part and the outer diameter part of the bottomed groove 34.
This is an O-ring groove for inserting 5a and 35b.

Since the metal bellows 22a is pressed and supported by the T-shaped thrust plate 28 connected to the joint shaft 10 in this way, the thermal expansion and contraction of the torque tube 2 is controlled by the bottomed thrust groove 25. , O-rings 26a, 2 inside the bottomed groove 34
Metal bellows 22 through T-shaped thrust plate 28 thrusting through 6b, 35a and 35b
It is absorbed by the expansion and contraction of a, and the vacuum in the vacuum insulation section 12 is maintained well. and metal bellows 22
Since a does not use a conventional welded structure,
There is no concern about vacuum leaks due to welded parts, and since there are no welded parts, it is resistant to movement shock during assembly and operation, and can be highly reliable.

Another embodiment of the invention is shown in FIG. In this embodiment, the metal bellows 22a is inserted into the bottomed thrust groove 25 with a convex end plate 38, and is supported by the T-shaped thrust plate 28 with a concave end plate 39. That is, a sealing groove 40 into which the convex end plate 38 of the metal bellows 22a is inserted is provided at the bottom of the bottomed thrust groove 25, and O-rings 41a, 41b are installed.
A metal bellows 22a was inserted through the metal bellows 22a. Then, the T-shaped thrust plate 28 was inserted into the concave end plate 39 of the metal bellows 22a via O-rings 41c and 41d. In addition, in the same figure, 42a and 42b are O
These are O-ring grooves provided in the radial direction for inserting the rings 41a and 42b, respectively, and 42c and 42d are O-ring grooves provided in the radial direction for inserting the O-rings 41c and 41d, respectively. By doing this, the sealing between the metal bellows 22a and the T-shaped thrust plate 28 is improved, and the sealing between the T-shaped thrust plate 28 and the metal bellows 22a can be improved compared to the case described above.

FIG. 7 shows yet another embodiment of the invention. In this embodiment, a metal bellows 22a is provided in a bottomed thrust groove 25 with O-rings 43a and 4 provided on the inner diameter side and the outer diameter side of the bottomed thrust groove 25, respectively.
3b, 43c and 43d, and was supported by the convex end plate 44 of the T-shaped thrust plate 28. In addition, in the same figure, 45a, 45
b is an O-ring groove provided in the end plate 46 of the metal bellows 22a and into which the O-rings 43a and 43c are inserted;
provided on the convex end plate 44 of a, and the O-ring 43b,
This is an O-ring groove for inserting 43d, and 47
a, 47b are convex end plates 44 of the metal bellows 22a.
Attach the convex portion of the O-ring 48 to the T-shaped thrust plate 28.
a, 48b for insertion through the convex end plate 4
This is an O-ring groove provided in the radial direction of the concave portion of the T-shaped thrust plate 28 that fits into the convex portion of No. 4. In this case as well, the same effects as in the above case can be achieved.

As described above, in the present invention, the metal bellows inserted into the bottomed thrust groove is pressed and supported by the T-shaped thrust plate connected to the joint shaft, so the metal bellows expands and contracts in response to the thermal expansion and contraction of the torque tube. As a result, the function of the metal bellows can be effectively exhibited without a welded part, and a superconducting rotor can be obtained in which the metal bellows can be used without a welded part.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of a conventional superconducting rotor, Figure 2 is a vertical side view of the metal bellows surrounding the conventional superconducting rotor, and Figure 3 is a partial vertical perspective view of the metal bellows of a conventional superconducting rotor. 4 is a vertical cross-sectional side view of a metal bellows surround of an embodiment of the superconducting rotor of the present invention, FIG. 5 is a partially vertical perspective view of a metal bellows surround of an embodiment, and FIG. A partially vertical perspective view of a metal bellows surround of another embodiment of the superconducting rotor of the present invention, FIG. 7 is a partially vertical perspective view of a metal bellows surround of still another embodiment of the superconducting rotor of the present invention It is. 1...Superconducting field winding, 2...Torque tube, 1
0...Joint shaft, 12...Vacuum insulation part, 13...Outer cylinder, 14...Rotating shaft (load side), 17...Outer cylinder joint shaft, 22a...Metal bellows, 25...Bottomed thrust groove, 26a, 26b, 27a... O-ring, 2
8...T-shaped thrust plate, 34...bottomed groove, 35a,
35b...O ring, 38...Convex end plate, 39...Concave end plate, 41a, 41b, 41c, 41d, 43
a, 43b, 43c, 43d...O ring, 44...
Convex end plate, 48a, 48b...O ring.

Claims (1)

[Claims] 1. Rotating shafts on the load side and anti-load side, a torque tube supported between these rotating shafts, a superconducting field winding provided on the torque tube, and a superconducting field winding provided on the torque tube. The magnetic winding includes a vacuum insulation part provided on the outer periphery of the magnetic winding, and an outer cylinder surrounding the vacuum insulation part and connected between the rotating shafts, and the rotating shaft on the anti-load side is connected to the torque tube. In a superconducting rotor comprising a joint shaft and an outer cylinder joint shaft connected to the outer cylinder, and the vacuum insulation part is sealed from the vacuum with a metal bellows, the metal bellows is connected to the inner diameter of the outer cylinder. The metal bellows is inserted through an O-ring into a bottomed thrust groove provided with an opening on the outer cylinder joint shaft side, and the inserted metal bellows is connected to the joint shaft from the opening side through the O-ring. A superconducting rotor characterized in that it is supported under pressure by a thrust plate having a T-shaped cross section. 2. The metal bellows is inserted into the bottomed thrust groove with a convex end plate and is supported by the T-shaped thrust plate with a concave end plate. A superconducting rotor according to scope 1. 3. The metal bellows is inserted into the bottomed thrust groove via O-rings provided on the inner and outer diameter sides thereof, and is supported by the T-shaped thrust plate with a convex end plate. A superconducting rotor according to claim 1, which is formed by: