JPS60223464A - Superconductive rotor - Google Patents

Abstract

PURPOSE:To prevent a thermal stretchable unit from twisting by providing a slide coupling shaft capable of transmitting a torque in a gap between a low temperature cylindrical shaft and a normal temperature cylindrical shaft. CONSTITUTION:A superconductive field winding 2 is provided in a rotor 1, and supported to a torque tube 3. A liquid helium storage tank 4 is disposed at the inner periphery, a low temperature cylinder 5 to become a helium vessel wall is disposed on the outer periphery of the winding 2, and a normal cylinder 7 is provided through a vacuum heat adiabatic layer 6. The cylinder 7 is supported to a normal temperature cylindrical shaft 10. The layer 6 is sealed in vacuum by a thermal stretchable unit 12 of metal bellows. Thus, a slide coupling shaft 21 capable of transmitting a torque in a rotating direction slidably in an axial direction is provided in an atmospheric unit 20 of a gap between a low temperature cylindrical shaft 9 and the shaft 10 to transmit the torque to prevent the unit 12 from twisting, thereby eliminating the twisting action applied to the shaft 10.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a superconducting rotor.

[Background of the invention]

Superconducting rotating machines differ from conventional rotating electric machines in that inside the rotor there is a superconducting field winding wound with superconducting wire that has zero electrical resistance when cooled with liquid helium, and its inner diameter There is a refrigerant storage tank that stores liquid helium to cool the superconducting field windings.

A low-temperature cylinder and a room-temperature cylinder, which serve as helium containers, are arranged around the outer periphery of the superconducting field winding, and the gap between the low-temperature cylinder and the room-temperature cylinder has a special structure that forms a vacuum insulation layer. . It is necessary to simplify such a complex structure, analyze the mechanical and thermal stress of the structural elements, understand the electrical characteristics, etc., and development is currently underway.

1 and 2 show conventional examples of superconducting rotors. As shown in the figure, a superconducting field winding 2 is disposed inside the rotating body 1, and a torque tube 3 supports it. A liquid helium storage tank 4, which is a refrigerant storage tank, is disposed on the inner circumference of the torque tube 3 and stores liquid helium.

A low-temperature cylindrical body 5 serving as a helium container wall is disposed on the outer periphery of the superconducting field winding 2 supported by the torque tube 3.
A room temperature cylindrical body 7 is disposed thereon with a vacuum heat insulating layer 6 interposed therebetween.

One end of the low-temperature cylindrical body 5 and the normal-temperature cylindrical body 7 is supported by an integral rotating shaft 8 that is integrally fixed with the torque tube 3.
The low temperature cylindrical body 5 at the other end is supported by a low temperature cylindrical shaft 9, and the normal temperature cylindrical body 7 is supported by a normal temperature cylindrical shaft 10.
is attached to the cold cylindrical body 5 with the fixing bolt 11a, and the normal temperature cylindrical shaft 1o
is fixed to the normal temperature cylindrical body 7 with a fixing bolt 11b.

Vacuum sealing of the vacuum insulation layer 6 is performed by a thermally expandable body 12 made of a metal bellows, and the degree of vacuum of the vacuum insulation layer 6 is adjusted by a vacuum pulp 13 provided on an integral rotating shaft 8.

Further, torque transmission from the low-temperature cylindrical body 5 having the superconducting field winding 2 inside to the normal-temperature cylindrical body 7 is performed by disposing a plurality of torque transmission keys 14 between the normal-temperature cylindrical shaft 10 and the low-temperature cylindrical shaft 9. However, this torque transmission key 14 is prevented from popping out by a key support plate 15. Further, the power lead 16 of the superconducting field winding 2, the recovery tube 17 for recovering the evaporated gas of liquid helium, etc. are arranged in the inner diameter cavity 18 of the low temperature cylindrical shaft 9, and the liquid helium storage tank 4 is located at the center of the inner diameter.
Helium injection guide tube 19 for injecting and guiding liquid helium into
is located.

In the superconducting rotor constructed in this manner, the superconducting field winding 2 is cooled to an extremely low temperature close to 4.2 ℃ with liquid helium in order to achieve a superconducting state during operation. On the other hand, the room-temperature cylinder 7 is at room temperature, but the low-temperature cylinder 5 is cooled to an intermediate temperature of 50 to 100 degrees. For this reason, the integral rotating shaft 8, low temperature cylindrical shaft 9, etc. connected to the low temperature cylinder 5 are exposed to a continuous temperature distribution from near the extremely low temperature of 4.2 to room temperature.

In this way, there is a large temperature difference between the room-temperature cylinder 7 and the torque tube 3 during operation, but since they are all assembled at room temperature, the temperature difference between the room-temperature cylinder 7 and the torque tube 3 during operation is equal to the amount of heat shrinkage. Differences in axial length occur. In this case, assuming that the length of the torque tube 3 is, for example, 6 m, the difference in axial length between the torque tube 3 and the room-temperature cylindrical body 7 is about 15 m.

The material of this torque tube 3 is SUS 304 or 5U.
Stainless steel such as 8316, titanium alloy, etc. are used, but if each joint is rigidly connected, thermal stress exceeding the elastic limit will occur, so countermeasures are required.In contrast, conventional spring structures and slide mechanisms are known. However, all of these structures are effective as simple expansion and contraction structures that can absorb thermal stress, but they also maintain vacuum and transmit torque from the torque tube 3 side to the room temperature cylinder 7 side at the same time as the expansion and contraction action that is a necessary condition. is still insufficient.

The conventional example shown in FIGS. 1 and 2 mentioned above has been studied as a practical structure to solve this problem. As is clear from the figure, this is done in consideration of heat conduction from the low-temperature cylinder 5 and torque tube 3 side to the integral rotating shaft 8 and low-temperature cylinder shaft 9, and between the low-temperature cylinder shaft 9 and the normal-temperature cylinder 7. It has a structure having a vacuum heat insulating layer 6 and an atmospheric pressure section 20 in which a thermally expandable body 12 of metal bellows is arranged. In order to transmit torque from the torque tube 3 side to the room temperature cylindrical body 7, a torque transmission key is provided between the outer peripheral surface of the low temperature cylindrical shaft 9 directly connected to the torque tube 3 and the inner peripheral surface of the room temperature cylindrical shaft 10, as described above. 14 is the provision. The conventional superconducting rotor has a double telescoping structure in which the thermal expansion/contraction/torque transmission and the expandable vacuum sealing part are separated. Even with the separated structure, it is difficult to manufacture and process, and it is difficult to remove the torsion effect applied to the heat-expandable body 12, so that results that fully satisfy the requirements cannot be obtained.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object of the present invention is to provide a superconducting rotor that can prevent twisting of a thermally expandable body.

[Summary of the invention]

That is, the present invention provides a torque tube having a refrigerant storage tank in its inner diameter, a superconducting field winding disposed on the outer periphery of the torque tube, a low-temperature cylindrical body disposed on the outer periphery of the superconducting field winding, and a normal temperature cylinder provided on the outer periphery of the low temperature cylinder through a vacuum insulation layer, the low temperature cylinder having one side connected to a low temperature cylinder shaft, and the normal temperature cylinder having one side connected to the normal temperature cylinder. The low-temperature cylindrical shaft and the normal-temperature cylindrical shaft are coupled at their axial ends with a torque transmission key, and the vacuum insulation layer is provided between the low-temperature cylindrical shaft and the normal-temperature cylindrical body. In a superconducting rotor provided with a thermally expandable body for holding, a sliding member is provided in a gap between the low-temperature cylindrical shaft and the normal-temperature cylindrical shaft, and is slidable in the axial direction and capable of transmitting torque in the rotational direction. It is characterized by the provision of a joint shaft, which allows torque to be transmitted through the sliding joint shaft.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. An embodiment of the present invention is shown in FIGS. 3 and 4. Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, a low temperature cylindrical shaft 9 and a normal temperature cylindrical shaft 10 are used.
A sliding joint shaft 21 that can slide in the axial direction and transmit torque in the rotational direction into the atmospheric pressure part 20 that is the gap between the
has been established. By doing so, it is possible to obtain a superconducting rotor in which torque can be transmitted through the sliding joint shaft 21 and the thermally expandable body 12 can be prevented from being twisted.

That is, the sliding joint shaft 21 is connected to a spline shaft 23 provided with a spline 22, a cylindrical fitting portion 24, and a torque transmission hole 2.
A thrust joint shaft 2 composed of a transmission shaft 26 etc. with a
1a. By doing so, the torsional action of the torque transmission stopper applied to the room-temperature cylindrical shaft 10 from the torque transmission key 14 to the thermally expandable body 12 holding the vacuum insulation layer 6 can be suppressed by the thrust formed by the spline shaft 23 and the transmission shaft 26. Since the torque can be transmitted by the joint shaft 21a, it becomes possible to eliminate the twisting action on the room temperature cylindrical shaft 10, and it is possible to prevent twisting on the thermally expandable body 12.

Then, this thrust joint shaft 21a is connected to a spline shaft 23,
Since it is composed of fitting parts such as the transmission shaft 26, it not only requires single-piece machining without the need for heat-processing and mounting each part, but it is also suitable for work with precise tolerances, so small tolerances can be achieved. In addition, the thrust joint shaft 21M can be easily attached and assembled to the side of the heat-expandable body 12, and the thrust joint shaft 21a can transmit torque with a small clearance. It is possible to prevent repeated stress during manufacturing and mechanical stress during manufacturing and assembly work. In the same figure, 27 is a shaft mounting guide ring for mounting the spline shaft 23 on the low-temperature cylindrical shaft 9, and 28 is a transmission shaft fixing guide for fixing the transmission shaft 26 (9) in place, which connects the normal-temperature cylindrical shaft 10 to the normal-temperature cylindrical body 7. Before fixing, the shaft mounting guide link 27 and the transmission shaft fixing guide 28 are connected to the low temperature cylindrical shaft 9 and the normal temperature cylindrical body 7.
By fixing them to the transmission shaft 26 and the spline shaft 2, respectively,
3 can be easily assembled. After this assembly, the torque transmission mechanism can be easily assembled with precise tolerances by attaching the room temperature cylindrical shaft 10 and pushing in the torque transmission key 14, which serves both to prevent end eccentricity and to transmit torque. part is obtained.

Another embodiment of the invention is shown in FIGS. 5 and 6. In this embodiment, the sliding joint shaft 21 is a cylinder joint shaft 2 having a plurality of thrust holes 29 and thrust protrusions 30.
1b. By doing this, the cylinder joint shaft 21b can transmit torque better than in the case described above, and it is possible to better prevent twisting of the thermally expandable body 12.

That is, the cylinder joint shaft 21b is connected to the plurality of thrust holes 29.
It is constructed by combining a thrust transmission shaft 31 provided with a thrust transmission shaft 31 and a thrust shaft 32 having a plurality of thrust projections 30. In the figure, 33 is the thrust transmission shaft 3.
1, 34 is a fixing hole to which the fixing protrusion 33 is attached, 35 is an oil suction fan hole for sucking lubricating oil from the journal bearing 37 into the thrust joint 36 and the thermal expansion/contraction body 12, and 38 is an oil suction fan hole. Thrust for adjusting the thrust of the thrust projection 30)
The N-node spring 39 is a lubricating oil injection hole. This configuration not only simplifies the structure and makes it easier to achieve precision tolerances in machining, but also allows the thrust joint 36, which absorbs thermal stress and transmits torque of the low-temperature cylindrical shaft 9, and thermal expansion/contraction. Thrust friction loss in the vicinity of the body 12 can be reduced, and a thrust joint, that is, a sliding joint shaft 21, with better torque transmission can be constructed.

In each of the above-mentioned embodiments, the sliding joint shaft 21 is replaced by the low-temperature cylindrical shaft 9.
Although the thermo-expandable body 12 and the sliding joint shaft 21 are provided between the rotary shaft 10 and the room-temperature cylindrical shaft 10, the heat-expandable body 12 and the sliding joint shaft 21 may be provided on the integral rotating shaft 8 side. In addition to the spline 22 and cylinder coupling, for example, a double cylindrical coupling with a key arrangement, which is a simple double cylindrical coupling having an inner circumferential surface and an outer circumferential surface without any thrust holes 29, thrust protrusions 30, etc. can do.

[Effects of the Invention] As described above, according to the present invention, it is possible to obtain a superconducting rotor in which twisting is not applied to the thermally extensible body, thereby making it possible to prevent twisting from being applied to the thermally extensible body.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a conventional superconducting rotor, FIG. 2 is a longitudinal sectional side view of the main part of the superconducting rotor showing the thermal stress absorption and coupling portion of FIG. 1, and FIG. 3 is a superconducting rotor of the present invention. A longitudinal cross-sectional side view around the sliding joint shaft of one embodiment, FIG. 4 is I- in FIG. 3.
5 is a sectional view taken along line I, FIG.
It is a cross-sectional view taken along the line ■-n in the figure. DESCRIPTION OF SYMBOLS 1... Rotating body, 2... Superconducting field winding, 3... Torque tube, 4... Refrigerant storage tank, 5... Low temperature cylinder, 6... Vacuum insulation layer, 7...・Room temperature cylindrical body, 9...
Low temperature cylindrical shaft, (12) 10... Room temperature cylindrical shaft, 12... Heat stretchable body, 14...
・Torque transmission key, 20...Atmospheric pressure part (gap part), 2
1... Sliding joint shaft, 21a... Thrust joint shaft, 2
1b... Cylinder joint shaft, 22... Spline, 2
3... Spline shaft, 24... Cylindrical fitting part, 25
...Torque transmission hole, 26...Transmission shaft, 27...Shaft mounting guide ring, 28...Transmission shaft fixing guide, 29
...Thrust hole, 30...Thrust protrusion, 31...
・Thrust transmission shaft, 32... Thrust shaft, 33...
Fixed protrusion, 34...Fixing hole, 35...Oil suction fan hole, 36...Thrust connection agent Patent attorney Hiroo Nagasaki (and 1 other person) (13) Kaya #2 Koka 3 eyes tea 4 - Japanese Patent Application Publication Sho GO-2234G4 (5) Kaya 5 Eyes Fig. 6

Claims (1)

[Claims] 1. A torque tube having a refrigerant storage tank in its inner diameter, a superconducting field winding arranged on the outer periphery of this torque tube, and a low-temperature coil arranged on the outer periphery of this superconducting field winding. A cylindrical body, and a normal temperature cylindrical body provided on the outer periphery of the low temperature cylindrical body via a vacuum insulation layer, one side of the low temperature cylindrical body being coupled to a low temperature cylindrical shaft; The cold cylindrical shaft and the cold cylindrical shaft are connected at their axial ends with a torque transmission key, and the cold cylindrical shaft and the normal temperature cylindrical body are connected at the same time. In a superconducting rotor that is provided with a thermally expandable body that holds a vacuum heat insulating layer, a rotor that is slidable in the axial direction and that transmits torque in the rotational direction is installed in the gap between the low temperature cylindrical shaft and the normal temperature cylindrical shaft. A superconducting rotor characterized by having a slidable joint shaft. 2. The superconducting rotor according to claim 1, wherein the sliding joint shaft is formed of a thrust joint shaft having a plurality of torque transmission holes and a cylindrical fitting portion. 3. The superconducting rotor according to claim 1, wherein the sliding joint shaft is formed of a cylinder joint shaft having a plurality of thrust holes and thrust projections.