JPH05944B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a superconducting rotor, and particularly to a superconducting rotor equipped with an abnormal evaporative gas exhaust device when a large amount of evaporative gas of liquid helium is generated. It is.

[Background of the invention]

The superconducting rotor has a superconducting field winding wound with superconducting wire, and has a special structure equipped with a refrigerant storage tank that cools the superconducting field winding. It is necessary to understand the physical characteristics of the system, and studies are currently underway.

1 and 2 show conventional examples of superconducting rotors. As shown in the figure, a rotating body 1 of a superconducting rotor includes a torque tube 4 having a refrigerant storage tank 2 attached to its inner diameter and a superconducting field winding 3 attached to its outer periphery, and the superconducting field winding 3. It consists of a vessel 5 mounted on the upper part of the vessel 5, and an outer damper 7 disposed on the outer periphery of the vessel 5 via a vacuum insulation part 6.

A single-stage rotation shaft (load-side rotation shaft) 9 is fixed to the rotor 1 configured in this manner via a single-stage journal bearing 8 on the load side, and a torque tube 4 is connected to the torque tube 4 via a connecting pipe 10 on the opposite load side. A two-stage rotation shaft (anti-load side rotation shaft) 12 is fixed, which is composed of a hollow rotation shaft 11 connected to the outer damper 7 and an outer hollow rotation shaft 11a directly connected to the outer damper 7.

And the above-mentioned torque tube 4 and outer damper 7
The vacuum sealing of the vacuum insulation section 6 provided between the metal bellows 1 and
The vacuum adjustment of the vacuum heat insulating section 6 sealed by the vacuum valve 3 is performed by a vacuum valve 14 on the side of the rotating body 1 on the general rotating shaft 9 side. Further, an excitation slip ring 16 is disposed on the hollow rotating shaft 11 connected to the connecting pipe 10 via a mica insulator 15.
A fixed-side helium supply/discharge device 17 is provided at the axial end of the superconducting field winding 3 to supply liquid helium for cooling the superconducting field winding 3 and to recover evaporated gas from the cooling or stored liquid helium. . Inside the hollow rotating shaft 11, there is also a helium transfer pipe 19 that transfers liquid helium from a helium supply pipe 18 to the refrigerant storage tank 2, and a spiral duct 2 of a jacket 20 that transports the evaporated gas of the liquid helium injected into the refrigerant storage tank 2.
A spiral recovery pipe 22 and the like are disposed through the pipe 1. In addition, as a countermeasure in case a large amount of evaporative gas from the liquid helium stored in the refrigerant storage tank 2 suddenly occurs, an abnormal evaporative gas exhaust device is provided. It consists of a safety valve 24 buried in the inner diameter of the gas discharge port 23 and a gas discharge port 25 connected to the safety valve 24. When the pressure of evaporated gas exceeds a certain pressure, the gas is It is designed to be released directly outside the aircraft. In the figure, 26 indicates the helium supply/discharge device 17 connected to the hollow rotating shaft 1.
Bearing attached to 1, 27 is hollow rotating shaft 11
Magnetic fluid seals 28a and 28b provide a gas seal between the helium supply and discharge device 17, and are general recovery ports.

In order for the superconducting rotor configured in this way to exhibit its performance as a superconducting rotor, it is necessary to sufficiently cool the superconducting field winding 3 attached to the torque tube 4 with liquid helium. ,
When the superconducting field winding 3 is sufficiently cooled, that is, cooled down to around 4.2K where it can exhibit good performance, the power lead 2 is removed from the excitation slip ring 16.
9, the superconducting intervening magnetic winding 3 is excited. In this manner, in the superconducting rotor, it is necessary to cool the superconducting field winding 3 to about 4.2 K with liquid helium, and during this time the pre-bell operation is carried out for a long time from the start to the completion of the pre-bell. Therefore, the liquid helium stored in the refrigerant storage tank 2 is constantly released as evaporative gas, but this released evaporative gas is continuously recovered from the helium supply/discharge device 17 to a recovery system (not shown). Other than this, a large amount of abnormal evaporative gas generated when the superconducting field winding 3 is quenched and abnormal evaporative gas generated during the initial injection of liquid helium are discharged by an abnormal evaporative gas exhaust device. That is, the refrigerant is temporarily discharged from the safety valve 24 provided at the gas discharge port 25 of the intermediate shaft 23 until the internal pressure of the refrigerant storage tank 2 decreases.

By the way, if gas is suddenly discharged from one of the long-axis rotating bodies during rotation, abnormal vibrations may occur in the hollow rotating shaft 11 to which the helium supply/discharge device 17 is attached, or the hollow rotating shaft 11 may The gas passage to the helium supply/discharge device 17 also has the drawback of being subjected to a large amount of discharge pressure. To solve this problem, conventionally, since it is impossible to adjust the discharge pressure of the safety valve 24 during operation, an on-off valve 30 has been installed so that a large amount of helium can be recovered from the general recovery ports 28a and 28b of the helium supply/discharge device 17. The safety valve 24 was provided and adjusted to avoid gas discharge due to the operation of the safety valve 24 as much as possible. However, when the superconducting field winding 3 quinches, a very large amount of liquid helium evaporates at once, so the operation of the safety valve 24 is not only unavoidable;
When a large amount of extremely low-temperature helium is recovered from the helium supply/discharge device 17 for a long period of time, the connecting pipe 1 forming a spiral duct 21 that becomes part of the gas recovery system.
There is a limit to the ability to recover a large amount of gas from the spiral recovery pipe 22 side, which is the normal gas recovery system route, due to problems such as plastic deformation of materials related to the 0 and jacket 20, damage to the magnetic fluid seal 27, and thermal shrinkage of peripheral connecting members. It was hot.

[Purpose of the invention]

The present invention has been made in view of the above points,
It is an object of the present invention to provide a superconducting rotor that makes it possible to discharge abnormal evaporated gas without adversely affecting the spiral recovery tube side.

[Summary of the invention]

That is, the present invention includes a hollow rotating shaft connected to the anti-load side of a torque tube equipped with superconducting field windings and a refrigerant storage tank through a connecting pipe in which a spiral duct is installed, and a hollow rotating shaft provided inside the hollow rotating shaft. , and a liquid helium supply pipe for injecting liquid helium to cool the superconducting field windings, a liquid helium transfer pipe, a spiral recovery pipe for collecting evaporated gas of liquid helium, and provided at the axial end of the hollow rotating shaft. In addition, there is a fixed side helium supply/discharge device that supplies liquid helium to the liquid helium supply pipe and discharges evaporated gas from the spiral recovery pipe, and a fixed side helium supply/discharge device that supplies liquid helium to the liquid helium supply pipe and discharges evaporated gas from the spiral recovery pipe. In a superconducting rotor having an abnormal evaporative gas evacuation device, the abnormal evaporative gas evacuation device is arranged in a hollow rotating shaft in parallel with a spiral recovery pipe, and a direct recovery pipe connected to a refrigerant storage tank; It is characterized by a freely adjustable emergency safety valve installed outside the helium supply/discharge device so as to communicate directly with the recovery pipe.This allows for abnormalities to be detected directly from the recovery pipe while adjusting the emergency safety valve. Evaporated gas can be exhausted.

[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. 3-5. 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, the abnormal evaporative gas exhaust device is provided with a direct recovery pipe 31 which is disposed inside the hollow rotating shaft 11 in parallel with the spiral recovery pipe 22 and connected to the refrigerant storage tank 2, and a helium gas discharge device so as to communicate with the direct recovery pipe 31. It is formed by an adjustable emergency safety valve 32 provided outside the supply/discharge device 17. By doing so, abnormal evaporative gas can be discharged while adjusting the emergency safety valve 32, and a superconducting rotor can be obtained in which abnormal evaporative gas can be discharged without adversely affecting the spiral recovery pipe 22 side. be able to.

In other words, the general recovery port 2 of the helium supply/discharge device 17
A direct recovery pipe 31 is provided in parallel with the spiral recovery pipe 22 leading to 8b for emergency release of abnormal evaporated gas, and an emergency recovery port 3 communicates with the end of the direct recovery pipe 31.
3 was provided inside the helium supply/discharge device 17, and an emergency recovery pipe 34 communicating with the emergency recovery port 33 and an emergency safety valve 32 connected to the emergency recovery pipe 34 were provided outside the helium supply/discharge device 17. and direct collection pipe 3
1, a gas pit 36 was provided in which a convection prevention plate 35 was inscribed to prevent heat from entering into the spiral recovery tube 22 side due to convection. In the figure, 37 is a gas passage branch provided between the spiral recovery pipe 22 and the direct recovery pipe 31, and 38 is a direct gas passage branch provided between the end of the direct recovery pipe 31 and the emergency recovery port 33. This is the collection port. By doing this, a large amount of abnormal evaporated gas generated when the superconducting field winding 3 is quenched or when liquid helium is initially injected can be collected directly through the recovery pipe 31, the direct recovery port 38, and the emergency recovery by adjusting the emergency safety valve 32. port 33, emergency recovery pipe 34 and emergency safety valve 3
2, it is impossible to adjust the discharge pressure of the safety valve 24 of the abnormal evaporative gas discharge device as in the past, and a part of the abnormal evaporative gas is transferred from the spiral recovery pipe 22 to the general recovery port 28a, 28b, no abnormal pressure is applied to the spiral recovery pipe 22, and therefore there is no fear of damage to the magnetic fluid seal 27. Deformation can be prevented. Further, since the abnormal evaporative gas is discharged from the same direction as the normal evaporative gas recovery direction, it is possible to prevent abnormal vibration of the hollow rotating shaft 11 from occurring.

Another embodiment of the invention is shown in FIG. In this embodiment, the direct recovery tube 31a is replaced by the liquid helium transfer tube 19 and the liquid helium transfer tube 1.
9 and the direct recovery pipe 31a. and spiral duct 21
A refrigerant storage tank 2 is installed on the inner diameter of the jacket 20 provided with
A recovery tube collecting pit 41 is provided in which the holed recovery pipes 40 provided with gas discharge ports are collected, and from this recovery pipe collecting pit 41 the direct recovery port 3 of the hollow rotating shaft 11 is connected.
8 is transferred by a triple pipe 42 that integrates the direct recovery pipe 31a, vacuum insulation pipe 39, and liquid helium transfer pipe 19, and the helium supply/discharge device 17 installed from the solid side has multiple An axial emergency recovery hole 43 and a collecting gas pit 44 are provided, and the emergency safety valve 32 is disposed in the axial direction of the helium supply/discharge device 17 via the collecting gas pit 44. In the figure, 45 is a refrigerant supply pipe, and 46 is a refrigerant supply vacuum insulation part for preventing heat from entering from the outside atmosphere or from around the polymerization gas pit 44 during refrigerant supply. In this case, the emergency safety valve 32 is provided outside the helium supply/discharge device 17 in the axial direction so that the abnormal evaporative gas is discharged from the axial direction, so that the abnormal evaporative gas can be discharged more easily than in the case described above. I can do it.

〔Effect of the invention〕

As described above, in the present invention, abnormal evaporated gas can be directly discharged from the collection pipe while adjusting the emergency safety valve, and there is no need to discharge a large amount of evaporated gas from the spiral collection pipe as in the past. Therefore, it is possible to obtain a superconducting rotor that allows abnormal evaporative gas to be discharged without adversely affecting the spiral recovery tube side.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of a conventional superconducting rotor, FIG. 2 is a sectional view taken along the - line in FIG. 4 is a sectional view taken along the - line in FIG. 3, FIG. 5 is a sectional view taken along the - line in FIG. 3, and FIG. 6 is a counterload of another embodiment of the superconducting rotor of the present invention. FIG. 2... Refrigerant storage tank, 3... Superconducting field winding, 4...
... Torque tube, 10 ... Connection pipe, 11 ... Hollow rotating shaft, 17 ... Helium supply and discharge device, 18 ... Liquid helium supply pipe, 19 ... Liquid helium transfer pipe, 21 ... Spiral duct, 22 ... Spiral recovery pipe, 31, 31a...Direct recovery pipe, 32...Emergency safety valve, 33...Emergency recovery port, 38...Direct recovery port, 39...Vacuum insulation pipe, 42...Triple pipe, 43
...Axial emergency recovery hole.

Claims (1)

[Scope of Claims] 1. A hollow rotating shaft connected to the anti-load side of a torque tube equipped with a superconducting field winding and a refrigerant storage tank via a connecting pipe with a spiral duct inside, and the inside of this hollow rotating shaft. a liquid helium supply pipe for injecting liquid helium to cool the superconducting field windings, a liquid helium transfer pipe, a spiral collection pipe for collecting evaporated gas of the liquid helium, and an axis of the hollow rotating shaft. a fixed-side helium supply/discharge device that is provided at the end of the direction and supplies the liquid helium to the liquid helium supply pipe and discharges the evaporative gas from the spiral recovery pipe; and a large amount of the evaporative gas is generated. In the superconducting rotor, the superconducting rotor has an abnormal evaporative gas evacuation device that discharges a large amount of abnormal evaporative gas when , and a superconducting rotor formed of a direct recovery pipe connected to the refrigerant storage tank, and an adjustable emergency safety valve provided outside the helium supply/discharge device so as to communicate with the direct recovery pipe. . 2. The superconducting rotor according to claim 1, wherein the direct recovery tube is formed by providing a gas pit with a convection prevention plate installed between it and the spiral recovery tube. 3. The method according to claim 1, wherein the direct recovery tube is formed integrally with the liquid helium transfer tube and a vacuum insulation tube provided between the liquid helium transfer tube and the direct recovery tube. Superconducting rotor.