JPS6261809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a rotor of a superconducting rotating machine. As a conventional rotor of this type, there is one shown in FIG. 1 is a torque tube, 2 is a coil mounting shaft that forms the center part of the torque tube 1, 3 is a superconducting field coil fixed to the coil mounting shaft 2, and 4 is a room temperature coil surrounding the torque tube 1 and the coil mounting shaft 2. A damper 5 is a low temperature damper disposed between the normal temperature damper 4 and the coil mounting shaft 2, 6 and 7 are a helium outer cylinder and a helium end plate attached to the outer circumference and side surface of the coil mounting shaft 2, respectively. , 8 and 9 are drive side and non-drive side end shafts, 10 is a bearing that pivotally supports these end shafts 8 and 9, 11 is a slip ring for supplying field current, and 12 is formed in the torque tube 1. Alternatively, the arranged heat exchanger, 13, is a side radiation shield. Further, 14 is a vacuum section, and 15 is a liquid helium reservoir section.

In the rotor of the superconducting rotating machine having the above configuration, the superconducting field coil 3 disposed on the coil mounting shaft 2 is cooled to an extremely low temperature to bring the electrical resistance to zero and eliminate excitation loss. A strong magnetic field is generated in this superconducting field coil 3,
AC power is generated in a stator (not shown). In order to cool and maintain this superconducting field coil 3 at an extremely low temperature, liquid helium is introduced from the center of the non-drive side end shaft 9 through an introduction pipe (not shown), and is then passed through a helium outer cylinder 6 and a helium end plate 7. While supplying liquid helium to the formed liquid helium container, the inside of the rotor is vacuumed to the vacuum section 1.
The torque tube 1 that transmits rotational torque to the cryogenic superconducting field coil 3 and the coil mounting shaft 2 is made of a thin-walled cylinder, and a heat exchanger 12 is provided to maintain a high vacuum through the torque tube 1. The most common structure is to minimize the amount of heat that enters the area. Further, side radiation shields 13 are provided to reduce heat entering due to radiation from the sides.

On the other hand, the normal temperature damper 4 and the low temperature damper 5 shield the harmonic magnetic field from the stator, and the superconducting field coil 3
It has the function of protecting the rotor and damping rotor vibrations caused by disturbances in the power system, while the room temperature damper 4 functions as a vacuum outer cylinder, and the low temperature damper functions as a radiation shield for the helium container. Common.

In this figure, the piping constituting the helium introduction and discharge system inside the rotor and the helium introduction and discharge device connected to the rotor are omitted. The structure of the rotor of a conventional superconducting rotating machine is as described above, so pure material is used as the material for the end shaft.
If a material that is prone to seizure, such as Ti or Ti alloy, is used, the bearing has the disadvantage of seizure.

This invention was made in order to eliminate the drawbacks of the conventional products as described above.
In addition, by fitting the sleeve in such a way that both ends of the shaft are separated from the bearing of the rotor shaft, fretting at the interface between the sleeve and the end shaft can be avoided. The object of the present invention is to provide a rotor for a superconducting rotating machine that can prevent seizure of a bearing part.

An embodiment of the present invention will be described below with reference to the drawings. In Fig. 2, 10 is a bearing, 16 is pure Ti,
The end shaft 17 is made of a material that is prone to seizure, such as a Ti alloy, and the sleeve 17 is a sleeve that is made of a material that does not easily cause seizure, and is fitted onto the end shaft 16 by shrink fitting or press fitting.

According to the present invention, the sleeve 17 made of a material such as alloy steel that does not easily cause seizure is fitted to the portion of the end shaft 16 supported by the bearing 10, so that the sleeve 17 is made of a material that does not easily cause seizure. The surface of the end shaft 16 does not come into direct contact with the bearing 10, and it is possible to provide a rotor for a superconducting rotating machine in which seizure of the bearing portion is prevented.

In the above embodiment, a cylindrical sleeve is used, but in order to prevent fretting from occurring at the interface between the sleeve 17 and the end shaft 16, a sleeve having a shape as shown in FIG. 3, for example, may be used. Alternatively, for example, as shown in FIG. 4, the end shaft 16 may be grooved to reduce stress concentration. In this way, by taking measures to prevent fretting at the interface between the sleeve 17 and the end shaft 16 by reducing stress concentration, etc., it is possible to improve the reliability of the mounting shaft 16 without losing the effects of the present invention. Can be done.

In the above embodiment, the sleeve material is made of a material other than the easily seized material used for the end shaft 16, but porous holes are formed by powder metallurgy using the same type of material as the end shaft 16. The same anti-seizure effect can be obtained by making a high quality sleeve and impregnating it with oil.

As described above, according to the present invention, the bearing part of the end shaft made of a material that is prone to seizure is made of alloy steel or the like that does not easily cause seizure, and both ends in the axial direction are separated from the end shaft. Since the configured sleeves are fitted together, it is possible to prevent seizure of the bearing part in an inexpensive manner without causing fretting at the interface, providing a highly reliable rotor for superconducting rotating machines at a low cost. can do.

[Brief explanation of the drawing]

Fig. 1 is a clear view of the structure of a rotor of a conventional superconducting rotating machine, and Fig. 2 is an explanatory diagram of an embodiment of the present invention, in which Fig. 2a is a longitudinal sectional view and Fig. 2b is a horizontal sectional view. , 3rd
4 are explanatory diagrams of other embodiments of the present invention. In the figure, 1 is a torque tube, 2 is a coil mounting shaft, 3 is a superconducting field coil, 4 is a normal temperature damper, 5 is a low temperature damper, 6 is a helium outer cylinder, 7 is a helium end plate, 8 is a drive side end shaft , 9 is the non-drive side end shaft, 10 is the bearing, 11 is the slip ring, 1
2 is a heat exchanger, 13 is a side radiation shield, 14 is a vacuum section, 15 is a liquid reservoir section, 16 is an end shaft, 17 is a sleeve, 18 is a sleeve that reduces stress concentration,
19 is a groove. Note that the same reference numerals in the same figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1. The shaft material is made of a material that is prone to seizure, such as pure titanium or titanium alloy. The bearing part of the rotor shaft is made of alloy steel, etc., which does not easily cause seizure, and both ends in the axial direction are separated from the bearing part of the rotor shaft. The rotor of a superconducting rotating machine is constructed by fitting sleeves, etc.