JPS5937330A - Thrust bearing device - Google Patents

Abstract

PURPOSE:To obtain an economical thrust bearing device without the necessity of a large power unit by providing a fixed panel above a rotating panel with a fixed gap from the upper face of the rotating panel for furnishing magnetic attraction type permanent magnets respectively at opposing spots on the facing sides of the fixed panel and the rotating panel. CONSTITUTION:A fixed panel 7 supported by a base 6 is provided above a rotating panel 4 with a fixed gap from the upper face of the rotating panel 4. Strong magnetic attraction magnets 8 and 9, for instance, rare earth cobalt permanent magnets, are arranged at opposing spots respectively on facing sides of this fixed panel 7 and a rotating panel 4. The thrust load of a shaft 1 works as an arrow A shows. A part of the thrust load is supported by an oil film bearing 3, while the rest is supported by magnetic attractions of a magnetic bearing 5 and permanent magnets 8 and 9. This construction permits to reduce the required power necessary for an electromagnet of the magnetic bearing 5 by the portion for permanent magnets 8 and 9 to minimize its power source unit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thrust bearing device that supports the thrust load of a rotating shaft using, for example, an oil film bearing and a magnetic bearing.

A conventional device of this type is shown in FIG. In the figure, (1) is, for example, the rotating shaft of a chamber shaft type rotating electric machine, (
2) is a thrust runner provided on this rotating shaft (1);
(3) is an oil film bearing disposed below this thrust runner (2), and the oil film formed between the bottom surface of the thrust runner (2) and the rotating shaft (1) Supports the thrust load.

(4) is a rotating plate provided on the rotating shaft (1), and (5) is a magnetic bearing configured by an electromagnet that is arranged above the rotating plate (4) and supported by the foundation (6). Ashi, rotating plate (
4) to support the thrust load of the rotating shaft (]).

The thrust load of the 0-rotation shaft (1), whose operation will be explained next, acts as shown by arrow A. A part of the thrust load is supported by the oil film bearing (3), and the remaining thrust load is supported by the magnetic attraction force of the magnetic bearing (5).

However, in the conventional device described above, since the magnetic bearing (5) is composed of an electromagnet, a large amount of electric power and power supply are required to attract the rotating plate (4) and support the thrust load of the rotating shaft (1). There were drawbacks such as:

This invention was made in view of the drawbacks of the conventional ones as described above, and includes a fixed plate disposed above the rotating plate with a predetermined gap from the upper surface of the rotating plate, and a fixed plate and a rotating plate facing each other. The object of the present invention is to provide an economical thrust bearing device by arranging magnetic attraction type permanent magnets at opposing positions.

Hereinafter, one embodiment of the present invention will be described based on FIG. 2. In the figure, (1) to 6) are similar to the configuration of the conventional device described above. (7) is arranged above the rotary plate (4) with a predetermined gap from the upper surface of the rotary plate (4),
The fixed plates (81 and (9) supported by the foundation (6) are strong magnets, such as rare earth cobalt permanent magnets, which are placed at opposing positions on the opposing surfaces of the fixed plate (7) and rotating plate (4), respectively. This permanent magnet (81,
The rotating shaft (
1) Thrust load is supported.

Next, the operation will be explained. The thrust load on the rotating shaft (1) acts as shown by arrow A. A part of the thrust load is supported by the oil film bearing (3), and the remaining thrust load is supported by the magnetic attraction force of the magnetic bearing (5) and the permanent magnet (81, (0)
) is supported by magnetic attraction.

In this way, the magnetic attraction type permanent magnets (a+, (9) are arranged at opposing positions on the opposing surfaces of the rotating plate (4) and the fixed plate (7) above the rotating plate (4), respectively. , magnetic bearing (5) for the permanent magnets (8) and (9).
The power required for the electromagnet can be reduced, and its power supply can also be made smaller.

This invention is based on the above-described system, in which a fixed plate is disposed above the rotating plate with a predetermined gap from the upper surface of the rotating plate, and magnetic attraction type permanent magnets are placed at opposing positions on opposing surfaces of the fixed plate and the rotating plate. By arranging this, an economical thrust bearing device can be obtained.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view showing a conventional thrust bearing device, Figure 2
The figure is a longitudinal sectional view showing a thrust bearing device according to an embodiment of the present invention. In the figure, (1) is the rotating shaft, (4) is the rotating plate, and (7) is the rotating shaft.
is a fixed plate, and (81, (9) are permanent magnets. In addition, the same reference numerals in the figures indicate the same or monk parts. Agent: Makoto Kuzuno - Figure 1 ↓ Figure 2

Claims (2)

[Claims] (1) A rotating plate provided on the rotating shaft, a fixed plate disposed above the rotating plate with a predetermined gap from the upper surface of the rotating plate, and positions facing each other on opposing surfaces of the fixed plate and the rotating plate. A thrust bearing device characterized in that it is equipped with a magnetic attraction type permanent magnet arranged in a. (2) The thrust bearing device according to claim 1, wherein the permanent magnet is a rare earth cobalt permanent magnet.