JPS5937331A - Thrust bearing device - Google Patents

Abstract

PURPOSE:To provide an economical thrust bearing device by furnishing a fixed panel with fix gap from the lower face of a rotating panel for providing magnetic repulsion type permanent magnets respectively on facing sides of these panels. CONSTITUTION:A fixed panel 7 supported by a base 6 is provided below a rotating panel 4 with a fixed gap from the lower face of the rotating panel 4, and strong magnetic repulsion type permanent magnets 8 and 9 such as rare earth cobalt permanent magnets are oppositely furnished on opposing faces of the fixed panel 7 and the 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 the magnetic attraction of a magnetic bearing 5 and the magnetic repulsion of the 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 of permanent magnets 8 and 9.

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 it and the bottom surface of the thrust runner (2) is Supports the thrust load of the rotating shaft (1).

(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 (1).

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).

However, in the conventional device described above, since the magnetic bearing (5) is composed of an electromagnet, a large amount of electric power and a power supply device 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 has been made in view of the above-mentioned drawbacks of the conventional ones.A fixed plate is disposed below the rotating plate with a predetermined gap between it and the lower surface of the rotating plate. The object of the present invention is to provide an economical thrust bearing device by arranging magnetically repulsive permanent magnets at opposing positions on opposing surfaces.

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 below the rotary plate (4) with a predetermined gap from the lower 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 (sl
, (o), the thrust load of the rotating shaft (1) is supported by the strong magnetic repulsion generated between the rotation shaft (1).

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) and the permanent magnets (81, (9).
) is supported by magnetic repulsion.

In this way, magnetic repulsion type permanent magnets (81, (9) are arranged in opposing positions on the opposing surfaces of the rotating plate (4) and the fixed plate (7) below the rotating plate (4), respectively. - The power required for the electromagnet of the magnetic bearing (5) can be reduced by the amount of the permanent magnets (+1) and (9), and the power supply device thereof can also be made smaller.

This invention is based on the above-described system, in which a fixed plate is disposed below the rotary plate with a predetermined gap from the lower surface of the rotary plate, and magnetic repulsion type permanent magnets are placed at opposite positions on opposing surfaces of the fixed plate and the rotary 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 a rotating shaft, (4) is a rotating plate, and (7) is a rotating shaft.
is a fixed plate, (8) and (9) are permanent magnets.
The same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 1 Figure 2 1

Claims (2)

[Claims] (1) A rotating plate provided on the rotating shaft, a fixed plate disposed below the rotating plate with a predetermined gap from the lower 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 by being equipped with a magnetic repulsion 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.