Touchdown bearing with self-centering function for vertical magnetic bearing rack

Abstract

The invention discloses a touchdown bearing system device with a self-centering function for a vertical magnetic suspension bearing rack. The touchdown bearing system device with the self-centering function for the vertical magnetic suspension bearing rack comprises a bearing outer ring, a rolling body, a retainer, a bearing inner ring and a paired shaft sleeve, wherein the touchdown bearing needs to bear axial load and radial load at the same time; the bearing inner ring and the paired shaft sleeve are provided with a pair of conical surfaces which can be completely attached; the bearing system is in a static state when a rotor rotates in a suspended mode, and a certain gap exists among the rotor, the shaft sleeve and the bearing inner ring; when the suspension rotor falls, the rotor and the shaft sleeve are in contact with the touchdown bearing inner ring, and the bearing is accelerated to the rotating speed of the rotor; and in the axial direction, the shaft sleeve and the bearing inner ring are tightly attached due to the gravity effect, and the self-centering function is formed on the rotor due to the conical surfaces, so that the radial collision force of the rotor and the bearing inner ring is effectively reduced, and the service life of the touchdown bearing is prolonged.

Description

Technical field: [0001] The invention relates to the technical field of a magnetic suspension bearing system, in particular to a bearing device for protecting a vertical magnetic suspension rotor from falling. Background technique [0002] In the magnetic suspension bearing system, once the magnetic suspension bearing fails, the rotor will fall from the suspension state at high speed, so a set of protective bearings (Touchdown Bearings) are needed to catch the rotor to avoid collision damage between the rotor and the stator, and ensure the safety of the entire magnetic bearing system sex and reliability. For the vertical magnetic levitation rotor falling, the high-speed rotating rotor first contacts the axial end face of the protective bearing in the axial direction due to gravity, and at the same time, due to the existence of eccentricity, the rotor radially contacts and collides with the inner ring under centrifugal action, and in the gap Bounce and all-around friction oc...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of insufficient reliability of the prior art mentioned above, the present invention proposes a protective bearing with self-centering function for the vertical magnetic bearing stand, which reduces the rotor whirl response, collision contact force and frictional heating, Effectively improve the life of the protected bearing

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