Structure for protecting bearing adopting bidirectional spiral grooves

Abstract

The invention discloses a structure for protecting a bearing adopting bidirectional spiral grooves. The structure comprises a radial protection sleeve and an axial protection baffle, wherein the radial protection sleeve sleeves a rotor needing to be protected and is eccentrically arranged with the rotor, the axial protection baffle closes to one end face of the rotor but does not in contact with the end face, the end face, close to the rotor, of the axial protection baffle is provided with a plurality of spiral grooves which are wide in exteriors and thin in interiors, opened in outer ends andclosed in inner ends, and a plurality of spiral grooves which have the same width and are in one-to-one symmetry are formed in the inner wall of the radial protection sleeve from the two ends towardsthe middle; air passages leading to the spiral grooves in the axial protection baffle and the spiral grooves in the radial protection sleeve are arranged on the axial protection baffle and the radialprotection sleeve correspondingly; and when the rotor rotates at a high speed, a radial dynamic pressure gas film can be formed between the inner wall of the radial protection sleeve and the outer surface of the rotor and an axial dynamic pressure gas film can be formed between the axial protection baffle and the rotor end face close to the axial protection baffle. According to the structure, theburden on the magnetic suspension bearing can be reduced, and the function of protecting the bearing can be borne when the magnetic suspension bearing loses efficacy.

Description

technical field [0001] The invention relates to the field of high-speed rotating machines, in particular to a protective bearing structure for magnetic suspension high-speed rotating machines. Background technique [0002] Compressors, blowers, turbo dryers, large energy-saving water pumps, high-efficiency energy-saving heat pumps, energy storage flywheels, gas turbines, centrifugal central air-conditioning units and other large-scale high-speed rotating machinery are widely used in various sectors of the national economy, and are all related industries. The core key equipment is also a high-energy-consuming equipment. [0003] Magnetic suspension bearing is a new type of support that uses electromagnetic force to levitate the rotor without mechanical contact. Compared with traditional bearings (rolling bearings and oil sliding bearings), magnetic suspension bearings have no mechanical contact with the rotor, have a long service life, low maintenance costs, no lubrication a...

AI Technical Summary

Problems solved by technology

The dynamic pressure gas bearing does not require an external air source, and only produces a supporting effect under the action of fluid dynamics. It has the advantage of simple structure, but it has high requirements for manufacturing and processing, and there is direct contact friction with the rotor during the start and stop stages

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