Gas dynamic and static pressure mixed thrust protection bearing for electromagnetic bearing system

Abstract

The invention relates to the technical field of electromagnetic bearings and particularly discloses a gas dynamic and static pressure mixed thrust protection bearing for electromagnetic bearing system. The protection bearing includes a gas static pressure thrust bearing, a gas dynamic pressure thrust bearing and a gas supply system. The gas static pressure thrust bearing and the gas dynamic pressure thrust bearing both generate axial forces, the direction of the resultant force of the axial forces is opposite to the direction of the force to be born, and the gas supply system provides high pressure gas to the gas static pressure thrust bearing. The inventive gas dynamic and static pressure mixed thrust protection bearing is simple in structure and easy to process and operate, can provide sufficient rigidity to support the rotor during idle rotation after the rotor drops, reduces contact and wear of the main shaft thrust disc and the protection bearing, reduces the negative influences of vibration and impact accompanied by rotor drop, prolongs the service life of the protection bearing, and improves reliability of the electromagnetic bearing system.

Description

technical field [0001] The invention relates to the technical field of electromagnetic bearings, in particular to a gas dynamic and static pressure hybrid thrust protection bearing used in an electromagnetic bearing system. Background technique [0002] Electromagnetic bearing systems generally include protective bearings (also known as "auxiliary bearings", "emergency bearings", and "backup bearings"), whose function is to temporarily support the high-speed rotating rotor in the axial and radial directions when the electromagnetic bearing fails, thereby Protect the electromagnetic bearing unit from damage. Therefore, protecting the performance and reliability of bearings is very important to users of rotating machinery. [0003] High-temperature gas-cooled reactor is an advanced nuclear reactor with good inherent safety, high power generation efficiency and extremely wide range of uses, with graphite as moderator and helium as coolant. The purpose of Huaneng Shandong Shid...

AI Technical Summary

Problems solved by technology

The HTR-PM main helium blower is a vertical single-stage centrifugal compressor, the operating medium is helium, and no oil or impurities can be introduced into the primary circuit of the reactor, which also means that the bearings used cannot be lubricated

For the HTR-PM main helium blower, if the protection bearing adopts the structure of the traditional sliding bearing or rolling bearing, when the electromagnetic bearing fails, due to the absence of any lubrication, dry friction occurs between the dropped rotor and the protection bearing, and the friction caused by high speed Large, or even "spot welding", will cause damage to the protective bearing and even the electromagnetic bearing

At this point, the reliability of the protective bearing after a limited number of drops will become very small

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