Thrust bearing, rotor system and control method of thrust bearing

Abstract

The invention provides a thrust bearing, a rotor system and a control method of the thrust bearing. The thrust bearing comprises a thrust disc, firsts stators and second stators, wherein the thrust disc is fixedly connected to a rotating shaft, the first stators and the second stators are arranged on the rotating shaft in a penetrating mode, and the first stators and the second stators are arranged on the two opposite sides of the thrust disc; each stator comprises a magnetic bearing and a foil bearing, a plurality of first magnetic parts are arranged on the magnetic bearings in the circumferential direction, and second magnetic parts are arranged on the foil bearings; and the foil bearings are arranged between the magnetic bearings and the thrust disc, bearing gaps are formed between thefoil bearings and the thrust disc, and the foil bearings can move in the axial direction of the rotating shaft under the action of magnetic force. According to the thrust bearing, the bearing gaps andthe magnetic bearings are arranged in the thrust bearing, so that the thrust bearing forms a gas and magnetic hybrid thrust bearing, and the dynamic performance and the stability of the thrust bearing under a high-speed running state can be improved due to the fact that gas bearings and the magnetic bearings can work cooperatively.

Description

technical field [0001] The invention relates to the technical field of bearings, in particular to a thrust bearing, a rotor system and a control method for the thrust bearing. Background technique [0002] A gas turbine mainly includes three major components: a compressor, a combustor, and a turbine. After the air enters the compressor, it is compressed into high-temperature and high-pressure air, and then supplied to the combustion chamber for mixed combustion with fuel, and the high-temperature and high-pressure gas generated expands in the turbine to perform work. When the rotor rotates at high speed, the rotor will be subjected to force in the axial direction. In order to limit the axial movement of the rotating shaft, thrust bearings need to be installed in the rotor system. Traditional thrust bearings are common contact bearings. As the rotor speed increases, especially when the rotor speed exceeds 40,000 revolutions per minute, ordinary contact bearings can no longe...

AI Technical Summary

Problems solved by technology

However, when the magnetic bearing is turned on for a long time, there are problems such as excessive energy consumption and heat generation; while the air bearing will generate shock waves when the surface linear velocity is close to or exceeds the speed of sound, which will lead to bearing instability and even catastrophic consequences such as shaft collision

It can be seen that the above two non-contact bearings are not suitable for high-speed gas turbines or gas turbine-generator combined units.

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