Rotor system and micro gas turbine

Abstract

The invention provides a rotor system and a micro gas turbine. The rotor system comprises a rotating shaft. The rotating shaft is an integrated structure, the rotating shaft is horizontally or vertically arranged, and the rotating shaft is provided with a motor, a radial bearing, a gas compressor, a thrust bearing and a turbine. The radial bearing is provided with a throttling hole. The throttlinghole is a variable diameter hole. An outer wall throttling orifice of the bearing body is greater than an inner wall throttling orifice. An annular groove is arranged in an inner wall of the bearingin a circumferential direction. The inner wall throttling orifice is partially or integrally intersected with the annular groove, a first air groove is arranged in the thrust bearing, a second air groove is arranged in a circumferential surface of a position where the bearing body is correspondingly installed on the rotating shaft or in the inner wall of the bearing body along the circumferentialdirection, and the thrust bearing and the radial bearing are anti-rotating bearings. The rotor system and the micro gas turbine have an advantage of efficient and stable operation.

Description

technical field [0001] The invention relates to the technical field of rotor dynamics, in particular to a rotor system and a micro gas turbine. Background technique [0002] The micro gas turbine is a newly developed small heat engine, its stand-alone power ranges from 25 to 300kW, and its basic technical features are radial flow impeller machinery and regenerative cycle. A micro 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. In the rotor system of a micro gas turbine, radial bearings and thrust bearings need to be installed to stably support the rotating shaft in the radial and axial directions. [0003] In the rotor system of the prior art, when the radial be...

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Problems solved by technology

[0003] In the rotor system of the prior art, when the radial bearing and the thrust bearing used are air bearings, it has the following defects: for the radial air bearing, when the stiffness is not enough, it can store air through the eight-character groove, and it can be used at low speeds. Increase the bearing capacity, but it will cause air blockage at high speed. When the air is blocked, due to the high-speed rotation of the shaft, high-frequency vibration will be generated. The blocked air will become an energy absorber, and the temperature will rise rapidly, and can rise to several The high temperature of 1000 degrees will cause the shaft / sleeve to melt, the shaft and the shaft sleeve will be bonded and stuck, and at the same time, it will cause the bearing air to recharge, further blocking the air passage,

[0006] 1. Due to the throttling effect, in order to maintain a high bearing rigidity, it is necessary to reduce the aperture and air film gap of the throttle hole. The smaller aperture and gap are not only very difficult in processing and manufacturing, but also bring higher processing costs. manufacturing cost

[0007] 2. During the high-speed rotation of the bearing, with the increase of the rotor speed, the temperature inside the air film is high, and the orifice is easily oxidized in high-temperature air, resulting in black holes and blockage of air holes

[0008] The small bearing clearance is easy to cause the wear of the rotor and the stator to produce metal shavings, which will cause the blockage of the orifice and reduce the overall reliability of the bearing

[0009] 3. Air bearings are generally installed with rubber rings on the bearing seat to prevent the circumferential rotation of the shaft. However, in the actual application of radial air bearings, when the rotational speed of the rotating shaft reaches about 100,000 revolutions or more, the compressed air film and the rotating shaft The friction between them also increases, and the torque generated by this friction makes the radial air bearing rotate with the shaft more obviously and frequently, and the rubber ring is also easy to wear and damage

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