Miniature turbine generator

Abstract

The invention discloses a miniature turbine generator which comprises a turbine, a cooling fan, a motor, two radial bearings and a thrust bearing. The radial bearings are hybrid radial hydrodynamic gas-lubricated bearings, and the thrust bearing is a hybrid thrust hydrodynamic gas-lubricated bearing. The middle part of an inner shaft is sleeved with a rotor, the two radial bearings are arranged on the parts, located at the left and right ends of the rotor, of an outer shaft in a sleeving mode correspondingly, and the thrust bearing is arranged on the part, located at the right end, of the outer shaft in a sleeving mode and located at the outer end of the radial bearing at the right end. The turbine and the cooling fan are arranged at the two ends of the inner shaft correspondingly. The miniature turbine generator can stably operate at an ultrahigh speed in a gas-floating state, and for meeting the same power requirement, the size of the turbine generator can be obviously reduced to achieve miniaturization.

Description

technical field [0001] The invention relates to a small and micro turbine generator, which belongs to the technical field of high-precision machinery. Background technique [0002] In recent years, with the development of distributed power supply and multi-electric technology, the power system has gradually replaced the mechanical systems such as hydraulic pressure and air pressure in traditional aircraft, so that the secondary side power system is distributed in the form of electricity. Electric aircraft has become a new development direction of the times. The power system with small and micro turbine generators as the main body will become an important research direction for the power system of the new generation of multi-electric aircraft. [0003] Due to the limit speed of the traditional oil-based bearing, when the shaft speed exceeds the limit speed, the bearing will fail, so it can no longer meet the requirements of small and micro turbine generators. The air bearin...

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Problems solved by technology

[0003] Due to the limit speed of traditional oil-based bearings, when the shaft speed exceeds the limit speed, the bearing will fail, so it can no longer meet the requirements of small and micro turbine generators

The air bearing has gradually become a hot spot in the industry and academia because of its advantages such as small friction loss, good high temperature stability, high reliability, low vibration, no need for lubricating oil, and no restriction on the size of the rotating shaft. : Chinese patent application CN201310703932.8 discloses an exhaust gas turbine generator, which adopts 2 radial air foil bearings and 1 air foil thrust bearing to overcome the defect that traditional bearings are prone to failure when working at high speed and high temperature. It has the advantages of small friction loss, can work in high temperature environment, and high efficiency of waste gas energy recovery. However, because foil bearings generally use metal foil, there are not only some difficulties in material manufacturing technology and processing technology, but also the damping of the bearing. The value cannot be greatly increased, resulting in insufficient rigidity of the bearing, low critical speed of the bearing, easy instability or even jamming at high-speed operation, poor stability of high-speed operation, and limited increase in speed, which limits industrial applications

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