用于支撑HTR-10GT氦气轮机的磁力轴承设计研究

Study on Design of the Magnetic Bearings for Supporting a HTR-10GT Helium Turbine

介绍了10 MW高温气冷堆氦气透平发电项目(HTR-10GT)磁力轴承的设计原理及技术特点,给出了磁力轴承的详细结构设计及关键设计参数。氦气轮机转子采用立式一体化布置的结构方式,由两个径向磁力轴承和一个轴向磁力轴承支撑。轴向磁力轴承的设计承载力为9.800 kN,气隙为0.7 mm。径向磁力轴承的设计承载能力为1.960 kN,定转子间气隙为0.6 mm。对磁力轴承的承载特性以及氦气轮机转子的动力学特性进行了研究,转子动力学计算的结果表明,在达到250 Hz的额定转速前,透平压气机转子必须通过两阶弯曲临界。

The design principle and technical features of the magnetic bearings for use in a 10 MW high temperature reactor-based helium turbine（HTR-10GT） power generation project were described and the detailed structure design and key design parameters of the magnetic bearings,given.A structure with an integral vertical arrangement was adopted for the rotor of the helium turbine.The above-mentioned rotor was supported by two radial magnetic bearings along with an axial magnetic bearing.The design load carrying capacity of the axial magnetic bearing was 9.800 kN with a clearance of 0.7 mm.The design load carrying capacity of the radial magnetic bearings reached 1.960 kN with a clearance between the stator and rotor being 0.6 mm.Furthermore,the load carrying characteristics of the magnetic bearings and the kinetic characteristics of the helium turbine rotor were studied.The results calculated by using the rotor kinetics show that before arriving at the rated speed of 250 Hz,the turbine and compressor rotor must pass through the first and second order bending critical speed.