整体式离心压缩机高速轴转子动力学分析

Dynamics Analysis of the Integral Centrifugal Compressor High-speed Shaft Rotor

为了提高整体离心式压缩机高速齿轮轴转子的稳定性与可靠性,通过专业转子动力学分析软件建立了高速轴转子的动力学模型,分析叶轮与轴承等因素的变化对转子动力学性能的影响。通过增加叶轮转动惯量,减小叶轮质量、叶轮质心与轴承间距,增加齿轮箱轴承跨距、增大轴承轴颈与轴承刚度等措施可提高转子的一阶临界转速;通过增加叶轮转动惯量,减小叶轮质量、叶轮质心与轴承间距,减小齿轮箱轴承跨距、轴承轴颈,增大支承轴承刚度等措施可提高转子的二阶临界转速。反之则降低转子的一阶、二阶临界转速。

In order to improve the stability and reliability of the integral centrifugal compressor high-speed gear shaft rotor,the dynamics model of the high-speed shaft rotor is established by the professional analysis software. The influence factors of the impeller and the bearings on the dynamics performance of the rotor is analyzed. Through the measurements of increasing the rotational inertia of the impeller,decreasing the mass of the impeller and the distance of the impeller to the bearing,increasing the bearing span of the gear box,bearing shaft diameter and the bearing stiffness,the first order critical speed of the rotor can be improved. Through the measurements of increasing the rotational inertia of the impeller,decreasing the mass of the impeller and the distance of the impeller to the bearing,decreasing the bearing span of the gearbox and the bearing shaft diameter,increasing the bearing stiffness,the second order critical speed of the rotor can be improved. On the contrary,the first and second order critical speed can be reduced.