轴向推力轴承性能仿真及试验研究

摘要

推力轴承是离心压缩机的关键部件，其性能对压缩机的可靠性有决定性的影响。本文首先利用THRUST软件建立了可倾瓦止推轴承的三维模型，并考虑轴承瓦块、推力盘和油膜之间的流场-温度场-弹性变形的耦合，获得转子转速1500 r/min，2000r/min，2500 r/min，3000r/min 和3500r/min下可倾瓦推力轴承的油膜厚度、转子轴向位移及轴瓦温度。同时，建立试验装置并进行试验研究，最大轴承载荷为30000N。最后将试验结果与软件仿真结果相对比，发现模拟得出的瓦块温度和轴位移值与试验相吻合，从而证明THRUST软件的算法适用于本文研究的工况范围内的推力轴承的模拟，可为推力轴承的性能预测、优化设计及改造提供指导。%Thrust bearing is the key component of centrifugal compressor, which performance has a decisive influence on the reliability of the compressor. This paper firstly uses the software-THRUST to establish three-dimensional model of titling-pad thrust bearing, and considers the coupling of flow field-temperature field-elastic deformation among the pad, the fluid film and the collar, to obtain the titling-pad temperature, oil film thickness and axial pad deformation under the rotor speed of 1500r/min, 2000r/min, 2500r/min, 3000r/min and 3500r/min. At the same time, the experiment device is established, which the largest bearing load is 30 000N. Finally, through comparing simulation results with experimental results, it is obtained that the pad temperature and axial displacement values of simulation is close to experimental results. Result of the study can provide theoretical guidance for the performance prediction, design optimization and transformation of the thrust bearing.