轴线倾斜及接触变形下平衡梁轴承均载性能

Load Sharing Performances of Large-scale Equalizing Beam Thrust Bearings Considering Rotor Misalignment and High-pair Contact Deformation

针对大型重载平衡梁可倾瓦推力轴承在轴线倾斜下的承载问题,分别建立高副接触变形方程和以支点膜厚为特征的瓦块膜厚方程,结合平衡梁组件的自适应动力学模型,研究典型工况下轴线倾斜大小和位置以及重载下平衡梁组件的高副接触变形对轴承均载能力的影响。结果表明:平衡梁组件高副接触变形在一定程度上可以改善轴承承载的均匀性,但随着倾角增大载荷不均匀差异性是不能被接受的;在轴线投影过瓦间、轴线投影过瓦块中心线、轴线投影过瓦块支点3种典型投影位置下,自适应平衡梁轴承的性能具有相似特性,平衡梁结构并不能实现完全均载;同时,轴线倾角φ存在一个临界值φe,当φ>φe时,轴承各瓦的性能差异会显著增大,因此在大尺寸大载荷平衡梁轴承设计时需要考虑材料的高副接触变形并对最大约束倾角φ提出规范。

For the carrying performance of a large-scale heavy-duty equalizing beam thrust bearing considering the rotor misalignment,the high-pair contact deformation equation and the film thickness equation characterized by pivot film thickness were established respectively.Combined with the adaptive dynamic model of equalizing beam component,the influence of the angle and position of rotor misalignment and the contact deformation of the high-pairs of the equalizing beam assembly on the load sharing performance of the bearing under typical working conditions were studied.The results show that the contact deformation of high-pair materials of equalizing beam components can improve the uniformity of the bearing load to a certain extent,but the uneven load difference will be unacceptable as the inclination angle increases.The performances of equalizing beam bearing under three typical projection positions,i.e.,the axis projection passes through the middle of two pads,the pad centerline and the pad pivot have similar characteristics,and the load sharing capacity of equalizing beam component is not completely shared.There is a critical valueφe for the rotor misalignment angleφ,whenφ>φe,the performance difference of the bearing pads will increase significantly.Therefore,it is necessary to consider the high-pair contact deformation and propose a specification for the maximum constrained inclination angleφwhen designing the equalizing beam thrust bearing with large size and large load.