平衡梁结构对水润滑可倾瓦推力轴承启停过程的影响

Influence of the Equalizing Beam Structure on the Water Lubrication Tilting-pad Thrust Bearing during Start-up and Shut-down

建立了带平衡梁结构的水润滑可倾瓦推力轴承启停过程瞬态模型,在该模型中考虑了界面滑移、挤压作用和支点变形的影响。采用该模型分析了相同运行条件下平衡梁结构与非平衡梁结构的可倾瓦推力轴承的启停过程。分析结果表明:随着瓦面高度误差的增加,轴承的启停转速增加。设计了一套水润滑可倾瓦推力轴承机理研究试验系统,包括平衡梁与非平衡梁结构的可倾瓦推力轴承,并对两种轴承的启停过程进行试验。试验结果表明:非平衡梁结构可倾瓦推力轴承各瓦之间的载荷误差达到90%,而平衡梁结构可倾瓦推力轴承各瓦之间的载荷误差小于4.6%。平衡梁结构可以降低轴承的启停转速,同时提高轴承加工及安装误差的最大许可范围。试验结果与理论分析结果取得较好的一致性。

A transient model of tilting-pad thrust bearing with equalizing beam structure during start-up and shut-down is established.In this model,interface slippage,squeezed and the wear of the pivot are considered in this transient model.Under the same operation conditions and geometrical dimensions of thrust pad,the starting characteristics of tilting-pad thrust with and without equalizing beam structure are studied.Numerical analysis results show that equalized beam structure could reduce opening speed of the tilting pad thrust bearing.As the installation error increase with the opening speed increase,therefore,equalizing beam structure reduce the installation requirements of tilting-pad thrust bearing.A scaled test rig of tilting-pad thrust bearing with equalizing beam structure or without equalizing beam structure is designed.The experimental results show that,compared with the thrust bearing with equalizing beam,the maximum load difference of each pad are more than 90%in tilting-pad thrust bearing without equalizing beam structure,the difference value of the tilting-pad thrust bearing with equalizing beam structure is less than 4.6%.Equalizing beam structure could reduce the opening speed and increase the tolerance of installation error.The experimental results are consistent with the numerical results.