600 MW级汽轮发电机组联轴器强度分析

Analysis on the Coupling Strength of a 600 MW Class Turbo-Generator Unit

建立了某600 MW级机组低压转子和发电机转子间的联轴器的有限元模型,在额定工况及典型电气故障下分析得到联轴器的应力分布,确定危险部位并开展强度校核。结果表明:在额定工况下,联轴器所承受的扭矩主要靠联轴器端面之间的静摩擦力传递,螺栓的剪切应力较小;在典型电气故障下,联轴器所承受的扭矩需要更多地依靠联轴器端面螺栓孔和螺栓螺杆的挤压作用来传递,螺栓的剪切应力较大;不同机组状态下,联轴器危险部位的位置有所变化,可视情况合理优化应力集中部位结构以保障联轴器安全性。

A finite element model of the coupling between the low-pressure rotor and the generator rotor for a 600 MW class unit was established.The stress distribution on the coupling was analyzed under rated condition and typical electrical failures.The dangerous positions were determined and the strength checking was carried out.Results show that under rated condition,the torque is mainly transmitted by the static friction force between the end faces of the coupling,and the shear stress of the bolt is small;under typical electrical failures,the torque transmission depends to a large extent on the squeezing of the bolt hole on the end face of the coupling and the bolt screw,and the shear stress of the bolt is large;under different unit states,the dangerous position has a change,so the structure of the stress concentration parts could be optimized reasonably to ensure the safety of the coupling.