关键词: 汽轮机, 再热主汽阀机构, 运动性能, 可靠性, 间隙铰, 热变形

Abstract: A method was proposed for finding the leading influencing factors including thermal deformation, dimension errors and assembly concentricity errors which caused mechanical jamming, incompetence or delayed occlusion in the reheat-stop-valve mechanisms of steam turbines. Then, a functional virtual prototype of the valve mechanism and dynamics analysis were presented to deal with these problems. Simulation results showed that the dynamics performance of the valve mechanism was mainly determined by the comprehensive contribution of the factors and the assembly concentricity error was the major influencing factor causing uncertain dynamics performance. Consequently, an available approach for such a typical problem was put forward.

Key words: steam turbines, reheat-stop-valve mechanism, dynamics performance, reliability, clearance joint, thermal deformation