汽轮机盘车结构初始啮合应力的三维有限元分析

Three Dimensional FEM Analysis of Initial Joggling Stress for Steam Turbine Barring Structure

棘轮棘爪式液压盘车装置因其结构紧凑常在船用汽轮机组中使用,设计中需要验证棘轮棘爪啮合受力,以判断其强度是否合格。实际使用时,转子初始位置存在不确定性,导致棘轮棘爪初始啮合点存在多种相对位置状态。文章对不同初始啮合状态下的棘轮棘爪受力进行计算,发现在啮合转折点附近棘轮棘爪的应力最大,分别达到367 MPa和372 MPa,是最理想啮合状态下的2.6倍和1.5倍,表明啮合最恶劣工况下受力要远严苛于理论啮合状态。

Due to the compact structure, the ratchet pawl hydraulic disc brake device is frequently used in the ship steam generator unit. It is necessary to verify the contact stress when the ratchet pawl is joggled to judge whether the strength is qualified. In actual use, the uncertainty of the initial position of steam generator rotor leads to the various relative angles at the initial joggled points of ratchet pawls. The contact stresses of ratchet pawls under different initial joggling angles are investigated. It is found that the contact stress of ratchet pawls is largest at 6 relative degree reaching up to 367 MPa and 372 MPa respectively, which are 2.6 times and 1.5 times of that of the ideal joggling state. The results indicate that the strength of joggling under the worst working conditions is much more critical than that of theoretical joggling state.