渐开线转子密封用宽顶的型线构造研究

Research of Composed Profile with Wide Top High-sealing Zone of Involute Rotor

为实现渐开线转子的高性能设计,基于4种可能的顶结构,从型线参数化、形状系数上限、容积利用系数、尺寸优化等7个方面,构建转子的高性能型线。然后,以转子轻量化为目标,构建优化模型。最后就闭气现象,给出型线上的创新方法。结果表明,顶宽兼顾了容积利用系数和圆弧密封长度最大化的高性能需求;谷避让圆弧能有效消除闭气现象,降低加工成本;形状系数和容积利用系数与顶半角具有近似的负线形相关等。为其他类型线的顶宽结构,提供一种优化设计与全参数造型的方法。

To realize the higher performance design of involute rotor,based on four possible top structure,from seven aspects of profiles parameterization,the limit value of shape coefficient,volume utilization coeffi cient,size optimization and so on,the higher performance profiles with wide top for high-sealing zone is finally constructed.Then,from lightweight of rotor as design object,the optimization model is constructed.Finally,an innovative configuration of profiles is given to eliminate trapped-gas phenomenon.All results show that the inno vative profiles is meet high performance requirement for maximizing volume utilization coefficient and minimiz ing radial top leakage.The trapping-gas phenomenon is eliminated better by the new avoid-arc,which is easy machined.The shape coefficient or volume utilization and top half angle have approximately negative linear cor relation,etc.It is concluded that the full parametric modeling and design method can be used for other rotor pro files with radial high-sealing zone.