空调压缩机舌簧排气阀运动过程的有限元仿真

Finite Element Simulation of Movement process of Reed Valve for Air-Conditioning Compressor

空调压缩机工作时排气阀阀片在循环气压作用下往复运动进而形成断裂。针对该问题,研究使用有限元方法基于Ansys Workbench平台中的显示动力学模块,对阀片工作时的运动和碰撞全过程进行了动力学仿真,模拟阀片工作时的变形、运动速度和等效应力随时间变化过程。计算发现阀片在上升过程中与限位器表面存在渐进的多次碰撞,导致阀片运动中出现微颤现象,引起速度的波动。阀片与限位器的碰撞同时还导致阀片内最大应力位置的改变,模拟结果显示阀片运动过程中的最大应力发生在阀片中段,而非静载条件下的阀片根部,这与工程应用中阀片的实际断裂情况相吻合。

The reed valve of exhaust valve in air-conditioning compressor reciprocates under circular air pressure and therefore,leading to fatigue failure.Focused on this issue,dynamic simulations of the motion and collision of reed valve during working have been performed using finite element method with the Explicit Dynamic module of Ansys Workbench.The deformation,velocity and stress of reed valve were analyzed.It is found that the reed valve collides with lift limiter step by step during ascending,leading to reed valve trembling and velocity oscillation.The collision also leads to the shift of position of peak stress.Simulation results show that the peak stress of reed valve during dynamic motion takes place in the middle part of plate,instead of the root of reed valve under static load condition,which is consistent with the real fracture profile observed in engineering applications.