外在激励对流体静压型机械密封动态稳定性的影响

External Excitation Influence on the Dynamic Stability of Hydrostatic Pressure Mechanical Seal

机械密封动力学性能对密封系统稳定性有很大的影响,微小的振动会导致密封泄漏量增加和端面磨损加剧。根据机械动力学原理,建立了流体静压型机械密封静环轴向振动和角向摆动的动力学耦合方程,通过解耦得到两个独立的线性振动方程。在Simulink环境下,利用MATLAB软件编程模拟分析了几种典型的外在激励对密封环动态稳定性的影响,得到最佳的试验密封环结构参数值。模拟分析表明,若要密封环在角向有尽量小的摆动,就必须选取较大的转折半径,且端面锥角尽量趋向于零;若要减小轴向的振动强度,就须减小端面锥角,且尽量避免取转折半径可选范围的中间值。

The dynamic performance of mechanical seal has significant influence on sealing system stability, small vibration can cause sealing leakage increasing and end face excessive wear. Based on the mechanical dynamic principle, the dynamic coupled equations of axial vibration and angular vibration of the stator were established. By decoupling, two independent linear vibration equations were obtained. In SIMULINK environment, using MATLAB software programming, the influence of several typical external excitations on sealing system dynamic stability was analyzed, and the best parameters of mechanical seal were obtained. The simulation results indicate that, in order to keep as small as possible angular swinging in the stator, the larger turning radius of the seal and smaller coned angel of end face seal are needed. In order to reduce the axial vibration strength, the coned angel of end face should get its smaller value, and try to avoid the turning radius get the intermediate values of optional range.