流体静压机械密封动力学性能分析

The Dynamic Characteristics of Hydrostatic 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。根据机械动力学基本原理,建立了流体静压机械密封轴向、角向振动的动力学耦合方程,并通过简化将其转化成相互独立的单自由度二阶微分方程。结合辅助密封圈的动态参数求解方法,通过MATLAB编程求出系统在内部微小扰动作用下,密封环在轴向和角向的动态响应曲线。分析表明,综合考虑振荡频率和振动幅度等因素,端面锥角保持在大于或等于2’的附近范围内,转折半径保持在大于或等于130mm的附近范围内,密封系统能够保持较好的稳定性。

The dynamic performance of mechanical seal has signifwant 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 statar were established. By decoupling, two independent linear vibration equations were obtained. Combined with the dynamic parameter solution method of auxiliary sealing ring, under internal small perturbation function, by MATLAB programming, the axial and angular dynamic vibration response of the stator are obtained. The analysis shows that, considering factors such as frequcncy and amplitude, when end cone angle keeps close to the greater than or equal to 2＇ range and turning radius keeps close to the greater than or equal to 130mm, sealing systems could maintain good stability.