U型槽机械密封流场性能研究

Study on Flow Field Performance of U-Type Groove Mechanical Seal

针对可双向旋转式机械密封流场分布及其稳态密封性能,建立U型槽机械密封液膜模型,采用专业流场计算软件对液膜进行流场模拟研究,探究流场分布及不同工况参数和几何参数对机械密封液膜流场稳态密封性能的影响规律。研究结果表明:U型槽机械密封可产生明显的流体动压效应,随着工况参数转速和密封压力的增大,密封稳态特性参数开启力和泄漏率呈近似线性增大的趋势;而随着几何参数槽深和膜厚的增加,泄漏率均线性增大,但随着膜厚的增大液膜的动压效应减弱使得密封开启力逐渐减小。综合考虑,当槽深取5μm、膜厚取3μm时整体密封性能最佳。

Aiming at the flow field distribution and steady-state sealing performance of the bidirectional rotary mechanical seal,a U-groove mechanical seal liquid film model was established,the professional flow field calculation software was used to simulate the flow field of the liquid film,and the flow field distribution and the influence of different working conditions and geometric parameters on the steady sealing performance of liquid film flow field in mechanical seal were explored.The results show that the U-groove mechanical seal can produce obvious hydrodynamic pressure effect,and the opening force and leakage rate of the seal steady-state characteristic parameters increase approximately linearly with the increase of the working condition parameters of speed and sealing pressure.With the increase of the geometric parameter of groove depth and film thickness,the leakage rate increases linearly,but as the film thickness increases,the dynamic pressure effect of the liquid film weakens so that the seal opening force gradually decreases.Considering comprehensively,the overall sealing performance is the best when the groove depth is 5μm and the film thickness is 3μm.