Abstract:

A kind of self-pumping hydrodynamic mechanical seal was presented based on the principle of centrifugal pump. The three-dimensional flow fields of self-pumping grooves were analyzed using Fluent, and the influences of geometric parameters and operating parameters on the sealing properties, including opening force and leakage rate were also discussed. Leakage rate and opening force decreased with increasing speed, and increased with increasing pressure, aperture diameter, helix angle and the ratio of groove width and ridge width. With increasing groove number, ratio of groove length and dam length, opening force decreased and leakage rate increased slightly. The influence of groove depth on opening force was similar to the influence on leakage rate, and there existed an optimal groove depth which could achieve higher opening force and lower leakage rate. Consequently, the self-pumping hydrodynamic mechanical seal proposed could get larger opening force and lower leakage rate by matching groove parameters.

Key words: mechanical seal, self-pumping, mechanical properties, computer simulation, numerical analysis

摘要：

基于离心泵工作原理提出了一种自泵送流体动压型机械密封,并运用Fluent软件对自泵送型槽进行了三维流场动力学仿真分析,探讨了几何参数和工况参数对自泵送流体动压型机械密封性能即端面开启力和泄漏率的影响。研究结果表明:转速增大,开启力和泄漏率均减小;介质压力、槽台宽比、引流孔孔径及螺旋角增大,开启力和泄漏率均增大;随着槽数、槽长坝长比的增大,开启力均有所降低,泄漏率略有增大;槽深对开启力和泄漏率的影响趋势相似,存在一个使开启力较大而泄漏率较小的槽深;通过型槽参数匹配,自泵送流体动压型机械密封可以获得足够的开启力和较低的泄漏率。

关键词: 机械密封, 自泵送, 力学性能, 计算机模拟, 数值分析