Abstract:

A kind of self-pumping hydrodynamic mechanical seal, that the liquid inlet groove was arranged on the stationary ring and the dynamic pressure groove was distributed on the rotating ring, was put forward based on the principle of centrifugal pump. The experimental scheme of the self-pumping mechanical seals was designed by orthogonal test. The numerical simulation experiments were carried out based on Fluent, including discussing the significant effects of every parameter on the face opening force and the leakage rate. The numerical results showed that the groove number N_g, the ratio of groove length and dam length γ, the ratio of groove width and ridge width d, and the pressure p were the significant factors affecting the opening force F_O and the leakage rate Q within the experimental ranges. Besides, the rotate speed n also affected Q significantly. Specifically, F_O was increased with increasing g, d and p, while decreased with increasing N_g. The influence of g, d, p and N_g on Q was similar to that on F_O. But Q was also increased with increasing n. The preliminary optimization of sealing structure was brought forward by analyzing the results of orthogonal test.

Key words: self-pumping mechanical seal, orthogonal test, numerical simulation, CFD, optimization

摘要：

提出了一种进液槽设置于静环、动压槽分布于动环的自泵送流体动压型机械密封;运用正交试验法设计了自泵送机械密封试验方案,并基于Fluent进行了数值模拟试验,探讨了各试验参数对端面开启力和泄漏率影响的显著性。研究结果表明:在试验参数范围内,影响端面开启力F_O的显著因素为槽数N_g、槽长坝长比g、槽台宽比d和压差p;影响泄漏量Q的显著因素为槽数N_g、槽长坝长比g、槽台宽比d、转速n和压差p;具体表现为开启力随着槽长坝长比、槽台宽比、密封端面内外压差的增大呈上升趋势,随着槽数的增多呈下降趋势;泄漏量随着槽长坝长比、槽台宽比、转速、密封端面内外压差的增大呈上升趋势,随着槽数的增多而呈下降趋势。依据正交试验分析结果,提出了初步优化的密封端面型槽结构。

关键词: 自泵送机械密封, 正交试验, 数值模拟, 计算流体力学, 优化