流体静压型机械密封中辅助密封位置对密封性能的影响

The influence of the position of auxiliary seal on sealing performance in the hydrostatic mechanical face seal

辅助密封是静压型机械密封重要的组成部分,其位置变化会对高压条件机械密封的性能产生重要影响,针对该问题,本文考虑密封组件之间的多体接触关系与O形圈辅助密封的影响,建立了静压型机械密封的热流固耦合计算模型。基于此模型,分析了机械密封性能随辅助密封位置参数变化的规律和机理,对比了不同安装部位O形圈位置参数的敏感性程度。结果表明,不同安装部位O形圈的位置参数对机械密封性能影响程度显著不同,其中密封环背部O形圈对密封性能影响极大,其泄漏率的平均变化率为2.06,因此在设计和制造过程中需特别注意。

The auxiliary seal is an essential part of the hydrostatic mechanical face seals,which has an important impact on the performance of the mechanical face seal under high pressure.In response to the problem,considering the multi-body contact relationship between the sealing components and the influence of the O-ring secondary seal,a thermal fluid-solid interaction model for hydrostatic mechanical face seal was finally developed.Based on this model,the change law and mechanism of the performance of the mechanical face seal with the position parameters of the auxiliary seal were analyzed,and the sensitivity of O-ring position parameters were compared.The results show that the O-rings installed in different positions influence the seal performance very differently.The O-ring located on the back of rings has the most significant impact on performance,whose average rate of change in leakage rate is 2.06,therefore,particular attention is required in the design and manufacturing process.