流体回流式机械密封技术研究进展

Progress in the study of the mechanical seals with return structures

现阶段机械密封的操作条件更加苛刻和多样化。在一些高参数的密封工况下,传统的接触式机械密封磨损严重、寿命较短,已达不到密封的基本要求。发展流体润滑的非接触式机械密封是保证设备长时间连续正常运转的迫切要求。流体回流式机械密封对普通机械密封端面进行简单改型,其结构简单、应用前景广阔,特别适合高压、高温、大尺寸等高参数工况。对具有回流特性的圆弧槽机械密封、螺旋槽上游泵送机械密封和水平槽机械密封的研究发展情况进行了综述,指出了开展深入研究水平槽机械密封的必要性。

At present, the operation conditions of mechanical seals are more and more demanding and diversified. At the condition of high-performance mechanical seal, the contact mechanical seals cannot meet the requirement of basic demand because of the hard abrasion of the end faces. It is necessary to develop the fluid lubricated non-contact mechanical seals. The mechanical seals with return structures that is the development of the traditional mechanical seals are simple in structure and have wide application fields, especially in those of high pressure, high temperature and large sizes. This paper presents a review about the development of the mechanical seals with circular groove, and the mechanical seals with spiral groove, and the mechanical seals with horizontal groove, which all have the return flow features. It is suggested that the mechanical seals with horizontal groove should be paid more attention to.