Abstract:

Dynamic characteristics affects the operational reliability of non-contacting mechanical seals, which involves the complex relationship between the system of non-contact mechanical seals, excitation and response. Hence, it is one of the hot topics of current research. In this paper, the development of non-contact mechanical seals dynamics at home and abroad in the past 40 years was reviewed. The research status of dynamic response theory and experiment and application of non-contact mechanical seals system was analyzed. The response of the input load to rotating and stationary rings’ displacement based on the structural dynamic characteristics of the non-contact mechanical seal system was studied. The characteristics of the fluid film thickness response, and the identification method of the stiffness and damping of the fluid film, the natural frequencies and mode shapes of the system were discussed. The shortcomings of the existing dynamics studies was found as well. It is pointed out that coupling response of multi-frequency excitation, collision mechanism of rotating and stationary rings, non-linear identification method of dynamic parameters, intelligence, significant influence factors analysis and research on non-contact seals performance test under high parameter conditions should be taken more efforts in the future.

Key words: mechanical seal, dynamics, model, stability, response

摘要：

涉及密封系统、激励和响应三者之间复杂关系的动力学特性，对非接触式机械密封的运行可靠性有着重要影响，是当下密封理论与技术领域研究的热点。本文回顾了近几十年来国内外非接触式机械密封动力学的发展历程，分析了非接触式机械密封系统动力学理论研究、实验研究和应用研究状况，探讨了基于非接触机械密封系统结构动力学特性和输入载荷的动、静环位移响应、流体膜厚度响应的研究特征以及流体膜刚度和阻尼、系统的固有频率与振型模态等特性参数的识别方法，指出了现有动力学研究存在的不足，提出多频激励耦合作用响应、动静环的碰撞机制、动力学参数的非线性识别方法、智能化、显著性影响因素分析和高参数工况下的非接触式密封性能试验台等研究是非接触式机械密封动力学今后一段时期的发展方向。

关键词: 机械密封, 动力学, 模型, 稳定性, 响应