【作者】 雷振宁；

【导师】 龚俊； 杨东亚；

【作者基本信息】 兰州理工大学 ， 机械设计及理论， 2012， 硕士

【摘要】 斯特林发动机是一种外部供热或燃烧的活塞式发动机，它以氢气或氦气为工质，采用接触式密封装置，按闭式回热循环的方式进行工作。理想的斯特林发动机动密封应该实现良好的密封、低功耗及长寿命，因此提高密封装置的密封性能并降低密封件的磨损率则成了斯特林发动机能否向大功率发展的关键。本文简要介绍了斯特林发动机基本原理和发展现状，阐述了斯特林发动机活塞杆的密封机理、摩擦副磨损机制及典型密封结构。在此基础上设计出符合斯特林发动机的活塞杆密封结构，即帽式密封加滑动密封的组合式密封结构。本文首先以接触式密封机理为基础，研究影响帽式密封和滑动密封的因素，分别建立压力、温度及装配过盈量条件下的接触压力数学模型；其次，以磨损机制为基础，研究影响密封件摩擦磨损的因素，建立有油润滑状态下的油膜参数与摩擦系数、粗糙度与体积磨损量的数学模型；再次，搭建了斯特林活塞杆密封试验台，用试验方法定量测量、分析以验证该数学模型的正确性和可应用性，并找出各工况参数对密封件的密封性能及其磨损率的影响规律；最后，结合试验分析的结果，从理论上提出了提高斯特林发动机活塞杆密封件的密封性能和减缓其摩擦磨损的方法，并对未来斯特林发动机密封装置的发展提出了展望。更多还原

【Abstract】 Stirling engine is a external-heating or burning piston engines which usesHydrogen or Helium as medium, working by closed feedback thermal cycling withcontact seal equipment. The ideal Stirling engine should achieve excellent sealing，lowconsume and the lifetime demand of friction pair. Therefore, improving the workingperformance of sealing effect and reducing the wear extent of sealing elements is thekey point of the high-power sealing of Stirling engine.In this paper, the brief introduction of the basic theories and development outlineof Stirling engine is accomplished. On the basis of the explanation of piston rod sealmechanism, friction pair wear mechanism, the typical seal structure and the commonsealing element structures, the fitting piston rod seal structure is designed, that isassociate structure: cap sealing plus sliding sealing.In this paper, the research of cap sealing and sliding sealing and the contact forcemathematical model on the condition of pressure, temperature and assemblinginterference is firstly accomplished. Then, on the basis of wear mechanism, theinfluential elements of seal wear are researched, and the mathematical model of oilslick parameters according to friction ratio, harshness and volume wear extent isfounded. Flowingly, the Stirling piston rod sealing testing bed is established, whichprovides experimental methods to prove the validity and availability of oil slick model,and the effective rules of working parameters to sealing element function and wearingeffects. Finally, with the experiment results, the theoretical method that improves theworking performance and reduces the wear extent of Stirling engine piston rod sealingelements is proposed. And look forward to the future development of sealing device ofStirling engine.更多还原