斯特林发动机杆密封装置性能与密封件摩擦学研究
发布时间：2018-08-18 18:32
【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。
[Abstract]:Stirling engine is a kind of piston engine with external heating or combustion. It uses hydrogen or helium as working fluid, adopts contact sealing device, and works according to closed regenerative cycle. The ideal dynamic seal of Stirling engine should achieve good sealing, low power consumption and long life. Therefore, improving the sealing performance of the sealing device and reducing the wear rate of sealing parts are the key to the development of Stirling engine to high power. In this paper, the basic principle and development status of Stirling engine are briefly introduced, and the sealing mechanism of piston rod, wear mechanism of friction pair and typical sealing structure of Stirling engine are expounded. On this basis, the piston rod seal structure which accords with Stirling engine is designed, that is, the combined seal structure of cap seal and sliding seal. In this paper, based on the contact seal mechanism, the factors influencing the cap seal and sliding seal are studied, and the mathematical models of contact pressure under the conditions of pressure, temperature and assembly interference are established, and the wear mechanism is used as the foundation. The factors that affect the friction and wear of sealing parts are studied, and the mathematical models of oil film parameters and friction coefficient, roughness and volume wear under the condition of oil lubrication are established. Thirdly, the Stirling piston rod seal test bench is built. Quantitative measurement is used to verify the correctness and applicability of the mathematical model, and the influence of working conditions on the sealing performance and wear rate of the seal is found out. In this paper, a method to improve the sealing performance of piston rod seal of Stirling engine and to reduce its friction and wear is put forward theoretically, and the prospect of the development of Stirling engine seal device in the future is put forward.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH136
本文编号：2190325
[Abstract]:Stirling engine is a kind of piston engine with external heating or combustion. It uses hydrogen or helium as working fluid, adopts contact sealing device, and works according to closed regenerative cycle. The ideal dynamic seal of Stirling engine should achieve good sealing, low power consumption and long life. Therefore, improving the sealing performance of the sealing device and reducing the wear rate of sealing parts are the key to the development of Stirling engine to high power. In this paper, the basic principle and development status of Stirling engine are briefly introduced, and the sealing mechanism of piston rod, wear mechanism of friction pair and typical sealing structure of Stirling engine are expounded. On this basis, the piston rod seal structure which accords with Stirling engine is designed, that is, the combined seal structure of cap seal and sliding seal. In this paper, based on the contact seal mechanism, the factors influencing the cap seal and sliding seal are studied, and the mathematical models of contact pressure under the conditions of pressure, temperature and assembly interference are established, and the wear mechanism is used as the foundation. The factors that affect the friction and wear of sealing parts are studied, and the mathematical models of oil film parameters and friction coefficient, roughness and volume wear under the condition of oil lubrication are established. Thirdly, the Stirling piston rod seal test bench is built. Quantitative measurement is used to verify the correctness and applicability of the mathematical model, and the influence of working conditions on the sealing performance and wear rate of the seal is found out. In this paper, a method to improve the sealing performance of piston rod seal of Stirling engine and to reduce its friction and wear is put forward theoretically, and the prospect of the development of Stirling engine seal device in the future is put forward.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH136
【引证文献】
相关硕士学位论文 前1条
1 邹城;小型斯特林发动机换热系统的研究[D];广东工业大学;2013年
本文编号：2190325
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