Thermal-fluid-solid Coupling Model and Performance Analysis of Single Metal Seals in Cone Bits

MA Yi1,2；NI Yang1；MENG Xiangkai1,2；PENG Xudong1, 2；JIANG Jinbo1,2

1. 1.College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou,310023
2.Engineering Research Center of Process Equipment and Remanufacturing,Ministry of Education,Zhejiang University of Technology,Hangzhou,310023
• Online:2020-10-10 Published:2020-10-20

牙轮钻头用单金属密封热流固耦合模型与性能分析

1. 1.浙江工业大学机械工程学院，杭州，310023
2.浙江工业大学过程装备及其再制造教育部工程研究中心，杭州，310023
• 基金资助:
国家自然科学基金资助项目(51975527)；
国家自然科学基金航天先进制造技术研究联合基金资助项目(U1737202)；
浙江省自然科学基金资助项目(LY18E060011)

Abstract: The asperity contacts, thermal-mechanics deformations and viscosity-temperature characteristics of seal end faces were considered comprehensively, the interrelated systems of sealing rings and auxiliary seals, lubricant films and sealing mediums were constructed, a thermal-fluid-solid coupling mathematical model was established for single metal seals in cone bits. Furthermore, the influences of key parameters such as environmental pressures and bit speeds on the film thickness distribution, temperature rises and sealing performances of single metal seals were studied. The results show that the gaps of single metal seal end faces gradually evolve from convergent to divergent with the increasing of drilling depths and environmental pressures. The extreme points of film thicknesses and temperature rises migrate from outer diameter to inner diameter, and the critical turning point of environmental pressures is around p0=11 MPa. Under the high pressure conditions, the contact pressures on the inner diameter sides of seal end faces increase, which is not conducive to the formation of lubricating films. The leakage rates and frictional forces of the sealing systems increase with the increasing of bit speeds, while the drilling efficiency may be improved by increasing the bit speeds reasonably under low pressure conditions.

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