摘要
为了解决双向流体动压机械密封稳定运行需要提供洁净的阻塞流体这一问题,提出一种双向自泵送流体动静压型机械密封,运用Fluent软件对泵出式和泵入式双向自泵送机械密封进行了数值研究,得到了双向自泵送机械密封的开启力、泄漏量和刚度,分析了流场压力分布、速度分布特性与密封性能之间的关系.结果表明:泵入式双向自泵送机械密封具有较大的开启力,泵出式具有较小的泄漏量,两者工作时都不需要阻塞流体辅助供应系统;泵出式型槽内流体流动方向约为-90°,由槽根部指向槽外径处,泵入式型槽内流体流动方向约为70°,在密封坝与槽根部相连的区域中流体流动的方向约为-80°,均指向引流孔,形成了良好的抗颗粒干扰性;泵入时端面流体膜刚度大于泵出时的端面流体膜刚度.研究成果为双向机械密封的设计、制造与运行提供了理论支撑.
The stable operation of bidirectional hydrodynamic mechanical seal need clean blocking fluid and assistance system. To solve this problem,a bidirectional self-pumping hydrodynamic-static mechanical seal was presented. Fluent was used to carry out numerical simulation on pumping-out and pumping-in hydrodynamic mechanical seals,so as to achieve the opening force,lea-kage and stiffness of mechanical seals and to analyze the relationship between the flow field characteristics and the sealing performance. The results show that the pumping-in hydrodynamic mechanical seal has larger opening force,while the pumping-out hydrodynamic mechanical seal has smaller leakage. Both of them do notneed assistance system to provide blocking fluid. The flow direction of the fluid in the groove of the pumping-out type is around-90°,the fluid flows from the root to the outside of the groove. For the pumping-in type,the flow direction of the fluid in the groove is around 70°,while that in the area linking the seal dam and groove root is around-80° and both direct are at the drainage hole. The pumping-in and pumping-out hydrodynamic mechanical seals have great capabilities to antiparticle. The stiffness of the pumping-in hydrodynamic mechanical seal is bigger than that of the pumping-out type.The research provides a theoretical foundation for the design,manufacture and operation of the bidirectional self-pumping hydrodynamic-static mechanical seal.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2017年第8期692-699,共8页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51375245
51505230)
江苏省自然科学基金资助项目(BK20130976)
江苏省大学生创新训练计划资助项目(201410298051Z)
关键词
机械密封
数值模拟
流场特性
密封性能
mechanical seal
numerical simulation
flow field characteristics
sealing performance
