摘要
针对润滑油从齿轮箱轴承端盖处泄漏的问题,为进一步提高列车齿轮箱轴端密封性能,文中设计了一种装配在传动轴上由3个叶轮组成的新型密封结构。该结构位于轴承端盖内部,在随传动轴双向同步转动过程中会搅动轴承端盖内部的油气混合流体,在轴承端盖中部形成高压区域,有效阻断齿轮箱内外气体流通。通过三维软件建立密封结构的流道模型,根据流道模型的流体分析结果,研究密封结构不同结构参数对密封效果的影响。结果表明新型密封结构在两侧叶轮厚度为16 mm,中部叶轮厚度为9 mm,两侧叶片倾角为20°时,密封结构流道模型的中部区域重点平面的平均压强比两侧区域高23 Pa,并且油气混合流体在密封结构的叶轮间会形成涡流,可有效阻止润滑油泄漏,提高列车齿轮箱轴承端盖处密封效果。当齿轮箱转速提高时密封结构的密封效果将更加显著。
In view of the problem that lubricating oil leaks from the bearing end cap of the gearbox,in order to further improve the sealing performance of the train gearbox shaft end.In this paper,a new sealing structure is designed which consisting of three impellers assembled on the transmission shaft.This structure is located inside the bearing end cap.During the bidirectional synchronous rotation with the transmission shaft,it will stir the oil and gas mixed fluid inside the bearing end cap,forming a high-pressure area in the middle of the bearing end cap,effectively blocking the gas communication inside and outside the gearbox.The channel model of the sealing structure is established by 3D software.According to the fluid analysis results of the channel model,the influence of different structural parameters of the sealing structure on the sealing effect is studied.The results show that when the thickness of impellers on both sides of the new sealing structure is 16mm,the thickness of the middle impeller is 9mm,and the inclination angle of the blades on both sides is 20°,the average pressure of the key plane in the middle area of the flow passage model of the sealing structure is 23 Pa higher than that in the two sides,and the oil and gas mixed fluid will form eddy currents between the impeller of the sealing structure,which can effectively prevent the leakage of lubricating oil and improve the sealing effect at the bearing end cover of the train gearbox.When the speed of the gearbox increases,the sealing effect of the sealing structure will be more significant.
作者
林佳旭
李宝良
LIN Jiaxu;LI Baoliang(Harbin Metro Group Co.,Ltd.,Harbin 150001 Heilongjiang,China;Dalian Jiaotong University,Dalian 116028 Liaoning,China)
出处
《铁道机车车辆》
北大核心
2023年第3期68-72,共5页
Railway Locomotive & Car
关键词
轴端密封
叶轮
流体力学分析
shaft end seal
impeller
hydrodynamics analysis
