尾轴密封用高速高压唇形密封圈失效研究

Investigation on the Failure of Tail Shaft Lip Sealing at High Speed and High Pressure

针对尾轴密封用高速高压唇形密封圈在模拟试验器运转过程中出现的泄漏故障,从唇形密封圈失效后的形貌特征以及结合红外光谱分析,确定唇形密封圈失效的主要原因为:高速、高压差交变载荷作用下,橡胶与金属粘着磨损同时摩擦生热加速橡胶老化,导致材料发生断裂,唇形密封圈密封失效;提高材料的耐高温性以及降低材料表面摩擦系数,能够有效解决唇形密封圈密封泄漏的难题。

Taking the lip seal used in tail shaft as the research subject,the leakage failure when the lip seal was tested by simulating experimental platform under high speed and high pressure was investigated,and the systemic analysis was carried out from the aspects such as seal materials,seal products structure and reduce surface friction coefficient.The results show that the main failure reasons of lip seal was the friction pair moves relative to each other would produce vast friction heat,reached the acrylonitrile-butadiene rubber upper boundary,generated the serious adhesive wear,occurred materials cracks,which caused lip seal failure.It is found that improved the high-temperature resistance performance of materials and reduce surface friction coefficient could promote the seal performance of lip seal and solved the problem of leakage.