出油阀高压密封面气蚀失效分析及结构改进

李凯，刘井年，丁国华，于百洪，刘海军

潍柴动力股份有限公司，山东 潍坊  261061

摘要：为解决某高压共轨泵出油阀高压密封面气蚀问题，分析气蚀的机理和密封失效原因，采取在出油阀密封面增加凹槽、增大连通孔、在导向面上增加导向槽、减小凹槽壁等优化措施，并对优化后出油阀进行仿真和台架试验验证。仿真结果表明：优化后，出油阀高压密封面处气泡的数量明显减少，爆破压力由140 MPa降低到10 MPa。台架试验后拆解发现出油阀高压密封面无明显气蚀痕迹。

关键词：气蚀；高压共轨泵；出油阀；高压密封

Cavitation failure analysis of high-pressure sealing surface of

outlet valve and its structural optimization

LI Kai, LIU Jingnian, DING Guohua, YU Baihong, LIU Haijun

Weichai Power Co., Ltd., Weifang 261061,China

Abstract：In order to solve the cavitation problem of the high-pressure sealing surface of the oil outlet valve of a common rail pump, the mechanism of cavitation and the causes of seal failure are analyzed, and the structure of the oil outlet valve is optimized: increasing the groove on the sealing surface of the oil outlet valve, increasing the through hole, increasing the guide groove on the guide surface, and reducing the excess wall thickness of the groove. The simulation results show that after the optimization, the number of bubbles at the high-pressure sealing surface of the outlet valve is significantly reduced, and the bursting pressure is significantly reduced. In the bench test, it is found during disassembly that there are no obvious signs of cavitation on the high-pressure sealing surface of the oil outlet valve.

Keywords:cavitation；high-pressure common rail pump；outlet valve；high-pressure sealing