密封锥角对针阀偶件密封面形变和应力的影响

杨宏伟，杨显锋，陈晓欢，高怡，马梁，康彦红，李华乐，徐丹

中国北方发动机研究所（天津），天津300400

摘要：以喷油器针阀偶件为研究对象，运用ANSYS分析软件建立针阀与针阀偶件的有限元模型，仿真分析针阀与针阀偶件的形变及等效应力、偶件在静态接触与碰撞状态下的等效应力，对比研究不同密封锥角对喷油器密封面磨损的影响。研究发现：密封锥面与压力室圆柱面交线处的形变和应力最大，不同密封锥角的针阀座最大形变基本相同，为1.443 3~1.444 0 μm；喷油嘴针阀偶件的密封锥角为60°时，针阀偶件的最大等效应力为285.02 MPa；密封锥角为120°时，最大等效应力为318.91 MPa，最易导致喷油器针阀偶件磨损失效。

关键词：针阀偶件；密封锥角；等效应力；形变

Influenle of sealing cone angle on deformation and stress ofsealing surface of needle valve couples

YANG Hongwei, YANG Xianfeng, CHEN Xiaohuan, GAO Yi, MA Liang,KANG Yanhong, LI Huale, XU Dan

China North Engine Research Institute (Tianjin), Tianjin 300400, China

Abstract:This paper takes the injector needle valve couples as the research object, the finite element model of the needle valve and the needle valve couples are established by ANSYS analysis software. The deformation and equivalent stress of the needle valve and the needle valve couples, as well as the equivalent stress of the needle valve couples in the state of static contact and collision, are simulated and analyzed, and the effects of different sealing cone angles on the wear of the sealing surface of the injector are compared. The results show that the equivalent contact stress of the needle valve couples is the smallest when the sealing cone angle of the needle valve coupling is 60°, and the largest when the sealing cone angle is 120° which is most likely to cause the wear failure of the injector needle valve couples.

Keywords:needle valve couples; sealing cone angle; equivalent stress; deformation