海工装备液压缸多重组合式密封结构设计与仿真分析

针对单个密封圈易磨损导致密封失效，且更换密封件过程繁琐的不足，设计多重组合式密封结构。该设计在单个密封圈密封结构的基础上，在活塞杆内侧设置两个起缓冲作用的密封圈，在缸底增加一个密封圈，构成多重组合式密封结构。通过有限元仿真，分析在均匀分布的不同压力下，单密封圈密封结构和多重组合式密封结构中的密封圈随着活塞杆往复运动时，密封圈的最大承载与受挤压形变，探究密封圈使用寿命和应力集中区域的变化。结果表明：多重组合式密封结构能够有效减小密封圈所承载的压力，密封圈使用过程中无明显挤压磨损现象，使用寿命延长，验证了多重组合式密封系统的有效性与可行性。

Design and Simulation Analysis on Multiple Combined Sealing Structure of Hydraulic Cylinder Used in Offshore Equipment

Aimed at the shortcomings that a single seal ring is easy to wear and cause seal failure,and the process of replacing the seal is difficult,a multiple combined sealing structure was designed.On the basis of the existing sealing structure with a single sealing ring,two cushioning sealing rings were arranged inside the piston rod,and a sealing ring was added at the bottom of the cylinder to form a multiple combined sealing structure.Through finite element simulation,the maximum bearing capacity and the extrusion deformation of the seal ring in the single sealing ring structure and multiple combined sealing structure were analyzed when the sealing ring moves with the piston rod reciprocating under uniformly distributed different pressures.The changes in the service life and stress concentration area of the seal ring were also explored.The results show that the multiple combined sealing structure can effectively reduce the pressure of sealing ring.The seal ring has no obvious extrusion wear during use,and its service life is extended,which verifies the effectiveness and feasibility of the multiple combined sealing system.