针对深海装备在深海高压环境下安全稳定运行的需要，以深海高压环境下的组合密封结构为对象，利用ABAQUS有限元分析软件建立组合密封结构轴对称有限元模型，分析了不同O形圈的材料硬度对组合密封结构性能的影响规律。结果表明： O形圈的最大Von Mises应力随着材料硬度增加而逐渐减小，但O形圈及滑环各密封唇口的最大接触压力均随着材料硬度增加而逐渐增大。当材料硬度较低时，O形圈被挤入滑环与沟槽之间的间隙内，从而出现“尖角”现象致使密封失效。研究结果为深海高压环境下的组合密封结构材料的优选以及优化设计等提供理论基础和技术支撑。

In order to meet the need of safe and stable operation of deep-sea equipment under the special working conditions of deep-sea high pressure, with the combined seal structure under deep-sea high-pressure environment as the object, the axial symmetry finite element model of the combined seal structure is established by the ABAQUS finite element analysis software, and the influence of the material hardness of different O-ring seals on the performance of the combined seal structure is analyzed. The results show that the maximum Von Mises stress of the O-ring decreases with the increase of the material hardness, but the maximum contact pressure of each sealing lip of the seal ring and the slip ring gradually increases as the material hardness increases. When the O-ring material has a low hardness, the O-ring will be squeezed into the gap between the slip ring and the groove, causing a “sharp angle” phenomenon, which in turn causes the seal structure to fail. The research results provide theoretical basis and technical support for the optimization of combined seal structural materials and the optimal design of seal structures in deep-sea high-pressure environment.