压裂泵柱塞密封副有限元分析

FINITE ANALYSIS OF PLUNGER - SEAL PAIR IN FRACTURING PUMP

用有限单元法对ＯＰＩ－ １８００ＡＷＳ型压裂泵柱塞密封副进行了有限元分析，获得了橡胶密封圈与柱塞之间接触应力的分布规律以及接触应力与工作介质压力的关系。计算表明：橡胶密封圈在工作介质压力的作用下，有“偏离效应”的存在。即在密封圈的接触宽度上，唇部受拉伸，根部受压缩，主密封在靠近唇部位置；同时，主密封带的位置不随介质压力的变化而变化，且最大接触应力与工作介质压力之比为１ ．２３ 。所有这些为润滑状态和密封机理的分析提供了计算依据，同时为密封圈结构设计提供了新的认识和理论依据。

Based on the finite element method, the contact stresses of the plunger-seal pair of OPI-1800AWS fracturing pump were discussed in detail. The paper presented distribution law of contacting stress between plunger and rubber seal ring, and also analyzed the relationships between contacting stress and working pressure. Under the action of working medium pressure, it indicates the “centripetal effect” in rubber seal ring exists. i.e., along the contacting length of seal ring, the lip of seal ring is extended, the root of seal ring is compressed, and the main sealing region is near the lip. At the same time, the position of the main seal region does not vary with the medium pressure, and the ratio of the maximum contacting pressure to the working medium pressure is 1.23. Finally it provides the theoretical support for the analysis of lubrication and seal mechanism.