齿形滑环密封圈密封性能分析及结构改进  

Sealing Performance and Structural Improvement of Tooth Slip Ring Sealing Ring

作　　者：邓尧曦 王正隆 DENG Yao-xi;WANG Zheng-long(CHN ENERGY Dadu River Hydropower Development Co.,Ltd.,Chengdu 610095,China;CHN ENERGY Dadu River Maintenance and Installation Co.,Ltd.,Leshan 614900,China)

机构地区：[1]国能大渡河新能源投资有限公司,四川成都610095 [2]国能大渡河检修安装有限公司,四川乐山614900

出　　处：《液压气动与密封》2022年第5期100-106,共7页Hydraulics Pneumatics & Seals

基　　金：四川省教育厅自然科学基金重点项目(13ZA0178)。

摘　　要：建立了齿形滑环密封结构数值计算模型,采用有限元方法分析O形密封圈和滑环的接触应力和应力分布,并探讨介质压力、往复速度、摩擦系数和压缩量对密封性能的影响。结果表明,在静密封阶段,O形密封圈横截面内部应力集中在靠近凹槽底部区域,滑环足部与中间接触部位的变形严重。随着压缩量、介质压力的增加,齿形滑环密封圈密封性能和变形增加,摩擦因数对接触应力影响较小。在动密封阶段,接触应力上下波动,接触应力随压缩量、摩擦因数、往复运动速度的变化无明显规律;通过增加介质压力,可有效提高动态密封性能。针对密封圈发生材料疲劳失效的现象,采用将滑环的唇口设计为直径依次增大的半圆弧的改进方案,改进后的密封圈密封性能提高,适合高压工况。Establish a numerical calculation model of the toothed slip ring seal structure, use the finite element method to analyze the contact stress and stress distribution of the O-ring seal and the slip ring, and discuss the effect of compression, medium pressure, friction coefficient and reciprocating speed on deformation and sealing performance Impact. The results show that, in the static sealing stage, the internal stress of the O-ring cross-section is concentrated in the area near the bottom of the groove, and the slip ring foot and the middle contact part are deformed seriously. As the amount of compression and medium pressure increase, the sealing performance and deformation of the toothed slip ring seal ring increase, and the friction factor has less influence on the contact stress. In the dynamic sealing stage, the contact stress fluctuates up and down, and the contact stress does not change with the amount of compression, friction factor, and reciprocating speed. The dynamic sealing performance can be effectively improved by increasing the medium pressure. In view of the material fatigue failure of the sealing ring, an improved scheme is adopted to design the lip of the slip ring as a semicircular arc with increasing diameter. The improved sealing performance of the sealing ring is improved, and it is suitable for high-pressure working conditions.

关 键 词：齿形滑环密封圈 密封性能 结构改进 接触应力 

分 类 号：TB42[一般工业技术]