大尺寸O形丁腈橡胶圈动密封性能测试分析

Test and Analysis of Dynamic Sealing Performance of Large Size O-shaped Nitrile Rubber Ring

为研究大尺寸O形橡胶密封圈端面动密封性能,研制适应于大尺寸O形橡胶圈的动密封性能测试平台,测试水介质条件下绝对压力在15~600 kPa范围内O形橡胶密封圈端面动密封性能。基于正交试验设计,研究不同介质压力、压缩量(0.75~1.25 mm)和转速(5~50 r/min)下内径600 mm(截面直径10 mm)的丁腈橡胶密封圈的动密封性能。结果表明:随水介质压力增加泄漏量呈近似线性增大,随压缩量增加泄漏量小幅下降,随转速增加泄漏量基本恒定;随水介质压力增加端面摩擦转矩线性增大,随转速和压缩量增加端面摩擦转矩变化不大。介质压力、压缩量、转速3因素中,介质压力对泄漏量的影响最大,然后依次为压缩量和转速,介质压力对端面摩擦转矩的影响最大,然后依次为转速和压缩量。

In order to study the dynamic sealing performance of large-size O-shaped rubber seal ring,a dynamic sealing performance test platform for large-size O-shaped rubber was developed,and the dynamic sealing performance of O-shaped rubber seal ring was tested at the pressure from 15 kPa to 600 kPa under the condition of water medium.Based on orthogonal experimental design,the dynamic sealing performances of nitrile rubber seal ring with inner diameter of 600 mm(section diameter of 10 mm)under different medium pressure,compression(from 0.75 mm to 1.25 mm)and rotating speed(from 5 r/min to 50 r/min)were studied.The results show that the leakage of the seal ring increases approximately linearly with the increase of water medium pressure,decreases slightly with the increase of compression,and is basically constant with the increase of rotating speed.The end face friction torque increases linearly with the increase of water medium pressure,and changes little with the increase of rotating speed and compression.Among the three factors of medium pressure,compression and speed,the medium pressure has the greatest influence on the leakage,followed by compression and speed.The medium pressure has the greatest influence on the end face friction torque,followed by speed and compression.