基于MATLAB的混合摩擦工况下机械密封动态特性研究

Analysis on Transient Operation of Mechanical Seal in the Mixed Lubrication Using MATLAB

考虑机械密封动环和静环端面的粗糙度,同时考虑动环和静环端面摩擦生热和两端面间液膜的粘性热作用,建立了混合摩擦工况下机械密封的数学模型,并结合ANSYS与MATLAB软件对模型进行求解。结果表明:机械密封在启动过程中密封端面内侧温度不断升高,热膨胀作用使得接触压力逐渐增大;外侧温度也有所增加,但增加的速度较内侧慢,内外侧的温差逐渐增大;液膜厚度由内向外逐渐变大,总的液膜力逐渐增大,而总的接触力逐渐变小,接触区域也随之减小,当密封环达到热量平衡时,机械密封也达到平衡状态。

To consider the roughness of surface of the rotor and stator of mechanical seal, the frictional heat and viscous heat between rotor and stator, a mixed lubrication theoretical model of mechanical seal was built, the model was computed combined the software ANSYS and MATLAB. The results show that the temperature of the inner side increases gradually and the contact pressure increases because of the heat expansion during the start up of the seal ; the temperature of the outer side increases also but slowly than that in the inner side, and the temperature difference between inner side and outer side increases gradually ; the film thickness increases from inner to outer side, and the total film pressure inereses, the total contact force and the area of contact decrease;when the seal ring reaches heat balance, the seal comes to an equilibrium.