介质温升对流体静压型机械密封性能影响的研究

Study on Effect of Medium Temperature Rising on Sealing Performance of Hydrostatic Mechanical Seals

以抛物线型流体静压型机械端面密封(PHS-MS)为研究对象,建立了PHS-MS流体润滑理论模型,考虑流体液膜粘温压效应,采用有限差分法对广义Reynolds方程、能量方程、热传导方程组成的耦合数学模型进行了数值计算,获得了介质温升对PHS-MS密封性能影响规律。结果表明,介质温升使PHS-MS的端面开启力先增大后减小,泄漏率增大,而摩擦力减小,并随着时间推移各项密封性能参数趋向稳定;当介质温升较快时,开启力、泄漏率增大及摩擦力减小的趋势快,但密封性能参数达到的稳定值不变。

Aiming at a hydrostatic mechanical seal with parabola face（ PHS-MS）,a theoretical model of fluid lubrication is presented. Considering the relation between the fluid viscosity and the temperature,pressure,the finite difference method is used to solve coupling mathematical model which includes the generalized Reynolds equation,the energy equation and the thermal conduction equation. The effects of temperature rising of fluid on the sealing performance of PHS-MS are studied. The results show that when medium temperature increases,the opening force will firstly increase and then decrease,the leakage will increase,while the friction force will decrease. All the sealing performance parameters will be stable at last. The more quickly the medium temperature rises,the more rapidly the opening force and the leakage rate increase,the friction force is on the contrary,but the final values of the sealing performance are uninfluenced.