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研究了螺旋槽上游泵送机械密封的工作机理 ,分析了该密封端面间的液体运动规律并建立了用于计算机械密封端面内液体二元流动的雷诺方程。用有限元数值计算的方法得出了一定条件下螺旋槽上游泵送机械密封端面间液体的压力分布、开启力及上游泵送量等。计算结果表明 ,螺旋槽上游泵送机械密封端面液膜内的压力分布呈三维凸形曲面 ,该密封具有明显的流体动压效应 ,低压侧的流体向上游泵送到槽底直径处压力增至最大值。该密封稳定性较好 ,理论上能实现零泄漏
The working mechanism of pumping mechanical seal upstream of spiral groove was studied. The law of liquid movement between the sealed end faces was analyzed and a Reynolds equation was established to calculate the liquid binary flow in the end face of the mechanical seal. The pressure distribution, opening force and upstream pumping volume of the liquid between the end faces of pumping mechanical seals upstream of the spiral groove under certain conditions were obtained by means of finite element numerical calculation. The results show that the pressure distribution in the liquid film at the end face of the pumping mechanical seal upstream of the spiral groove is a three-dimensional convex curved surface, and the seal has a significant hydrodynamic pressure effect. The pressure of the fluid on the low pressure side is pumped to the bottom of the groove at the upstream pressure increases Maximum The seal stability is better, in theory, to achieve zero leakage