上游泵送+螺旋阻塞+唇片组合式机械密封设计

The Research on Upstream Pumping Mechanical Seal,Spiral Barrage Thrust,and Lip Mechanical Seal

上游泵送机械密封是全液膜非接触式机械密封,近年来在化工流体输送中得到推广应用。与传统接触式密封相比,流体动压产生的效应使上游泵送机械密封端面形成全液膜,液膜压力高于介质压力,实现用低压流体阻封高压流体。上游泵送机械密封高速旋转时,端面开启,处于非接触状态,可极大提高机械密封的使用寿命,实现被密封高黏度介质的零泄漏。为满足高黏度浆料介质的密封需求,以上游泵送机械密封代替普通接触式密封作为主密封,以螺旋阻塞及唇片密封作为副密封,设计了一种组合式机械密封。介绍了组合式机械密封的结构特点、设计参数,计算了组合式机械密封的泄漏量,并通过运转试验进行验证。设计的组合式双端面机械密封在某ABS胶乳装置中得到应用,密封效果良好。

Upstream pumping mechanical seal is a kind of full-fluid film non-contact seal,which has been applied to use on pumping chemical fluid in recent years.Compared with general contact type seal,influence issued from hydrodynamic pressure to have full-fluid film for seal faces of upstream pumping mechanical seal.The pressure of fluid film higher than the side of medium.When upstream pumping mechanical seal run at high speed,seal faces open to be in non-contact state.It could improve the working life of mechanical seal and achieve zero leakage of sealed medium.To meet the sealing requirement of high viscosity slurry medium,upstream pumping mechanical seal was taken to replace general contact type seal as the main seal.Spiral barrage and lip seal were taken as secondary seal to design a cartridge seal.Structure characteristic and design data for cartridge mechanical seal were introduced.The leakage value of cartridge seal was calculated and proved by running test.The design of double-faced cartridge mechanical seal has good performance in application of ABS latex equipment.