System for sealing shafts against solid containing gaseous media

摘要

A system of sealing a shaft from a wearing gaseous compressed medium includes a sealing box arranged on a shaft, a source of scavenging gas, a lubricating element which communicates with the source of scavenging gas so that a lubricant in the lubricating element is under a pressure of scavenging gas higher than a medium pressure in a medium chamber and is supplied to the sealing box, and a throttling element for throttling a portion of scavenging gas from the source and supplying the throttled portion of the scavenging gas into the region of the sealing box.