Air purged shaft seal assembly

Details Air purged shaft seal assembly Air purged shaft seal assembly

F - Mech Eng,Light,Heat,Weapons

16

J

F16J 15/54 (2006.01) F16J 15/18 (2006.01)

Patent

CA 2371574

An air purged shaft seal assembly has a seal housing fixedly securable to a stationary support and having a circular aperture through which a shaft can pass. The seal housing has an internal annular surface defining the circular aperture, the internal annular surface having a first annular portion for engaging an outer surface of an annular sealing member and a second annular portion shaped to partially form an air receiving chamber. The seal housing has a passage for supplying air under pressure from an external source thereof to the air receiving chamber. A sleeve mountable on the shaft for sliding movement therealong, the sleeve having an external peripheral surface with a first peripheral portion co-operable with the first annular portion of the internal annular surface of the seal housing to receive the annular sealing member therebetween and a second peripheral portion co-operable with the second annular portion of the internal annular surface of the seal housing to form the air receiving chamber. A shaft collar surrounds and is fixedly securable to the shaft. Sleeve adjustment means carried by the shaft collar is operable to enable the sleeve to be moved longitudinally on the shaft to adjust the distance between a portion of the seal housing and a portion of the sleeve adjacent the air receiving chamber to provide an adjustable annular gap therebetween to enable air under pressure to escape from the air receiving chamber and prevent foreign matter from passing into the air receiving chamber between the portions of the seal housing and the sleeve adjacent thereto.

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