Positive drive compensating shaft seal

摘要

A compensating positive drive rotary shaft seal assembly comprises a two-part housing, each housing part including a radially directed stator surface surrounding the shaft. A collar is keyed to the shaft between the stators, and an axially shiftable rotor is interposed between the collar and each stator. The rotors are positively coupled to the collar for rotation with the shaft. An elastomeric annular seal is mounted on the shaft between each rotor and the collar. The housing parts are axially shiftable toward and away from each other adjustably to compress the elastomeric seals and yieldably bias the rotors against the stators. An internal annular gasket spanning the housing parts encompasses the seal assembly and defines a sealed chamber coupled to one or more purge ducts.