Shaft sealing assembly and compressor incorporating the same

摘要

A shaft sealing assembly for a compressor includes first and second lip rings (35,37), each of which is disposed around a shaft (16) of a compressor to provide sealing. A retainer ring (36) is disposed between the two lip rings to retain the shape of the first lip ring (35), which serves to allow leakage of fluid when the shaft (16) rotates and prevent the leakage when the shaft (16) is stopped. The three rings (35,36, and 37) are held together at the radial portions of the rings (35b, 36a, and 37e). Each of the radial portions of the two lip rings extends outwardly beyond the radial portion of the retainer ring, providing an annular contact area. The two lip rings (35,37) resiliently contact one another in the contact area. An annular projection (43) is provided on at least one of the lip rings in the contact area to prevent the loosening of the rings caused by the leaked fluid.