Expansible chamber devices – With non-sealing cleaning means
Patent
1990-10-16
1992-09-08
Look, Edward K.
Expansible chamber devices
With non-sealing cleaning means
92168, 277 24, 417489, F01B 3100, F16L 1700
Patent
active
051448823
ABSTRACT:
A piston pump shaft sealing system is provided which prevents particles released from the shaft seal, as a result of wear from entering and contaminating the fluid being pumped. The system features a permeable, deformable disc disposed between the seal and the displacement chamber of the pump. The piston shaft extends through a centrally exposed hole in the disc. In its undeformed state, the hole in the disc is smaller than the diameter of the piston shaft so that when the shaft is forced through the hole, the edges of the hole are pressed against the surface of the shaft, thereby scraping off seal particles deposited on the shaft. Forcing the shaft through the hole also deforms the disk into a conical shape, thereby forming an annular cavity between the disc and the seal which surrounds the piston shaft. The cavity serves to capture and retain the sealed particles, thereby preventing them from entering the fluid. The disc is permeable with respect to the fluid, thereby ensuring rapid wetting of the seal area at pump startup, rapid flushing of the seal system following change over of the fluid, and minimizing the pressure differential across the disc.
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O+P Olhydraulik und Pneumatik, 31 (May 1987), Nr. 2, p. 121.
Hewlett--Packard Company
Look Edward K.
Ryznic John
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