Seal/bearing assembly
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United States of America Patent
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Oct 27, 1998
Grant Date -
N/A
app pub date -
Dec 19, 1996
filing date -
Jun 20, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
For fitment into the stuffing box of a centrifugal pump. A spiral-groove is cut on the outer surface of the rotor of a pair of tapered bearing surfaces. The groove is 0.02 mm deep, 2 mm wide, and its circumferential length is 50 cm. Barrier-liquid is fed to an entry-mouth of the spiral-groove, and groove generates a pressure in the stuffing box high enough to overcome process pressure. The barrier-liquid may be water. The interface between the bearing surfaces is sealed from the process-fluid and from the outside.
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