Seal assembly for rotating shafts
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United States of America Patent
Stats
-
Nov 8, 1983
Grant Date -
N/A
app pub date -
Dec 2, 1981
filing date -
Dec 5, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A seal assembly for rotating shafts particularly for sterntube seals for ps comprises two slide rings mounted in a receiving ring and pressed against a counter-ring by means of the surrounding sea-water. Between the slide rings an annular space is formed into which a liquid medium is let. The outer slide ring being a hydrostatic seal is lifted by the liquid medium in the annular space against the force of a spring in the receiving ring so that a small amount of the liquid medium leaks out to lubricate the slide rings and to prevent entering of abrasive particles. The inner slide ring is a hydrodynamic seal and is urged into contact with the counter-ring by the hydrostatic head of the sea-water surrounding the seal assembly. The receiving ring is guided in the housing or on the shaft with some clearance so that the faces of the slide rings can maintain a position parallel to the counter-ring.
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