Sealing apparatus for rotating shafts, in particular stern tube seal for the propeller shaft of a ship
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United States of America Patent
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-
Dec 7, 1993
Issued Date -
N/A
app pub date -
May 22, 1992
filing date -
Sep 5, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A sealing apparatus for rotating shafts, in particular a stern tube seal for a propeller shaft of a ship with or without shaft bushings, with aligned gaskets resting on the shaft and located in a stationary support system, preferably of an axial face seal, and with a backup seal located in the support system, which is designed as a gland seal with soft packings, and a gland which can be moved in the axial direction in a guide body connected to the support system, whereby between the guide body and the gland there is a cavity system, into which, when there is a failure of the main seal, a hydraulic or pneumatic pressure medium can be introduced, which activates the backup seal, is characterized by the fact that the cavity system consists of a number of individual piston-cylinder units uniformly distributed over a circle which is concentric with the shaft axis, corresponding to each of which there is a branch current of the hydraulic or pneumatic pressure medium.
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