Device for sealing a propeller shaft against invasion of sea water
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United States of America Patent
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-
Mar 13, 1984
Grant Date -
N/A
app pub date -
Apr 30, 1982
filing date -
Apr 30, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A sealing device for a ship's propeller shaft installed around the propeller shaft in which longitudinally spaced annular iron pole blocks, and circularly spaced permanent magnets fixed between the blocks are mounted in a cylindrical housing surrounding the propeller shaft, and a magnetic fluid fills gaps between the magnets and the annular iron pole blocks and either a liner mounted about the shaft or the shaft itself. The magnetic fluid serves as a sealant and completes a magnetic circuit which maintains a well defined thickness of magnetic fluid sealant and a high pressure seal even under great mechanical stress, thereby minimizing frictional power loss and wear to the propeller shaft or sleeves which are conventionally shrink-fitted thereto.
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