Device for sealing a propeller shaft against invasion of sea wat

Details Device for sealing a propeller shaft against invasion of sea wat Device for sealing a propeller shaft against invasion of sea wat

1982-04-30

1984-03-13

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277135, 277DIG8, F16J 1554, F16J 1540

Patent

active

044363133

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.

REFERENCES:
patent: 3388913 (1968-06-01), Tracy
patent: 3545770 (1970-12-01), Wheelock
patent: 3612549 (1971-10-01), Berkowitz
patent: 3620584 (1971-11-01), Rosenzweig
patent: 4252353 (1981-02-01), Raj et al.

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