Plural fluid magnetic/centrifugal seal

Details Plural fluid magnetic/centrifugal seal Plural fluid magnetic/centrifugal seal

1980-08-19

1982-06-22

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 80, 277135, F16J 1542, F16J 1556

Patent

active

043358853

ABSTRACT:
A plural fluid magnetic/centrifugal-fluid seal is provided for hermetically sealing the space between a rotated shaft member and a close fitting spaced-apart stationary housing wherein the housing and the shaft are shaped to provide magnetic pole-like close clearance gap regions between their opposed surfaces. A high viscosity ferromagnetic fluid normally is disposed in the magnetic gap region with the rotating shaft member at rest and at low rotational speeds. A permanent magnet or electromagnet is provided which forms a closed magnetic circuit through the magnetic gap region with the high viscosity ferromagnetic fluid. A circumferentially arranged centrifugal seal forming region is radially disposed outward from the magnetic gap region and is located between the rotatable shaft and the stationary housing member. A low viscosity centrifugal sealing fluid is disposed in the centrifugal seal forming region and is centrifugally thrown outwardly during high speed rotation of the rotating shaft member to form a centrifugal hermetic seal between the rotating shaft member and the housing at high rotational speeds of the rotating member.

REFERENCES:
patent: 3468548 (1969-09-01), Webb
patent: 3968969 (1976-07-01), Mayer et al.
patent: 4054293 (1977-10-01), Hoeg
patent: 4200296 (1980-04-01), Stahl et al.

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