Ferrofluid linear seal apparatus

Details Ferrofluid linear seal apparatus Ferrofluid linear seal apparatus

1984-05-03

1985-03-05

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277135, 277DIG8, F16J 1540, F16J 1556

Patent

active

045027005

ABSTRACT:
A ferrofluid linear seal apparatus to provide a hermetic seal about a shaft engaged in linear motion between a first and second environment, typically between a vacuum atmosphere and atmospheric pressure, which seal apparatus comprises: a housing for a shaft element; a nonmagnetically permeable shaft element adapted for linear motion within the housing; an annular permanent magnet about the shaft element; an annular magnetically-permeable pole piece about the shaft element, the outer diameter of the pole piece extending into a close, noncontacting relationship with the inner diameter of the housing to form a plurality of separate spaced-apart radial gaps; ferrofluid retained in the radial gaps by the magnetic flux of the permanent magnet; and linear bearings to provide support for the linear movement of the shaft element within the housing.

REFERENCES:
patent: 3020582 (1962-02-01), Roach et al.
patent: 3620584 (1971-11-01), Rosenzweig
patent: 4284605 (1981-08-01), Pierrat

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