Single-pole-piece ferrofluid seal apparatus and exclusion seal s

Details Single-pole-piece ferrofluid seal apparatus and exclusion seal s Single-pole-piece ferrofluid seal apparatus and exclusion seal s

1982-12-16

1983-10-04

Ward, Jr., Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 80, 277135, F16J 1540

Patent

active

044075081

ABSTRACT:
A single-pole-piece ferrofluid exclusion seal apparatus and exclusion seal system which comprises a single, annular pole piece to surround a shaft element to be sealed, and an annular permanent magnet secured to one surface of the pole piece in a magnetic-flux relationship, the single pole piece having a one end which extends into a close, noncontacting relationship with the surface of the shaft element to be sealed, to define a small radial gap between the surface of the shaft element and the one end of the pole piece, and a ferrofluid positioned within the radial gap, to provide a ferrofluid seal with the shaft element, the ferrofluid comprising a high magnetization-type ferrofluid, with the magnetic flux path of the single-pole-piece ferrofluid seal extending between the shaft, the ferrofluid in the radial gap, the single pole piece in the permanent magnet and the air gap between the magnet and the shaft.

REFERENCES:
patent: 2996162 (1961-08-01), Lehde
patent: 3620584 (1971-11-01), Rosenzweig
patent: 3814443 (1974-06-01), Steigerwald
patent: 4171818 (1979-10-01), Moskowitz et al.
patent: 4335885 (1982-06-01), Heshmat
patent: 4357023 (1982-11-01), Yamamura

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