Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1985-02-07
1986-06-03
Smith, Robert I.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277135, F16J 1554
Patent
active
045925577
ABSTRACT:
A ferrofluid rotary-shaft seal apparatus of extended seal life suitable for use as an exclusion seal in vacuum or other demanding applications which seal apparatus comprises:
(a) an annular permanent magnet adapted to surround the rotary shaft to be sealed and having poles of opposite polarity at each end; and
(b) a series of spaced magnetically permeable, pole-piece elements in a magnetic-flux relationship with the one and other ends, respectively, of the permanent magnet, each pole piece having a one end and another end and adapted to surround the rotary shaft to be sealed and to form a cavity there between, the inside diameter surfaces of the stationary magnetically permeable pole piece elements comprising a plurality of spaced magnetic pole piece elements each of which acts as a separate path for magnetic flux there being ferrofluid magnetically captured between the inside diameter of each circular pole piece said ferrofluid breaching the small gap between the inside diameter of said circular pole piece and the concentrically mounted rotating magnetic shaft, there being a plurality of ferrofluid stages, sufficient to withstand needed pressure differentials.
REFERENCES:
patent: 3700248 (1972-10-01), Teske et al.
patent: 3746407 (1973-07-01), Stiles
patent: 4514987 (1985-05-01), Pundak et al.
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