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

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

F - Mech Eng,Light,Heat,Weapons

16

J

277/11

F16J 15/40 (2006.01) F16J 15/43 (2006.01)

Patent

CA 1239161

ABSTRACT OF THE DISCLOSURE 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.

443394

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