Coaxial, multiple-shaft ferrofluid seal apparatus

Details Coaxial, multiple-shaft ferrofluid seal apparatus Coaxial, multiple-shaft ferrofluid seal apparatus

1984-11-20

1986-03-11

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277135, F16J 1540

Patent

active

045751021

ABSTRACT:
A compact, coaxial multiple-shaft ferrofluid seal apparatus which comprises: a housing; a central shaft and magnetically permeable coaxial shafts about the central shaft, the coaxial shafts having a pair of spaced apart nonmagnetically permeable insulator shaft sections; magnetically permeable bearings to support each shaft; pole piece elements to provide radial gaps within the inner or outer shaft surfaces; ferrofluid disposed in the radial gaps to provide a seal apparatus for the shafts of designed pressure capacity; and a single radially polarized permanent magnet to provide a source of magnetic flux for the seal apparatus.

REFERENCES:
patent: 3740060 (1973-06-01), Miskolczy et al.
patent: 4304411 (1981-12-01), Wilcock
patent: 4506895 (1985-03-01), Raj et al.
patent: 4527805 (1985-07-01), Gowda et al.

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