Magnetic sealing device for use between first and second magneti

Details Magnetic sealing device for use between first and second magneti Magnetic sealing device for use between first and second magneti

1991-12-02

1992-11-10

Shoap, Allan N.

Bearings

Rotary bearing

Antifriction bearing

277 80, 277135, 384478, F16C 3382, F16J 1540

Patent

active

051619024

ABSTRACT:
Installed between a housing and a shaft concentrically disposed with a space having a predetermined radial length therebetween so as to move relative to one another is a sealing device which comprises a ferrofluid seal device comprising a permanent magnet and a pair of pole pieces for supporting the magnet interposed therebetween, so that a ferrofluid is retained between the pole pieces at one end thereof and the shaft and that a radially outer air gap is provided at least one of the pole pieces at the other end thereof and the housing, whereby the magnetic flux path extending between the pole pieces at the other end thereof and the housing is eliminated.

REFERENCES:
patent: 2974981 (1961-03-01), Vervest et al.
patent: 4293137 (1981-10-01), Ezekiel
patent: 4340233 (1982-07-01), Yamamura et al.
patent: 4407508 (1983-10-01), Raj et al.
patent: 4506895 (1985-03-01), Raj
patent: 4526381 (1985-07-01), Ezekiel
patent: 4628384 (1986-12-01), Raj et al.
Japanese Utility Model Publication No. 61-79070.
Japanese Utility Model Publication No. 58-191423.
Japanese Utility Model Publication No. 61-13025.
Japanese Utility Model Publication No. 62-204027.
Japanese Utility Model Publication No. 63-8419.
Japanese Utility Model Publication No. 63-139325.
Japanese Utility Model Publication No. 63-29944.

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