Magnetic fluid seal device

Details Magnetic fluid seal device Magnetic fluid seal device

1989-04-26

1990-11-27

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277135, F16J 1540

Patent

active

049730649

ABSTRACT:
A magnetic fluid seal device, which comprises a seal member constituting of two ring-shaped pole pieces attached to the poles of a permanent magnet, a rotor disposed with a gap for the seal member in between, and magnetic fluid magnetically kept in the aforementioned gap. The magnetic fluid is magnetically maintained through a groove defined by the inside faces of the two ring pole pieces and the peripheral surface of the ring magnet, and the distance of the groove on one side of the two ring pole pieces keeping the magnetic fluiid is made smaller than the thickness of the ring magnet at a place on its other side not keeping the magnetic fluid, thus ensuring the magnetic fluid to be injected into the two gaps and the device to be effectually sealed by the two-stage closely adjacent fluid seals formed.

REFERENCES:
patent: 4171818 (1979-10-01), Moskewitz et al.
patent: 4357021 (1982-11-01), Raj et al.
patent: 4444398 (1984-04-01), Black, Jr. et al.

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