Magnetic fluid sealing device

Details Magnetic fluid sealing device Magnetic fluid sealing device

1996-11-19

1999-03-02

DePumpo, Daniel G.

Seal for a joint or juncture

Seal between relatively movable parts

Close proximity seal

277302, F16J 1540

Patent

active

058760377

ABSTRACT:
A magnetic fluid sealing device for preventing magnetic fluid from flowing out or spattering under the influence of rotation of a rotatable shaft, thereby preventing contamination of the surroundings. The device includes a pole piece 1 formed with a step portion 13 whose front end surface 4 is disposed more inwardly than the proximal end surface, and the surface of the step portion 13 opposed to a magnetic body 6 serves as a barrier wall 10. Thereby, magnetic fluid 7 is prevented from flowing out or spattering into the surroundings.

REFERENCES:
patent: 4357024 (1982-11-01), Raj
patent: 4444398 (1984-04-01), Black, Jr. et al.
patent: 4973064 (1990-11-01), Hosaya
patent: 5009436 (1991-04-01), Endo et al.
patent: 5118118 (1992-06-01), Tadi et al.
patent: 5161902 (1992-11-01), Fujii
patent: 5215313 (1993-06-01), Yokouchi et al.
patent: 5267737 (1993-12-01), Cossette et al.

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