Magnetic fluid sealing device

Details Magnetic fluid sealing device Magnetic fluid sealing device

1991-10-21

1993-06-01

Pianalto, Bernard

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 961, 277133, E21B 3300, F16J 900

Patent

active

052153134

ABSTRACT:
A magnetic fluid sealing device is provided for sealing a gap between a first member and a second member movable relative to each other. The device has a magnetic fluid and a magnet for retaining the magnetic fluid in the gap. A two-dimensionally bonded monomolecular layer is formed as an oil-repelling layer from a coupling agent on at least an intermediate surface area of at least one of the first and second members, which intermediate surface area is located between a fluid-deposited surface area and a fluid-free surface area.

REFERENCES:
patent: 3818074 (1974-06-01), Ahlbrecht et al.
patent: 4486026 (1984-12-01), Furumura et al.
patent: 4786658 (1988-11-01), Hashimodo et al.
Bosei Kanri (Rust Prevention and Control), 23, 11-22 (Jul., 1979).
U.S. patent application Ser. No. 07/527,909, Yokouchi et al.
Kenjiro Meguro and Kunio Esumi: "Nureno Kiso to Oyo (Fundamental and Application of Wetting)" 108-109 & Reference 4, K.K. Realizesha (Dec. 20, 1989).
Junjiro Aoki: "Kappuringuzai-Saiteki Riyo Gijutsu (Coupling Agents-Optimal Application Technology)", 140-143, K. K. Kagaku Gijutsu Sogo Kenkyusho (Feb. 25, 1988).
Products Information: Fluoroalkylsilanes, Toshiba Silicone Co., Ltd. (Nov., 1985).

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