Self-activating ferrofluid seals

Details Self-activating ferrofluid seals Self-activating ferrofluid seals

1979-04-26

1981-02-24

Ward, Jr., Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277135, F16J 1516, F16J 1540

Patent

active

042523532

ABSTRACT:
A self-activating seal is formed by inserting a magnetically permeable shaft into a module which comprises: a magnet, two pole pieces and a magnetic fluid. The module is so constructed that the magnet and pole pieces form a cavity for storing the magnetic fluid until the shaft or similar element is inserted. Upon insertion of the shaft, the magnetic field is altered and the flux path diverted to the small gaps separating the pole pieces and the shaft. The magnetic fluid is drawn to the gas to form hermetic seals.

REFERENCES:
patent: 2996162 (1961-08-01), Lehde
patent: 3740060 (1973-06-01), Miskolczy et al.
patent: 3746407 (1973-07-01), Stiles et al.
patent: 4171818 (1979-10-01), Moskowitz et al.
Machine Design, issue of Mar. 28, 1968, "Magnetic-Fluid Seals," Rosensweig et al., pp. 145-150.

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