Ferrofluid seal with epoxy pole pieces

Details Ferrofluid seal with epoxy pole pieces Ferrofluid seal with epoxy pole pieces

1988-08-08

1990-05-22

Shoap, Allan N.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277135, F16J 1540

Patent

active

049271644

ABSTRACT:
In a ferrofluid seal which comprises a magnet and at least one pole piece, the pole piece is fabricated from a ferromagnetic material which directly bonds to the magnet face. Since the pole piece material directly bonds to the magnet, no additional adhesive is necessary. Thus, the conventional steps of applying an adhesive and mounting pole pieces on the magnet are eliminated. In addition, voids and bubbles in the adhesive are eliminated, thus, enhancing seal integrity.
In one embodiment, the ferromagnetic material is a ferromagnetic epoxy compound comprising a mixture of conventional epoxy materials plus a fine powder of ferromagnetic material such as iron, cobalt, nickel or various metal alloys.

REFERENCES:
patent: 3740060 (1973-06-01), Miskolczy et al.
patent: 4357021 (1982-11-01), Raj et al.
patent: 4357023 (1982-11-01), Yamamura
patent: 4407508 (1983-10-01), Raj et al.
patent: 4445696 (1984-05-01), Raj et al.
patent: 4762865 (1988-08-01), Gold

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