Magnetic seal with magnetic powder held in pole piece gap

Details Magnetic seal with magnetic powder held in pole piece gap Magnetic seal with magnetic powder held in pole piece gap

1981-11-12

1983-06-07

Ward, Jr., Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 53, 415172R, 415174, F16J 1540, F16J 1516

Patent

active

043867847

ABSTRACT:
A seal for use in rotating machinery such as a gas turbine engine comprises two pole pieces attached to the engine casing and defining a gap in which a magnetic powder is held by a magnetic field generated by a permanent magnet, electro-magnet or a combination of the two. The non-magnetic fins of the adjacent rotor (e.g. turbine blades), extend into the gap and distort the magnetic field so that while there is a small clearance between the fin and the powder, this small clearance can be maintained approximately the same whatever the position of the fin in the gap. A seeding tube allows magnetic powder to be supplied to the gap to make good any loss of powder.

REFERENCES:
patent: 2834618 (1958-05-01), Wiltse
patent: 3097853 (1963-07-01), McHugh
patent: 4057362 (1977-11-01), Schwaebel
patent: 4304411 (1981-12-01), Wilcock et al.

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