Shaft seal with positively magnetically controlled sealing gap

Details Shaft seal with positively magnetically controlled sealing gap Shaft seal with positively magnetically controlled sealing gap

1983-06-01

1984-05-08

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 26, 277 38, 277 81R, 277901, 277 28, F16J 1554

Patent

active

044470630

ABSTRACT:
In a shaft seal having a radial plane seal ring gap and comprising a seal ring rotating with a shaft, and a non-rotating seal ring mounted on a housing of the seal through an element which is elastically yielding in every direction and serves as a packing at the same time, the sealing fluid flows into the sealing gap through supply bores and through associated distributing pockets which are provided in the non-rotating seal ring and/or at the outer or inner circumference of the rotating seal ring. Sensors for measuring the sealing gap are provided in the non-rotating seal ring on the gap side. By means of the measured values, electromagnets disposed in the seal housing to face each other and cooperating with opposite magnetizable bodies provided in the non-rotating seal ring, are electronically controlled to maintain a predetermined constant small width of the seal gap. The electromagnets are disposed axially at both sides of a shoulder portion of the non-rotating seal ring to be effective in opposite directions, against each other.

REFERENCES:
patent: 3025070 (1962-03-01), Copes
patent: 3170409 (1965-02-01), McLeod et al.
patent: 3708177 (1973-01-01), Baermann

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