Variable friction secondary seal for face seals

Details Variable friction secondary seal for face seals Variable friction secondary seal for face seals

1984-11-16

1986-04-08

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 28, F16J 1534

Patent

active

045807914

ABSTRACT:
Vibration and stability of a primary seal ring 18 is controlled by a secondary seal system 24. An inflatable bladder 26 which forms a portion of secondary seal varies the damping applied to this seal ring.
The amplitude of vibration of the primary seal ring 18 is sensed with a proximity probe 34 that is connected to a microprocessor in a control system 32. The bladder pressure is changed by the control system 32 to mitigate any sensed instability or vibration.

REFERENCES:
patent: 3330563 (1967-07-01), DePuydt et al.
patent: 4103903 (1978-08-01), Capriotti et al.
patent: 4193756 (1978-03-01), Leon
patent: 4351574 (1982-09-01), Furukawa et al.
patent: 4408767 (1983-10-01), Kako
patent: 4447063 (1984-05-01), Kotzur et al.
patent: 4471964 (1984-09-01), Kotzur
patent: 4483541 (1984-11-01), DeVenyi et al.
patent: 4529209 (1985-07-01), Nii

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