Shaft seal assembly

Details Shaft seal assembly Shaft seal assembly

1975-10-03

1976-06-08

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

74493, 277 75, 308 9, F16J 1550

Patent

active

039617980

ABSTRACT:
A fluid-to-fluid shaft seal assembly including at least one pressure breakdown bushing within the sealing region encompassing the shaft of a rotary machine and being loosely housed within the machine frame. The bushing includes an inwardly extended arm passing downwardly into an undercut formed within the shaft. A balancing ring extends between the arm and one wall of the stator opening. The ring is strategically located in respect to the bushing whereby the forces exerted upon the bushing by the sealing fluid are pressure balanced to permit the bushing to move freely in a radial direction to comply with the shaft as the shaft deflects and thus prevent the bushing from locking against the machine frame.

REFERENCES:
patent: 3315968 (1967-04-01), Hanlon
patent: 3334906 (1967-08-01), Arnold
patent: 3456992 (1969-07-01), Kulina
patent: 3695621 (1972-10-01), Damratowski et al.
patent: 3695627 (1972-10-01), Bichel et al.
patent: 3874676 (1975-04-01), Taylor

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