Shaft seal device

Details Shaft seal device Shaft seal device

1993-08-05

1995-06-06

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 41, 277 74, 277 93R, F16J 1534

Patent

active

054215935

ABSTRACT:
A shaft seal device comprises two mechanical seals for sealingly separating a sealed fluid region from an atmospheric region. A shaft is rotatable about an axis and extends through a casing from a sealed fluid region to an atmospheric region. The mechanical seals separate the sealed fluid region and the atmospheric region by a purge region formed between the mechanical seals. Each mechanical seal comprises a first seal ring fixed on the shaft and a second seal ring slidable in the axial direction and pressed against the first seal ring. The mechanical seal separating the sealed fluid region from the purge region is a contact type seal so that the fluid pressure of the sealed fluid region acts as a back pressure on the second seal ring. The mechanical seal separating the atmospheric region from the purge region is non-contact type seal so that the fluid pressure of the purge region acts as a back pressure on the second seal ring. The purge fluid region is charged with a gas such as nitrogen at a pressure lower than the pressure in the sealed fluid region.

REFERENCES:
patent: 2854927 (1958-10-01), Berg
patent: 3199145 (1965-08-01), Tiemersma
patent: 3582089 (1971-06-01), Amorese
patent: 3770179 (1973-11-01), McHugh
patent: 3811687 (1974-05-01), Honold et al.
patent: 4095806 (1978-06-01), Dempsey
patent: 4130287 (1978-12-01), Ritzie
patent: 5058905 (1991-10-01), Nosowicz et al.
patent: 5066026 (1991-11-01), Heck et al.
patent: 5217233 (1993-06-01), Pecht et al.
patent: 5217234 (1993-06-01), Hornsby

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