Low and reverse pressure application hydrodynamic...

Details Low and reverse pressure application hydrodynamic... Low and reverse pressure application hydrodynamic...

2011-01-20

2011-12-13

Patel, Vishal (Department: 3674)

Seal for a joint or juncture

Process of dynamic sealing

Close proximity seal

C277S416000

Reexamination Certificate

active

08074995

ABSTRACT:
The present invention relates to circumferential seal ring segments positioned around a rotating shaft so as to prevent fluids from leaking from a lubricant sump during both low and high pressure conditions. The circumferential seal is comprised of a plurality of adjoining annular ring segments facing the rotating shaft. Each sealing ring segment includes a dead end circumferential groove on a shaft-side face of each sealing ring such that, when the segments are joined, the circumferential dead end groove of each segment extends arcuately in the direction of shaft rotation. At least one additional groove is contained on the shaft-side face of each sealing ring segment. The additional groove(s) directs and creates pressurized air within the dead end circumferential groove, either directly or indirectly maintaining a seal between the ring segments and the shaft. A bleed hole may also be provided to create a seal between each sealing segment.

REFERENCES:
patent: 3575424 (1971-04-01), Taschenberg
patent: 4943069 (1990-07-01), Jinnouchi
patent: 5169159 (1992-12-01), Pope et al.
patent: 5509664 (1996-04-01), Borkiewicz
patent: 6145843 (2000-11-01), Hwang
patent: 6692006 (2004-02-01), Holder

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