Stepped labyrinth seal

Details Stepped labyrinth seal Stepped labyrinth seal

2006-06-14

2008-11-04

Pickard, Alison K (Department: 3676)

Seal for a joint or juncture

Seal between relatively movable parts

Close proximity seal

C277S419000, C277S420000

Reexamination Certificate

active

07445213

ABSTRACT:
A stepped labyrinth seal for a turbomachine, the seal having a stepped portion with a redirecting groove formed thereon to redirect a leakage flow through the gap in substantially a reverse direction and onto a surface of the finger such that the dynamic pressure of the leakage flow is not substantially reduced and the static pressure increased. The cavity formed between adjacent fingers has a flow guiding surface that maintains the dynamic pressure of the flow, thereby keeping the flow at high velocity and low static pressure.

REFERENCES:
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patent: 1831242 (1931-11-01), Hanzlik
patent: 2123818 (1938-07-01), Wegmann
patent: 3572728 (1971-03-01), Smuland
patent: 3897169 (1975-07-01), Fowler
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patent: 4351532 (1982-09-01), Laverty
patent: 5244216 (1993-09-01), Rhode
patent: 5639095 (1997-06-01), Rhode
patent: 6164655 (2000-12-01), Bthien et al.
patent: 6276692 (2001-08-01), Beck et al.

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