Pressure balanced centrifugal tip seal

Details Pressure balanced centrifugal tip seal Pressure balanced centrifugal tip seal

2006-09-01

2009-06-23

Nguyen, Ninh H (Department: 3745)

Rotary kinetic fluid motors or pumps

Bearing, seal, or liner between runner portion and static part

Between blade edge and static part

C415S174200, C416S14600A, C416S224000

Reexamination Certificate

active

07549841

ABSTRACT:
A turbomachine having a rotor blade with a tip seal formed between the blade tip and the shroud, where the tip seal is formed by a thin metal plate extending from the blade tip and bending away from the direction of rotation of the blade such that a flat surface of the thin metal plate floats against the shroud surface by a cushion of air formed due to the rotation. The tip seal is forced against the shroud surface due to centrifugal force from rotation so that the tip seals maintain a seal even in cases of high eccentricity. Because of the cushion of air formed from rotation, the tip seal does not wear from rubbing. The flexible plate tip seal is formed from a material such as titanium for use in a compressor, or from a high temperature resistant metal alloy such as Inco 625 for use in a turbine of a gas turbine engine.

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