Controlled leakage pin and vibration damper for active...

Details Controlled leakage pin and vibration damper for active... Controlled leakage pin and vibration damper for active...

2007-01-16

2007-01-16

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Axially extending shroud ring or casing

Reexamination Certificate

active

10995342

ABSTRACT:
Damper pins are disposed in circumferentially registering grooves of turbine bucket platform slash faces. The pins have a plurality of channels formed about peripheral portions thereof for flowing leakage cooling air from below the platform past the pin and groove into the interplatform gap. The channels may be staggered in an axial direction. By flowing cooling air through the channels, the slash faces are convectively cooled, opposite slash faces to the channels are impingement cooled and the exiting cooling air purges the gap between the slash faces adjacent the hot gas path. Alternatively, the channels may be formed in the grooved surfaces and a cylindrical damping pin may be inserted with similar cooling effects.

REFERENCES:
patent: 4088421 (1978-05-01), Hoeft
patent: 4917574 (1990-04-01), Dodd et al.
patent: 5531457 (1996-07-01), Tibbott et al.
patent: 6776583 (2004-08-01), Wang et al.
patent: 7021898 (2006-04-01), Elliott et al.

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