Vibration dampening device disposed on a shroud member for a twi

Details Vibration dampening device disposed on a shroud member for a twi Vibration dampening device disposed on a shroud member for a twi

1975-03-03

1976-10-19

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

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

Axially extending shroud ring or casing

416191, 416192, 416500, F01D 510, F01D 522

Patent

active

039867927

ABSTRACT:
A vibration, damper, or snubber device is disposed on the radially outward surface of a shroud member mounted on a turbine rotor. The rotor has an annular array of twisted blades connected together to form blade groups by a first and a second shroud member. The vibration damper, or snubber, is mounted on the first shroud member and extends therefrom across a gap between the shroud members to circumferentially overlap a portion of the second shroud member. A predetermined axial gap is defined between a portion of the second shroud and the snubber. When an untwist motion is imposed upon the blades due to rotation of the rotor, the axial gap closes and an abutment between the snubber and the second shroud occurs to inhibit further untwist motion and to simultaneously provide a friction interface to inhibit circumferential motion between the second shroud and the vibration damper.

REFERENCES:
patent: 835471 (1906-11-01), Rotter
patent: 1371328 (1921-03-01), Schneider
patent: 2347034 (1944-04-01), Doran
patent: 2391623 (1945-12-01), Heppner
patent: 2510734 (1950-06-01), Bodger
patent: 2610823 (1952-09-01), Knowlton
patent: 3795462 (1974-03-01), Trumpler

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