Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Axially extending shroud ring or casing
Patent
1991-08-08
1992-09-01
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Axially extending shroud ring or casing
416193A, 416500, F01D 526
Patent
active
051435179
ABSTRACT:
A fan for a turboshaft engine is disclosed comprising a rotatable disc having an array of blades secured at evenly spaced intervals around its periphery, each pair of successive blades and the disc defining a space which is delimited by the stem and a platform of a first of the two blades, the stem and a platform of the second of the two blades, and the periphery of the disc between the two blades. In order to reduce vibration during operation of the fan, each of the spaces houses a flyweight and a pair of rigid rockers disposed between the flyweight and the stems and platforms of the first and second blades delimiting the space such that, under the action of centrifugal force generated by rotation of the disc, the flyweight acts on the first and second blades through the rockers, the two rockers mutually engaging each other while a first of the rockers bears on the stem and the platform of the first blade at separate positions, the second of the two rockers bears on the stem and the platform of the second blade at separate positions, and the flyweight bears on both the first and the second rockers.
REFERENCES:
patent: 3666376 (1972-05-01), Damlis
patent: 4101245 (1978-07-01), Hess et al.
patent: 4182598 (1980-01-01), Nelson
patent: 4723889 (1988-02-01), Charreron et al.
Soviet Union Abstract, I. A. Chernyaev, SU-A-1 127 979, Dec. 7, 1984.
Look Edward K.
Societe Nationale d'Etude et de Construction de Moteurs
Verdier Christopher M.
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