Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Impeller rotation speed responsive
Patent
1980-03-25
1983-10-25
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
Impeller rotation speed responsive
416 52, 416137, F01D 702
Patent
active
044115962
ABSTRACT:
The present invention relates to an improved blade pitch control mechanism for an air driven turbine blade mounted for rotation in a hub assembly. The control mechanism includes a drive member mounted for reciprocation along a central axis of the hub assembly. The drive member has a control member secured to one end and a seat member at the other end. The blade has operatively coupled thereto, a centrifugally responsive means which includes a pin in mating engagement with the control member. A spring is positioned between the hub assembly and the control member to thereby cause the blade to assume a coarse or high pitch position when the blade and hub assembly are in storage. A slide member is mounted on a portion of the hub assembly for reciprocation along the central axis. A spring is positioned between the seat member and the slide member. A flyweight is supported on the hub assembly and engages the slide member. Rotation of the hub assembly causes the flyweight to move the slide member and thereby move the blade pitch from coarse pitch to fine pitch and thereafter, allow the centrifugally responsive means to control the blade pitch.
REFERENCES:
patent: 1404403 (1922-01-01), Parker
patent: 1443664 (1923-01-01), Vischer
patent: 2139954 (1938-12-01), Hartley
patent: 2777524 (1957-01-01), Chapman et al.
patent: 2955656 (1960-10-01), Balje et al.
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patent: 3013613 (1961-12-01), Blackburn
patent: 3469633 (1969-09-01), Avondoglio
patent: 4257736 (1981-03-01), Jacobs
Killingsworth Ted E.
McMurry Michael B.
Powell Jr. Everette A.
Sundstrand Corporation
Williamson Harold A.
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