Fluid reaction surfaces (i.e. – impellers) – Having positive means for impeller adjustment
Patent
1995-11-07
1997-11-11
Kwon, John T.
Fluid reaction surfaces (i.e., impellers)
Having positive means for impeller adjustment
416163, 416164, F04D 2936
Patent
active
056856946
ABSTRACT:
An air driven turbine having variable pitched blades is provided that includes a pitch change mechanism for adjusting the pitch of the blades during either rotating or non-rotating operational modes of the air driven turbine. The pitch control mechanism includes a resettable overspeed protection device which is directly actuated by an overspeed condition of the turbine and operates independently from the pitch change mechanism to move the blades to a failsafe, feathered, or coarse pitch, low speed position. The pitch control mechanism utilizes a linear actuator in the form of an acme screw drive. The air driven turbine includes a ball ramp thrust bearing for attaching the blades to a hub of the turbine in such a manner that during rotation of the turbine actuation loads on the pitch change mechanism are reduced.
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Althof Jon B.
Jones Teddy L.
Crowe Lawrence E.
Kwon John T.
Sundstrand Corporation
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