Air driven turbine including a blade pitch control system

Details Air driven turbine including a blade pitch control system Air driven turbine including a blade pitch control system

1995-11-07

1998-07-14

Verdier, Christopher

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Plural diverse condition responsive

416 30, 416 35, 416 47, 416 49, 416 50, 416 51, 416162, 416165, F01D 702

Patent

active

057794464

ABSTRACT:
An air driven turbine having variable pitched blades is provided that includes a pitch change mechanism and associated control circuits for automatically 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. The control circuits utilize simple on-off switching circuits for controlling blade pitch, thereby eliminating the need for more complex PID type control functions.

REFERENCES:
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patent: 4656362 (1987-04-01), Harner et al.
patent: 4692093 (1987-09-01), Safarik
patent: 5199850 (1993-04-01), Carvalho et al.

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