Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Impeller rotation speed responsive
Patent
1980-08-18
1983-12-06
Hornsby, Harvey C.
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
Impeller rotation speed responsive
416154, 416157R, 416220R, F01D 702
Patent
active
044190506
ABSTRACT:
A variable pitch propeller is controlled by a hydraulic mechanism responsive to forces urging an unsymmetrically mounted propeller towards its maximum pitch. Spring bias means maintains the propeller at minimum pitch under conditions of rest. The propeller is prevented from increasing its pitch by the pressure produced on a closed hydraulic chamber until it reaches a predetermined r.p.m., when a centrifugal valve opens a first port and relieves the pressure in the cylinder and allows the propeller to increase in pitch. The increase in pitch opens a second port communicating with the pressure chamber, but that channel remains closed by a second valve that is normally closed but opens in response to a reduction in the throttle setting. The reduction in throttle setting closes the centrifugal valve so that the only channel from the pressure chamber is through the second port. When the second port is opened by the action of the reduced throttle, which reduces the forces generated on the control system by the propeller, the pitch immediately increases and in turn closes the second port and locks the propeller in the higher pitch position. The propeller is supported for rotation about its radial axis by two pairs of radially-aligned V-blocks and pivot blocks that provides a low-friction, sturdy mount.
REFERENCES:
patent: 2694459 (1954-11-01), Biermann
patent: 2911050 (1956-11-01), Scott
patent: 3115939 (1963-12-01), Berninger
patent: 3799699 (1974-03-01), Master
Barrett E. Thorpe
Hornsby Harvey C.
Kwon John T.
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