Fluid reaction surfaces (i.e. – impellers) – Having positive means for impeller adjustment – Motor bodily rotatable with impeller hub or shaft
Patent
1978-02-23
1980-09-09
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Having positive means for impeller adjustment
Motor bodily rotatable with impeller hub or shaft
416 48, F04D 2936
Patent
active
042215412
ABSTRACT:
A mechanism for controlling the pitch of fan blades during rotation of the fan impeller includes a cylinder-piston unit mounted coaxially on the impeller hub, a first conduit arranged to deliver compressed air to one cylinder chamber for axially moving the piston in an operating direction, a normally closed valve in this conduit for preventing compressed air delivery to this chamber, a spring in the other cylinder chamber biasing the piston in an opposite direction, a second conduit arranged to deliver an environmentally controlled flow of compressed air to the valve for opening the valve under predetermined environmental conditions whereby the compressed air in the first conduit is delivered to the one cylinder chamber and moves the piston in the operating direction against the spring bias, and rods connecting rotatable fan blade supports to the piston and causing rotation of the supports about their axes on movement of the piston to control the pitch of the blades.
REFERENCES:
patent: 2665054 (1954-01-01), Fischer
patent: 2826395 (1958-03-01), Petty
patent: 3300123 (1967-01-01), Freyholdt et al.
patent: 3768546 (1973-10-01), Shipes
patent: 3792937 (1974-02-01), Chilman
patent: 3844680 (1974-10-01), Saterdal
patent: 3984194 (1976-10-01), Fermer
patent: 4019792 (1977-04-01), Monroe
patent: 4037986 (1977-07-01), Chilman
patent: 4046486 (1977-09-01), Kolb
patent: 4049363 (1977-09-01), Baumann
AXIAL International Aktiengesellschaft
Kelman Kurt
Powell Jr. Everette A.
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