F - Mech Eng,Light,Heat,Weapons – 04 – D
Patent
F - Mech Eng,Light,Heat,Weapons
04
D
230/3
F04D 29/36 (2006.01)
Patent
CA 1112622
ABSTRACT OF THE DISCLOSURE: In a fan comprising an impeller including a hub arranged for rotation about the axis of rotation of the fan and having a polygonal base and a plurality of sides, support shafts affixed to the sides of the hub for rotation therewith about the axis of the fan and extending at a precone angle with respect to said axis, supports coaxial with the support shafts and rotatively mounted thereon, fan blades mounted on the rota- tively mounted supports whereby rotation of the supports varies the pitch of the blades, and a mechanism for controlling the pitch of the blades during rotation of the impeller arranged coaxially to the hub and impeller assembly. The pitch control mechanism includes a cylinder-piston unit mounted coaxially on the hub, the piston dividing the cylinder into two chambers, a first conduit means arranged to deliver compressed air to one of the cylinder chambers for moving the piston axially in an operating direction, a normally closed valve in the first conduit means for preventing delivery of the compressed air to the one cylinder chamber, a spring in the other cylinder chamber biasing the piston in a direction opposite to the operating direction, a second conduit means 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 means is delivered to the one cylinder chamber and moves the piston in the operating direction against the bias of the spring, and rod means connecting the rotatable fan blade supports to the piston and causing rotation of the supports on movement of the piston to control the pitch of the blades.
297809
Axial International Aktiengesellschaft
Robic Robic & Associes/associates
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