F - Mech Eng,Light,Heat,Weapons – 03 – D
Patent
F - Mech Eng,Light,Heat,Weapons
03
D
170/32, 170/5
F03D 3/06 (2006.01)
Patent
CA 1054522
WINDMILL ROTOR Abstract An omnidirectional windmill rotor is formed of a number (preferably seven) identical blades arranged symmetrically around a vertical shaft to which their upper and lower ends are secured. The blades are bowed outwardly at their wider central portions to define a sphere-like "chamber", each blade having a curved trailing edge projecting outwardly beyond the leading edge of the adjacent blade in order to form a "scoop" to receive the wind and induce rotation of the shaft. The lower end of each blade is twisted to form a deflecting portion on which the wind impinges to generate an upward movement of air within the chamber, serving to lighten the weight of the rotor on its bearing. In a modified version, a further project- ing secondary blade is secured to each main blade to enhance the scoop effect and to provide a gap between the main and secondary blades. This gap causes a "jet effect" at low speeds, which improves the self-starting ability of the rotor under low wind velocities, and, at high speeds, causes a braking effect that protects against overspeeding.
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