F - Mech Eng,Light,Heat,Weapons – 03 – D
Patent
F - Mech Eng,Light,Heat,Weapons
03
D
170/15
F03D 7/06 (2006.01)
Patent
CA 1191455
ABSTRACT OF THE DISCLOSURE An arrangement for limiting rotational speed in a ver- tical shaft wind turbine has a central hub and spokes extending therefrom. Spokes lying over each other support at their ends turbine blades placed concentrically around the turbine shaft. Each turbine blade is pivotable about a vertical axle, and a leaf spring bundle is in each spoke placed between the turbine blade and the base of the spoke in order to set, when the turbine is at a rest, the turbine blade chord angle to a predetermined posi- tion. In an unloaded state the centre of gravity of the leaf spring is located near and, as seen in the direction of rotation of the turbine, behind a plane through the symmetry axis of the turbine shaft and the pivot axle of the turbine blade. The pivot axle of the turbine blade has such a position that the torque of the wind forces around the pivot axle is reduced to a minimum. The spring bundle is dimensioned to exert a great resistance to deflection when the turbine rotates at operation speed so that chord angle of the turbine blade remains essentially unchanged. At more higher rotation speeds beyond operation speed the spring bundle deflects more and more, resulting in a readjustment of the turbine blade in a direction limiting the rotation speed.
402694
Marks & Clerk
Saab-Scania Aktiebolag
LandOfFree
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