| 摘要 |
PCT No. PCT/SE82/00162 Sec. 371 Date Dec. 16, 1982 Sec. 102(e) Date Dec. 16, 1982 PCT Filed May 11, 1982 PCT Pub. No. WO82/04103 PCT Pub. Date Nov. 25, 1982.Means for limiting rotational speed in a vertical shaft wind turbine (1) having a central hub (3) and spokes (4) extending therefrom. Spokes lying over each other support at their ends turbine blades (6) placed concentrically around the turbine shaft. Each turbine blade (6) is pivotable around a vertical axle (CA), and a leaf spring bundle (10) is in each spoke placed between the turbine blade and the base of the spoke in order to adjust, when the turbine is at a rest, the turbine blade chord angle ( beta ) in to a predetermined position and taking an unloaded state in which its center of gravity (CG) is located near and, as seen in the direction of rotation of the tubine, behind a plane (15) through the symmetry axis (CB) of the turbine shaft and the pivot axle (CA) of the turbine blade. The pivot axle (CA) of the turbine blade has such a position that the torque of the wind forces (P) around the pivot axle is reduced to a minimum. The spring bundle (10) is dimensioned to exert a great resistance to deflection when the turbine rotates at operation speed, the chord angle of the turbine blade thereby remaining essentially unchanged, and in order to deflect gradually and faster and faster at higher rotation speeds beyond operation speed resulting in a readjustment of the turbine blade (6) in a direction for limiting the rotation speed. |
