Patent ID: 8258648
Filing Date: 2012-09-04
Classification: F03D,F05B,Y02E

Abstract:
1. A windmill for a wind power generator, which receives wind power to be rotated in a constant rotational direction around a predetermined rotation shaft, comprising: two or more blades which are provided around the rotation shaft so as to be rotated by receiving the wind power from a rotation shaft line direction of the rotation shaft and extend radially outward with respect to the rotation shaft; a blade fixing portion which fixes the blades to the rotation shaft in the form of, when the blade receives the wind power, receiving a pressing force so that a width direction of a wind receiving surface of the blade is nearly parallel to the wind and, in the form that the angle formed by the width direction of the wind receiving surface and the rotation shaft line direction of the rotation shaft is variable; and a blade angle adjustment mechanism which comprises biasing unit and a spindle member, wherein when the wind power is less than a predetermined light wind level, the biasing unit biases and holds the blade, which receives the wind power, at a predetermined angle position for initial rotation where the width direction is most nearly parallel to the wind, wherein the spindle member is coupled to the blade through a link mechanism so that when the wind power is more than the predetermined light wind level, the centrifugal force overcomes the pressing force due to the wind power applied to the blade and the biasing force of the biasing unit, whereby the blade varies to be nearly perpendicular to the wind while the spindle member displaces outward, wherein when the wind power reaches a predetermined strong wind level, the blade is made to reach a predetermined angle position for high speed rotation where the width direction of the blade is most nearly perpendicular to the wind, and wherein when the wind power further exceeds the strong wind level, the pressing force due to the wind power and the biasing force of the biasing unit overcomes the centrifugal force to push back the spindle member inward, whereby the blade is returned so that the width direction of the blade is nearly parallel to the wind.