Vertical shaft type darius windmill
AssigneeCygnus Power Co., Ltd
InventorYang Il Yoon
Life of this patent
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Abstract
The present invention relates to a Darrieus windmill, and more specifically, to a vertical axis type Darrieus windmill that enables self-start in the low wind velocity range. The Darrieus windmill, in which a primary vertical shaft is rotated by the lift forces generated by primary blades, has a starting means for assisting the starting or rotation of the primary shaft at a low wind velocity. The present invention provides advantages of enabling self-start and rotation due to the lift generated by the blade in low wind velocity conditions and enabling the generation of rotating moments in any wind direction or wind velocity, thereby easily starting even in urban areas with very low wind velocities or large variations in wind direction, and thus enabling the generation of electricity over a wide range of wind velocities.
Claims8
A Darrieus windmill equipped with a vertical primary shaft and a plurality of primary blades fixed to the primary shaft and generating rotating moment by means of lift force, the Darrieus windmill comprising starting means that are formed at the primary shaft or the primary blades and starts the primary shaft by means of wind force, wherein the starting means comprises secondary blades, wherein each of the secondary blades comprises a first portion extending in a first direction, a bending portion extending from the first portion, and a second portion extending from the bending portion in a second direction, wherein the first and second directions are opposite so that the first and second portions face each other, wherein the first portion has a length larger than a length of the second portion;
- and the second portion is nearer to the primary shaft than the first portion;
- and further comprising a plurality of support arms radially extending from the outer circumference of the primary shaft wherein the secondary blades are fixed to the support arms, respectively, and wherein the secondary blades generate rotating moment by means of a drag force.
Dependencies are inferred from the claim text.