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 sta
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.
대표청구항▼
1. 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
1. 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. 2. The Darrieus windmill according to claim 1, further comprising a vertical secondary shaft that is connected with the primary shaft to rotate together at low wind speed and that separates from the primary shaft to independently rotate from the primary shaft at high wind speed, a plurality of support arms that radially extend from the outer circumference of the secondary shaft, wherein the secondary blades are fixed to the support arms, respectively, and generate rotating moment by means of drag force. 3. The Darrieus windmill according to claim 2, wherein the primary shaft is disposed coaxially in the secondary shaft, which is a hollow member, and a one-way clutch is disposed between the secondary shaft and the primary shaft. 4. The Darrieus windmill according to claim 1, further comprising a plurality of support arms radially extending from the outer circumference of the primary shaft, wherein the secondary blades are helically formed around the primary shaft and fixed to the support arms, respectively, to generate rotating moment by means of drag force. 5. The Darrieus windmill according to claim 1, 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, to generate rotating moment by means of drag force. 6. The windmill of claim 1, wherein each of the primary blades has a cross-section in an airfoil shape. 7. The windmill of claim 1, wherein each of the primary blades has upper and lower ends fixed to upper and lower portions of the primary shaft, respectively. 8. The windmill of claim 7, wherein each of the primary blades is formed in an arc shape.
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이 특허에 인용된 특허 (10)
Douglass, Karl J.; McCabe, Francis J.; Dickie, Robert, Cylindrical wind turbine.
Zapata Martinez Valentin (No. 3 Lerida St. Madrid ESX 20), System for the obtainment and the regulation of energy starting from air, sea and river currents.
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