Wind turbine having variable pitch airfoils that close when moving against the direction of the wind
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H20P-009/04
출원번호
UP-0805389
(2007-05-23)
등록번호
US-7550865
(2009-07-01)
발명자
/ 주소
Jonsson, Stanley C.
대리인 / 주소
Gordon & Rees, LLP
인용정보
피인용 횟수 :
11인용 특허 :
13
초록▼
A wind turbine, having: a rotatable frame; a plurality of airfoils mounted to the rotatable frame, the wherein the airfoils extend parallel to an axis of rotation of the rotatable frame, and wherein the airfoils are individually pivotable with respect to the rotatable frame; and a mechanism that hol
A wind turbine, having: a rotatable frame; a plurality of airfoils mounted to the rotatable frame, the wherein the airfoils extend parallel to an axis of rotation of the rotatable frame, and wherein the airfoils are individually pivotable with respect to the rotatable frame; and a mechanism that holds each of the airfoils in a high lift/high drag position when the airfoil moves in a direction of air flow. The wind turbine may optionally include a rotational stop to prevent rotation of the air foil from a high drag position to a low drag position when the airfoil is moving in the direction of the wind flow.
대표청구항▼
What is claimed is: 1. A wind turbine, comprising: a rotatable frame; a plurality of airfoils mounted to the rotatable frame, the wherein the airfoils extend parallel to an axis of rotation of the rotatable frame, and wherein the airfoils are individually pivotable with respect to the rotatable fra
What is claimed is: 1. A wind turbine, comprising: a rotatable frame; a plurality of airfoils mounted to the rotatable frame, the wherein the airfoils extend parallel to an axis of rotation of the rotatable frame, and wherein the airfoils are individually pivotable with respect to the rotatable frame; a mechanism that holds each of the airfoils in a high lift/high drag position when the airfoil moves in a direction of air flow, wherein the airfoils are dimensioned such that leading and trailing edges of successive airfoils are in contact with one another when the airfoils move in a direction opposite to the direction of air flow; and a rotational stop connected to each of the airfoils to limit pivoting of the airfoils with respect to the rotatable frame to prevent rotation of the air foil from a high drag position to a low drag position when the airfoil is moving in the direction of the air flow. 2. The wind turbine of claim 1, wherein the rotational stop orients the airfoils at a position such that lift caused by air flow over the airfoil causes the rotatable frame to rotate. 3. The wind turbine of claim 1, wherein the rotational stop orients the airfoils at a position such that drag caused by air flow over the airfoil causes the rotatable frame to rotate. 4. A wind turbine, comprising: a rotatable frame; a plurality of airfoils mounted to the rotatable frame, the wherein the airfoils extend parallel to an axis of rotation of the rotatable frame, and wherein the airfoils are individually pivotable with respect to the rotatable frame; a mechanism that holds each of the airfoils in a high lift/high drag position when the airfoil moves in a direction of air flow, wherein the airfoils are dimensioned such that leading and trailing edges of successive airfoils are in contact with one another when the airfoils move in a direction opposite to the direction of air flow; a channel extending around a portion of the rotatable frame; and a guide on each of the plurality of airfoils, the guide being dimensioned to pass through the channel, wherein the guide prevents rotation of the airfoil with respect to the rotatable frame as the airfoil moves in a direction opposite to the direction of air flow. 5. The wind turbine of claim 4, wherein the guide positions the airfoil at the low drag position as the airfoil moves in a direction opposite to the direction of air flow. 6. The wind turbine of claim 1, wherein air flow perpendicular to the axis of rotation of the rotatable frame causes the rotatable frame to rotate. 7. The wind turbine of claim 1, wherein the rotatable frame rotates about a vertical axis. 8. The wind turbine of claim 1, wherein each airfoil pivots about an axis positioned closer to the leading edge of the airfoil than to the trailing edge of the airfoil. 9. The wind turbine of claim 1, further comprising: a generator drive wheel in contact with the rotatable frame. 10. The wind turbine of claim 1, wherein the rotatable frame is a rotor of an electric generator. 11. The wind turbine of claim 1, wherein the airfoils are permitted to rotate with respect to the rotatable frame when moving in the direction of the air flow. 12. The wind turbine of claim 1, wherein the airfoils are not permitted to rotate with respect to the rotatable frame when moving against the direction of the air flow. 13. The wind turbine of claim 1, wherein the airfoils are curved. 14. The wind turbine of claim 13, wherein the airfoils are shaped to provide lift in a direction perpendicular to the direction of airflow over the airfoil.
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이 특허에 인용된 특허 (13)
Koch Gerald W. (Williamsville NY), Energy machine.
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