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Wind power blade and fan

A technology for wind power blades and blade bodies, which is applied in the field of wind power generation and can solve the problems of weak connection of flexible bending parts and the like

Pending Publication Date: 2020-07-07
SINOMATECH WIND POWER BLADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A main purpose of the present invention is to overcome at least one defect of the above-mentioned prior art, and provide a wind turbine blade to solve the problem of weak connection of the flexible bending part existing in the prior art

Method used

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  • Wind power blade and fan
  • Wind power blade and fan
  • Wind power blade and fan

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0058] The present invention provides a wind turbine blade, which includes a blade body 1 and a flexible extension 2. The blade body 1 includes a suction surface 11 and a pressure surface 12, a front edge 13 and a rear edge 14. The flexible extension 2 includes a first end 21 and a second end 22. The first end 21 has a bending portion 25 connected to the suction surface 11, and the second end 22 is freely directed toward the blade body 1 The trailing edge 14 extends.

[0059] When the wind power blade is working, the flexible extension 2 can be passively deformed, thereby changing the trailing edge side airfoil of the wind power blade. Among them, the term “passive deformation” refers to the influence or action of some external force, the flexible extension part 2 swings toward or away from the suction surface 11 with its connection with the suction surface 11 as an axis. In addition, it should be understood that the external force may be generated by aerodynamics, gravity and / ...

no. 2 approach

[0086] The second embodiment is a schematic modification of the first embodiment, and the same technical features as those of the first embodiment will not be described in detail here. The differences are:

[0087] Such as figure 2 As shown, the bending portion 25 includes a connecting portion 252. One end of the connecting portion 252 starts from the end surface of the folded edge 251 facing the front edge 13 and extends along the suction surface 11 to the front edge 13, and the connecting portion 252 faces the blade body 1 One side of the front edge 13 forms an inclined surface, and the connecting portion 252 is connected to the suction surface 11. In other words, the cross-sectional shape of the bent portion 25 along the chord direction D may be approximately a triangle, and the end of the extension portion body close to the front edge 13 is integrally formed on the top of the triangle. Accordingly, the connecting portion 252 and the folded edge 251 are simultaneously connect...

no. 3 approach

[0089] Such as image 3 As shown, in this embodiment, the flexible extension portion 2 includes an extension portion body 24 and a bending portion 25. The bending portion 25 is provided at one end of the extension portion body 24 facing the front edge 13 of the blade body 1, and the suction surface 11 has The opening 17 and the bent portion 25 can be fitted into the opening 17.

[0090] It should be understood that one end of the bent portion 25 may be connected to the extension body 24, and the other end of the bent portion 25 may extend toward the suction surface, and the extension direction may be perpendicular to the suction surface, or It is an acute or obtuse angle with the suction surface.

[0091] In addition, in this embodiment, the number of openings 17 is not limited, and it may be one, two or more, and a plurality of openings 17 may be arranged at intervals. The shape of the opening 17 may be rectangular, hole-shaped or other shapes. When the number of openings 17 is ...

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PUM

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Abstract

The invention provides a wind power blade and a fan. The wind power blade comprises a blade body and a flexible extension part; the blade body comprises a suction surface and a pressure surface; and the flexible extension part comprises a first end and a second end, the first end is provided with a bent part which is connected to the suction surface, the second end freely extends to the rear edgeof the blade body, and the flexible extension part can generate passive deformation and then changes the flow trajectory of an air flow along the suction surface.

Description

Technical field [0001] The present invention generally relates to the field of wind power generation, and in particular, to a wind power blade and a fan installed with the wind power blade. Background technique [0002] In the operation of the variable-pitch wind turbine blades, since the blade root position relative to the blade tip position in the rotation plane is relatively small, when the wind speed is the same, the angle of attack of the section near the maximum chord length is greater than the angle of attack at the tip position. As the wind speed increases, when the wind speed does not reach the rated wind speed, the cross-sectional angle of attack near the maximum chord length gradually increases. At the rated wind speed, the angle of attack reaches a higher value, and the blade produces the maximum output power at this time. As the wind speed increases, the blades are pitched in order to maintain the rated power. When the wind speed is greater than the rated wind speed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D1/06
CPCF03D1/0675F05B2260/96Y02E10/72
Inventor 李成良郝赫为李磊周捍珑方致阳乔玉军
Owner SINOMATECH WIND POWER BLADE
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