WIND BLADE FOR WIND TURBINE

Abstract

A wind blade for a wind turbine, comprising: a curved panel (1), the middle portion of which forms a concave structure, a side of said panel (1) being provided with a resistance portion (12), and the side of said panel (1) having the resistance portion (12) being provided with a plurality of jet stream holes (6); a cover plate (2) fixedly connected to the edge of the curved panel (1) and partially covering the concave structure in the middle portion of the curved panel (1); and, a connection member (5) for mounting the blade on a central rotating device. Said wind blade is structurally simple, and is well-adapted for safe operation and power generation at both high and low wind speeds.

Claims

1. A wind blade for a wind turbine, comprising: a curved panel, a middle portion of which forms a concave structure, a side of the curved panel being provided with a resistance portion and the side of the curved panel having the resistance portion being provided with a plurality of jet stream holes; a cover plate fixedly connected to an edge of the curved panel so as to form a wind inlet together with the curved panel; and a connection member provided for mounting the wind blade on a central rotating device.

2. The wind blade for a wind turbine according to claim 1, wherein the wind blade further comprises a central shaft fixed to the cover plate and multiple supporting members, an end of the supporting member being fixed to the central shaft and another end thereof being fixed to the curved panel.

3. The wind blade for a wind turbine according to claim 1, wherein the curved panel is symmetrical about a longitudinal center line thereof.

4. The wind blade for a wind turbine according to claim 1, wherein the cover plate and the resistance portion are arranged on a same side of the curved panel.

5. The wind blade for a wind turbine according to claim 1, wherein the resistance portion is a cambered surface.

6. The wind blade for a wind turbine according to claim 1, wherein both of the curved panel and the cover plate are a plate-type structure which is formed by fiberglass layers and epoxy resin layers overlaid with each other.

7. The wind blade for a wind turbine according to claim 2, wherein the connection member comprises a connecting rod and a mounting plate.

8. The wind blade for a wind turbine according to claim 2, wherein the central shaft is a conical rod or tube which is small at a top and big at a bottom.

9. The wind blade for a wind turbine according to claim 1, wherein the connection member is fixed to an end of the central shaft with a bigger radius.

10. The wind blade for a wind turbine according to claim 1, wherein multiple sets of the jet stream holes are evenly provided on the curved panel along a longitudinal direction and each set consists of two jet stream holes.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG. 1 is a perspective view of the wind blade for a wind turbine according to an embodiment of the present invention;

[0024] FIG. 2 is a front view of the wind blade for a wind turbine according to an embodiment of the present invention;

[0025] FIG. 3 is a side view of the wind blade of the wind blade for a wind turbine according to an embodiment of the present invention;

[0026] FIG. 4 is a bottom view of the wind blade for a wind turbine according to an embodiment of the present invention; and

[0027] FIG. 5 is a cross sectional view of the wind blade for a wind turbine according to an embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMBER IN THE FIGURES

[0028] Curved panel 1; curved panel body 11; resistance portion 12; cover plate 2; wind inlet 21; central shaft 3; supporting member 4; connection member 5; connecting rod 51; mounting plate 52; mounting hole 521; jet stream hole 6.

DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS

[0029] For understanding the technical content of the present invention more sufficiently, some embodiments of the present invention will be described as follows, by way of example only, with reference to the accompanying drawings.

[0030] Referring to FIG. 1 to FIG. 3, the wind blade for a wind turbine includes a curved panel 1 which is provided with a concave structure formed on a middle portion thereof, a cover plate 2 which partly covers the concave structure of the curved panel 1 along the edge of the curved panel 1, a central shaft 3 fixed to the cover plate 2, several supporting members 14 which has an end fixed to the central shaft 3 and another end fixed to the curved panel 1, a connection member 5 connecting to an end of the central shaft 3 and a plurality of jet stream holes 6 provided on the curved panel 1 which is covered by the cover plate 2.

[0031] Referring to FIG. 1, FIG. 3 and FIG. 5, the curved panel 1 includes a curved panel body 11 and a resistance portion 12. The curved panel body 11 has a larger dimension in longitudinal direction than that in transverse direction (it should be noted that the longitudinal direction refers to the direction of the length and the transverse direction refers to the direction of width) and it is symmetrical about its longitudinal center line. The resistance portion 12 is a cambered surface and is located on right side of the curved panel 1. The jet stream holes 6 are located around or on the resistance portion 12. In this embodiment, the curved panel 1 is a leaf shaped structure.

[0032] The curved panel body 11 is made of the materials having good performance of anti-solarization, anti-aging and high tenacity. In this embodiment, the curved panel body 11 is formed by fiberglass layers and epoxy resin layers overlaid with each other in sequence.

[0033] Referring to FIG. 1 and FIG. 2, the curved edge of the cover plate 2 has the same shape as that of the edge of the curved panel 1. The curved edge of the cover plate 2 is connected to the edge of the curved panel 1 fixedly and hermetically. The cover plate 2 includes a straight edge which is parallel to the longitudinal center line of the curved panel 1. The cover plate 2 and the curved panel 1 provide a cavity together and the cover plate 2 partly covers the cavity of the curved panel 1. There is a wind inlet 21 formed between the cover plate 2 and the curved panel 1 for allowing natural wind to enter into the wind blade and then drive the wind blade to rotate.

[0034] The cover plate 2 is made of the materials having good performance of anti-solarization, anti-aging and high tenacity. In this embodiment, the cover plate 2 is formed by fiberglass layers and epoxy resin layers overlaid with each other.

[0035] Referring to FIG. 1, the central shaft 3 is a rod or tube made of the materials with high strength and high tenacity. The central shaft 3 is a conical structure which has a radius getting large from an upper end to a lower end thereof, that is, it is a conical structure which is small at a top and big at a bottom. The central shaft 3 is fixed to the cover plate 2 so as to enhance the structural strength of the wind blade. The central shaft 3 is designed to be conical structure so as to reduce the centrifugal force when the wind blade is rotating at high speed and enhance tension intensity of the central shaft 3.

[0036] Referring to FIG. 1, one end of the supporting member 4 is fixed to the central shaft 3 and the other end thereof is fixed to the curved panel body 11. The supporting member 4 could be multiple supporting rods, which are evenly arranged on and fixed to the central shaft 3, and also could be multiple supporting plates 14. The supporting member 4 is provided to enhance the structural strength of the wind blade and then enhance the wind-resistant performance thereof, and increase the force bearing area when the wind speed is low, thereby improving the utilization ratio of wind power.

[0037] Referring to FIG. 1, FIG. 2 and FIG. 4, the connection member 5 includes a connecting rod 51 and a mounting plate 52. The connecting rod 51 has an end fixedly connecting with the end of the central shaft 3 and another end fixedly connecting with the mounting plate 52. There are multiple mounting hole 521 formed on the mounting plate 52 symmetrically. The connection member 5 is used to install the curved panel 1 onto a central rotating device of a wind turbine.

[0038] Referring to FIG. 3, the jet stream holes 16 are elliptic or rounded through-holes formed on the resistance portion 12. In this embodiment, two or multiple sets of jet stream holes 16 are evenly provided on the resistance portion 12 and each set consists of two jet stream holes 16.

[0039] In other embodiments, the curved panel 1 could be peach shaped or banana leaf shaped, and it also could be semi-cylinder shaped or semi-cone shaped. Preferably, the curved panel 1 is a leaf shaped panel which has arc-shaped edges and the width of upper part thereof is smaller than that of the lower part thereof.

[0040] Above descriptions of embodiments are provided for further illustrating the technical content of the present invention, so as to facilitate understanding and it should be understood that the invention is not to be limited to the disclosed embodiments. Any technique extension and recreation according to the present invention should be included within the scope of protection of the invention.