Vertical axis wind turbine blade structure with low wind resistance and high energy capture

Abstract

The utility model discloses a low wind resistance high energy capture's vertical axis aerogenerator wind blade structure, including main shaft, wind blade main body and coniform guide vane, the wind blade main body is divided into upper, middle, lower three layers setting, the wind blade main body uses integrated forming process, and the material uses fiber thermoplastic composite material, the coniform guide vane is fixedly connected through ultrasonic welding process and make the wind blade main body with main shaft, the coniform guide vane is set in the middle position of wind blade main body and extends along the horizontal path, realizes 360 degree no dead angle wind by composite curved surface + the back of wind blade " the guide structure of vane " and meets, improves the energy capture efficiency under the low wind speed environment, reduces the wind resistance of wind blade back, reduces the eddy current noise and improves the rotation efficiency of wind blade, simplifies the manufacturing process, and reduces the manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine technology, and more specifically, to a vertical axis wind turbine blade structure with low wind resistance and high energy capture. Background Technology

[0002] Vertical axis wind turbines are widely used due to their compact structure and adaptability to wind direction, but traditional wind turbine blades mostly adopt flat or simple curved designs, which have the following limitations:

[0003] The single-layer blade layout results in insufficient frontal area at certain angles during rotation, leading to low energy utilization. Severe airflow separation on the back of the blades creates a high-resistance area. Although the blade structure described in patent CN211082134U has ventilation holes on the back of the blades that allow unidirectional airflow, the opening and closing efficiency of the baffles is low when the back of the blades is not perpendicular to the wind direction. Furthermore, the overall vertical flat shape of the blades makes it difficult to efficiently ventilate and guide airflow to reduce wind resistance.

[0004] There are currently no effective solutions to the problems in the relevant technologies. Utility Model Content

[0005] In response to the problems in related technologies, this utility model proposes a low-wind-resistance, high-energy-capture vertical axis wind turbine blade structure to overcome the aforementioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows:

[0007] A low-drag, high-energy-capture vertical axis wind turbine blade structure includes a main shaft, a blade body, and a conical guide vane. The blade body is divided into upper, middle, and lower layers and is manufactured using an integrated molding process. The material used is a fiber thermoplastic composite material. The conical guide vane is used to fix the blade body to the main shaft through an ultrasonic welding process.

[0008] As a further embodiment of this utility model, the upper wind vane includes a first upper blade, a second upper blade, and a third upper blade, which are evenly distributed at 120° along the circumference of the main axis.

[0009] As a further embodiment of this utility model, the middle layer wind turbine blade includes a first middle layer blade, a second middle layer blade, and a third middle layer blade, wherein the first middle layer blade, the second middle layer blade, and the third middle layer blade are evenly distributed at 120° along the circumference of the main axis.

[0010] As a further embodiment of this utility model, the lower blade includes a first lower blade, a second lower blade, and a third lower blade, which are evenly distributed at 120° along the circumference of the main axis.

[0011] As a further embodiment of this utility model, the included angle between the upper, middle and lower blades is 40 degrees, and the vertical distance between adjacent upper and lower blades is greater than 150mm.

[0012] As a further embodiment of this utility model, each blade adopts a horizontal hook shape, with the ratio of the distance D between the center point of the curved arc surface and the end of the blade to the distance D' between the center point and the beginning of the blade being D / D'≤0.5, and a lateral C shape, with the ratio of the arc surface depth H' to its opening distance H being 0.25≤H' / H≤0.5, and the formed enclosed wind-gathering groove is close to the end of the blade body.

[0013] As a further embodiment of this utility model, the conical air guide knife is disposed in the middle of the fan blade body and extends along a horizontal path.

[0014] The beneficial effects of this utility model are: it achieves the effect of a composite curved surface + a "wind knife" guiding structure on the back of the fan blade.

[0015] 1. 360° wind-catching design improves energy capture efficiency in low-wind environments.

[0016] 2. Reduce wind resistance on the back of the fan blades, reduce eddy noise, and improve the fan blade rotation efficiency.

[0017] 3. Simplify manufacturing processes and reduce manufacturing costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a vertical axis wind turbine blade structure with low wind resistance and high energy capture according to an embodiment of the present utility model.

[0020] Figure 2 This is a top view of a vertical axis wind turbine blade structure with low wind resistance and high energy capture according to an embodiment of the present invention.

[0021] Figure 3This is a schematic diagram of the horizontal cross-section of a single-layer blade of a vertical axis wind turbine blade structure with low wind resistance and high energy capture according to an embodiment of the present invention.

[0022] Figure 4 This is a side view cross-sectional schematic diagram of a single blade of a vertical axis wind turbine blade structure with low wind resistance and high energy capture according to an embodiment of the present utility model.

[0023] Figure 5 This is a side view of the airflow distribution of a single blade of a vertical axis wind turbine blade structure with low wind resistance and high energy capture according to an embodiment of the present invention.

[0024] In the picture:

[0025] 1. Main shaft; 2. Fan blade body; 211. First upper blade; 212. Second upper blade; 213. Third upper blade; 221. First middle blade; 222. Second middle blade; 223. Third middle blade; 231. First lower blade; 232. Second lower blade; 233. Third lower blade; 3. Conical air guide knife. Detailed Implementation

[0026] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0027] According to an embodiment of the present invention, a vertical axis wind turbine blade structure with low wind resistance and high energy capture is provided.

[0028] Please refer to the instruction manual appendix. Figure 1-5According to an embodiment of the present invention, a low-resistance, high-energy-capture vertical axis wind turbine blade structure includes a main shaft 1, a blade body 2, and a conical guide vane 3. The blade body 2 is divided into upper, middle, and lower layers and is manufactured using an integrated molding process. The material used is a fiber thermoplastic composite material. The conical guide vane 3 is used to fix the blade body 2 to the main shaft 1 via ultrasonic welding. The upper blade includes a first upper blade 211, a second upper blade 212, and a third upper blade 213, which are evenly distributed at 120° intervals along the circumference of the main shaft 1. The middle blade includes a first middle blade 221, a second middle blade 222, and a third middle blade 223, which are also distributed along the circumference of the main shaft 1. The blades are evenly distributed at 120°. The lower blades include a first lower blade 231, a second lower blade 232, and a third lower blade 233. The first lower blade 231, the second lower blade 232, and the third lower blade 233 are evenly distributed at 120° along the circumference of the main axis 1. The blade angle between the upper, middle, and lower blades is 40 degrees. The vertical distance between adjacent blades in the upper and lower layers is greater than 150 mm. Each blade adopts a horizontal hook shape. The ratio of the distance D between the center point of the curved arc surface and the end of the blade to the distance D' between the center point and the beginning of the blade is D / D'≤0.5. The blades are also C-shaped in the lateral direction. The ratio of the arc surface depth H' to its opening distance H is 0.25≤H' / H≤0.5. The enclosed wind-gathering groove formed is close to the end of the blade body 2. The conical guide vane 3 is located in the middle of the blade body 2 and extends along a horizontal path.

[0029] By using a composite curved surface and a "wind knife" airflow guiding structure on the back of the blades, 360° wind-catching without dead angles is achieved, which improves the energy capture efficiency in low wind speed environments, reduces wind resistance on the back of the blades, reduces eddy noise, and improves the rotation efficiency of the blades, simplifies the manufacturing process, and reduces manufacturing costs.

[0030] When in use, when the blades are placed in a wind field, the "C"-shaped wind-gathering grooves formed by the composite curved surface at the end of the blades capture the airflow and generate torque to drive the blades to rotate. The 40° angle design between the layers ensures that at least one blade is in the position of maximum windward face during the rotation of the blades, thereby generating continuous torque. At the same time, the wind-gathering grooves set closer to the outer edge of the blades can improve the torque of the blades to a certain extent. During the rotation, the airflow blowing towards the back of the blades will be cut by the conical air-guided blade structure and guided to the surrounding area along the curved surface of the back of the blades. The vertical spacing between adjacent layers of blades is ≥150mm to ensure sufficient space for the airflow on the back to be discharged, thereby reducing the resistance encountered by the blades during operation.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A low-drag, high-energy-capture vertical axis wind turbine blade structure, comprising a main shaft (1), a blade body (2), and a conical guide vane (3), characterized in that: The main body of the fan blade (2) is divided into three layers: upper, middle and lower. The main body of the fan blade (2) adopts an integrated molding process and is made of fiber thermoplastic composite material. The conical air guide knife (3) is fixedly connected to the main shaft (1) by ultrasonic welding process.

2. The blade structure of a low-drag, high-energy-capture vertical axis wind turbine according to claim 1, characterized in that: The upper blades include a first upper blade (211), a second upper blade (212), and a third upper blade (213), which are evenly distributed at 120° along the circumference of the main axis (1).

3. The blade structure of a low-drag, high-energy-capture vertical axis wind turbine according to claim 2, characterized in that: The middle layer blades include a first middle layer blade (221), a second middle layer blade (222), and a third middle layer blade (223), which are evenly distributed at 120° along the circumference of the main axis (1).

4. The blade structure of a low-drag, high-energy-capture vertical axis wind turbine according to claim 3, characterized in that: The lower blades include a first lower blade (231), a second lower blade (232), and a third lower blade (233), which are evenly distributed at 120° along the circumference of the main axis (1).

5. The blade structure of a low-drag, high-energy-capture vertical axis wind turbine according to claim 4, characterized in that: The blade angle between the upper, middle and lower layers of the fan blades is 40 degrees, and the vertical distance between adjacent upper and lower layers of fan blades is greater than 150 mm.

6. The blade structure of a low-drag, high-energy-capture vertical axis wind turbine according to claim 5, characterized in that: Each blade adopts a horizontal hook shape, with the ratio of the distance D between the center point of the curved arc surface and the end of the blade to the distance D' between the center point and the beginning of the blade being D': D / D'≤0.5, and a lateral C shape, with the ratio of the arc surface depth H' to its opening distance H being 0.25≤H' / H≤0.5, and the enclosed wind-gathering groove formed is close to the end of the blade body (2).

7. The blade structure of a low-drag, high-energy-capture vertical axis wind turbine according to claim 1, characterized in that: The conical air guide knife (3) is located in the middle of the fan blade body (2) and extends along a horizontal path.

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