A wind turbine blade structure with high efficiency and noise reduction

Abstract

The utility model discloses a wind turbine blade structure with high efficiency and noise reduction, comprising a blade body, a mounting groove is provided at the rear edge of the blade body, a spoiler is fixedly installed at the rear edge of the blade body through the mounting groove, irregular noise reduction saw teeth are arranged at the end of the spoiler, irregularly distributed spoiler convex points are symmetrically arranged at the upper and lower sides of the spoiler, a through groove is provided at the middle of the spoiler, a sound absorbing body is arranged inside the through groove, the spoiler convex points include arc-shaped protrusions located at the upper and lower sides of the spoiler, a connecting rod is integrally arranged between the opposite arc-shaped protrusions, and the connecting rod runs through the spoiler and the sound absorbing body. When the blade body rotates, the airflow flows irregularly, weakening the noise generated by the interaction between the airflows in different directions and the blade trailing edge section, thereby achieving the reduction of the noise level of the wind turbine blade.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation equipment, in particular to a wind power blade structure with high efficiency and noise reduction. Background Art

[0002] Wind power generation is gradually becoming the mainstream alternative energy source for major energy countries due to its advantages of being green, clean, low-carbon and low cost per kilowatt-hour. With the rapid construction of wind farms, some wind farms are located very close to residential areas when they are sited, resulting in complaints about the noise of wind turbines affecting the hearing of local residents. Therefore, noise nuisance has become an urgent problem for many wind farm owners to solve.

[0003] In the past, different methods have been proposed to reduce the operating noise of wind turbines. One option to reduce the operating noise of wind turbines is to meet the noise constraints by reducing the power of the wind turbines. However, reducing the power of the wind turbines also sacrifices the efficiency of the wind turbines in utilizing wind energy to a certain extent. Another option is to connect a sawtooth noise reduction structure adjacent to the trailing edge of the wind turbine blades to reduce the noise when the wind flows along the trailing edge of the wind turbine blades. However, the sawtooth in the existing sawtooth noise reduction structure is generally a regular sawtooth with equal spacing and size for ease of processing. The sawtooth will still cause air vortices that generate noise when disturbing the airflow. In some special cases, the regular sawtooth noise reduction structure can even resonate with the noise and increase the noise.

[0004] To this end, we propose a wind turbine blade structure with high efficiency and noise reduction. Utility Model Content

[0005] The purpose of the utility model is to provide a wind turbine blade structure with high efficiency and noise reduction, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an efficient noise reduction wind turbine blade structure, comprising a blade body, a mounting groove is provided at the trailing edge of the blade body, a spoiler is fixedly installed on the trailing edge of the blade body through the mounting groove, irregular noise reduction serrations are provided at the end of the spoiler, irregularly distributed spoiler convex points are symmetrically provided on the upper and lower sides of the spoiler, a through groove is provided in the middle of the spoiler, a sound absorbing body is provided inside the through groove, the spoiler convex points include arc-shaped protrusions located on the upper and lower sides of the spoiler, a connecting rod is integrally provided between the opposite arc-shaped protrusions, and the connecting rod passes through the spoiler and the sound absorbing body.

[0007] Optionally, a connecting strip plugged into the mounting groove is provided on one side of the spoiler, the connecting strip is provided with a fixing through hole, a fixing pin is penetrated through the fixing through hole, and the connecting strip is fixedly mounted to the trailing edge of the blade body via the fixing pin.

[0008] Optionally, the fixing pin has the same shape as the spoiler convex point, and both ends of the fixing pin are integrally provided with arc-shaped heads that are in close contact with the blade body.

[0009] Optionally, the upper and lower sides of the spoiler are arc surfaces, and the connection between the spoiler and the blade body is smoothly transitioned.

[0010] Optionally, the sound absorbing body is a porous sound absorbing foam wrapped with a waterproof fiber cloth on the outside.

[0011] Optionally, the thickness of the spoiler gradually decreases from an end close to the trailing edge of the blade body to an end away from the mounting groove.

[0012] Optionally, the irregular noise reduction sawtooth edge is in a gentle arc shape.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The wind turbine blade structure with high efficiency and noise reduction has a spoiler fixedly installed through a mounting groove. When the blade body rotates, the leading edge of the blade body cuts the air, so that the air flows from the upper and lower sides of the blade body to the trailing edge. The airflow close to the outer surface of the blade body flows along the outer surface of the spoiler, and is first disturbed by a number of unevenly distributed spoiler convex points, so that the originally smooth airflow flows irregularly. When the irregular airflow flows to the end of the spoiler, due to the irregular serrations, the irregularly flowing airflows on both sides of the spoiler collide at different times at the irregular serration trailing edges, thereby causing the airflow to flow irregularly, weakening the noise generated by the interaction between airflows in different directions and the trailing edge section of the blade, thereby achieving a reduction in the noise level of the wind turbine blade.

[0015] 2. The wind turbine blade structure with high efficiency and noise reduction is provided with a sound absorbing body. When the airflow impacts the spoiler and the spoiler protrusion to generate noise, the generated noise vibration is transmitted to the sound absorbing body inside the through groove. The vibration received by the spoiler protrusion is transmitted to the sound absorbing body through the connecting rod. The noise vibration is absorbed by the sound absorbing body, thereby reducing the generation of noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a wind turbine blade structure with high efficiency and noise reduction according to the utility model;

[0017] Figure 2 The utility model is a wind turbine blade structure with high efficiency and noise reduction Figure 1 The enlarged view of point A in the middle;

[0018] Figure 3 This is a schematic structural diagram of a spoiler of a wind turbine blade structure with high efficiency and noise reduction according to the utility model;

[0019] Figure 4 The utility model is a schematic structural diagram of the spoiler convex point of a wind turbine blade structure with high efficiency and noise reduction.

[0020] In the figure: 1. blade body; 2. mounting groove; 3. spoiler; 4. connecting strip; 5. fixing pin; 6. noise reduction serration; 7. spoiler convex point; 71. arc-shaped protrusion; 72. connecting rod; 8. through groove; 9. sound absorber; 10. fixing through hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figures 1 to 4 The utility model provides a wind turbine blade structure with high efficiency and noise reduction, including a blade body 1, a mounting groove 2 is provided at the trailing edge of the blade body 1, a spoiler 3 is fixedly installed at the trailing edge of the blade body 1 through the mounting groove 2, the upper and lower sides of the spoiler 3 are arc surfaces, the connection between the spoiler 3 and the blade body 1 is smoothly transitioned, irregular noise reduction serrations 6 are provided at the end of the spoiler 3, the edges of the irregular noise reduction serrations 6 are gentle arc-shaped, irregularly distributed spoiler convex points 7 are symmetrically provided at the upper and lower sides of the spoiler 3, a through groove 8 is provided in the middle of the spoiler 3, and a sound absorbing body is provided inside the through groove 8 9, the spoiler convex point 7 includes an arc-shaped protrusion 71 located on the upper and lower sides of the spoiler 3, and a connecting rod 72 is integrally arranged between the opposite arc-shaped protrusions 71. The connecting rod 72 passes through the spoiler 3 and the sound absorbing body 9. The sound absorbing body 9 is a porous sound-absorbing foam wrapped with a waterproof fiber cloth on the outside. By setting the sound absorbing body 9, when the airflow impacts the spoiler 3 and the spoiler convex point to generate noise, the generated noise vibration is transmitted to the sound absorbing body 9 inside the through groove 8, and the vibration received by the spoiler convex point 7 is transmitted to the sound absorbing body 9 through the connecting rod 72. The vibration of the noise is absorbed by the sound absorbing body 9 to reduce the generation of noise.

[0023] A connecting strip 4 plugged into the mounting groove 2 is provided on one side of the spoiler 3, and a fixing through hole 10 is provided on the connecting strip 4, and a fixing pin 5 is provided through the fixing through hole 10, and the connecting strip 4 is fixedly installed with the trailing edge of the blade body 1 through the fixing pin 5, and the thickness of the spoiler 3 gradually decreases from the end close to the trailing edge of the blade body 1 to the end away from the mounting groove 2, and the spoiler 3 is fixedly installed through the mounting groove 2, and when the blade body 1 rotates, the air is cut through the leading edge of the blade body 1, so that the air flows from the upper and lower sides of the blade body to the trailing edge, and is close to the blade body The airflow on the outer surface of the spoiler 3 flows along the outer surface of the spoiler 3, and is first disturbed by a number of unevenly distributed spoiler convex points 7, so that the originally smooth airflow flows irregularly. When the irregular airflow flows to the end of the spoiler 3, due to the irregular serrations, the irregularly flowing airflows on both sides of the spoiler 3 collide at different times at the irregular serration trailing edges, thereby making the airflow flow irregularly, weakening the noise generated by the interaction between the airflows in different directions and the trailing edge section of the blade, thereby achieving a reduction in the noise level of the wind turbine blade.

[0024] The shape of the fixing pin 5 is the same as that of the spoiler convex point 7. The two ends of the fixing pin 5 are integrally provided with arc-shaped heads that are in close contact with the blade body 1.

[0025] Working principle:

[0026] When the blade body 1 rotates, the leading edge of the blade body 1 cuts the air, so that the air flows from the upper and lower sides of the blade body to the trailing edge. The airflow close to the outer surface of the blade body 1 flows along the outer surface of the spoiler 3, and is first disturbed by a number of unevenly distributed spoiler convex points 7, so that the originally smooth airflow flows irregularly. When the irregular airflow flows to the end of the spoiler 3, due to the irregular serrations, the irregularly flowing airflows on both sides of the spoiler 3 collide at different times at the irregular serration trailing edges, so that the airflow flows irregularly, weakening the noise generated by the interaction between the airflows in different directions and the trailing edge section of the blade, thereby achieving a reduction in the noise level of the wind turbine blade. When the airflow impacts the spoiler 3 and the spoiler convexities to generate noise, the generated noise vibration is transmitted to the sound absorber 9 inside the through groove 8, and the vibration received by the spoiler convex points 7 is transmitted to the sound absorber 9 through the connecting rod 72. The vibration of the noise is absorbed by the sound absorber 9 to reduce the generation of noise.

[0027] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wind turbine blade structure with high efficiency and noise reduction, comprising a blade body (1), characterized in that: The trailing edge of the blade body (1) is provided with a mounting groove (2), and a spoiler (3) is fixedly mounted on the trailing edge of the blade body (1) through the mounting groove (2); irregular noise reduction serrations (6) are arranged at the end of the spoiler (3); irregularly distributed spoiler convex points (7) are symmetrically arranged on the upper and lower sides of the spoiler (3); a through groove (8) is provided in the middle of the spoiler (3); a sound absorbing body (9) is arranged inside the through groove (8); the spoiler convex point (7) includes arc-shaped protrusions (71) located on the upper and lower sides of the spoiler (3); a connecting rod (72) is integrally arranged between the opposite arc-shaped protrusions (71); and the connecting rod (72) passes through the spoiler (3) and the sound absorbing body (9).

2. The wind turbine blade structure with high efficiency and noise reduction according to claim 1, characterized in that: A connecting strip (4) plugged into the mounting groove (2) is provided on one side of the spoiler (3); a fixing through hole (10) is provided on the connecting strip (4); a fixing pin (5) is provided through the fixing through hole (10); and the connecting strip (4) is fixedly mounted to the trailing edge of the blade body (1) via the fixing pin (5).

3. The wind turbine blade structure with high efficiency and noise reduction according to claim 2, characterized in that: The fixing pin (5) has the same shape as the spoiler convex point (7), and both ends of the fixing pin (5) are integrally provided with arc-shaped heads that are in close contact with the blade body (1).

4. The wind turbine blade structure with high efficiency and noise reduction according to claim 1, characterized in that: The upper and lower sides of the spoiler (3) are arcuate surfaces, and the connection between the spoiler (3) and the blade body (1) is smoothly transitioned.

5. The wind turbine blade structure with high efficiency and noise reduction according to claim 1, characterized in that: The sound absorbing body (9) is a porous sound absorbing foam with a waterproof fiber cloth wrapped on the outside.

6. The wind turbine blade structure with high efficiency and noise reduction according to claim 1, characterized in that: The thickness of the spoiler (3) gradually decreases from an end close to the trailing edge of the blade body (1) to an end far from the mounting groove (2).

7. The wind turbine blade structure with high efficiency and noise reduction according to claim 1, characterized in that: The irregular edge of the noise reduction sawtooth (6) is in a gentle arc shape.

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