Blade structure of vertical axis wind turbine

Abstract

The invention discloses a vertical axis wind turbine blade structure, which relates to the field of wind power generation, and comprises a basic platform, a rotating rack, two blade bodies and two linear telescopic components, the rotating rack is rotatably mounted on the upper part of the basic platform, the bottom end of each blade body is hinged to the upper part of the rotating rack, and the two blade bodies are symmetrically arranged; the lower end of each linear telescopic component is hinged to the lower portion of the rotating rack, and the upper end of each linear telescopic component is hinged to the outer side of one blade body. According to the blade structure of the vertical-axis wind driven generator, the blade tip speed ratio and the sweeping area can be changed, the utilization hours of the wind driven generator are increased, and the survival wind speed of the wind driven generator is increased.

Description

Technical Field

[0001] This invention relates to the field of wind power generation, and in particular to a vertical axis wind turbine blade structure. Background Technology

[0002] The current problem with vertical axis wind turbines is that they cannot change the tip speed ratio or the swept area, resulting in a low annual utilization of the turbines. Furthermore, the turbines are subjected to excessive stress and are damaged when the wind speed is too high, and their survival wind speed is very low. Summary of the Invention

[0003] To address the above technical problems, this invention provides a vertical axis wind turbine blade structure that can change the tip speed ratio and swept area, thereby increasing the utilization hours of the wind turbine and its survival wind speed.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a vertical axis wind turbine blade structure, including a base platform, a rotating frame, two blade bodies, and two linear telescopic components. The rotating frame is rotatably mounted on the upper part of the base platform. The bottom end of each blade body is hinged to the upper part of the rotating frame, and the two blade bodies are symmetrically arranged. The lower end of each linear telescopic component is hinged to the lower part of the rotating frame, and the upper end of each linear telescopic component is hinged to the outside of one of the blade bodies.

[0006] Preferably, the system further includes a slewing bearing, the inner ring of which is fixed to the base platform, and the outer ring of which is fixed to the bottom of the rotating frame.

[0007] Preferably, it further includes two rotating shafts, which are symmetrically arranged on both sides of the upper part of the rotating frame, and the axial directions of the two rotating shafts are parallel. The bottom end of each blade body is fixedly installed on one of the rotating shafts.

[0008] Preferably, it further includes two first supports, which are symmetrically arranged on both sides of the lower part of the rotating frame, and the lower end of each linear telescopic component is hinged to one of the first supports.

[0009] Preferably, it further includes two second supports, one of which is provided on the outer side of the lower part of each blade body, and the upper end of each linear telescopic component is hinged to one of the second supports.

[0010] Preferably, the linear telescopic component is a hydraulic cylinder, and both ends of each hydraulic cylinder are respectively hinged to a first support and a second support.

[0011] Preferably, the cylinder body of each hydraulic cylinder is hinged to a first support, and the piston rod of each hydraulic cylinder is hinged to a second support.

[0012] Preferably, the rotating frame includes a top support, a bottom support, and multiple connecting rods. The upper and lower ends of each connecting rod are respectively connected to the top support and the bottom support. The bottom end of each blade body is hinged to the top support, and the lower end of each linear telescopic component is hinged to the bottom support.

[0013] Preferably, each of the connecting rods is inclined inward from bottom to top.

[0014] The present invention achieves the following technical effects compared to the prior art:

[0015] The vertical axis wind turbine blade structure of this invention can adjust the angle between the two blade bodies by extending and retracting the linear telescopic component. Starting at a lower wind speed, as the wind speed increases, the angle between the two blade bodies increases by retracting the linear telescopic component. This keeps the wind turbine speed essentially constant even with increased wind speed, thereby changing the tip speed ratio and maintaining the asynchronous wind turbine speed at a level above the synchronous speed. When the wind speed exceeds the rated wind speed, in order to utilize more wind energy while protecting the wind turbine from overload, the angle between the two blade bodies needs to be gradually reduced according to the wind speed. This reduces the swept area, thereby reducing power and increasing the utilization hours of the wind turbine. This not only increases the annual power generation but also significantly increases the wind speed at which the wind turbine can survive. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of the vertical axis wind turbine blade provided by the present invention when the included angle between the two blade bodies is 90°.

[0018] Figure 2 This is a schematic diagram of the structure of a vertical axis wind turbine blade provided by the present invention when the included angle between the two blade bodies is an acute angle.

[0019] Explanation of reference numerals in the attached drawings: 100, Vertical axis wind turbine blade structure; 1, Foundation platform; 2, Slewing bearing; 3, Rotating frame; 31, Bottom support; 32, Top support; 33, Connecting rod; 4, Blade body; 5, Rotating shaft; 6, Linear telescopic component; 7, First support; 8, Second support. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a vertical axis wind turbine blade structure that can change the tip speed ratio and swept area, thereby increasing the utilization hours of the wind turbine and the survival wind speed of the wind turbine.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1-2 As shown, this embodiment provides a vertical axis wind turbine blade structure 100, including a base platform 1, a rotating frame 3, two blade bodies 4, and two linear telescopic components 6. The rotating frame 3 is rotatably mounted on the upper part of the base platform 1. The bottom end of each blade body 4 is hinged to the upper part of the rotating frame 3, and the two blade bodies 4 are symmetrically arranged. The lower end of each linear telescopic component 6 is hinged to the lower part of the rotating frame 3, and the upper end of each linear telescopic component 6 is hinged to the outside of one blade body 4, and the two linear telescopic components 6 are symmetrically arranged. During operation, the blade body 4 captures wind energy, driving the rotating frame 3 to rotate. When the linear telescopic components 6 extend and retract, the bottom end of the blade body 4 rotates relative to the rotating frame 3, thereby changing the included angle between the two blade bodies 4.

[0024] In this embodiment, the linear telescopic component 6 is connected to the PLC. The PLC controls the two linear telescopic components 6 to extend and retract synchronously, thereby adjusting the included angle between the two blade bodies 4. The change in the included angle between the two blade bodies 4 can change the swept area. When the included angle between the two blade bodies 4 is 90°, the swept area reaches its maximum value, so that the wind turbine power reaches its maximum value.

[0025] In this embodiment, an asynchronous wind turbine is installed, which needs to reach synchronous speed to generate electricity. When the wind speed is low, such as 4 m / s, the wind turbine is started, and the included angle between the two blade bodies 4 is initially at... Figure 2 At the location shown, as the wind speed gradually increases, the PLC performs calculations and gradually adjusts the included angle between the two blade bodies 4 according to the wind speed. By contracting the two linear telescopic components 6, the included angle between the two blade bodies 4 is increased. That is, even when the wind speed increases, the wind turbine speed remains basically unchanged, thereby changing the tip speed ratio and maintaining the asynchronous wind turbine speed basically unchanged, both above the synchronous speed. In other words, the rotational speed of the wind turbine meets the requirements for power generation.

[0026] When the rated wind speed reaches 12-15 m / s, the included angle between the two blade bodies 4 is adjusted using the linear telescopic component 6. Figure 1 At a 90° angle, the swept area reaches its maximum, and the wind turbine's power reaches its maximum. If the wind speed increases further, exceeding the rated wind speed by 12-15 m / s, to utilize more wind energy while protecting the wind turbine from overload, the angle between the two blade bodies 4 needs to be gradually reduced according to the wind speed. This reduces the swept area, thereby reducing power. By reducing the swept area when the wind speed exceeds the rated wind speed, excessive stress on the generator due to high wind speeds can be avoided, allowing the wind turbine to operate even at high wind speeds. This increases the wind turbine's utilization hours, not only increasing annual power generation but also significantly increasing the wind speed at which the wind turbine can survive. The angle between the two blade bodies 4 is adjusted to [a specific angle] when the wind speed increases to 30 m / s. Figure 2 The position is shown. Conversely, when the wind speed decreases, the angle between the two blade bodies 4 can be adjusted in the opposite direction.

[0027] This embodiment also includes a slewing bearing 2, the inner ring of which is fixed to the base platform 1, and the outer ring of which is fixed to the bottom of the rotating frame 3, thereby allowing the rotating frame 3 to be rotatably mounted on the base platform 1.

[0028] This embodiment also includes two rotating shafts 5, which are symmetrically arranged on both sides of the upper part of the rotating frame 3. The axes of the two rotating shafts 5 are parallel, and the bottom end of each blade body 4 is fixedly installed on one of the rotating shafts 5. When the linear telescopic component 6 extends or retracts, it causes the rotating shafts 5 to rotate relative to the rotating frame 3, thereby changing the angle between the blade body 4 and the rotating frame 3.

[0029] This embodiment also includes two first supports 7, which are symmetrically arranged on both sides of the lower part of the rotating frame 3, and the lower end of each linear telescopic component 6 is hinged to a first support 7.

[0030] This embodiment also includes two second supports 8. Each blade body 4 has a second support 8 on its lower outer side, and the upper end of each linear telescopic component 6 is hinged to a second support 8.

[0031] In this embodiment, the linear telescopic component 6 is a hydraulic cylinder, and both ends of each hydraulic cylinder are respectively hinged to a first support 7 and a second support 8.

[0032] Specifically, the cylinder body of each hydraulic cylinder is hinged to a first support 7, and the piston rod of each hydraulic cylinder is hinged to a second support 8. The angle between the two blade bodies 4 is adjusted by extending and retracting the piston rod. When the piston rod extends, the angle between the two blade bodies 4 decreases; when the piston rod retracts, the angle between the two blade bodies 4 increases.

[0033] Specifically, the rotating frame 3 includes a top support 32, a bottom support 31 and multiple connecting rods 33. The upper and lower ends of each connecting rod 33 are respectively connected to the top support 32 and the bottom support 31. The bottom end of each blade body 4 is hinged to the top support 32, and the lower end of each linear telescopic component 6 is hinged to the bottom support 31.

[0034] In this embodiment, two rotating shafts 5 are symmetrically arranged on both sides of the top bracket 32, two first supports 7 are symmetrically arranged on both sides of the bottom bracket 31, and the outer ring of the slewing bearing 2 is fixed to the bottom of the bottom bracket 31.

[0035] In this specific embodiment, each connecting rod 33 is inclined inward from bottom to top, thereby leaving room for the linear telescopic component 6 to move on both sides of the rotating frame 3.

[0036] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A vertical axis wind turbine blade structure, characterized in that, The device includes a base platform, a rotating frame, two blade bodies, and two linear telescopic components. The rotating frame is rotatably mounted on the upper part of the base platform. The bottom end of each blade body is hinged to the upper part of the rotating frame, and the two blade bodies are symmetrically arranged. The lower end of each linear telescopic component is hinged to the lower part of the rotating frame, and the upper end of each linear telescopic component is hinged to the outside of one of the blade bodies.

2. The vertical axis wind turbine blade structure according to claim 1, characterized in that, It also includes a slewing bearing, the inner ring of which is fixed to the base platform, and the outer ring of which is fixed to the bottom of the rotating frame.

3. The vertical axis wind turbine blade structure according to claim 1, characterized in that, It also includes two rotating shafts, which are symmetrically arranged on both sides of the upper part of the rotating frame, and the axial directions of the two rotating shafts are parallel. The bottom end of each blade body is fixedly installed on one of the rotating shafts.

4. The vertical axis wind turbine blade structure according to claim 1, characterized in that, It also includes two first supports, which are symmetrically arranged on both sides of the lower part of the rotating frame, and the lower end of each linear telescopic component is hinged to one of the first supports.

5. The vertical axis wind turbine blade structure according to claim 4, characterized in that, It also includes two second supports, one of which is provided on the outer side of the lower part of each blade body, and the upper end of each linear telescopic component is hinged to one of the second supports.

6. The vertical axis wind turbine blade structure according to claim 5, characterized in that, The linear telescopic component is a hydraulic cylinder, and both ends of each hydraulic cylinder are respectively hinged to a first support and a second support.

7. The vertical axis wind turbine blade structure according to claim 6, characterized in that, The cylinder body of each hydraulic cylinder is hinged to a first support, and the piston rod of each hydraulic cylinder is hinged to a second support.

8. The vertical axis wind turbine blade structure according to claim 1, characterized in that, The rotating frame includes a top support, a bottom support, and multiple connecting rods. The upper and lower ends of each connecting rod are respectively connected to the top support and the bottom support. The bottom end of each blade body is hinged to the top support, and the lower end of each linear telescopic component is hinged to the bottom support.

9. The vertical axis wind turbine blade structure according to claim 8, characterized in that, Each of the connecting rods is inclined inward from bottom to top.

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