A kind of variable pitch device for automatically adjusting the angle of attack of fan blade

Abstract

This utility model relates to the field of wind power generation technology and discloses an automatic pitch converter for adjusting the angle of attack of the blades. It includes: a pitch converter base, which is rectangular in shape; an angle of attack fixing structure, comprising a first connecting part and a second connecting part. The first connecting part further includes two sets of first mounting holes opened inside the pitch converter base, with buffer pads fixedly installed inside the first mounting holes. The pitch converter base also has a set of first positioning holes and a set of second positioning holes. The second connecting part further includes a pitch converter head disposed outside the pitch converter base, with two sets of third mounting holes inside the pitch converter head. This achieves the purpose of installing and fixing the angle of attack fixing component. The buffer pads cushion the rotational movement between the pitch converter base and the pitch converter head, facilitating installation. The angle of attack device enables adaptive adjustment of the angle of attack without external power input and with pure mechanical feedback, improving energy capture efficiency at low wind speeds.

Description

Technical Field

[0001] This utility model belongs to the field of wind power generation technology, specifically, it relates to a pitch converter that automatically adjusts the angle of attack of the wind turbine blades. Background Technology

[0002] In the face of a growing global energy crisis and increasingly severe environmental pollution, wind energy, as a clean and renewable energy source, has attracted widespread attention worldwide for its development and utilization. Wind power generation technology, as a key means of converting wind energy into electricity, has made significant progress after years of development. Wind power generation equipment is mainly divided into two types: horizontal axis wind turbines and vertical axis wind turbines.

[0003] However, current mainstream vertical axis wind turbines still face some unresolved issues in practical applications. One key factor limiting performance improvement is the fixed blade angle of attack. In vertical axis wind turbines, the blade angle of attack refers to the angle between the blade chord and the direction of the incoming wind speed. It directly affects the lift and drag experienced by the blade, thus impacting the wind power conversion efficiency and starting performance of the wind turbine. Mainstream vertical axis wind turbines lack a fixed blade angle of attack, making them unable to adapt to wind speed changes, resulting in difficulty starting at low wind speeds and poor equipment withstandability in severe high-wind-speed weather.

[0004] Therefore, there is an urgent need for an angle-of-attack adaptive adjustment device with no external power input and purely mechanical feedback to improve energy capture efficiency at low wind speeds.

[0005] In view of this, this utility model is proposed. Utility Model Content

[0006] To solve the aforementioned technical problem of fixed angle of attack without blades, which makes it unable to adapt to changes in wind speed, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] A pitch control unit that automatically adjusts the angle of attack of the wind turbine blades includes:

[0008] The pitch control mount is rectangular in shape.

[0009] The angle-of-attack fixing structure includes a first connecting part and a second connecting part. The first connecting part also includes two sets of first mounting holes opened inside the pitch converter base. A buffer pad is fixedly installed inside the first mounting holes. A set of first positioning holes and a set of second positioning holes are opened inside the pitch converter base. The second connecting part also includes a pitch converter head set outside the pitch converter base. The pitch converter head has two sets of third mounting holes opened inside. A set of buffer pads is fixedly installed inside one set of third mounting holes. Two sets of arc-shaped limiting grooves are opened inside the pitch converter head. Two sets of third positioning holes are opened inside the pitch converter head. The inner wall of the pitch converter head is in close contact with the outer wall of the pitch converter base. The second positioning holes and the third positioning holes are aligned. The arc-shaped limiting grooves are aligned with the first positioning holes.

[0010] In a preferred embodiment of this utility model, the bottom of the pitch converter base is provided with a set of third wear-resistant bushings and a set of fourth wear-resistant bushings. The third wear-resistant bushings are snapped into the bottom of a set of arc-shaped limiting grooves and a first positioning hole, and the fourth wear-resistant bushings are snapped into the bottom of a set of third positioning holes and a second positioning hole. The outside of the pitch converter base is provided with a set of second lower sealing covers and a set of first lower sealing covers. The first lower sealing covers are screwed into the inside of the fourth wear-resistant bushings, and the second lower sealing covers are screwed into the inside of the third wear-resistant bushings.

[0011] In a preferred embodiment of the present invention, a main shaft sleeve is provided on the top of the pitch converter base, and the main shaft sleeve is rotatably installed inside the second positioning hole. A first wear-resistant bushing is provided on the top of the pitch converter base, and the first wear-resistant bushing is snapped onto the top of the second positioning hole and another set of third positioning holes. A main shaft is provided on the top of the first wear-resistant bushing, and the main shaft is helically installed inside the first wear-resistant bushing.

[0012] In a preferred embodiment of the present invention, a second wear-resistant bushing is provided on the top of the pitcher base. The second wear-resistant bushing is snapped into the top of the first positioning hole and another set of arc-shaped limiting slide grooves. A connecting shaft is provided on the top of the second wear-resistant bushing, and the connecting shaft is spirally installed inside the second wear-resistant bushing.

[0013] In a preferred embodiment of this utility model, the top of the pitch control head is provided with two sets of threaded grooves, the top of the pitch control base is provided with an upper sealing cover, the top of the upper sealing cover is provided with two sets of threaded grooves, and two sets of screws are screwed into the inside of the upper sealing cover, the screws being screwed into the top of the pitch control head.

[0014] In a preferred embodiment of this utility model, the pitch converter base has four sets of second mounting holes inside, and the second mounting holes are provided with limiting bolts for spiral mounting with the wind turbine arm.

[0015] In a preferred embodiment of this utility model, the inside of the pitch converter head is provided with two sets of fourth mounting holes, and the inside of the fourth mounting holes is provided with limiting bolts for spiral mounting with the fan blades.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. To achieve the purpose of installing and fixing the angle of attack fixing component, the buffer pad buffers the rotational movement between the pitch generator base and the pitch generator head, which is convenient for installation. The angle of attack device realizes adaptive adjustment of the angle of attack without external power input and with pure mechanical feedback, thereby improving the energy capture efficiency at low wind speeds.

[0018] 2. To achieve the purpose of rotating the device, so that the second and third wear-resistant bushings drive the pitch converter base and pitch converter head to rotate with the main shaft sleeve as the axis, adjust the distance between the wind turbine arm and the blades, dynamically adjust the angle of attack of the blades at different positions, and reduce mechanical fatigue caused by uneven aerodynamic load.

[0019] 3. To achieve the purpose of installing the device between the wind turbine arm and the blades, enabling the device to adaptively adjust the angle of attack. At low wind speeds, the angle of attack of the blades is increased to enhance the lift of the blades and increase the starting torque. At high wind speeds, the angle of attack is reduced to avoid stalling or overspeeding and maintain stable power output. In extreme wind speeds or turbulence, the angle of attack is quickly adjusted to prevent blade overload, excessive vibration or structural damage, thus optimizing the user experience of the device.

[0020] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0021] In the attached diagram:

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the fourth mounting hole structure of this utility model;

[0024] Figure 3 This is a schematic diagram showing the disassembled parts of this utility model;

[0025] Figure 4 This is a schematic diagram of the second mounting hole structure of this utility model;

[0026] Figure 5 This is a side view of the present invention;

[0027] Figure 6 This is a cross-sectional view of the present invention.

[0028] In the diagram: 10. Pitcher base; 11. Pitcher head; 12. First positioning hole; 13. Second positioning hole; 14. First mounting hole; 15. Arc-shaped limiting groove; 16. Spindle sleeve; 17. First wear-resistant bushing; 18. Spindle; 19. Second wear-resistant bushing; 20. Connecting shaft; 21. Third wear-resistant bushing; 22. Fourth wear-resistant bushing; 23. First lower sealing cover; 24. Buffer pad; 25. Upper sealing cover; 26. Screw; 27. Second mounting hole; 28. Second lower sealing cover; 29. ​​Third mounting hole; 30. Fourth mounting hole; 31. Third positioning hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0030] Example 1: A pitch converter that automatically adjusts the angle of attack of the wind turbine blades, specifically as follows: Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the system includes a pitch control mount 10, which is rectangular in shape; an angle-of-attack fixing structure, which includes a first connecting part and a second connecting part. The first connecting part further includes two sets of first mounting holes 14 formed inside the pitch control mount 10, and a buffer pad 24 is fixedly installed inside the first mounting holes 14. The pitch control mount 10 has a set of first positioning holes 12 and a set of second positioning holes 13 formed inside; the second connecting part also includes a pitch control unit disposed outside the pitch control mount 10. The pitch control head 11 has two sets of third mounting holes 29 inside. A set of buffer pads 24 are fixedly installed inside each set of third mounting holes 29. The pitch control head 11 also has two sets of arc-shaped limiting grooves 15 and two sets of third positioning holes 31 inside. The inner wall of the pitch control head 11 is in close contact with the outer wall of the pitch control base 10. The second positioning hole 13 and the third positioning hole 31 are aligned, and the arc-shaped limiting groove 15 is aligned with the first positioning hole 12. Two sets of buffer pads 24 are fixedly installed inside the first mounting hole 14, and one set of buffer pads 24 is fixedly installed inside the third mounting hole 29. The pitch control base 10 and the pitch control head 11 are installed crosswise, so that the inner wall of the pitch control head 11 is in close contact with the outer wall of the pitch control base 10, the second positioning hole 13 and the third positioning hole 31 are aligned, and the arc-shaped limiting groove 15 is aligned with the first positioning hole 12.

[0031] Based on the above, the structure of the pitch controller base 10, pitch controller head 11, first positioning hole 12, second positioning hole 13, first mounting hole 14, arc-shaped limiting groove 15, buffer pad 24, third mounting hole 29 and third positioning hole 31 achieves the purpose of installing and fixing the angle of attack fixing component. The buffer pad 24 buffers the rotational movement between the pitch controller base 10 and the pitch controller head 11, which facilitates installation. The angle of attack device realizes adaptive adjustment of the angle of attack without external power input and with pure mechanical feedback, thereby improving the energy capture efficiency at low wind speeds.

[0032] Example 2: Based on Example 1, specifically as follows... Figure 3 As shown, the bottom of the pitch generator base 10 is provided with a set of third wear-resistant bushings 21 and a set of fourth wear-resistant bushings 22. The third wear-resistant bushings 21 are snapped into the bottom of a set of arc-shaped limiting grooves 15 and the first positioning hole 12. The fourth wear-resistant bushings 22 are snapped into the bottom of a set of third positioning holes 31 and the second positioning hole 13. The outside of the pitch generator base 10 is provided with a set of second lower sealing covers 28 and a set of first lower sealing covers 23. The first lower sealing covers 23 are screwed into the inside of the fourth wear-resistant bushings 22, and the second lower sealing covers 28 are screwed into the inside of the third wear-resistant bushings 21. The third wear-resistant bushing 21 is snapped into the bottom of a set of arc-shaped limiting grooves 15 and the first positioning hole 12. The fourth wear-resistant bushing 22 is snapped into the bottom of a set of third positioning holes 31 and second positioning holes 13. The first lower sealing cover 23 and the second lower sealing cover 28 are rotated. The first lower sealing cover 23 is screwed into the inside of the fourth wear-resistant bushing 22. The second lower sealing cover 28 is screwed into the inside of the third wear-resistant bushing 21.

[0033] Specifically, such as Figure 3 As shown, a spindle sleeve 16 is provided on the top of the pitch controller base 10. The spindle sleeve 16 is rotatably installed inside the second positioning hole 13. A first wear-resistant bushing 17 is provided on the top of the pitch controller base 10. The first wear-resistant bushing 17 is snapped into the top of the second positioning hole 13 and another set of third positioning holes 31. A spindle 18 is provided on the top of the first wear-resistant bushing 17 and is screwed into the inside of the first wear-resistant bushing 17. The spindle sleeve 16 is rotatably installed inside the second positioning hole 13, and the first wear-resistant bushing 17 is snapped into the top of the second positioning hole 13 and the other set of third positioning holes 31. The spindle 18 is rotated to screw it into the inside of the first wear-resistant bushing 17.

[0034] Specifically, such as Figure 3As shown, a second wear-resistant bushing 19 is provided on the top of the pitch converter base 10. The second wear-resistant bushing 19 is snapped into the top of the first positioning hole 12 and another set of arc-shaped limiting slide grooves 15. A connecting shaft 20 is provided on the top of the second wear-resistant bushing 19, and the connecting shaft 20 is screwed into the inside of the second wear-resistant bushing 19. The second wear-resistant bushing 19 is snapped into the top of the first positioning hole 12 and the other set of arc-shaped limiting slide grooves 15, and the connecting shaft 20 is rotated to screw the connecting shaft 20 into the inside of the second wear-resistant bushing 19.

[0035] Specifically, such as Figure 3 As shown, the top of the pitch control head 11 has two sets of threaded grooves, and the top of the pitch control base 10 is provided with an upper sealing cover 25. The top of the upper sealing cover 25 has two sets of threaded grooves, and two sets of screws 26 are screwed into the inside of the upper sealing cover 25. The screws 26 are screwed into the top of the pitch control head 11. The upper sealing cover 25 is placed on the top of the pitch control head 11, and the screws 26 are rotated to screw the screws 26 into the threaded grooves on the top of the upper sealing cover 25 and the pitch control head 11 in sequence. The upper sealing cover 25 provides a protective cover for the main shaft 18 and the connecting shaft 20.

[0036] Based on the above, the structure of the pitch controller base 10, pitch controller head 11, first positioning hole 12, second positioning hole 13, arc-shaped limiting groove 15, main shaft sleeve 16, first wear-resistant bushing 17, main shaft 18, second wear-resistant bushing 19, connecting shaft 20, third wear-resistant bushing 21, fourth wear-resistant bushing 22, first lower sealing cover 23, upper sealing cover 25, screw 26, second mounting hole 27, second lower sealing cover 28, and third positioning hole 31 achieves the purpose of rotating the device. This allows the second wear-resistant bushing 19 and the third wear-resistant bushing 21 to drive the pitch controller base 10 and the pitch controller head 11 to rotate around the main shaft sleeve 16, adjusting the distance between the wind turbine arm and the blades, dynamically adjusting the angle of attack of the blades at different positions, and reducing mechanical fatigue caused by uneven aerodynamic loads.

[0037] Example 3: Based on Examples 1 and 2, specifically as follows... Figure 1 and Figure 4 As shown, the pitch converter base 10 has four sets of second mounting holes 27 inside, and the second mounting holes 27 are equipped with limiting bolts for spiral mounting with the wind turbine arm. The limiting bolts fix one outer wall of the pitch converter base 10 to the outer wall of the wind turbine arm.

[0038] Specifically, such as Figure 2 and Figure 3 As shown, the pitch control head 11 has two sets of fourth mounting holes 30 inside, and the fourth mounting holes 30 are equipped with limiting bolts for spiral mounting with the fan blades. The limiting bolts fix one outer wall of the pitch control head 11 to the outer wall of the fan blades.

[0039] In summary, the structure of the pitch converter base 10, pitch converter head 11, second mounting hole 27, and fourth mounting hole 30 achieves the purpose of installing the device between the wind turbine arm and the blades. This allows the device to adaptively adjust the angle of attack, increasing the blade angle of attack at low wind speeds to enhance blade lift and starting torque, and decreasing the angle of attack at high wind speeds to avoid stalling or overspeeding and maintain stable power output. In extreme wind speeds or turbulence, the angle of attack can be quickly adjusted to prevent blade overload, excessive vibration, or structural damage, thus optimizing the user experience of the device.

[0040] Working principle: Two sets of buffer pads 24 are fixedly installed in the first mounting holes 14 inside the pitch generator base 10, and one set of buffer pads 24 is fixedly installed in the third mounting hole 29 inside the pitch generator head 11. The buffer pads can buffer and dampen shocks, reducing impact and wear between components. The pitch generator base 10 and the pitch generator head 11 are installed crosswise, so that the inner wall of the pitch generator head 11 is in close contact with the outer wall of the pitch generator base 10. At the same time, ensure that the second positioning hole 13 and the third positioning hole 31 are aligned, and the arc-shaped limiting slide groove 15 is aligned with the first positioning hole 12. This alignment method provides precise positioning for subsequent component installation and blade angle of attack adjustment. The third wear-resistant bushing 21 is snapped into the bottom of the arc-shaped limiting slide groove 15 and the first positioning hole 12, and the fourth wear-resistant bushing 22 is snapped into the bottom of the third positioning hole 31 and the second positioning hole 13. Then rotate the first lower sealing cover 23 and the second lower sealing cover 28, screwing the first lower sealing cover 23 into the inside of the fourth wear-resistant bushing 22, and screwing the second lower sealing cover 28 into the inside of the third wear-resistant bushing 21. The wear-resistant bushings reduce friction between components and extend service life, while the sealing covers provide sealing protection, preventing dust, moisture, etc. from entering the interior. Rotate the main shaft sleeve 16 into the inside of the second positioning hole 13, and snap the first wear-resistant bushing 17 into the top of the second positioning hole 13 and another set of third positioning holes 31. Rotate the main shaft 18 and screw it into the inside of the first wear-resistant bushing 17. At the same time, snap the second wear-resistant bushing 19 into the top of the first positioning hole 12 and another set of arc-shaped limiting grooves 15, and rotate the connecting shaft 20 and screw it into the inside of the second wear-resistant bushing 19. The installation of these components provides a rotating shaft and connecting structure for adjusting the blade angle of attack. The upper sealing cover 25 is placed on top of the pitch control head 11, and the screws 26 are rotated to screw them into the threaded grooves on the top of the upper sealing cover 25 and the pitch control head 11. The upper sealing cover provides a protective cover for the main shaft 18 and connecting shaft 20, further protecting the internal components. A limiting bolt passes through the second mounting hole 27 inside the pitch control base 10, fixing one side of the outer wall of the pitch control base 10 to the outer wall of the wind turbine arm, making the pitch control and wind turbine arm a single unit. A limiting bolt passes through the fourth mounting hole 30 inside the pitch control head 11, fixing one side of the outer wall of the pitch control head 11 to the outer wall of the wind turbine blade, thus connecting the pitch control and the wind turbine blade. Through this installation process, the pitch control forms a complete structural system. In actual wind power generation, when the wind speed changes, the wind force on the blades changes, causing them to rotate around the main shaft 18 and the connecting shaft 20. Due to the restriction of the arc-shaped limiting groove 15, the blades can only rotate within a certain angle range, thereby realizing the automatic adjustment of the blade angle of attack to adapt to different wind speeds and improve wind energy conversion efficiency.

[0041] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A pitch control unit that automatically adjusts the angle of attack of the wind turbine blades, characterized in that, include: The pitch control mount (10) is rectangular in shape. The angle-of-attack fixing structure includes a first connecting part and a second connecting part. The first connecting part also includes two sets of first mounting holes (14) opened inside the pitch converter base (10). A buffer pad (24) is fixedly installed inside the first mounting holes (14). A set of first positioning holes (12) and a set of second positioning holes (13) are opened inside the pitch converter base (10). The second connecting part also includes a pitch converter head (11) disposed outside the pitch converter base (10). The pitch converter head (11) has a... Two sets of third mounting holes (29) are provided. A set of buffer pads (24) are fixedly installed inside one set of third mounting holes (29). Two sets of arc-shaped limiting grooves (15) are provided inside the pitch head (11). Two sets of third positioning holes (31) are provided inside the pitch head (11). The inner wall of the pitch head (11) is in close contact with the outer wall of the pitch base (10). The second positioning hole (13) and the third positioning hole (31) are aligned. The arc-shaped limiting groove (15) is aligned with the first positioning hole (12).

2. The pitch converter for automatically adjusting the angle of attack of the wind turbine blades according to claim 1, characterized in that, The bottom of the pitch generator base (10) is provided with a set of third wear-resistant bushings (21) and a set of fourth wear-resistant bushings (22). The third wear-resistant bushings (21) are snapped into the bottom of a set of arc-shaped limiting grooves (15) and the first positioning hole (12). The fourth wear-resistant bushings (22) are snapped into the bottom of a set of third positioning holes (31) and second positioning holes (13). The outside of the pitch generator base (10) is provided with a set of second lower sealing covers (28) and a set of first lower sealing covers (23). The first lower sealing cover (23) is screwed into the inside of the fourth wear-resistant bushing (22), and the second lower sealing cover (28) is screwed into the inside of the third wear-resistant bushing (21).

3. The pitch converter for automatically adjusting the angle of attack of the wind turbine blades according to claim 1, characterized in that, The top of the pitch converter base (10) is provided with a main shaft sleeve (16), which is rotatably installed inside the second positioning hole (13). The top of the pitch converter base (10) is provided with a first wear-resistant bushing (17), which is snapped onto the top of the second positioning hole (13) and another set of third positioning holes (31). The top of the first wear-resistant bushing (17) is provided with a main shaft (18), which is spirally installed inside the first wear-resistant bushing (17).

4. The pitch converter for automatically adjusting the angle of attack of the wind turbine blades according to claim 1, characterized in that, The top of the pitch converter base (10) is provided with a second wear-resistant bushing (19), which is snapped onto the top of the first positioning hole (12) and another set of arc-shaped limiting slide grooves (15). The top of the second wear-resistant bushing (19) is provided with a connecting shaft (20), which is spirally installed inside the second wear-resistant bushing (19).

5. The pitch converter for automatically adjusting the angle of attack of the wind turbine blades according to claim 1, characterized in that, The top of the pitch generator head (11) is provided with two sets of threaded grooves, and the top of the pitch generator base (10) is provided with an upper sealing cover (25). The top of the upper sealing cover (25) is provided with two sets of threaded grooves, and the interior of the upper sealing cover (25) is screwed with two sets of screws (26). The screws (26) are screwed on the top of the pitch generator head (11).

6. The pitch converter for automatically adjusting the angle of attack of the wind turbine blades according to claim 1, characterized in that, The pitch generator base (10) has four sets of second mounting holes (27) inside, and the second mounting holes (27) are provided with limiting bolts for spiral mounting with the wind turbine arm.

7. The pitch converter for automatically adjusting the angle of attack of the wind turbine blades according to claim 1, characterized in that, The pitch generator head (11) has two sets of fourth mounting holes (30) inside, and the fourth mounting holes (30) are equipped with limit bolts for spiral mounting with the fan blades.

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