Speed-limiting protection blade of vertical-axis wind turbine

Abstract

The utility model provides a speed-limiting protection blade of a vertical axis wind turbine, which comprises a blade frame, a supporting column horizontally arranged on the inner side of the blade frame, a rotating seat rotatably arranged on the supporting column, an upper frame body arranged at the top of the rotating seat, a lower frame body arranged at the bottom of the rotating seat, an upper wind receiving part arranged on the inner side of the upper frame body, and a lower wind receiving part arranged on the inner side of the lower frame body. A lower wind receiving part is arranged on the inner side of the lower frame body, and the area of the lower wind receiving part is larger than that of the upper wind receiving part; the supporting column is further rotationally sleeved with a movable piece, the movable piece is located between the rotating base and the blade frame, a first elastic piece is arranged between the movable piece and the rotating base, the two ends of the first elastic piece are fixedly connected with the movable piece and the rotating base respectively, an extension arm is arranged on the side portion of the movable piece, and a vertical arm perpendicular to the extension arm is arranged on the side portion of the extension arm. And an anti-rotation seat is arranged at the side part of the blade frame. According to the speed-limiting protection blade of the vertical-axis wind turbine, the using effect can be better.

Description

Technical Field

[0001] The utility model belongs to the technical field of vertical axis wind power generation, and relates to a speed limiting protection blade of a vertical axis wind generator. Background Art

[0002] Vertical-axis wind turbines don't need to face the wind when the wind direction changes, which is a major advantage over horizontal-axis wind turbines. This not only simplifies the structural design but also reduces the gyroscopic force on the rotor when it faces the wind. Vertical-axis wind turbines are primarily categorized as drag-type and lift-type. Drag-type vertical-axis wind turbines primarily use the drag generated by air flowing over the blades as their driving force, while lift-type vertical-axis wind turbines use the lift generated by air flowing over the blades as their driving force.

[0003] Currently, one type of vertical-axis wind turbine on the market primarily comprises a central column and a blade rack rotatably connected to the column. Each blade rack has multiple blade units. During power generation, the blade rack transmits power, which, after passing through a speed-increasing gearbox, drives the generator to rotate, thereby generating electricity. The blade units comprise a blade frame, and upper and lower blade portions rotatably connected within the blade frame. The upper blade portion is smaller in area than the lower blade portion, and a block is provided at the bottom of the blade frame to unidirectionally limit the lower blade portion. During power generation, if the blade frame faces the windward side, the lower blade portion is limited by the block and cannot rotate, allowing both the upper and lower blade portions to be affected by the wind. If the blade frame faces the windward side, the lower blade portion, due to its larger area, is affected by a greater wind force, and the block does not limit the lower blade portion. This allows the upper and lower blade portions to rotate to a certain angle, allowing wind to pass through the blade frame with minimal resistance, thus enabling the entire blade frame to rotate and generate electricity. However, in actual use, it was found that some areas or seasons will have strong winds (such as coastal cities), which will cause the windward side to generate a large force relative to the upwind side, causing the blade frame to rotate too fast. In severe cases, it may even damage the entire vertical axis generator, resulting in poor performance. Utility Model Content

[0004] The purpose of the utility model is to provide a speed limiting protection blade for a vertical axis wind turbine, aiming to solve the problem of poor use effect.

[0005] In order to solve the above technical problems, the utility model provides a speed limiting protection blade of a vertical axis wind turbine, comprising a blade frame, a support column is horizontally arranged on the inner side of the blade frame, a rotating seat is rotatably arranged on the support column, an upper frame is arranged on the top of the rotating seat, and a lower frame is arranged on the bottom, an upper wind receiving portion is arranged on the inner side of the upper frame, and a lower wind receiving portion is arranged on the inner side of the lower frame, and the area of ​​the lower wind receiving portion is larger than that of the upper wind receiving portion;

[0006] A movable member is rotatably sleeved on the support column, and the movable member is located between the rotating seat and the blade frame. A first elastic member is provided between the movable member and the rotating seat, and both ends of the first elastic member are fixedly connected to the movable member and the rotating seat respectively. An extension arm is provided on the side of the movable member, and a vertical arm perpendicular to the extension arm is provided on the side of the extension arm. An anti-rotation seat is provided on the side of the blade frame;

[0007] The lower wind-receiving portion includes a wind-receiving state and a return state;

[0008] When the lower wind receiving portion is in the wind receiving state, airflow acts on the side of the lower wind receiving portion facing away from the anti-rotation seat, and pressure exists between the vertical arm and the anti-rotation seat, and the angle between the plane where the lower wind receiving portion is located and the vertical plane is α;

[0009] When the lower wind receiving portion is in the return state, the airflow acts on the side of the lower wind receiving portion close to the anti-rotation seat, and the vertical arm and the anti-rotation seat are in a separated state, and the angle between the plane where the lower wind receiving portion is located and the vertical plane is β, where α<β.

[0010] The utility model is further configured such that the vertical arm includes a vertical portion connected to the extension arm and a rotating portion rotatably connected to the outer wall of the vertical portion; when the lower wind-receiving portion is in the wind-receiving state, the rotating portion abuts against the anti-rotation seat.

[0011] The present invention is further configured such that a buffer portion is provided at the bottom of the anti-rotation seat, and the side of the buffer portion facing away from the blade frame is arc-shaped. When the lower wind receiving portion is in the return state, the rotating portion moves against the arc-shaped portion of the buffer portion facing away from the blade frame.

[0012] The utility model is further configured such that lifting bars are vertically provided on both sides of the anti-rotation seat and the buffer portion, the lifting bars are movably fitted to the blade frame, two lifting rails with L-shaped cross sections are vertically provided on the blade frame, each of the lifting bars is movably fitted to the inner wall of one of the lifting rails, and a control rod for controlling the height of the anti-rotation seat is vertically provided on the top of the anti-rotation seat.

[0013] The present invention is further configured such that the outer wall of the control rod is provided with an end portion, the outer wall of the blade frame is provided with a guide seat, the control rod moves through the guide seat, and the outer wall of the control rod moves in contact with the guide seat, the end portion is located above the guide seat, and when the end portion contacts the top of the guide seat, the rotating portion can move in contact with the arc-shaped portion of the buffer portion away from the blade frame.

[0014] The present invention is further configured such that a second elastic member which is continuously in a compressed state is provided between the bottom of the guide seat and the top of the anti-rotation seat.

[0015] The utility model is further configured such that a connecting portion is vertically provided at the bottom of the buffer portion, the bottom of the connecting portion is flush with the bottom of the blade frame, the top of the control rod is flush with the top of the blade frame, and the connecting portion located above is fixedly connected to the control rod located below.

[0016] The present invention is further configured such that two rotating seats are provided.

[0017] Compared with the prior art, the present invention provides a speed limiting protection blade for a vertical axis wind turbine. When in use, the present invention first has several blade racks on the periphery of the column, and then has multiple blade frames on each blade rack, and the multiple blade frames are evenly distributed horizontally and vertically.

[0018] During wind power generation, if the lower wind receiving portion on one side is in a wind-receiving state, airflow acts on the side of the lower wind receiving portion and the upper wind receiving portion away from the anti-rotation seat; wherein, due to the larger area of ​​the lower wind receiving portion, the lower wind receiving portion and the upper wind receiving portion have a certain tendency to rotate upward together, but at this time, due to the vertical arm contacting the anti-rotation seat, the vertical arm and the extension arm prevent the movable member from rotating relative to the support column; however, since the rotating seat can rotate relative to the support column, the first elastic member (similar to a torsion spring, which is only schematic in the figure and does not represent the actual mechanism) applies a certain force to the rotating seat to prevent it from rotating easily, so that the upper frame and the lower frame can withstand wind force and have a certain deflection angle α. In actual design, the elastic coefficient of the first elastic member can be designed so that when it is under a set wind speed, the deflection angle α is small and can generate a large wind thrust; for example, when it is designed at 6-pole wind speed or below, the first elastic member can make the deflection angle α very small and generate sufficient wind thrust. However, if the wind force is greater than the design wind force at a certain moment or time period, such as reaching 8-pole wind, the deflection angle α at this time is large enough to facilitate air passing through the blade frame, thus preventing the wind thrust from being too large and protecting the blade (unit).

[0019] At the same time, when the blade frame rotates 180 degrees to the return state, the airflow acts on the lower wind receiving part and the side of the lower wind receiving part close to the anti-rotation seat. At this time, the wind force received by the lower wind receiving part is greater than the wind force of the upper wind receiving part. At the same time, the anti-rotation seat does not produce resistance to the vertical arm, so that the upper frame and the lower frame are rotated. At the same time, the rotating seat also drives the movable part, the extension arm and the vertical arm to rotate through the first elastic part, and produces a smaller return resistance, so that the entire blade frame can rotate smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0021] Figure 2 yes Figure 1 Enlarged view of part A;

[0022] Figure 3 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0023] Figure 4 yes Figure 3 Enlarged view of part B;

[0024] Figure 5 This is a schematic diagram of the structure of the utility model Figure 3 ;

[0025] Figure 6 It is a schematic diagram of the movable part of the utility model;

[0026] Figure 7 It is a schematic diagram of the anti-rotation seat and the buffer portion of the utility model.

[0027] Among them, 1. blade frame; 2. support column; 3. rotating seat; 4. upper frame; 5. lower frame; 6. upper wind receiving part; 7. lower wind receiving part; 8. movable part; 9. first elastic part; 10. extension arm; 11. vertical arm; 11a. vertical part; 11b. rotating part; 12. anti-rotation seat; 13. buffer part; 14. lifting strip; 15. lifting rail; 16. control rod; 17. termination part; 18. guide seat; 19. second elastic part; 20. connecting part. DETAILED DESCRIPTION

[0028] The following, combined with the accompanying drawings and specific embodiments, further details the speed-limiting protective blade for a vertical-axis wind turbine proposed by the present invention. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are highly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention. Identical or similar reference numerals in the drawings represent identical or similar components.

[0029] A speed limiting protection blade for a vertical axis wind turbine, such as Figures 1 to 7 As shown, it includes a blade frame 1, a support column 2 is horizontally provided on the inner side of the blade frame 1, a rotating seat 3 is rotatably provided on the support column 2, an upper frame body 4 is provided on the top of the rotating seat 3, and a lower frame body 5 is provided on the bottom. An upper wind receiving portion 6 is provided on the inner side of the upper frame body 4, and a lower wind receiving portion 7 is provided on the inner side of the lower frame body 5. The area of ​​the lower wind receiving portion 7 is larger than that of the upper wind receiving portion 6;

[0030] A movable member 8 is also rotatably sleeved on the support column 2, and the movable member 8 is located between the rotating seat 3 and the blade frame 1. A first elastic member 9 is provided between the movable member 8 and the rotating seat 3, and the two ends of the first elastic member 9 are respectively fixedly connected to the movable member 8 and the rotating seat 3. An extension arm 10 is provided on the side of the movable member 8, and a vertical arm 11 perpendicular to the extension arm 10 is provided on the side of the extension arm 10. An anti-rotation seat 12 is provided on the side of the blade frame 1;

[0031] The lower wind receiving portion 7 includes a wind receiving state and a return state;

[0032] When the lower wind receiving portion 7 is in the wind receiving state, airflow acts on the side of the lower wind receiving portion 7 facing away from the anti-rotation seat 12, and pressure exists between the vertical arm 11 and the anti-rotation seat 12. The angle between the plane where the lower wind receiving portion 7 is located and the vertical plane is α;

[0033] When the lower wind receiving portion 7 is in the return state, the airflow acts on the side of the lower wind receiving portion 7 close to the anti-rotation seat 12, and the vertical arm 11 and the anti-rotation seat 12 are in a separated state, and the angle between the plane where the lower wind receiving portion 7 is located and the vertical plane is β, where α<β.

[0034] The vertical arm 11 includes a vertical portion 11 a connected to the extension arm 10 and a rotating portion 11 b rotatably connected to the outer wall of the vertical portion 11 a . When the lower wind receiving portion 7 is in the wind receiving state, the rotating portion 11 b abuts against the anti-rotation seat 12 .

[0035] A buffer portion 13 is provided at the bottom of the anti-rotation seat 12 , and the side of the buffer portion 13 away from the blade frame 1 is arc-shaped. When the lower wind receiving portion 7 is in the return state, the rotating portion 11b moves against the arc-shaped portion of the buffer portion 13 away from the blade frame 1 .

[0036] Lifting bars 14 are vertically provided on both sides of the anti-rotation seat 12 and the buffer portion 13. The lifting bars 14 are movably fitted to the blade frame 1. Two lifting rails 15 with L-shaped cross sections are vertically provided on the blade frame 1. Each of the lifting bars 14 is movably fitted to the inner wall of one of the lifting rails 15. A control rod 16 for controlling the height of the anti-rotation seat 12 is vertically provided on the top of the anti-rotation seat 12.

[0037] The outer wall of the control rod 16 is provided with a termination portion 17, and the outer wall of the blade frame 1 is provided with a guide seat 18. The control rod 16 moves through the guide seat 18, and the outer wall of the control rod 16 moves and fits the guide seat 18. The termination portion 17 is located above the guide seat 18. When the termination portion 17 contacts the top of the guide seat 18, the rotating portion 11b can move to contact the arc-shaped portion of the buffer portion 13 away from the blade frame 1.

[0038] A second elastic member 19 that is continuously in a compressed state is provided between the bottom of the guide seat 18 and the top of the anti-rotation seat 12 .

[0039] A connecting portion 20 is vertically provided at the bottom of the buffer portion 13, the bottom of the connecting portion 20 is flush with the bottom of the blade frame 1, the top of the control rod 16 is flush with the top of the blade frame 1, and the connecting portion 20 located above is fixedly connected to the control rod 16 located below.

[0040] There are two rotating seats 3, and the two rotating seats 3 can improve the connection stability between the upper frame 4 and the lower frame 5, and can also improve the connection stability with the support column 2; and in actual use, the first elastic member 9 can be set on only one of the rotating seats 3 according to actual conditions, or the first elastic member 9 can be set on both rotating seats 3.

[0041] The utility model provides a speed limiting protection blade for a vertical axis wind turbine. When in use, the utility model first has a plurality of blade racks on the periphery of a column, and then has a plurality of blade frames 1 on each blade rack, and the plurality of blade frames 1 are evenly distributed horizontally and vertically.

[0042] During wind power generation, if the lower wind receiving part 7 on one side is in a wind-receiving state, the airflow acts on the side of the lower wind receiving part 7 and the upper wind receiving part 6 away from the anti-rotation seat 12; since the area of ​​the lower wind receiving part 7 is larger, the lower wind receiving part 7 and the upper wind receiving part 6 have a certain tendency to rotate upward, but at this time, since the vertical arm 11 is in contact with the anti-rotation seat 12, the movable part 8 cannot rotate relative to the support column 2 through the vertical arm 11 and the extension arm 10; but since the rotating seat 3 can rotate relative to the support column 2, the first elastic member 9 (similar to a torsion spring, which is only a schematic diagram in the figure and does not represent the actual mechanism) applies a certain force to the rotating seat 3 to prevent it from rotating easily. In this way, the upper frame 4 and the lower frame 5 can withstand the wind force and have a certain deflection angle α. During actual design, the elastic coefficient of the first elastic member 9 can be designed so that, at a set wind speed, the deflection angle α is small and a large wind thrust can be generated. For example, when the wind speed is set to 6 poles or below, the first elastic member 9 can keep the deflection angle α very small and generate sufficient wind thrust. However, if the wind speed at a certain moment or time period exceeds the design wind speed, such as reaching 8 poles, the deflection angle α at this time will be large enough to facilitate air passing through the blade frame 1. This can prevent excessive wind thrust and protect the blades (units).

[0043] At the same time, when the blade frame 1 rotates 180 degrees to the return state, the airflow acts on the lower wind receiving part 7 and the side of the lower wind receiving part 7 close to the anti-rotation seat 12. At this time, the wind force received by the lower wind receiving part 7 is greater than the wind force of the upper wind receiving part 6. At the same time, the anti-rotation seat 12 does not produce resistance to the vertical arm 11, so that the upper frame 4 and the lower frame 5 are rotated. At the same time, the rotating seat 3 also drives the movable part 8, the extension arm 10 and the vertical arm 11 to rotate through the first elastic part 9, and produces a smaller return resistance, so that the entire blade frame can rotate smoothly. In the present application, it is preferred that when there is no wind, the first elastic member 9 is in its original length or original unstressed state. At this time, under the action of gravity, the upper frame 4 and the lower frame 5 are both in a vertical state. Then, when blown by wind, whether it is in the wind-receiving state or the return state, there is an angle between the lower frame 5 and the vertical plane. The difference is that in the return state, the angle β is larger and the wind thrust is smaller; while in the wind-receiving state, at the set wind level and below, the deflection angle α is larger, which can generate sufficient wind thrust, but if the wind force is above the set level, the deflection angle α will also be larger, thereby preventing the blade frame 1 from being subjected to excessive wind thrust in the wind-receiving state, and at the same time preventing the blade frame from rotating too fast, thereby improving the safety factor of use and protecting the vertical axis wind turbine.

[0044] The upper wind receiving portion 6 and the lower wind receiving portion 7 are both in the form of thin films, are large in size and light in weight, and can withstand wind force well. At the same time, according to actual conditions, cables can be set in the upper frame 4 and the lower frame 5, and the two ends of the cables are connected to the upper frame 4 or the lower frame 5, and the middle part is attached to the side of the upper wind receiving portion 6 or the lower wind receiving portion 7, and plays a supporting role for the upper wind receiving portion 6 or the lower wind receiving portion 7. At the same time, both sides of the upper frame 4 and the lower frame 5 are attached to the inner walls on both sides of the blade frame 1, which improves the position and activity stability of the upper frame 4 and the lower frame 5. However, there is a certain gap between the top of the upper frame 4 and the bottom of the lower frame 5 and the blade frame 1, so that the upper frame 4 and the lower frame 5 can rotate.

[0045] When the movable part 8 has a tendency to rotate in the wind-exposed state, it applies pressure to the anti-rotation seat 12 through the extension arm 10, the vertical portion 11a and the rotating portion 11b. Since the anti-rotation seat 12 cannot be deformed, the angle of the extension arm 10, the vertical portion 11a, the rotating portion 11b and the movable part 8 is guaranteed. However, in the return state, the first elastic member 9 drives the movable part 8, the extension arm 10, the vertical portion 11a and the rotating portion 11b to rotate downward relative to the anti-rotation seat 12, that is, to rotate toward the buffer portion 13; in this rotation direction, since the buffer portion 13 is arc-shaped, the rotating portion 11b can directly transition from the anti-rotation seat 12 to the buffer portion 13, so that the movable part 8 does not apply resistance to the rotating seat 3, that is, at this time the upper frame 4 and the lower frame 5 can rotate more easily through a larger angle, facilitating the passage of air.

[0046] Since the rotating portion 11b and the vertical portion 11a rotate relative to each other, the rotating portion 11b rolls when in motion, which can effectively reduce the wear of each structure. At the same time, the rotating portion 11b has a certain flexibility and deformability (preferably made of materials such as hard rubber or silicone), and there is interference between the rotating portion 11b and the anti-rotation seat 12 and the buffer portion 13, that is, the rotating portion 11b has a certain elastic deformation; therefore, when the rotating portion 11b moves on the buffer portion 13, the buffer portion 13 can also play a role in buffering and consuming kinetic energy for the rotating portion 11b, preventing excessive collision between the rotating portion 11b and the associated portion 20. When the rotating portion 11b contacts the anti-rotation seat 12, the rotating portion 11b can also undergo a certain deformation, preventing excessive stress from being generated between the anti-rotation portion and the rotating portion 11b, thereby protecting both.

[0047] The anti-rotation seat 12 and the buffer portion 13 are both able to move vertically along the length of the lifting rail 15. When the wind force is less than a set value, the elastic force of the second elastic member 19 and the gravity of the anti-rotation seat 12, the buffer portion 13, etc. cause the end portion 17 to abut against the top of the guide seat 18, and the anti-rotation seat 12 and the buffer portion 13 are at their lowest height. Then, when the wind force is greater than the set value, all the control rods 16 are raised by a mechanism at the top or bottom of the blade frame (such as an electric push rod generated by solar energy, or manual adjustment by a worker), and the anti-rotation seat 12 and the buffer portion 13 are both raised until they reach a position where neither the buffer portion 13 nor the anti-rotation seat 12 affects the rotation of the vertical arm 11 (the figure is only for reference and does not represent the actual structure). Afterwards, even in the wind-receiving state, the upper frame 4 and the lower frame 5 can rotate freely without being resisted by the first elastic member 9. In this way, whether in the wind-receiving state or the return state, the blade frame 1 is in a relatively open state, that is, the air can pass through the blade frame 1 very conveniently at this time. In this way, the wind thrust in the wind-receiving state and the return state is very small, which can effectively prevent the blade frame from rotating too fast or even damaging the equipment.

[0048] The blade frame 1 on the blade rack has several strips in the longitudinal direction, and the top of the control rod 16 on each strip is connected to the bottom of the joint portion 20 above it. In this way, each row of blade frames 1 only needs to control the control rod 16 at the top to lift and lower, so that the position of all the anti-rotation seats 12 in a row can be controlled, which makes control simpler and more cost-effective. It should also be understood that what is claimed in this application is the structures such as the blade frame 1 and the control rod 16. As for what structure and form the control rod 16 is lifted and lowered, it is not the content and object claimed in this application, and no excessive restrictions or details are given here. However, according to actual conditions, an electric push rod can be set at the top of the blade rack, and the control rod 16 at the top can be lifted and lowered by the electric push rod. At the same time, the electric push rod uses solar power generation and has a battery, a wind speed sensor and a controller inside. In this way, when the wind speed is greater than a set value, the anti-rotation seat 12 can be automatically raised.

[0049] At the same time, in actual production, it is preferred to provide a support portion (not shown in the figure) on the side of the top part of the connecting rod close to the blade frame 1, and the support portion is movably attached to the side of the blade frame 1. At the same time, no matter what height the buffer portion 13 is at, as long as the rotating portion 11b contacts the connecting portion 20, the inner side of this part of the connecting portion 20 has a support portion, which can effectively prevent the connecting rod from being deformed.

[0050] The above description is only a description of the preferred embodiment of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A speed limiting protection blade for a vertical axis wind turbine, characterized in that: The invention comprises a blade frame (1), a support column (2) is horizontally arranged on the inner side of the blade frame (1), a rotating seat (3) is rotatably arranged on the support column (2), an upper frame (4) is arranged on the top of the rotating seat (3), and a lower frame (5) is arranged on the bottom, an upper wind receiving portion (6) is arranged on the inner side of the upper frame (4), and a lower wind receiving portion (7) is arranged on the inner side of the lower frame (5), and the area of ​​the lower wind receiving portion (7) is larger than the area of ​​the upper wind receiving portion (6); A movable member (8) is rotatably sleeved on the support column (2), and the movable member (8) is located between the rotating seat (3) and the blade frame (1). A first elastic member (9) is provided between the movable member (8) and the rotating seat (3), and two ends of the first elastic member (9) are fixedly connected to the movable member (8) and the rotating seat (3) respectively. An extension arm (10) is provided on the side of the movable member (8), and a vertical arm (11) perpendicular to the extension arm (10) is provided on the side of the extension arm (10). An anti-rotation seat (12) is provided on the side of the blade frame (1); The lower wind receiving portion (7) includes a wind receiving state and a return state; When the lower wind receiving portion (7) is in the wind receiving state, airflow acts on the side of the lower wind receiving portion (7) away from the anti-rotation seat (12), and pressure exists between the vertical arm (11) and the anti-rotation seat (12), and the angle between the plane where the lower wind receiving portion (7) is located and the vertical plane is α; When the lower wind receiving portion (7) is in the return state, the airflow acts on the side of the lower wind receiving portion (7) close to the anti-rotation seat (12), and the vertical arm (11) and the anti-rotation seat (12) are in a separated state, and the angle between the plane where the lower wind receiving portion (7) is located and the vertical plane is β, where α<β.

2. The speed limiting protection blade of a vertical axis wind turbine according to claim 1, characterized in that: The vertical arm (11) includes a vertical portion (11a) connected to the extension arm (10) and a rotating portion (11b) rotatably connected to the outer wall of the vertical portion (11a). When the lower wind-receiving portion (7) is in the wind-receiving state, the rotating portion (11b) contacts the anti-rotation seat (12).

3. The speed limiting protection blade of a vertical axis wind turbine according to claim 2, characterized in that: A buffer portion (13) is provided at the bottom of the anti-rotation seat (12), and the side of the buffer portion (13) facing away from the blade frame (1) is in an arc shape. When the lower wind receiving portion (7) is in the return state, the rotating portion (11b) moves against the arc-shaped portion of the buffer portion (13) facing away from the blade frame (1).

4. The speed limiting protection blade of a vertical axis wind turbine according to claim 3, characterized in that: Lifting bars (14) are vertically provided on both sides of the anti-rotation seat (12) and the buffer portion (13), and the lifting bars (14) are movably fitted to the blade frame (1). Two lifting rails (15) with L-shaped cross sections are vertically provided on the blade frame (1), and each of the lifting bars (14) is movably fitted to the inner wall of one of the lifting rails (15). A control rod (16) for controlling the height of the anti-rotation seat (12) is vertically provided on the top of the anti-rotation seat (12).

5. The speed limiting protection blade of a vertical axis wind turbine according to claim 4, characterized in that: The outer wall of the control rod (16) is provided with a termination portion (17), and the outer wall of the blade frame (1) is provided with a guide seat (18). The control rod (16) moves through the guide seat (18), and the outer wall of the control rod (16) moves and fits the guide seat (18). The termination portion (17) is located above the guide seat (18). When the termination portion (17) contacts the top of the guide seat (18), the rotating portion (11b) can move and contact the arc-shaped portion of the buffer portion (13) away from the blade frame (1).

6. The speed limiting protection blade of a vertical axis wind turbine according to claim 5, characterized in that: A second elastic member (19) that is continuously in a compressed state is provided between the bottom of the guide seat (18) and the top of the anti-rotation seat (12).

7. The speed limiting protection blade of a vertical axis wind turbine according to claim 5, characterized in that: A connecting portion (20) is vertically provided at the bottom of the buffer portion (13), the bottom of the connecting portion (20) is flush with the bottom of the blade frame (1), the top of the control rod (16) is flush with the top of the blade frame (1), and the connecting portion (20) located above is fixedly connected to the control rod (16) located below.

8. The speed limiting protection blade of a vertical axis wind turbine according to claim 1, characterized in that: Two rotating seats (3) are provided.

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