Rigid-flexible composite self-adjusting wind driven generator blade

Abstract

The rigid-flexible composite self-adjusting wind driven generator blade comprises rigid-flexible composite blades, the rigid-flexible composite blades are installed on a rotating shaft at equal intervals, and the bottom of the rotating shaft is connected with a generator; four groups of rigid-flexible composite blades are arranged at equal intervals; wherein the rigid-flexible composite blade main body is arc-shaped and is divided into a concave surface and a convex surface, the concave surface is a wind receiving surface, and the convex surface is a wind blocking surface. The flexible blades deform in a self-adaptive mode, and staggered gaps are formed between the flexible blades and the ventilation holes of the rigid blades, so that part of airflow resistance borne by the wind blocking face is released. And the rigid-flexible composite blades have one-way conduction capability on air flow. The device has the characteristic of releasing air resistance by conducting airflow in one direction.

Description

Technical Field

[0001] This invention belongs to the field of wind power generation technology, specifically relating to a rigid-flexible composite self-adjusting wind turbine blade. Background Technology

[0002] Wind turbines can be classified into two types based on the orientation of their rotating shaft: horizontal axis and vertical axis.

[0003] Although the blades of horizontal axis wind turbines cover a large area, their wind-receiving area is relatively small, resulting in low wind energy utilization. Furthermore, they are expensive, complex to install, and extremely inconvenient to maintain.

[0004] Vertical axis wind turbines do not require a directional tail fin to adjust the windward angle, are easy to install and cost-effective, and are highly applicable in micro-scale distributed wind power generation scenarios. They can effectively meet diverse distributed power demand and have therefore attracted widespread attention.

[0005] To improve the efficiency of vertical axis wind turbines, it is necessary to increase the wind-receiving surface area of ​​drag-type blades while reducing their wind-blocking surface area. Existing drag-type blades are mainly of two types: S-shaped and cup-shaped. Both types of blades are rigid and have a fixed shape. Although they have a large wind-receiving surface area, their wind-blocking surface area is also large. This means that while the wind turbine obtains greater thrust, it also experiences greater drag, resulting in limited power generation efficiency. Summary of the Invention

[0006] In order to overcome the shortcomings of the existing technology, the present invention aims to provide a rigid-flexible composite self-adjusting wind turbine blade, which has the characteristics of unidirectional airflow conduction, thereby releasing air resistance.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A rigid-flexible composite self-adjusting wind turbine blade includes rigid-flexible composite blades, which are equally spaced on a rotating shaft, and the bottom of the rotating shaft is connected to a generator. Rigid-flexible composite blades are spaced at equal intervals; The rigid-flexible composite blade has an arc-shaped main body. It includes rigid blades and flexible blades. The rigid blades have two sides, one concave and one convex. The flexible blades are installed on the concave side of the rigid blades and the two sides face each other. The rigid blades have several ventilation holes one and the flexible blades have several ventilation holes two. Each ventilation hole one and each ventilation hole two are complementary. The convex surface of the rigid blade is the wind-blocking surface, while the flexible blade serves as the wind-receiving surface, capable of deforming and returning to its original position under wind force.

[0008] The rigid-flexible composite blade includes a rigid blade, a flexible blade, a fixing pad, a fixing bracket, and a limiting rod. The main body of the rigid blade is arc-shaped with concave and convex surfaces. The fixing pad presses the flexible blade onto the concave surface of the rigid blade to form the main body of the rigid-flexible composite blade. When there is no wind and the blade is not in operation, the rigid blade and the flexible blade are in close contact with each other. The arc of the rigid-flexible composite blade is between 120° and 160°, which allows the concave surface to receive wind while ensuring that the flexible blade unfolds due to air resistance from the convex surface. The fixed bracket is installed and connected to the rigid blade via a limiting rod.

[0009] The main body of the rigid blade is an arc-shaped plate, which is divided into a concave surface and a convex surface. The two ends of the arc-shaped plate are rectangular folded edges with mounting holes four. Six ventilation holes one are evenly distributed on the surface of the arc-shaped plate. The six ventilation holes one are arranged in three rows and two columns. The total area of ​​the six ventilation holes one accounts for two-fifths of the area of ​​the entire arc-shaped plate. Flexible blade mounting holes one are provided on both sides of the arc-shaped plate near the folded edges.

[0010] The rigid blades are made of alloys or composite materials, such as aluminum alloys or glass fiber reinforced polymer (GFRP), and are formed by stamping or vacuum injection molding, with a thickness between 1 mm and 2 mm.

[0011] The flexible blade body is a rectangular membrane with four ventilation holes in two rows and two columns. It has two mounting holes on both sides that are the same as the mounting holes on the rigid blade. The flexible blade is clamped to the rigid blade by rectangular fixing pads with holes and connected by bolts, forming a fixed beam structure. The diameter of the ventilation holes is the same as the diameter of the ventilation holes. The length of the flexible blade is the same as the arc length of the arc plate of the rigid blade.

[0012] The flexible blades are organic membranes with a thickness of 1 mm to 2 mm. They are characterized by high temperature resistance, corrosion resistance, and good elasticity or flexibility, such as perfluoroether rubber (FFKM), polytetrafluoroethylene (PTFE), and polyurethane (TPU). They can deform and return to their original shape under wind force.

[0013] Both the rigid and flexible blades have smooth surfaces. When not subjected to external excitation, the flexible blade fits tightly against the inner side of the rigid arc-shaped blade. The two vents, ventilator 1 and ventilator 2, are complementary, and their edges are tangent. When subjected to air resistance, the flexible blade separates from the rigid blade, and the ventilator 1 and ventilator 2 are misaligned to form a certain overlapping area, serving as a channel for releasing air resistance. Mounting hole 1 and mounting hole 2 are aligned, and the rigid-flexible composite blade is seamless when not subjected to external excitation.

[0014] The fixed bracket includes a mounting vertical beam and multiple evenly distributed mounting rods perpendicular to the mounting vertical beam. The mounting vertical beam has mounting hole three, which is corresponding to mounting hole four, and is used to install and connect the fixed bracket to the rigid blade through the limiting rod.

[0015] The mounting rod is connected to the slot or mounting hole on the rotating shaft, specifically by means of snap-fit ​​or welding.

[0016] The limiting rod is a metal double-threaded rod that passes through the two ends of the rigid blade and the mounting holes on the fixed bracket and is fastened with nuts to install the rigid blade and the fixed bracket together. While reinforcing the rigid-flexible composite blade, it also serves to limit the movement of the flexible blade. There are multiple limiting rods for one rigid-flexible composite blade.

[0017] The rotating shaft is a metal stepped shaft with slots or mounting holes. The slots or mounting holes are used to install rigid-flexible composite blades, and the shaft shoulder is used to limit and fix various bearings. The generator is a direct-drive type or a disc type and is installed at the bottom of the rotating shaft.

[0018] Four sets of rigid-flexible composite blades are set at equal intervals.

[0019] A method for using a rigid-flexible composite self-adjusting wind turbine blade includes the following steps; When there is no wind and the generator is not working, the flexible blades in the rigid-flexible composite blades do not bend or deform, the rigid and flexible blades as a whole maintain geometric symmetry, the shaft does not rotate, and the generator does not work. When subjected to wind, the flexible blades in the rigid-flexible composite blades at different positions deform differently, and the rigid-flexible composite blades have the ability to conduct airflow in one direction. When the windward side of the rigid-flexible composite blade is the windward side and is directly opposite the direction of the incoming flow (azimuth 1), the flexible blade experiences the greatest wind pressure. It fits tightly with the rigid blade without gaps, and the wind pressure generates a large thrust on the windward side, driving the shaft to rotate. When the rigid-flexible composite blade tends to be parallel to the direction of the incoming flow (position two), due to the relative motion between it and the air, the flexible blade is subjected to the airflow resistance transmitted through the air vent one of the rigid blade and gradually separates from the rigid blade. The air vent one and air vent two of the two are misaligned. Part of the airflow resistance is released through the gap created by the misalignment, and the remaining resistance causes the flexible blade to deform and is transformed into the internal stress of the flexible blade. As the rigid-flexible composite blades continue to rotate, the wind-blocking surface gradually transforms into the windward surface. When it is in the position directly opposite to the direction of the incoming flow (position three), the airflow resistance is applied to the flexible blade through the air vent one of the rigid blade, so that the deformation of the flexible blade reaches its maximum and it is in close contact with the limiting rod. The gap between the rigid blade and the flexible blade reaches its maximum, and the released resistance reaches its maximum value. When the rigid-flexible composite blade moves to a position parallel to the incoming flow (position four), it is only subject to resistance generated by the relative motion with the air. The deformation of the flexible blade decreases, and the released resistance value gradually decreases. This position is the critical position where the windward surface and the wind-resistant surface alternate to become the windward surface. After this, the windward surface gradually becomes the windward surface, and the flexible blade gradually comes into contact with the rigid blade under the action of wind pressure. The gap between them disappears, and the rigid-flexible composite blade gradually returns to the initial position (position one). When the rigid-flexible composite blade is positioned directly opposite the direction of the incoming flow, the wind pressure is at its maximum, the flexible blade and the rigid blade are in the closest contact, and the wind pressure on the windward surface generates a strong thrust, which drives the shaft to rotate. This cycle repeats, driving the generator to produce electricity. The rotation period of the shaft is consistent with the period of contact and separation between the flexible blade and the rigid blade.

[0020] When the flexible blade is in full contact with the limiting rod, the flexible blade portion between any two limiting rods constitutes a fixed beam unit. Under a relative air resistance wind speed of 5 m / s, the deflection of each fixed beam unit should not exceed 5 mm, ensuring that the deformation of the flexible blade is within the safe threshold.

[0021] The beneficial effects of this invention are: In this invention, the flexible blades adaptively deform and form a misaligned gap with the air vents of the rigid blades, releasing some of the airflow resistance on the wind-blocking surface. The rigid-flexible composite blades have unidirectional airflow conduction capability. Compared with traditional rigid blades, the rigid-flexible composite blades can significantly reduce the resistance of the wind-blocking surface without sacrificing the thrust of the wind-receiving surface, thereby lowering the starting wind speed of the wind turbine and improving the wind energy harvesting efficiency of the wind turbine.

[0022] The blades can adaptively adjust according to their orientation relative to the airflow, exhibiting strong environmental adaptability; they have a simple structure and are easy to install; they have a low starting wind speed and high wind energy collection efficiency; they have strong speed adaptability, stable performance, high reliability, and strong designability.

[0023] In this invention, the flexible blade has a fixed beam structure, and when its elasticity is good, its deflection is large. To ensure that the flexible blade is not torn or damaged, the number of limiting rods and their distance from the flexible blade should be designed and checked to ensure that the deformation of the flexible blade is within a safe threshold. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a rigid-flexible composite self-regulating wind turbine system in a preferred embodiment of the present invention.

[0025] Figure 2 yes Figure 1 Schematic diagram of the medium-rigid-flexible composite blade b.

[0026] Figure 3 yes Figure 2A schematic diagram of the medium-rigid blade b1.

[0027] Figure 4 yes Figure 2 A schematic diagram of the medium-flexible blade b2.

[0028] Figure 5 yes Figure 2 A schematic diagram of the fixing pad b3, the fixing bracket b4, and the limiting rod b5.

[0029] Figure 6 yes Figure 2 A schematic diagram showing the separation of the rigid blade b1 from the flexible blade b2.

[0030] Figure 7 This is a diagram showing the motion process of the rigid-flexible composite self-adjusting blade b in this invention. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings.

[0032] like Figures 1-6 As shown, the present invention proposes a rigid-flexible composite self-adjusting wind turbine blade, including a rigid-flexible composite blade b, which is installed at equal intervals on a rotating shaft a, and the bottom of the rotating shaft a is connected to a generator c. Four groups of rigid-flexible composite blades are set at equal intervals.

[0033] The rigid-flexible composite blade b includes a rigid blade b1, a flexible blade b2, a fixing pad b3, a fixing bracket b4, and a limiting rod b5. The fixing pad b3 is used to press the two ends of the flexible blade b2 onto the concave sides of the rigid blade b1, forming the main body of the rigid-flexible composite blade b. The length of the flexible blade b2 is consistent with the arc length of the arc plate b11 of the rigid blade b1. When there is no wind and the blade is not working, the rigid blade b1 and the flexible blade b2 are in close contact with each other, and the main body of the rigid-flexible composite blade b is arc-shaped, divided into a concave surface and a convex surface. The arc of the rigid-flexible composite blade b is between 120° and 160°, so that the concave surface can receive wind while ensuring that the flexible blade b2 can unfold due to the air resistance of the convex surface.

[0034] The main body of the rigid blade b1 is an arc-shaped plate b11, which is divided into a concave surface and a convex surface. The two ends of the arc-shaped plate b11 are rectangular folded edges b12 with mounting holes four b14. Six ventilation holes one b13 are evenly distributed on the surface of the arc-shaped plate b11. The six ventilation holes one b13 are arranged in three rows and two columns. The total area of ​​the six ventilation holes one b13 accounts for two-fifths of the area of ​​the entire arc-shaped plate b11. Flexible blade b2 mounting holes one b15 are provided on both sides of the arc-shaped plate b11 near the folded edges b12.

[0035] The rigid blade b1 is made of alloy or composite material, such as aluminum alloy or glass fiber reinforced polymer (GFRP), and is formed by stamping or vacuum injection molding, with a thickness between 1 mm and 2 mm.

[0036] The main body of the flexible blade b2 is a rectangular membrane b21 with four ventilation holes b22 evenly distributed in two rows and two columns. On both sides, there are two mounting holes b23 that are the same as the mounting holes b15 on the rigid blade. The flexible blade b2 is pressed onto the rigid blade b1 by a rectangular fixing pad with holes b3 and connected by bolts, which has the characteristics of a fixed beam structure. The diameter of the ventilation holes b22 is the same as the diameter of the ventilation holes b13.

[0037] The flexible blade b2 is an organic membrane with a thickness of 1 mm to 2 mm. It has the characteristics of high temperature resistance, corrosion resistance, and good elasticity or flexibility, such as perfluoroether rubber (FFKM), polytetrafluoroethylene (PTFE), polyurethane (TPU), etc., and can deform and return to its original position under the action of wind.

[0038] Both the rigid blade b1 and the flexible blade b2 have smooth surfaces. When not subjected to external excitation, the flexible blade b2 fits tightly against the inner side of the rigid curved plate blade b1, with their ventilation holes b13 and b22 being complementary and tangent at their edges. When subjected to air resistance, the flexible blade b2 separates from the rigid blade b1, and the ventilation holes b13 and b22 overlap, forming a channel for releasing air resistance. Mounting holes b15 and b23 are aligned, resulting in a seamless rigid-flexible composite blade b when not subjected to external excitation.

[0039] The fixed bracket b4 includes a mounting vertical beam b41 and multiple evenly distributed mounting rods b42 perpendicular to the mounting vertical beam b41. The mounting vertical beam b41 has mounting holes three b43, which are correspondingly arranged with mounting holes four b14, and are used to install and connect the fixed bracket b4 to the rigid blade b1 through the limiting rod b5.

[0040] The mounting rod b42 is connected to the slot or mounting hole on the rotating shaft a, specifically by means of snap-fit ​​or welding.

[0041] The limiting rod b5 is a double-threaded metal rod that passes through the two ends of the rigid blade b1 (folded edges b12) and the mounting holes b43 on the fixed bracket b4, and is secured with nuts. This secures the rigid blade b1 to the fixed bracket b4, reinforcing the rigid-flexible composite blade b while also limiting the movement of the flexible blade b2. Multiple limiting rods b5 exist for each rigid-flexible composite blade b. The specific number is determined by the design based on the modal characteristics and maximum deformation of the flexible blade b2. When the flexible blade b2 is in complete contact with the limiting rod b5, the portion of the flexible blade b2 between any two limiting rods b5 constitutes a fixed beam unit. At this point, the system has multiple fixed beam units, and each fixed beam unit exhibits a deflection of no more than 5 mm under a relative air resistance wind speed of 5 m / s.

[0042] The rigid-flexible composite blade b has two surfaces, concave and convex. The concave surface is the wind-receiving surface, and the convex surface is the wind-blocking surface.

[0043] The rotating shaft a is a metal stepped shaft with a slot or mounting hole. The slot or mounting hole is used to install the rigid-flexible composite blade b, and the shaft shoulder is used to limit and fix various bearings. The generator c is a direct drive type or a disc type and is installed at the bottom of the rotating shaft a.

[0044] like Figure 7 As shown, the present invention proposes a method for using a rigid-flexible composite self-adjusting wind turbine blade, which includes the following steps; When there is no wind and the machine is not working, the flexible blade b2 in the rigid-flexible composite blade b does not bend or deform, the rigid blade b1 and the flexible blade b2 as a whole maintain geometric symmetry, the shaft a does not rotate, and the generator c does not work. When subjected to wind force, the deformation of the flexible blade b2 in the rigid-flexible composite blade b at different positions is different, and the rigid-flexible composite blade b has the ability to conduct airflow in one direction. Taking the rotation of shaft a one revolution and blade b in four typical positions as an example, when the windward surface of the rigid-flexible composite blade b is the windward surface and is directly opposite the direction of the incoming flow (position one), the flexible blade b2 experiences the greatest wind pressure and is tightly fitted with the rigid blade b1 without gaps. The wind pressure generates a large thrust on the windward surface, driving shaft a to rotate. When the rigid-flexible composite blade b tends to be parallel to the direction of the incoming flow (position two), due to its relative motion with the air, the flexible blade b2 is subjected to airflow resistance transmitted through the first vent b13 of the rigid blade b1 and gradually separates from the rigid blade b1. The first vent b13 and the second vent b22 of the two are misaligned. Some of the airflow resistance is released through the gap created by the misalignment, and the remaining resistance causes the flexible blade b2 to deform, which is converted into internal stress in the flexible blade b2. As the rigid-flexible composite blade b continues to rotate, the wind resistance... As the flexible blade b1 gradually transforms into the windward side and is positioned directly opposite the direction of the incoming flow (position three), the airflow resistance is applied to the flexible blade b2 through the air vent b13 of the rigid blade b1, causing the deformation of the flexible blade b2 to reach its maximum and making it in close contact with the limiting rod b5. The gap between the rigid blade b1 and the flexible blade b2 reaches its maximum, and the released resistance reaches its maximum value. When the rigid-flexible composite blade b1 moves to a position parallel to the direction of the incoming flow (position four), it is only subject to the resistance generated by the relative motion with the air. The deformation of the flexible blade b2 decreases, and the released resistance value gradually decreases. This position is the critical position where the windward side and the wind-resistant side alternate to become the windward side. After this, the windward side gradually transforms into the windward side, and the flexible blade b2, under the action of wind pressure, gradually comes into contact with the rigid blade b1, and the gap between them disappears. The rigid-flexible composite blade b1 gradually returns to its initial position (position one). When the rigid-flexible composite blade b is positioned directly opposite the direction of the incoming flow, the wind pressure is at its maximum. The flexible blade b2 and the rigid blade b1 are in the closest contact. The wind pressure on the windward surface generates a strong thrust, which drives the rotating shaft a to rotate. This cycle repeats, driving the generator c to generate electricity. The rotation period of the rotating shaft a is consistent with the contact and separation period of the flexible blade b2 and the rigid blade b1.

[0045] In this invention, the flexible blade b2 has a fixed beam structure, and when its elasticity is good, its deflection is large. To ensure that the flexible blade b2 is not torn or damaged, the number of limiting rods b5 and their spacing with the flexible blade b2 should be designed and checked. When the flexible blade b2 is in complete contact with the limiting rods b5, the portion of the flexible blade b2 between any two limiting rods b5 constitutes a fixed beam unit. Under a relative air resistance wind speed of 5 m / s, the deflection of each fixed beam unit should not exceed 5 mm, ensuring that the deformation of the flexible blade b2 is within the safe threshold.

[0046] In this invention, the flexible blade b2 adaptively deforms and forms a misaligned gap with the air vent b13 of the rigid blade b1, thereby releasing part of the airflow resistance on the wind-blocking surface. The rigid-flexible composite blade b has unidirectional airflow conduction capability. Compared with traditional rigid blades, the rigid-flexible composite blade b can significantly reduce the resistance of the wind-blocking surface without sacrificing the thrust of the wind-receiving surface, thereby reducing the starting wind speed of the wind turbine and improving the wind energy harvesting efficiency of the wind turbine.

[0047] The blades of this invention can adaptively adjust according to their orientation relative to the airflow, exhibiting strong environmental adaptability; they have a simple structure and are easy to install; they have low starting wind speed and high wind energy collection efficiency; they have strong speed adaptability, stable performance, high reliability, and strong designability.

Claims

1. A rigid-flexible composite self-adjusting wind turbine blade, characterized in that, The rigid-flexible composite blade (b) is equidistantly arranged on the rotating shaft (a), and the bottom of the rotating shaft (a) is connected with the generator (c); The rigid-flexible composite blade (b) is equidistantly arranged; The rigid-flexible composite blade (b) is equidistantly arranged on the rotating shaft (a), and the bottom of the rotating shaft (a) is connected with the generator (c); The convex surface of the rigid blade (b1) is a wind resistance surface, and the flexible blade (b2) is a wind receiving surface, which can be deformed and reset under the action of wind.

2. A rigid-flexible composite self-adjusting wind turbine blade according to claim 1, characterized in that, The rigid-flexible composite blade (b) includes a rigid blade (b1), a flexible blade (b2), a fixed gasket (b3), a fixed support (b4), and a limiting rod (b5); the rigid blade (b1) is arc-shaped and has concave and convex surfaces, the flexible blade (b2) is pressed on the concave surface of the rigid blade (b1) by the fixed gasket (b3), and the rigid-flexible composite blade (b) is formed; when there is no wind, the rigid blade (b1) and the flexible blade (b2) are attached to each other, the rigid-flexible composite blade (b) has an arc of 120° to 160°, the concave surface receives wind, and the flexible blade (b2) is expanded under the air resistance of the convex surface; The fixed support (b4) is connected with the rigid blade (b1) through the limiting rod (b5).

3. A rigid-flexible composite self-adjusting wind turbine blade according to claim 2, characterized in that, The main body of the rigid blade (b1) is an arc-shaped plate (b11), which has a concave surface and a convex surface, and the two ends of the arc-shaped plate (b11) are rectangular folded edges (b12) provided with mounting holes four (b14); the arc-shaped plate (b11) is uniformly provided with six air holes one (b13), the six air holes one (b13) are arranged in three rows and two columns, the total area of the six air holes one (b13) accounts for two-fifths of the area of the entire arc-shaped plate (b11), and the two sides of the arc-shaped plate (b11) close to the folded edges (b12) are provided with flexible blade (b2) mounting holes one (b15); The rigid blade (b1) is made of alloy or composite material and is formed by stamping or vacuum infusion, and has a thickness of 1 mm to 2 mm.

4. A rigid-flexible composite self-adjusting wind turbine blade according to claim 3, characterized in that, The main body of the flexible blade (b2) is a rectangular film (b21) uniformly provided with four air holes two (b22) arranged in two rows and two columns, and the two sides are provided with mounting holes two (b23) consistent with the mounting holes one (b15) on the rigid blade; the flexible blade (b2) is clamped and pressed on the rigid blade (b1) by the rectangular fixed gasket (b3) with holes and is connected by bolts, has a fixed beam structure feature, the air holes two (b22) have the same diameter as the air holes one (b13); the length of the flexible blade (b2) is consistent with the arc length of the arc-shaped plate (b11) of the rigid blade (b1). The flexible blade (b2) is an organic film, has a thickness of 1 mm to 2 mm, and can be deformed and reset under the action of wind.

5. A rigid-flexible composite self-adjusting wind turbine blade according to claim 4, wherein, The surface of the rigid blade (b1) and the flexible blade (b2) is smooth, and the flexible blade (b2) is tightly attached to the inner side of the rigid arc-shaped plate blade (b1) without external excitation, the air hole one (b13) and the air hole two (b22) are complementary, and the hole edges of the air hole one (b13) and the air hole two (b22) are tangent; when affected by air resistance, the flexible blade (b2) is separated from the rigid blade (b1), the air hole one (b13) and the air hole two (b22) are misaligned to form a certain overlapping area, which is used as an air resistance release channel; the mounting hole one (b15) is aligned with the mounting hole two (b23), and the rigid-flexible composite blade (b) is seamless as a whole without external excitation.

6. A rigid-flexible composite self-adjusting wind turbine blade according to claim 5, wherein, The fixed support (b4) comprises a mounting vertical beam (b41) and a plurality of mounting rods (b42) uniformly distributed and perpendicular to the mounting vertical beam (b41), the mounting vertical beam (b41) is provided with a mounting hole three (b43), and the mounting hole three (b43) is correspondingly arranged with the mounting hole four (b14) for mounting and connecting the fixed support (b4) with the rigid blade (b1) through the limiting rod (b5); The mounting rod (b42) is connected with the clamping groove or the mounting hole on the rotating shaft (a).

7. A rigid-flexible composite self-adjusting wind turbine blade according to claim 6, characterized in that, The limiting rod (b5) is a metal double-thread rod, which transversely passes through the two end flanges (b12) of the rigid blade (b1) and the mounting hole three (b43) on the fixed support (b4) and is fastened with a nut to mount the rigid blade (b1) and the fixed support (b4) together, and one rigid-flexible composite blade (b) has a plurality of limiting rods (b5).

8. A rigid-flexible composite self-adjusting wind turbine blade according to claim 7, characterized in that, The rotating shaft (a) is a metal stepped shaft with a clamping groove or a mounting hole, the clamping groove or the mounting hole is used for mounting the rigid-flexible composite blade (b), and the shaft shoulder is used for limiting and fixing various bearings; the generator (c) is directly driven or disc type and is installed at the bottom of the rotating shaft (a); The rigid-flexible composite blades (b) are arranged at equal intervals.

9. A method of using the rigid-flexible composite self-adjusting wind turbine blade according to any one of claims 1-8, characterized in that, The method comprises the following steps: In the case of no wind, the flexible blade (b2) in the rigid-flexible composite blade (b) does not bend and deform, the rigid blade (b1) and the flexible blade (b2) as a whole remain geometrically symmetrical, the rotating shaft (a) does not rotate, and the generator (c) does not work; When affected by wind, the deformations of the flexible blades (b2) in the rigid-flexible composite blades (b) at different positions are different, and the rigid-flexible composite blade (b) has the ability of one-way conduction to air flow; When the wind-affected surface of the rigid-flexible composite blade (b) is the windward surface and is in a right position with the flow direction, the flexible blade (b2) is tightly attached to the rigid blade (b1) without gap, the wind pressure on the wind-affected surface forms a larger thrust, which drives the rotating shaft (a) to rotate; When the rigid-flexible composite blade (b) tends to the parallel orientation of the flow direction, the flexible blade (b2) is gradually separated from the rigid blade (b1) by the air resistance transmitted through the air hole one (b13) of the rigid blade (b1), and the air hole one (b13) and the air hole two (b22) are misaligned, part of the air resistance is released through the gap generated by the misalignment, and the remaining part of the resistance makes the flexible blade (b2) deform and convert into the internal stress of the flexible blade (b2); With the continuous rotation of the rigid-flexible composite blade (b), the wind resistance surface gradually changes to the windward surface, and when it is in the orientation perpendicular to the flow direction, the air resistance is applied to the flexible blade (b2) through the air hole one (b13) of the rigid blade (b1), so that the deformation amount of the flexible blade (b2) reaches the maximum and is in close contact with the limiting rod (b5), and the gap between the rigid blade (b1) and the flexible blade (b2) reaches the maximum, and the released resistance reaches the maximum value; When the rigid-flexible composite blade (b) moves to the parallel orientation of the flow direction again, the deformation amount of the flexible blade (b2) decreases, and the released resistance value gradually decreases, and this orientation is the critical position where the wind resistance surface and the wind resistance surface alternately become the windward surface; thereafter, the wind resistance surface gradually changes to the windward surface, and the flexible blade (b2) is gradually attached to the rigid blade (b1) under the action of wind pressure, and the gap disappears, and the rigid-flexible composite blade (b) gradually returns to the initial orientation; When the rigid-flexible composite blade (b) is in the orientation one perpendicular to the flow direction, the wind pressure is the largest, and the flexible blade (b2) is attached to the rigid blade (b1) most closely, the wind pressure on the wind resistance surface forms a strong thrust, which pushes the rotating shaft (a) to rotate, and the cycle is repeated, which drives the generator (c) to generate electric energy, and the rotating period of the rotating shaft (a) and the attachment and separation period of the flexible blade (b2) and the rigid blade (b1) are consistent.

10. A method of using a rigid-flexible composite self-adjusting wind turbine blade according to claim 9, wherein, When the flexible blade (b2) is in complete contact with the limiting rod (b5), the part of the flexible blade (b2) between any two limiting rods (b5) constitutes a clamped beam element, and the deflection of each clamped beam element should not exceed 5mm under the relative air resistance wind speed of 5m / s, so as to ensure that the deformation amount of the flexible blade (b2) is within the safety threshold.

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