Self-adaptive load reduction wind power blade assembly and wind generating set

Abstract

The invention discloses a self-adaptive load reduction wind power blade assembly and a wind generating set, and relates to the technical field of wind power generation, the self-adaptive load reduction wind power blade assembly comprises a blade body, a first barrel, a second barrel, a third barrel, a spiral blade plate, an elastic swing piece, a cover plate assembly and an elastic reset piece; the first barrel is arranged in the blade body, and the rear end is communicated with the rear edge exhaust port; the second barrel is coaxially fixed in an inner cavity of the first barrel to form a first load reduction channel, and a spiral blade plate is arranged in the channel; the third cylinder is coaxially fixed in an inner cavity of the second cylinder to form a second load reduction channel and a third load reduction channel, and an elastic swing piece is arranged in the second load reduction channel; one end of the elastic reset piece is connected with the blade body, the other end of the elastic reset piece is connected with the first barrel, and the first barrel is pushed to abut against the inner side of the cover plate; the cover plate assembly can overcome the elastic acting force to be opened under the wind power effect, the three load reduction channels are sequentially communicated with the air inlet to achieve graded load reduction, and the power generation efficiency and the blade structure safety can be both considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power generation, in particular to a self-adaptive load-reducing wind power blade assembly and a wind turbine generator system. BACKGROUND

[0002] In the field of wind power generation, wind power blades, as the core components of wind turbines, have a crucial influence on power generation efficiency and equipment life. In the Gobi and other areas with large amounts of wind and harsh environments, large-scale wind turbine generators are increasingly used. Although these areas have abundant wind energy resources, extreme wind conditions with high wind speed often occur, posing a serious challenge to the normal operation of wind power blades. Under extreme wind conditions, the load borne by the wind power blades increases significantly, which may cause the wind power blades to rotate too fast; and when the load borne by the wind power blades exceeds the structural strength limit of the wind power blades, problems such as distortion, deformation, and even breakage may occur, posing a great safety hazard.

[0003] To solve the above problems, existing wind power generation equipment begins to try to set a shunt air duct on the wind power blade, so that part of the airflow directly passes through the wind power blade through the shunt air duct, thereby reducing the total airflow shunted to the suction surface and the pressure surface of the wind power blade, so as to quickly reduce the lift of the wind power blade and achieve the effect of load reduction, avoiding overloading operation of the wind power blade under extreme wind conditions and causing structural damage. However, the shunt scheme of the above wind power blade cannot timely adapt to the wind power situation when responding to actual wind power changes, and has a problem of response lag; this lag either causes excessive airflow to escape and weaken the blade lift when the wind power does not reach an extreme level, resulting in a decrease in power generation efficiency; or causes the load reduction measure to fail to adapt in time when the wind power rises to an extreme level, making it difficult to fully dissipate airflow kinetic energy, so that the wind power blade cannot effectively avoid the risk of structural damage due to overload.

[0004] Based on the above problems, there is an urgent need for a wind power blade system that can realize adaptive adjustment of opening according to real-time wind power conditions, so as to achieve a good balance between power generation efficiency and structural safety. SUMMARY

[0005] The main purpose of the present application is to provide a self-adaptive load-reducing wind power blade assembly, which aims to solve the technical problem in the prior art that there is a lack of a wind power blade system that can realize adaptive adjustment of opening according to real-time wind power conditions, so as to be difficult to achieve a good balance between power generation efficiency and structural safety.

[0006] To achieve the above purpose, the self-adaptive load-reducing wind power blade assembly provided by the present application comprises: A blade body has a suction surface and a pressure surface arranged oppositely along a thickness direction, and has a leading edge and a trailing edge arranged oppositely along a width direction; the leading edge is provided with an air inlet, and the trailing edge is provided with an air outlet; A first cylinder is arranged inside the blade body; a rear end of the first cylinder is communicated with the air outlet; A second cylinder is coaxially fixed in an inner cavity of the first cylinder; a first load reduction channel is formed between the first cylinder and the second cylinder; A third cylinder is coaxially fixed in an inner cavity of the second cylinder; a second load reduction channel is formed between the second cylinder and the third cylinder, and an inner cavity of the third cylinder forms a third load reduction channel; A spiral vane extends spirally along a front-rear direction in the first load reduction channel; A plurality of elastic swing plates are distributed in the second load reduction channel at intervals; A cover plate assembly is hinged to the leading edge in a double-door structure to cover the air inlet; An elastic return member is connected to the blade body at one end and connected to the first cylinder at the other end; the elastic return member applies an elastic forward force to the first cylinder to push a front end of the first cylinder against an inner side of the cover plate assembly; The cover plate assembly is used to overcome the elastic force of the elastic return member and open inwardly under the impact of external airflow; the opening amplitude of the cover plate assembly is proportional to the flow rate of external airflow; as the opening amplitude gradually increases, the third load reduction channel, the second load reduction channel and the first load reduction channel are sequentially communicated with the air inlet.

[0007] In an embodiment, the suction surface is provided with a plurality of arrayed turbulence orifices, and the air outlet direction of the turbulence orifices is perpendicular to the suction surface; The adaptive load reduction wind power blade assembly further comprises a gas supply device, a gas storage tank of the gas supply device is communicated with at least one of the first cylinder, the second cylinder and the third cylinder; the gas supply device is used to supply gas to the turbulence orifices to reduce the gas flow rate of the suction surface through the airflow ejected outwardly by the turbulence orifices, thereby reducing the lift of the blade body.

[0008] In an embodiment, the turbulence orifices are communicated with the outer peripheral side of the first load reduction channel.

[0009] In an embodiment, the adaptive load reduction wind power blade assembly further comprises a limiting stopper arranged inside the blade body; When the first barrel is pushed by the inwardly opening cover assembly to move rearward to a critical position, the limiting block is used to abut against the first barrel to prevent the first barrel from continuing to move rearward.

[0010] In an embodiment, the adaptive load-reducing wind power blade assembly further comprises a flexible buffer layer arranged on the inner side of the cover assembly, and the flexible buffer layer is used to fit the front end of the first barrel.

[0011] In an embodiment, the spiral vane is provided with a plurality of flow-through holes, and the flow-through holes are in communication with the first load-reducing channel.

[0012] In an embodiment, the barrel wall of the second barrel is provided with a plurality of dispersion holes, and the dispersion holes are in communication with the first load-reducing channel and the second load-reducing channel.

[0013] In an embodiment, the adaptive load-reducing wind power blade assembly further comprises a semiconductor thermoelectric power generation sheet attached to the barrel wall of the first barrel, the barrel wall of the second barrel, and the barrel wall of the third barrel, and the semiconductor thermoelectric power generation sheet is used to convert the internal energy generated by the airflow in the first load-reducing channel, the second load-reducing channel, and the third load-reducing channel into electrical energy.

[0014] In an embodiment, a plurality of the elastic pendulums are uniformly arranged along the circumference of the second barrel.

[0015] In an embodiment, the elastic pendulum is arranged in a hollow structure.

[0016] In an embodiment, the surface of the elastic pendulum is provided with a plurality of convex rib structures and groove structures arranged at intervals, and the convex rib structures and the groove structures are in a wavy shape.

[0017] In an embodiment, at least one of the elastic pendulums is embedded with a counterweight.

[0018] The present application also provides a wind turbine generator set comprising the adaptive load-reducing wind power blade assembly as described above.

[0019] The adaptive load reduction wind power blade assembly provided by the application realizes adaptive hierarchical load reduction based on wind speed changes through the cooperative design of the first load reduction channel, the second load reduction channel and the third load reduction channel coaxially nested in the blade body, the front edge cover plate assembly and the elastic reset member; under conventional power generation wind conditions, the cover plate assembly remains closed under the action of the elastic reset member, which can ensure the stable lift of the surface of the blade body and guarantee the rated power generation efficiency of the unit; when the wind speed rises to the first preset threshold, the cover plate assembly is slightly opened, the third load reduction channel is communicated with the air inlet, a small amount of airflow flowing to the suction surface and the pressure surface can be reduced through the basic flow splitting effect, light load reduction is realized, and excessive loss of power generation is preferentially avoided; when the wind speed further rises to the second preset threshold, the opening of the cover plate assembly continues to expand, the third load reduction channel and the second load reduction channel are communicated with the air inlet, the flow splitting effect can be enhanced through the expansion of the effective flow passage, the airflow kinetic energy is dissipated with the help of the elastic flap, the overall airflow is inhibited by the pressure rise at the trailing edge, and moderate load reduction is realized under the dual action of balancing structural safety and power generation efficiency; when the wind speed reaches the third preset threshold of extreme wind conditions, the cover plate assembly is completely opened and the third load reduction channel, the second load reduction channel and the first load reduction channel are communicated with the air inlet, the spiral vanes will guide the airflow to spiral motion, high-intensity kinetic energy dissipation is realized through violent friction and collision, the maximum flow splitting effect of the three load reduction channels and the local high pressure at the trailing edge are superimposed, the airflow flowing to the suction surface and the pressure surface can be reduced to the maximum extent, and heavy load reduction is realized, which can effectively avoid the risk of structural damage of the wind power blade. The scheme does not need external driving, and only relies on airflow impact and elastic reset member to complete automatic response and reset, can accurately match the load reduction demand under different wind conditions, so that the blade body obtains corresponding light load reduction effect, moderate load reduction effect or heavy load reduction effect, so that the hierarchical adaptive adjustment of the load reduction effect of the wind power blade is realized, the load can be fully reduced under large wind force, and the lift can be maintained under small wind force, so that a good balance between unit power generation efficiency and structural safety of the wind power blade can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0021] Figure 1 The structure schematic view of the cover plate assembly in the adaptive load reduction wind power blade assembly provided by the present application in the closed state; Figure 2 The structure schematic view of the cover plate assembly in the adaptive load reduction wind power blade assembly provided by the present application in the closed state; Figure 1 The enlarged schematic view of position A in the adaptive load reduction wind power blade assembly provided by the present application; Figure 3This is a schematic diagram of the structure of the cover plate assembly in the adaptive load-reducing wind turbine blade assembly provided by the present invention when it is in the first open state (the air inlet is connected to the third load-reducing channel). Figure 4 for Figure 3 Enlarged view of point B in the middle; Figure 5 This is a schematic diagram of the structure of the cover plate assembly in the adaptive load-reducing wind turbine blade assembly provided by the present invention when it is in the second open state (the air inlet is connected to the third load-reducing channel and the second load-reducing channel). Figure 6 for Figure 5 Enlarged view of point C in the middle; Figure 7 This is a schematic diagram of the structure of the cover plate assembly in the adaptive load-reducing wind turbine blade assembly provided by the present invention when it is in the third open state (the air inlet is connected to the third load-reducing channel, the second load-reducing channel, and the first load-reducing channel). Figure 8 for Figure 7 Enlarged diagram of point D in the middle.

[0022] Explanation of icon numbers: 1. Blade body; 101. Suction surface; 102. Pressure surface; 103. Leading edge; 104. Trailing edge; 1011. Turbulence vent; 1031. Inlet; 1041. Exhaust port; 2. First cylinder; 201. First unloading channel; 3. Second cylinder; 301. Second unloading channel; 302. Dispersion vent; 4. Third cylinder; 401. Third unloading channel; 5. Spiral blade plate; 501. Flow passage; 6. Elastic swing plate; 7. Cover plate assembly; 8. Elastic reset component; 9. Air supply device; 10. Limiting block; 11. Flexible buffer layer; 12. Semiconductor thermoelectric generator.

[0023] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, motion condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0026] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0027] In the field of wind power generation, wind power blades, as the core components of wind power generators, have a crucial influence on power generation efficiency and equipment life. In the Gobi and other areas with large amounts of sand and harsh environments, large-scale wind power generators are increasingly used. Although these areas have abundant wind energy resources, extreme wind conditions with extremely high wind speeds often occur, posing a serious challenge to the normal operation of wind power blades. Under extreme wind conditions, the load borne by the wind power blades increases significantly, which can cause the wind power blades to rotate too fast. When the load borne by the wind power blades exceeds the structural strength limit of the wind power blades, problems such as distortion, deformation, and even breakage can occur, posing a great safety hazard.

[0028] To solve the above problems, existing wind power generation equipment begins to try to set a shunt air duct on the wind power blade, so that part of the airflow directly passes through the wind power blade through the shunt air duct, thereby reducing the total airflow shunted to the suction surface and the pressure surface of the wind power blade, so as to quickly reduce the lift of the wind power blade, achieve the effect of load reduction, and avoid overloading operation of the wind power blade under extreme wind conditions and cause structural damage. However, the shunt scheme of the above wind power blade cannot adapt to the actual wind power change in time, and has the problem of response lag. This lag either causes excessive airflow to escape and weaken the blade lift when the wind power does not reach the extreme level, resulting in a decrease in power generation efficiency, or causes the load reduction measure to fail to adapt in time when the wind power rises to the extreme level, making it difficult to fully dissipate the kinetic energy of the airflow, thereby failing to effectively avoid the risk of structural damage of the wind power blade due to overloading.

[0029] To solve the above problems, the application provides a self-adaptive load-reducing wind turbine blade assembly, which comprises a first cylinder, a second cylinder and a third cylinder arranged coaxially in the front-rear direction inside a blade body to form a first load-reducing channel, a second load-reducing channel and a third load-reducing channel distributed in the radial direction from outside to inside in sequence; during the process that a cover plate assembly at the leading edge of the blade body is opened inward under the action of wind force, the air inlet will be communicated with different load-reducing channels when the cover plate assembly is at different opening degrees, so that the blade body obtains corresponding light load-reducing effect, medium load-reducing effect or heavy load-reducing effect, thus realizing the hierarchical self-adaptive adjustment of the load-reducing effect of the wind turbine blade, fully reducing the load under large wind force and maintaining the lift under small wind force, so that a good balance between power generation efficiency and structural safety can be achieved.

[0030] Please refer to Figures 1 to 8 The self-adaptive load-reducing wind turbine blade assembly provided by the embodiments of the application comprises: A blade body 1 having a suction surface 101 and a pressure surface 102 arranged oppositely in the thickness direction and having a leading edge 103 and a trailing edge 104 arranged oppositely in the width direction; the leading edge 103 is provided with an air inlet 1031, and the trailing edge 104 is provided with an air outlet 1041; A first cylinder 2 arranged inside the blade body 1; the rear end of the first cylinder 2 is communicated with the air outlet 1041; A second cylinder 3 fixed coaxially in the inner cavity of the first cylinder 2; the first load-reducing channel 201 is formed between the second cylinder 3 and the first cylinder 2; A third cylinder 4 fixed coaxially in the inner cavity of the second cylinder 3; the second load-reducing channel 301 is formed between the third cylinder 4 and the second cylinder 3, and the inner cavity of the third cylinder 4 forms the third load-reducing channel 401; A spiral vane 5 spirally extending in the front-rear direction in the first load-reducing channel 201; A plurality of elastic swing plates 6 distributed in the second load-reducing channel 301; A cover plate assembly 7 in a double-door structure and hinged to the leading edge 103 to cover the air inlet 1031; An elastic return member 8, one end of which is connected with the blade body 1 and the other end of which is connected with the first cylinder 2; the elastic return member 8 applies an elastic forward force to the first cylinder 2 to push the front end of the first cylinder 2 against the inner side of the cover plate assembly 7; The cover plate assembly 7 is used to open inward against the elastic action of the elastic return member 8 under the impact of external airflow, and the opening amplitude of the cover plate assembly 7 is proportional to the flow rate of the external airflow; as the opening amplitude gradually increases, the third load-reducing channel 401, the second load-reducing channel 301 and the first load-reducing channel 201 are sequentially communicated with the air inlet 1031.

[0031] In the embodiment, the suction surface 101 and the pressure surface 102 of the blade body 1 are both arc surfaces in accordance with aerodynamic design, the front side of the suction surface 101 and the front side of the pressure surface 102 are smoothly connected at the leading edge 103, and the rear side of the suction surface 101 and the rear side of the pressure surface 102 are smoothly connected at the trailing edge 104; the structure can make the airflow flow smoothly along the suction surface 101 and the pressure surface 102, and form a stable pressure difference between the suction surface 101 and the pressure surface 102 based on Bernoulli's principle, thereby generating lift to push the blade body 1 to rotate, providing a power basis for wind power generation. The leading edge 103 is the initial contact end of the airflow, and the air inlet 1031 opened at the leading edge 103 can directly capture the incoming airflow, providing an entrance for subsequent airflow shunting to the load reduction channel; the air outlet 1041 opened at the trailing edge 104 is in communication with the rear end of the first cylinder 2, the rear end of the second cylinder 3, and the rear end of the third cylinder 4, forming a complete airflow discharge path of "air inlet 1031-load reduction channel-air outlet 1041".

[0032] The first cylinder 2 is arranged inside the blade body 1 along the length direction of the blade body 1, and the axis thereof is substantially parallel to the length direction of the blade body 1, so as to ensure that the airflow can stably flow along the extension direction of the blade body 1. The rear end of the first cylinder 2 is sealingly connected with the air outlet 1041, which can effectively prevent the airflow from leaking from the connection gap, and ensure that the airflow treated by the first load reduction channel 201 is discharged through the air outlet 1041. The core function of the first cylinder 2 is to serve as an outer carrier of the first load reduction channel 201, cooperate with the coaxially fixed second cylinder 3 to form a ring-shaped first load reduction channel 201, and provide stable mounting support for the spiral blade 5, so as to ensure that the spiral blade 5 can maintain structural stability under the impact of the airflow, so as to fully play the role of kinetic energy dissipation.

[0033] The second cylinder body 3 can be coaxially fixed in the inner cavity of the first cylinder body 2 through the radially distributed support ribs, and the annular space formed between the second cylinder body 3 and the first cylinder body 2 is the first load reduction channel 201, and the annular space formed between the second cylinder body 3 and the third cylinder body 4 is the second load reduction channel 301; a plurality of elastic pendulums 6 are spaced apart along the circumferential and axial directions of the second load reduction channel 301, one end of the elastic pendulum 6 is fixedly connected with the inner side wall of the second cylinder body 3 or the outer side wall of the third cylinder body 4, and the other end of the elastic pendulum 6 is a free end, and the material of the elastic pendulum 6 is selected from an elastic material (such as an elastic alloy or a reinforced elastomer) with good elasticity and fatigue resistance, so that the elastic pendulum 6 is not prone to breakage or permanent deformation under long-term airflow impact. The design purpose of the elastic pendulum 6 is to dissipate the kinetic energy of the airflow at a moderate intensity; specifically, when the airflow flows through the second load reduction channel 301, it continuously impacts the free end of the elastic pendulum 6, pushes the elastic pendulum 6 to vibrate and adaptively deforms, and in this process, the elastic pendulum 6 cuts the airflow and breaks the large-scale vortex flow therein, converting it into small-scale turbulent flow, and at the same time, the interaction between the elastic pendulum 6 and the airflow and the collision between the airflow inside the turbulent flow dissipate part of the kinetic energy of the airflow, providing support for subsequent moderate load reduction.

[0034] The third cylinder body 4 is coaxially fixed in the inner cavity of the second cylinder body 3 through the radially distributed support ribs, so that the axes of the first cylinder body 2, the second cylinder body 3 and the third cylinder body 4 coincide, forming a stable nested structure. The inner cavity of the third cylinder body 4 constitutes the third load reduction channel 401, and no kinetic energy dissipation structure is specially designed in the third load reduction channel 401, and only limited kinetic energy dissipation is achieved by the friction between the airflow and the inner side wall of the third cylinder body 4 during the airflow flow process. This design makes the main function of the third load reduction channel 401 focus on basic flow splitting, that is, part of the incoming airflow is directly guided outward along the airflow path of “front edge 103-third load reduction channel 401-rear edge 104”, and the total amount of airflow flowing to the suction surface 101 and the pressure surface 102 is reduced by flow splitting, without significantly weakening the kinetic energy of the airflow.

[0035] The spiral vane 5 extends in the front-rear direction in the first load reduction channel 201, the outer edge of the spiral vane 5 is fixedly connected with the inner side wall of the first cylinder body 2, and the inner edge of the spiral vane 5 is fixedly connected with the outer side wall of the second cylinder body 3. The core function of the spiral vane 5 is to dissipate the kinetic energy of the airflow at a high intensity; when the airflow enters the first load reduction channel 201, it moves along a spiral path under the guidance of the spiral vane 5, and in this process, the airflow continuously and violently rubs and collides with the inner side wall of the first cylinder body 2, the outer side wall of the second cylinder body 3 and the surface of the spiral vane 5, and the centrifugal effect generated by the spiral motion intensifies the interaction between the airflow and the channel wall, a large amount of airflow kinetic energy is converted into heat energy dissipation in this process, which can significantly reduce the flow rate of the airflow when it flows to the rear edge 104.

[0036] The cover plate assembly 7 is in a double-door structure and is hingedly connected to the leading edge 103 of the blade body 1. The two door bodies of the cover plate assembly 7 are sized to match the size of the air inlet 1031, so as to completely cover the air inlet 1031 when closed, preventing external impurities from entering the inside of the blade body 1. The installation position of the hinge should ensure that the two door bodies of the cover plate assembly 7 can only rotate inwardly and will not interfere with other internal structures of the blade body 1 during rotation.

[0037] The elastic return member 8 can be a compression spring or the like. One end of the elastic return member 8 is connected to a fixed structure inside the blade body 1, and the other end of the elastic return member 8 can be connected to the rear end of the first cylinder 2. The elastic return member 8 can be evenly arranged in multiple numbers along the circumference of the first cylinder 2, so as to ensure the uniformity of the forward elastic force acting on the first cylinder 2 and avoid tilting of the first cylinder 2 due to uneven force, thereby affecting the abutting effect of the first cylinder 2 and the cover plate assembly 7. The elastic return member 8 can provide sufficient elastic force to push the front end of the first cylinder 2 to tightly abut against the inner side of the cover plate assembly 7, so as to keep the cover plate assembly 7 in a closed state. When the wind speed increases, the impact force of the airflow on the cover plate assembly 7 exceeds the elastic force of the elastic return member 8, the cover plate assembly 7 will open inwardly, and the opening amplitude of the cover plate assembly 7 linearly increases with the increase of the wind speed. When the wind speed decreases, the impact force of the airflow decreases, and the elastic force of the elastic return member 8 will push the first cylinder 2 to move forward, and then the first cylinder 2 will push the cover plate assembly 7 to rotate outwardly, so as to gradually close the air inlet 1031. The automatic reset of the cover plate assembly 7 and the first cylinder 2 can be achieved without relying on external driving devices.

[0038] During actual operation, the three load reduction channels in the blade body 1 can realize graded load reduction through the opening adjustment of the cover plate assembly 7 based on the gradient change of the external wind speed. The specific action mechanism is as follows: As shown in Figure 1 and Figure 2 When the flow rate of the external airflow is in the conventional power generation wind condition interval, the impact force of the airflow on the cover plate assembly 7 is less than the elastic force of the elastic return member 8, the cover plate assembly 7 remains closed, the air inlet 1031 is not connected with each load reduction channel, and the suction surface 101 and the pressure surface 102 of the blade body 1 can form a stable aerodynamic lift, thereby ensuring the rated power generation efficiency of the unit.

[0039] As shown in Figure 3 and Figure 4As shown, when the wind speed rises to the first preset threshold, the impact force of the airflow on the cover plate assembly 7 breaks through the elastic constraint of the elastic return member 8, and the cover plate assembly 7 is slightly opened inward, at this time only the third load reduction channel 401 is in communication with the air inlet 1031; no special kinetic energy dissipation structure is arranged in the third load reduction channel 401, the airflow flowing through the third load reduction channel 401 only produces friction with the inner side wall of the third cylinder 4 to realize limited kinetic energy dissipation, and the airflow flow rate does not significantly attenuate, and the airflow flowing to the trailing edge 104 cannot form a high-pressure area that can suppress the overall flow of the airflow, and its load reduction effect mainly depends on the basic flow splitting effect to reduce the total amount of airflow flowing from the leading edge 103 to the suction surface 101 and the pressure surface 102, thereby achieving light load reduction. This light load reduction stage can control the small increase of the blade load while preferentially guaranteeing the power generation efficiency of the unit, avoiding excessive loss of power generation under non-extreme wind conditions.

[0040] As Figure 5 and Figure 6As shown, when the wind speed continues to rise to a second preset threshold, the airflow impact force further increases, causing the inward opening amplitude of the cover plate assembly 7 to further expand, and at this time, the second load shedding passage 301 is in communication with the air inlet 1031 with the rotation of the cover plate assembly 7. On the one hand, compared with the stage where only the third load shedding passage 401 is in communication with the air inlet 1031, the effective flow cross section of the air inlet 1031 and the load shedding passage is further expanded at this stage, and more airflow at the leading edge 103 can enter the third load shedding passage 401 and the second load shedding passage 301 through the air inlet 1031, respectively, and the basic flow splitting effect is enhanced, that is, the total amount of airflow split to the load shedding passage is significantly increased compared with before, which will directly lead to a further reduction in the total amount of airflow that should flow to the suction surface 101 and the pressure surface 102. On the other hand, the airflow flowing through the second load shedding passage 301 continuously impacts the elastic pendulum plate 6, pushing the elastic pendulum plate 6 to produce periodic vibration and adaptive deformation. In this process, the elastic pendulum plate 6 will cut the airflow and break large-scale vortexes to convert them into small-scale turbulent flows. Through the collision and mixing of airflow inside the turbulent flow and the interaction between the elastic pendulum plate 6 and the airflow, a moderate degree of kinetic energy consumption of the airflow can be achieved, so that the flow rate of the airflow flowing to the trailing edge 104 is significantly attenuated to a certain extent; according to Bernoulli's principle, flow rate attenuation will increase the air pressure at the trailing edge 104, thereby reducing the air pressure difference between the leading edge 103 and the trailing edge 104; based on the characteristics of airflow flowing from a high-pressure area to a low-pressure area, this reduction in air pressure difference can inhibit the overall flow trend of the airflow from front to back to a certain extent, thereby further reducing the airflow flowing from the leading edge 103 to the suction surface 101 and the pressure surface 102. Based on the above mechanism, the enhanced basic flow splitting effect and the kinetic energy dissipation effect of the elastic pendulum plate 6 form a synergistic effect, and under the combined action of the double mechanisms, the total amount of airflow flowing to the suction surface 101 and the pressure surface 102 is further controlled, and the lift of the blade body 1 is significantly reduced, thereby achieving moderate load shedding, which can accurately adapt to the working condition where the wind force is moderately high, the blade load needs to be further controlled, but does not need to be excessively reduced, while ensuring the safety of the blade structure, the effective power generation efficiency of the unit can still be maintained.

[0041] As Figure 7 and Figure 8As shown, when the wind speed rises to a third preset threshold (i.e. an extreme wind condition interval), the airflow impact force reaches a maximum value, the cover plate assembly 7 will open inwardly to a maximum opening degree, the first load reduction channel 201 is in communication with the air inlet 1031, and the airflow enters the three load reduction channels synchronously. Among them, the airflow flowing through the first load reduction channel 201 moves along a spiral trajectory under the guidance of the spiral blade 5, and the airflow and the inner side wall of the first cylinder 2, the outer side wall of the second cylinder 3 and the surface of the spiral blade 5 produce continuous and violent friction and collision. At the same time, the centrifugal action caused by the spiral motion will intensify the momentum exchange between the airflow and the channel wall surface, a large amount of airflow kinetic energy will be converted into heat energy dissipation, so that the flow rate of the airflow flowing to the trailing edge 104 is greatly reduced, thereby a local high pressure area can be formed at the trailing edge 104, and the overall flow trend of the airflow from front to back is significantly inhibited; superimposed with the flow splitting effect and kinetic energy dissipation effect of the second load reduction channel 301 and the third load reduction channel 401, the total amount of airflow flowing from the leading edge 103 to the suction surface 101 and the pressure surface 102 is maximally reduced, heavy load reduction can be achieved, the load borne by the blade body 1 can be controlled within the structural strength limit range, and the safety risks such as blade distortion, deformation and fracture under extreme wind conditions can be effectively avoided.

[0042] It can be seen that, by the coaxial nesting of the first load shedding channel 201, the second load shedding channel 301 and the third load shedding channel 401 in the blade body 1, the cooperative design of the cover plate assembly 7 at the leading edge 103 and the elastic reset member 8, the self-adaptive hierarchical load shedding based on the change of wind speed is realized; under the conventional power generation wind condition, the cover plate assembly 7 is kept closed under the action of the elastic reset member 8, which can ensure the stable lift of the surface of the blade body 1 and guarantee the rated power generation efficiency of the unit; when the wind speed rises to the first preset threshold, the cover plate assembly 7 is slightly opened, the third load shedding channel 401 is communicated with the air inlet 1031, a small amount of airflow flowing to the suction surface 101 and the pressure surface 102 can be reduced through the basic flow splitting effect, the light load shedding is realized, and the excessive loss of power generation is preferentially avoided; when the wind speed further rises to the second preset threshold, the opening of the cover plate assembly 7 continues to expand so that the third load shedding channel 401 and the second load shedding channel 301 are communicated with the air inlet 1031, the flow splitting effect can be enhanced through the expansion of the effective flow passage area, and the airflow kinetic energy is dissipated with the help of the elastic flap 6, which is combined with the air pressure rise at the trailing edge 104 to suppress the overall airflow, so that the moderate load shedding is realized under the double action, and the structural safety and the power generation efficiency are balanced; when the wind speed reaches the third preset threshold of the extreme wind condition, the cover plate assembly 7 is completely opened and the third load shedding channel 401, the second load shedding channel 301 and the first load shedding channel 201 are communicated with the air inlet 1031, the spiral vane 5 will guide the airflow to spiral motion, and the high-intensity kinetic energy dissipation is realized through the violent friction and collision, the maximum flow splitting effect of the three load shedding channels and the local high pressure at the trailing edge 104 are superimposed, the airflow flowing to the suction surface 101 and the pressure surface 102 can be reduced to the maximum extent, and the heavy load shedding is realized, which can effectively avoid the risk of structural damage of the wind power blade. The embodiment scheme does not need external driving, but relies on airflow impact and elastic reset member 8 to complete automatic response and reset, can accurately match the load shedding demand under different wind conditions, so that the blade body 1 obtains corresponding light load shedding effect, moderate load shedding effect or heavy load shedding effect, so that the hierarchical self-adaptive adjustment of the load shedding effect of the wind power blade is realized, the load can be fully reduced under large wind force, and the lift can be maintained under small wind force, so that a good balance between the power generation efficiency of the unit and the structural safety of the wind power blade can be achieved.

[0043] In an embodiment, referring to Figures 1 to 8 The suction surface 101 is provided with a plurality of arrayed turbulence holes 1011, and the gas outlet direction of the turbulence holes 1011 is perpendicular to the suction surface 101. The adaptive load shedding wind power blade assembly further comprises a gas supply device 9, and the gas storage chamber of the gas supply device 9 is communicated with at least one of the first cylinder 2, the second cylinder 3 and the third cylinder 4; the gas supply device 9 is used for supplying gas to the turbulence holes 1011, so as to reduce the gas flow rate of the suction surface 101 through the airflow ejected outward by the turbulence holes 1011, thereby reducing the lift of the blade body 1.

[0044] Specifically, the spoiler air hole 1011 can be provided as a micro-hole structure; the air outlet direction of the spoiler air hole 1011 is perpendicular to the suction surface 101, which means that the axis of the spoiler air hole 1011 is perpendicular to the tangent plane of the suction surface 101 at the spoiler air hole 1011 (or the axis of the spoiler air hole 1011 is parallel to the normal line of the suction surface 101 at the spoiler air hole 1011); in this way, the air flow direction of the air jetted outward by the spoiler air hole 1011 is close to perpendicular to the flow direction of the external air flow on the surface of the suction surface 101, that is, the air jetted outward by the spoiler air hole 1011 can hinder the external air flow flowing on the surface of the suction surface 101, so as to slow down the flow speed of the air flow on the surface of the suction surface 101, thereby increasing the air pressure at the suction surface 101; in the case that the air pressure at the pressure surface 102 remains unchanged, the air pressure difference between the suction surface 101 and the pressure surface 102 will decrease, so that the lift required to be borne by the blade body 1 decreases, thereby realizing the load reduction of the blade body 1 under extreme wind conditions.

[0045] The air supply device 9 includes an air storage chamber and an air pump, and the air pump can pump the gas in the air storage chamber outward. The air supply device 9 can be accommodated in the interior of the blade body 1, and the air supply device 9 can be connected with the spoiler air hole 1011 through a corresponding valve structure; by controlling the opening and closing of the valve structure, the air supply device 9 can supply air to the spoiler air hole 1011 according to actual use requirements.

[0046] Based on the above arrangement, the active load reduction of the blade body 1 can be realized by supplying air to the spoiler air hole, which can be matched with the passive load reduction mode of the first cylinder 2, the second cylinder 3 and the third cylinder 4, so as to avoid the structural damage caused by the overload operation of the blade body 1 under large wind speed, and is beneficial to further improve the structural stability, operation safety and environmental adaptability of the wind turbine blade assembly.

[0047] Further, part of the air flow entering the first load reduction channel 201, the second load reduction channel 301 and the third load reduction channel 401 through the air inlet 1031 can be collected into the air storage chamber of the air supply device 9, so as to realize the air supplement of the air supply device 9, and make the air supply device 9 continuously supply air to the spoiler air hole 1011.

[0048] In an embodiment, referring to Figures 1 to 8 , the spoiler air hole 1011 is in communication with the outer peripheral side of the first load reduction channel 201.

[0049] In the present embodiment, when the air flow flows in the spiral first load reduction channel 201, the air flow will gather to the outer peripheral side of the first load reduction channel 201 under the centrifugal action; by communicating the spoiler air hole 1011 with the outer peripheral side of the first load reduction channel 201, the air flow gathered to the outer peripheral side of the first load reduction channel 201 under the centrifugal action can be jetted outward by the spoiler air hole 1011 under a certain kinetic energy, so as to realize the active load reduction.

[0050] Based on the above setting, part of the airflow entering the first load shedding passage 201 can be directly used for gas injection of the spoiler air hole 1011, without the need for the gas supply device 9 to supply gas to the spoiler air hole 1011 after being supplemented into the gas storage chamber, that is, the gas injection operation of the spoiler air hole 1011 can be completed based on the kinetic energy of the airflow itself without relying entirely on the gas supply device 9, thus improving the response speed and load shedding efficiency and reducing energy consumption.

[0051] In an embodiment, referring to Figures 1 to 8 The adaptive load shedding wind turbine blade assembly further comprises a limiting stopper 10 arranged inside the blade body 1. When the first cylinder 2 is pushed by the inwardly opening cover plate assembly 7 to move rearward to the critical position, the limiting stopper 10 is used to abut against the first cylinder 2 to prevent the first cylinder 2 from continuing to move rearward.

[0052] The limiting stopper 10 is fixedly arranged inside the blade body 1 and can be installed on the preset path of the rearward movement of the first cylinder 2 by welding or bolt connection, for example, on the support rib plate or inner wall near one side of the trailing edge 104 of the blade body 1, and the installation position thereof needs to correspond to the rear end position of the first cylinder 2 to ensure accurate abutment when the first cylinder 2 moves rearward to the critical position.

[0053] When the external wind speed increases, the cover plate assembly 7 opens inwardly under the impact of airflow and pushes the first cylinder 2 to move rearward against the elastic force of the elastic return member 8, and as the first cylinder 2 moves rearward, the rear end thereof gradually approaches the limiting stopper 10; when the first cylinder 2 moves rearward to the critical position (which is a pre-designed safety threshold corresponding to the maximum safe opening amplitude of the cover plate assembly 7, and can avoid excessive opening of the cover plate assembly 7 to cause structural interference or failure of the elastic return member 8), the rear end of the first cylinder 2 will abut against the limiting stopper 10, and the limiting stopper 10 will block the first cylinder 2 from continuing to move rearward.

[0054] This design can effectively prevent the first cylinder 2 from being excessively compressed to lose the elastic function of the elastic return member 8 due to excessive rearward movement, and can also avoid collision and damage of the first cylinder 2 with the components around the exhaust port 1041 at the trailing edge 104 in the blade body 1, and can indirectly limit the maximum opening amplitude of the cover plate assembly 7 to ensure that the flow area of the load shedding passage remains within a safe range, avoid excessive airflow diversion to affect the normal aerodynamic performance of the blade body 1, and further improve the structural safety and operation stability of the adaptive load shedding wind turbine blade assembly.

[0055] In an embodiment, referring to Figures 1 to 8The adaptive load-reducing wind turbine blade assembly further comprises a flexible buffer layer 11 arranged on the inner side of the cover plate assembly 7, which is used to adhere to the front end of the first cylinder 2.

[0056] The flexible buffer layer 11 is made of a material with good elasticity and sealing performance (such as silicone rubber, polyurethane foam, etc.), which can be fixed on the inner side of the cover plate assembly 7 by bonding, and the coverage area of the flexible buffer layer 11 on the inner side of the cover plate assembly 7 corresponds to the abutting surface of the front end of the first cylinder 2.

[0057] When the cover plate assembly 7 is in the closed state, the front end of the first cylinder 2 will tightly adhere to the surface of the flexible buffer layer 11 under the push of the elastic return member 8. By arranging the flexible buffer layer 11, on the one hand, it can fill the small gap between the first cylinder 2 and the cover plate assembly 7, avoiding air leakage from the gap to the load-reducing channel at low wind speed, and ensuring the normal lift generation of the suction surface 101 and the pressure surface 102 of the blade body 1; on the other hand, during the opening and closing process of the cover plate assembly 7, the flexible buffer layer 11 can buffer the rigid collision between the first cylinder 2 and the cover plate assembly 7, reduce the wear and noise when the two are in contact, and prolong the service life of the cover plate assembly 7 and the first cylinder 2.

[0058] In addition, the elastic properties of the flexible buffer layer 11 can also adapt to the slight displacement of the first cylinder 2 caused by airflow impact, always maintaining the stable adhesion of the first cylinder 2 and the cover plate assembly 7, thereby further improving the reliability of the assembly operation.

[0059] In an embodiment, referring to Figures 1 to 8 The spiral blade 5 is provided with a plurality of flow-through holes 501, which are in communication with the first load-reducing channel 201.

[0060] The embodiment scheme increases the complexity of the airflow path. When the airflow is transported forward in a spiral shape along the first load-reducing channel 201, part of the airflow will pass through the flow-through holes 501 to generate additional friction, viscosity and damping effects, and the airflow passing through the flow-through holes 501 will generate a turbulent flow effect on the airflow transported forward in a spiral shape along the first load-reducing channel 201. In this way, more kinetic energy of the airflow can be converted into heat energy and dissipated, thereby further improving the load-reducing effect.

[0061] In an embodiment, referring to Figures 1 to 8 The cylinder wall of the second cylinder 3 is provided with dispersion air holes 302, which are in communication with the first load-reducing channel 201 and the second load-reducing channel 301.

[0062] In the embodiment, a plurality of dispersion holes 302 are uniformly arranged on the wall of the second cylinder 3 in the circumferential and axial directions. The dispersion holes 302 penetrate the wall of the second cylinder 3, one end of the dispersion holes 302 is communicated with the first load reduction channel 201, and the other end of the dispersion holes 302 is communicated with the second load reduction channel 301. The diameter and spacing of the dispersion holes 302 are designed according to the requirement of air flow disturbance, which not only ensures the smooth flow of air, but also avoids excessive weakening of the structural strength of the second cylinder 3.

[0063] When the air flow flows in the first load reduction channel 201 and the second load reduction channel 301, the dispersion holes 302 break the relative independent state of the air flow in the two load reduction channels. In the first load reduction channel 201, part of the spiral air flow guided by the spiral vane 5 flows into the second load reduction channel 301 through the dispersion holes 302 to impact the elastic pendulum 6 in the second load reduction channel 301 and disturb the original turbulent structure. At the same time, the air flow in the second load reduction channel 301 also flows into the first load reduction channel 201 through the dispersion holes 302 to interfere with the stable flow trajectory of the spiral air flow.

[0064] Based on the above process of air flow interpenetration and impact, more intense vortex collision and air flow shear effect will be generated, which further disperses the originally relatively orderly air flow, promotes more air flow kinetic energy to be converted into internal energy (such as friction heat), and significantly improves the conversion efficiency of air flow kinetic energy to internal energy. When the kinetic energy dissipation efficiency is improved, the flow rate of the air flow flowing to the trailing edge 104 will be further reduced, the air pressure difference between the leading edge 103 and the trailing edge 104 will be reduced more significantly, and the inhibition of the air flow flowing from front to back will be stronger, so that the total amount of air flow flowing to the suction surface 101 and the pressure surface 102 is further reduced, and finally the load reduction effect under the corresponding wind condition can be improved.

[0065] In an embodiment, referring to Figures 1 to 8 The adaptive load reduction wind power blade assembly further comprises a semiconductor thermoelectric power generation sheet 12 attached to the wall of the first cylinder 2, the wall of the second cylinder 3, and the wall of the third cylinder 4. The semiconductor thermoelectric power generation sheet 12 is used to convert the internal energy generated by the air flow in the first load reduction channel 201, the second load reduction channel 301, and the third load reduction channel 401 into electrical energy.

[0066] Specifically, the semiconductor thermoelectric power generation sheet 12 is usually composed of two different semiconductor materials (such as N-type semiconductor and P-type semiconductor), and a thermocouple is formed by connecting the two semiconductor materials with a metal conductor. When one end of the semiconductor thermoelectric power generation sheet 12 is heated (usually called hot end) and the other end maintains a lower temperature (usually called cold end), due to the thermoelectric effect, electrons will move from the hot end to the cold end, thereby generating a potential difference between the hot end and the cold end. When an external circuit is connected to the semiconductor thermoelectric power generation sheet 12, electrons will flow through the external circuit to supply power to the external load.

[0067] Based on the above principle, the hot end of the semiconductor thermoelectric power generation sheet 12 can be arranged on the cylinder wall of the first cylinder 2, the cylinder wall of the second cylinder 3, and the cylinder wall of the third cylinder 4, and the cold end of the semiconductor thermoelectric power generation sheet 12 can be arranged at a position with lower temperature in the vane body 1. In this way, the internal energy obtained by converting the kinetic energy of the airflow in the first unloading channel 201, the second unloading channel 301, and the third unloading channel 401 can be further converted into electrical energy, and the converted electrical energy can be used to power other devices, thereby realizing the recycling of energy.

[0068] In an embodiment, referring to Figures 1 to 8 , the plurality of elastic pendulums 6 are uniformly arranged along the circumference of the second cylinder 3.

[0069] Specifically, based on the uniform arrangement of the elastic pendulums 6 along the circumference of the second cylinder 3, it can be ensured that the airflow flowing through the second unloading channel 301 can uniformly impact each elastic pendulum 6, avoiding vortex turbulence caused by local airflow concentration, and ensuring that the kinetic energy dissipation effect is evenly distributed in the circumferential direction, thereby improving the unloading stability.

[0070] In an embodiment, referring to Figures 1 to 8 , the elastic pendulum 6 is arranged in a hollow structure.

[0071] Specifically, a plurality of circular or strip-shaped hollow holes can be arranged on the elastic pendulum 6, or the elastic pendulum 6 can be arranged in a hollow structure. In this way, the overall weight of the elastic pendulum 6 can be reduced, the vibration sensitivity when the airflow impacts can be improved, and the double effects of “shunting and turbulence” can be achieved by allowing part of the airflow to pass through the hollow part, intensifying the internal collision of the airflow, and further enhancing the kinetic energy dissipation effect.

[0072] In an embodiment, referring to Figures 1 to 8 , the surface of the elastic pendulum 6 is provided with a plurality of spaced-apart convex rib structures (not shown in the figure) and groove structures (not shown in the figure), and the convex rib structures and the groove structures are in a wave shape.

[0073] Based on the wave-shaped convex rib structures and groove structures on the surface of the elastic pendulum 6, the contact area between the airflow and the elastic pendulum 6 can be increased. When the airflow flows through the surface of the elastic pendulum 6, the convex rib structures can block the airflow and form local vortex, and the groove structures can guide the airflow to change direction. Through the synergistic effect of the two, the airflow flow trajectory can be disturbed, and the kinetic energy dissipation can be further enhanced by increasing the shear effect of the airflow.

[0074] In an embodiment, referring to Figures 1 to 8 , at least one elastic pendulum 6 is embedded with a counterweight (not shown in the figure).

[0075] By setting the counterweight, the gravity center position of the elastic pendulum 6 can be adjusted to optimize the vibration frequency, so that the elastic pendulum 6 can produce stable vibration under different wind speeds (corresponding to different airflow impact intensity), and the elastic pendulum 6 can be prevented from losing vibration due to airflow speed change, and the consistency of kinetic energy dissipation effect can be ensured. In addition, the counterweight can change the overall mass distribution and gravity center position of the elastic pendulum 6, so as to adjust the natural vibration frequency of the elastic pendulum 6, so that the natural frequency deviates from the frequency range of airflow impact under different wind speeds, and the resonance phenomenon can be effectively avoided, so that the elastic pendulum 6 can be prevented from being damaged due to resonance.

[0076] The embodiment of the present application also provides a wind turbine generator, please refer to Figures 1 to 8 The wind turbine generator comprises the self-adaptive load reduction wind power blade assembly in any of the above embodiments.

[0077] In the embodiment, the blade body 1 can convert wind energy into mechanical energy during rotation, and the wind turbine generator can utilize part of the mechanical energy to drive the rotor to rotate to generate electric energy, and finally output in the form of alternating current, so as to realize power generation.

[0078] The specific structure of the adaptive load shedding wind power blade assembly will be described with reference to the above embodiments. Since the wind turbine generator set in this embodiment adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, that is, through the cooperative design of the first load shedding channel 201, the second load shedding channel 301 and the third load shedding channel 401 coaxially nested in the blade body 1, the cover plate assembly 7 at the leading edge 103 and the elastic reset member 8, adaptive hierarchical load shedding based on wind speed changes is realized; under conventional power generation wind conditions, the cover plate assembly 7 is closed under the action of the elastic reset member 8, which can ensure the stable lift of the surface of the blade body 1 and protect the rated power generation efficiency of the unit; when the wind speed rises to the first preset threshold, the cover plate assembly 7 is slightly opened, so that the third load shedding channel 401 is in communication with the air inlet 1031, a small amount of airflow flowing to the suction surface 101 and the pressure surface 102 can be reduced through the basic flow splitting effect, and light load shedding is realized to avoid excessive loss of power generation; when the wind speed further rises to the second preset threshold, the cover plate assembly 7 continues to expand the opening degree so that the third load shedding channel 401 and the second load shedding channel 301 are in communication with the air inlet 1031, which can not only enhance the flow splitting effect through the expansion of the effective flow passage cross section, but also dissipate the kinetic energy of the airflow with the help of the elastic flap 6, and cooperate with the air pressure rise at the trailing edge 104 to suppress the overall airflow, so as to realize moderate load shedding under the dual action to balance the structural safety and power generation efficiency; when the wind speed reaches the third preset threshold of the extreme wind condition, the cover plate assembly 7 is completely opened and the third load shedding channel 401, the second load shedding channel 301 and the first load shedding channel 201 are in communication with the air inlet 1031, the spiral blade 5 will guide the airflow to spiral motion, realize high-intensity kinetic energy dissipation through violent friction and collision, superimpose the maximum flow splitting effect of the three load shedding channels and the local high pressure at the trailing edge 104, and can greatly reduce the airflow flowing to the suction surface 101 and the pressure surface 102 to realize heavy load shedding, which can effectively avoid the risk of structural damage of the wind power blade. This scheme does not need external driving, but relies on airflow impact and elastic reset member 8 to complete automatic response and reset, can accurately match the load shedding demand under different wind conditions, so that the blade body 1 obtains light load shedding effect, moderate load shedding effect or heavy load shedding effect, so as to realize hierarchical adaptive adjustment of the load shedding effect of the wind power blade, which can fully reduce the load under large wind force and maintain the lift under small wind force, so as to achieve a good balance between the power generation efficiency of the unit and the structural safety of the wind power blade.

[0079] It should be noted that other contents of the adaptive load shedding wind power blade assembly and the wind turbine generator set disclosed in the present application can be referred to the prior art, which will not be described here.

[0080] The above merely illustrates the embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, within the technical concept of the present application, and based on the content of the present application and the accompanying drawings, are included in the patent protection scope of the present application.

Claims

1. An adaptive de-loading wind turbine blade assembly, characterized by, The adaptive load-reducing wind turbine blade assembly comprises: a blade body having a suction surface and a pressure surface arranged oppositely along a thickness direction, and having a leading edge and a trailing edge arranged oppositely along a width direction; the leading edge is provided with an air inlet, and the trailing edge is provided with an air outlet; a first cylinder arranged in the interior of the blade body; the rear end of the first cylinder is in communication with the air outlet; a second cylinder coaxially fixed in the inner cavity of the first cylinder; a first load-reducing channel is formed between the first cylinder and the second cylinder; a third cylinder coaxially fixed in the inner cavity of the second cylinder; a second load-reducing channel is formed between the second cylinder and the third cylinder, and the inner cavity of the third cylinder forms a third load-reducing channel; a spiral vane spirally extending along the front-rear direction in the first load-reducing channel; a plurality of elastic swing plates distributed in the second load-reducing channel; a cover plate assembly in a double-door structure and hinged to the leading edge to cover the air inlet; an elastic return member, one end of which is connected to the blade body and the other end of which is connected to the first cylinder; the elastic return member applies an elastic forward force to the first cylinder to push the front end of the first cylinder against the inner side of the cover plate assembly; the cover plate assembly is used to overcome the elastic force of the elastic return member and open inwardly under the impact of external airflow, and the opening amplitude of the cover plate assembly is proportional to the flow rate of external airflow; as the opening amplitude gradually increases, the third load-reducing channel, the second load-reducing channel, and the first load-reducing channel are sequentially communicated with the air inlet.

2. The self-adapting de-loading wind blade assembly of claim 1, wherein, The suction surface is provided with a plurality of arrayed turbulence orifices, and the air outlet direction of the turbulence orifices is perpendicular to the suction surface. The adaptive load-reducing wind turbine blade assembly further comprises a gas supply device, the gas storage chamber of the gas supply device is in communication with at least one of the first cylinder, the second cylinder, and the third cylinder; the gas supply device is used to supply gas to the turbulence orifices to reduce the gas flow rate of the suction surface through the airflow ejected outwardly by the turbulence orifices, thereby reducing the lift of the blade body.

3. The self-adapting de-loading wind blade assembly of claim 2, wherein, The turbulence orifices are in communication with the outer circumferential side of the first load-reducing channel.

4. The self-adapting de-loading wind blade assembly of claim 1, wherein, The adaptive load-reducing wind turbine blade assembly further comprises a limiting stopper arranged in the interior of the blade body; when the first cylinder moves rearward to a critical position under the pushing of the inwardly opening cover plate assembly, the limiting stopper is used to abut against the first cylinder to prevent the first cylinder from continuing to move rearward.

5. The self-adapting de-loading wind blade assembly of claim 1, wherein, The adaptive load-reducing wind turbine blade assembly further comprises a flexible buffer layer arranged on the inner side of the cover plate assembly, and the flexible buffer layer is used to fit the front end of the first cylinder.

6. The self-adapting de-loading wind blade assembly of claim 1, wherein, The spiral vane is provided with a plurality of flow-through holes in communication with the first load-reducing channel.

7. The self-adapting de-loading wind blade assembly of claim 1, wherein, The cylinder wall of the second cylinder is provided with dispersion orifices in communication with the first load-reducing channel and the second load-reducing channel.

8. The self-adapting de-loading wind blade assembly of claim 1, wherein, The adaptive load shedding wind power blade assembly further comprises semiconductor thermoelectric power generation sheets attached to the cylinder wall of the first cylinder, the cylinder wall of the second cylinder, and the cylinder wall of the third cylinder; the semiconductor thermoelectric power generation sheets are used to convert the internal energy generated by the airflow in the first load shedding channel, the second load shedding channel, and the third load shedding channel into electric energy.

9. The self-adapting de-loading wind blade assembly of claim 1, wherein, A plurality of the elastic pendulums are uniformly arranged along the circumference of the second cylinder; And / or, the elastic pendulums are arranged in a hollow structure; And / or, the surface of the elastic pendulums is provided with a plurality of spaced-apart convex rib structures and groove structures, and the convex rib structures and the groove structures are in a wavy shape; And / or, at least one of the elastic pendulums is embedded with a counterweight.

10. A wind power unit, characterized in that The wind turbine generator set comprises the adaptive load shedding wind power blade assembly according to any one of claims 1 to 9.

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