CN220248264U

CN220248264U - Wind driven generator adopting novel flexible feather-shaped blades

Info

Publication number: CN220248264U
Application number: CN202221035633.2U
Authority: CN
Inventors: 郑重胜
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2023-12-26
Anticipated expiration: 2032-04-21

Abstract

The existing rigid blade wind driven generator has low power generation performance in a breeze state, can generate strong wind load in a high wind speed state, has low power generation efficiency, poor grid connection stability, high failure rate and high cost, and seriously hinders the development of the wind power industry in China. The utility model relates to a novel wind driven generator adopting novel flexible feather-shaped blades, which is an intelligent blade designed according to the bionics principle, wherein the flexible feather-shaped blades mainly comprise a main rod with a through length and a plurality of side support rods as frameworks, the main rod and the side support rods deform along with wind speed, so that full load at low wind speed and unloading at high wind speed can be realized, the breeze power generation performance is improved, impact damage caused by high wind speed is avoided, the requirements of the running characteristics of a wind motor are met, and safe and stable running of the wind motor can be ensured. The wind turbine adopting the novel blade has the advantages of simple structure, low cost, low maintenance cost and high breeze power generation performance, can be used in the area with barren wind energy, is also suitable for developing the typhoon-resistant motor, and can promote the large development of the wind power industry.

Description

Wind driven generator adopting novel flexible feather-shaped blades

Technical field:

the utility model relates to a novel wind driven generator adopting novel flexible feather blades.

The existing wind power generation technology is introduced from Europe, a high-wind-speed wind motor is developed by marine climate, needle-type blades are designed according to the aerodynamic principle of aircraft wings, low-wind-speed aerodynamic force is weak, power generation efficiency is low, high-wind-speed aerodynamic force is strong, impact damage to the wind motor can be caused, failure rate is high, cost is high and the like, and the wind power industry needs to be complemented and supported, so that the development of the wind power industry is influenced.

The novel flexible feather-shaped blade is adopted in the wind power generation device, the flexible feather-shaped blade can correspondingly change the profile of the wind according to the change of the wind speed, the larger the wind is, the larger the bending deformation of the blade is, the wind area is greatly reduced, the wind load of the blade is greatly reduced, the impact damage of high wind speed to the wind turbine is avoided, the wind turbine is not overloaded at overspeed, the full load at low wind speed can be realized, the unloading at high wind speed can be realized, the characteristic requirement of a wind motor is more met, the breeze power generation performance can be greatly improved, and the safe and stable operation of the wind turbine can be ensured.

The high wind speed unloading function of the flexible blade is very suitable for developing an anti-typhoon motor on the coast, and a large amount of wind energy on the coast is changed into clean wind power, so that the high wind speed unloading function has great significance for energy conservation and emission reduction. The good breeze power generation performance can also meet the conditions of uneven enrichment and depletion of wind energy resources in various places in China, can be popularized and used in areas with insufficient inland wind resources, and can make great contribution to developing new wind power energy in China.

The background technology is as follows:

wind power technology has been developed for nearly a hundred years, but the application of wind power generators is not popular, and the root cause of the wind power generation technology is low in power generation efficiency and high in maintenance cost. Wind energy is cheap, but wind power is expensive, and only if the situation is changed, the wind power can promote a large number of applications of the wind inlet motor.

The small-sized wind driven generator industry in China starts from the 70 s, and 100W, 150W, 200W, 300W, 500W, 1kW, 2kW, 3kW, 5kW, 10kW and 20kW units are available for the small-sized wind driven generator. The application areas of the small wind driven generator comprise agricultural areas, pasture areas, frontier defense teams, sentry posts, island armies, inland lake fishermen, microwave stations at high mountains in the field, navigation lights, television differential stations, weather stations, forests, and the like, and the application range of the small wind driven generator is also quite large. In recent years, along with the emphasis of the national development of new energy, the novel wind power generation system has more application in street lamp illumination of cities, but has low power generation efficiency, high failure rate and lack of maintenance of wind power generators, thereby seriously affecting the large-scale popularization and application of small wind power generators.

Existing high wind speed wind turbine blades employ propeller rigid blades, so-called aerofoil blades. The small wind driven generator adopts the propeller needle type blade for two main reasons, one is that the propeller rigid blade has stall characteristic, namely the rotating speed of the wind wheel can not be increased along with the wind speed after the blade stalls, and the rotating speed is kept constant, so that the overload of the wind driven generator can be avoided; the other reason is that because the tip speed ratio is large, which means that the rotating speed of the wind turbine is high, and the wind energy utilization coefficient is high, on one hand, the speed increasing ratio of the gearbox can be reduced, the cost can be reduced, the gearbox can be even omitted, and the high rotating speed can also improve the efficiency of the generator. The propeller blades are very necessary for the large wind driven generator, because the blades are long, the blade tips have high linear speed, the aerodynamic performance of the blades can be exerted, the large wind motor can reach M W level, the blades and the control system are designed according to the blade and blade angle control device of the helicopter, mainly, the adjustability of the blades is utilized to control the windward attack angle of the blades, the rotating speed of the impeller is controlled, the stability of power output is maintained, the constant speed and constant frequency of the generator are ensured, the technical requirement of grid connection is met, and the manufacturing cost of the large generator set is very high.

These advantages of propeller blades meet the requirements of wind generators for overload avoidance and wind wheel rotational speed control, but also result in waste of wind energy. Stall blades and pitch blades are characterized by narrow strips, and although designed according to aerodynamic principles, aerodynamic performance is certainly weaker at low wind speeds and low rotational speeds. The blade is like a wing of an airplane, not a wind blows the blade, but the thrust is formed by the pressure difference formed by blowing the wind over the surface of the blade, the aerodynamic performance is weak certainly in a low wind speed state, as the airplane has low speed and no lift force, the land three-four-stage wind is the most common wind speed and the most valuable wind speed, but the existing blade has weak aerodynamic performance at the wind speed and inevitably causes low power generation efficiency.

According to the problems existing in the prior wind power technology, in order to solve the problem of low breeze power generation performance, the performance of the blade is required to be changed, the blade with aerodynamic performance cannot be adopted any more, the windward area of the blade is increased, the wind resistance performance blade is similar to that of a bird, the area of the wing is used for capturing aerodynamic force, the flapping speed of the wing is not fast, but larger lifting force can be obtained, the lift-off and fast flying of the bird are ensured, the shape of the wing can be changed, the windward area of the wing is changed, and the flying of the bird cannot be influenced no matter whether the wind is large or small. The wind power generation device has the advantages that the structural characteristics of the feathers are analyzed according to the bionics principle, the flexible feather-shaped blades are designed, the maximum wind energy is obtained through the maximum wind receiving area under the condition of low wind speed, the wind receiving area is reduced through deformation under the condition of high wind speed, the wind load is reduced, the rotating speed is reduced, the damage of typhoons and high wind to a wind motor can be avoided, and the damage of the wind motor to the motor and an electronic device due to the overspeed can also be avoided. Therefore, the novel flexible feather blade can fully utilize low-wind-speed wind energy, and the breeze power generation performance of the wind turbine is greatly improved. The wind resistance blade has the advantages that the wind resistance blade is made into various blades with different sizes for research, good effects are obtained through experiments for many years, the wind can rotate quickly in the normal second level and third level, the wind resistance blade is greatly improved in breeze power generation performance compared with the existing rigid blade, the generated energy is greatly increased, but experiments find that the wind resistance blade cannot be too long, when the wind resistance blade is more than 2 meters, the rotating speed of the blade is rather slow, the reason is that the blade is long, the linear speed of the blade tip is increased, the wind resistance is greatly increased, the rotating speed of the impeller is greatly reduced, part of energy is consumed by wind resistance, and the wind energy acquisition efficiency is influenced. Therefore, the length of the wind resistance blade is not more than 2 meters, the wind resistance blade can only be applied to a small-sized wind motor, and the technology of the existing small-sized wind motor is simply introduced below.

The existing wind motors are all upwind wind type wind power generators, the generators are transversely arranged, impellers of the upwind type wind power generators are arranged at the front parts of the generators, and the impellers face incoming wind. The impeller of the downwind type wind driven generator is arranged at the rear part of the generator, the incoming wind is blown from the back of the impeller, and the downwind type wind driven generator has little application.

The existing small upwind type wind turbine blade is arranged at the front part of a wind motor, the tail part of the wind motor is a wind rudder, the lower part of the wind motor is a steering shaft, the wind turbine blade is arranged on a bracket, the tail rudder is a dovetail-shaped flat plate, and the tail rudder swings left and right under the action of wind force to be consistent with the direction of wind, so that the wind wheel is always guaranteed to face the windward direction. Most of small wind turbines have no pitch device, some wind turbines with larger power have simple mechanical pitch devices, and rigid blades are easy to be impacted and damaged under the condition of high wind speed. The blades of the small wind motor are designed according to the aerodynamic principle, and belong to high wind speed blades, needle structures, small wind area and low breeze power generation performance. Because the small-sized wind turbine has low power generation efficiency and high maintenance cost, the universal use of the wind turbine on land is seriously affected. The land does not lack wind energy, but lacks a breeze high-efficiency novel wind motor with high power generation efficiency.

The performance of the wind motor is described by technical data of some wind motors, and according to experimental data of 50 watt street lamp wind driven generator of inner Mongolian university, how does the performance of the existing wind driven generator? The power of the wind motor is 50 watts, the design wind speed is 10 meters/second, the power output characteristic data (1.25 times of chord length) of a special three-blade wind wheel with 50W is selected, and the aerodynamic performance of the blade is the best from experimental data; the method comprises the steps that a group of data are taken, the average output power of a wind motor is 9.282 watts at an average wind speed of 6.5 meters/second, the wind speed of 6.5 meters/second is equal to 4-level wind, namely, the wind motor can only achieve 20% of generated energy at the common wind speed, and the power generation efficiency is relatively low; and when the average output power of the wind turbine reaches 48.506 watts, the average wind speed is 15.5 m/s, the wind speed is equivalent to 7-level strong wind, the strong wind is rare in northwest and coastal, and the strong wind becomes a sand storm in northwest, so that the wind turbine is difficult to reach full load. Experimental data of the inner Mongolian industrial university show that the power generation efficiency of the existing common three-blade wind motor is low, and also show that the theoretical calculation data of the wind motor is quite different from the actual application data. How to increase the power generation efficiency of a wind turbine is a problem that we have to consider? In particular, how to improve the power generation efficiency of the three-four-stage wind is an important issue that we have to consider.

How does our wind turbine become smaller? This problem is what we have to face, as the global environment warms, the wind gets smaller and the frequency of the high wind gets smaller, which we can feel significantly. Advanced engineers Jiang in the national climate center have started earlier wind farm surveys in China such as Huitengxi and the like, and electric field staff have visual feelings on wind attenuation. Jiang the year-by-year reduction of weather events such as chill, sand storm, temperate zone cyclone, etc. is also evidence of the reduction of wind speed, except for the history record left by the anemometer. In this study Jiang found an interesting phenomenon that in inland areas where wind energy resources were relatively scarce, the windless days were reduced and the wind speeds were inversely increased between 4 m/s and 8 m/s. How to develop a breeze type wind motor suitable for land use is a current urgent problem to be solved? Only if the problem is solved, the rapid development of the wind power industry in China can be ensured. With the expansion of the landing land installed capacity, the problem of low breeze power generation performance is more and more prominent, the improvement of breeze power generation performance is already known by people, and people want to improve the breeze power generation performance on the basis of the existing blades, so that the effect is good but not obvious. Because the existing blades are designed based on aerodynamic performance, the aerodynamic performance must be weak at low wind speeds and how does it improve the output of wind energy? Therefore, the main way of improving the breeze power generation performance is to change the blade structure and improve the structural power performance.

The utility model comprises the following steps:

the low breeze power generation performance of the existing wind motor is an urgent problem to be solved, and 3-4-level wind is longest in the whole year from the view of the distribution time of land wind energy, but the existing wind turbine generator is low in power generation efficiency under the condition of wind speed, and the waste of wind energy resources is seriously caused. The blades are the souls of the wind motor, the performance of the blades is directly related to the performance of the wind motor, the efficiency of obtaining wind energy is related, the breeze power generation performance is improved, the stability and the safety are improved, the cost is reduced, and the wind power generation performance is improved from the performance of the blades, and the span of the wind power technology can be realized only by developing novel blades.

The nature is always the best teacher, the wings of the birds are efficient wind energy utilization devices, the birds can fly fast or slowly, and the wings of the birds can be flexibly controlled. The front end of the bird wing is provided with tendons, bones, skin, meat and feathers, the section of the bird wing is streamline, the bird wing has good aerodynamic performance, and the bird wing can glide at a high speed without fanning the wing. The bird wings have larger wind catching area, and the bird can be immediately accelerated under the condition of stopping by fanning the wings, so that the bird is pushed to fly quickly, and the bird generates power under the low-speed state by the large wind catching area. The structure of the blade must be changed to improve the breeze power generation performance of the wind driven generator, and the structure power performance is improved like the wings of birds. The kite can fly like wind, and the lift force is generated by the wind area of the structure instead of the aerodynamic performance of the structure; this problem can also be illustrated by taking the example of wings of birds, which are wide and large on land, and narrow and long on seaside.

The aerodynamic properties of the blade are weak in breeze conditions, while the structural dynamic properties are active. The existing blade is shaped like a salix leaf, two ends are small, the middle is large, the wind-receiving surface is long and narrow, and the wind-receiving area of the blade only accounts for about five percent of the wind-sweeping area of the blade; the tip of the blade is farthest from the axis, the wind moment is also maximum, but the windward area of the blade tip is minimum, so the structural power performance of the blade is also not ideal.

The magnitude of the wind force exerted on the object is proportional to the area of the object, and the larger the area is, the larger the wind force exerted on the object is, and in order to improve the breeze starting performance of the blade, the wind-receiving area of the blade must be increased.

According to the calculation formula of wind energy:

E＝PAVw ³

wherein: e-energy of wind A-area Vw-wind speed P-air Density

How does the blade catch improve performance? How does the cost of the blade be reduced? This is the direction of improved blade performance development. Light feathers are the best research object, and the feathers are simple and light in structure and have good wind capturing performance. The middle part of the feather is provided with a feather shaft, the side surfaces of the feather shaft are closely provided with a fine feather flap, the fine feather flaps are connected together through feather wires, the inside of the feather shaft and the inside of the feather flap are hollow, the weight is very light, the strength is very good, and the wind catching area is very large. The feather is structurally simplified according to the bionics principle, the structural performance characteristics are highlighted, and the feather-shaped blade suitable for the power generation device is designed. The feather-shaped blade takes a main rod with a through length and a plurality of side support rods as a framework, the main rod with the through length is equivalent to a feather shaft of the feather, the side support rods are equivalent to feather petals, and the blade surface adopts canvas to be equivalent to feather wires, so that the wind catching effect is achieved. The shape of the blade surface is similar to a feather shape, but is different from the shape of the feather, the feather is narrow in tip part and wide in root part, the blade is wide in tip part and wide in tip part, larger wind power can be obtained when the wind area is large, the tip part is far away from the axis, larger wind moment is generated, and larger wind energy is obtained.

The novel blade is mainly characterized in that: the long strip-shaped feather-shaped canvas with the wide tip and the narrow root is fixed on the main rod and the side support rods, one side of the canvas is fixed on the main rod, the other side of the canvas is connected and fixed at the outer end parts of the side support rods, and the canvas forms a feather-shaped blade with a feather shape under the supporting action of the main rod and the side support rods, and the main rod and the side support rods have good strength and elasticity. The main rod plays a role in fixing canvas and transmitting moment, and the canvas and the side support rods play a role in catching wind. The structure can ensure the strength of the blade, ensure the wind catching performance of the blade, ensure the large wind area of the blade, and greatly reduce the cost of the blade, so the flexible feather-shaped blade has good cost performance. Compared with the existing blade, the wind-receiving area of the blade can be increased by 2-3 times, the structural power performance of the blade can be greatly improved, the power of the wind motor is in direct proportion to the wind-receiving area of the blade according to the formula, the breeze power generation performance of the wind motor is inevitably increased by times, and particularly the generated energy of the wind speed interval of 3-8 m/s can be greatly improved. The improvement of breeze power generation performance not only improves annual generating capacity, but also mainly increases generating capacity in the low-wind season, and can ensure that wind power output exists in most of the whole year, which is very important for utilizing and using wind power.

The blade not only has the function of acquiring wind energy, but also has the function of adjusting power, and after exceeding the rated wind speed (generally 12-16 m/s), the wind generating set must reduce the energy capture of the wind energy due to the limitation of mechanical strength, physical properties such as generator, power electronic capacity and the like, so that the power output still keeps near the rated value.

The flexible feather-shaped blade has a power adjusting function, can realize full load at low wind speed and unloading at high wind speed, and meets the characteristic requirements of a wind motor better. The stress rod piece of the flexible feather-shaped blade is a main rod and a side support rod, the main rod and the side support rod deform to different degrees under the action of different wind forces, and the size of the deformation determines the size of the wind area of the blade, namely the size of the wind load. When the wind force increases, mainly the side support rod is deformed, the sail surface pulls the side support rod to deform backwards under the action of wind force, the wind area of the blade can be reduced, the windward angle of the blade can be reduced, and the wind load is reduced. The larger the wind is, the larger the deformation of the side support rod is, the larger the wind load is reduced, the impeller cannot be increased along with the increase of the wind speed, the rotation speed is basically kept stable, and the stable operation of the wind motor is ensured. When wind power is great, the mobile jib also takes place to warp, and the arc of mobile jib can be along with the increase of wind-force and crooked bigger, and the chord length of arc can shorten, and the outside sail face that originally stretches up can become very loose, will reduce the wind capturing performance of sail face by a wide margin, reduces the blade wind load by a wide margin, and the impeller rotational speed is faster, and the windage of blade is also bigger, and the rotational speed of impeller is not increasing when wind load and windage reach equilibrium, can prevent that the wind turbine from transshipping, can guarantee the stability and the safety of wind turbine operation.

The flexible blade is adopted to innovate the prior art, in the prior art, the small wind driven generator adopts a front upwind structure, and as the blade is at the front end of the wind driven generator, the blade is deformed backwards under the action of wind force and can touch the wind driven generator bracket, and therefore, the flexible blade is required to be adopted to adopt a downwind structure. The downwind structural blades are positioned at the rear of the generator, the blades deform backwards under the action of wind force, the running of the wind motor cannot be influenced, and the requirement of great deformation of the blades can be completely met. Therefore, the wind power generation device adopts a structure with rear blades and downwind, the blades are positioned at the rear of the generator and the bracket rotating shaft, the wind wheel blades are inclined backwards by more than 10 degrees by taking the axle center as a fixed point, conical surface arrangement is formed, the conical wind wheel is like a horizontally-arranged badminton, when the wind wheel blades are acted by wind force, the tip of the wind wheel cone always faces the direction of wind blowing under the action of the tension of the bracket shaft, and the wind wheel cone is like a badminton, so that the requirement of automatically adjusting the windward side of the wind power generator is realized, and the maximum wind energy is obtained. The rotation of the impeller is driven by the blades, the blades and wind have windward angles, the blade surfaces and the axis of the wind power machine have an inclined angle, the wind power received by the blade surfaces can generate rotation moment on the wind power machine shaft, the wind power machine shaft can be driven to rotate, wind energy is converted into mechanical energy, and the generator converts the mechanical energy into electric energy.

The conical wind wheel can realize automatic wind alignment, only axial tension in the horizontal direction is available, no additional moment in the horizontal direction is available, the stress of the wind motor is balanced, vibration caused by unbalanced stress is avoided, and fatigue damage of vibration to the wind motor is avoided. The structure only generates gyro moment when the rotating speed is higher, and the gyro moment has some resistance to direction adjustment, but can slow down the speed of direction adjustment, prevent the wind turbine from swinging too fast and has good effect on the stable running of the wind turbine.

Description of the drawings:

the utility model will be further described with reference to the drawings and examples.

FIG. 1 is a front view of a flexible feathered four blade wind turbine.

FIG. 2 is a view in the B direction of FIG. 1

Fig. 3 is a construction view of the flexible feathered blade.

Fig. 4 is a cross-sectional view of fig. 1 (A-A).

FIG. 5 is a cross-sectional view (A-A) of the flexible feathered blade after deformation by wind load.

In the figure, 1, feather blades, 2, a generator, 3, a rotating shaft, 4, a bracket, 5, an elastic steel wire, 6, a canvas fixing clip, 7, a screw, 8, a main rod, 9, an end fixing piece, 10, a short support rod, 11, a fixing piece, 12, a canvas surface, 13, a long support rod, 14 and a safety device connecting point.

Detailed Description

Fig. 3 is a plan view of a novel feathered blade. The appearance of the blade is seen from the figure to be like a feather, the blade mainly comprises a main rod (8), supporting rods (10) (13) and a canvas surface (12), the main rod (8) extends to the upper end part of the blade in a through length mode, the main rod is a main stressed rod piece of the blade, the main rod has good strength and elasticity, and the root part of the main rod (8) is connected to a generator shaft to play a role in transmitting moment. The side support rods (10) and (13) are fixedly connected to one side of the main rod (8), the functions of the side support rods (10) and (13) are very important, and the wind capturing function of the blade is realized by supporting the canvas surface (12) by the side support rods (10) and (13). The canvas surface (12) is adhered by wrapping edges near one side of the main rod, an elastic steel wire (4) is penetrated in the middle of the wrapping edges, the canvas surface (12) is connected to the main rod (8) through a canvas fixing clamp (6), the edges of the canvas surface (12) on the other side are adhered in a double-layer manner, the strength of the edges of blades is improved, two points of the canvas surface (12) are connected to the side support rods (10) and (13) through fixing sheets (11) and (14), the root of the canvas surface (12) is fixed to an end fixing piece (9), the side support rods (10) and (13) support the canvas surface (12), and the canvas surface (12) is unfolded into a feather-shaped leaf surface.

The upper end part of the blade is wider, the windward area of the upper end part is large, large wind torque can be generated, the main rod (8) can be made of glass fiber reinforced plastics, and the main rod has good strength and flexibility and can deform under the action of wind force. The side support rods (10) and (13) are thin round rods seen in the figure, and can also be made of glass fiber reinforced plastic, so that the side support rods (13) and (10) are bent backwards under the action of wind force, the leaf surfaces are displaced backwards, the wind area of the blades is reduced, the effect of reducing wind load can be achieved, the condition that the impeller is faster and faster along with the increase of wind speed is avoided, and damage caused by high wind speed overload is avoided.

By utilizing the structural characteristics of the blades, the power regulation function is realized, and the blades can realize the power output control function under four different wind speed states by controlling the deformation of the main rod (8) and the side support rods (13) (10).

Firstly, the maximum windward area from breeze to strong wind (2.5-8 m/s) can be realized, when the wind speed is low, the deformation of the main rod (8) and the side support rods (13) (10) is small, as shown in the sectional view of the initial state of the blade in fig. 4, the windward angle of the blade at the initial position is maximum X1, the windward area width of the blade is maximum L1, the wind can rotate, the blade is in the maximum windward area, and the breeze power generation performance is improved.

Secondly, controlling stable output of power from strong wind to strong wind (8-13 m/s), and ensuring stable output power when the wind is in a higher full-load wind speed state. At this time, the main rod (8) is not deformed much, the side support rods (13) (10) are deformed backward along with the increase of wind speed, and fig. 4 is a sectional view of the initial position of the blade, wherein the windward angle is +.x1, and the side support rods (13) are not deformed. Fig. 5 is a backward bending deformation section view of a rear side supporting rod (13) of a blade subjected to wind force, the side supporting rod (13) deforms under the action of the tensile force of a canvas (12), the backward displacement length is b, the windward angle of the blade is changed from an angle X1 value to an angle X2 value, the width of the windward area is changed from L1 to L2, the windward angle is reduced, the windward area of the blade is reduced, and therefore, the windward angle and the windward area of the blade are reduced along with the increase of the wind speed, the windward load of the blade is kept in a basically stable range, and the impeller rotating speed is not increased along with the increase of the wind speed, so that the basically stable operation of the rotating speed and the power of the wind power generator is ensured.

Thirdly, the power increase output is limited under the condition of controlling the strong wind (13-20 m/s), and when the strong wind is in a strong wind state, the wind load of the blades is greatly reduced, so that the safety of the wind motor is ensured. At the moment, the main rod (8) and the side supporting rods (13) (10) are deformed backwards, the elastic steel wires (5) at the top of the blade tip are also deformed greatly, the outer edge of the canvas (12) is loosened, the wind capturing performance of the blade is greatly reduced, the wind load of the blade is also greatly reduced, the wind resistance of the blade is increased, the rotating speed of the impeller is not increased, the rotating speed of the impeller is reduced, the output power of the wind turbine is also reduced, the overload of the wind turbine is not caused, and the safe operation of the wind turbine can be ensured.

Fourthly, the wind motor is prevented from being damaged under the condition of damaging the typhoons of the level, typhoons of more than ten levels in coastal areas can be generated every year, the damage force of the typhoons is large, and the blades are quite necessary to be completely unloaded in order to ensure the safety of the generator set and the tower. The safety device (14) is additionally arranged on the connection point of the side supporting rod (13) and the canvas (12), when the stage wind is damaged, the safety device (14) on the connection point can be automatically detached, the canvas (12) is detached from the side supporting rod (13), the outer edge of the canvas (12) is in a free state, the blades lose the wind capturing function, the wind load borne by the wind turbine is greatly reduced, and the safety of the wind turbine is ensured.

As shown in FIG. 1, the wind turbine adopts a downwind structure, the conical impeller is arranged at the rear of the wind turbine, and the conical impeller automatically faces wind, so that the structure is simple and the wind is accurate. Fig. 1 and 2 intuitively show three components of the novel wind motor, (1) the feather blades, (2) the generator, (3) the rotating shaft and (4) the bracket. In fig. 1, the feather blades (1) are arranged behind the generator (2) in a conical shape, when receiving wind force, the impellers are always positioned behind the rotating shaft (3) under the action of the pulling force of the rotating shaft (3), and accurately align with the direction of the incoming wind. Because the wind area of the feather-shaped blades is larger, each blade can generate larger wind moment, and in order to balance the stress of the generator shaft, the blades are symmetrically arranged in an even number. The device is symmetrically installed by adopting four blades.

From the aspect of wind capturing performance, the canvas structure has the advantages of simple structure, low cost, large wind capturing area and the like. Therefore, the breeze power generation efficiency of the wind motor is improved, the structural power performance of the impeller is improved by adopting a sail surface structure, and the canvas material is selected from materials with good strength and ageing resistance. Under the blowing of high-speed wind, the blade can produce stronger turbulent flow phenomenon at the outside edge of canvas, causes the violent vibration at canvas edge, easily makes the canvas edge produce wearing and tearing and ageing, in order to reduce the influence of turbulent flow, can install the wave shirt rim additional at the canvas outside edge.

The advantages of the flexible feathered blades are summarized below: i.e. full load at low wind speeds and unloaded at high wind speeds. The variable load process of the flexible blade corresponds to the wind power, the profile of the wind can be correspondingly changed according to the change of the wind speed, and the flexible blade is an intelligent blade, so that the intelligent adjusting process of the flexible blade meets the requirements of wind load characteristics of a wind turbine. The wind load characteristic is realized by the stress type of the self structure of the blade, hysteresis and mechanical and electronic faults are avoided, and the wind load characteristic is simpler and more reliable. The flexible blades can also dissolve the impact energy of gusts, so that the rotating speed of the wind motor is more stable. The flexible blade can also avoid vibration caused by blade turbulence and gust fluctuation to the wind turbine, so that fatigue damage can be reduced, and the service life of the wind turbine is prolonged. The requirements of the flexible blade on rigidity are greatly reduced, the used high-strength materials are also greatly reduced, the manufacturing difficulty is also greatly reduced, and the manufacturing cost of the blade can be greatly reduced. Therefore, the flexible blade has very remarkable effects of greatly improving breeze power generation performance, greatly improving the generated energy, ensuring the stable operation of the wind motor and reducing the cost of the wind motor, and the advantages can also enable the flexible blade to become a development direction in the future.

The flexible feather-shaped blade has the great significance of developing a novel typhoon-resistant motor, the flexible blade can be greatly deformed along with wind speed, the flexible blade can be rapidly unloaded, impact damage of high wind is avoided, the high wind speed unloading function of the blade can be used for developing the novel typhoon-resistant motor, the breeze power generation performance of the wind motor can be improved, the wind driven generator can be prevented from being damaged by typhoon, and the flexible feather-shaped blade has great significance for developing coastal wind power resources. The investment cost is greatly reduced, the generated energy is greatly increased, the wind power profit drives the investment enthusiasm of the whole society, a large amount of clean wind power can be used nearby in coastal economic developed areas, the significance for energy conservation and emission reduction is great, and the great development of the wind power industry can be promoted.

Claims

1. A wind power generation device adopting novel flexible feather-shaped blades comprises a generator, a bracket and a blade wind wheel, wherein the wind wheel is positioned behind the generator and the bracket; the wind wheel is characterized in that the wind wheel adopts flexible feather blades, the flexible feather blades are inclined backwards by more than 10 degrees by taking the axle center as a fixed point, so that conical surface arrangement is formed, the conical surface of the conical wind wheel always faces the direction of incoming wind under the action of wind force and the tension force of a support shaft, and the requirement of wind power device on wind direction adjustment can be stably and accurately met; the blade surfaces of the wind wheel blades and the axis of the wind turbine have a windward included angle, wind power received by the blade surfaces can generate a rotating moment on the axis of the wind turbine, the wind turbine is driven to rotate, wind energy is converted into mechanical energy, and then the mechanical energy is converted into electric energy by the generator.

2. The wind power generation device adopting the novel flexible feather-shaped blade according to claim 1 is characterized in that the flexible feather-shaped blade mainly comprises a main rod, side support rods and canvas, the main rod and the side support rods form a skeleton of the feather-shaped blade, one end of the main rod is connected and fixed on a main shaft of a wind motor, the main rod plays the roles of transmitting moment and fixing blade surfaces, the main rod is of a through length, the other end of the main rod extends to the upper end part of the blade, a plurality of side support rods are fixedly arranged on one side of the main rod, the main rod and the side support rods are rod pieces with good strength and elasticity, and the number and the elastic strength of the side support rods can be determined according to the size and wind load requirements of the blade; the blade surface is strip-shaped irregular blade-like canvas, the canvas is made of a material with good strength and aging resistance, one long side of the blade surface is connected to the main rod, the other side of the blade surface is provided with a plurality of fixed points which are connected to the outer end parts of the side supporting rods, and the blade surface forms a blade with a blade shape under the supporting action of the main rod and the side supporting rods; the side support rods support the leaf surfaces to capture wind, and after the blades are subjected to wind force, the main rod and the support rods elastically deform along with the wind speed, so that the full load of the blades at low wind speed and the unloading at high wind speed can be realized.

3. The wind power generation device adopting the novel flexible feather-shaped blades according to claim 2, wherein in order to ensure the complete unloading of the blades at destructive wind speeds and ensure the safety of a wind motor, a safety device is arranged on the connection point of the canvas and the side support rods, when the wind speed reaches more than ten levels, the safety device of the connection point of the canvas exceeds the strength limit and is automatically detached, the canvas is detached from the side support rods, the outer edge of the canvas is in a free state, the wind capturing function is lost, and the complete unloading of the blades is realized.