WO2008092331A1

WO2008092331A1 - A movable blade antidrag type aerovane windmill generator

Info

Publication number: WO2008092331A1
Application number: PCT/CN2007/003549
Authority: WO
Inventors: Shaozhong Liu
Original assignee: Shaozhong Liu
Priority date: 2007-01-25
Filing date: 2007-12-12
Publication date: 2008-08-07
Also published as: CN101008376A

Abstract

A movable blade antidrag type aerovane windmill generator includes a nacelle (6) which has a generator (4) and a controlling device (5) and a blade driving assembly (1) on the top of the nacelle (6). The blade driving assembly (1) includes a wind wheel and a wind wheel central shaft (20) which is a vertical shaft. The wind wheel has several airfoil shaped blades (23) assembled on the wind wheel central shaft frames (22). The airfoil shaped blades (23) are wind-receiving slots in the wind wheel rotating direction, whose front ends are smaller than the ends whose surfaces have wind-receiving notches. The airfoil shaped blades (23) include blade bodies (11), actived blades (13) under the blade bodies (11) and baffles which are fixed on the blade bodies (11), used to separate the actived blades (13) and limit active region of the actived blades (13). The actived blades (13) which are rotatablely connected with the blade bodies (11), the baffles and the blade bodies (11) form the actived wind-receiving slots. The application enhances efficiently wind energy efficiency of the blade driving assembly (1), is adapted to produce large and super large windmill generators, and has advantages such as good strength resistance capacity, no-noise, easy-assembly and low cost of manufacturing.

Description

Flying leaf drag reducing rotary wing wind turbine

The invention relates to a wind power generator set, in particular to a live blade which can generate large power and can reduce the automatic 4 bar resistance when the wind wheel rotates, and can generate power when the wind is 2 to 12 winds. Resistive rotary wing wind turbine. Background technique

Wind power generation has a history of more than 150 years. After analyzing the atmospheric circulation model, scientists found that the wind energy contained in the low-level convective air mass is very huge, and it is inexhaustible and useful for human beings. One of the exhaustive energy sources, therefore, in the case of the escalating energy crisis facing human beings, the research on wind power generation has become more and more significant and far-reaching. In some developed countries, such as the United States, the Netherlands, Denmark, France, Germany, and Italy, wind power has played a pivotal role in its domestic power structure. There are only a few regions in China, such as Xinjiang Dabancheng, Guangdong Nan'ao Island and Shanwei Red Bay, Fujian Dongzhou Island, etc., relying on imported equipment, the total installed capacity is less than 700,000 KW, the proportion of power structure in China. Less than 1%.

In the prior art, the driving mechanism of the existing wind turbine generator, the blade drive assembly, usually adopts a two- or three-bladed propeller blade structure, and the disadvantages are:

(1) Its wind energy efficiency is low: Because the wind turbine has less wind receiving efficiency, the output torque is small, that is, the utilization of wind energy is low, and the wind energy efficiency of the two-leaf wind wheel is only 13 - 18 %, The wind energy efficiency of the leaf wind wheel is only 21 ~ 24%; (2) Wind turbines must generate electricity above level 4 to generate electricity. Low and low winds cannot be used. Therefore, wind turbines must be built in places with sufficient wind power, which brings limitations to the widespread promotion of wind turbines;

(3) The weight of the blade is heavy and the process requirements are complicated: In order to improve the wind energy efficiency of the wind wheel, the method of lengthening the length of the blade is usually adopted, and the high-power wind turbine has a length of 50 to 70 meters.

(4) The wind blade has poor resistance to strong strength, and when the strong wind is abrupt, it is easy to break the blade;

(5) The noise is too loud to be too close to the living area;

(6) A yaw device is required to track the wind direction, and the minicomputer relies on the tail rudder to track the direction; (7) a cable unwinding device is required;

(8) Must be used in parallel with the grid.

(9) The defects of the aforementioned blades greatly increase the cost of manufacturing, transportation and installation, making the cost of the wind wheel high.

In addition, most of the wind turbines actually used are horizontal-axis propeller wind blade wind turbines, that is, the blade drive assembly adopts a horizontal axis structure, the central axis of the wind wheel is horizontal, and there are about 15 between the central axis and the horizontal plane. The elevation angle of the degree, placed horizontally, the blade is fixed on a vertical elevation at the front end of the horizontal shaft. The disadvantages are:

(1) Wind energy cannot be used in all directions: The wind in nature may blow from any direction, since the blades of the horizontal axis wind wheel are only located on a vertical sweeping surface, which causes the wind flow to be different from the angle of the sweeping surface. The wind energy efficiency will be different. The wind flow is most efficient for the wind sweeping surface, and the wind energy efficiency is the smallest when the wind flow is parallel to the sweeping surface;

(2) The horizontal axis structure is such that the wind turbine must have a supporting blade drive The support tower of the assembly, the tower height must be higher than the length of the blade, and reach the minimum safe height. Since the length of the high-power blade can reach several tens of meters, the tower height is generally as high as tens of meters or even hundreds of meters. The support tower must support the tower drive assembly of the tower collar firmly and steadily, so the tower must have a good structural design and high enough strength;

(3) The aforementioned drawbacks lead to high overall cost of wind turbines.

Some vertical axis wind turbine technologies have been disclosed in the prior art, that is, the blade drive assembly adopts a vertical axis structure, and the central axis of the wind wheel is a vertical vertical axis, but is usually applied to a medium and small power wind power generator. The target, the blade structure of the wind wheel is somewhat improved, but it is still improved with a small number of blades as the cornerstone, so the wind energy efficiency is still not ideal. Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to provide a flap-reducing type of rotor-type wind turbine generator capable of effectively solving the above-mentioned deficiencies of the existing wind turbine generators, and efficiently utilizing wind energy to generate huge power and improve wind energy efficiency.

In order to achieve the above object, the present invention provides a flap reduction type rotary wing type wind power generator comprising a nacelle having a generator and a control device therein, and a blade drive assembly located at an upper portion of the nacelle, the fan blade The driving assembly is composed of a wind wheel and a central shaft of the wind wheel, wherein the central axis of the wind wheel is a vertical vertical axis, and the wind wheel is provided with a plurality of wing-shaped blades mounted on the central shaft frame of the wind wheel, and the wing-shaped blades are along the edge. The front end of the wind wheel rotates in a small rear end and has a large wind receiving groove, and the rear surface is a wind receiving groove.

The wing-shaped blade includes a blade body, a movable blade disposed at a lower portion of the blade body, and an activity fixed to the blade body for separating the movable blade and restricting the movable blade In the range of the partition plate, the movable vane is rotatably connected with the vane body, and forms a movable wind receiving trough with the partition plate and the vane main body. The front end of the wing-shaped blade has a circular arc shape, the upper surface is streamlined, and the lower surface is inclined with the horizontal plane.

In the above technical solution, the upper part of the blade body may be provided with a movable blade which is rotatable along a joint of the movable blade and the blade body, the blade body and the movable blade A spring for the active leaf plate reset is provided between the plates. The rotor wheel of the wind wheel may have an axial flow vane. The edge of the rotor wheel of the wind wheel may be provided with a safety and stability device for stably rotating the central axis of the wind wheel. The safety stabilizing device is provided with a stable steel ball, and a gap is formed between the stable steel ball and the surface of the wind wheel seat plate. The edge of the wind wheel seat of the wind wheel may also be provided with a steady speed braking device that prevents the speed of the wind wheel from exceeding a prescribed speed.

Therefore, the flap reduction type rotary-wing wind turbine of the present invention has the following significant advantages:

1. Effectively improve the wind energy efficiency of the blade drive assembly;

2. The wind turbine starts with small wind, the driving torque is huge, and the moment of inertia is huge;

3. Suitable for large and very large wind turbines;

4. Good anti-strong ability, no noise, convenient process, convenient installation and low manufacturing cost.

The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

DRAWINGS 1 is a schematic structural view of a live-blade drag reduction type rotary-wind turbine generator of the present invention; FIG. 2 is a schematic internal view of a live-blade drag-reducing rotary-wing wind turbine of the present invention;

Figure 3 is a partial cross-sectional view showing the axial line of the movable blade drag reducing type rotary wind turbine of the present invention along the central axis of the wind wheel;

Figure 4 is an enlarged cross-sectional view showing a portion of the wind turbine seat plate shown in Figure 3;

Figure 5 is a cross-sectional view of the flap reduction type rotary-wing wind turbine shown in Figure 3 taken along line H-H;

Figure 6 is a P-direction view of the wind wheel shown in Figure 3;

Figure 7 is a F-direction view of the blade shown in Figure 6;

Figure 8 is an E-direction view of the blade shown in Figure 6;

Figure 9 is a cross-sectional view of the blade shown in Figure 7 taken along the line K-K;

Figure 10 is a partial cross-sectional view of the upper positioning reinforcing portion of the partition plate shown in Figure 9 taken along line A-A;

Figure 11 is a G-direction view of the blade shown in Figure 9;

Figure 12 is a state diagram of each component of the blade shown in Figure 9 (when the wind force is a driving force);

Figure 13 is a state diagram of each component of the blade shown in Figure 9 (when the wind is a resistance); Figure 14 is a partial cross-sectional view of the lower positioning portion of the spacer shown in Figure 13 taken along line BB; Figure 15 is Figure 9. State diagram of the various components of the illustrated blade (the wind is the driving force and the wind suddenly rises);

Figure 16 is a schematic view showing the operation of the wind wheel of the present invention. Description of the reference signs:

1 one blade drive assembly; 2-clutch; 3--speed increaser;

4 one generator; 5--control device; 6--machine

7 - upper stable steel ball; 8- - lower stable steel ball; 9 - - steady speed braking device;

11 a main blade; 12--active leaf; 13-one moving blade;

14—upper positioning of the spacer plus the lower positioning portion of the 15-separator 16--spring;

Strong part

20—wind wheel center shaft; 21--cover; 22-one wind wheel center shaft frame

23-wind blade; 24-upper stabilizer; 25-one wheel seat plate;

26-low stabilizer; 27-one central shaft base; 28- - steady speed brake

29—The middle flange seat.

detailed description

1 and 2 are schematic views of a flap-reducing rotary-wing wind turbine of the present invention, and the flap-reducing rotor-type wind turbine of the present invention includes a blade drive assembly 1, a clutch 2, a speed increaser 3, and a generator. 4. Control device 5, machine-like 6, upper stable steel ball 7, lower stable steel ball 8 and steady speed braking device 9. The connection relationship and function of the clutch 2, the speed increaser 3, the generator 4, the control device 5 and the machine 6 in the present invention are all well-known technologies of the existing wind turbine, and will not be described in detail herein. The main difference between the present invention and the existing wind power generator is the blade drive assembly 1 of the present invention. The blade drive assembly 1 is located at the upper portion of the nacelle 6, and the blade drive assembly 1 is composed of a wind wheel and a wind wheel center shaft 20. . As shown in FIGS. 3 and 6, the wind turbine center shaft 20 is a vertical vertical axis, and the wind wheel includes a cover 21, a wind wheel center yoke 22, a fan blade 23, and a wind wheel seat disk 25. Wherein, the wind turbine central pedestal 11 is fixed with six blades ²³ around the center, and the cover 21 is connected to the center of the wind wheel by screws. The upper part of the yoke 22 is connected to the bottom of the wind wheel central pedestal 22 by bolts. The wind wheel seat plate 25 presses the largest shoulder of the wind wheel central shaft 20 and is connected to the center of the wind wheel by bolts. The shaft 20 and the wind wheel central yoke 22 constitute the entire blade drive assembly 1.

7 to FIG. 14 are schematic views showing the structure of the blade of the present invention. The blade 23 includes a blade body 11 shaped like an airplane wing, a movable blade 13 disposed at a lower portion of the blade body 11, and a blade 13 fixed to the blade body 11. The upper positioning reinforcing portion 14 of the partition for separating the movable vanes and restricting the range of movement of the movable vanes 13 and the lower positioning portion 15 of the partition. As shown in Fig. 9, when the blade 23 is in an unstressed state, the movable blade 13 rotates along the joint of the movable blade 13 and the blade main body 11 by its own weight, and descends to the lower positioning portion 15 of the partition. . As shown in FIG. 12, when the wind blade 23 is subjected to the action of the wind force, the movable blade 13 rotates counterclockwise along the joint of the movable blade 13 and the blade main body 11 until the lower position of the contact plate is contacted. In part 15, the lower positioning portion 15 of the partition serves as a limit to prevent further rotation of the movable vane 13, causing the entire vane 23 to become a wind receiving trough, which is urged by the wind current. As shown in Fig. 13, when the wind blade 23 is subjected to the resistance of the wind force, the movable blade 13 rotates clockwise along the joint of the movable blade 13 and the blade main body 11 until the upper position of the contact plate is strengthened. In part 14, the upper positioning reinforcing portion 14 of the partition serves as a limit to prevent further rotation of the movable vane 13, allowing the wind flow to pass through the upper and lower spaces of the movable vane 13, reducing the resistance of the airflow to the formation of the vane 23.

As shown in FIG. 9, the wing-shaped vane 23 of the present invention has a shape of a wind receiving groove having a small front end and a large rear end, and the front end of the wing-shaped vane 23 has a circular arc shape, the upper surface is streamlined, and the lower surface is The horizontal plane is beveled and the rear surface is the wind receiving slot. In this embodiment, the fan blade The upper surface of 23 is a streamlined chord, which is at an angle of about 15 to the horizontal plane. The front end of the blade 23 has a sloped surface with the rear face, and the angle with the horizontal plane is about 45°. The blade 23 having the above structure can effectively reduce the resistance when the blade 23 rotates, and increase the urging force of the wind current acting on the blade 23, thereby accelerating the rotation speed of the blade 23 and improving the power generation efficiency.

Figure 16 is a schematic view showing the operation of the wind wheel of the present invention. Here, assuming that a horizontal wind is blown toward the wind turbine blades, the driving force of the wind wheel can be divided into four different force zones A, B, C, and D in a quarter circle, where:

(1) Area A is a directly driven wind zone

In the A zone, the airfoil blade 23 of the present invention forms a wind receiving groove as shown in Fig. 126 under the direct action of the wind current, and receives the wind pushing, so that the wind blade 23 follows the wind wheel central axis 20. Rotate in the hour hand direction.

(2) Zone B is a wind zone driven by weak airflow and eddy current assisted

When the blade 23 is turned to the B zone, due to the interval between the blades, there is a wind that is weaker than the zone A and continues to push the blade 23, and at the same time, due to the groove structure of the blade 23, the wind is made again. A vortex is generated around the outside of the blade 23 and around the blade 23, and this vortex acts as an auxiliary push for the blade 23 in the zone B.

(3) Area C is ^[氐 resistance zone

When the blade 23 is turned to the C zone, the rotation is continued mainly by the action of the inertial force. As the angle of rotation increases, the blade 23 is gradually subjected to the resistance, and as the resistance increases, it is equivalent to the movable blade of the blade 23. 13-thrust, the thrust is increased, and the tail of the movable blade 13 is lifted up until it contacts the upper positioning reinforcing portion 14 of the partition. When approaching the D zone, the movable blade 13 is almost placed in a horizontal position and contacts the upper positioning reinforcing portion of the partition plate. 14. As shown in Fig. 13, the relative airflow passes through the upper and lower spaces of the movable vane 13, and the resistance is greatly reduced.

(4) Zone D is the windward drag reduction zone

When the blade 23 is turned to the D zone, the blade 23 is reversely facing the wind, and the movable blade 13 is almost placed in a horizontal position, and contacts the upper positioning reinforcing portion 14 of the partition, as shown in FIG. The airflow passes through the upper and lower spaces of the movable vane 13 and the resistance is minimized. As the angle of rotation increases, the resistance gradually decreases. When the blade 23 approaches the A zone, the movable blade 13 slowly descends to the normal state under the action of its own weight, contacting the lower positioning portion 15 of the partition.

(5) Large-scale wind blade tail section also has drag reduction effect in Zone A

In the wind turbine structure of the large wind turbine with the above structure, since the length of the wing-shaped blade is long, as shown in Fig. 16, when the rotational speed of the wind turbine is high, the tail of the fourth segment of the blade in the A zone is A large linear velocity will occur, and the linear velocity of the segment will be higher than the driving wind speed, so that the relative resistance of the segment will be generated, and the relative resistance will also lift the movable blade 13, as shown in FIG. As shown, the relative airflow passes through the upper and lower spaces of the moving blades 13, and the relative resistance of the tails of the blades is automatically minimized.

Since the wind driving force of the wind wheel of the present invention is far greater than the resistance, and the wind channel area can be arbitrarily increased, the airfoil blade 23 can be lengthened at will, so that the wind wheel with the above structure can obtain huge thrust and huge The huge moment formed by the force arm and the small resistance of the blade 23 make the wind wheel start small, the moment of inertia is huge, and the operation is stable. Therefore, the present invention is also an optimum structure for a large or very large wind turbine.

In order to make the wind turbine with the above structure have good anti-strong wind performance, The invention can be further improved. As shown in Fig. 15, a movable blade 12 is provided on the upper portion of the blade main body 11, and the movable blade 12 can be rotated along the joint of the movable blade 12 and the blade main body 11, and the blade main body 11 A spring 16 for resetting the movable blade 12 is also provided between the movable blade 12. When a strong wind suddenly occurs, the wind pressure pushes the movable blade 2, and the strong airflow flows out from the front upper window. After the strong wind, the movable blade 12 is automatically restored by the tension of the spring 16.

The number of wing-like blades of the present invention and the number of movable blade spacings per blade can be selected as desired, and are not limited and are shown in this embodiment. In general, the larger the diameter of the wind wheel, the more the wing-like blades. Among them, the force condition of the blade and the continuity of the rotation of the rotor are two key factors that determine the number of blades and the number of moving blades per blade.

In the wind turbine main body structure of the present invention, the wind turbine seat disk 25 adopts a seat disk with an axial flow vane, and as shown in FIGS. 3 to 5, the wind wheel seat disk 25 generates an upward axial flow wind when rotating, The axial flow wind can dissipate heat from the equipment that grabs 6 miles in the whole machine, effectively improving the ventilation conditions of the machine.

The present invention can also be provided with a safety stabilizing device and a steady speed braking device 28 on the main structure of the wind turbine drive. As shown in Figures 1 and 3, the safety stabilizing device comprises an upper stabilizing device 24 fixed to the middle flange seat 29 and a lower stabilizing device 26 fixed to the central shaft base 27, wherein the flange seat and the central shaft base 27 are bolted The central shaft base 27 and the nacelle 6 are connected by bolts, and the central axis ^{20 of the} wind wheel is assembled with the central shaft base 27 through the hole shaft. The upper end of the upper stabilizer 24 includes an upper stable steel ball 7, and the upper end of the lower stabilizer 26 includes a lower stable steel ball 8. On the upper and lower surfaces of the edge of the wheel hub 25 and the respective stable steel balls There is a gap of 3 ~ 5mm between them.

In normal wind, there is a gap between the rotating wind wheel seat plate 25 and the upper stable steel ball 7 and the lower stable steel ball 8, which will not be encountered. When the wind suddenly increases or the wind speed fluctuates greatly, the wind blade 23 The force receiving area is large, and it is easy to generate the impact component in the vertical direction, which causes the upper and lower sides of the wind wheel seat disk 25 to swing. At this time, the wind wheel seat disk 25 is in contact with the stable steel ball and rotates in the friction to stabilize the steel ball pair. The supporting force of the wind wheel seat disk 25 limits the tendency of the wind wheel center shaft 20 to increase the swinging motion, and the wind wheel body can be smoothly operated, thereby ensuring that the wind wheel center shaft 20 can stably rotate in any state.

In addition, due to the randomness of wind in different times and directions, the randomness is unpredictable. When the wind speed is high at some time or for a long period of time, the speed of the wind wheel may be overspeed, so a constant speed brake device 28 is added to the edge of the wheel hub 25. Therefore, it is ensured that the wind wheel is controlled to the specified speed when the wind speed is increased to a large extent, and at the same time, the wind blade 23 which is driven by the wind in the A zone (see Fig. 16) is increased due to the wind pressure of the wind tunnel during braking. The movable leaf plate 12 is opened (see FIG. 15), and the strong airflow force passes through the gap between the upper movable blade 12 and the blade main body 11, and the thrust is reduced to make the wind wheel achieve the deceleration effect.

In addition, the steady speed brake device 28 can be fully braked to keep the wind wheel in a stopped state, which provides convenience for the entire device during installation and maintenance.

The flap-reducing rotary-wing wind turbine of the present invention can meet the international standard for operating external conditions of wind turbines:

1. The maximum wind speed V is 35m/s, and the alpine region is 40m/s;

2. The normal operating temperature range of the unit is - 20 °C ~ +50 °C, and the cold area is - 25 °C ~ +45 °C; 3. The highest altitude of the unit is 4000m;

4. The relative humidity is 95%;

5. In the northern region, the dust conditions in the atmosphere should be considered in relation to the atmosphere that is not chemically contaminated.

It can be seen from this that the flap reduction type rotary wing type wind turbine of the present invention has the following significant advantages:

1. The invention can effectively improve the wind energy efficiency of the blade drive assembly. The structural feature of the blade drive assembly of the present invention is that a vertical axis flap reduction type rotor type wind wheel is used, and on the one hand, the wind wheel can be obtained. The driving torque is greatly increased, and the resistance is minimized. On the other hand, the wind blown in any one direction can exert the same effect on the wind wheel, so the wind energy efficiency of the structural wind wheel is better than other wind blade structures. The wind energy efficiency of the wind wheel is more than 50%;

2. The structural characteristics of the wind wheel of the invention also bring about small starting wind force, large pushing torque and huge moment of inertia, and the wind wheel of the invention can be powered in the wind state of 2 m/s to 40 m/s;

3. The invention is most suitable for large and very large wind turbines;

4. The invention can be used for power generation off-grid or grid-connected power generation;

5. The structure of the wind wheel of the invention has good anti-strength ability and no noise;

6, the process is convenient to manufacture, easy to install, the height of the whole machine can be reduced by more than half than the height of the propeller blade type; the manufacturing cost can be 1/3 or more less than the propeller blade type in the same power model, it will be the future The best structure of wind turbines for large wind farms.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention. While the invention has been described in detail with reference to the preferred embodiments of the present invention, it is understood that the invention may be modified or equivalently modified without departing from the spirit and scope of the invention.

Claims

Rights request

A flap-type drag-type wind turbine generator comprising a machine having a generator and a control device, and a blade drive assembly located at an upper portion of the machine gun, wherein the blade drive assembly is driven by a wind wheel The wind wheel central axis is a vertical vertical axis, and the wind wheel is provided with a plurality of wing-shaped blades mounted on the central frame of the wind wheel, and the wing-shaped blades are along the edge The front end of the wind wheel in the direction of rotation is small and has a large wind receiving groove at the rear, and the rear surface is provided with a wind receiving groove.

2. The flap reducing type rotary wing type wind power generator according to claim 1, wherein: the wing-shaped blade comprises a blade body, a movable blade disposed at a lower portion of the blade body, and a blade body fixed to a partition for separating the movable vane and limiting the range of movement of the movable vane, the movable vane being in rotational connection with the vane body, and forming a movable wind receiving trough with the partition and the vane main body.

3. The flap reducing type rotary wing type wind power generator according to claim 2, wherein: the front end of the wing-shaped vane has a circular arc shape, the upper surface is streamlined, and the lower surface is inclined to the horizontal plane. .

4. The flap reducing type rotary wing type wind power generator according to claim 2, wherein: the upper part of the main blade body is provided with a movable blade, and the movable blade and the main body of the blade are connected in a rotating manner. A spring for resetting the movable blade is provided between the main body of the blade and the movable blade.

The flap reduction type rotary wing type wind power generator according to claim 1, wherein: the rotor wheel of the wind wheel has an axial flow vane.

6. The flap reducing type rotary wing type wind power generator according to claim 1, wherein: the wind wheel seat disk edge of the wind wheel is provided with a safety and stability device for stably rotating the center axis of the wind wheel.

7. The flap reducing type rotary wing type wind power generator according to claim 6, The utility model is characterized in that: the safety stabilizing device is provided with a stable steel ball, and a gap is formed between the stable steel ball and the surface of the wind wheel seat plate.

The flap reduction type rotary wing type wind power generator according to claim 1, wherein: the wind wheel seat disk edge of the wind wheel is provided with a constant speed brake device for preventing the wind wheel rotation speed from exceeding a predetermined rotation speed.