CN113357078A

CN113357078A - Straight blade vertical axis wind turbine

Info

Publication number: CN113357078A
Application number: CN202010138846.7A
Authority: CN
Inventors: 徐幼麟; 詹胜
Original assignee: Hong Kong Polytechnic University HKPU
Current assignee: Hong Kong Polytechnic University HKPU
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2021-09-07
Anticipated expiration: 2040-03-03
Also published as: CN116181566A; CN113357078B

Abstract

The invention provides a straight-blade vertical-axis wind turbine, wherein the pitch angle of blades of the wind turbine can be adjusted, the wind turbine comprises a pitch angle control unit for adjusting the pitch angle of the blades of the wind turbine, and the pitch angle control unit comprises a connecting mechanism which is movably connected with the blades; and a guide mechanism mounted at the bottom end of the blade, the guide mechanism comprising a control ring and a control rail disposed below the blade, the control ring and control rail cooperating such that the pitch angle of the blade can be changed when the blade rotates, wherein the control rail is an annular rail having a varying pole diameter; and a wind direction control unit and a blade bearing unit.

Description

Straight blade vertical axis wind turbine

Technical Field

The invention relates to a wind driven generator, in particular to a vertical axis wind driven generator with straight blades.

Background

In recent years, Horizontal Axis Wind Turbines (HAWTs) have gained widespread use and commercial success worldwide due to their technological maturity. However, as the demand for high energy production increases, a trend is presented to further increase the size and weight of the HAWT, which leads to a number of challenging problems, e.g., high bending moments at the root of the cantilever blade, high overturning moments at the tower base, intolerable noise and expensive maintenance costs. Meanwhile, Vertical Axis Wind Turbines (VAWTs) have attracted more and more attention in recent years due to their advantages of being insensitive to wind direction, easy to install, low maintenance costs, and low aerodynamic noise. However, a fixed pitch Straight Blade Vertical Axis Wind Turbine (SBVAWT) experiences a continuous change in blade wind angle of attack due to its rotational mode, which results in low energy production and low self-starting capability. Moreover, the cantilevered support of the blade also limits the size of current SBVAWTs.

Disclosure of Invention

The present invention has been made keeping in mind all or at least one of the above problems occurring in the prior art, and an aspect of a first aspect of the present invention is to provide a straight blade vertical axis wind turbine having blades whose pitch angles can be adjusted, the wind turbine including a pitch angle control unit adjusting the pitch angles of the blades of the turbine,

the pitch angle control unit includes: the connecting mechanism is movably connected with the blade; and a guide mechanism installed at a bottom end of the blade, the guide mechanism including a control ring and a control rail disposed below the blade, the control ring and the control rail cooperating such that a pitch angle of the blade can be changed when the blade rotates, wherein the control rail is an annular rail having a varying pole diameter.

Preferably, the connection mechanism includes: the first connecting piece is movably connected with the upper end of the blade; and a second connector forming an active connection with the lower end of the blade, wherein the first connector is active connected with the upper end of the blade and the second connector is active connected with the lower end of the blade such that the blade can rotate and allow the pitch angle of the blade to be adjusted.

Preferably, the first and second connectors include a bearing and a connecting plate, respectively.

Preferably, the control ring is disc-shaped, and the control rail is fixed to the control ring and has a rectangular cross section.

Preferably, the guiding mechanism further comprises a control rod, one end of the control rod is mounted at the tail part of the bottom end of the blade, the other end of the control rod is mounted on the control track, and when the control rod runs along the control track, the tail part of the blade swings left and right around a movable connection point between the blade and a connecting piece (supporting arm) so as to change the pitch angle.

Preferably, the other end of the control rod is mounted with guide wheels that are clamped on both sides of the control rail to run on the control rail.

Preferably, the wind power generator further comprises a blade support unit supporting the blade, the blade support unit comprising a main support mechanism provided outside the main shaft of the wind power generator and fixed to a base built on the ground.

Preferably, the main shaft is provided on the main supporting structure by a plurality of rolling bearings and supported by the plurality of rolling bearings.

Preferably, the blade support unit further comprises a blade support mechanism, one end of the blade support mechanism is fixed to the main shaft of the wind turbine, and the other end of the blade support mechanism forms the movable connection with the blade through the connecting mechanism.

Preferably, the blade supporting unit further comprises a rolling member provided at a bottom end of the blade, and a rolling member fitting member provided above the ground, the rolling member rolling on the rolling member fitting member to achieve rotation of the blade.

Preferably, the pitch angle control unit further comprises an orientation member, one end of which is connected to the mount of the roller, and the other end of which is connected to a blade support structure included in the blade support unit.

Preferably, the wind power generator further includes a wind direction control unit configured to be able to rotate the control ring to a position corresponding to the inflow wind with respect to an angle of the inflow wind.

Preferably, the wind direction control unit comprises a sensing mechanism, a processor and a driving mechanism, wherein,

the sensing unit senses an angle of the inflow wind, the processor calculates a rotation angle by which the control ring is to be rotated according to the angle of the inflow wind, and the driving mechanism drives the control ring to rotate the calculated rotation angle.

According to the technical scheme of the first aspect of the invention, the pitch angle of the blade of the wind driven generator can be conveniently and quickly adjusted, the energy generation efficiency is improved, the weight of the blade is borne by the ground, the size of the supporting arm of the blade can be reduced, the air resistance can be reduced, the diameter of a large fan can be realized, the wind area of the wind turbine can be increased, and the output power of the wind turbine can be increased.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and it is obvious for those skilled in the art or ordinary skill in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 illustrates a block diagram of a straight blade vertical axis wind turbine according to the present invention.

Fig. 2 illustrates a blade arrangement of a straight blade vertical axis wind turbine according to the present invention.

Fig. 3(a) and 3(b) illustrate a structural view of the connection mechanism according to the present invention.

Fig. 3(c) and 3(d) illustrate another structural view of the connecting mechanism according to the present invention.

Fig. 4 illustrates a schematic view of a guiding mechanism and a blade pitch angle adjustment mechanism according to the present invention.

Fig. 5 illustrates a top view of a part of the components of a straight blade wind turbine according to the present invention.

Fig. 6 illustrates a schematic structural view of a wind direction control unit according to the present invention.

Fig. 7 illustrates a state diagram before and after the directional control is performed according to the present invention.

Fig. 8 illustrates a schematic diagram of pitch angle calculation according to the present invention.

Detailed Description

Embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings. It should be understood that the following embodiments are not intended to limit the present invention, and not necessarily all combinations of aspects described according to the following embodiments are required as to the means for solving the problems according to the present invention. For the sake of simplicity, the same reference numerals or signs are used for the same structural parts or steps, and the description thereof is omitted.

[ first embodiment ]

[ Structure of vertical-axis wind turbine with straight blades ]

The invention relates to a straight-blade vertical axis wind turbine which comprises a pitch angle control unit, a blade support bearing unit and a wind direction control unit. These units will be described separately below. Note that the generator of the present invention does not necessarily have to have the above three units at the same time, but may have one or more of the above units.

The overall construction of the generator of the invention is described below with reference to fig. 1, in which the components correspond respectively: 1, straight blades; 2, an upper supporting arm; 3 a lower support arm; 4, connecting plates; 5, a bearing; 6, a main shaft; 7 a main supporting tube; 8 rolling bearings; 9, a steel frame; 10, a ground surface; 11 steel wheels; 12 steel rings; 13 columns; 14 a guide wheel; 15 controlling the track; 16 control loops; 17 a worm gear; 18 a control system; 19 a generator; 20 an elastic coupling; 21, an upper outer hoop; 22, connecting the upper connecting plate; 23, a lower outer hoop; 24 lower connecting plates; 25 step motor; 26 an orientation bar; 27 a control lever; 28 a planar bearing; 29 spherical bearings; 30 connecting rod of control ring and worm wheel; 31 a worm gear; 32 a first drive bearing; 33 a worm; 34 a second drive bearing; 35 fixing the bottom plate; 36 a driver; 37 an anemometer; 38A/D; 39 a computer; 40D/A; 41 control loop direction; 42 rotate the main axis.

[ Pitch angle control Unit ]

The following first describes the pitch angle control unit of the present invention. The pitch angle control unit comprises a connecting mechanism and a guide mechanism.

Referring to fig. 1, the connecting mechanism realizes the movable connection between the blade (taking a straight blade 1 as an example in the invention) and the upper support arm 2 of the fan and/or the movable connection between the blade 1 and the lower support arm 3 of the fan, and the movable connection can be a pin connection, for example. Specifically, the connection between the straight blade 1 and other parts, such as the upper support arm 2 and the lower support arm 3, is achieved by bearings connected to the upper/lower ends of the straight blade 1. Wherein the position of the connection plate 4 can be set to the position of minimum stress. For example, in order to reduce the bending stresses of the blade caused by centrifugal and aerodynamic forces, it is possible, according to mechanical calculations, to find the position of the attachment height at which the point of maximum stress on the blade is at a minimum, this position being the position of the pin connection between the blade and the support arm. This position may be between the centrifugal and aerodynamic centers of the blade, as seen in cross-section of the blade.

The number of the blades may be multiple, such as 3 or more, and the blades may be arranged in a single row, or in multiple rows or other arrangements. For convenience of explanation, the present invention is described with reference to fig. 2, which includes three blades arranged in a single row, and the three blades are uniformly spaced at 120 degrees.

The connection mechanism in the present invention includes, for example: the bearing, the connecting plate, the outer hoop and the like are used for realizing the connection between the blade and the upper support arm and the lower support arm. The connection relationship between the blade and the upper support arm is illustrated in fig. 3(a) and 3(b), and it should be noted that the connection relationship illustrated in fig. 3(a) and 3(b) is merely an example, and other connection manners may be adopted in the present invention besides the manner illustrated. The upper support arm 2 is connected to the upper end of the straight blade 1 via a bearing 5. The bearing 5 may be a self-aligning ball bearing, for example, and the upper support arm 2 is fixed to the upper connecting plate 22 by the ball bearing, and the upper connecting plate 22 is fixed to the upper outer hoop 21 by welding, for example. An upper outer hoop 21 is provided at the periphery of the upper part of the blade 1, which enables connection of the blade 1 with the upper support arm 2 via bearings.

The connection of the blade to the lower support arm is illustrated in fig. 3(c) and 3(d), it being noted that the connection shown in the figures is merely an example and that the invention may be used with other connections than those shown in the figures. The lower supporting arm 3 is connected with the lower connecting point of the straight blade 1 through a bearing (such as a ball bearing), so that the blade can rotate around the connecting point in the operation process, and the purpose of changing the pitch angle is achieved. The lower support arm 3 is fixed to the lower web 24 by means of ball bearings, and the lower web 24 is fixed to the lower outer band 23, for example by welding. A lower outer hoop 23 is provided at the periphery of the upper part of the blade 1, which enables the connection of the blade 1 with the lower support arm 3 via the realization.

As shown in fig. 3(a) -3(d), the upper and

lower support arms

2, 3 are movably connected with the upper/lower ends of the straight blades 1 via bearings and connection plates, respectively, such that the blades 1 are allowed to rotate and their pitch angles to be adjusted.

The pitch control unit of the invention may further comprise a steering mechanism which may steer the blades to effect rotation of the blades about the main shaft at a predetermined pitch angle. Fig. 4 illustrates a structural view of the guide mechanism according to the present invention (a structural view in which the guide wheels 14 are engaged with the control rails 15 on the control ring 16). At the same time the principle of blade pitch angle adjustment according to the invention is also shown (steel wheel 11, load bearing steel ring 12, control rail 15, etc.). The guiding mechanism of the present invention, which will be described below with reference to fig. 4 and 5, may comprise, for example, a control ring, a control track and a control rod disposed below the blade 1. Wherein examples of the control ring 16 include a circular steel ring made of metal such as steel, the control rail 15 may be a metal ring having a rectangular cross section, which is welded on the control ring, and examples of the control rail include an annular rail made of metal such as steel, which is welded on the control ring 16. The blade pitch angle may be steered by the steering mechanism, for example: the wind turbine rotates around a rotation main axis 42 under the action of wind, the blade 1 also rotates along with the wind turbine, the control rod 27 fixedly installed at the tail of the bottom end of the blade 1 rotates along with the wind turbine, two bearing guide wheels are installed at the other end B of the control rod 27 and clamped at two sides of an annular track wall, and the pole diameter of the control rod is changed because the control track is not a circle, so that the tail of the blade 1 is pulled inwards or pushed outwards when the end B of the control rod operates along the track, the blade 1 rotates around a point A (5, a bearing), and the pitch angle of the blade is changed. Alternatively, it can be said that when the control rod 27 is moved along the control track 15, the tail of the blade 1 is swung to the left and right about the point of articulation between the blade 1 and the lower support arm, thereby changing the pitch angle. As shown in FIG. 4, the stepping motor 25 is connected with the worm gear 17, the stepping motor 25 drives the worm gear 17, and the worm gear 17 pulls the four connecting rods 30 connecting the worm gear with the control ring shown in FIGS. 4 and 5, so that the control ring 16 rotates along the bearing ring 12 with the main axis of the wind turbine as the center, thereby enabling the control ring to be in the same direction as the wind, as shown in FIG. 7.

In addition, the pitch control unit of the present invention may also comprise an orientation member, see fig. 3c, which can assist in running the load bearing steel wheel tangentially when it is turned, i.e. orientation. An example of an orientation member is an orientation rod 26, one end of which is fixedly connected with the axle seat of the steel wheel 11 and the other end of which is fixedly connected with the lower support arm 3. The process of the change of the pitch angle can be described with reference to fig. 4, where a guide wheel 14 is mounted at the bottom of the blade 1. On the control ring 16 a specially designed track, i.e. a control track 15, is mounted. The control track 15 is designed according to a pitch angle, in particular an optimized pitch angle, which is optimized according to the modified blading theory based on the real-time measured forces (e.g. tangential and/or normal forces) experienced by the blade 1 due to the incoming wind, the specific design of which will be described in detail later. The control ring 16 is rotatable around the main support tube 7 and it is mounted on the load bearing steel ring 12 by means of a plurality of bearings so that the control ring 16 can rotate relative to the ground. The guide wheels 14 move along the control track 15 so that the pitch angle of the blades can be changed when the straight blades 1 rotate.

The pitch angle adjustment is exemplarily described below with reference to fig. 4. Pitch is defined herein as the angle between the chord line and the tangent line of the blade as it rotates. The state of the blade shown in FIG. 5 is a state where the pitch angle is adjusted. The blades 1 are pulled by the control rods, thereby changing the pitch angle. Wherein, one end of the control rod is connected with the tail part of the bottom end of the blade 1, and the other end is connected with the control track 15.

Fig. 5 shows a state diagram when the pitch angle of the blade 1 is changed, when the pitch angle of the blade 1 is adjusted, the angle of the blade with respect to the chord line of the blade changes in the tangential direction of the outermost ring in fig. 5, which is the adjustment of the pitch angle.

The above is an example of the blade pitch angle control unit of the present invention, which is intended to be illustrative and not limiting, and according to the blade pitch angle control unit of the present invention, optimal pitch angle adjustment of the blades is achieved, thereby improving the efficiency of energy generation.

[ blade support Unit ]

The wind power generator of the present invention includes a support unit including: a main support mechanism and a blade support mechanism.

The main support structure is arranged outside the main shaft 6 of the wind turbine and is fixed to a foundation built on the ground, which may be a strong steel frame 9 made of steel, or a foundation such as a concrete foundation or some other form. The main support mechanism may be in the form of a rack or tube that provides support for the blades 1 etc., here the example of a main support structure is a main support tube 7.

The wind power generator has a main shaft 6, as shown in fig. 1, the main shaft 6 being arranged on a main support tube 7 outside the shaft 6 by means of a plurality of rolling elements, such as rolling bearings 8, the main shaft 6 being supported by the rolling bearings 8. The main support pipe 7 is fixed to a base built on the ground 10. The base may be made of metal or other sturdy material, and the base is made of metal in this document, and a steel frame 9 is a specific example. A generator 19 for converting kinetic energy converted from wind energy into electrical energy is connected to the main shaft 6 (e.g. by means of an elastic coupling) and mounted inside the steel frame 9.

The blade supporting mechanism comprises an upper supporting arm 2 and a lower supporting arm 3, one end of the upper supporting arm 2 and one end of the lower supporting arm 3 are respectively fixed on the main shaft 6, and the other ends of the upper supporting arm 2 and the lower supporting arm 3 are respectively in movable connection with the blade 1, and the movable connection can be realized through the connecting mechanism in the invention.

The blade support mechanism further comprises a rolling member and a rolling member mating member. The rolling element engaging members may provide a track for the blade 1 to rotate about the main shaft 6. The rolling member is arranged at the bottom end of the blade, and the rolling member mating member is arranged above the ground, and the rolling member rolls on the rolling member mating member to enable the blade 1 to rotate around the main shaft 6.

Examples of rolling elements include, but are not limited to, load-bearing wheels, which may be spherical steel wheels 11 with built-in bearings, examples of rolling element mating elements include, but are not limited to, a solid load-bearing steel ring 12, which steel ring 12 may be an annular track centered on the main shaft 6, the spherical steel wheels 11 being mounted under the bottom of each blade 1, the solid steel ring 12 being fixed above the ground 10 by support means, such as support posts 13, the spherical steel wheels 11 rolling on the track of the steel ring 12. In this way, the weight of the blade 1 can be supported by the ground through the steel ring and the series of columns, so that the sizes of the upper support arm 2 and the lower support arm 3 can be reduced to reduce air resistance, meanwhile, due to the self-supporting arrangement, the diameter of the fan can be made large, the wind area of the wind turbine can be greatly increased, and the output power of the wind driven generator is also greatly increased.

[ control unit for wind direction ]

The wind direction control unit can control an angle of the inflow wind to rotate the control ring to a corresponding position. Since the angle of the inflow wind changes with the factors of weather, season, etc., and the fixed pitch blades cannot change the pitch angle with the change of the wind direction, energy generation efficiency is low, and even the wind turbine cannot be started by itself. The wind direction control unit in the present invention can adjust the control loop for the angle of the inflow wind, thereby achieving an optimal pitch angle for each azimuth angle and improving energy generation. The wind direction control unit may include a sensing mechanism, a processor, and a drive mechanism. The sensing mechanism may include a sensor, the processor may include a computer, and the drive mechanism may include a drive motor. An example of the wind direction control unit is described below with reference to the drawings.

As shown in fig. 6, the wind direction control unit may include: wind speed and direction sensor 37, A/D converter 38, computer 39, D/A converter 40, stepping motor driver 36, stepping motor 25 and worm wheel 17.

The wind speed and direction sensor measures wind speed and direction, outputs the measurement result as an analog voltage signal and sends the analog voltage signal to the A/D converter. The a/D converter converts the analog voltage signal into a digital signal, which is output to a processor (e.g., computer 39). The processor analyzes the input data, determines the difference between the measured wind direction and the current position of the control ring, and calculates the angle and direction of rotation of the control ring, wherein the direction of the control ring may be identified by the angle of deviation of the control ring, e.g., the angle of the control ring is 0 ° when the axis of the control ring is oriented north, the direction of the control ring is- α ° when the axis of the control ring is oriented west at an angle α °, and the direction of the control ring is- α ° or 360- α ° when the central axis of the control cycle is oriented east at an angle α °.

The processor then sends the calculated values of the direction and angle of rotation to the D/a converter. The analog voltage signal is converted by the D/A converter and output to the driver, the step motor immediately turns through the required angle according to the required turning direction, so as to drive the worm turbine to rotate, and finally, the control ring connected with the turbine is turned to the preset position. When the control ring is at the predetermined position, the direction of the incoming wind coincides with the direction of the control ring. At the position, the wind driven generator can be started automatically and has high efficiency of absorbing wind energy. As shown in fig. 7, before the wind direction is controlled, the control ring 16 is, for example, in the north direction, and the angle between the incoming wind and the north direction is α. Then, the direction in which the control ring is to be rotated is determined for the wind direction control unit, and the control ring is rotated by an angle α so that the wind direction coincides with the direction of the control ring.

Specifically, referring to fig. 2, 5 and 6, the control ring 16 is provided with specially designed control tracks designed according to pitch angle optimized according to modified blading theory based on measured forces on the blades. The control ring 16 is rotatable around the main support tube 7 and the control ring 16 is arranged on the steel ring 12 by means of a number of bearings (not shown) such that the control ring 16 can rotate relative to the ground. The guide wheels 14 roll along the control track 15 so that the pitch angle of the blades can be changed when the blades 1 rotate. The shape of the control track 15 is a ring with a varying pole diameter, the shape of which can be designed for a given optimum pitch angle, so that an optimum pitch angle can be achieved for each azimuth angle and energy production is improved. Since the control guide tracks follow a certain reference direction with respect to the incoming wind, the control system is designed to implement it to rotate the control ring 16 to a given position for a given wind direction by means of the turbine transmission. The given position enables the fan to achieve good self-starting performance and large power output.

The design of the control track can be exemplified in connection with fig. 8, in which fig. 8 the blade 1 and the various angles are marked from above. Wherein, the point A is a connecting point of the lower supporting arm and the blade; point B is the position of the control rod end point before pitch angle adjustment, point B ' is the position of the control rod end point after pitch angle adjustment, which is a point on the track that controls the pitch angle of the blade, and its position (coordinate values x, y) is calculated by equations (1) to (5), the parameters include the blade pitch angle β, and the position B ' corresponds to the pitch angle β one-to-one, or conversely, point B ' on the control track controls the pitch angle β of the blade.

The calculation process for controlling the track design is described below with reference to equations (1) to (5). After the rotor radius R of the wind turbine and other relevant component parameters are selected, a control track can be designed according to a given calculation formula according to the required optimized pitch angle beta. The optimum pitch angle is a function of azimuth, with different positions and different pitch angles.

The respective parameters in fig. 8 represent:

α: when beta is 0, the connecting line AB of the control rod end B point and the rotation point A forms an included angle with a straight line AD which passes through the point A and is vertical to OA, and OA is the lower supporting arm.

Beta: pitch angle of blade

γ: after β changes, the original control rod end B shifts to B ', and γ is the angle between the connection line OB' and OA.

θ is the azimuth of the lower support arm.

Is the angle between line OB' and coordinate axis ox.

The point A is a connecting point of the lower support arm and the blade; and the position of the control rod end point when the point B is equal to 0. The pitch angle β is calculated below by taking as an example the radius R of the rotor of the wind turbine 1000mm, OA 1000-64 936(mm), Ab 150(mm), and Bb 50(mm), where, for example, the pitch angle β is less than 0.

When beta is 0

Or

For the other pitch angles, the calculation equations (2), (3), (4), (5) are the same.

Although the present invention has been described with reference to the exemplary embodiments, the embodiments are only for illustrating the technical idea and features of the present invention, and the protection scope of the present invention is not limited thereby. Any equivalent variations or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A straight blade vertical axis wind turbine, the pitch angle of the blades of which can be adjusted, the wind turbine comprising a pitch angle control unit that adjusts the pitch angle of the blades of the wind turbine,

the pitch angle control unit includes:

the connecting mechanism is movably connected with the blade; and

a guide mechanism mounted at the bottom end of the blade, the guide mechanism comprising a control ring and a control rail disposed below the blade, the control ring and control rail cooperating such that the pitch angle of the blade can be changed as the blade rotates,

wherein the control track is an annular track with a varying pole diameter.

2. A wind power generator as claimed in claim 1, wherein the connection mechanism comprises:

the first connecting piece is movably connected with the upper end of the blade; and

a second connecting piece which is movably connected with the lower end of the blade,

wherein the first connector is in movable connection with the upper end of the blade and the second connector is in movable connection with the lower end of the blade such that the blade is rotatable and allows the pitch angle of the blade to be adjusted.

3. The wind generator of claim 2, wherein the first and second connectors comprise bearings and connection plates, respectively.

4. The wind power generator as in claim 1,

the control ring is disc-shaped, and,

the control track is fixed to the control ring and has a rectangular cross-section.

5. A wind power generator according to claim 1, wherein the guiding mechanism further comprises a control rod, one end of the control rod is mounted on the tail of the bottom end of the blade, and the other end of the control rod is mounted on the control track, so that when the control rod runs along the control track, the tail of the blade is swung to the left and right through the connecting mechanism to change the pitch angle.

6. A wind powered generator as claimed in claim 5, wherein the tail of the blade swings side to side about an articulation point between the blade and blade support structure comprised by the attachment structure to vary the pitch angle as the control rod travels along the control track.

7. A wind powered generator as claimed in claim 5 wherein said other end of the control rod is fitted with guide wheels which clamp on either side of said control track to run on said control track.

8. The wind power generator as claimed in claim 1, further comprising a blade support unit supporting the blade, the blade support unit comprising a main support mechanism disposed outside a main shaft of the wind power generator and fixed to a base built on the ground.

9. Wind generator according to claim 8, wherein the main shaft is provided on a main support structure by means of a plurality of rolling bearings and is supported by said plurality of rolling bearings.

10. The wind turbine according to claim 8, the blade support unit further comprising a blade support mechanism having one end fixed to a main shaft of the wind turbine and another end forming the movable connection with the blade via the connection mechanism.

11. The wind power generator as claimed in claim 8, wherein the blade support unit further comprises a rolling member provided at the bottom end of the blade and a rolling member fitting provided above the ground, the rolling member rolling on the rolling member fitting to effect rotation of the blade while directly transferring the blade weight to the ground.

12. A wind power generator according to claim 11, wherein the pitch angle control unit further comprises an orientation member having one end arranged for connection to the roller and another end connected to a blade support structure comprised by the blade support unit.

13. The wind power generator of claim 1, further comprising a wind direction control unit configured to rotate the control ring to a position corresponding to an angle of an incoming wind.

14. The wind generator as in claim 13, the pair of wind direction control units comprising a sensing mechanism, a processor, and a drive mechanism, wherein,

the sensing unit senses an angle of the inflow wind,

the processor calculates a rotation angle by which the control ring is to be rotated, based on the angle of the incoming wind, and,

the driving mechanism drives the control ring to rotate by the calculated rotation angle.