KR20150033762A - Wind Turbine Blade Pitch Control Device and Wind Turbine Having the Same - Google Patents

Abstract

According to the present invention, a blade pitch control device for a wind power generator comprises: a hub combined with a terminal end of one side of a main shaft of the wind power generator; a housing installed to cover the hub by being separated from the hub; a plurality of flanges installed in the housing where a blade of the wind power generator is combined; and a pitch control portion controlling a pitch of the blade by rotating the flanges in accordance with a straight motion in a longitudinal direction of the main shaft by being installed to connect the hub and the flanges.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a blade pitch adjusting device for a wind turbine generator,

The present invention relates to a blade pitch adjusting device for a wind power generator and a wind power generator including the blade pitch adjusting device. More particularly, the present invention relates to a blade pitch controlling device for controlling a pitch of blades according to a wind speed to reduce a burden on the blades, To a blade pitch adjusting device for a wind power generator capable of preventing a problem such as load of a generator and the like, and a wind power generator including the blade pitch adjusting device.

Wind power is a technology that uses the aerodynamic characteristics of the kinetic energy of the air flow to convert the rotor into mechanical energy and obtain electricity using this mechanical energy.

In addition, since wind power generation uses pollution-free and infinite winds scattered everywhere, it has little impact on the environment and can utilize the land efficiently. In the case of large-scale power generation complexes, It is a new energy generation technology to the extent possible.

Generally, such a wind turbine generator includes a body rotatable above a tower having a predetermined height, and at least two or more blades rotated by wind force are equally spaced on the body. The rotational force of the blade causes electric energy And a generator for converting the rotational force through the accelerator to electrical energy.

However, the wind turbine generator generates electric energy through the blades rotated by the natural wind speed. When the rotational speed of the blades in a strong wind becomes higher than a predetermined value, the rotational force is increased through the accelerator and the generator is overloaded There is a problem that the lifetime of the wind turbine generator can be shortened, and there is a problem that various safety accidents such as a fire due to overheating of the generator may occur.

KR2007-0054331 10

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the conventional problems, and it is an object of the present invention to provide a method and apparatus for controlling the pitch of blades according to the wind speed of the wind to reduce the burden on the blades and control the rotational speed of the blades, And to provide a wind power generator including the blade pitch adjusting device for the wind power generator.

The objects of the present invention are not limited thereto, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the object of the present invention, there is provided an apparatus for adjusting blade pitch for a wind turbine, comprising: a hub coupled to one end of a main shaft of a wind turbine; a housing spaced apart from the hub to surround the hub; And a pitch adjusting unit connected to the hub and the flange for adjusting the pitch of the blade by rotating the flange in accordance with the longitudinal linear motion of the main shaft.

The pitch adjusting unit may include a rotation shaft connected to the flange, and a link connected to the eccentricity of the rotation shaft so as to rotate the rotation shaft by a predetermined angle in accordance with the linear motion length of the hub by connecting the hub and the rotation shaft .

The turbine further includes a connecting shaft connecting the rotating shaft and the flange to correspond to a size and a capacity of the hub, the housing, and the wind turbine generator.

The pitch adjusting unit may be a knuckle joint or a universal joint for changing the rectilinear motion of the main shaft into a rotational motion and transmitting the rotational motion to the flange.

The main shaft may further include an elastic member for elastically supporting the main shaft backward.

The main shaft may further include an actuator for linearly moving the main shaft.

The actuator may be connected to the anemometer to control the distance of the rectilinear movement according to the wind speed measured by the anemometer to adjust the rotation angle of the flange.

The apparatus may further include a first bearing holder provided on the outer circumferential surface of the housing so as to correspond to the flange, and a first bearing inserted into the first bearing holder.

The cover may further include a cover provided on a rear surface of the housing.

The cover may further include a second bearing holder provided at one side of the cover so as to correspond to the connection shaft, and a second bearing inserted into the second bearing holder.

As another category, a wind power generator for achieving the object of the present invention includes a blade pitch adjusting device for a wind power generator having the above-described configuration.

The blade pitch adjusting device for a wind power generator of the present invention and the wind power generator including the blade pitch adjusting device have the following effects.

First, the pitch of the blade is automatically adjusted so as to correspond to the wind speed, so that it is possible to continuously generate power by the necessary torque.

Secondly, it is possible to prevent excessive rotation of the blades due to a wind speed above a reference value, thereby preventing the generator from being overloaded.

Third, when a strong wind occurs, the pitch of the blade rotates to reduce the burden on the blade, thereby extending the service life of the blade and the wind power generator.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, And shall not be interpreted.
1 is a perspective view of a blade pitch adjusting apparatus for a wind power generator according to the present invention;
2 is a partially exploded perspective view of a blade pitch adjusting device for a wind turbine according to the present invention;
3 is a schematic view showing an operating state of a pitch adjusting unit according to the present invention; And
4 is a perspective view of a wind power generator including a blade pitch adjusting device for a wind power generator according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Configuration of blade pitch adjustment device for wind power generator

FIG. 1 is a perspective view of a blade pitch adjusting apparatus for a wind turbine according to the present invention, and FIG. 2 is a partially exploded perspective view of a blade pitch adjusting apparatus for a wind turbine according to the present invention. 1 and 2, the blade pitch adjusting apparatus 10 for a wind power generator according to the present disclosure includes a hub 100, a housing 200, a flange 300, a pitch adjusting unit 400, (Not shown) and a cover 700.

The hub 100 is provided at one end of the main shaft 800 of the wind power generator where the blades are coupled and has a pitch adjusting unit 400 for adjusting the pitch of the blades by rotating the flange 300 at a predetermined angle. to be.

The hub 100 may be formed in a polygonal column shape corresponding to the number of cylinders or blades, and a through hole through which the main shaft 800 can be inserted may be formed at a center of the hub 100. In the end of the main shaft 800, Bolts or the like may be combined to fix the hub 100. [

An insertion groove is formed on an outer circumferential surface of the hub 100 so that a coupling member 440 such as a hinge bolt or the like coupled to the link 420 of the pitch adjusting portion 400 can be inserted. In order to facilitate the rotation thereof, it is preferable that the position is deviated from the center. Preferably, it is formed at a position deviated from the center to the outside.

The housing 200 has a circular ring shape or a polygonal ring shape corresponding to the number of blades and has the same center of rotation as the hub 100. The housing 200 is spaced apart from the hub 100 by a predetermined distance to surround the hub 100 do.

The housing 200 is provided with a space in which the flange 300 coupled with the blade is provided on the outer circumferential surface, and a plurality of through holes are formed so that the flange 300 can be inserted therein. put. When the housing 200 has a circular ring shape, a flat surface may be formed on one side of the flange 300 so that the flange 300 can be easily coupled with the flange 300.

The flange 300 is inserted into the through hole of the housing 200 and is connected to one end of the housing 200 exposed to the outside. The shape of the flange 300 may be variously formed in accordance with the size and type of the blade.

For example, a portion of the housing 200 that is exposed to the outside may have a protruding portion formed with a flat portion integrally therewith in order to firmly engage with the blade.

The pitch adjusting unit 400 is provided to connect the hub 100 and the flange 300 so as to convert the rectilinear motion in which the main shaft 800 advances or retracts in the longitudinal direction into rotational motion to rotate the flange 300, It is a device to adjust the pitch of the blade. The pitch adjusting unit 400 includes a rotating shaft 410, a link 420, and a connecting shaft 430, for example.

The rotation shaft 410 is connected to the flange 300 through the link 420 so as to have the same center axis as the end of the flange 300 inserted into the housing 200. At this time, the portion of the rotary shaft 410 coupled with the link 420 is not the center of the rotary shaft 410 but is eccentric. In this way, when the main shaft 800 linearly moves by eccentric connection with the link 420, the rotation is facilitated accordingly.

The link 420 is connected to the hub 100 and the rotation shaft 410 so as to connect the hub 100 to the rotation shaft 410. The link 420 converts the longitudinal movement of the main shaft 800 into rotational motion and transmits the rotational motion to the rotational shaft 410. One end of the link 420 is connected to the hub 100 and the other end of the link 420 is connected to the eccentricity of the rotation shaft 410.

3 is a schematic view showing an operation state of the pitch adjusting unit 400 according to the present invention. 3, when the main shaft 800 coupled with the hub 100 linearly moves in the longitudinal direction, the hub 100 is driven together to correspond to the rectilinear motion of the main shaft 800, The link 420 is also moved so that the eccentric shaft of the rotary shaft 410 rotates and the flange 300 connected to the rotary shaft 410 rotates. This will be described in more detail as follows.

3A, when the main shaft 800 is straightened by the driving of the actuator, the hub 100 goes straight together, and the link 420 connected to the hub moves the eccentricity of the rotary shaft 410 in one direction Thereby rotating the rotary shaft 410. Thus, the flange 300 connected to the rotary shaft 410 is rotated, and the pitch of the blade is adjusted.

3B, when the main shaft 800 is moved backward by the driving of the actuator, the hub 100 moves back together, and the link 420 connected to the hub 100 moves in the opposite direction to the eccentricity of the rotation shaft 410 And rotates the rotating shaft 410 while moving it. Thus, the flange 300 connected to the rotary shaft 410 is rotated, and the pitch of the blade is adjusted.

The connecting shaft 430 is connected to the rotating shaft 410 and the flange 300 when the length of the rotating shaft 410 is short in consideration of the sizes of the housing 200, the hub 100, ).

In another embodiment, the pitch adjusting unit 400 may use a knuckle joint or a universal joint for changing the rectilinear motion to a rotational motion. As described above, the pitch adjusting unit 400 can be variously modified in consideration of the size, capacity, installation environment, and the like of the wind power generator.

The main shaft 800 of the pitch adjusting apparatus 10 according to the present invention can be driven by an actuator. This driving method will be described in more detail as follows. The actuator is provided to be connected to the other end of the main shaft 800 to linearly move the main shaft 800 forward or backward by a predetermined length in consideration of the wind speed. The actuator is connected to a wind power generator or an anemometer installed around the wind turbine, and adjusts the pitch of the blades by adjusting the direction and length of the straight movement of the main shaft 800 to correspond to the wind speed.

The other end of the main shaft 800 may further include an elastic member 500 for elastically supporting the main shaft 800 rearward. The elastic member 500 elastically supports the main shaft 800 rearward so that when the actuator is not driven or the actuator does not operate due to failure or the like, the main frame 800 is moved backward Elastic support.

A bearing holder 610 and 620 may be further provided in which a plurality of bearings and bearings for inserting the flange 300 and the connecting shaft 430 in a stable manner and suppressing noise generation are inserted.

The first bearing holder 610 is provided to correspond to a position where the flange 300 is disposed on the outer peripheral surface of the housing 200 so as to stably support the rotation of the flange 300 when the flange 300 is rotated, Thereby providing a space into which a first bearing for suppressing the generation of vibration can be inserted.

The second bearing holder 620 is a device for stably supporting the connecting shaft 430 when the connecting shaft 430 rotates and providing a space into which a second bearing for suppressing the generation of noise and vibration can be inserted. The second bearing holder 620 is provided to correspond to one side of the cover 700, which will be described later, and preferably the connection shaft 430 is disposed to support the rotation of the connection shaft 430.

The cover 700 is provided on the rear surface of the housing 200 to facilitate coupling with the nacelle 1000 and to prevent foreign substances such as dust from entering the interior of the housing 200. The cover 700 has a flat plate shape corresponding to the housing 200. A plurality of insertion grooves 710 are formed at a position corresponding to the second bearing holder 620 so that the second bearing holder 620 may be provided on one side of the housing 200.

Composition of wind power generator

4 is a perspective view of a wind power generator including a blade pitch adjusting device for a wind power generator according to the present invention. The wind turbine generator according to the present invention can be manufactured by manufacturing the pitch controller 10 corresponding to the capacity and size of the wind turbine generator and by using the pitch controller 10 as a protrusion And is coupled to the main shaft 800.

An actuator (not shown) for moving the main shaft 800 forward and backward is coupled to the rear end of the main shaft 800.

As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

10: Pitch adjusting device
100: Hub
200: Housing
300: Flange
400:
410:
420: Link
430: connection axis
440:
500: elastic member
610: first bearing holder
620: second bearing holder
700: cover
710: Insertion groove
800: Main shaft
1000: Nacelle

Claims (11)

A hub coupled to one end of the main shaft of the wind power generator;
A housing spaced apart from the hub to surround the hub;
A plurality of wind turbines mounted on the housing and coupled to the blades of the wind turbine generator; And
A pitch adjusting unit coupled to the hub and the flange for adjusting the pitch of the blades by rotating the flange in accordance with the longitudinal linear motion of the main shaft;
And a blade pitch adjusting device for a wind power generator. The method according to claim 1,
Wherein the pitch adjusting unit comprises:
A rotating shaft connected to the flange; And
A link connected to the eccentricity of the rotary shaft so as to rotate the rotary shaft by a predetermined angle in accordance with a linear motion length of the hub by connecting the hub and the rotary shaft;
And a blade pitch adjusting device for a wind power generator. 3. The method of claim 2,
Further comprising a connecting shaft connecting the rotating shaft and the flange to correspond to sizes and capacities of the hub, the housing, and the wind turbine generator. The method according to claim 1,
Wherein the pitch adjusting unit changes a rectilinear motion of the main shaft into a rotational motion and transmits the rotational motion to the flange, or a universal joint. The method according to claim 1,
And an elastic member for elastically supporting the main shaft backward is further provided at the other end of the main shaft. The method according to claim 1,
And an actuator for linearly moving the main shaft at the other end of the main shaft. The method according to claim 6,
Wherein the actuator is connected to the anemometer and controls the distance of the rectilinear movement according to the wind speed measured by the anemometer to adjust the rotation angle of the flange. The method according to claim 1,
A first bearing holder provided on the outer circumferential surface of the housing so as to correspond to the flange; And
A first bearing inserted into the first bearing holder;
And a blade pitch adjusting device for a wind power generator. The method of claim 3,
And a cover provided on a rear surface of the housing. 10. The method of claim 9,
A second bearing holder provided at one side of the cover so as to correspond to the connection shaft; And
A second bearing inserted into the second bearing holder;
And a blade pitch adjusting device for a wind power generator. A wind power generator comprising a blade pitch adjustment device for a wind power generator according to any one of claims 1 to 10.

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