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INVENTION
Patent of the Russian Federation RU2253038
Wind turbine (Wind turbine)
The name of the inventor: Cheboksarov V.V. (RU); Cheboksarov V.V.
The name of the patent holder: Far Eastern State Technical University
Address for correspondence: 690950, Primorsky Territory, Vladivostok, ul. Pushkinskaya, 10, FESTU, Patent Department
Date of commencement of the patent: 2003.06.06
The invention relates to the field of wind energy. The technical result consists in simplifying the design. The windmill includes a rotor rotatably mounted with respect to a vertical axis and rotary blades rotatably mounted with respect to their vertical axes fixed to the rotor within an angle of ± 70 ° relative to the tangent to the rotor. The blades are asymmetrical with respect to their turning axes. The larger portion of the asymmetric blade is flexible or composite with the possibility of bending in the plane of rotation. The end of the larger portion of each asymmetric blade is connected by a flexible connection to the rotor housing at a point located on one circle with the rotation axes of the blades from the side of the large portions of these blades. This flexible connection has a slack in the blade position with zero deviation from the tangent to the rotor.
DESCRIPTION OF THE INVENTION
The invention relates to the field of wind energy.
A wind turbine with a vertical axis of rotation of a rotor is known, its blades rotate about vertical axes fixed on the rotor (see RF patent No. 21 090992, Bulletin No. 26, 1998).
There is also a wind turbine with a vertical axis of rotation of the rotor, whose blades also rotate about the axes fixed on the rotor. (See RF patent No. 218705, Bulletin No. 25, 1998)
The disadvantage of both designs is the need to forcefully rotate the blades in accordance with the angle of rotation of the rotor and the direction of the vector of wind speed.
Known wind turbine with a vertical axis of rotation of the rotor, in the design of which the symmetrical blades rotate around the vertical axes by the force of the wind, for which additional vane fans and mechanisms for transferring their movement to the main blades are provided. (See RF patent No. 21 09094, Bulletin No. 26, 1998)
This design of the wind turbine most closely matches most of the features with the proposed technical solution and is used as a prototype.
The disadvantage of the prototype is the need to have additional vane fans and gear or belt drives with a given gear ratio.
The task, to solve which the claimed solution is directed, is the simplification of the design by excluding weathervanes and intermediate gears when setting the angle of rotation of the blade with the help of wind.
The technical result achieved in solving this problem is expressed in the free rotation of the blades within a given angle, ensuring the optimal geometry of the blade and increasing the traction characteristics of the blade.
The object is achieved in that a wind turbine comprising a rotor mounted rotatably about a vertical axis and rotatable blades rotatable with respect to their vertical axes fixed to the rotor is characterized in that the blades are asymmetric with respect to their pivot axes and are mounted with the possibility Free rotation within an angle of ± 70 ° relative to the tangent to the rotor.
Moreover, a larger portion of the asymmetric blade is made flexible or composite with the possibility of bending in the plane of rotation.
In this case, the end of a larger portion of each asymmetric blade is connected by a flexible connection to the rotor body at a point on the rotor disposed on one circumference with the rotation axes of the blades from the side of the large portions of these blades.
In addition, said flexible connection has a slack in the blade position with a zero deviation from the tangent to the rotor.
A comparative analysis of the essential features of the proposed solution, analogs and prototype testifies to its compliance with the criterion of "novelty".
The distinctive features of the claims are solved by the following functional tasks.
The sign "... the blades are asymmetrical relative to their turning axes ..." leads to the possibility of their rotation under the influence of the wind due to the formation of unequal parts of the blade area.
The sign "... the blades ... are mounted with the possibility of free rotation within ± 70 ° relative to the tangent to the rotor" ensures the operability of the structure, namely the active operation of the blades on most of the circumference of the rotor. To do this, it is sufficient to establish, for example, rigid stops on the axes.
The symptom "... the greater part of the asymmetric blade is made flexible or composite with the possibility of bending in the plane of rotation" makes it possible to provide an optimal geometry of the blade, create a "belly" and increase traction characteristics of the blade.
The signs "... the end of a larger section of each asymmetric blade is connected by a flexible connection to the rotor body at a point on the rotor located on one circle with the rotation axes of the blades from the side of the large sections of these blades" allow the blades to freely rotate to both sides within a certain angle, and With the increase of this angle, the connection stretches and holds the end of the greater part of the blade from further rotation, while the blade plane undergoes an elastic deformation under the influence of wind force.
The signs "... the flexible connection has a slack in the position of the blade with zero deviation from the tangent to the rotor" make it possible to ensure a free rotation of the blade within the specified angle, depending on the magnitude of this slack. This allows you to implement the stops when turning the blade and leads to an elastic bending of the flat blade, the formation of a "belly" and the improvement of traction characteristics.
The essence of the invention is explained by the drawing. The figure shows a top view of the wind turbine.
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The structure comprises a rotor 1 on which the legs 2 are fixed. The blades 3 are rotatably mounted thereon with respect to the posts 2, as with respect to the rotation axes. The blades 3 are asymmetrical with respect to the pivot axis. Most of each blade 3 is bendable in the plane of rotation. The end of most of each blade 3 is secured by means of a flexible cable 4 with the rotor body 1 from the side of the larger blade section. And the fixing point is located on one circle with the posts 2 (the axes of rotation of the blades 3). The positions of the blades 3 are indicated in Latin letters from a to h. |
The engine works as follows. Under the influence of the wind, all the blades 3 rotate and occupy a certain position, shown in the drawing in Latin letters. In this case, the blades 3 in the positions from a to e create a thrust to rotate the rotor 1 in the direction indicated by the arrow. In the interval between c and d, the blades 3 spontaneously freely move around their axes (racks 2) from one extreme position to the other. Blades 3 in the positions from f to h move towards the wind, they are automatically set to the inactive vane position and do not resist the rotation of the rotor 1. When the wind increases, the blades 3 in positions from a to e bend, their geometry becomes optimal, the rotor 1 torque increases, and Flexible cables 4 limit the rotation angles of the blades 3.
Thus, the proposed solution makes it possible to provide free rotation of the blades within a specified angle of ± 70 ° and an optimal geometry of the blade, which increases the traction characteristics of the blades.
CLAIM
A wind turbine comprising: a rotor mounted rotatably about a vertical axis; and rotatable blades mounted rotatably with respect to their vertical axes fixed to the rotor, characterized in that the blades are asymmetric with respect to their pivot axes and are freely rotatable in The angle of ± 70 ° relative to the tangent to the rotor.
2. The wind turbine according to claim 1, characterized in that the larger portion of the asymmetric blade is flexible or composite with the possibility of bending in the plane of rotation.
3. A wind turbine according to any one of the preceding claims, characterized in that the end of a larger portion of each asymmetric blade is connected by a flexible connection to the rotor body at a point on the rotor disposed on one circumference with the blade rotation axes from the side of the large portions of these blades.
4. The wind turbine according to claim 3, characterized in that said flexible connection has a slack in the blade position with zero deviation from the tangent to the rotor.
print version
Publication date 31.01.2007gg
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