CN101832226B - Lift and resistance composite wind-driven vertical shaft wind generator and wind wheel thereof - Google Patents

Abstract

The present invention relates to a vertical-axis wind power generator and its wind rotor, which is compounded by lift force and drag force, and its wind rotor. The cross-section of the arm is wedge-shaped with the large end being arc-shaped. The large end of the cross-section of the leaf arm points to the direction of the linear velocity of the leaf arm rotation. Each leaf arm is provided with more than one blade with a V-shaped cross-section along the length direction. The opening direction of each blade is towards the small end of the cross section of the blade arm, and the cross section of each blade is symmetrical with respect to the symmetry axis of the cross section of the blade arm. The power output shaft of the wind rotor of the wind generator of the present invention is provided with more than two blade arms, and the design of the cross section of the blade arms conforms to the design theory of the blade of the horizontal axis wind power generator, which can ensure the flow angle and chord length of the blade arms, The rotating wind resistance is small, and the efficiency of the wind-driven generator is high. Each blade arm is provided with two V-shaped blades, so that the starting performance of the wind-driven generator is better.

Description

Vertical-axis wind turbine and its rotor with composite wind motion of lift and drag

technical field

The invention relates to a wind power generator, and at the same time, the invention also relates to a wind wheel of the wind power generator.

Background technique

Humans have used wind energy for thousands of years. The construction of wind farms began in Denmark at the end of the 19th century. The earliest form of utilization of wind energy was the vertical axis windmill, but vertical axis wind turbines did not appear until the 1920s. With the development of lift-type wind rotors, the wind energy utilization rate of vertical axis wind turbines is no longer lower than that of horizontal axis. And compared with the horizontal axis wind generator, it has the advantages of convenient maintenance, simple design and manufacture of the wind wheel, low cost, and no need for wind-facing devices. The commonly used vertical axis wind turbines mainly include drag type and lift type. However, both have fatal weaknesses. For drag-type wind turbines, the low utilization rate of wind energy is an obstacle to the promotion of drag-type wind turbines; and lift-type wind turbines must be designed to provide the required power for the rotation of the wind rotor because of their poor start-up performance. The starting torque increases the complexity of the wind turbine structure.

Contents of the invention

The purpose of the present invention is to provide a vertical-axis wind-driven generator combined with lift and drag to overcome the low wind energy utilization rate of the drag-type vertical-axis wind-driven generator in the prior art and the start-up performance of the lift-type vertical-axis wind-driven generator In order to solve the poor problem, the present invention also provides the wind rotor of the wind power generator.

In order to achieve the above object, the wind wheel of the vertical-axis wind-driven generator with combined lift and resistance of the present invention adopts the following technical scheme: a wind wheel of a vertical-axis wind-driven generator with combined lift and resistance, the wind wheel includes For the power output shaft connected with the transmission of the generator set, one end of the power output shaft is provided with more than two cylindrical leaf arms uniformly distributed along the circumference. The large end of the cross-section of the vane points to the direction of the linear velocity of the blade arm rotation, and more than one blade with a V-shaped cross-section is arranged on each blade arm along the length direction, and the opening direction of each blade faces the small end of the cross-section of the blade arm. The cross section of each blade is symmetrical with respect to the axis of symmetry of the cross section of the blade arm.

The two or more leaf arms are radially arranged on the power output shaft.

One end of each leaf arm away from the power output shaft is free, and the free end of each leaf arm is provided with a safety rope connecting each leaf arm together to enhance the integrity of each leaf arm.

There are three leaf arms. the

There are two blades arranged on each blade arm.

The technical scheme of the vertical-axis wind-driven generator of lift and resistance composite wind of the present invention is as follows:

A vertical-axis wind-driven generator with combined lift and drag force, the generator includes a wind rotor, the wind rotor includes a power output shaft used for transmission connection with a generating set, one end of the power output shaft is provided with There are more than two columnar leaf arms of the cloth, the cross section of the leaf arm is wedge-shaped with the large end being arc-shaped, the large end of the cross section of the leaf arm points to the direction of the linear velocity of the leaf arm rotation, and each leaf arm is arranged along the length direction There are more than one blades with a V-shaped cross section, the opening direction of each blade faces the small end of the cross section of the blade arm, and the cross section of each blade is symmetrical to the symmetry axis of the cross section of the blade arm.

The two or more leaf arms are radially arranged on the power output shaft.

One end of each leaf arm away from the power output shaft is free, and the free end of each leaf arm is provided with a safety rope connecting each leaf arm together to enhance the integrity of each leaf arm.

There are three leaf arms.

There are two blades arranged on each blade arm.

The wind wheel of the vertical axis wind power generator with combined lift and resistance of the present invention is used to drive the power output shaft connected with the generating set, and more than two columnar blade arms uniformly distributed along the circumference are arranged on the power output shaft, and the cross section of the blade arms is The large end of the blade arm is wedge-shaped with an arc shape. The large end of the cross section of the blade arm points to the direction of the linear velocity of the blade arm. The cross section of the blade arm conforms to the design theory of the blade of the horizontal axis wind turbine, which can ensure the flow of the blade arm. The angle and chord are long, and the wind resistance is small when it rotates, so that the efficiency of the wind turbine is high. In addition, there are two V-shaped blades on each blade arm, so that the wind turbine can be used even when the wind speed is small. Start, the start performance of the wind turbine is better.

More than two blade arms are arranged on the power output shaft in a radial shape, which makes the entire wind rotor pyramid-shaped, and the power output shaft and the generator are at the top of the pyramid. In actual use, the pyramid-shaped wind rotor is top-down When installed, the entire wind rotor is in the shape of an "inverted pyramid". When the length of the blade arm is the same, compared with the columnar wind rotor, the overall center of gravity of the inverted "pyramid" wind rotor is lower, which enhances its strength and stability.

In the present invention, one end of each leaf arm away from the power output shaft is free, and the free end of each leaf arm is provided with a safety rope that connects each leaf arm together to enhance the integrity of each leaf arm. The safety rope makes the entire rotating body approximate a whole, The wind wheel has a good overall strength, which can meet the needs even when the wind speed is relatively high.

Description of drawings

Fig. 1 is a perspective view of an embodiment of the wind wheel of the present invention;

Fig. 2 is a top view of an embodiment of the wind wheel of the present invention;

Fig. 3 is a sectional view of the blade arm in Fig. 1;

Fig. 4 is A-A sectional view of Fig. 1;

Fig. 5 is a perspective view of an embodiment of the wind power generator of the present invention.

Detailed ways

In Figures 1 to 4, a wind rotor of a vertical-axis wind-driven generator with combined lift and drag force, the wind rotor includes a power output shaft 6, and one end of the power output shaft 6 is fixedly provided with a sheet-like connector 3, and Three leaf arms 1 uniformly distributed along the circumference are fixedly arranged on the sheet connector 3, and the cross section of the leaf arm 1 is wedge-shaped with a big head and an arc-shaped end, which can also be said to be a combination of a circle and an isosceles acute-angled triangle. The big end of the cross section of the leaf arm points to the direction of the linear velocity of the leaf arm rotation. The other end of the power output shaft 6 is used for connecting with the generator set for transmission. The three leaf arms are radially distributed, and each leaf arm forms a pyramid shape. Each leaf arm 1 is respectively provided with two blades 2 along the length direction. The cross section of the blade 2 is V-shaped, and the inner and outer corners of the V shape are Both are provided with a transitional arc, and the inner transitional arc fits closely with the arc shape of the big end of the cross section of the leaf arm, and the cross section of each blade is symmetrical to the symmetry axis of the cross section of the leaf arm. Each leaf arm is provided with a safety rope 5 that connects the three leaf arms together to enhance the integrity of each leaf arm. The safety rope is arranged on the end of the leaf arm away from the power output shaft and the part other than the two blades.

In Fig. 5, a vertical-axis wind power generator with combined lift and drag, including a wind rotor and a generator set connected to the power output shaft of the wind rotor, the wind rotor is the wind rotor in the above-mentioned Figs. 1-4 , the power output of the wind wheel extends into the generator set casing 4 and is connected with the generator set transmission arranged in the generator set casing 4 .

In this embodiment, there are three blade arms, or two or four.

In this embodiment, there are two, or one or three, blades arranged on each blade arm.

The leaf arm in this embodiment is arranged on the power output shaft through a sheet-shaped connecting piece, and may also be directly arranged on the power output shaft.

The safety rope of this embodiment is one, also can be two, and the setting position of one of them is the same as the position in this embodiment, and the other one is set at the position between the two blades on the leaf arm.

Because of the two V-shaped blades installed on each blade arm of this embodiment, the wind generator can be started even at a low wind speed. When the wind speed is high, due to the overall shape of the wind rotor in an "inverted pyramid" shape, coupled with the V-shaped design of each blade on the wind rotor, and two rows are distributed up and down, the upper row has a larger radius of rotation, which can ensure that the wind turbine On the premise of high rotation speed, it has good stability, thereby improving work efficiency. When the wind speed is too high, the ring-connected safety rope makes the entire rotating body approximate a whole, which has good overall strength. In addition, due to the overall "inverted pyramid" structure of the wind wheel, the overall center of gravity is lower, which further enhances its strength and stability.

The cross-section of the blade arm in this embodiment is designed to be wedge-shaped with a large end in an arc shape, and the blade arm constitutes a typical Darrieux type (lift type) wind rotor. Use safety ropes to connect the three blade arms above the wind wheel, and use hinges at the joints to ensure that the blade arms can operate well under the condition of elastic deformation during the rotation of the wind wheel, and have better flexibility. In addition, the wedge-shaped blade arm can make the wind wheel rotate with less resistance and have higher strength.

Two V-shaped blades are installed on each blade arm, and the installation position is determined according to the rated power of the wind turbine and the length of the blade arm. The blades fit closely with the blade arms. The matching method adopts bolt matching (not shown in the figure). The V-shaped blades evenly arranged on the main vein of the blade arm constitute a typical resistance type wind wheel. In this way, the ability of the overall composite wind wheel to collect wind energy is greatly improved, thereby improving the utilization rate of wind energy. A contraction device can also be provided on the design of each blade, and the opening angle of the V blade can be changed by adjusting the contraction device, so that the device can generate stable electric energy under different wind speeds. At the same time, damage to the wind rotor can also be avoided when the wind speed is too high.

Claims (10)

1. A wind rotor of a vertical-axis wind-driven generator driven by combined lift and resistance, characterized in that: the wind rotor includes a power output shaft for connecting with the generator set transmission, and one end of the power output shaft is provided with a More than two cylindrical leaf arms evenly distributed on the circumference. The cross section of the leaf arm is wedge-shaped with a large end in the shape of a circular arc. The large end of the cross section of the leaf arm points to the direction of the linear velocity of the leaf arm rotation. The length of the upper edge of each leaf arm is There are more than one blades with a V-shaped cross-section in the direction. The blades are closely matched with the blade arms. The opening direction of each blade is toward the small end of the cross-section of the blade arm. Symmetrical, the inner and outer corners of the V-shape of each blade are provided with a transition arc, the inner transition arc fits with the arc of the large end of the cross-section of the corresponding leaf arm, and the inner transition arc and the outer transition arc The wall thickness between them is greater than the wall thickness of the tip on both sides of the corresponding blade. 2 . The wind rotor according to claim 1 , wherein the two or more blade arms are radially arranged on the power output shaft. 3 . 3. The wind wheel according to claim 2, characterized in that: one end of each blade arm away from the power output shaft is free, and the free end of each blade arm is provided with a safety device for connecting each blade arm together to enhance the integrity of each blade arm. rope. 4. The wind wheel according to claim 3, characterized in that there are three blade arms. 5. The wind wheel according to any one of claims 1-4, characterized in that there are two blades arranged on each blade arm. 6. A vertical-axis wind-driven generator with combined lift and resistance, the generator includes a wind wheel, and it is characterized in that: the wind wheel includes a power output shaft for connecting with the generator set transmission, and the power output shaft One end is provided with more than two cylindrical leaf arms uniformly distributed along the circumference. The cross section of the leaf arm is wedge-shaped with the large end being arc-shaped. The large end of the cross section of the leaf arm points to the linear velocity direction of the leaf arm rotation. Each leaf The arm is provided with more than one blade with a V-shaped cross-section along the length direction. The blade and the blade arm are closely matched. The opening direction of each blade is toward the small end of the cross-section of the blade arm. The symmetry of the cross-section is axisymmetric. The inner and outer corners of the V-shape of each blade are provided with transition arcs. The wall thickness between the outer transition arcs is greater than the wall thickness of the two side tips of the corresponding blades. 7. The generator according to claim 6, characterized in that: the two or more blade arms are radially arranged on the power output shaft. 8. The generator according to claim 7, characterized in that: one end of each blade arm away from the power output shaft is free, and the free end of each blade arm is provided with a safety device for connecting each blade arm together to enhance the integrity of each blade arm. rope. 9. The generator according to claim 8, characterized in that there are three blade arms. 10. The generator according to any one of claims 6-10, characterized in that there are two blades arranged on each blade arm.

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