JP2006132515A - Straight wing vertical shaft type wind mill for wind power generation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce phenomena in which force applied to a wing instantaneously differs and rotation energy of a straight wing vertical shaft type wind mill fluctuates depending on amount of wind velocity fluctuation of natural wind by the arrangement of wings. <P>SOLUTION: Length of the conventional wing is divided into small parts having length of 1/2 or more, these small parts are divided into upper and lower parts, and the wings are arranged by deviating positions of the wings from each other at each step. Consequently, since influence force of the wing received from natural wind differs depending on step, well-balanced rotation force is obtained on the whole and rotation of the wind mill is made smooth. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

Detailed Description of the Invention

The present invention relates to a straight blade vertical axis wind turbine for wind power generation, and particularly a wind turbine focused on improving blade arrangement.

In general, there are two types of wind turbines for wind power generation: a horizontal axis type wind turbine whose rotation axis is horizontal to the wind, and a vertical axis whose rotation axis is perpendicular to the wind. Axial wind turbines are known.

The vertical axis type windmill does not require an azimuth control mechanism and can rotate without considering the wind direction.

The vertical axis type windmill has a drag type that rotates by the drag generated on the wings like Savonius type and paddle type windmills, and it has the same cross section as an airplane wing like a straight wing type and Darius type windmill and rotates by lift force Lift form is known.

The drag-type wind turbine does not have a peripheral speed ratio (blade tip speed ÷ wind speed) of 1 or more, but when the lift-type wind turbine starts to rotate, the peripheral speed ratio becomes 1 or more, and the rotational torque has high aerodynamic characteristics. Generally, it has the feature that the number of rotations is higher than the former.

JP 2003-314429 A JP 2004-108330 A JP 2004-270578 A

Problems to be solved by the invention

5, 6, and 7 are perspective views modeling a general conventional straight blade vertical axis wind turbine, and FIGS. 8, 9, and 10 are plan views as viewed from above.
Patent Document 1 describes a three-blade vertical axis type windmill, which describes a structural mode related to blade retention in order to make the rotor lighter and cheaper, Patent Document 2 describes improvement of the shape of the blade itself, and Patent Document 3 describes The description of wind power generators using batteries that can be used together with external power is described, but the arrangement of the wings in these documents is the same as the conventional pattern in FIGS. Further, the arrangement of the blades of a vertical axis type wind turbine that is generally commercially available belongs to one of FIGS. 5, 6, and 7.
5 includes three blades 200, a rotating shaft 201, an arm 202 that transmits the rotational energy of the blades 200 to the rotating shaft 201, and a generator 300. The three blades 200 are 120 degrees from FIG. Arranged at an angle. 6 and 7, the wings 200 have four and five blades, and the wings 200 are arranged at an equal angle of 90 degrees and 72 degrees from FIGS. 9 and 10, respectively.

5, 6, and 7, the conventional straight blade vertical axis wind turbine may receive strong wind force or may be weak due to the timing of the relative flow of natural wind and the positional relationship between the blades 200. Sometimes it receives wind power. As a result, the rotational energy fluctuates due to fluctuations in the force applied to the blades of the windmill, resulting in problems such as uneven rotation speed and reduced efficiency.

Means for solving the problem

In order to solve the above problems, the blades of a straight blade vertical axis type wind turbine are divided into two or more stages in the vertical direction, the number of blades in each stage is two or more, and the arrangement of the blades in each stage is equiangular To do. Furthermore, the positional relationship of the blades at each stage is the method described in claim 2, and the object is to disperse the wind energy by shifting the rotor blade part for each stage and suppress the fluctuation of rotation as much as possible.

As the number of stages is increased from two to three, more energy is applied to one blade compared to the conventional one, and the entire blade is applied with a force in a balanced direction. Becomes smoother.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the explanation, since the energy of the flow velocity is proportional to the area through which the wind passes, it is assumed that the area is constant and the height of the blade and the radius of rotation are the same.

1, 2, 3, and 4 are perspective views showing the positional relationship of the wing according to the present invention, and plan views of the blades as viewed from above are FIGS. 11, 12, 13, and 14. is there.

The blade length in FIG. 1 is ½ of the length of the conventional three-blade 200 in FIG. 5, which is divided into two upper and lower stages. As shown in FIG. 11, the lower three blades 2 in FIG. 1 are arranged at an equal angle of 120 degrees, the upper three blades 1 are arranged so as to be in the middle of the lower blade 2, and the blade 1 is also Each is arranged at an equal angle of 120 degrees.

The blade length in FIG. 2 is ½ of the length of the conventional four-blade 200 in FIG. 6, and it is divided into two upper and lower stages. As shown in FIG. 12, the lower four blades 2 in FIG. 2 are arranged at an equal angle of 90 degrees, and the upper four blades 1 are arranged so as to be in the middle of the lower blade 2. Are arranged at an equal angle of 90 degrees.

The blade length in FIG. 3 is ½ of the length of the conventional five-blade 200 in FIG. 7 and is divided into two upper and lower stages. As shown in FIG. 13, the lower five blades 2 in FIG. 3 are arranged at an equal angle of 72 degrees, and the upper five blades 1 are arranged so as to be in the middle of the lower blade 2. Are also arranged at an equal angle of 72 degrees.

The blade length in FIG. 4 is a representative view in which the length of each of the three blades 200 in FIG. 5 is set to 1/3 and divided into upper, middle, and lower three stages. The lower three wings 102 are arranged at an equal angle of 120 degrees, the middle three wings 101 are arranged by shifting 40 degrees, which is 1/3 of 120 degrees, from the lower wing, and the upper wings 100 is arranged by shifting 40 degrees from the middle wing. The center angle between the middle and upper blades is the same as the lower blade angle, and each is arranged at an equal angle of 120 degrees. FIG. 14 is a plan view of FIG. 4 as viewed from above, and the wings are arranged at equal angles by 40 degrees.

Assuming that the arrangement of the lower wing 2 in FIG. 1 and the arrangement of the wing 200 in FIG. 5 are the same with respect to the wind, the influence of the wing 2 from natural wind is less than that of the wing 200. It becomes small because it is 1/2. Therefore, when a large force is instantaneously applied to the wing, the lower wing 2 needs a smaller force than the wing 200. Further, since the upper wing 1 is arranged differently from the lower wing 2, the lower wing 2 is not affected as much as the lower wing 2. On the contrary, when a weak wind is momentarily applied to the wing 2, the wing 1 is blown by the wind higher than the wing 2, and the wing 2 and the wing 1 are operated in reverse to the influence of the wind. As a result, the wind turbine rotates smoothly as a whole.
The above-described effect also appears in the case of the two-stage four-blade of FIG. 2 and the two-stage five-blade of FIG.
The arrangement of the three wings in FIG. 4 makes the rotation even smoother due to the principle of the two-stage wing arrangement described above.

The invention's effect

When the blades are arranged in two or more stages according to the principle of the present invention, the influence of wind is different for each stage, so that fluctuations in wind power can be suppressed as a whole. As a result, the rotation of the windmill was smoothed and the number of rotations was higher than the conventional method from the experimental results.

Furthermore, in the three-stage type in which the length of the conventional blade is 1/3, the number of rotations is higher than that in the two-stage type and the efficiency is also increased.

It is a perspective view of the two-stage three-sheet straight blade vertical axis type windmill in the present invention. 1 is a perspective view of a two-stage four-blade vertical axis wind turbine according to the present invention. 1 is a perspective view of a two-stage five-blade vertical axis wind turbine according to the present invention. 1 is a perspective view of a three-stage three-blade vertical axis vertical wind turbine according to the present invention. It is a perspective view of a conventional one-stage three-sheet straight blade vertical axis wind turbine. It is a perspective view of a conventional one-stage four-line straight blade vertical axis type wind turbine. It is a perspective view of a conventional one-stage five-blade vertical axis wind turbine. It is a top view of the 1 step | paragraph 3 straight blade | wing vertical axis type windmill which looked at from the top. It is a top view of the 1 step | paragraph 4 straight blade | wing vertical axis type windmill which looked at from the top. It is a top view of the 1 step | paragraph 5 straight blade | wing vertical axis type windmill which looked at from the top. FIG. 2 is a plan view of a two-stage three-line straight-blade vertical axis wind turbine as viewed from above. FIG. 2 is a plan view of a two-stage four-blade vertical axis wind turbine as viewed from above. FIG. 2 is a plan view of a two-stage five-blade vertical axis wind turbine viewed from above. FIG. 2 is a plan view of a two-stage four-blade vertical axis wind turbine as viewed from above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Two-stage type upper stage wing in this invention 2 Two-stage type lower stage wing in this invention 3 Windmill rotating shaft 4 Arm 5 Blade trajectory 100 Three-stage upper stage wing 101 in this invention Three stages in this invention Middle stage side blade 102 Three-stage lower stage blade 103 of the present invention Wind turbine rotating shaft 104 Arm 105 Blade track 200 Conventional blade 201 Wind turbine rotating shaft 202 Arm 203 Blade track 300 Generator

Claims (2)

In a wind turbine for wind power generation in which a plurality of straight blades are provided at equal angles around the rotation axis in a plane perpendicular to the vertical rotation shaft, the straight blades are divided into two or more stages in the vertical direction, A wind turbine for wind power generation, characterized by shifting the arrangement in a certain direction. When straight wings are arranged in N-stage M wings, when the central angle between the wings and the wings in the stage is θ, each angle can be determined by θ = 360 ° ÷ M. The wind turbine for wind power generation according to claim 1, wherein the deviation angle α is α = (I−1) × θ ÷ N in the I-th stage from the lower stage.

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