KR20090051669A - Wind-collecting type windmill for wind power generation - Google Patents

Abstract

The present invention relates to a windmill for wind power generation, and more particularly to a wind turbine for high efficiency vertical axis wind power generation that can increase the amount of wind by inducing the wind in the blade direction.

Wind turbine for wind power generation of the present invention is to be formed in a vertically formed rotary shaft rotatably installed, a plurality of supports radially formed on the outer circumferential surface of the rotating shaft, and the supports are formed in a streamlined air foil shape, The outward surface facing outward with respect to the rotation axis is provided on at least one side of a plurality of blades having a cut-off portion formed so that lift is generated and a drag is generated against the wind at one side of the inward facing direction with respect to the rotation axis, It is provided with a wind induction means for inducing wind in the blade direction.

According to the wind turbine for wind power generation of the present invention, since the wind volume of the wind blowing through the blades is increased, the blades can be easily started even at low wind speeds, thereby improving power generation efficiency in a wide range of wind speeds.

Windmill, shroud, wind induction, vertical axis, wind

Description

Wind-collecting type windmill for wind power generation

The present invention relates to a windmill for wind power generation, and more particularly to a wind turbine for high efficiency vertical axis wind power generation that can increase the amount of wind by inducing the wind in the blade direction.

In general, windmills rotate propellers by natural winds, which are converted to electrical power generation by rotating the generators by increasing the speed using gear mechanisms.

Such a method is called wind power generation. Wind turbines for horizontal generation are known as horizontal axis windmills whose axis of rotation is horizontal with respect to wind represented by Dutch windmills, and vertical axis windmills whose axis of rotation is perpendicular to wind.

Among them, vertical axis windmills are drag type that rotates the windmill by drag generated on blades such as paddle type or savonius type and lift type that rotates the windmill by lifting force generated on blades such as Darius type or Shilomill type. It is known from Japanese Patent Laid-Open No. 54-153944.

That is, the former rotates the windmill by the drag difference by reducing the resistance of the blade toward the blow-up side, while the latter rotates the windmill by the lift force generated in the blade.

However, in the case of the vertical (electron type), when the main speed ratio (blade's air foil end speed / wind speed) is 1, there is no moment to rotate the windmill further, so even if the wind speed rises, the rotation speed may be higher. There was a problem that the power generation efficiency was poor.

On the other hand, in the latter case (lift type), the aerodynamic characteristics of the windmill are improved and the windmill can be efficiently rotated when the circumferential ratio is 1 or more, but the aerodynamic characteristics of the windmill are deteriorated when the circumferential ratio is 1 or less, and the moment of rotating the windmill becomes small. . In addition, there is a drawback that the starting moment is small and the starting from the stop state becomes very difficult.

Therefore, a strong wind is required to increase the power generation efficiency of the windmill. For this reason, a conventional windmill is installed along a coastline or a place where a lot of wind is required, such as using a high terrain such as a mountain or a ground. In addition, such a windmill has a large body size in proportion to the power generation capacity to be obtained. Accordingly, as the propeller of the windmill grows, the height of the whole body is formed high from the ground to receive a lot of wind.

Such a conventional wind turbine for wind power can obtain a large amount of power only when its size is enlarged. Therefore, the installation work is difficult due to the circumstances of the installation of the windmill. There is a growing problem.

In addition, due to such a problem, the noise is loud and requires a large wind speed at the start, the blade is not suitable for urban type because the blade does not rotate well due to the fluctuating wind in the city center.

The present invention has been made to improve the above problems, to provide a windmill-type windmill that efficiently generates power in a wide range of wind speed by increasing the amount of wind by inducing wind to the blade whose shape is changed to increase the efficiency of wind The purpose is.

Another object of the present invention is to provide an urban windmill that is easy to maneuver even at a small wind speed, and excellent in power generation efficiency even in a city with high fluctuations in wind direction.

Wind turbine for wind power generation of the present invention for achieving the above object is a vertically formed rotating shaft rotatably; Support members formed radially on the outer circumferential surface of the rotation shaft; Each of which is fixed to the supports and formed in a streamlined airfoil shape, the outwardly facing outward with respect to the rotation axis is lifted and the one side of the inwardly facing inward with respect to the rotation axis is restrained to generate drag against the wind A plurality of blades formed additionally; And wind induction means installed on at least one side of the blade above or below the blade to guide the wind in the direction of the blade.

 The wind guide means is supported by a support frame and is provided with a plate installed above or below the blade, characterized in that it comprises a shroud inclined along the edge of the plate.

 The plate or shroud is characterized in that the advertisement display unit is formed.

The solar cell is attached to the plate or the shroud, characterized in that it further comprises a solar cell for generating electrical energy using sunlight.

As described above, according to the wind turbine for wind power generation of the present invention, the wind blowing to the blades of the windmill by the shrouds installed above and below the blades guides the blades to increase the air volume, thereby easily starting the blades even at low wind speeds. Power generation efficiency can be increased in the wind speed range.

In addition, wind power can be generated by rotating the blade regardless of the wind direction, and solar power can be installed by installing solar cells, which provides the advantage of generating power even in a city with very low wind speed or large fluctuations in wind direction.

In addition, if the windmill of the present invention has the same power generation efficiency as the conventional windmill without the wind induction means, the size of the blade can be relatively reduced, so that the windmill can be miniaturized and can be installed in places where the wind speed is low or narrow. It offers the advantage of freedom of choice.

Hereinafter, with reference to the accompanying drawings will be described in detail for a wind turbine for wind power according to an embodiment of the present invention.

1 is an exploded perspective view showing a windmill for generating wind power according to an embodiment of the present invention, Figure 2 is a side view of FIG.

1 and 2, the wind turbine for wind power generation of the present invention is a vertical axis windmill in which the rotating shaft 30 on which the blades 20 are installed is formed perpendicular to the ground, and the movement of the blades 20 rotated by the wind power. It is used in wind power generators that convert energy into electrical energy.

Windmill according to an embodiment of the present invention is largely a rotating shaft 30, the support 40 formed in a plurality of radially on the outer circumferential surface of the rotating shaft 30, the blades 20 fixed to the support 40, respectively, It has a wind induction means 70 for inducing wind in the blade direction.

The rotating shaft 30 is vertically formed upwardly with respect to the ground, and the lower portion of the rotating shaft 30 is connected to a power generator for converting kinetic energy into electrical energy.

On the outer circumferential surfaces of the upper and lower portions of the rotary shaft 30, a plurality of supports 40 are formed extending in a direction orthogonal to the rotary shaft.

The blades 20 are respectively provided at the ends of the four supports 40 along the circumferential direction of the same radius in the plane orthogonal to the rotation axis 30. The blade 20 is formed by pressing a thin plate-shaped material made of a metal material such as aluminum alloy, or extrusion molding using a resin.

The blade 20 is formed in a streamlined air foil type used in an airplane represented by a four-magnetic field air foil type, RAF air foil type, gettingen air foil type, etc., inwardly facing the rotation axis 30 (B) ), An ablation portion 25 is formed. The ablation section 25 is formed by cutting over the trailing edge b at a position between 35% and 45% from the leading edge a. As a result, the blade 20 is formed into an air foil type that has a high lift coefficient with a low Reynolds number.

Around the blade 20 having the above structure, a pressure distribution is formed against the wind from the front (arrow C direction in FIG. 4) as shown in FIG. That is, the pressure distribution of the air foil type used for the blade 20 has a pressure higher than the outside air pressure in the front portion (wind blowing direction) of the blade 20 inward surface, and the outside portion has an approximately outside air pressure. The pressure is the same, and since the flow velocity is accelerated by the shape of the air foil on the outward surface, the pressure decreases and negative pressure is formed. Therefore, even if the cut-out part 25 is provided in the back of the inward face of the blade 2, the aerodynamic characteristics of the air foil are small.

As shown in FIG. 4, when the blade 20 receives wind from the front side (the arrow C direction in the drawing), the lift force is generated in the L arrow direction in the drawing. Thereby, the windmill by the blades 20, the rotational direction component force (L ₁₎ of the lift generated on is rotated in a clockwise direction.

In addition, in the low wind speed region as in the start-up, when the blade 20 rotates with the wind from the rear side (in the direction of arrow D in the drawing), the blade 20 is cut by the cutout portion 25 on the lower surface of the air foil. 20) large air resistance occurs. As a result, a rotation moment is generated in the blade 20 by the Savonius windmill effect, that is, the air resistance, thereby generating the starting torque of the windmill.

As a result, since the cutout part 25 is formed in the inward surface of the blade 20, a rotation moment is generated by air resistance in the low wind speed area | region of 1 or less of circumference ratios with respect to the wind from the D arrow direction of FIG. .

Then, the moment is applied to the rotational direction component force L1 of the lifting force generated in the blade 20 which receives the wind from the arrow C of FIG. 4, and rotates, and the blade 20 is generated in the high wind speed region having a circumferential ratio of 1 or more. It is rotated by the lifting force. That is, since the blade 20 is formed in an air foil type having a high lift coefficient with a low Reynolds number, the blade 20 can be rotated even at a low wind speed of 1 m / sec or less, so that the blade 20 can be efficiently developed. Moreover, since the blade 20 uses lightweight members, such as an aluminum alloy, the weight of the whole blade 20 becomes small and the load by the centrifugal force generate | occur | produced in the blade 20 reduces.

In the above embodiment, the ablation portion 25 is formed on the inward surface of the blade 20. However, since the blade type having a high lift coefficient is used because of the low Reynolds number, the blade 20 has air resistance and lift force due to wind. Is generated to rotate the blade 20 by these forces. Therefore, the blade 20 can generate the rotation moment necessary for power generation in any wind direction and wind speed. As a result, the blade 20 can be rotated over a wide range of wind speeds.

In addition, since four blades 20 are disposed around the rotational shaft 30, the blades 20 can be efficiently rotated against the wind from all directions, thereby rotating the blades for all the wind directions regardless of the wind direction. As it is possible to generate electricity, it can be installed in the city center where the wind direction is volatile.

In addition, although the four blades 20 are arranged in the above embodiment, the present invention is not limited thereto, and three or less blades or five or more blades may be used, and the same effects and effects as those of the above embodiments can be achieved. .

In addition, although not shown, it is also possible to attach a tip cover for reducing air resistance to the blade 20 at both ends, or to attach winglets for reducing the induction effect of the blade 20 as necessary.

In addition, when the blade 20 is initially started in a stationary state and rotates at a constant speed or more, the inward surface B becomes more than a predetermined speed to reduce the resistance of the air due to the vortex generated in the ablation section 25. It may have a structure in close contact with the outward surface (A) side.

This forms a blade 20 having the shape shown above using two sheets of plate material, the two sheets of plate material are connected so as to be rotatable with each other at the leading edge (a) of the blade 20. And the front end of the support 40 is penetrated through the inward surface (B) of the blade 20 is fixedly connected to the outward surface (A). In this case, the diameter of the through hole of the inward surface B through which the support penetrates is made larger than the diameter of the support 40 so that the inward surface moves along the longitudinal direction of the support, and can rotate at an angle with respect to the outward surface A. Do it. And the support between the inward surface (B) and the outward surface (A) is provided with springs connected at both ends to the outward surface (A) and the inward surface (B) respectively to elastically bias the inward surface (B) in the direction of the rotation axis. In this case, the elastic force of the spring is set to be smaller than the centrifugal force acting on the inward surface when the blade 20 rotates at a predetermined speed or more. Therefore, when the blade 20 is stopped or below a certain speed, the tip of the inwardly facing surface B is spaced apart from the outwardly facing surface A by a certain distance, but the centrifugal force is higher than the elastic force of the spring acting on the inwardly facing surface B above a certain speed. As a result, the tip of the inwardly facing surface B is brought into close contact with the outwardly facing surface A, thereby greatly reducing the resistance of air due to vortices.

As the wind induction means 70, the circular upper plate 71 installed above the blade 20 and the upper portion formed to be inclined along the edge of the upper plate 71 to induce wind toward the blade 20. The shroud 73 is provided. The lower plate 77 and the lower shroud 79 having the same structure as above are provided below the blade 20.

In addition to the wind guide means 70, the plate and the shroud may be installed only on either side of the blade 20 above or below.

Meanwhile, as shown in FIGS. 6 and 7, the shapes of the plates 81 and 85 may be formed not only circular but also rectangular and octagonal, and may also be variously formed into a polygon or oval of a triangle or a hexagon. Can be. The shrouds 83 and 87 may also be formed in various shapes according to the shapes of the plates 81 and 85.

And the upper plate 71 is coupled to be fixed to the upper end of the rotary shaft 30, in this case the flange 85 is mounted on the inner side of the bearing 81 in the rotary shaft 30, the flange 85 is the upper The plate 71 is fixed in the center by a fastening member such as a screw or bolt or welding. And the lower plate 77 is installed to be supported on the ground or structure.

In addition, as shown in FIG. 5, the upper and lower plates 71 and 77 may be supported by a plurality of support frames 60 formed perpendicularly to the outside of the rotation radius of the blade 20. In this case, the horizontal bar 65 interconnecting the support frame 60 in the horizontal direction is installed on the upper and lower sides to prevent safety accidents due to the detachment of the blade 20. And, between the support frame 60 may be further provided with a network member (not shown) formed with a plurality of through holes.

The radius of the upper and lower plates 71 and 77 is preferably larger than the radius of rotation of the blade 20.

And the upper shroud 73 is formed at the edge of the upper plate 71 extends a predetermined distance upwards, but extends in the direction in which the outer diameter of the upper plate 71 is extended to form a slope.

For the efficient use of wind, the inclination angle is preferably 120 to 150 °, in particular 135 ° with respect to the upper plate 71.

As shown in FIG. 2 by the wind induction means 70 having the above structure, the wind passing upward and downward of the blade 20 is directed to the blade 20 side, whereby the wind induction means 70 is not installed. Air volume of up to 20 to 30% is increased than that can greatly improve the power generation efficiency using wind power.

The wind guidance means 70 guides the wind blowing from all directions toward the blade 20 to increase the air volume, thereby facilitating the start of the blade 20 even at a low speed, thereby efficiently moving the blade 20 over a wide range of wind speed ranges. Can be rotated.

In particular, the windmill 10 of the present invention having the wind induction means 70 can rotate the blade 20 even at a low speed, and when the same power generation efficiency can be relatively reduced in size of the blade 20, miniaturization It also offers the advantage of a wide choice of installation locations. Therefore, it can be used for general homes or buildings in inland areas, lowlands, and cities with low winds.

In addition, an advertisement display unit 75 may be provided on the lower surface of the front or lower plate of the upper shroud 73 to be used as a billboard. In particular, in the advertisement display unit of the upper shroud 73, the upper shroud 73 may be configured to rotate slowly so that the advertisement can be viewed in various directions.

In addition, the plate 71, 77 and the shroud (73) (79) of the windmill of the present invention by installing a solar cell 90 for generating electrical energy by using the solar light and the solar power generation along with the wind power generation By making it possible, the power generation efficiency can be increased and power can be generated even when there is no or very low wind speed. In this case, the solar cell is disposed on all or one of the upper surface of the upper plate 71 to which sunlight is irradiated, the inner surface of the upper shroud 73, the upper surface of the lower plate 77, and the outer surface of the lower shroud 79. Is installed.

Meanwhile, components not described above in the embodiments illustrated in FIG. 5 are the same as the embodiments illustrated in FIG. 1, and thus detailed descriptions thereof will be omitted.

 Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments thereof are possible.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1 is an exploded perspective view showing a windmill for wind power generation according to an embodiment of the present invention;

2 is a side view of FIG. 1,

3 is a cross-sectional view showing the pressure distribution around the blade applied in FIG.

4 is a view showing a rotation operation of the blade applied to FIG.

5 is an exploded perspective view showing a windmill for generating wind power according to another embodiment of the present invention;

6 and 7 are perspective views showing an upper plate and a shroud applied to the windmill according to still another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

20: blade 25: ablation

30: axis of rotation 40: support

70: wind guide means 71: upper plate

73: upper shroud 75: advertising display

Claims (4)

In the vertical axis wind turbine, A rotating shaft vertically formed and rotatably installed; Support members formed radially on the outer circumferential surface of the rotation shaft; Each of which is fixed to the supports and formed in a streamlined airfoil shape, the outwardly facing outward with respect to the rotation axis is lifted and the one side of the inwardly facing inward with respect to the rotation axis is restrained to generate drag against the wind A plurality of blades formed additionally; Wind turbines for wind power generation, characterized in that it is provided on at least one side of the blade above or below the wind induction means for inducing wind in the blade direction. The wind turbine according to claim 1, wherein the wind guide means includes a plate which is supported by a support frame and installed above or below the blade, and a shroud that is inclined along an edge of the plate. Windmill. The wind turbine of claim 2, wherein an advertisement display unit is formed on the plate or the shroud. The windmill of claim 2, further comprising a solar cell attached to the plate or the shroud to generate electrical energy using sunlight.

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