KR20110139811A - Vertical axis type wind power generator - Google Patents

Abstract

PURPOSE: A vertical axis type wind power generator is provided to prevent the reduction of thrust caused by rotational resistance by employing a rotary blade having an arc shape curved in the rotating direction. CONSTITUTION: A vertical axis type wind power generator comprises a plurality of connecting rods(120) which are vertical to a rotary shaft(110), 8~10 arc-shaped rotating blades(130) which are arranged symmetrically in the radial direction and supported by the connecting rods, a casing(140) which is installed in the rotary shaft and accommodates the rotary blades, and direction blades(141) which are formed on the exterior of the casing. The connecting rods and the top and bottom of the rotary blades are fixed to ring-shaped first and second fixing frames.

Description

Vertical axis type wind power generator

The present invention relates to a vertical axis type wind power generator, and more particularly to a vertical axis type wind power generator having a rotary wing structure that can obtain an effective power generation efficiency.

Since the oil shock in 1973, wind energy has emerged as an alternative energy source, and as the Kyoto Protocol came into effect in 2005, wind energy has been spotlighted as a clean energy source and economic feasibility. A long-term plan for replacing wind with wind energy was established.

Korea has also concentrated on solar and wind power generation through the development and use of renewable energy technology. In 2030, Korea announced a national energy plan to raise the level to 9%. In addition, many complexes have been constructed to produce electricity, but the type of wind power system applied here is a horizontal axis wind power generator, which requires the installation of a high-weight generator in the tower and the fact that it cannot be quickly repaired in case of failure. .

In Korea, since the climate change is severe and the wind speed is not constant, it is necessary to have a structure capable of converting intermittent wind energy irrespective of sudden changes in wind speed. Therefore, vertical axis wind turbines are more easily adapted to energy conversion and energy storage than horizontal axis wind turbines.

The inventor of the present invention has been applied for a domestic wind turbine for a stable power generation regardless of the wind direction or wind speed by research and development of the vertical axis wind power device for many years, and was registered with the patent number 776319 (registration date: 2007.11.07.) Patent application for a vertical axis wind power generator consisting of two or more blade units in Korea Patent Application No. 2007-136125 (application date: December 24, 2007).

The present invention is to improve the conventional vertical axis wind turbine further, to provide a vertical axis wind turbine generator that can obtain a higher power generation efficiency by the vertical axis wind turbine having a rotary blade and the casing of a specific shape.

In the vertical axis type wind power generator of the present invention is provided vertically comprises a rotary shaft driven by the wind and a generator connected to the rotary shaft to generate electricity, the vertical axis type wind power generator, at a right angle to the rotation axis A plurality of connecting rods provided; 8 to 10 arc-shaped rotating blades supported by the connecting rod and provided radially rotationally symmetrical; A casing installed rotatably on the rotating shaft to accommodate the rotating blade, the casing having a cylindrical shell shape in an angle range of 150 ° to 165 °; It may be provided by a directional wing provided on the outer side of the casing.

In addition, the vertical axis type wind turbine generator according to another aspect of the present invention is vertically provided in the vertical axis type wind turbine including a rotating shaft which is driven by the wind and a generator connected to the rotating shaft to generate electricity. A plurality of first connecting rods provided at right angles to the rotating shaft; A plurality of arc-shaped first rotating blades supported by the first connecting rod and provided in a radially symmetrical manner; A plurality of second connecting rods provided radially from the first connecting rod or the first rotary wing; A plurality of arc-shaped second rotating blades positioned outside the first rotating blade and supported by the second connecting rod to be radially symmetrical to each other; A casing installed rotatably on the rotating shaft to accommodate the first and second rotary vanes, the casing having a cylindrical shell shape in an angle range of 150 ° to 165 °; It may be provided by a direction blade provided on the outer side of the casing.

Wind turbine of the vertical axis type of the present invention has a specific type of rotor blade and casing can simplify the production without requiring a high technology for the production, such as airfoil of the horizontal axis, can increase the drag and lower the production cost It is an invention that has an effect.

1 is a view showing the main configuration of the main axis wind power generator of the present invention,
Figure 2 is a view showing the structure of the rotary blade in the wind power generator of the vertical axis method of the present invention,
3 is a view showing a preferred example of the casing in the vertical axis type wind power generator of the present invention,
Figure 4 (a) (b) is a planar configuration of the vertical axis type wind power generator of the present invention, a view showing another modification of the casing,
5 is a schematic view of an experimental apparatus for the present experiment,
Figure 6 (a) (b) is a view showing a casing used in this experiment,
Figure 7 (a) (b) (c) is a view showing the turbines used in this experiment,
8 to 16 are graphs showing data obtained in this experiment,
17 and 18 (a) (b) is a view showing a planar configuration of another embodiment of the wind power generator of the vertical axis type method.

As shown in FIG. 1, the vertical axis type wind power generator of the present invention includes a vertical axis type including a rotating shaft 110 that is vertically provided and driven by wind power, and a generator connected to the rotating axis to generate electricity. In the wind power generator, A plurality of connecting rods 120 provided at right angles to the rotating shaft 110; 8 to 10 arc-shaped rotary wings 130 supported by the connecting rod 120 and provided radially symmetrically; A casing 140 installed rotatably on the rotating shaft 110 to accommodate the rotating blade 130 and having a cylindrical shell shape having an angle range of 150 ° to 165 °; Characterized in that it consists of a direction wing 141 provided on the outer side of the casing.

2 is a view showing the structure of the rotor blades removed from the casing in the wind turbine generator of the vertical axis method of the present invention, the rotary shaft 110 is supported by a not shown support structure is provided to be rotatable, and also the rotary shaft ( 110 is connected to a known generator, the generator is operated by the rotational driving force of the rotating shaft to generate electricity.

The rotary shaft 110 is provided with a plurality of rotary blades 130, preferably each of the rotary blades to have a large force in the rotation direction by having a convex arc shape in the rotation direction.

In particular, in the vertical axis type wind turbine of the present invention, the rotary blade 130 is characterized in that between 8 to 10.

In addition, in the vertical axis type wind power generator of the present invention, the upper and lower ends of the rotary blades 130 are fixed to the fixed frame 150 of the circular ring shape, respectively, the fixed frame 150 is fixed to the connecting rod 150.

3 is a view showing a preferred example of the casing in the vertical axis type wind power generator of the present invention, the central axis of the casing 140, the bearing 142 is provided to be rotatably installed on the rotating shaft 110, the overall Has a cylindrical shell shape but has a semi-cylindrical shape cut in a range of angles.

The outer side of the casing 140 is provided with a direction blade 141 so that the casing 140 rotates in accordance with the direction of the wind.

Figure 4 (a) (b) is a view showing a planar configuration of the vertical axis type wind turbine of the present invention, the casing 140 in the wind turbine of the present invention has a substantially semi-cylindrical shape, preferably 150 It has a cylindrical shell shape with an angle range of ° to 165 °.

Experimental Example

Ⅰ. Experiment method

Figure 5 shows a schematic diagram of the experimental apparatus for the present experiment.

As shown in FIG. 5, the experimental apparatus has three parts, a mechanical structure, an electrical structure, and a wind tunnel device.

The mechanical part includes a casing (1) surrounding the rotor blades, a turbine consisting of the rotor blades (3) and the rotor (2), a shaft (4) connected to the rotor (2), and a timing provided at the bottom of the shaft (4). A pulley 5 and a timing belt 6 connecting the generator 7.

At the bottom of the casing 1, a bearing for rotating the casing 1 is installed.

The electric load used 10 5W bulbs and a switch was attached to each bulb to adjust the load.

The generator used a DC gear motor and the turbine speed was measured with a digital speedometer.

In this experimental example, a 180 ° semi-cylindrical casing (Fig. 6 (a)) and a 165 ° cylindrical casing (Fig. 6 (b)) were prepared and tested.

In addition, in the present experimental example, the turbine is selected in the form of fixing a large number of flat plates directly to the rotor as shown in FIG. 7 (a) (hereinafter referred to as "type A"), and as shown in FIG. The blade is not fixed and has a constant space in the center (hereinafter referred to as "B-type") (embodiment of the present invention) and the form in which a number of arc-shaped blades are directly fixed to the rotating shaft as shown in FIG. Hereinafter, "type C") was used as a reference.

The rotor blade size is 10 cm x 15 cm (A x 10 cm), type B is 5 cm x 15 cm, and type C is 10 cm x 15 cm. The rotation radius of the turbine was 15 cm.

Turbine output is obtained as the product of the generator's volts and amperes.

II. Experiment result and performance evaluation

Equation 1 used in the performance evaluation of each factor in the wind turbine generator attached to the casing is as shown in [Equation 1].

는 출력계수,

는 토크계수,

는 추력계수,

는 발전기 출력,

는 공기밀도,

는 회전날개의 투영면적,

는 풍속,

는 실제축 토크,

는 실체 추력,

은 축 중심에서 터빈 중심의 거리이다.
However, in [Equation 1] above

Is the output coefficient,

Is the torque factor,

Is the thrust factor,

Generator output,

Is the air density,

Is the projection area of the rotor blades,

Wind speed,

Is the actual shaft torque,

Is the real thrust,

Is the distance from the shaft center to the turbine center.

8 is a graph showing the relationship between the rotor blade shape and output relative to the wind speed, the turbine shape is the smallest starting wind speed and the highest output in the type B and the difference is larger than the type C, but the output tendency is similar to the type C Do.

That is, it turns out that the turbine of embodiment (B type) of this invention is superior to the turbine type of A type or C type.

9 is a graph showing the number of wings and the output relation to the wind speed, where 10 sheets show an output larger than 8 at the starting wind speed and the largest output as the wind speed increases, but 6 sheets, 8 sheets, and 10 sheets at a wind speed of 20 ㎧ are shown. There is a section that has similar values and tends to be lower than 8 sheets at the wind speed. This is regarded as a loss in the flow process between the wings in the airflow increase section with the increase of the wind speed.

FIG. 10 is a graph showing the relationship between the wing height and the output versus the wind speed, where the output is high and the starting wind speed is low at high height, but the output tendency is the same nonlinear trend regardless of the height. This is considered to be because the rotational resistance of the blades acts constantly.

Fig. 11 is a graph showing the relationship between the casing structure and the output for the wind speed, and the output when the 180 ° casing (Fig. 6 (a)) and the 165 ° casing (Fig. 6 (b)) are used with the same rotor blade height. Shows. The output was larger at 165 ° casing than at 180 ° casing, and there was a significant change in output size. Therefore, it can be seen that the flow phenomenon on the outlet side contributes to the output.

Fig. 12 is a graph showing the relationship between the torque and the rotational speed with respect to the wind speed, and shows the relation between the axial torque and the rotational speed with respect to the wind speed at 25 cm of the rotor blade height at 165 ° casing. The shaft torque tends to increase with the wind speed, and the rotational speed also increases, but the rotational speed shows a limit above the wind speed of 20㎧, but the torque continues to increase.

13 is a graph showing the relationship between the rotor blade height and the thrust for the wind speed, the thrust does not have a large difference between the height 25cm and 20cm, but the thrust is lower than the 180 ° casing in 165 ° casing, which is Figure 11 The output is related to the number of revolutions when the output shows that the 165 ° casing represents a value greater than the 180 ° casing. That is, the thrust is lowered while the number of revolutions is increased.

FIG. 14 is a graph showing the thrust coefficient and the output coefficient with respect to the wind speed, and the performance of the thrust coefficient, torque coefficient, and output coefficient experimented with a rotor blade height of 25 cm in a 165 ° casing is shown as a dimensionless coefficient. The thrust coefficient showed the same value as the torque coefficient, and its shape increased up to 17 풍속 of wind speed, but decreased thereafter, showing a nearly constant value at high wind speeds, and the maximum of thrust coefficient, torque coefficient, and wind speed, which are the maximum value of output coefficient, Appeared differently.

15 is a graph showing the output coefficient for the wind speed, showing the output coefficient for the rotor blade height.

The output coefficient increased with increasing rotor blade height and there was a significant difference in the turbine with 165 ° casing. In addition, the average output coefficients of all the wind speeds for the rotor blades were 0.09 at 15cm in height, 0.11 at 20cm in height, and 0.126 at 25cm in height in all sections excluding wind speed. The largest mean value was 0.14 at, and the output coefficient was 0.2 at the wind speed of 20㎧.

A comparison of the output coefficients of a 165 ° casing with a 180 ° casing with a rotor blade of the same height shows that the 165 ° casing is about 11% higher than the 180 ° casing.

16 is a graph showing the relationship between the peripheral speed ratio and the output, the smaller the rotor blade height, the output is generated in the section of the smaller peripheral speed ratio, at the rotor blade height 20cm, the peripheral speed ratio is 0.16 to 0.18 section, 165 ° casing rotary blade It can be seen that the maximum output is obtained at 0.26 at a height of 25 cm. Therefore, increasing the peripheral speed ratio has been shown to contribute to output improvement.

III. conclusion

It can be seen from the experiment of the present invention that the turbine shape in which the largest output is obtained is B type, and the number of wings is about 8 to 10 sheets.

In addition, it can be seen that the performance of the casing shape is larger than the 180 ° casing with the output and output coefficient of the 165 ° casing.

The output coefficient is 0.2 at the maximum of 165 ° casing and the average value is 0.14, about 11% higher than 180 ° casing.

Therefore, the turbine shape from the present experiment is preferably to prevent the thrust reduction by the rotational resistance is generated by the rotation blade is not fixed directly to the rotary shaft, the rotational resistance, the shape of the casing surrounding the rotary blade is approximately 165 ° angle It can be seen that it is desirable to have a cylindrical shell shape in the range of about 150 ° to 165 ° which is below.

17 is a view showing another embodiment of the wind power generator of the vertical axis method.

Referring to Figure 17, the vertical axis type wind turbine generator according to another embodiment of the present invention is provided with a vertically rotated rotation shaft 210 is driven by the wind and the generator is connected to the rotary shaft 210 to generate electricity In the vertical axis type wind turbine comprising: a plurality of first connecting rods 220 provided at right angles to the rotating shaft (210); A plurality of arc-shaped first rotating blades 230 supported by the first connecting rod 220 and provided in rotational symmetry; A plurality of second connection rods 240 provided radially from the first connection rod or the first rotary wing; A plurality of arc-shaped second rotating blades 250 positioned outside the first rotating blades 230 and supported by the second connecting rods so as to be radially symmetrical with each other; A casing 260 installed rotatably on the rotating shaft to accommodate the first and second rotary vanes, the casing having a cylindrical shell shape in an angle range of 150 ° to 165 °; Characterized in that it consists of a direction blade 261 provided on the outer side of the casing.

In particular, in the wind power generator according to another embodiment of the present invention, the first rotary blade 230 is characterized in that provided at the outer side than at least 1 / 2R or 1 / 2R with respect to the total rotation radius (R). .

For reference, FIG. 17 shows a turbine structure having rotary blades at 1 / 2R, 3 / 4R, and R positions, respectively, for the entire radius of rotation (R).

As described in Figure 2, the rotary blades are fixed by the fixed frame 231, 251 of the upper and lower ends of the circular ring shape, respectively, the connecting rods 220, 240 is between the fixed frame (231, 251) It is provided to support the entire turbine.

18 (a) (b) is a plan view and a longitudinal cross-sectional view showing a wind power generator according to another embodiment of the present invention, the rotating shaft 310 is provided with a plurality of connection rods 320 are rotationally symmetrical at right angles, Each connecting rod 320 may be provided with a plurality of rotary blades.

The connecting rod 320 is provided at the top and bottom of the rotary blade, respectively, the rotary blade is fixed.

18 (a) and (b), as in the embodiment of FIG. 17, the rotary blades have the first, second, and third rotary wings 331, 332, and 333 of 1 / 2R from the innermost side of the connecting rod 320. It is preferable to be provided in 3 / 4R and R position, respectively.

For reference, although not shown in Fig. 18 (a) (b), the 150 ° ~ 165 ° casing described in the above embodiment is equally applied.

110: rotating shaft 120: connecting rod
130: rotary blade 140: casing
141: direction wing

Claims (5)

In the vertical axis type wind turbine including a rotating shaft which is provided to be vertically driven by the wind and a generator connected to the rotating shaft to generate electricity,
A plurality of connection rods provided at right angles to the rotation shaft;
8 to 10 arc-shaped rotating blades supported by the connecting rod and provided radially rotationally symmetrical;
A casing installed rotatably on the rotating shaft to accommodate the rotating blade, the casing having a cylindrical shell shape in an angle range of 150 ° to 165 °;
The vertical axis type wind turbine generator, characterized in that composed of a direction blade provided on the outside of the casing. The wind turbine according to claim 1, wherein the rotary blades are fixed to upper and lower ends of the first and second fixed frames having a circular ring shape, and the connection rods are fixed to the first and second fixed frames. . In the vertical axis type wind turbine including a rotating shaft which is provided to be vertically driven by the wind and a generator connected to the rotating shaft to generate electricity,
A plurality of first connection rods provided at right angles to the rotation shaft;
A plurality of arc-shaped first rotating blades supported by the first connecting rod and provided in a radially symmetrical manner;
A plurality of second connecting rods provided radially from the first connecting rod or the first rotary wing;
A plurality of arc-shaped second rotating blades positioned outside the first rotating blade and supported by the second connecting rod to be radially symmetrical to each other;
A casing installed rotatably on the rotating shaft to accommodate the first and second rotary vanes, the casing having a cylindrical shell shape in an angle range of 150 ° to 165 °;
The vertical axis type wind turbine generator, characterized in that composed of a direction blade provided on the outside of the casing. The vertical axis wind turbine according to claim 3, wherein the first rotary blade is provided at an outer side of at least 1 / 2R or 1 / 2R with respect to the entire rotation radius (R). The wind turbine generator of claim 3, wherein the first and second rotary vanes are fixed to upper and lower ends of the fixed frame having a circular ring shape, and the connecting rod is fixed to the fixed frame.

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