KR101455900B1 - Vertical-axis wind power generator having mechanism for angle variation of wings - Google Patents

Abstract

The present invention provides a vertical axis wind power generator in which the angle of the wing with respect to the ground is automatically adjusted between vertical and horizontal as the wing rotates.
In the vertical axis wind power generator of the present invention, the up-down weight is additionally provided on the means for connecting the wing and the vertical rotation shaft, and a rail for displacing the up-down weight at a predetermined interval is provided at the top of the tower. The angle of the wing automatically changes according to the displacement of the up-down weight.
The present invention can be applied to a vertical axis wind power generator because it can increase the size of a wing while minimizing the resistance to reverse wind.

Description

{Vertical-axis wind power generator having mechanism for angle variation of wings}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical axis wind power generator having a structure for varying a blade angle and more particularly to a vertical axis wind power generator capable of improving power generation efficiency by automatically changing a swirling area as the wing rotates about a vertical rotation axis .

Wind power generation is attracting attention as an environmentally sustainable renewable energy source that can replace fossil fuels with solar power generation. Wind power technology uses the aerodynamic characteristics of the kinetic energy of the air flow to convert the rotor into mechanical energy and obtain electrical energy from the mechanical energy.

Wind turbines are classified as horizontal axis wind turbine and vertical axis wind turbine depending on the direction of the axis of rotation about the ground. Since the vertical axis wind power generator can be installed regardless of the direction of the wind, unlike the horizontal axis wind power generator, there is a favorable aspect in the region where the wind direction is not constant due to the influence of the monsoon wind as in our country.

In order to increase the size of the wind turbine, the sectional area of the wing (wind area) must be increased. In the case of the horizontal axis wind turbine, increasing the cross-sectional area of the wing increases the resistance of the front of the wing as well as the resistance of the back of the wing. . Efforts have been made to reduce the resistance of the back of the wing, but there is a limit to reducing the resistance of the back of the wing itself. Therefore, when the front of the wing faces the direction of wind blowing, it is attempted to increase the swim area and to reduce the swim area when the back side of the wing faces the wind blowing direction.

For example, Korean Patent Laid-Open Publication No. 1999-0068708 discloses a wing structure in which a door is attached to a wing fixed to a rotary shaft, and the door is closed when the wind direction and the rotation direction are the same. Korean Patent No. 0426609 proposes to design the wings with scalloped wings having a structure in which when the wind is in the forward direction, it stands upright to the maximum wind, and in the reverse direction rotates in that direction to minimize wind resistance. Korean Patent No. 0954760 discloses a wind power generator including a fixed blade having wind holes formed therein for allowing wind to pass therethrough and an auxiliary blade rotatably installed on the fixed blade for opening and closing the wind hole only in one direction according to the wind direction The windmill is started. Similarly, in Korean Patent No. 1083916, when the rotating direction and the wind direction are the same, when the rotating direction and the wind direction are the same, the rotating force is increased by receiving the wind force, and when the rotating direction and the wind direction are opposite to each other, Discloses constructing a wing with a dual structure of a second rotary wing.

These prior arts provide a way to reduce the cross-sectional area of the wing, that is, the swirling area, by automatically opening a part of the wing like a door when the back side of the wing is directed to the wind direction without using auxiliary power. However, since they have to be made of a double structure, that is, a main wing and a secondary wing, the structure is complicated and not only the cost is increased, but also the secondary wing is kept closed and thus the noise is increased and the main wing and the secondary wing collide with each other, .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vertical axis wind power generator capable of automatically adjusting the cross-sectional area of a blade with a relatively simple structure without using auxiliary or auxiliary power.

It is another object of the present invention to provide a blade angle varying mechanism with less noise generation and excellent durability in a vertical axis wind power generator.

The present invention provides a vertical axis wind power generator in which the angle of the wing with respect to the ground is automatically adjusted between vertical and horizontal as the wing rotates.

The wind turbine includes a tower fixed to the ground, a vertical rotation shaft supported by the tower and connected to transmit rotational force to the generator, a hub coupled to the vertical rotation shaft and having a plurality of connection ports, And a plurality of blades respectively coupled to the plurality of connecting rods such that a center of gravity thereof is located below the connecting rods in a vertical state, And the upper portion of the tower may be provided with an up-down weight, and the upper portion of the tower may be provided with an up-down weight as the wing rotates about the vertical rotation axis, A weight-bearing rail is provided, and the up-down weight- It has a constant radius and a section with a constant height from the ground and a section where the height from the ground is displaced. Thus, when the wing rotates around the vertical rotation axis, the up-down weight adjusting rail is horizontal in a section having a constant height from the ground, and when the height of the up-down weight is displaced from the ground, .

In the present invention, it is preferable that the up-down weight is composed of a leg portion protruding from a joint portion with the connecting rod and a roller portion such as a wheel or a bearing provided at an end of the leg portion. The roller portion is a portion contacting the up-down weight applying rail so as to be able to draw on the up-down weight adding rail for adding the up-down weight. The legs are formed in a cantilevered shape and one end thereof is coupled to the connecting rod and the other end is connected to the roller unit is advantageously displaced while traveling on the up-down weight adding rail for adding the up-down weight.

The up-down weighting rail preferably has a height from the ground in a circular arc section of 120-180 °, more preferably about 150 °, and the height from the ground in the remaining section can be designed to be the same. Accordingly, when the wing rotates around the vertical rotation axis, the height of the up-down weight from the ground surface of the up-down weight is lowered so that the wing is vertically rotated by the rotation of the connecting rod, The height of the up-down weight is increased from the ground, and the connecting rod is rotated in a direction opposite to that at the time of lowering the height of the up-down weight to bring the wing into a horizontal state.

In one aspect of the present invention, in order to support the weight of a large wing that can be applied for a large vertical wind wind power generator, a support bearing is provided in the connecting rod near the up-down weight, A rail for the support bearing which is able to ride and has a constant height from the ground is installed. The weight of the wing is supported by the tower through the support bearing and the support bearing rail.

In the practice of the present invention, the height from the ground of the up-down weight rail and the support bearing rail is designed to be substantially the same in a section in which the wing is horizontal.

In one aspect of the present invention, the vertical axis wind power generator may further include an overall hemispherical lid positioned above the tower and coupled to the rotation axis, and the hemispherical lid may have a plurality of blades.

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The vertical axis wind turbine blade of the present invention can automatically adjust its own angle so that the swim area can be changed between the maximum and minimum without using the auxiliary blades. Therefore, compared with the conventional technology, the structure is simple, As well as being operated, the noise generation is very small.

In addition, since the swing area of the wing can be reduced by the horizontal cross-sectional area of the wing when the wind is in the reverse direction, the size of the wing can be increased while minimizing the resistance against the reverse wind.

FIG. 1 is a schematic view of an overall appearance of a vertical axis wind turbine according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a schematic view of a portion related to connection and rotation of a wing in a vertical axis wind turbine according to an embodiment of the present invention. FIG. 2a is a front view and FIG. 2b is a perspective view.
FIG. 3 is a view showing a part related to a rail for a support roller and an up-down weight rail in a vertical axis wind power generator according to an embodiment of the present invention.
4 is a view showing an example of an up-down weight according to the present invention.

Additional aspects, features and advantages of the present invention will become apparent from the following description of exemplary embodiments, which should be understood in conjunction with the accompanying drawings. To facilitate a clear understanding of the present invention, some of the elements in the figures may be exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. The following examples are intended to illustrate the preferred embodiments of the present invention in order that those skilled in the art will understand and readily practice the present invention, and should not be construed as limiting the present invention. Those skilled in the art will recognize that various changes and modifications can be made within the spirit and scope of the invention.

Referring first to Figure 1, the overall appearance of a vertical axis wind power generator in accordance with one embodiment of the present invention is schematically illustrated. The wind turbine generator includes a tower 10 as a body for supporting a vertical rotary shaft and a blade, a blade 20 connected to the vertical rotary shaft through connecting members and exposed to the outside of the tower 10 and rotated around a vertical rotary shaft by wind power, 20 ').

Although the wind power generator is illustrated as including two wings 20, 20 'for clarity and simplicity of explanation, it is preferable to include three or more wings. More preferably three to six wings are installed at equal intervals around the vertical axis of rotation. The wings 20 and 20 'are preferably rectangular in shape when viewed from the front, but are not limited thereto. The wings 20 and 20 'may have various shapes such as a horizontal cross section of a streamlined shape, an elliptical shape, a hemispherical shape, a rectangular shape, and the resistance coefficient of the back side of the wing is preferably designed smaller than the front side.

Alternatively, the wings may be in the form of a curved surface whose front surface is convex and whose horizontal cross section is a crescent shape, and which is provided with a streamlined or semi-mound horizontal plate at the top (not shown) when viewed from a vertical position. At this time, the central vertical section of the wing will look like a hoe. In the case of such a wing shape, the streamlined / semicircular horizontal plate facilitates the horizontal movement of the wing due to the wind when the wing is changed to a horizontal state, and in order to prevent the wing from being damaged or overloaded during a strong wind such as a typhoon, When it is required to set the horizontal state, the streamline / semicircular horizontal plate receives the wind pressure and the wing rotates about the vertical rotation axis, so that the generator can be operated.

In FIG. 1, the right wing 20 is a vertical state having the maximum water flow area and the left wing 20 'is a horizontal state having the minimum water flow area. For example, when the wind is blown from the front as in the block arrow, the right blade 20 suffers wind pressure and the left blade 20 'receives little wind pressure. Accordingly, the vanes 20 and 20 'rotate in the clockwise direction about the vertical rotation axis, thereby maximizing the utilization of wind and increasing the efficiency of the generator. The same vane automatically changes between the vertical and horizontal states as it rotates about the vertical axis of rotation, the mechanism for this change will be described later.

A lid 30 is provided at the top of the tower 10 to prevent rainwater or the like from entering the tower 10. The lid 30 is coupled to a vertical axis of rotation inside thereof and a plurality of blades 31 may be formed on the surface thereof. In this case, the wing 31 of the lid guides the wind blowing to the wings 20 and 20 'toward the wings 20 and 20' in order to assist the rotation of the wings 20 and 20 ' The windshield wing 31 of the lid may be rotated so as to rotate with a strong wind to operate the generator.

Referring now to FIG. 2, there is shown a portion associated with connecting and rotating a wing in a vertical axis wind turbine in accordance with an embodiment of the present invention. And the parts not directly related to the present invention in the internal configuration of the vertical axis wind power generator are not shown. The vertical rotation axis 40, which is connected to the generator via the power transmission means, is generally located in the central axis X of the tower 10. [

A hub 50 for connection between the wings 20 and 20 'and the vertical rotation shaft 40 is connected to the vertical rotation shaft 40 and connected to the connection ports 51 and 52 of the hubs arranged at the same interval, 60 'and 60', respectively, and the wings 20 and 20 'are firmly coupled to the other ends of the connecting rods 60 and 60', respectively. In order for the angle of the wings 20 and 20 'with respect to the ground to vary, that is, the wings 20 and 20' rotate about the horizontal axis Y, the connecting rods 60 and 60 ' , 52, respectively. To this end, it is preferable that the connection ports 51 and 52 of the hub are formed in a cylindrical shape and one ends of the connection rods 60 and 60 'are inserted into the connection ports 51 and 52, respectively. In order to smoothly rotate the connecting rods 60 and 60 ', one or a plurality of bearings are preferably provided around the connecting rods 60 and 60' within the connecting rods 51 and 52. In order to prevent the connecting rods 60 and 60 'from escaping from the connecting ports 51 and 52 due to the centrifugal force when the wings 20 and 20' are rotated, the radiuses of the connecting ports 51 and 52 gradually decrease toward the distal end , It is preferable that the connecting rods 60 and 60 'are formed such that the radius gradually increases toward the distal end.

The wings 20 and 20 'are coupled to the connecting rods 60 and 60' such that their center of gravity is positioned lower than the connecting rods 60 and 60 '. Preferably, the vicinity of the 1/3 point from the top of the total longitudinal length is engaged with the connecting rods 60, 60 '. Therefore, when the wings 20 and 20 'are in the state where the external force is not present, the center of gravity is sufficiently below the joining position with the connecting rods 60 and 60', so that the wings 20 and 20 ' When the wings 20 and 20 'are not forcibly lifted by the up-down weight raising rails, the wings 20 and 20' are kept in a vertical state.

Supporting bearings 70 and 70 'and up-down weight weights 80 and 80' are provided between the connection ports 51 and 52 of the hub and the vanes 20 and 20 ', respectively. The up-down weights 80 and 80 'and the support bearings 70 and 70' are advantageously provided adjacent to each other in designing the rails provided on top of the towers described later.

With respect to the use of the support bearings 70, 70 ', the connecting rod 60, 60' can be deformed due to the weight of the wings 20, 20 ', and also the fluctuation due to the change in angle of the wing . The support bearings 70 and 70 'can support the weight of the wing while rolling over the rails for supporting bearings having a constant height from the ground, thereby minimizing the vibration of the rotor. The peripheral surfaces of the support bearings 70 and 70 'are surrounded by rubber-like elastic materials, which is advantageous in suppressing noise and the like.

The up-down weight weights 80, 80 ', which are preferably located adjacent to the support bearings 70, 70', are designed to protrude in the longitudinal direction of the wing, 60, 60 '. Therefore, when the ends of the up-down weights 80 and 80 'move like a watch, the connecting rods 60 and 60' rotate about the horizontal axis Y and the wings 20 and 20 ' do.

Since the center of gravity of the up-down weight 80 and 80 'is located on the same side as the center of gravity of the vanes 20 and 20', the weight of the up-down weight contributes to the vertical state of the vane. 2, the left up-down weight 80 is in a state where the height from the ground is the lowest, so that the wing 20 is in a vertical state, and the right up-down weight 80 'is in a state where the height from the ground is the highest The wings 20 'are therefore horizontal. In order for the wings 20 and 20 'to vary between the vertical and horizontal states, the angle between the highest and lowest states at the height from the ground of the up-down weight weights 80 and 80' 90 °.

4 is a side cross-sectional view in a state in which the up-down weight 80 is coupled to the connecting rod 60 as a preferable structure of the up-down weight. The up-down weight 80 includes an engaging portion 81 engaged with the connecting rod 60, a leg portion 82 projecting from the engaging portion 81, and a roller portion 83 located at the end of the leg portion 82 Lt; / RTI >

The imaginary straight line L connecting the center of the engaging portion 81 and the center of the roller portion 83 is parallel or substantially parallel to the longitudinal direction of the blade. That is, when the up-down weight 80 is positioned so that the straight line L is perpendicular to the ground, the up-down weight 80 and the wing 20 are connected to the connecting rod 60 ). The leg portion 82 connecting the engaging portion 81 and the roller portion 83 is formed to be deviated from the straight line L as shown in the figure. When the up-down weight 80 passes over the up- Thereby facilitating displacement as indicated by the arrow A direction. The angle ? Formed by the center of the leg portion 82 and the center of the engaging portion 81 and the roller portion 83 is preferably about 100 degrees.

The roller portion 83 of the up-down weight is preferably made of, for example, a wheel or a bearing, and is preferably provided with a rubber-like elastic material on the rim in order to reduce noise and vibration generated when traveling on the up-down weight rail. It is preferable that the roller portion 83 is particularly heavy in the up-down weight 80 in order to help the wing to be in a vertical state.

Referring now to FIG. 3, two rails adjacent to each other on the top of the tower 10, namely, rails 100 for supporting bearings and rails for up-down weights 200 are mounted on blades 20, 20 ' 70, 70 ', up-down weight 80, 80', and the like. Each rail is provided at a position where the support bearings 70, 70 'and the up-down weight 80, 80' can pass by as the wings 20, 20 'rotate about the vertical axis of rotation 40.

The rail 100 for the support bearing, which is preferably located on the upper periphery of the tower 10, is substantially the same as the lower surface of the support bearings 70, 70 'from the ground and is generally uniform. Thus, as the support bearings 70, 70 'are able to roll over the rail 100 for the support bearing while maintaining the horizontal position, thereby causing the blades 20, 20' to rotate about the vertical axis of rotation 40 It is possible to minimize the fluctuation that may occur.

On the side of the support bearing rail 100, an up-down weight applying rail 200 is located. Like the support bearing rail 100, the up-down weight support rail 200 has a constant radius, but unlike the support bearing rail 100, the height of the up-down weight support rail 200 varies from the ground in a certain section, It is installed so as to rise gradually.

For example, in the up-down weight rail 200, the remaining section (second section) excluding the first section (the section through which the blade 20 passes in the section divided into two sections by A-A 'in FIG. 3) And the height from the ground in the first section is lower than the height from the ground in the second section. Preferably, the height of the second section from the ground is substantially the same as the width of the up-down weight 80 when the up-down weight 80 is at its highest height, and the minimum height of the first section is the height of the up- And is substantially the same as the lower surface of the up-down weight 80 when it is at the lowest level. Accordingly, when the up-down weight 80 passes the second section, the vane 20 is substantially horizontal, and when passing the first section, the vane 20 is not horizontal.

The first section may be divided into three sections, that is, S1, S2, and S3, depending on the state of the up-down weight 80 and the wing 20. When the wing 20 rotates counterclockwise, the up-down weight 80 moves from the second section to the S1 section of the first section, so that the center of gravity of the wing 20 and the weight of the up- Due to the center of gravity, the up-down weight 80 is automatically displaced to a lower height from the ground, and accordingly, the connecting rod 60 is rotated so that the angle of the wing 20 coupled thereto is gradually changed do. 3, the wing 20 passing through the S1 section of the up-down weighting rail 200 is shown with a dotted line to the right of the wing indicated by the solid line.

In the S2 section, the angle of the blade 20 is completely vertical as shown by the solid line, and the swirling area of the blade is the maximum. The blade 20 receiving the wind force in the first section rotates counterclockwise about the vertical axis of rotation. When the up-down weight 80 passes the up-down weighting rail 200 and the connecting rod 60, The up-down weight 80 is displaced toward a higher height from the ground. Therefore, the angle of the blade 20 gradually changes to a horizontal state again like a wing shown by a dotted line to the left of a wing indicated by a solid line, and becomes completely horizontal when it reaches the second section after the S3 section.

In order to minimize the impact generated when the up-down weight 80 is displaced, it is preferable that the introduction portion and the end portion of the sections S1 and S3 are formed so as to form a gentle slope. In terms of maximizing the use of wind power, the arc angle of the first section is preferably 120-180 °, more preferably about 150 °. At this time, it is preferable that the arc angle of the section S2 is about 40-60 degrees which is about 1/3 of the arc angle of the first section.

In the present invention, it is to be understood that when the vane 20 is in the first section, the other vane 20 'of the wind turbine is in the second section so that the vane 20' is horizontal. As the wing 20 rotates about the vertical axis of rotation 40 and the wing 20 'enters the first section, the wing 20' is similar to the wing 20 acting in the first section as described above .

Although the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is entitled to the full scope of the appended claims.

The present invention relates to a hub and a hub which are connected to each other by means of a connecting rod and a connecting shaft connected to the connecting shaft. Bearing rail 200: Up-down weight rail

Claims (8)

A vertical axis wind turbine in which the angle of the wing with respect to the ground is automatically adjusted between vertical and horizontal as the wing rotates,
A tower 10 fixed to the ground;
A vertical rotating shaft (40) located on the center axis of the tower and connected to transmit rotational force to the generator;
A hub (50) coupled to the vertical rotation shaft and having a plurality of connectors (51, 52);
A plurality of connecting rods (60, 60 ') rotatably connected to the plurality of connecting ports of the hub; And
A plurality of blades (20, 20 ') respectively coupled to the plurality of connecting rods such that the center of gravity is positioned below the connecting rods in a vertical state;
, And the connecting rod is provided with fixed up-down weights (80, 80 ') projecting in the longitudinal direction of the wing,
Up-down weight rails (200) for raising the height of the up-down weight from a ground level can be installed at the top of the tower, as the wing rotates about the vertical rotation axis And,
Here, the up-down weight applying rail 200 has a constant radius, a section having a constant height from the ground, and a section having a height displaced from the ground,
When the wing rotates about the vertical rotation axis, the up-down weight applying rail 200 is horizontal in a section having a constant height from the ground, and the up-down weight applying rail 200 is moved in a section where the height from the ground is displaced Wherein the angle of the wing is variable in the vertical axis wind turbine. 2. The apparatus of claim 1, wherein the connecting rod is provided with a support bearing (70, 70 ') near the up-down weight, and a height from the ground is formed on the support bearing (70, Wherein the weight of the wing is supported by the tower through the support bearing and the support bearing rail. ≪ RTI ID = 0.0 > [0002] < / RTI > delete 3. The up-down weighting rail according to claim 1 or 2, wherein the up-down weighting rail has a height from a ground level in a circular arc section of 120 to 180 ° and a height from a ground surface in the remaining section is the same, And the height of the up-down weight from the ground is lowered in the arc-shaped angle section of 120-180 DEG when rotated about the center, so that the blade becomes a vertical state. The wind turbine of claim 1 or 2, wherein the vertical axis wind power generator further comprises a hemispherical lid (30) located above the tower and coupled to the vertical rotation axis, wherein the hemispherical lid has a plurality of blades Features a vertical axis wind power generator. The vertical axis wind turbine generator according to claim 1 or 2, wherein the up-down weight includes a leg portion (82) projecting from a joint portion with the connecting rod and a roller portion (83) provided at an end of the leg portion . The vertical axis wind power generator according to claim 6, wherein the legs are formed in a cantilever shape. delete

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