Wind driven generator

Abstract

The present invention relates to a wind power generator, and more particularly, to a wind power generator comprising: a main body part; a wind shield part which is provided at a distance from the main body part and is formed so as to have a flat surface wider than the main body part; a gear box which is provided at the lower part of the main body part, supports the main body part so that the main body part can rotate, and transmits the rotation of the main body part; and a generator connected to the gearbox via a shaft, the main body portion and the wind shield portion being provided parallel to each other, and the main body portion being rotated by a vortex generated by a collision between wind and the wind shield portion, thereby causing the generator to generate electric energy.

Description

Technical Field

[0001] The present invention relates to a wind turbine, and more particularly to a bladeless wind turbine that converts wind energy into electrical energy based on the force of a main body (bluff body) rotating (oscillator motion) due to vibration generated by eddy currents generated when wind collides with a windshield (obstacle). Background Art

[0002] Generally, a wind turbine is a device that converts wind energy into electrical energy, and generates electricity from the rotational force of the blades generated by rotating the blades of the wind turbine. As an example, Korean Patent Gazette No. 10-0960042 (May 31, 2010) discloses a wind turbine having a blade direction angle adjustment unit.

[0003] However, under the existing situation as described above, the efficiency is as low as about 40% to 45%, and there is a disadvantage that the time and cost required for manufacturing, transportation, installation and maintenance are very large.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Korean Patent Publication No. 10-0960042 (2010.05.31) Summary of the invention

[0007] The present invention is used to solve the problems in the prior art as described above. The purpose of the present invention is to provide a bladeless wind turbine that converts wind energy into electrical energy based on the force of rotating the main body (oscillator movement) caused by the vibration generated by the vortex generated when the wind collides with the windshield.

[0008] The purpose of the present invention is not limited to the above-mentioned purpose. Other purposes of the present invention not mentioned here can be clearly understood by ordinary technicians in the technical field to which the present invention belongs through the following description.

[0009] A preferred embodiment of a wind turbine generator of the present invention is characterized in that it includes: a main body; a windshield portion, which is separated from the main body and formed in a manner of having a flat surface wider than the main body; a gear box, which is arranged at the lower part of the main body and supports the main body in a manner that enables the main body to rotate, and is used to transmit the rotation of the main body; and a generator, which is connected to the gear box through an axis, the main body and the windshield portion are arranged parallel to each other, and the main body is rotated by the vortex generated by the collision between the wind and the windshield portion, so that the generator generates electrical energy.

[0010] Furthermore, a preferred embodiment of the present invention is characterized in that the gear box includes a mechanical rectifier that converts the rotation of the shaft into a unidirectional rotation.

[0011] Furthermore, a preferred embodiment of the present invention is characterized in that it further comprises a spacing adjustment portion, which is combined with the wind shield portion and can adjust the spacing between the main body portion and the wind shield portion by moving the wind shield portion.

[0012] Furthermore, a preferred embodiment of the present invention is characterized in that it further includes a plate, which supports the gear box and the wind shield, respectively, and is arranged in a manner that the plates can rotate around an axis perpendicular to the ground.

[0013] Furthermore, a preferred embodiment of the present invention is characterized in that it also includes a guide member, which is arranged in a row with the main body and the wind shield portion on the upper part of the above-mentioned plate, and forms a flat surface along a direction perpendicular to the above-mentioned wind shield portion. When the above-mentioned wind collides with the above-mentioned guide member, the above-mentioned wind shield portion is located in the direction of the above-mentioned wind as the above-mentioned plate rotates.

[0014] According to the above technical scheme, the wind turbine of the present invention has the following effect: it provides a bladeless wind turbine that converts wind energy into electrical energy based on the force of rotating the main body (oscillator movement) generated by the vibration generated by the eddy current produced when the wind collides with the wind shield, thereby improving energy efficiency.

[0015] More specifically, the main principle of bladeless wind turbines (impellers) is to use the vibrations generated by the vortexes generated when wind passes through a structure to convert the movement into electrical energy. Existing conventional wind turbines with blades show an efficiency of 40% to 45%, while for the wind turbine of the present invention, the bladeless wind turbine of the present invention shows an efficiency of about 60% or more. In addition, the costs including manufacturing, transportation, installation and maintenance will be reduced. With the absence of blade rotation, less moving parts will be used, and the time and cost for maintenance and repair will be reduced in terms of time and economy. Moreover, since there is no movement of blades in bladeless turbines, it will be easier for people and animals to avoid the blades, and noise pollution can be reduced by significantly reducing the noise level, which can bring wind turbines closer to urban environments and energy consumption areas.

[0016] The effects of the present invention are not limited to the effects mentioned above, and other effects of the present invention not mentioned here can be clearly understood by a person skilled in the art in the technical field to which the present invention belongs through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a perspective view showing the structure of a wind turbine according to an embodiment of the present invention.

[0018] Figure 2It is a diagram showing the structure of a main body of a wind turbine generator according to an embodiment of the present invention.

[0019] Figure 3 The figure shows the structure of a gear box of a wind turbine according to an embodiment of the present invention.

[0020] Figure 4 It is a diagram showing the structure of a mechanical rectifier of a wind turbine generator according to an embodiment of the present invention.

[0021] Figure 5 This is a diagram showing an enlarged structure of a spacing adjustment portion and a plate of a wind turbine generator according to an embodiment of the present invention.

[0022] Figure 6 The figure shows the operation state of the wind turbine according to one embodiment of the present invention in which the main body performs the oscillator motion by the wind.

[0023] Figure 7 and Figure 8 The figure is a diagram showing the Reynolds number voltage based on the diameter of the main body and the distance between the main body and the wind shielding part of the wind turbine generator according to an embodiment of the present invention.

[0024] Fig. 9 and Fig.10 It is a diagram showing the cross-sectional shape of a main body of a wind turbine generator according to still another embodiment of the present invention.

[0025] Fig.11 The figure shows the cross-sectional shape of the wind shielding portion of a wind turbine generator according to another embodiment of the present invention. DETAILED DESCRIPTION

[0026] The terms used in this specification are briefly explained, and the present invention is specifically explained.

[0027] In terms of the terms used in the present invention, common terms that are currently widely used are selected as much as possible in consideration of the functions in the present invention, but they may be different according to the intentions of technicians in this technical field or precedents, the emergence of new technologies, etc. Therefore, the terms used in the present invention should be defined based on the meanings of the terms and the full content of the present invention, and are not limited to simple term names.

[0028] Throughout the specification, when a part is expressed to “comprise” a certain structural element, unless there is no particular description to the contrary, other structural elements may also be included, rather than being excluded.

[0029] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. However, the present invention can be implemented in a variety of different implementations, and the present invention is not limited to the embodiments described herein.

[0030] Specific matters including the technical problems, technical solutions and effects of the present invention will be included in the embodiments and drawings to be described below. Figure 1 With the detailed description of the various embodiments, the advantages, features and methods for achieving the same will be apparent from the present invention.

[0031] Flow-Induced Vibration (FIV) is a widely observed physical phenomenon in the field of engineering, which is caused by aerodynamic instability or vortex shadowing when a fluid flows through a thin structure. That is, the wind turbine of the present invention is a flow-induced vibration energy harvester, which has the ability to extract energy (harvest energy) from the surrounding flow field to provide power. It refers to the time when vortex distances or Kalman vortex distances are generated in the vortex area during the flow of fluid through the main body (bluff body). Starting from the surface of the main body, the periodic shadowing (shedding) of the vortex causes asymmetric pressure on the structure, thereby generating alternating aerodynamic forces. This alternating aerodynamic force will develop into vibrations of the main body that can be used for power generation.

[0032] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

[0033] Reference Figure 1 A wind turbine generator in a preferred embodiment of the present invention includes: a main body 100; a windshield 300, which is separated from the main body 100 and formed in a manner of having a flat surface wider than the main body 100; a gear box 200, which is arranged at the lower part of the main body 100, supports the main body 100 in a manner that enables the main body 100 to rotate, and is used to transmit the rotation of the main body 100; and a generator 400, which is connected to the gear box 200 through a shaft, the main body 100 and the windshield 300 are arranged parallel to each other, and the main body 100 is rotated by the vortex generated by the collision between the wind and the windshield 300, so that the generator 400 generates electrical energy.

[0034] First, the main body 100 is provided. The main body 100 is a mass body that rotates due to the vortex generated by the collision between the wind and the wind shield 300, and plays a role in transmitting wind energy in the form of oscillator motion. Figure 2The main body 100 includes: a main body 110, which is formed in a cylindrical shape; a connecting rod 120, which is extended from the lower part of the main body 110; a partial gear 130, which is arranged at the lower part of the connecting rod 120, and at least a part of which is formed in a sawtooth gear shape; and a rotating shaft 140, which is arranged at the center of the partial gear 130, and is used to enable the main body 100 to rotate. The rotating shaft 140 is inserted into and supported in a rotating shaft hole 211 to be described later, and the main body 100 is arranged in a manner that it can perform a vibrator motion around the rotating shaft 140. Moreover, by rotating the main body 100, the partial gear 130 rotates, thereby rotating the first transmission gear 220 or the second transmission gear 230, and the rotation of the main body 100 is transmitted to the generator 400 to generate electric energy by converting it into a unidirectional rotation through the mechanical rectifier 250 to be described later.

[0035] Next, the gear box 200 is provided. The gear box 200 transmits the rotation of the main body 100 generated by the vortex of the wind to the generator 400 in the form of a rotational motion. Figure 3 The gear box 200 includes: a rotating frame 210 having a space formed therein; and a first transmission gear 220 and a second transmission gear 230 which are rotatably disposed inside the rotating frame 210 and arranged side by side. The rotating frame 210 includes a rotating shaft hole 211 and a bearing, so that the rotating shaft 140 is inserted into the upper portion of the rotating frame 210 and rotatably supports the rotating shaft 140. In this case, the partial gear 130 is disposed in a meshing manner between the first transmission gear 220 and the second transmission gear 230, respectively, and the rotation of the partial gear 130 is transmitted to the first transmission gear 220 and the second transmission gear 230.

[0036] Furthermore, the gearbox 200 includes a mechanical rectifier 250 that converts the rotation of the shaft into a unidirectional rotation. More specifically, the mechanical rectifier 250 receives the oscillator motion of the main body 100, converts the rotation in one direction and the other direction into a unidirectional rotation, and transmits it to the generator 400. That is, the mechanical rectifier 250 converts the clockwise rotation and the counterclockwise rotation into a unidirectional rotation, thereby causing the shaft connecting the gearbox 200 and the generator 400 to rotate in a unidirectional manner.

[0037] More specifically, in the case where the mechanical rectifier 250 is not provided, the shaft will perform reciprocating rotational motion instead of unidirectional rotational motion as the partial gear 130 moves. That is, if the partial gear 130 rotates clockwise, the first transmission gear 220 and the second transmission gear 230 will rotate counterclockwise, and the shaft will rotate counterclockwise, so that the partial gear 130 returns to the original position or rotates counterclockwise to rotate the first transmission gear 220 and the second transmission gear 230 clockwise, thereby rotating the shaft clockwise. That is, the mechanical rectifier 250 plays a role in transmitting a rotational motion in a predetermined direction to the generator 400 by converting such a reciprocating rotational motion into a unidirectional rotational motion. In this case, the mechanical rectifier 250 may further include a planetary gear (not shown in the drawings) for increasing the rotational speed.

[0038] As an example, refer to Figure 4 The mechanical rectifier 250 includes: a first shaft 251, which receives the rotational motion of the partial gear 130 through the first transmission gear 220 to rotate; a first gear 252, which rotates along the first shaft 251; a second gear 253, which rotates along the first shaft 251 and is separated from the first gear 252; a third gear 255, which is adjacent to the first gear 252 and rotates in a direction opposite to the rotation direction of the first gear 252 as the first gear 252 rotates; a second shaft 256, which rotates or receives the rotation of the third gear 255. The fourth gear 257 rotates along the second shaft 256 and is arranged on the same straight line as the second gear 253; the output gear 258 is arranged between the second gear 253 and the fourth gear 257; the output shaft 259 rotates with the output gear 258 and is used to transmit the rotational motion to the generator 400; and the one-way clutch 254 is respectively arranged on the second gear 253 and the fourth gear 257, and is used to make the second gear 253 and the fourth gear 257 rotate in one direction respectively.

[0039] Therefore, the rotational movement of the partial gear 130 will be transmitted to the first transmission gear 220, and will be transmitted to the first gear 252 through the first shaft 251. The clockwise rotational movement of the first shaft 251 can make the first gear 252 rotate clockwise, and the one-way clutch 254 provided on the second gear 253 will also rotate clockwise. The second gear 253 is combined with a one-way clutch 254 that closes the clockwise direction, and the clockwise rotational movement of the first shaft 251 will be transmitted to the second gear 253. On the contrary, the counterclockwise rotational movement of the third gear 255 activated by the clockwise rotation of the first gear 252 will be transmitted to the one-way clutch 254 provided on the fourth gear 257 through the second shaft 256. In this case, since the one-way clutch 254 provided in the fourth gear 257 is also closed in the clockwise direction and opened in the counterclockwise direction, the counterclockwise rotational movement of the second shaft 256 will not be transmitted to the fourth gear 257. Therefore, the output gear 258 will rotate counterclockwise, and the output shaft 259 will also rotate counterclockwise.

[0040] On the contrary, the counterclockwise rotation of the first shaft 251 will cause the first gear 252 to rotate counterclockwise, and since the one-way clutch 254 provided on the second gear 252 is opened counterclockwise, the rotation of the first shaft 251 will not be transmitted to the second gear 253. On the contrary, due to the counterclockwise rotation of the first gear 252, the third gear 255 will rotate clockwise, which will be transmitted to the one-way clutch 254 provided on the fourth gear 257 through the second shaft 256. Since the one-way clutch 254 provided on the fourth gear 257 is also closed clockwise, the fourth gear 257 will rotate clockwise with the clockwise rotation of the second shaft 256. Therefore, due to the clockwise rotation of the fourth gear 257, the output gear 258 will rotate counterclockwise, and the output shaft 259 will also rotate counterclockwise. Finally, the output shaft 259 will only rotate in one direction, that is, only in the counterclockwise direction, regardless of the rotation direction of the shaft 202. In other words, the reciprocating rotational force of the partial gear 130 based on the oscillator motion of the main body 100 will be transmitted to the output shaft 259, and as the output shaft 259 only rotates in the counterclockwise direction, the generator 400 can continue to produce electricity.

[0041] Next, the wind shield 300 is provided. The wind shield 300 serves to guide the wind to generate vortices by colliding with the wind. As an example, the wind shield 300 may be formed in a plate shape having a lateral length greater than the diameter of the main body 110. In other words, the wind shield 300 includes: a wind shield flat surface 310 formed in a rectangular plate shape; and a coupling rod 320 coupled to a slider 510 to be described later at the lower portion of the wind shield flat surface 310. Furthermore, the wind shield 300 is linearly transferred by the interval adjustment portion 500 to be described later, thereby adjusting the interval between the wind shield 300 and the main body 100. Furthermore, the wind shield 300 is arranged in parallel with the main body 100 and the guide member 700 to be described later on a straight line.

[0042] Next, refer to Figure 5 The wind turbine of the present invention further includes a spacing adjustment unit 500, which is combined with the wind shield 300 and adjusts the spacing between the main body 100 and the wind shield 300 by linearly moving the wind shield 300. In other words, the spacing adjustment unit 500 can linearly reciprocate the wind shield 300 in the direction toward the main body 100, thereby adjusting the spacing between the wind shield 300 and the main body 100. As an example, the spacing adjustment unit 500 includes: a slider 510, which is combined with the coupling rod 320; a screw 520, which is inserted into the slider 510 to rotate; a linear bearing 521; a stepping motor 530, which is connected to the screw 520 and provides a driving force for rotating the screw 520; and a rigid frame 540, which is combined with a plate 600 to be described later and is used to support the stepping motor 530. Therefore, if the stepper motor 530 rotates in one direction, the screw 520 will rotate in one direction, thereby linearly moving the slider 510 in the direction toward the main body 100. If the stepper motor 530 rotates in the other direction, the screw 520 will rotate in the other direction, thereby linearly moving the slider 510 in the opposite direction to the direction toward the main body 100. The interval between the wind shield 300 and the main body 100 can be adjusted accordingly.

[0043] Next, the wind turbine of the present invention further includes a plate 600, which supports the gear box 200 and the wind shield 300, respectively, and is arranged in a manner that can rotate around an axis perpendicular to the ground. As an example, the plate 600 is formed in a disc shape, supported by a thrust bearing 620, and rotates along the direction of the wind through a guide member 700 to be described later. That is, the plate 600 includes: a plate body 610 formed in a disc shape; a support body 620, which is arranged at the lower part of the plate body 610 and is used to support the plate body 610; and a thrust bearing 630, which is arranged between the plate body 610 and the support body 620 and can rotate the plate body 610. In this case, the vertical rotation axis is arranged in a manner that allows the plate body 610 to rotate perpendicular to the ground.

[0044] Next, the wind turbine of the present invention further includes a guide member 700, which is arranged side by side with the main body 100 and the wind shield 300 on the upper part of the plate 600, and forms a flat surface along a direction perpendicular to the wind shield 300. When the wind collides with the guide member 700, the wind shield 300 is located in the direction of the wind as the plate 600 rotates. That is, the wind shield 300 and the guide member 700 are arranged in directions perpendicular to each other. In other words, the flat surface 310 of the wind shield and the flat surface 710 of the guide member are arranged perpendicular to each other so that the wind shield 300 is located in the direction from which the wind blows. As an example, refer to Figure 5 In the case where the wind blows from the lower left end to the upper right end, that is, in the case where the wind blows in a direction perpendicular to the direction toward the flat surface 310 of the wind shield, that is, in the case where the wind blows in a direction perpendicular to the direction toward the thin side surface of the wind shield 300, the amount of vortex generated will be reduced. In this case, the wind blowing in a direction perpendicular to the direction toward the flat surface 310 of the wind shield will collide with the flat surface 710 of the guide member, and then the plate body 610 will rotate counterclockwise to make the flat surface 310 of the wind shield be located in the direction facing the wind. Therefore, the plate body 610 rotates in real time with the flow of wind, so that the flat surface 310 of the wind shield 300 is located in the direction facing the wind, thereby achieving continuous power generation.

[0045] Therefore, refer to Figure 6 The main body 100 is rotated by eddy currents generated by the collision between the wind and the wind shield 300, and the rotation of the main body 100 is transmitted to the generator 400 through the gear box 200 as a rotational motion, thereby improving power generation efficiency.

[0046] In this case, refer to Figure 7 and Figure 8, the ratio of the interval Z between the main body 100 and the windshield 300 to the diameter D of the main body 100 may be 0.3 to 0.4. More specifically, when the ratio of the interval Z between the main body 100 and the windshield 300 to the diameter D of the main body 100 is 0.36, the highest power generation efficiency is presented.

[0047] On the other hand, the wind turbine of the present invention will show high power generation efficiency when a vortex with a high Reynolds number is formed. Therefore, the cross-sectional shape of the main body 100 can also be made into a shape that can guide the turbulence of wind.

[0048] As an example, refer to Fig. 9 Part (c) and Fig.10 The main body 102 has a cross-section in a shape as shown in the figure, and the power generation efficiency can be improved by making the Reynolds number of the wind colliding with the main body 102 larger.

[0049] On the other hand, refer to Fig.11 The portion (a) can be guided toward the main body 100 by bending the middle portion of the wind shield 301 disposed downstream of the main body 100, thereby minimizing the wind flowing outward and colliding with the wind shield 301.

[0050] On the other hand, referring to Fig.11 Part (b) can be guided to flow toward the side of the main body 100 by making the wind shield 302 disposed downstream of the main body 100 form an arc shape as a whole with the center portion as a reference, thereby minimizing the wind flowing outward and colliding with the wind shield 301.

[0051] Finally, the wind turbine of the present invention, as a bladeless wind turbine, converts wind energy into electrical energy based on the force of the main body rotating the oscillator motion through the vibration generated by the eddy current produced when the wind collides with the windshield (Obstacle), thereby having the advantage of improving energy efficiency.

[0052] As described above, a person skilled in the art in the art to which the present invention belongs may understand that the technical structure of the present invention described above may be implemented in other specific embodiments without departing from the technical idea or essential features of the present invention.

[0053] Therefore, the multiple embodiments described above are illustrative in all aspects and should not be understood as limiting. The scope of the present invention should be represented by the scope of protection claimed in the invention rather than the above detailed description, and all changes or modified embodiments derived from the meaning, scope and equivalent concepts of the scope of protection claimed in the invention should be interpreted as being included in the scope of the present invention.

[0054] In the present invention, a new geometry of a bluff body (main body) is proposed, and an obstacle (wind shield) on the rear side is used to optimize the distance between the edges of the obstacle position, thereby planning to improve the efficiency of the energy harvester based on flow-induced vibration. In addition to optimizing the geometry, if a flat obstacle located on the rear side of the bluff body is used, the vibration amplitude can be increased, thereby increasing the energy harvested. That is, the power generation is increased by increasing the Reynolds number. The optimal distance is Z / D=0.36. By using the obstacle at the optimal distance, the maximum power generation of the proposed geometry under the condition of Re=16000 is 26% higher than that of a cylindrical bluff body with an obstacle. In the case of a cylindrical bluff body, it can be achieved by using an obstacle. Compared with the state without an obstacle, it is about 86% higher. In terms of the width of the obstacle, when the width is the same as the diameter of the obstacle, it will show better performance. From the results, the proposed geometry with obstacles has the highest vortex value. The protruding sample with obstacles has 41% more peak values ​​of turbulent motion energy than the smooth sample, which means that more unstable aerodynamic forces act on the sample. In terms of instantaneous flow patterns and velocity vector images, in the protruding sample with obstacles, the vortex shadow of the model will aggravate the vortex shadow of the obstacle on the rear side, generating a stronger vortex by adding up these two vortex shadows. Finally, in order to generate manual control of wake parameters and propose a new generation of bladeless wind turbines, a new structure with obstacles downstream of the bluff body that have a considerable impact on the induced voltage is proposed. Bluff body geometry inspired by nature The geometry inspired by nature, which uses obstacles at the optimal distance with the optimal width, can effectively increase the amount of energy obtained by about 86% compared to existing bladeless wind turbines.

Claims

1. A wind turbine, characterized in that: include: Main body; A windshield portion is disposed apart from the main body portion and is formed in a manner of having a flat surface wider than the main body portion; a gear box, disposed at a lower portion of the main body, supporting the main body in a manner that enables the main body to rotate, and used to transmit the rotation of the main body; and A generator is connected to the gearbox via a shaft. The main body and the wind shield are arranged parallel to each other. The main body is rotated by eddy currents generated by the collision between wind and the wind shield, so that the generator generates electric energy.

2. The wind turbine according to claim 1, characterized in that: The gearbox includes a mechanical rectifier that converts the rotation of the shaft into a unidirectional rotation.

3. The wind turbine according to claim 1, characterized in that: The invention further comprises a spacing adjustment part, which is combined with the wind shield part and can adjust the spacing between the main body part and the wind shield part by moving the wind shield part.

4. The wind turbine according to claim 1, characterized in that: It also includes a plate, which supports the gear box and the wind shielding part respectively and is arranged in a manner of being rotatable around an axis perpendicular to the ground.

5. The wind turbine generator according to claim 4, characterized in that: It also includes a flow guide, which is arranged in a row with the main body and the wind shield at the upper part of the plate and forms a flat surface along a direction perpendicular to the wind shield. When the wind collides with the air guide, the wind shielding portion is located in a direction facing the wind as the plate rotates.

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