KR102545249B1 - Stackable disk-shaped triboelectric nanogenerator to generate energy from omnidirectional wind and operation method thereof - Google Patents

Abstract

The present invention relates to a stacked disk-shaped triboelectric generator generating energy from wind in all directions and an operating method thereof, and more particularly, to a disk-shaped triboelectric device comprising: disks spaced apart from each other in a height direction; a plurality of guides disposed in the interspace to rotate the triboelectric device with respect to the central point of the disk by omnidirectional wind; electrodes connected to inner ends of each of the guides; and a sphere interposed in an inner space within the interspace formed by the plurality of guides.

Description

Stackable disk-shaped triboelectric nanogenerator to generate energy from omnidirectional wind and operation method thereof}

The present invention relates to a stacked disc-shaped triboelectric generator generating energy from omnidirectional wind and an operating method thereof.

As energy consumption rapidly increases worldwide, technologies for harvesting renewable energy such as thermal energy, solar energy, and wind energy are being researched. Many research institutes are dedicated to the development of various energy harvesting technologies, including new energy transformation and conversion technologies, and energy recharging and storage technologies.

Among them, wind energy is an abundant, ubiquitous, and sustainable energy resource, which is a highly effective renewable energy resource that can be used to alleviate environmental problems around the world.

That is, among renewable energies, wind energy is one of the most common, sustainable and reliable energy sources, and is widely used to convert mechanical energy into electrical energy. To take advantage of this, research on energy utilization through wind turbines has been active.

Generally, wind turbines are used to convert wind energy into electrical energy. Wind power generators using wind turbines are mainly installed and operated in regions with high winds and low population density, such as deserts or grasslands.

Conventional wind power generators have high installation costs, are difficult to maintain, and have a limited machine life, so cost effectiveness is low. On the other hand, wind power generators cause environmental problems due to noise during operation and have difficulties in generating electrical energy with high efficiency.

In addition, wind variability according to speed and direction is a limitation of existing large-scale wind power generators.

In order to solve the limitations of these wind power plants, recently, small wind power generators that harvest various levels of wind energy using piezoelectric generators and triboelectric generators have been developed.

Nevertheless, chronic problems such as limited direction conditions, limitations on installation sites, occurrence of mechanical failures, and limited wind speed ranges could not be overcome. Overcoming these limitations requires innovative wind turbine designs with high availability and flexible constraints.

Therefore, unlike existing wind power generators, it is required to develop a wind power generator according to a new design that overcomes the limitations of existing wind power generators by utilizing a disk-shaped design so as not to entail any restrictions related to wind direction or installation.

Korean Registered Patent No. 10-2072921 Korean Registered Patent No. 10-1945259 Korean registered patent 10-1743240 Korean Registered Patent No. 10-1684845

Accordingly, the present invention has been made to solve the above conventional problems, and according to an embodiment of the present invention, an object of the present invention is to provide a triboelectric generator that generates energy from wind in all directions.

And according to an embodiment of the present invention, the disc-shaped design does not entail any restrictions related to wind direction or installation, and the lightweight charging spheres of the device can reduce the occurrence of mechanical failure and expand the wind speed range for generator operation. In particular, it is a stacked structure that can be easily stacked in several layers, thereby providing a stacked disk-shaped triboelectric generator that generates energy from omnidirectional wind and an operating method thereof that can show improved charging efficiency. there is

In addition, according to an embodiment of the present invention, it is possible to effectively harvest wind power in various directions and speeds through a disk-shaped triboelectric generator, and it is easy to install and easily increase output by stacking. Its purpose is to provide a stacked disc-shaped triboelectric generator that can generate energy from omnidirectional wind and its operation method, which can serve as a new paradigm by going beyond the limitations of generators.

On the other hand, the technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems that are not mentioned will become clear to those skilled in the art from the description below. You will be able to understand.

A first object of the present invention is to provide a disk-shaped triboelectric device comprising: disks spaced apart from each other in a height direction; a plurality of guides disposed in the interspace to rotate the triboelectric device with respect to the central point of the disk by omnidirectional wind; electrodes connected to inner ends of each of the guides; It can be achieved as a disc-shaped triboelectric device that generates energy from omnidirectional wind; and a sphere interposed in an inner space within the interspace formed by the plurality of guides.

Further, it may be characterized in that the spherical sphere rotates in a constant trajectory in the inner space by generating a turbulent flow of wind rotating from various directions to a constant direction through the guide in the inner space.

In addition, it may be characterized in that triboelectrification occurs between the surface of the sphere rotating in the constant orbit and the electrode to generate electric energy through an electrostatic induction phenomenon.

And the sphere may be characterized in that it is composed of a dielectric.

In addition, n guides may be arranged vertically in a planar direction, spaced apart from each other by a specific distance in the circumferential direction of the disk, and installed in the space between each other at a predetermined angle of 360/n.

And the electrode may be characterized in that it has a curvature portion having a specific curvature that is connected to the inner end of the guide and is curved inwardly.

In addition, the specific curvature may be characterized in that it corresponds to the predetermined trajectory.

In addition, a plurality of the disks may have a stack shape to have the space between them in a height direction.

In addition, the sphere may be characterized in that a plurality of interposed in the inner space.

A second object of the present invention is a stacked disk-shaped triboelectric generator comprising: a triboelectric device according to the first object; n/2 connecting lines connecting one electrode and another electrode in the n electrodes of the triboelectric device; and capacitors connected to each of the connection lines to accumulate electric charge due to a potential difference.

And the connection line may be characterized in that it connects between any one electrode and another electrode at a position opposite to the electrode.

In addition, it may be characterized in that it further comprises; a battery to which each of the capacitors are connected.

A third object of the present invention is a method of operating a disk-shaped triboelectric generator, comprising the steps of applying winds from various directions toward the disk-shaped triboelectric device; rotating the triboelectric device in a specific direction based on the central point of the disk; Rotating the sphere in a constant orbit within the inner space; and generating electric energy through electrostatic induction by generating triboelectrification between the surface of a sphere rotating in a certain orbit and the electrode. It can be achieved as an operating method.

And, in the n electrodes of the triboelectric device, a capacitor connected to each of the n/2 connection lines connecting one electrode and another electrode may accumulate charge due to a potential difference.

According to an embodiment of the present invention, there is an effect of providing a triboelectric generator that generates energy from wind in all directions.

And according to the stacked disk-shaped triboelectric generator generating energy from omnidirectional wind and its operating method according to an embodiment of the present invention, the disk-shaped design does not entail any restrictions related to wind direction or installation, and The device's lightweight charging spheres can reduce mechanical failures and expand the wind speed range for generator operation. In particular, they have a stacked structure that can be easily stacked in several layers, which has the effect of showing improved charging efficiency.

In addition, according to the stacked disk-shaped triboelectric generator generating energy from omnidirectional wind and its operating method according to an embodiment of the present invention, wind power in various directions and speeds can be effectively harvested through the disk-shaped triboelectric generator. It is easy to install and can easily increase output by stacking, so it can serve as a new paradigm by going beyond the limits of existing wind power generators.

On the other hand, the effects obtainable in the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below. You will be able to.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention serve to further understand the technical idea of the present invention, the present invention is limited only to those described in the drawings. and should not be interpreted.
1 is a perspective view of a single disk-shaped triboelectric device generating energy from wind in all directions according to an embodiment of the present invention;
2 is a schematic diagram of rotation of an electrode and a charging sphere according to an embodiment of the present invention;
3 is a plan view showing connection lines between electrodes of a triboelectric device according to an embodiment of the present invention;
4 is an RMS voltage graph at the connection line connecting the first electrode and the fifth electrode in FIG. 3;
5 is a perspective view of a stack-type triboelectric device installed in a small wind tunnel for an experimental example of the present invention;
6 is FEM simulation data in the experimental example of FIG. 5;
7 is a perspective view of a disk-shaped triboelectric device according to an embodiment of the present invention designed for experimental data;
8 is a graph of the RMS voltage of a first electrode and each of the second to eighth electrodes and the angle of an electrode having a curvature in an experimental example of the present invention;
9 is a graph of RMS voltage according to sphere diameter when the material of the sphere is EPS or PTFE in an experimental example of the present invention;
10 is an RMS voltage graph according to the number of spheres at heights of 30 mm, 60 mm, and 120 mm of a triboelectric device in an experimental example of the present invention;
11 is a perspective view of a stacked disc-shaped triboelectric generator generating energy from omnidirectional wind according to an embodiment of the present invention designed for experimental data;
12 is a graph of charging time according to the number of stacks when a capacitor is charged with a current output from a rectifier in an experimental example of the present invention;
13 is a graph of rectified voltage according to wind speed in an experimental example of the present invention;
14 is a perspective view of a state in which the setting angle is 0 degrees, rotated 15 degrees counterclockwise, and rotated 30 degrees according to wind power in an experimental example of the present invention;
FIG. 15 is a rectified voltage graph in FIG. 14 at 0 degree, 15 degree, and 30 degree rotational states.

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content will be thorough and complete and the spirit of the present invention will be sufficiently conveyed to those skilled in the art.

In this specification, when an element is referred to as being on another element, it means that it may be directly formed on the other element or a third element may be interposed therebetween. Also, in the drawings, the thickness of components is exaggerated for effective description of technical content.

Embodiments described in this specification will be described with reference to cross-sectional views and/or plan views, which are ideal exemplary views of the present invention. In the drawings, the thicknesses of films and regions are exaggerated for effective explanation of technical content. Accordingly, the shape of the illustrated drawings may be modified due to manufacturing techniques and/or tolerances. Therefore, embodiments of the present invention are not limited to the specific shape shown, but also include changes in the shape generated according to the manufacturing process. For example, a region shown at right angles may be rounded or have a predetermined curvature. Accordingly, the regions illustrated in the drawings have attributes, and the shapes of the regions illustrated in the drawings are intended to illustrate a specific shape of a region of a device and are not intended to limit the scope of the invention. Although terms such as first and second are used to describe various elements in various embodiments of the present specification, these elements should not be limited by these terms. These terms are only used to distinguish one component from another. Embodiments described and illustrated herein also include complementary embodiments thereof.

Terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. The terms 'comprises' and/or 'comprising' used in the specification do not exclude the presence or addition of one or more other elements.

In describing the specific embodiments below, several specific contents are prepared to more specifically describe the invention and aid understanding. However, readers who have knowledge in this field to the extent that they can understand the present invention can recognize that it can be used without these various specific details. In some cases, it is mentioned in advance that parts that are commonly known in describing the invention and are not greatly related to the invention are not described in order to prevent confusion for no particular reason in explaining the present invention.

Hereinafter, the configuration, function, and operation method of a single disk-shaped triboelectric device 1 and triboelectric generator 100 generating energy from omnidirectional wind according to an embodiment of the present invention will be described.

First, FIG. 1 shows a perspective view of a single disk-shaped triboelectric device generating energy from wind in all directions according to an embodiment of the present invention. And Figure 2 shows a schematic diagram of the rotation of the electrode and the charging sphere according to an embodiment of the present invention.

FIG. 3 is a plan view showing a connection line between electrodes of a triboelectric device according to an embodiment of the present invention, and FIG. 4 shows an RMS voltage graph at a connection line connecting the first electrode and the fifth electrode in FIG. 3 it did

As shown in FIG. 1, a single disk-shaped triboelectric device 1 according to an embodiment of the present invention includes a disk 10, a plurality of guides 20, electrodes 30, and spheres 40. It can be seen that it can be configured.

The disks 10 have a disc shape and are spaced apart from each other in a height direction. In addition, a plurality of disks 10 may be configured to have a stacked shape so as to have spaces between them in the height direction.

A plurality of guides 20 are disposed in the space between the disks 10 . Through the plurality of guides 20, the triboelectric device 1 is rotated with respect to the central point of the disc by the wind in all directions.

Specifically, n guides 20 are arranged vertically in the plane direction, are spaced apart from each other by a specific distance in the circumferential direction of the disk 10, and each guide 20 forms a predetermined angle of 360/n with each other and is installed in a transverse space.

For example, as shown in FIG. 1, it can be seen that eight guides 20 may be installed, and the guides 20 form an angle of 45 degrees to each other and are arranged radially with respect to the space between them.

The electrode 30 is configured to be connected to the inner end of each of these guides 20.

And the filling sphere 40 is interposed in the inner space within the space formed by the plurality of guides 20 . These spheres 40 are made of dielectric. In addition, the sphere 40 may be provided in plurality in the inner space.

That is, according to an embodiment of the present invention, the guide 20 for controlling the flow of wind and the sphere 40 are inserted into the inner space so that the sphere 40 rotates in a constant orbit in the inner space and contacts the part. Electrodes 30 are attached. Spheres based on lightweight dielectric materials are very robust and can operate over a wide range of wind speeds.

The triboelectric device 1 according to the embodiment of the present invention generates a flow of turbulence in the inner space where wind rotates from various directions to a certain direction through the guide 20. And the sphere 40 rotates in a certain orbit within the inner space. Triboelectric charge occurs between the surface of the sphere 40 rotating in a certain orbit and the electrode 30, and electric energy is generated through electrostatic induction.

In addition, the electrode 30 according to an embodiment of the present invention may be configured to have a curvature portion having a specific curvature that is connected to the inner end of the guide 20 and is curved inward. The specific curvature of the electrode 30 is designed to correspond to the aforementioned constant trajectory.

In addition, the triboelectric generator 100 according to the embodiment of the present invention includes n/2 connecting lines 31 connecting one electrode 30 and another electrode 30 in n electrodes 30. It may include a capacitor connected to each connection line 31 to charge the electric charge due to the potential difference.

As shown in FIG. 3, each of the eight electrodes 30 is paired and connected by four connection lines 31, and these connection lines 31 are connected to any one electrode 30 and such an electrode 30. ) and another electrode 30 at an opposite position. And each capacitor may be connected to a battery.

That is, the plurality of electrodes 30 are connected through a connection line (free-standing mode) to convert the time-varying potential into usable energy through the fixed electrode 30 in the sphere 40, which is a moving dielectric. The potential difference between the two electrodes 30 was measured with an oscilloscope, and the eight electrodes 30 consisted of a total of four pairs of electrodes 30, with one pair of electrodes facing each other as shown in FIG. In addition, the output shown in FIG. 4 was measured using the ungrounded method, and the RMS voltage was calculated as shown in FIG. 4 to compare the influence of various factors such as the position of the electrode pair and the wind speed (FIG. 4 shows the 1st and 5th electrodes This is a graph with an output value as an example).

Hereinafter, experimental data for the aforementioned triboelectric device will be described. 5 is a perspective view of a stack-type triboelectric device installed in a small wind tunnel for an experimental example of the present invention. And Figure 6 shows the FEM simulation data in the experimental example of Figure 5.

In the design for the specific experimental example of the present invention, a 3D printer was used to manufacture the material of polylactic acid (PLA), and the outer and inner diameters of the guide 20 were 120 mm and 60 mm, respectively. The bottom plate of the disk 10 and the guide 20 were made of 2 mm thick, and the top plate of the disk 10 was made of a 3 mm thick PMMA plate. Although the above materials have been used for easy fabrication, various materials may be used depending on the purpose of use in the future.

As shown in FIG. 6, the eight guides 20 serve as inlets and outlets for wind flow in the device. These guides 20 can convert the wind into a turbulent flow rotating in a constant direction from various directions. When the sphere 40 rotates in a certain orbit due to this turbulence and guide, triboelectric charge occurs between the surface of the sphere 40 and the electrode 30, as shown in FIG. 2, and charge transfer occurs. In this way, the free charge of the electrode 30 is induced through the electrostatic induction phenomenon, and electrical energy is generated.

That is, in order to derive a clear output result of this device, a simple wind tunnel device was created as shown in FIG. 5 to minimize the effect of wind speed measurement and turbulence generation speed and pressure loss (the ratio of width and height was 5:2). and the height is 120 mm). As a result of running the FEM simulation based on this experimental premise, it was confirmed that turbulence was formed in the device by the wind as shown in FIG. proceed).

7 is a perspective view of a disk-shaped triboelectric device according to an embodiment of the present invention designed for experimental data. In order to derive the optimal output result of this device, as shown in FIG. 7, the angle (α) of the electrode 30, the material, diameter (d), number (N) and height (h) of the device 1 ) was changed. For the optimal experiment, the angle of the electrode 30 was changed from 0 degrees to 20 degrees, the materials of the sphere 40 used were EPS (Expanded polystyrene) and PTFE (Polytetrafluoroethylene), and the diameter was changed from 5 mm to 24 mm, The height of the device (1) (including the top plate) was changed to 30 mm, 60 mm, and 120 mm, and one to many balls were inserted.

8 is a graph showing RMS voltages of the first electrode and each of the second to eighth electrodes and the angle of the curved electrode in the experimental example of the present invention. That is, the angle of the electrode 30 is the angle between the starting point and the end point in the circumferential direction of the curvature of the electrode 30 at the center point of the disk 10, and 2 on the horizontal axis is the voltage between the first electrode and the second electrode, and 3 is the voltage between the first electrode and the second electrode. Between the first electrode and the third electrode, 4 is the voltage between the first electrode and the fourth electrode, 5 is the voltage between the first electrode and the fifth electrode, 6 is the voltage between the first electrode and the sixth electrode, and 7 is the first electrode and the voltage between the seventh electrode, and 8 means the voltage between the first electrode and the eighth electrode.

9 shows a graph of the RMS voltage according to the diameter of the sphere 40 when the material of the sphere 40 is EPS or PTFE in the experimental example of the present invention. 10 shows graphs of RMS voltages according to the number of spheres 40 at heights of 30 mm, 60 mm, and 120 mm of the triboelectric device 1 in the experimental example of the present invention.

11 is a perspective view of a stacked disc-shaped triboelectric generator 100 generating energy from wind in all directions according to an embodiment of the present invention designed for experimental data. FIG. 12 shows a graph of charging time according to the number of stacks when a capacitor is charged with a current output from a rectifier in an experimental example of the present invention. And Figure 13 shows a graph of rectified voltage according to wind speed in an experimental example of the present invention.

That is, FIG. 12 shows the time taken when the capacitor is charged with the rectified output of the device, and the output of the generator 100 stacked through this changes as if it is similar to the output of direct current (DC) when the disks are sequentially stacked, and the charging efficiency It can be seen that this increases effectively. In addition, as shown in the graph shown in FIG. 13, it can be seen that the output increases as the wind speed increases.

14 is a perspective view showing a state in which the setting angle is 0 degree, rotated 15 degrees counterclockwise, and rotated 30 degrees according to wind power in an experimental example of the present invention. FIG. 15 is a rectified voltage graph in FIG. 14 at 0 degree, 15 degree, and 30 degree rotational states.

As in the embodiment of the present invention, since the eight guides 20 have the same shape every 45 degrees, it is possible to collect all wind energy in various directions. Also, as shown in FIG. 15, even within 45 degrees, it can be seen that energy can be harvested from wind in all directions by generating almost the same output.

In addition, the device and method described above are not limited to the configuration and method of the above-described embodiments, but all or part of each embodiment is selectively combined so that various modifications can be made. may be configured.

1: A stacked disc-shaped triboelectric device that generates energy from omnidirectional wind
10: disk
20: Guide
30: electrode
31: connection line
32: rectifier
40: Sphere
100: Stacked disk-shaped triboelectric generator that generates energy from omnidirectional wind

Claims (14)

In the disk-shaped triboelectric device,
discs spaced apart from each other in a height direction; a plurality of guides disposed in the interspace to rotate the triboelectric device with respect to the central point of the disk by omnidirectional wind; electrodes connected to inner ends of each of the guides; And a sphere interposed in the inner space in the interspace formed by the plurality of guides; includes,
Through the guide, a turbulent flow of wind rotating from various directions to a constant direction is generated in the inner space so that the sphere rotates in a constant orbit in the inner space, and between the surface of the sphere rotating in the constant orbit and the electrode. A triboelectric charge occurs and generates electrical energy through electrostatic induction.
The guides are arranged vertically in the plane direction, and the guides are spaced apart from each other at a specific distance in the circumferential direction of the disk, and each guide is installed radially with respect to the space between them at a predetermined angle of 360 / n, The planar direction of each of the guides is in contact with the track, and the gap width between the guides is gradually reduced from the wind inlet to the outlet to the inner space, and the flow speed is increased so that the wind is introduced into the inner space,
The electrode is connected to the inner end of the guide and has a curvature portion curved inwardly having a specific curvature, the specific curvature corresponding to the curvature of the constant trajectory,
When the sphere rotates in a constant orbit due to the turbulence and the guide, triboelectrification occurs between the surface of the sphere and an electrode having a curvature, resulting in charge transfer, and the free charge of the electrode is induced through the electrostatic induction phenomenon. , A disk-shaped triboelectric device that generates energy from omnidirectional wind, characterized in that electrical energy is generated.
delete delete According to claim 1,
The sphere is a disc-shaped triboelectric device that generates energy from omnidirectional wind, characterized in that composed of a dielectric.
delete delete delete According to claim 1,
The disc-shaped triboelectric device for generating energy from the omnidirectional wind, characterized in that the disc has a stack shape to have the space between the plurality in the height direction.
According to claim 1,
The sphere is a disc-shaped triboelectric device that generates energy from omnidirectional wind, characterized in that a plurality is interposed in the inner space.
In the stacked disk-shaped triboelectric generator,
The triboelectric device according to any one of claims 1, 4, and 8 to 9;
n/2 connecting lines connecting one electrode and another electrode in the n electrodes of the triboelectric device; and
A disk-shaped triboelectric generator generating energy from omnidirectional wind, characterized in that it includes; a capacitor connected to each of the connection lines to accumulate electric charge due to a potential difference.
According to claim 10,
A disk-shaped triboelectric generator that generates energy from omnidirectional wind, characterized in that the connection line connects between one electrode and another electrode at a position opposite to the electrode.
According to claim 11,
A disk-shaped triboelectric generator generating energy from omnidirectional wind, further comprising a battery to which each of the capacitors is connected.
In the operating method of the disk-shaped triboelectric generator according to claim 10,
Applying winds in various directions toward the disk-shaped triboelectric device;
rotating the triboelectric device in a specific direction based on the central point of the disk;
Rotating the sphere in a constant orbit within the inner space; and
The operation of a disk-shaped triboelectric generator for generating energy from omnidirectional wind, characterized in that it includes; generating electric energy through electrostatic induction by generating triboelectric charge between the electrode and the surface of a sphere rotating in a constant orbit. method.
According to claim 13,
In the forward wind, characterized in that, in the n electrodes of the triboelectric device, a capacitor connected to each of the n / 2 connection lines connecting one electrode and another electrode accumulates electric charge due to a potential difference. Method of operation of a disk-shaped triboelectric generator that produces energy.

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