KR101748222B1 - Wind Energy Harvester - Google Patents

Abstract

One aspect of the present invention relates to a wind energy harvester, and more particularly, to a wind energy harvester, wherein the flap is deformed by the wind to change a contact area between the substrate and the flap, thereby harvesting energy through charge transfer by triboelectrification Energy harvester.
The wind energy harvester according to an embodiment of the present invention is simple in structure in the form of a single plate and can be harvested in response to the wind blowing in a direction parallel to the surface of the harvester substrate as well as in the direction perpendicular to the surface Do. In other words, it is possible to harvest energy in response to various winds.

Description

Wind Energy Harvester

One aspect of the present invention relates to a wind energy harvester, and more particularly, to a wind energy harvester, wherein the flap is deformed by the wind to change a contact area between the substrate and the flap, thereby harvesting energy through charge transfer by triboelectrification Energy harvester.

The contents described in this section merely provide background information on the embodiment of the present invention and do not constitute the prior art.

Triboelectric energy harvester is a device that converts mechanical energy into usable electric energy by utilizing electrostatic induction phenomenon by friction contact. Triboelectricity occurs when two different materials with different electronegativity make contact or noncontact.

The structure of the wind energy harvester using the existing friction charging is largely divided into three types: a harvester utilizing a windmill structure such as a wind turbine, a harvester which vibrates a film fixed on one side in the form of a flag inside the tube, And a harvester using two thin plates.
The harvester of the windmill structure is formed by Shuwen Chen, Ya Yang, a harvester that vibrates the fixed film in the shape of a flag on the inside of the tube, and Harvestor, which uses two thin flat plates connected by a spring, as disclosed by Min-Hsin Yeh have.

The harvester of the windmill structure is capable of harvesting energy in response to winds in various directions parallel to the plane, but has a complicated structure including a rotating part, a difficulty in electrode formation, and a large volume of the device.

Harvesters using pipes and films are relatively simple in structure, but there is a limit to the direction of wind that can harvest energy, and it is difficult to make large area and array type.

Lastly, the harvester using the spring-connected flat plate is made transparent using transparent material, but it needs a great driving force and there is a restriction on the installation direction of the harvester.

 Shuwen Chen, "Self-powered cleaning of air pollution by wind driven triboelectric nanogenerator ", Nano Energy, 14, 217 (2015) Ya Yang, "Triboelectric Nanogenerator for Harvesting Wind Energy and as Self-Powered Wind Vector Sensor System ", ACS Nano, 7, 9461 (2013) Min-Hsin Yeh, "Motion-Driven Electrochromic Reactions for Self-Powered Smart Window System," ACS Nano, 5, 4757 (2015)

Accordingly, it is an object of the present invention to provide a friction-type wind energy harvester using a flap structure made of a plastic deformed flexible polymer film.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

In order to achieve the above-mentioned object, a wind energy harvester according to an aspect of the present invention may include a substrate.

The substrate is formed of a flexible material so as to be deformed in shape by wind, one side is attached to the substrate as a fixed end, and the other side is free And a flap that contacts or is in contact with the substrate by raising or lowering the substrate.

And an electrode attached to at least one of the flap and the substrate,
Further, the flap may have a gap formed outwardly from the substrate such that the contact area with the substrate is changed when the other area is raised or lowered by the wind.

The other side region may be configured to include an arc shape bent outward so that the contact area with the substrate continuously changes.

At least one of the contact area where the other side area of the flap and the substrate are in contact with each other may be configured to form the nanostructure so that the surface area is increased. The electrode may be formed on the opposite surface of the contact surface.

The thickness of the flap may be made thinner than the substrate.

The flap may be formed of a polymer material, and the substrate may be formed of a Teflon (PTFE) material. However, the present invention is not limited to this material, and the material of the substrate may be formed of various materials having different electronegativity besides PTFE.

The pair of electrodes may be formed on an outer surface of the flap and an outer surface of the substrate, respectively. In some embodiments, both electrodes need not be formed on the outer surface, but may be formed on the outer surface of the flap and the inner surface of the substrate, respectively, or on the inner surface of the flap and the outer surface of the substrate, respectively.

The pair of electrodes may be formed of aluminum (Al) and copper (Cu), respectively, according to an embodiment. However, the material is not limited to this material and may be formed of a material such as a metal or a conductive polymer which is a conductor in addition to aluminum and copper.

According to another aspect of the present invention, there is provided a liquid crystal display comprising: a first film;

The first film is made of a flexible material so as to be deformed by the wind, and a part thereof is attached to the first film as a fixed end, and the remainder is a free end which is raised or lowered by wind A second film contacting or not contacting the first film; And

An electrode formed on at least one of the first film and the second film;

Wherein the second film has a gap formed outwardly from the first film so that a contact area with the first film changes when the free end portion is raised or lowered by the wind An energy harvester can be provided.

As described above, the wind energy harvester according to an embodiment of the present invention has a simple structure in the form of a single plate, and can be used not only for winds running in a direction parallel to the surface of a harvester substrate but also for winds in a direction perpendicular to the surface It is possible to harvest energy. In other words, it is possible to harvest energy in response to various winds.

By controlling the bending stiffness of the flap structure, the energy can be harvested in response to low wind speeds, and the bending stiffness of the flap structure can be maintained to maintain the bending stiffness.

In addition, the effects of the present invention have various effects such as excellent durability according to the embodiments, and such effects can be clearly confirmed in the description of the embodiments described later.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description of the invention given above, serve to provide a further understanding of the technical idea of the present invention. And should not be construed as limiting.
1 schematically shows a wind energy harvester according to an embodiment of the present invention.
Figure 2 shows a wind energy harvester operating in accordance with an embodiment of the present invention.
3 shows a manufacturing process for manufacturing a wind energy harvester according to an embodiment of the present invention.
Figure 4 shows a wind energy harvester in which a plurality of flaps are arranged in an array in accordance with an embodiment of the present invention.
5 shows a structure of a wind energy harvester in which a substrate is formed into a cylindrical shape.

Hereinafter, an embodiment of the present invention will be described in detail with reference to exemplary drawings.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the size and shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the constitution and operation of the present invention are only for explaining the embodiments of the present invention, and do not limit the scope of the present invention.

First, a wind energy harvester according to an embodiment of the present invention will be described as follows.

1 schematically shows a wind energy harvester according to an embodiment of the present invention. Referring to FIG. 1, a wind energy harvester 10 according to an embodiment of the present invention may include a substrate 200.

Also, the substrate 200 is made of a flexible material so as to be deformed by the wind and has a difference in electronegativity from the substrate 200. One side region is attached to the substrate 200 and the other side is connected to the substrate 200 And a flap 100 that is plastic-deformed to produce energy by contact and non-contact with the substrate 200 to form a gap with the substrate 200.

And electrodes 130 and 210 attached to at least one of the flap 100 and the substrate 200.

In the wind energy harvester 10 according to the embodiment of the present invention, the substrate 200 and the flap 100 may be formed of different materials having different electronegativity. The other side region of the substrate 200 and the flap 100 forms a constant gap. This gap is formed by plastic deforming the other side region of the flap 100 to maintain a constant shape.

The material of the substrate 200 may be a flexible material, or may be a rigid material. It is possible to use elastic material such as fabric (silk, wool, cotton), paper in addition to plastic film and polymer material as flexible material. In addition, rigid materials such as glass, wood, and acrylic can be used, and various electrode materials can be used.

The flap 100 is formed in the form of a flexible film. It can therefore be deformed by the wind. The bending stiffness of the flap 100 is adjustable considering the wind speed of the hovering wind. For example, the flap 100 having a low bending stiffness may be applied to deform the flap 100 even at low wind speeds. The material of the flap 100 according to an embodiment of the present invention may be flexible It can be one material. For example, a plastic film or a polymer material. Specific examples thereof include polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyethylene (PE), ethylene vinyl acetate (EVA), polydimethylsiloxane (PDMS), polyimide (PI), nylon and Teflon.

According to the embodiment, the material of the flap 100 and the substrate 200 can be transparently formed. In this case, energy can be harvested while the function of transmitting light is maintained even if it is attached to a window of a building.

The thinner the thickness of the flap 100, the lower the flexural rigidity. The flap 100 according to one embodiment of the present invention may have a thickness between 40 micrometers (μm) to 60 micrometers (μm), depending on the embodiment, to have a thickness of 50 micrometers (μm) Can be produced. When the thickness of the flap 100 is less than 40 micrometers (μm), it is difficult to maintain the shape due to plastic deformation. In addition, when the thickness of the flap 100 is larger than 60 micrometers (μm), continuous energy harvesting is difficult for winds having various wind speeds because it is deformed only for winds having wind speeds higher than a predetermined value.

The other side of the wind energy harvester 10 according to the embodiment of the present invention may be configured to include an arc shape bent outward so that the contact area with the substrate 200 continuously changes.

Here, when the substrate 200 is horizontally positioned, the other side of the flap 100 having one side region attached to the upper surface of the substrate 200 is curved in the direction toward the upper surface of the substrate 200 It can mean that it is. The curved shape of the flap 100 may have an arc shape in cross section.

One side region of the flap 100 may include an arc shape, and one side region and the other side region of the flap 100 may be formed so as to naturally and continuously have the same curvature.

The other area of the flap 100 may be plastic deformed by plastic working so that its cross section includes an arcuate shape. However, the range of the cross-sectional shape of the flap 100 is not limited to the arc shape.

Figure 2 shows a wind energy harvester operating in accordance with an embodiment of the present invention. 2 (b) shows a state in which the wind is blown toward the inner surface of the flap 100, and FIG. 2 (c) shows a state in which the wind blows in the flap 100 100 of the first embodiment.

Referring to FIG. 2B, in the present embodiment, the other side of the flap 100 is configured to include an outwardly curved arc shape, so that the flap 100 is deformed by wind blowing toward the inner side of the flap 100, (See Fig. 2 (b)). When the wind is stopped, the flap 100 and the substrate 200 are spaced apart from each other, The flap 100 can be restored and brought into contact with the substrate 200, and power can be harvested.

2 (c), in the present embodiment, the other area of the flap 100 is formed to include an arc shape bent outwardly, so that the flap 100 is formed by the wind blowing toward the other side of the flap 100, The gap between the flap 100 and the substrate 200 is narrowed, the contact area continuously increases, and energy is continuously harvested.

When the other area of the flap 100 is in a straight line shape, the contact area of the other area contacts with the entire area of the substrate 200 or does not contact with the entire area, And the intensity of the wind must be equal to or higher than the threshold value to start deforming, resulting in contact with the substrate 200.

However, in the present embodiment, the other side region of the flap 100 is configured to include an arc shape bent outwardly so that the energy can be continuously collected even if the wind strength is low. Energy can be harvested even for small winds, so that energy can be continuously harvested for winds of various intensities.

In addition, in the present embodiment, the other side region of the flap 100 is configured to include an arc shape bent outwardly, so that it deforms against winds blowing in various directions. Therefore, Energy can be harvested continuously.

At least one of the contact areas where the other side of the flap 100 and the substrate 200 are in contact with each other may be configured to form the nanostructure 120 such that the surface area is increased. That is, the nanostructure 120 can be formed on the polymer film 110 as a main body of the flap 100 by an electrical or chemical method. According to the embodiment, the nanostructure 120 may be formed on the contact surface on the flap 100 side, but may be formed on the contact surface on the substrate 200 side.

The nanostructure 120 according to the present embodiment can make large contact with the flap 100 when the substrate 100 and the substrate 200 are in contact with each other, so that a large amount of energy can be harvested.

The electrode 130 may be formed on the opposite side of the contact surface on the flap 100 side. That is, the nanostructure 120 may be formed on one side of the flap 100, and the electrode 130 may be formed on the other side.

The thickness of the flap 100 may be smaller than the thickness of the substrate 200. The substrate 200 may be a portion attached to an outer wall of a building or a window, and may be thicker than the flap 100 to perform a function of fixing the harvester.

According to an embodiment of the present invention, the electrodes 130 and 210 are paired, and the pair of electrodes 130 and 210 are respectively connected to the outer surface of the flap 100 and the outer surface of the substrate 200 And the pair of electrodes 130 and 210 may be formed of aluminum (Al) and copper (Cu), but the present invention is not limited thereto.

(Ni fabric, silver yarn, etc.) coated with conductive polymer (PEDOT: PSS, etc.), conductive nanowire, and nanoparticle in addition to general metals (aluminum, nickel, copper, silver, gold, platinum, Can be used.

A wind energy harvester according to another embodiment of the present invention includes a first film;

Wherein the first film has a difference in electronegativity from the first film, a part of the first film is attached to the first film and the remainder is bent outward so as to gradually move away from the first film by plastic deformation, A second film formed on the first film; And

And an electrode formed on at least one of the first film and the second film.

3 shows a manufacturing process for manufacturing a wind energy harvester according to an embodiment of the present invention. 3 (a) to 3 (d) illustrate a process of manufacturing the flap 100 of the present invention. First, the manufacturer can prepare a PET film 110 having a thickness of about 50 micrometers (See Fig. 3 (a)). Thereafter, the nano structure 120 for increasing the surface area can be formed on one surface of the PET film 110 through the RIE process (see FIG. 3 (b)). The electrode 130 may be formed on the opposite side of the surface on which the nanostructure 120 is formed by sputtering or the like to complete the flap 100 (see FIG. 3 (c)). Here, the material of the electrode 130 may be aluminum (Al). Then, the flap 100 is heated at a predetermined temperature or higher to plastic-deform the finished flap 100 so that the shape of the flap 100 may include an arc shape bent outward (see FIG. 3 (d)).

Here, the heating temperature may be about 80 degrees (占 폚) to 100 degrees (占 폚). If the heating temperature is lower than 80 ° C., the plastic deformation takes a long time and the curvature is not changed. If the heating temperature is higher than 100 ° C., the flat of the polymer material is not plastically deformed to a desired shape . Depending on the embodiment, the heating temperature may be about 90 degrees (占 폚).

Finally, an electrode 210 is formed on the lower surface of the substrate 200 by sputtering or the like, and the plastic-deformed flap 100 is attached to the upper surface of the substrate 200 to form a wind energy harvester 10) (see Fig. 3 (e)). Here, the material of the electrode 210 formed on the lower surface of the substrate 200 may be copper (Cu).

Figure 4 shows a wind energy harvester in which a plurality of flaps are arranged in an array in accordance with an embodiment of the present invention.

Meanwhile, the wind energy harvester 10 according to an embodiment of the present invention may include a plurality of flaps 100, and the plurality of flaps 100 may be arranged in an array form. In this case, the plurality of flaps 100 may be connected to each other, and the electrodes formed on the outer surface of each of the plurality of flaps 100 may be formed of one electrode.

Since the wind energy harvester including the flap array structure according to the present embodiment can be easily manufactured in a large area, a large amount of energy can be harvested, and the wind energy harvester can be manufactured in accordance with the size of the outer wall and the window of the building.

5 shows a structure of a wind energy harvester in which a substrate is formed into a cylindrical shape.

Referring to FIG. 5, according to another embodiment of the present invention, the cross section of the flap 100 may include a straight line shape. In this case, the substrate 200 may be configured to include an arc shape bent outwardly so that the area of contact with the flap 100 continuously changes.

The substrate 200 is bent outwardly by the substrate 200 so that the substrate 200 is gradually widened from the flap 100 while the flap 100 and the substrate 200 are separated from each other. May be curved in the direction toward the lower surface of the substrate 200. [0064]

The curved shape of the substrate 200 may have an arc shape in cross section. According to the embodiment, the substrate 200 may be formed into a cylindrical shape (see FIG. 5).

According to another embodiment, the flap 100 and the substrate 200 may both be formed to be bent in directions opposite to each other. That is, both the flap and the substrate may have an arc shape in cross section, and each of them may be formed to include an arc shape by plastic deformation.

The above description is only illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

The embodiments disclosed in the present invention are not intended to limit the scope of the present invention and are not intended to limit the scope of the present invention.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: Wind Energy Harvester
100: flap
110: polymer film
120: nanostructure
130: Electrode formed on the upper surface of the flap
200: Substrate
210: Electrodes formed on the substrate bottom surface

Claims (9)

Substrate;
The substrate is formed of a flexible material so as to be deformed by the wind, one side region is attached to the substrate as a fixed end, and the other side is a free end which is raised or lowered by wind A flap in contact with and in contact with the substrate; And
And an electrode attached to at least one of the flap and the substrate,
Wherein the flap has a gap formed outwardly from the substrate such that an area of contact with the substrate when the other area is raised or lowered by the wind is changed. The method according to claim 1,
And the other side region includes an arc shape bent outward so that the contact area with the substrate continuously changes. The method according to claim 1,
Wherein at least one of the other side region of the flap and the contact surface where the substrate contacts each other forms a nanostructure to increase the surface area. The method according to claim 1,
Wherein the thickness of the flap is thinner than the substrate. delete delete The method according to claim 1,
The pair of electrodes being a pair,
An outer surface of the flap and an outer surface of the substrate,
An outer side surface of the flap and an inner side surface of the substrate,
And an inner surface of the flap and an outer surface of the substrate. delete A first film;
The first film is made of a flexible material so as to be deformed by the wind, and a part thereof is attached to the first film as a fixed end, and the remainder is a free end which is raised or lowered by wind A second film contacting or not contacting the first film; And
And an electrode formed on at least one of the first film and the second film,
Wherein the second film has a gap formed outward from the first film so that a contact area of the free end portion with the first film is changed when the free end portion is raised or lowered by the wind.

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