KR20200106264A - Columnar triboelectric energy harvester for omni-directional wind energy harvesting - Google Patents

Abstract

The present invention relates to a cylindrical triboelectric energy harvester capable of omnidirectional wind energy harvesting. An object of the present invention is to have a simple structure in a form of a circumference and a film surrounding the same, thereby facilitating large-area array manufacturing, and smoothly harvesting energy even in a variety of directions and at low wind speed. The cylindrical triboelectric energy harvester comprises a fixing unit and a moving unit.

Description

Columnar triboelectric energy harvester for omni-directional wind energy harvesting

The present invention relates to an energy harvester, and more specifically, to a columnar triboelectric energy harvester capable of harvesting wind energy in all directions.

Recently, when interest in research on new and renewable energy is increasing worldwide, research to use various energy sources existing in nature by converting them into useful energy that can be used by humans is being conducted very actively. As one of the technologies that is part of this research, energy harvesting is a technology that converts small energy that is easily discarded or not used in everyday life such as vibration, sound waves, heat, motion, and potential energy to be usable electric energy. ), and such a device is called an energy harvester.

The configuration of the energy harvester varies depending on the type of energy to be harvested. Currently, such as generating solar power using the photoelectric effect, generating a spark from a gas range or lighter using the piezoelectric effect, or obtaining the power of a smart band worn on the body using the thermoelectric effect from the body temperature of a person. Various types of energy harvesters have been disclosed and used.

As one of these various energy harvesting technologies, there is an energy harvesting technology using frictional charging. Triboelectrification refers to mechanically dividing charges of opposite signs to each object by mutual interference at the contact surface when objects of different materials are rubbed. At this time, whether each object is charged to either the anode or the cathode is determined by the charging heat. As an example of the heat of charge of generally well-known objects, it is likely to be charged in the order of fur-ivory-glass-silk-wood-rubber-plastic-ebonite. That is, even with the same glass, when the glass rubs against the fur, the glass is negatively charged, and when the glass is rubbed against the wood, the glass is charged positively.

By attaching electrodes to the opposite side of the contact surfaces of these objects and connecting them to each other or to ground, current can be obtained by the following principle. When equilibrium is achieved in the object in a contacted state, the friction surface is charged with a charge of a certain polarity, and the electrode is charged with a compensation charge for the polarity charged to the friction surface. At this time, the moment the charged objects are separated from each other by friction, the electric charge moves through the electrode to generate a current (as is well known, the electric charge movement direction and the electric current direction are opposite). It is the triboelectric energy harvester that uses this principle.

Since the triboelectric energy harvester can be any form as long as a pair of objects with different charging heat are in contact and separated, quite various types of technology are being actively studied. As one of them, there is a technology that uses wind to induce frequent contact between objects and harvests triboelectric energy through this. As an example, in Korean Patent Registration No. 0949146 ("Power Generation Device Using Friction Electricity", 2010.03.16., Patent Document 1), frictional charge energy is achieved by contacting objects made of a material flying in the wind, such as yarn or woven material. A device for harvesting is disclosed. In addition, devices of various structures such as using an array of unidirectional harvesters (Non-Patent Document 1), using a structure such as a flag (Non-Patent Document 2), or using a circular disk structure (Non-Patent Document 3) are disclosed. do. However, the devices disclosed in the prior art document have limitations in that it is difficult to cope with wind in all directions, and that the structure of the device is complicated or the area occupied or the space required for driving is large.

1. Korean Patent Registration No. 0949146 ("Power Generation Device Using Friction Electricity", 2010.03.16)

1. M.-L. Seol, et al., "Vertically stacked thin triboelectric nanogenerator for wind energy harvesting", Nano Energy, vol. 14, pp. 201-208, 2015 2. Z. Zhao, et al., "Freestanding flag-type triboelectric nanogenerator for harvesting high-altitude aind energy for arbitrary directions", ACS Nano, vol. 10, pp. 1780-1787, 2016 3. S.-J. Park, et al., "Self-sustainable wind speed sensor system with omni-directional wind based triboelectric generator", Nano Energy, vol. 55, pp. 115-122, 2019

The present invention was conceived to solve the problems of the prior art as described above, and an object of the present invention is to have a simple structure in the form of a circumference and a film surrounding it, so that a large area and an array are easily manufactured, and various directions And it is to provide a columnar triboelectric energy harvester capable of harvesting wind energy in all directions, which can smoothly harvest energy even at low wind speeds.

Cylindrical triboelectric energy harvester 100 capable of harvesting omnidirectional wind energy of the present invention for achieving the above object comprises: a fixing part 110 having a dielectric layer 115 formed on an outer surface thereof; It may include. More specifically, the columnar frictional charge energy harvester 100, the fixing portion 110 is formed in a vertically extending columnar shape, the electrode body 111 is formed therein, and the moving portion 110 ) Is formed in the form of a film made of a flexible material that is a closed curve, and a conductor layer 125 may be formed on the inner surface. In addition, the columnar triboelectric energy harvester 100 may generate electric energy due to triboelectric charging generated as the contact area between the dielectric layer 115 and the conductor layer 125 is changed by being moved by wind. . In addition, the columnar triboelectric energy harvester 100 includes: a charging unit 130 which is electrically connected to the electrode body 111 and the conductor layer 125 to accumulate electric energy; It may include.

In addition, the moving part 120 may include a connection line 121 at one end connected to an upper end of the fixing part 110 and the other end connected to an upper end of the moving part 120. At this time, the charging unit 130 may have one end electrically connected to the electrode body 111 and the other end electrically connected to the conductor layer 125 through the connection line 121.

In addition, the fixing part 110 includes a separate electrode 112 formed to surround the lower end of the electrode body 111, and an insulating film 113 interposed between the electrode body 111 and the separate electrode 112. ) Can be included. At this time, the charging unit 130 may have one end electrically connected to the electrode body 111 and the other end electrically connected to the conductor layer 125 through the separate electrode 112. In this case, the separate electrode 112 may be formed within a position range in which the lower end of the moving part 120 contacts the lower end of the fixing part 110.

In addition, the moving part 120 may be formed in the form of a film made of a conductor material, or may be formed in the form of a film in which the conductor layer 125 is applied on the inner surface of the support film 122.

In addition, the moving part 120 may be formed in a cylindrical shape having a diameter greater than that of the fixing part 110. Alternatively, the moving part 120 may be formed in the shape of a truncated cone having a minimum diameter greater than the diameter of the fixing part 110 but having a minimum diameter formed at the top.

In addition, the moving part 120 may include a plurality of air resistance bodies 123 protruding from the outer surface of the moving part 120. In this case, the air resistance body 123 may be formed by cutting and bending a portion of the moving part 120.

In addition, the electrode body 111 may include a cylindrical body 111a extending vertically, and an electrode layer 111b formed on an outer surface of the body 111a.

In addition, the charging unit 130 may include a load 135 and a commutator 131 provided at a front end or a rear end of the load 135 to rectify a current.

According to the present invention, since the energy harvester itself has a simple structure, resources such as time, manpower, and cost for manufacturing and installation are greatly reduced. In addition, due to the simplicity of this structure, there is also an effect that it is easy to manufacture a large area form or an array form.

In addition, according to the present invention, there is an effect that wind energy can be harvested in all directions by the structure of the energy harvester itself. In addition, according to the present invention, there is a great effect that energy can be harvested with considerably high efficiency even in a much lower wind speed range than in the past.

1 is a principle of a triboelectric energy harvester.
Figure 2 is a perspective view of the cylindrical triboelectric energy harvester of the present invention.
3 is a cross-sectional view of a columnar triboelectric energy harvester of the present invention.
Figure 4 is an explanatory view of the operating principle of the cylindrical frictional charging energy harvester of the present invention.
5 is a cross-sectional view of a first embodiment of electrical connection between a dielectric layer and a conductor layer.
6 is a cross-sectional view of a second embodiment of electrical connection between a dielectric layer and a conductor layer.
7 is a first and second embodiment of the shape of the moving part.
Figure 8 is an operating state diagram of the first and second embodiments of the moving part shape.
9 and 10 are comparison results of electric energy harvesting in the first and second embodiments of the moving part shape.
11 is an example air resistance body.
12 is a photograph of an experimental example of a cylindrical triboelectric energy harvester of the present invention.
13 is a result of measuring the output voltage according to the wind direction in the experimental example of the cylindrical triboelectric energy harvester of the present invention.
14 is a result of measuring the output voltage according to the wind speed in the experimental example of the cylindrical triboelectric energy harvester of the present invention.

Hereinafter, a columnar triboelectric energy harvester capable of harvesting omnidirectional wind energy according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

[1] Principle of triboelectric energy harvester

1 is a diagram for explaining the principle of a triboelectric energy harvester. The conceptual configuration of a triboelectric energy harvester is shown on the left side of FIG. 1. As shown, the triboelectric energy harvester includes a first electrode, a dielectric disposed on an upper surface of the first electrode, a second electrode disposed above the dielectric, and a load connected between the first electrode and the second electrode. .

First, as shown in Fig. 1①, when a force is applied from the outside to make contact and friction between the dielectric and the second electrode, electrons move from the second electrode made of metal to the dielectric, and the (-) / (+) is charged to the second electrode. At this time, since electrons directly move on the friction surface between the dielectric and the second electrode, no current flows through the load.

Next, as shown in Fig. 1②, when the dielectric and the second electrode are slightly separated from each other, the electrode is in the first electrode to return to the equilibrium state again due to the change in the effect of the polarity of the material on the electrode due to the static induction phenomenon. Free electrons move to the second electrode. That is, at this time, the current flows from the second electrode to the first electrode.

Next, as shown in Fig. 1③, when the dielectric and the second electrode are very far away from each other and out of the range of influence on each other, in the combination of the dielectric and the first electrode, a negative (-) is charged on the friction surface of the dielectric. As a compensation for the first electrode, positive (+) is charged, that is, an equilibrium state is achieved.

Next, as shown in Fig. 1④, when the dielectric and the second electrode approach again, free electrons move from the second electrode to the first electrode so that (+) is charged toward the second electrode. That is, at this time, the current flows from the first electrode to the second electrode.

If the combination of the dielectric material and the first electrode and the second electrode are continuously contacted (friction) and separated, the process as shown in FIGS. 1 ① to ④ as described above is cyclically repeated to generate a continuous current.

[2] Construction of the cylindrical triboelectric energy harvester of the present invention

2-1. Overall composition

FIG. 2 is a perspective view of a columnar frictional charging energy harvester of the present invention, and FIG. 3 is a cross-sectional view of a columnar frictional charging energy harvester of the present invention. As shown in FIGS. 2 and 3, the cylindrical frictional charging energy harvester 100 of the present invention may include a fixing part 110, a moving part 120, and a charging part 130. Hereinafter, each part will be described in more detail.

The fixing part 110 is formed in a cylindrical shape extending vertically as shown. In addition, the fixing part 110 has an electrode body 111 inside and a dielectric layer 115 formed on an outer surface thereof. The electrode body 111 itself may be made of a conductor such as a metal to serve as an electrode, but if the entire electrode body 111 is made to be an electrode, there may be a problem such as an unnecessary increase in electrical resistance. have. Therefore, the electrode body 111, as shown in Figs. 2 and 3, comprises a vertically extending cylindrical body (111a) and an electrode layer (111b) formed on the outer surface of the body (111a). It is desirable to let it go. That is, the body 111a plays a role of supporting the entire device, and the electrode layer 111b performs a role of electrical connection. In this way, when the electrode body 111 is composed of the body 111a and the electrode layer 111b, it is obviously described that an electrical connection is made to the electrode body 111 below. It can be understood that a positive connection is made.

The movable part 120 is formed as a closed curve having a diameter larger than the diameter of the fixing part 110 (here, the'cross-section' refers to a cross section in a direction perpendicular to the axial direction of the fixing part 110) ), it can be said to have a roughly cylindrical shape, but is not limited to a cylindrical shape. In addition, the moving part 120 is formed in the form of a film made of a flexible material, and is disposed to surround the fixing part 110 as shown. According to such a shape and structure, the moving part 120 can be easily moved by wind, that is, random friction and contact between the inner surface of the moving part 120 and the outer surface of the fixing part 110 by wind And separation can occur frequently.

In addition, although it is shown in the drawing that the moving part 120 is connected to the fixing part 110 by a connection line 121, the present invention is not limited thereto, and the connection line 121 is omitted. It's okay. This will be described in more detail later in the detailed configuration description of the electrical connection.

In addition, a conductor layer 125 is formed on the inner surface of the moving part 120. In this case, the moving part 120 may itself be formed in the form of a film made of a conductor material, such as a thin metal plate. In this case, since the entire moving part 120 is made of a conductor material, of course, the inner surface of the moving part 120 is made of a conductive material, and thus the inner surface of the moving part 120 directly serves as the conductor layer 125. Alternatively, the moving part 120 may be formed in the form of a film in which the conductor layer 125 is applied on an inner surface of a separate support film 122.

Here, the electrode body 111 (or the electrode layer 111b) of the fixing part 110 corresponds to the first electrode in FIG. 1, and the dielectric layer 115 corresponds to the dielectric in FIG. 1. . In addition, the conductor layer 125 of the moving part 120 corresponds to the second electrode in FIG. 1. That is, as described above, when the moving part 120 is moved by wind, electric energy is generated by frictional charging generated as the contact area between the dielectric layer 115 and the conductor layer 125 is changed.

The charging unit 130 is electrically connected to the electrode body 111 and the conductor layer 125 to store electric energy. In this case, the charging unit 130 may include a load 135 and a commutator 131 provided at a front end or a rear end of the load 135 to rectify a current, as shown in FIG. 3.

4 is a view for explaining the principle of operation of the columnar frictional charging energy harvester of the present invention, a view of the columnar frictional charging energy harvester 100 of the present invention viewed from above.

When the wind does not blow as shown in FIG. 4(A), as described above, the moving part 120 has an upper end connected by the fixing part 110 and the connection line 121, The upper end near the portion of the connection line 121 is in contact with the fixing part 110 and is stopped in a draped shape. When the wind blows in this state, the moving part 120 moves as shown in FIG. 4(B) or 4(C). In particular, as described above, the moving part 120 is made of a flexible material. Therefore, it changes flexibly and randomly so that the cross-sectional shape becomes approximately ellipse according to the wind speed.

Originally, when the wind blows from the front of the circumference, a repetitive vortex is formed around the circumference. As described above, the position and shape of the moving part 120 also change flexibly and randomly according to the wind. The influence of the is more intensified. Therefore, the moving part 120 vibrates while in contact with the fixed part 110, and the fixed part 110 and the moving part 120 through repeated vibration of the moving part 120 As friction occurs between the two, the contact area changes repeatedly and randomly. Accordingly, electric energy can be harvested according to the frictional charge energy harvesting principle described above.

As can be seen intuitively from FIG. 4, the cylindrical frictional charging energy harvester 100 of the present invention can be driven completely regardless of the direction in which the wind blows due to the characteristic of the columnar shape. Accordingly, the present invention has a great advantage in that it is possible to drive against wind in all directions, unlike the conventionally limited wind directions that can be driven by the shape and structure of the device.

In addition, since the cylindrical frictional charging energy harvester 100 of the present invention has a fairly simple structure, resources such as manufacturing and installation time, manpower, and cost can be greatly reduced. In addition, due to the simplicity of this structure, it is easy to manufacture a large-area form or an array form unlike the conventional one.

2-2. Detailed configuration: electrical connection

Hereinafter, various embodiments of the electrical connection between the electrode body 111 and the conductor layer 125 will be described.

5 shows a cross-sectional view of a first embodiment of electrical connection between a dielectric layer and a conductor layer. As shown in FIG. 5, in the first embodiment of electrical connection, an additional component is further included in the moving part 120. That is, at this time, the moving part 120 further includes a connection line 121 at one end connected to the upper end of the fixed part 110 and the other end connected to an upper end point of the moving part 120. As described above, although the connection line 121 is shown in FIGS. 2 and 3, etc., the connection line 121 is not necessarily included, and in the second embodiment to be described below, the connection line 121 does not exist. It's okay. In addition, in the drawings, the fixing part 110 and the moving part 120 are shown in a form that is separated from each other for better understanding, but in reality, the moving part 120 moves in a wide variety according to how the wind blows. Therefore, the arrangement is not limited to FIG. 5. Specifically, the moving part 120 may be spaced apart from the fixed part 110 as shown in the position where the connection line 121 is connected, and the moving part 120 is the fixed part 110 ) May be in oblique contact, the moving part 120 may be in contact with the fixed part 110 in the entire vertical direction, etc., in fact, the moving part 120 relative to the fixed part 110 The arrangement of the can be changed in various ways. However, the connection line 121 serves to hold the vertical position of the moving part 120 in addition to electrical connection, so that the contact between the dielectric layer 115 and the conductor layer 125 can be made more smoothly. .

In addition to these additional configurations, the charging unit 130 according to the first embodiment has one end electrically connected to the electrode body 111, and the other end is electrically connected to the conductor layer 125 through the connection line 121. It is connected by While it is very easy to implement a direct electrical connection to the electrode body 111, the conductor layer 125 is formed as a substantially very thin layer and continues to move due to the driving characteristics of the moving part 120, It is a little difficult to implement a direct electrical connection to the conductor layer 125. At this time, the connection line 121 is easy to implement to be connected to the conductor layer 125, and when the connection line 121 is formed of a conductor material such as a metal wire, the other end of the charging unit 130 is the connection line. By making it physically connected to 121, as a result, it is possible to realize electrical connection with the conductor layer 125 by riding the connection line 121.

In the drawings, the other end of the charging unit 130 is shown to be connected to the middle of the connection line 121, but this is only for facilitating circuit illustration, and thus the configuration of the present invention is not limited thereto. In actual implementation, it is natural that the end of the connection line 121 fixed to the fixing part 121 may be variously changed according to convenience, such as holding the end of the connection line 121 fixed to the other end of the charging part 130.

The configuration of the first embodiment of the electrical connection has an advantage that electrical connection can be easily realized with a very simple structure. However, in this case, the material of the connection line 121 should be limited to a conductor material such as a metal wire, and due to the environmental characteristics in which the columnar friction charging energy harvester 100 is installed, the connection line 121 is deteriorated due to exposure to external moisture. There may be a problem such as a disconnection or an accumulation of rust, foreign matter, etc. resulting in a decrease in electrical conductivity. In order to solve this problem, a second embodiment of electrical connection in which other additional components can be added but a more stable electrical connection can be achieved will be described below.

6 shows a cross-sectional view of a second embodiment of electrical connection between a dielectric layer and a conductor layer. As shown in FIG. 6, in the second embodiment of electrical connection, an additional component is further included in the fixing part 110. That is, at this time, the fixing part 110 is interposed between a separate electrode 112 formed to surround the lower end of the electrode body 111, the electrode body 111, and the separate electrode 112 It further includes an insulating film 113 for insulating the body 111 and the separate electrode 112. On the other hand, in the drawings, the dielectric layer 115 and the conductor layer 125 are shown to be spaced apart in order to clearly express the arrangement of each part, but in reality, the moving part 120 is made of a flexible material, so it is easy to change its shape. The conductor layer 125 is in contact with the separate electrode 112 at the lower side and at the same time the conductor layer 125 is in contact with the separate electrode 112 at the lower side due to the influence of wind pressure or the attraction between the dielectric layer 115 and the conductor layer 125 due to static electricity. It may be in contact with the dielectric layer 115.

In addition to this additional configuration, the charging unit 130 according to the second embodiment has one end electrically connected to the electrode body 111, and the other end is connected to the conductor layer 125 through the separate electrode 112. It is electrically connected. That is, in the second embodiment of electrical connection, as long as the lower end of the moving part 120 is in physical contact with the separate electrode 112, the other end of the charging part 130 is physically connected to the separate electrode 112 As a result, it is possible to achieve electrical connection with the conductor layer 125 by riding the separate electrode 112. Of course, in order to implement this structure, the separate electrode 112 must be formed within a position range in which the lower end of the moving part 120 contacts the lower end of the fixing part 110.

As shown in FIG. 2 and the like, the moving part 120 has a shape slightly larger in diameter than the fixed part 110, but when the wind blows, the moving part is pushed by the wind as shown in FIG. When the wind blows, at least one point on the inner surface of the moving part 120 always comes into contact with the fixing part 110. At this time, since the separate electrode 112 is formed to surround the outer surface of the fixing part 110, that is, when the wind blows, the moving part 120 must be at least at one point of the separate electrode 112 It is physically contacted, so it is possible to smoothly harvest electrical energy (without the configuration of the connection line 121 in the first embodiment of electrical connection).

2-3. Detailed configuration: moving part shape

Hereinafter, various embodiments of the shape of the moving part 120 will be described.

Fig. 7 shows the first and second embodiments of the moving part shape, and Fig. 8 shows the operation state diagrams of the first and second embodiments of the moving part shape, respectively. In more detail, Figs. 7(A) and 8(A) show the shape and operation state of the first embodiment in the shape of the moving part, and Figs. 7(B) and 8(B) show the shape of the moving part in the second embodiment. And an operating state.

The moving part 120 according to the first embodiment has a diameter of the fixing part 110, more specifically the electrode body 111, as shown in FIGS. 7(A) and 8(A). It is formed in a cylindrical shape larger than the diameter of. This shape has the advantage of being the simplest and easiest to manufacture, and in particular, good performance can be achieved in combination with the first embodiment of electrical connection. However, when the first embodiment of the moving part shape and the second embodiment of electrical connection are combined, the following problems may occur. As described above, in the second embodiment of electrical connection, the connection line 121 does not exist. That is, if there is no connection line 121 that serves to hold the vertical position of the moving unit 120, the moving unit 120 may move in the vertical direction in the state of FIG. 8A. Accordingly, friction may occur as if the lower end of the moving part 120 is in contact with the ground and dragged, which significantly interferes with the vibration between the moving part 120 and the fixed part 110. As described above, as the moving part 120 vibrates in contact with the fixed part 110 due to turbulence, the contact area between the conductor layer 125 and the dielectric layer 115 is changed. Harvesting of electric energy occurs. If the vibration of the moving part 120 is disturbed, as a result, electric energy harvesting may not be performed smoothly.

The moving part 120 according to the second embodiment, as shown in FIGS. 7(B) and 8(B), has a minimum diameter of the fixing part 110, more specifically, the electrode body 111 It is larger than the diameter of ), but is formed in the shape of a truncated cone with the minimum diameter formed at the top. When the second embodiment of the moving part shape and the second embodiment of electrical connection are combined, as shown in FIG. 8(B), when the wind blows, the moving part 120 in the shape of a truncated cone is inclined, and the moving part The entire surface of the wind 120 is in contact with the fixing unit 110. When the second embodiment of the moving part shape and the second embodiment of electrical connection are combined, the lower end of the moving part 120 is in contact with the ground on the side where the wind blows (front) as shown in FIG. 8(B). Even if it does, since the lower end of the moving part 120 is always lifted from the rear, contact with the ground is fundamentally excluded. Accordingly, the vibration disturbance phenomenon due to contact with the ground as described above does not appear, and thus electric energy can be harvested very smoothly without the connection line 121. 9 and 10 show the moving part shape in the first embodiment (cylindrical shape, denoted as “Flat” in Figs. 9 and 10) and the second embodiment (truss shape, denoted as “Tapered” in Figs. 9 and 10). As a result of comparison of electric energy harvesting, it is proved that electric energy can be harvested very excellently even without the connecting line 121 in the case of the second embodiment of the moving part shape.

In the cylindrical triboelectric energy harvester 100 of the present invention, since the moving part 120 harvests electric energy as it is moved by wind, the moving part 120 can be more affected by wind. It is preferable to be configured in a form. To this end, it is preferable that the moving part 120 includes a plurality of air resistance bodies 123 protruding from the outer surface of the moving part 120 to increase air resistance.

The air resistance body 123 may be implemented in a form in which a separate structure is attached to the outer surface of the moving part 120, but in this case, the weight of the moving part 120 is increased, In response to the wind, it may have an adverse effect. The air resistance body embodiment of FIG. 11 is designed in consideration of this point, and the air resistance body 123 according to the embodiment of FIG. 11 is formed by cutting and bending a part of the moving part 120. By doing this, air resistance can be effectively increased without unnecessarily increasing the weight of the moving part 120.

[3] Experimental results of the cylindrical triboelectric energy harvester of the present invention

Hereinafter, a result of performing an experiment through an experimental example of the cylindrical triboelectric energy harvester of the present invention will be described.

12 is a photograph of an experimental example of the cylindrical triboelectric energy harvester of the present invention. As shown, the electrode body 111 of the fixing part 110 is composed of the body 111a and the electrode layer 111b. The connection line 121 is made of an Ag wire (electrical connection first embodiment), and the moving part 120 itself is formed in the form of a film made of a conductor material and also formed in a cylindrical shape (moving part shape It was manufactured in the form of Example 1). The fixed part 110 had a diameter of 25 mm and the movable part 120 had a height of 50 mm, and the movable part 120 had a diameter of 30, 35, and 40 mm.

13 is a result of measuring the output voltage according to the wind direction in the experimental example of the cylindrical triboelectric energy harvester of the present invention, and the measurement was performed when the wind blows in 12 directions at intervals of 30 degrees. As the diameter of the moving part 120 increases, it can be seen that the overall output voltage increases. In addition, it can be seen that a fairly constant output voltage is generated for wind in all directions.

14 is a result of measuring the output voltage according to the wind speed in the experimental embodiment of the cylindrical triboelectric energy harvester of the present invention. Likewise, it can be seen that the overall output voltage increases as the diameter of the moving part 120 increases. . In addition, it can be confirmed that the output voltage is generated even at a very low wind speed of about 2m/s.

As described above, it was confirmed through an experiment that the columnar triboelectric energy harvester 100 of the present invention can effectively respond to omnidirectional and ultra-low speed winds, compared to conventional energy harvesters using wind. .

The present invention is not limited to the above-described embodiments, and the scope of application thereof is diverse, as well as anyone with ordinary knowledge in the field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. Of course, various modifications are possible.

100: columnar energy harvester
110: fixing part 111: electrode body
111a: body 111b: electrode layer
112: separate electrode 113: insulating film
115: dielectric layer
120: moving part 121: connecting line
122: support film 123: air resistance
125: conductor layer
130: charging unit 131: commutator
135: load

Claims (16)

A fixing part 110 having a dielectric layer 115 formed on the outer surface thereof;
A moving part 120 having a cross section larger than the diameter of the fixing part 110 and disposed to surround the fixing part 110 to generate electric energy by frictional charging;
Cylindrical triboelectric energy harvester, characterized in that it comprises a.
The method of claim 1, wherein the cylindrical frictional charge energy harvester (100),
The fixing part 110 is formed in a cylindrical shape extending vertically, and an electrode body 111 is formed therein,
The movable part 110 is formed in the form of a film made of a flexible material having a closed curve, and a conductor layer 125 is formed on an inner surface of the columnar triboelectric energy harvester.
The method of claim 2, wherein the cylindrical frictional charge energy harvester (100),
A columnar frictional charge energy harvester, characterized in that generating electric energy by frictional charge generated as the contact area between the dielectric layer 115 and the conductor layer 125 is changed by being moved by wind.
The method of claim 2, wherein the cylindrical frictional charge energy harvester (100),
A charging unit 130 electrically connected to the electrode body 111 and the conductor layer 125 to accumulate electrical energy;
Cylindrical triboelectric energy harvester, characterized in that it comprises a.
The method of claim 2, wherein the moving part 120,
One end is connected to the upper end of the fixing unit 110, the other end is a connection line 121 connected to the upper end of the moving unit 120
Cylindrical triboelectric energy harvester comprising a.
The method of claim 5, wherein the charging unit 130,
One end is electrically connected to the electrode body 111,
The other end is a cylindrical triboelectric energy harvester, characterized in that electrically connected to the conductor layer 125 through the connection line 121.
The method of claim 2, wherein the fixing part 110,
A separate electrode 112 formed to surround the lower end of the electrode body 111,
The insulating film 113 interposed between the electrode body 111 and the separate electrode 112
Cylindrical triboelectric energy harvester comprising a.
The method of claim 7, wherein the charging unit 130,
One end is electrically connected to the electrode body 111,
The other end is a columnar triboelectric energy harvester, characterized in that electrically connected to the conductor layer (125) through the separate electrode (112).
The method of claim 8, wherein the separate electrode (112),
Columnar frictional charging energy harvester, characterized in that the lower end of the moving part 120 is formed within a position range in contact with the lower end of the fixed part 110.
The method of claim 1, wherein the moving part 120,
Formed in the form of a film made of a conductor material, or
Columnar frictional charging energy harvester, characterized in that formed in the form of a film in which the conductor layer 125 is applied on the inner surface of the support film 122.
The method of claim 1, wherein the moving part 120,
Cylindrical friction charging energy harvester, characterized in that the diameter is formed in a cylindrical shape larger than the diameter of the fixing portion (110).
The method of claim 1, wherein the moving part 120,
Cylindrical friction charging energy harvester, characterized in that formed in the shape of a truncated cone having a minimum diameter larger than the diameter of the fixing portion 110 but having a minimum diameter formed at the top.
The method of claim 1, wherein the moving part 120,
A plurality of air resistance bodies 123 protruding from the outer surface of the moving part 120
Cylindrical triboelectric energy harvester, characterized in that it comprises a.
The method of claim 13, wherein the air resistance body (123),
Cylindrical friction charging energy harvester, characterized in that formed by cutting and bending a portion of the moving part 120.
The method of claim 2, wherein the electrode body 111,
A cylindrical body 111a extending vertically,
The electrode layer 111b formed on the outer surface of the body 111a
Cylindrical triboelectric energy harvester comprising a.
The method of claim 4, wherein the charging unit 130,
Load 135,
A commutator 131 provided at the front or rear end of the load 135 to rectify current
Cylindrical triboelectric energy harvester, characterized in that it comprises a.

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