KR20130141875A - Piezoelectric harvesting system - Google Patents

Abstract

According to the embodiment of the present invention, a piezoelectric harvesting system includes a moving body applied by an external force of a moving body, a deformation part where one end is fixed to the moving body and the other end is changed by elastic deformation, and a piezoelectric device generating electric energy due to vibration and attached onto the deformation part. The electric energy is efficiently produced by the movement of the moving body and the external force transferred by the moving body.

Description

Piezoelectric Harvesting System {PIEZOELECTRIC HARVESTING SYSTEM}

The following embodiments relate to a piezoelectric harvesting system, and more particularly, to a piezoelectric harvesting system capable of efficiently harvesting electrical energy from various external forces by a moving body.

Recently, the share of energy use in nature is steadily increasing, and the size of power generation is also getting bigger and larger, and the capacity of the power generation system for this is also increasing. In the case of general renewable energy generation, photovoltaic or wind power generation, additional power generation systems are considered in that power generation is unstable due to irregular natural energy and should be installed far from people.

Therefore, superconducting power generation systems have been considered as various types of distributed power sources, but considering the generation efficiency of renewable energy, piezoelectric power generation systems are under development.

The general form of wind power generation is a large propeller installed at a fixed location in a windy place such as a mountainous area to produce electricity and constitute a system of delivering energy to urban areas. In addition, the form of photovoltaic power generation generates electricity by installing a large solar panel in a fixed location in a mountainous area or a sunny place, and constitutes a system of a method of delivering electric power to a required place. Power generation technology using vibration or pressure generally uses ceramic piezoelectric elements to install energy on the floor of trains or highways with high population flows to harvest energy.

Among such power generation methods, a piezoelectric power generation system using a piezoelectric element is a next generation energy source capable of converting energy such as pressure, shock, vibration, etc., which is discarded in everyday life, into electrical energy. Therefore, there is a need to develop a piezoelectric power generation system that minimizes energy loss to increase power generation efficiency and is easy to use.

An object according to an embodiment is to provide a piezoelectric harvesting system capable of efficient power generation under various external forces such as gravity from a moving object such as an animal and vibration caused by the movement of the animal.

An object according to an embodiment is to provide a piezoelectric harvesting system that is portable and convenient to use, and can be efficiently mounted even in a situation where it is hard to be supplied with electricity by attaching it to an externally applied object anywhere.

An object according to an embodiment is to provide a piezoelectric harvesting system with higher energy generation efficiency by vibrating the piezoelectric element as much as possible by external force generated by the movement of a moving object such as an animal.

According to an embodiment, a plurality of piezoelectric elements may be configured in an integrated structure in series or in parallel, or a plurality of piezoelectric elements may be configured in a single layer or a multilayer structure so that a given force may be simultaneously applied to all piezoelectric elements. It is to provide a piezoelectric harvesting system using a maximum power generation in the space.

In the piezoelectric harvesting system according to an embodiment for achieving the above object, the piezoelectric harvesting system is a mobile body that is transmitted to the external force by the mobile body, one end is fixed to the mobile body, the other end is deformed elastic deformation The piezoelectric device may include a piezoelectric element attached to the deformable part to generate electrical energy due to vibration.

According to one side, the mobile body is formed between the first surface receiving the external force transmitted to the mobile body, a second surface disposed below the first surface spaced apart from the first surface, the first surface and the second surface And a support, wherein one end of the deformable part is fixed to the support and arranged parallel to the first surface.

According to one side, one of the first surface or the second surface may be made of an elastic material, the other inelastic material.

According to one side, the deformation portion may be composed of a plurality of flat plates arranged in parallel.

According to one side, further comprising a striking member for impacting the deformable portion, the striking member may be attached to at least one of the moving body or the deformable portion.

According to one side, the mobile body is a first surface movable according to an external force transmitted to the mobile body, a second surface spaced apart from the first surface, one end is attached to the first surface, A spring is connected to the other end and may include a moving member moving up and down, and a striking member formed on a side of the moving member to strike the deformable portion according to the movement of the moving member.

According to one side, the striking member may include a plurality of striking rods attached to the side of the moving member and the striking wings positioned between the striking rod and the deformable portion.

According to one side, the moving body is formed of a fan-shaped housing, one end of the deformable portion is fixed to the central portion of the housing and arranged radially, and comprises a ball beating the other end of the deformable portion at the edge of the housing Can be.

According to the piezoelectric harvesting system according to an embodiment, it is possible to efficiently generate power by receiving various external forces such as gravity from a moving object such as an animal and vibration caused by the movement of the animal.

According to the piezoelectric harvesting system according to an embodiment, it is portable and convenient to use, and it is possible to perform efficient power generation even in a situation where it is difficult to supply electricity by attaching it anywhere to an external force.

According to the piezoelectric harvesting system according to an embodiment, the piezoelectric element may be vibrated as much as possible by external force generated by the movement of a moving object such as an animal, thereby increasing energy generation efficiency more.

According to the piezoelectric harvesting system according to an embodiment, a given force may be simultaneously applied to all piezoelectric elements by configuring a plurality of piezoelectric elements in an integrated structure in series or in parallel, or by configuring a plurality of piezoelectric elements in a single layer or a multilayer structure. Therefore, the maximum generation amount can be obtained in the minimum space.

1 schematically shows a piezoelectric harvesting system according to a first embodiment.
2 illustrates a case in which an external force is applied downward to the piezoelectric harvesting system according to the first embodiment.
3 shows a case where an external force is applied in a downward direction to the piezoelectric harvesting system according to the first embodiment.
4 is a side view of a piezoelectric harvesting system according to a second embodiment.
5 is a side view of a piezoelectric harvesting system according to a third embodiment.
6 is a side view of a piezoelectric harvesting system according to a fourth embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements.

1 schematically shows a piezoelectric harvesting system 10 according to a first embodiment, and FIG. 2 shows a case in which an external force is applied downward to the piezoelectric harvesting system 10 according to the first embodiment. 3 shows a case in which an external force is applied downward from the piezoelectric harvesting system 10 according to the first embodiment.

1 to 3, the piezoelectric harvesting system 10 according to the first embodiment may include a moving body 100, a deformation unit 160, and a piezoelectric element 170.

The moving body 100 is attachable to any place exposed to external force, including gravity, the first surface 110, the second surface 120, the support 130, the striking member 140 and the side 140 may be included.

The first surface 110 is a surface for receiving the external force transmitted to the moving body 100, the second surface 120 is spaced apart in parallel to the first surface (110).

The first surface 110 and the second surface 120 is illustrated as a rectangle, but is not limited thereto, and may include a plane such as a circle or a polygon.

In addition, the material of the first surface 110 and the second surface 120 may be made of an inelastic material, the surface that receives the external force of the two surfaces, otherwise the surface. For example, if the first surface 110 receives the external force, the first surface 110 may be formed of an elastic material, and the second surface 120 may be formed of an inelastic material. Conversely, if the second surface 120 receives the external force, the second surface 120 may be formed of an elastic material, and the first surface 110 may be formed of an inelastic material.

In addition, the distance between the first surface 110 and the second surface 120 will be determined by the size of the moving body to which the moving body 100 is attached.

The support 130 is attached to and fixed to the lower portion of the first surface 110 and the upper portion of the second surface 120, and may be formed to cross in the height direction.

In addition, the material of the support 130 may be formed of an inelastic material that is not deformed, for example, may be made of aluminum.

The side surface 150 of the mobile body 100 may be made of an elastic material that can prevent external moisture. For example, the side surface 150 of the mobile body 100 may be made of a rubber material or a waterproof cloth. That is, when an external force is applied to the first surface 110, a change may occur in the gap between the first surface 110 and the second surface 120, and at this time, the side surface may be flexibly deformed by such a material. have.

One end is fixed to the moving body 100, the other end may include a deformable portion 160 of the elastic material deformed.

In addition, the deformable portion 160 is illustrated as being attached to the support 130, but is not limited thereto, and may be disposed at a position capable of receiving external force from the moving body 100.

The deformable portion 130 or the moving body 100 may further include a striking member 140 to transmit an external force.

Although the striking member 140 is illustrated as a cylinder or a square cylinder, the present invention is not limited thereto, and the strike member 140 may be configured as a polygonal pillar or a cone. In addition, the height of the striking member 140 may be formed to be equal to or slightly larger than the spacing between the plates.

Attached to the top or bottom of the deformation unit 160 may include a piezoelectric element 170 to generate electrical energy by vibrating by an external force transmitted to the moving body 100.

The piezoelectric element 170 may generate a charge when subjected to mechanical vibration or may generate a mechanical vibration when a charge is applied, and basically a polymer having excellent physical flexibility, including a ceramic piezoelectric device having a high generation amount. polymer) or a hybrid piezoelectric element 170 in which a polymer and a ceramic are mixed may be used. Therefore, it is durable due to its excellent physical flexibility, and thus is easy to develop.

In addition, as the type of piezoelectric element 170, the use of PVDF is basic, and may include barium titanate, PZT crystal, or PZT fiber. In addition, lead-free piezoelectric materials such as NKN type, BZT-BCT type, BNT type, BSNN and BNBN type, PLZT, P (VDF-TrFE), quartz, tourmaline, rochelite, barium titanate, Ammonium, tartaric acid ethylenediamine, and the like.

However, the type and material of the piezoelectric element 170 are not limited thereto, and other materials may be used as long as a sufficient amount of power can be generated by an external force applied to the piezoelectric harvesting system 10 according to the first embodiment. Of course it is.

In addition, the piezoelectric element is connected to the rectifying unit (not shown) by a conductive wire (not shown), and thus electrical energy generated by vibration and strike of the piezoelectric element 170 may be transferred to and rectified along the conductive wire.

As the number of piezoelectric elements 170 increases, more electrical energy may be harvested. That is, as the number of flat plates of the deformable portion 160 increases, the number of piezoelectric elements 170 that can be attached also increases, so that greater electric energy can be obtained from the piezoelectric harvesting system 10 according to the first embodiment. Can be.

Referring to FIG. 2, when an external force is applied downward from the top of the first surface 110, the first surface 110 is bent downward by the external force, thereby lowering the first surface 110. The striking member 140 attached to the upper portion of the adjacent deformation portion 160 will bend the deformation portion 160 also downward. Therefore, deformation and vibration such as bending occur in the piezoelectric element 170 attached to the deformation unit 160. At this time, electrical energy is generated by an external force applied to the piezoelectric element 170, and electrical energy is generated by the conductive wire. Can be transferred.

Referring to FIG. 3, when an external force is applied from below, the moving body 100 may be turned upside down in the opposite direction. That is, the second surface 120 may be the upper portion, and the first surface 110 may be the lower portion. The first surface 110 is bent upward by the external force, whereby the striking member 140 attached to the first surface 110 will press the adjacent deformation part 160 and the deformation part 160 will also be bent upward. Therefore, deformation and vibration such as bending occur in the piezoelectric element 170 attached to the deformation unit 160. At this time, electrical energy is generated by an external force applied to the piezoelectric element 170, and electrical energy is generated by the conductive wire. Can be transferred.

Therefore, by attaching the mobile main body 100 to the moving body that can act as well as other external forces of gravity, such as animals or humans, the electric energy can be easily obtained by the piezoelectric element 170 closely attached to the moving body 100. have.

In the following description, the piezoelectric harvesting system 20 according to the second embodiment will be described, but a description thereof will be omitted for parts substantially the same as the piezoelectric harvesting system 10 of the first embodiment.

4 is a side view of the piezoelectric harvesting system 20 according to the second embodiment.

Referring to FIG. 4, the piezoelectric harvesting system 20 according to the second embodiment includes a moving body 200, a deformation unit 260, and a piezoelectric element 270, and the piezoelectric harvesting device according to the first embodiment. It is substantially similar to the casting system 10 with differences in the deformations 260.

The deformable portion 260 may be composed of a plurality of flat plates arranged in parallel, and may be disposed on the same horizontal line or substantially horizontally with the support 230 interposed therebetween.

Therefore, when an external force is applied to the first surface 210, the first member 210 is bent downward and the striking member 240 attached to the lower portion of the first surface 210 is the deformable portion 260. Will hit the nearest plate. Then, such a process is sequentially caused by hitting another adjacent plate by the striking member 240 attached to the lower portion of the deformable portion 260, thereby vibrating the piezoelectric element 270 attached to the deformable portion 260. Will generate electrical energy.

In addition, since the piezoelectric element 270 may be attached to the mobile body 200 by providing the plurality of deformation parts 260, more electric energy may be efficiently harvested.

5 is a side view of the piezoelectric harvesting system 30 according to the third embodiment.

The moving body 300 may include a first surface 310, a second surface 320, a moving part 330, a striking member 340, and a side surface 350.

The moving member 330 may be attached to a lower portion of the first surface 310 and attached to an upper portion of the second surface 320.

The moving member 330 may be formed of a polygonal column including a cylinder and a square column, and the height of the moving member 330 is smaller than a distance between the first surface 310 and the second surface 320. Can be.

In addition, an elastic material, that is, a spring 331 may be disposed between the moving member 330 and the second surface 320.

Therefore, the moving unit 330 moves up and down by the external force when the external force is applied to the first surface 310 in the downward direction, and can react to a small external force by the spring 331, thereby reducing the amount of energy lost. Can be reduced.

The side surface 350 of the mobile body 300 may include an elastic portion 352 and an inelastic portion 354. That is, the portion adjacent to the first surface 310 moving according to the external force may be configured as the elastic portion 352 and the portion adjacent to the second surface 320 as the inelastic portion 354.

The elastic portion 352 may be made of an elastic material that can prevent external moisture. That is, when the deformation occurs due to an external force and a change occurs in the distance between the first surface 310 and the second surface 320, the side surface 350 may be deformed by the material.

In addition, the length of the elastic portion 352 and the non-elastic portion 354 is determined by the compression of the spring 332, the maximum length of the non-elastic portion 354 is the spring 332 attached to the lower portion of the moving part 330 When the maximum compression is possible, the distance between the first surface 310 and the second surface 320 may be determined.

One end is fixed to the inelastic portion 354 of the side surface 350 and may include a deformation portion 360 extending horizontally toward the moving member 330. The deformable portion 360 may be formed of an elastic material, and the piezoelectric element 370 may be attached to the upper or lower portion of the deformable portion 360.

In addition, when an external force is applied, the deformation part 360 is deformed by the striking member 340 formed on the side of the moving member 330 and striking the deformation part 360 according to the movement of the moving member 330. The piezoelectric element 370 can be vibrated.

The striking member 340 may include a plurality of striking rods 342 attached to the side of the moving member 330 and the striking wings 344 positioned between the striking rod 342 and the deformation unit 360. have.

The striking rod 342 may be arranged in a plurality of rows along the longitudinal direction of the movable member 330 while being regularly mounted along the circumferential direction at the side of the movable member 330. Therefore, when an external force is applied, it can be efficiently transmitted to the plurality of hitting wings 344, thus vibration may occur in the hitting wings 344.

In addition, the length of the striking rod 342 has a length partially overlapping the striking wing 344, when the movable member 330 and the striking rod 342 is moved up and down by the external force, by the striking rod 342 The blow wing 344 may be hit.

Although the blow wing 344 is shown as a radial wing formed on a spherical object, but is not limited to this, it may be formed to be hit by the blow rod 342. In addition, the number of the strike blades 344 is not limited to two being formed on both sides of the moving member 330, and may be composed of a plurality including at least one.

As such, in proportion to the strength of the external force, the striking rod 342 or the striking blade 344 of the striking member 340 may strike the piezoelectric element 370 of the deformable portion 360, and thus the electric energy. Can increase the amount of power generated. At this time, the transfer of force from the moving member 330 to the deformable portion 360 is made to improve the amount of electrical energy generated.

6 is a side view of the piezoelectric harvesting system 40 according to the fourth embodiment.

Referring to FIG. 6, substantially similar to the piezoelectric harvesting system according to the first to third embodiments, there are differences in the shape and configuration of the mobile body 400.

The moving body 400 of the piezoelectric harvesting system 40 according to the fourth embodiment may include a fan-shaped housing 410 and a bead 420.

The size of the housing 410 may be freely determined by the size of the moving body to which the moving body 400 is attached, and the material may be formed of an inelastic material that does not cause deformation.

In addition, when the moving body is attached to the moving body and the movement occurs, the housing 410 also moves in a circumferential orbit around the center of the housing 410 as a reference point.

In addition, the edge of the housing 410 may include a bead 420 to hit the end of the deformable portion 430.

The marble 340 may include at least one, and is not limited to the marble 340, and may include a spherical cloud element.

In addition, the diameter of the bead 340 and the length of the deformable portion 320 will be determined thereby, because the end of the deformable portion 320 and a portion of the bead 340 should be formed to overlap each other.

In addition, the weight of the beads 340 will also be determined by the weight of the movable body to which the housing 310 is attached. Specifically, if the weight of the moving body is small, the weight of the housing 310 and the beads 340 will also be formed small. Conversely, if the weight of the moving body is large, the weight of the housing 310 and the beads 340 may also be large.

The housing 410 may include a plurality of deformation parts 430 fixed to a central portion of the housing 410 and arranged in a radial direction.

The deformable portion 430 may be formed of an elastic material, and more deformation occurs as a material having a high modulus of elasticity causes the piezoelectric element 440 attached to the deformable portion 430 to vibrate.

In addition, as the number of the deformable portion 430 and the piezoelectric element 440 increases, more electrical energy may be harvested. Accordingly, the length and the flat plate of the deformable portion 430 may be appropriately proportional to the size of the housing 410. You will need to determine the number of.

Therefore, when a movement occurs in the movable body, the beads 420 will move along the edge of the housing 410, thereby hitting one end of the deformation portion 430, the piezoelectric element attached to the deformation portion 430 Vibration may be applied to 440 to harvest electrical energy.

Through the piezoelectric harvesting system according to the embodiments, it is possible to easily obtain electrical energy by the external force applied to the moving object and the movement of the moving object. In particular, there is a great advantage in that electricity can be obtained if only an external force is applied to the moving body to vibrate the piezoelectric element in a situation where it is difficult to obtain electricity. The simple structure of the piezoelectric harvesting system is economical in terms of cost and may be easy to commercialize.

Although the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made thereto without departing from the scope of the present invention. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

10, 20, 30, 40: piezoelectric harvesting system
100, 200, 300, 400: moving object
110, 210, 310: First page 120, 220, 320: Second page
130, 230: support portion
140, 240, 340: striking member
150, 250, 350: side
160, 260, 360, 430: deformations
170, 270, 370, 440: piezoelectric elements
342: Strike bar 344: Strike Wing 332: Spring
310: housing 340: beads
352: elastic portion 354: inelastic portion

Claims (8)

A mobile body to which external force is transmitted by the mobile body;
One end is fixed to the moving body, the other end is deformed elastically deformed by the external force; And
A piezoelectric element attached to the deformable part to generate electric energy due to vibration;
Piezoelectric harvesting system comprising a. The method of claim 1,
The moving body includes:
A first surface for receiving an external force transmitted to the mobile body;
A second surface spaced apart from the first surface; And
A support portion formed between the first surface and the second surface,
One end of the deformable portion is fixed to the support portion, the piezoelectric harvesting system arranged in parallel to the first surface. 3. The method of claim 2,
One of the first surface or the second surface of the piezoelectric harvesting system consisting of an elastic material, the other inelastic material. The method of claim 1,
And the deformation part comprises a plurality of flat plates arranged in parallel. The method of claim 1,
And a striking member for impacting the deformable portion, wherein the striking member is attached to at least one of the moving body or the deformable portion. The method of claim 1,
The moving body includes:
A first surface movable according to an external force transmitted to the moving body;
A second surface spaced apart from the first surface;
A moving member having one end attached to the first surface and having a spring connected to the other end thereof to move up and down; And
A striking member formed on a side of the movable member to strike a deformation part according to the movement of the movable member;
Piezoelectric harvesting system comprising a. The method according to claim 6,
The striking member includes a plurality of striking rods attached to the side of the movable member and a striking wing positioned between the striking rod and the deformable portion. The method of claim 1,
The moving body is formed of a fan-shaped housing, one end of the deformable portion is fixed to the central portion of the housing and arranged radially, the piezoelectric harvesting system comprising a bead hitting the other end of the deformable portion at the edge of the housing.

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