CN110224635B - Multi-direction energy harvesting device - Google Patents
Multi-direction energy harvesting device Download PDFInfo
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- CN110224635B CN110224635B CN201910485173.XA CN201910485173A CN110224635B CN 110224635 B CN110224635 B CN 110224635B CN 201910485173 A CN201910485173 A CN 201910485173A CN 110224635 B CN110224635 B CN 110224635B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/185—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using fluid streams
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
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Abstract
The invention provides a multi-direction energy harvesting device which comprises a support, at least one group of multi-degree-of-freedom vortex-induced vibration generating mechanism, a plurality of piezoelectric plate groups and an energy collecting circuit, wherein the multi-degree-of-freedom vortex-induced vibration generating mechanism comprises a blunt body and at least two cantilever beams which are sequentially arranged from bottom to top, the uppermost cantilever beam is fixed on the support, the cantilever beams are arranged in a staggered and non-overlapping mode in the projection direction of the length, each piezoelectric plate group comprises piezoelectric plates which are uniformly distributed on each cantilever beam, and each piezoelectric plate is connected with the energy collecting circuit. The device widens the fluid locking area, improves the utilization efficiency of environmental fluid, reduces the critical wind speed of vortex forming, and is more favorable for popularization and application.
Description
Technical Field
The invention relates to a wind energy collecting device, in particular to a multi-direction energy harvesting device.
Background
In recent years, environmental energy collectors have attracted wide attention of researchers at home and abroad, can continuously convert energy in various forms (solar energy, vibration energy, fluid kinetic energy and the like) in the environment into electric energy, have the remarkable advantages of small volume, long service life, high energy density and the like, and have potential application prospects in the aspects of wireless sensor networks, self-powered systems and the like.
Wind energy is widely available in the environment as a clean renewable energy source. Compared with other environmental energy collection technologies in several forms, research on the wind energy collection technology starts late, and a plurality of key scientific and technical problems exist in the aspects of basic theory, structural design and processing and the like.
Unlike large wind generators, miniature wind energy collectors are not intended for grid connection, and a typical application is to power miniature self-powered systems.
In the initial research period, the research on the structure of the miniature wind energy collector is basically focused on the miniaturization direction of the rotary large-scale wind driven generator, and the structure has two problems: firstly, the structure is complex, and the processing and installation of the micro structure are difficult; and secondly, the friction force and material fatigue of the bearing are more obvious under the microscale, and the reliability and the working efficiency are low. Later, researchers combined wind-induced vibration structures with vibration energy harvesters to create miniature wind energy harvesters based on wind-induced vibration effects.
The wind-induced vibration structure vibrates under the action of wind and is used for collecting wind energy, such as a vortex-induced vibration cylinder, a flutter wing-shaped structure, a flexible membrane and the like, and then the vibration energy of the wind-induced vibration structure is converted into electric energy by the vibration energy collector. Compared with a rotating structure, the miniature wind energy collector based on the wind-induced vibration effect has a relatively simple structure and low cost, and becomes a main development trend of the miniature wind energy collector.
The conventional wind-induced vibration power generation device mainly has the defects of overlarge randomness of the wind direction of breeze, narrow locking area, low utilization efficiency and over-single wind direction. In order to solve this problem, an ideal technical solution is always sought.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a multi-direction energy harvesting device which is simple in structure, convenient to install, easy to control coaxiality and good in product quality.
In order to achieve the purpose, the invention adopts the technical scheme that: the multi-direction energy harvesting device comprises a support, at least one group of multi-degree-of-freedom vortex-induced vibration generating mechanism, a plurality of piezoelectric plate groups and an energy collecting circuit, wherein the multi-degree-of-freedom vortex-induced vibration generating mechanism comprises a bluff body and at least two cantilever beams which are sequentially arranged from bottom to top, the uppermost cantilever beam is fixed on the support, the cantilever beams are arranged in a non-overlapping mode in the projection direction of the length, each piezoelectric plate group comprises piezoelectric plates which are uniformly distributed on each cantilever beam, and each piezoelectric plate is connected with the energy collecting circuit.
Basically, the cantilever beam is a thin sheet structure with elasticity and width.
Basically, the angles formed by the intersection of the cantilever beams in the projection direction of the length are equally divided.
Basically, the cantilever beam comprises two cantilever beams, and the angle formed by the two cantilever beams crossing in the projection direction of the length is 90 degrees.
Basically, all the cantilever beams are connected together through connecting pieces.
Basically, the bluff body is in a polyhedral structure.
Basically, the bluff body is a cylinder, a tapping triangular prism or a triangular prism.
Basically, the piezoelectric sheet is a PVDF piezoelectric sheet or a PZT piezoelectric sheet.
Basically, each multi-degree-of-freedom vortex-induced vibration generating mechanism is arranged on the bracket in rows or columns or in arrays.
Basically, each cantilever beam is provided with at least one piezoelectric sheet, and the at least one piezoelectric sheet is arranged along the length direction of the cantilever beam.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly, the invention connects a plurality of cantilever beams between the bluff body and the bracket, and the cantilever beams have different installation angles, so that the cantilever beams face different directions, when breeze blows, at least one cantilever beam in the cantilever beams with different angles can be matched with the wind direction, thereby meeting the requirement of the bluff body on vortex-induced vibration, and the cantilever beams have the capability of enhancing the bluff body vibration, thereby improving the utilization efficiency of wind energy.
Furthermore, the plurality of cantilever beams arranged at different angles above the bluff body reduce the critical wind speed formed by the vortex, and the range of the locking area is widened.
Furthermore, the multi-degree-of-freedom vortex-induced vibration generating mechanisms are arranged on the support in rows or columns or in arrays to form a small energy collecting system, so that the requirement of small-range power utilization is met.
Drawings
FIG. 1 is a schematic structural diagram of a multi-directional energy harvesting device according to the present invention.
FIG. 2 is a second schematic structural diagram of the multi-directional energy harvesting device of the present invention.
Figure 3 is a top view of a cantilever beam structure in other embodiments.
Fig. 4 is a schematic diagram of the piezoelectric sheet and an external circuit.
Figure 5 is a first order modal simulation of the upper cantilever.
Figure 6 is a first order modal simulation result for the lower cantilever.
In the figure: 1. a support; 2. a blunt body; 3. a cantilever beam; 4. a piezoelectric sheet; 5. a connecting member; 6. an energy harvesting circuit.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
As shown in fig. 1 and 2, the multi-direction energy harvesting device comprises a support 1, two sets of multi-degree-of-freedom vortex-induced vibration generating mechanisms, a plurality of piezoelectric plate groups and an energy collecting circuit, wherein each multi-degree-of-freedom vortex-induced vibration generating mechanism comprises a cylindrical blunt body 2 and two cantilever beams 3 which are sequentially arranged from bottom to top, and the two cantilever beams 3 and the blunt body 2 are connected together through connecting pieces.
The uppermost cantilever beams 3 are fixed on the bracket 1, and the cantilever beams 3 are arranged in a crossed and non-overlapping manner along the projection direction of the length, in the embodiment, the angle formed by the two cantilever beams 3 crossed along the projection direction of the length is 90 degrees. The cantilever beam can enhance the turbulent flow of the bluff body, promote the formation of the rear vortex of the bluff body and meet the requirement of bluff body vortex-induced vibration in different incoming flow directions.
The piezoelectric patch group comprises piezoelectric patches 4 which are uniformly distributed on each cantilever beam, each cantilever beam is provided with at least one piezoelectric patch 4, and the at least one piezoelectric patch is arranged along the length direction of the cantilever beam. As shown in fig. 4, each piezoelectric sheet 4 is connected to the energy collecting circuit 6, which is a conventional known technology and is not developed in detail in this embodiment.
In this embodiment, the cantilever 3 has a sheet structure with elasticity and width, and the piezoelectric element 4 is a PVDF piezoelectric element or a PZT piezoelectric element.
The working principle is as follows: when breeze or other fluid passes through the surface of the bluff body 2, vortices are formed behind the bluff body 2, the vortices alternately shed at a certain frequency to cause air swirl, and when the shedding frequency of the vortices is the same as the natural frequency of the bluff body 2, resonance is generated. At the moment, the vibration of the blunt body drives the cantilever beam to synchronously swing, the cantilever beam bends in the swinging process, the force generated by bending acts on the piezoelectric sheet group and deforms the piezoelectric sheet group, and positive and negative charges are formed on the surface of the piezoelectric sheet group so as to generate current which is collected by the energy collecting circuit 6.
As shown in fig. 5 and 6, the first-order mode simulation results of the upper cantilever and the lower cantilever are respectively shown, which show that the natural frequencies are 5.64Hz and 16.95Hz, respectively, and when the vibration frequency of the bluff body reaches the corresponding natural frequencies, the structure will resonate, which is consistent with the data measured by the experiment.
The wind energy is converted into electric energy through the piezoelectric device, and compared with traditional power generation modes such as hydroelectric power, thermal power and nuclear power, the wind energy-driven generator has the advantages of no pollution, sustainability, strong power generation capacity and the like.
In the process, because the cantilever beams 3 are installed in a cross mode, no matter how the flow direction of the fluid is, one cantilever beam 3 can be stressed and bent to form effective vibration, the utilization efficiency of the device to the environmental fluid is improved, and the locking area is widened.
In other embodiments, if the wind direction is relatively stable, the crossing angle between the cantilever beams 3 can be set according to the wind direction to optimally adapt to the fluid flow direction in the environment, promote the formation of vortices, generate higher lift force, and effectively reduce the critical flow rate of the cylindrical vortex induced vibration.
In other embodiments, there are more than two cantilever beams, and the angle formed by the intersection of the cantilever beams in the projection direction of the length is equally divided, as shown in fig. 3, when there are four cantilever beams, the included angle between the cantilever beams is set to 45 °.
In other embodiments, the bluff body has a polyhedral structure. Such as a triangular prism or a triangular prism.
In the industrial application process, the multiple-degree-of-freedom vortex-induced vibration generating mechanisms are arranged on the support in rows or columns or in arrays, so that the frequency locking range is widened, the requirement on the wind speed is reduced, the influence on ecology is reduced by collecting wind energy in a vibration piezoelectric mode, and the efficient and green collection of the wind energy is realized; the energy storage device is matched with the micro-electromechanical system and the wireless sensor network system for use, so that uninterrupted power supply can be realized for the micro-electromechanical system and the wireless sensor network system. The problems that the traditional propeller type wind driven generator technology is large in occupied area, high in early-stage investment cost, low in wind energy conversion efficiency, greatly limited by geographical positions, difficult to popularize and seriously influenced to birds and poultry are solved.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (1)
1. A multi-directional energy harvesting device is characterized in that: the multi-degree-of-freedom vortex-induced vibration generating mechanism comprises a support, a plurality of groups of multi-degree-of-freedom vortex-induced vibration generating mechanisms, a plurality of piezoelectric plate groups and an energy collecting circuit, wherein the multi-degree-of-freedom vortex-induced vibration generating mechanisms comprise a blunt body and two cantilever beams which are sequentially arranged from bottom to top, the blunt body is in a strip shape and is vertically arranged, and the blunt body is a cylinder or a triangular column;
the cantilever beams at the upper ends are fixed on the support, the two cantilever beams are connected together through a connecting piece, the angle formed by the two cantilever beams in the projection direction of the length is 90 degrees, and the cantilever beams are of a sheet structure with elasticity and width;
the piezoelectric patch group comprises piezoelectric patches which are uniformly distributed on two cantilever beams, each cantilever beam is provided with a plurality of piezoelectric patches, the piezoelectric patches are distributed along the length direction of the cantilever beam, and each piezoelectric patch is connected with the energy collecting circuit;
the piezoelectric sheet is a PVDF piezoelectric sheet or a PZT piezoelectric sheet;
and the multiple-degree-of-freedom vortex-induced vibration generating mechanisms are arranged on the bracket in rows or columns or in arrays.
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| CN201910485173.XA CN110224635B (en) | 2019-06-05 | 2019-06-05 | Multi-direction energy harvesting device |
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| CN201910485173.XA CN110224635B (en) | 2019-06-05 | 2019-06-05 | Multi-direction energy harvesting device |
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| CN110224635B true CN110224635B (en) | 2020-12-25 |
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| CN103516258B (en) * | 2013-08-21 | 2015-09-09 | 南京航空航天大学 | Windbell-type piezoelectric power generation device |
| CN103762895B (en) * | 2014-02-17 | 2015-11-18 | 重庆大学 | A kind of external wall piezoelectric type wind power generation system |
| CN107733285A (en) * | 2017-11-20 | 2018-02-23 | 西北工业大学 | One kind is used for underwater omnidirectional position vortex-induced vibration TRT |
| CN107947636B (en) * | 2017-12-27 | 2024-01-19 | 南京邮电大学 | Six-dimensional piezoelectric energy collector and manufacturing method thereof |
| CN108365775B (en) * | 2018-04-24 | 2020-04-03 | 湘潭大学 | Multi-direction vibration piezoelectric energy collection device |
| CN109538416A (en) * | 2018-10-30 | 2019-03-29 | 北京临近空间飞行器系统工程研究所 | A kind of wind power generation plant based on oval cross section bar vortex-induced vibration characteristic |
| CN109787512B (en) * | 2019-03-12 | 2020-06-09 | 哈尔滨工业大学 | Vertical tandem arrangement type piezoelectric energy harvester for increasing coupling effect |
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