CN110943645A - Multi-resonance piezoelectric energy collector with frequency-up conversion function - Google Patents
Multi-resonance piezoelectric energy collector with frequency-up conversion function Download PDFInfo
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- CN110943645A CN110943645A CN201911244791.1A CN201911244791A CN110943645A CN 110943645 A CN110943645 A CN 110943645A CN 201911244791 A CN201911244791 A CN 201911244791A CN 110943645 A CN110943645 A CN 110943645A
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- 239000000725 suspension Substances 0.000 claims abstract description 7
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- 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
- H02N2/188—Vibration harvesters adapted for resonant operation
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Abstract
The invention relates to a multi-resonance piezoelectric energy collector with frequency-up conversion, which comprises a piezoelectric energy collecting module, a power transmission module and a cover plate, wherein: the piezoelectric energy acquisition module is provided with a cantilever type substrate and a piezoelectric sheet; the power transmission module is provided with a poking sheet which is used for poking the suspension end of the cantilever type substrate and can be arranged in a rotating mode, a gear which is coaxial with the poking sheet and acts synchronously, a rack which is meshed with the gear, a sliding groove which is used for guiding the rack to move and a first spring which is connected between the rack and the sliding groove; the cover plate is used for receiving external excitation, the cover plate can act the external excitation on the rack along the length direction of the sliding groove through the transmission column, and a second spring used for resetting the cover plate is arranged between the cover plate and the sliding groove. Compared with the prior art, the invention converts the external low-frequency input into the high-frequency vibration of the cantilever beam of the piezoelectric energy acquisition module, and the piezoelectric energy acquisition module is excited for multiple times, thereby improving the energy acquisition efficiency and increasing the electric energy output.
Description
Technical Field
The invention relates to the field of energy collection, in particular to a multi-resonance piezoelectric energy collector with frequency-up conversion.
Background
With the development of independent working systems with low energy consumption and low power such as micro-mechanical technology, embedded devices, wireless sensor networks and the like, the self-power supply requirement of independent power sources is more and more strong. Nowadays, most devices are powered by a traditional mode of batteries, and the traditional mode has a series of problems of short service life, frequent replacement and the like. To solve this problem, long-term research has been conducted to convert environmental energy into electrical energy. Therefore, energy harvesting technology has become one of the hot spots in research today.
Energy harvesting is a technology of converting energy existing in the surrounding environment into electric energy and storing the electric energy in an energy storage device, and the energy source of the energy harvesting technology can include energy sources which are available in nature and are not utilized, and mainly includes heat energy, sound energy, kinetic energy, light energy, tidal energy, wind energy and the like. Vibration is ubiquitous in the living environment. When the equipment such as automobiles, trains, subways, airplanes and the like runs, vibration can be generated. Mechanical vibration energy is therefore a ubiquitous source of energy. Thus, current energy harvesters are primarily studied in terms of mechanical vibration energy harvesting.
The mechanical vibration energy collection is mainly to convert mechanical energy in the environment into electric energy by using a vibration energy collector. The vibration energy harvester is divided into: electromagnetic, electrostatic, piezoelectric, and magnetostrictive. The piezoelectric energy collector has the advantages of simple structure, high energy density, no electromagnetic interference, small volume, low cost and the like. Therefore, the piezoelectric energy harvester is the most widely studied. However, the existing piezoelectric energy collector has limited application range, small application value and poor practicability.
Disclosure of Invention
The applicant finds that the conventional piezoelectric energy collector has the problems of difficulty in matching the resonant frequency with the environmental vibration frequency, low utilization rate of the environmental vibration energy, low conversion efficiency and the like, so that the application range is limited, the application value is low and the practicability is poor.
The invention aims to overcome the defects of the prior art and provide a multi-resonance piezoelectric energy collector with frequency-up conversion.
The purpose of the invention can be realized by the following technical scheme:
a multi-resonant piezoelectric energy harvester with frequency up-conversion, comprising:
the piezoelectric energy acquisition module is provided with a cantilever type base plate and a piezoelectric piece arranged along the length direction of the cantilever type base plate, the power transmission module is provided with a rotatable shifting piece for shifting the suspension end of the cantilever type base plate, a gear which is coaxially arranged with the shifting piece and synchronously acts, a rack which is meshed with the gear, a chute for guiding the rack to move and a first spring which is connected between the rack and the chute,
the cover plate is used for receiving external excitation, the cover plate can act the external excitation on the rack along the length direction of the sliding groove through the transmission column, and a second spring used for resetting the cover plate is arranged between the cover plate and the sliding groove.
Preferably, the cantilever type base plate further comprises a vertical plate, one end of the cantilever type base plate is a suspension end, the other end of the cantilever type base plate is a fixed end, and the fixed end is fixed on the vertical plate through a clamping plate.
Preferably, the power transmission module further comprises a rotating shaft, a bearing and a bearing seat, the shifting piece and the gear are arranged on the rotating shaft in a penetrating mode, and two ends of the rotating shaft are rotatably connected with the bearing seat through the bearing.
Preferably, the base is further included and is used for bearing the sliding groove, the bearing seat and the vertical plate.
Preferably, the cantilever-type substrate is horizontally arranged, and two piezoelectric patches are arranged on the upper surface and the lower surface of the cantilever-type substrate respectively.
Preferably, the chute is a vertical chute, the cover plate covers the vertical plate and the chute, and the second spring is further arranged between the vertical plate and the cover plate.
Preferably, the transmission post be the stand, the top and the apron of stand are connected, the bottom of stand passes the spout top, stretches into in the spout to can act on the top of rack.
Preferably, the first spring is an extension spring and is arranged between the top end of the sliding groove and the top end of the rack, and the second spring is a compression spring.
Preferably, the number of the gears is two, the gears are respectively arranged on two sides of the shifting piece, each gear is meshed with one rack, each rack is arranged in two sliding grooves which are arranged in parallel, and a first spring is arranged between each rack and each sliding groove.
The up-conversion in the invention refers to converting the low-frequency vibration excited by the outside into the high-frequency vibration of the piezoelectric energy acquisition module; the multi-resonance refers to that the plectrum continuously rotates back and forth to excite the piezoelectric energy acquisition module to generate resonance for many times. In particular: under the excitation of the cover plate excited by the outside, the power transmission module is excited by the cover plate, and a first spring (taking an extension spring as an example) connected with the rack is stretched, so that the outside excitation energy is converted into elastic potential energy, and after the outside excitation disappears, the first spring drives the rack to do resonant motion together. After the rack generates resonance, the resonance is transmitted to a gear meshed with the rack, the gear and the shifting piece which are coaxially arranged are driven to continuously rotate back and forth, the angle of the back and forth rotation of the shifting piece is smaller than 180 degrees, and the back and forth rotation of the shifting piece continuously excites the piezoelectric energy acquisition module. The piezoelectric energy acquisition module is excited by the plectrum and generates self-resonance, and then converts the vibration energy into electric energy.
Compared with the prior art, the invention has the following beneficial effects:
(1) the power transmission module adopted by the multi-resonance piezoelectric energy collector with the frequency-up conversion function can convert external excitation energy into elastic potential energy of the spring, temporarily stores the energy, and after the external excitation disappears, the spring drives the rack to perform resonant motion together.
(2) According to the invention, the gear meshed with the rack and the shifting piece coaxial with the gear are continuously rotated back and forth by the resonance motion of the rack, so that the piezoelectric energy acquisition module is excited for multiple times to generate resonance, and the energy is converted into electric energy.
(3) According to the invention, the external low-frequency input is converted into the high-frequency vibration of the cantilever beam of the piezoelectric energy acquisition module, and the piezoelectric energy acquisition module is excited for multiple times, so that the energy acquisition efficiency is improved, and the electric energy output is increased.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic front view of the present invention;
FIG. 3 is an exploded schematic view of the power transmission module of the present invention;
fig. 4 is an exploded view of a piezoelectric energy harvesting module of the present invention.
In the figure, 1 is a cover plate, 2 is a transmission column, 3 is a second spring, 4 is a power transmission module, 41 is a chute, 42 is a first spring, 43 is a rack, 44 is a gear, 45 is a plectrum, 46 is a rotating shaft, 47 is a bearing, 48 is a bearing seat, 5 is a piezoelectric energy collecting module, 51 is a piezoelectric plate, 52 is a cantilever type base plate, 6 is a vertical plate, and 7 is a base.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
A multi-resonance piezoelectric energy collector with frequency up-conversion function is disclosed, as shown in fig. 1-4, and comprises a piezoelectric energy collecting module 5, a power transmission module 4 and a cover plate 1, wherein:
the piezoelectric energy collection module 5 has a cantilever-type substrate 52 and a piezoelectric sheet 51 arranged along the length direction of the cantilever-type substrate 52; the power transmission module 4 is provided with a rotatable shifting sheet 45 for shifting the suspension end of the cantilever type base plate 52, a gear 44 which is coaxially arranged with the shifting sheet 45 and synchronously acts, a rack 43 engaged with the gear 44, a chute 41 for guiding the rack 43 to move and a first spring 42 connected between the rack 43 and the chute 41; the cover plate 1 is used for receiving external excitation, the cover plate 1 can enable the external excitation to act on the rack 43 along the length direction of the sliding groove 41 through the transmission column 2, and a second spring 3 used for resetting the cover plate 1 is arranged between the cover plate 1 and the sliding groove 41.
Preferably, the multi-resonant piezoelectric energy collector with frequency up-conversion further comprises a vertical plate 6, one end of the cantilever type base plate 52 is a suspension end, and the other end is a fixed end which is fixed on the vertical plate 6 through a clamping plate 53. It is further preferable that the cantilever-type substrate 52 is horizontally disposed, and two piezoelectric sheets 51 are provided, respectively on the upper and lower surfaces of the cantilever-type substrate 52, as shown in fig. 1, 2 and 4.
As shown in fig. 3, it is preferable that two gears 44 are provided, each gear 44 is separated from each other by a shifting piece 45, each gear 44 is engaged with one rack 43, each rack 43 is provided in two sliding grooves 41 arranged in parallel, and a first spring 42 is provided between each rack 43 and the sliding groove 41. It is further preferred that spout 41 is vertical spout, and apron 1 covers in riser 6 and spout 41 top, and riser 6 and spout 41 are located the below of the relative both sides of apron 1 respectively, also is equipped with second spring 3 (preferably second spring 3 is two, and with two first spring 42 phase-matchs) between riser 6 and apron 1, and further preferably has the multi-resonance piezoelectric energy collector of frequency-raising conversion and still includes base 7 for bear spout 41, bearing frame 48 and riser 6. Preferably, the transmission column 2 is a vertical column, the top end of the vertical column is connected with the cover plate 1, and the bottom end of the vertical column penetrates through the top of the sliding groove 41, extends into the sliding groove 41, and can act on the top end of the rack 43. Further preferably, the power transmission module 4 further includes a rotating shaft 46, a bearing 47 and a bearing seat 48, the shifting piece 45 and the gear 44 are arranged on the rotating shaft 46 in a penetrating manner, and two ends of the rotating shaft 46 are rotatably connected with the bearing seat 48 through the bearing 47. More preferably, the first spring 42 is an extension spring and is disposed between the top end of the slide groove 41 and the top end of the rack 43, and the second spring 3 is a compression spring, as shown in fig. 2 and 3.
As shown in fig. 1 and 2, the cover plate 1 is an externally excited force-receiving portion (the second spring 3 (a compression spring in the figure) connected to the cover plate 1 causes the pressed cover plate 1 to return to its original position), and at the same time, the pillar 2 connected to the cover plate 1 moves down along with the cover plate 1 and finally contacts with the top of the rack 43 to push the rack 43 to move down, so that the first spring 42 (an extension spring in the figure) connected to the rack 43 is extended, and after the external force action disappears, the first spring 42 drives the rack 43 to perform a resonant motion together. After the rack 43 generates resonance, the resonance is transmitted to the gear 44 engaged with the rack, and the gear 44 and the shifting piece 45 which are coaxial are driven to rotate back and forth continuously, so that the shifting piece 45 continuously excites the piezoelectric energy acquisition module 5 to generate high-frequency self-resonance, and the energy is converted into electric energy. According to the invention, low-frequency vibration excited by the outside is converted into high-frequency vibration of the piezoelectric energy acquisition module 5, and single excitation of the outside is converted into reciprocating resonance of the sliding block 41 and multiple resonance motions of the piezoelectric energy acquisition module 5, so that the energy acquisition efficiency is improved, and the output of electric energy is increased.
The embodiments described above are intended to facilitate the understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (8)
1. A multi-resonant piezoelectric energy harvester with frequency up-conversion, comprising:
a piezoelectric energy harvesting module (5) having a cantilever-type substrate (52) and a piezoelectric sheet (51) disposed along a length direction of the cantilever-type substrate (52),
the power transmission module (4) is provided with a rotatable plectrum (45) for poking the suspension end of the cantilever type base plate (52), a gear (44) which is coaxial with the plectrum (45) and acts synchronously, a rack (43) meshed with the gear (44), a chute (41) for guiding the rack (43) to move and a first spring (42) connected between the rack (43) and the chute (41),
the cover plate (1) is used for receiving external excitation, the cover plate (1) can enable the external excitation to act on the rack (43) along the length direction of the sliding groove (41) through the transmission column (2), and a second spring (3) used for resetting the cover plate (1) is arranged between the cover plate (1) and the sliding groove (41).
2. The multi-resonance piezoelectric energy collector with frequency up-conversion function according to claim 1, further comprising a vertical plate (6), wherein one end of the cantilever-type base plate (52) is a suspension end, and the other end is a fixed end which is fixed on the vertical plate (6) through a clamping plate (53).
3. The multi-resonance piezoelectric energy collector with frequency up-conversion function according to claim 2, wherein the power transmission module (4) further comprises a rotating shaft (46), a bearing (47) and a bearing seat (48), the poking sheet (45) and the gear (44) are arranged on the rotating shaft (46) in a penetrating manner, and two ends of the rotating shaft (46) are rotatably connected with the bearing seat (48) through the bearing (47).
4. The multi-resonance piezoelectric energy collector with frequency up-conversion function according to claim 2 or 3, wherein the cantilever-type substrate (52) is horizontally arranged, and the two piezoelectric sheets (51) are respectively arranged on the upper surface and the lower surface of the cantilever-type substrate (52).
5. The multi-resonance piezoelectric energy collector with frequency up-conversion function according to claim 2 or 3, wherein the sliding groove (41) is a vertical sliding groove, the cover plate (1) is covered above the vertical plate (6) and the sliding groove (41), and the second spring (3) is further arranged between the vertical plate (6) and the cover plate (1).
6. The multi-resonance piezoelectric energy collector with frequency up-conversion function according to claim 5, characterized in that the transmission column (2) is a vertical column, the top end of the vertical column is connected with the cover plate (1), and the bottom end of the vertical column passes through the top of the sliding groove (41), extends into the sliding groove (41), and can act on the top end of the rack (43).
7. A multi-resonance piezoelectric energy harvester with frequency up-conversion according to claim 2 or 5, characterized in that the first spring (42) is an extension spring, which is arranged between the top end of the sliding groove (41) and the top end of the rack (43), and the second spring (3) is a compression spring.
8. The multi-resonance piezoelectric energy collector with frequency up-conversion function according to claim 1, wherein the number of the gears (44) is two, and the gears are respectively arranged on two sides of the shifting sheet (45), each gear (44) is respectively meshed with one rack (43), each rack (43) is respectively arranged in two sliding chutes (41) which are arranged in parallel, and a first spring (42) is arranged between each rack (43) and each sliding chute (41).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911244791.1A CN110943645A (en) | 2019-12-06 | 2019-12-06 | Multi-resonance piezoelectric energy collector with frequency-up conversion function |
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| CN201911244791.1A CN110943645A (en) | 2019-12-06 | 2019-12-06 | Multi-resonance piezoelectric energy collector with frequency-up conversion function |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854926A (en) * | 2020-07-24 | 2020-10-30 | 镇江联芯微电子科技有限公司 | Clamping type cantilever beam structure vibration energy test platform |
| CN112228298A (en) * | 2020-11-06 | 2021-01-15 | 安徽盛瑞科技有限公司 | Vehicle-mounted positioning device based on self-power generation function |
| CN112636632A (en) * | 2020-12-21 | 2021-04-09 | 上海工程技术大学 | Nonlinear two-degree-of-freedom multi-resonance piezoelectric energy collector |
| CN114039510A (en) * | 2021-11-02 | 2022-02-11 | 上海交通大学 | Multi-direction wide-frequency piezoelectric energy collecting device |
| CN115276465A (en) * | 2022-07-11 | 2022-11-01 | 西安理工大学 | Human motion energy capture device |
-
2019
- 2019-12-06 CN CN201911244791.1A patent/CN110943645A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854926A (en) * | 2020-07-24 | 2020-10-30 | 镇江联芯微电子科技有限公司 | Clamping type cantilever beam structure vibration energy test platform |
| CN112228298A (en) * | 2020-11-06 | 2021-01-15 | 安徽盛瑞科技有限公司 | Vehicle-mounted positioning device based on self-power generation function |
| CN112636632A (en) * | 2020-12-21 | 2021-04-09 | 上海工程技术大学 | Nonlinear two-degree-of-freedom multi-resonance piezoelectric energy collector |
| CN112636632B (en) * | 2020-12-21 | 2024-05-31 | 上海工程技术大学 | Nonlinear two-degree-of-freedom multi-resonance piezoelectric energy collector |
| CN114039510A (en) * | 2021-11-02 | 2022-02-11 | 上海交通大学 | Multi-direction wide-frequency piezoelectric energy collecting device |
| CN114039510B (en) * | 2021-11-02 | 2024-02-06 | 上海交通大学 | Multi-directional broadband piezoelectric energy collection device |
| CN115276465A (en) * | 2022-07-11 | 2022-11-01 | 西安理工大学 | Human motion energy capture device |
| CN115276465B (en) * | 2022-07-11 | 2024-05-10 | 西安理工大学 | Human motion energy capture device |
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