CN112886864A - C-type turbulence adjustable series-connection fluid energy piezoelectric energy harvester - Google Patents
C-type turbulence adjustable series-connection fluid energy piezoelectric energy harvester Download PDFInfo
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- CN112886864A CN112886864A CN202110149664.4A CN202110149664A CN112886864A CN 112886864 A CN112886864 A CN 112886864A CN 202110149664 A CN202110149664 A CN 202110149664A CN 112886864 A CN112886864 A CN 112886864A
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- 239000012530 fluid Substances 0.000 title claims abstract description 17
- 230000005284 excitation Effects 0.000 claims abstract description 5
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- 239000013013 elastic material Substances 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 4
- 229910000906 Bronze Inorganic materials 0.000 claims description 2
- 239000002033 PVDF binder Substances 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 239000010974 bronze Substances 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000004626 polylactic acid Substances 0.000 claims description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 2
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- 229920000747 poly(lactic acid) Polymers 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 230000000638 stimulation Effects 0.000 description 1
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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 discloses a C-type turbulence adjustable series connection fluid energy piezoelectric energy harvester, which comprises a piezoelectric cantilever beam made of conductive elastic materials and a plurality of piezoelectric patches arranged on one side or two sides of the piezoelectric cantilever beam, wherein the piezoelectric patches are used for generating electric energy in the vibration state of the piezoelectric energy harvester; the piezoelectric cantilever beam is connected in series with a plurality of turbulence columns along the length direction, and the opening directions of the turbulence columns connected in series are the same; the piezoelectric sheets are arranged between two adjacent turbulence columns at intervals; the turbulence columns are of C-shaped structures, the cross sections of the turbulence columns are of open arc structures, the opening directions of the turbulence columns at the end parts of the piezoelectric cantilever beams are opposite to the jet flow direction and are used for generating turbulence under the excitation of jet flow, and the other turbulence columns are used for increasing the fluid-solid coupling effect. The piezoelectric energy harvester is simple in structure and high in recovery efficiency, can realize the recovery of micro energy, and provides a novel energy supply mode for low-power consumption equipment.
Description
Technical Field
The invention belongs to the technical field of flow-induced vibration energy harvesting, and particularly relates to a C-type disturbed flow adjustable series-connected fluid energy piezoelectric energy harvester.
Background
With the rapid development of wireless sensor network technology, MEMS devices are widely used in various industries such as agricultural applications, military reconnaissance, and the like. The MEMS device usually needs an independent micro battery to supply power, and the traditional battery has the defects of short service life, frequent replacement and the like, so that the development of the MEMS device is limited, therefore, the piezoelectric effect is adopted to collect and utilize micro energy in the environment, and a novel energy supply mode is provided for the MEMS, so that the MEMS device draws wide attention.
Wind energy is one of ubiquitous renewable energy sources, and the vibration of the piezoelectric material can be effectively triggered by the motion of the fluid, so that the kinetic energy of the fluid is converted into electric energy, and the energy conversion is realized. At present, the energy consumption of part of MEMS devices is already low to milliwatt or even microwatt level, so that the energy supply of the MEMS devices by utilizing the piezoelectric effect becomes possible, and the piezoelectric type energy recovery device has the advantages of simple structure, high energy conversion efficiency and the like, and has bright application prospect.
At present, the flow-induced vibration type piezoelectric energy harvester gets the attention of a plurality of researchers, the researched energy harvester is mainly suitable for flow fields with larger space, such as natural wind fields, ocean flow fields and the like, jet flows with limited flow field space, such as automobile exhaust, pneumatic system exhaust and the like, exist in the environment, the traditional piezoelectric energy harvester has small response to jet flow excitation, and the flow field is limited and cannot generate complete flow-around phenomenon, so the energy conversion efficiency is low. The conventional piezoelectric energy harvester for jet energy recovery comprises a single cantilever beam type piezoelectric energy harvester and a Y-type piezoelectric energy harvester, wherein the single cantilever beam type piezoelectric energy harvester has smaller vibration amplitude and needs to be kept in a jet central region, and the Y-type piezoelectric energy harvester can generate larger energy loss when jet impacts an irregular turbulent flow column, so that the piezoelectric energy harvester which is suitable for jet energy recovery, large in coupling vibration response and high in energy conversion efficiency is necessary to be researched.
Disclosure of Invention
The invention aims to provide a C-type disturbed flow adjustable series connection fluid energy piezoelectric energy harvester, which aims to improve the coupling vibration response under the jet excitation and solve the problem that the traditional piezoelectric energy harvester cannot be suitable for jet energy recovery.
The technical solution for realizing the purpose of the invention is as follows:
a C-type turbulence adjustable series connection fluid energy piezoelectric energy harvester comprises a piezoelectric cantilever beam made of conductive elastic materials and a plurality of piezoelectric patches arranged on one side or two sides of the piezoelectric cantilever beam, wherein the piezoelectric patches are used for generating electric energy in the vibration state of the piezoelectric energy harvester; the piezoelectric cantilever beam is connected in series with a plurality of turbulence columns along the length direction, and the opening directions of the turbulence columns connected in series are the same; the piezoelectric sheets are arranged between two adjacent turbulence columns at intervals; the turbulence columns are of C-shaped structures, the cross sections of the turbulence columns are of open arc structures, the opening directions of the turbulence columns at the end parts of the piezoelectric cantilever beams are opposite to the jet flow direction and are used for generating turbulence under the excitation of jet flow, and the other turbulence columns are used for increasing the fluid-solid coupling effect.
Compared with the prior art, the invention has the following remarkable advantages:
the C-type turbulence adjustable series connection fluid energy piezoelectric energy harvester has the advantages of simple structure and high energy conversion efficiency, can generate larger-amplitude vibration in a jet environment and output higher electric energy compared with the traditional flow-induced vibration type piezoelectric energy harvester, and can generate larger vibration response and reduce energy loss caused by impact compared with a single cantilever beam type piezoelectric energy harvester and a Y-type piezoelectric energy harvester. The series arrangement can increase the coupling vibration of the energy harvester, and the second turbulence column can be adjusted to move transversely, so that the energy harvester is suitable for different working environments.
Drawings
FIG. 1 is a schematic structural diagram of a piezoelectric energy harvester according to the present invention;
FIG. 2 is a front view of a piezoelectric energy harvester of the present invention;
FIG. 3 is a top view of a piezoelectric energy harvester of the present invention;
FIG. 4 is a schematic diagram of a first spoiler column of the piezoelectric energy harvester of the present invention
FIG. 5 is a schematic view of a second spoiler column of the piezoelectric energy harvester of the present invention;
fig. 6 is a schematic diagram of a piezoelectric cantilever of the piezoelectric energy harvester of the present invention.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
The embodiment provides a specific implementation scheme of a C-type disturbed flow adjustable series connection fluid energy piezoelectric energy harvester. As shown in fig. 1 to 3, the piezoelectric energy harvester includes a first turbulent flow column 1, a piezoelectric sheet 2, a second turbulent flow column 3, a piezoelectric sheet 4 and a piezoelectric cantilever 6. A plurality of through holes are arranged at different positions in the length direction of the piezoelectric cantilever beam 6, the first current disturbing column 1 and the second current disturbing column 3 are fixed on the piezoelectric cantilever beam 6 through adjusting devices such as bolts and nuts, piezoelectric sheets are arranged on the upper surface or/and the lower surface of the piezoelectric cantilever beam and can be fixed by adopting conductive adhesive in a bonding mode.
More specifically, the piezoelectric energy harvester designed by the invention is introduced by taking two turbulence columns connected in series as an example, the number of the turbulence columns includes but is not limited to two, and different numbers of the turbulence columns can be connected in series according to different working environments.
More specifically, the opening direction of the first turbulence column 1 of the piezoelectric energy harvester is opposite to the jet flow direction, the opening directions of the turbulence columns connected in series are the same, and the other end of the piezoelectric cantilever beam 6 is fixed. The first turbulence column 1 and the second turbulence column 3 are both C-shaped structures, the cross sections of the first turbulence column and the second turbulence column are of open arc structures, and bosses at the tail ends of the turbulence columns are used for fixing and connecting. As shown in fig. 4, the tail end of the first turbulence column 1 is provided with a groove, and the piezoelectric cantilever 6 can be embedded. As shown in fig. 5, a through groove is arranged in the middle of the second turbulent flow column 3, and the through groove can be sleeved on the piezoelectric cantilever 6 and can slide relative to the piezoelectric cantilever 6. The key factor of the size of the turbulence column is the diameter of an arc, and different turbulence columns can be processed and manufactured according to different working environments.
More specifically, according to the piezoelectric energy harvester designed by the invention, the first turbulence column 1 is fixed on the piezoelectric cantilever beam 6 through a bolt and a nut, the second turbulence column 3 can transversely move on the piezoelectric cantilever beam 6, through holes are arranged at different positions on the piezoelectric cantilever beam 6, and the second turbulence column 3 can be fixed at different positions through the bolt and the nut, so that the piezoelectric energy harvester can be adjusted in different working environments to obtain higher output performance. To facilitate understanding of embodiments of the present invention, the second turbulence column 3 in the disclosed embodiments of the present invention can be fixed in 3 different positions.
More specifically, the piezoelectric energy harvester designed by the invention is characterized in that piezoelectric sheets are arranged on the upper surface or/and the lower surface of the piezoelectric cantilever beam 6 and are bonded and fixed through conductive adhesive, the piezoelectric energy harvester generates vibration under the impact of jet flow, and charges are accumulated on the surfaces of the piezoelectric sheets to generate electric energy due to the positive piezoelectric effect.
More specifically, according to the piezoelectric energy harvester designed by the invention, under jet stimulation, the first turbulence column 1 vibrates due to aeroelasticity instability, and meanwhile, a flow bypassing phenomenon is generated when jet flow bypasses the first turbulence column 1, so that the vibration amplitude is increased, in addition, the jet flow passing through the first turbulence column 1 can continuously act on the second turbulence column 2, the fluid-solid coupling effect is increased, the energy harvesting energy is improved, and the energy conversion efficiency is improved.
The piezoelectric cantilever 6 can be made of conductive elastic materials to increase the amplitude, and the piezoelectric sheets 2 and 4 can be made of piezoelectric materials with lower internal resistance. More specifically, in the piezoelectric energy harvester designed by the invention, the first turbulence column 1 and the second turbulence column 3 can be made of polylactic acid (PLA) materials through 3D printing, the piezoelectric cantilever beam 6 can be made of phosphor bronze, and the piezoelectric patch can be made of PZT piezoelectric ceramics or PVDF piezoelectric films.
In conclusion, the adjustable piezoelectric energy harvester with the C-shaped series arrangement designed by the invention can solve the problem that the traditional flow-induced vibration type piezoelectric energy harvester cannot normally work in a jet environment, and the energy conversion efficiency is improved. In addition, the piezoelectric energy harvester of the invention connects the turbulence columns in series, increases the coupling vibration response, greatly improves the vibration amplitude of the piezoelectric energy harvester, thereby improving the output voltage, and the second turbulence column can be adjusted, thereby being suitable for different working environments and being used for energy recovery and utilization of jet-type airflow in environments and industries, such as automobile exhaust, pneumatic exhaust and the like, therefore, the piezoelectric energy harvester has wide application prospect in the field of jet energy recovery.
Claims (7)
1. A C-type disturbed flow adjustable series connection fluid energy piezoelectric energy harvester is characterized by comprising a piezoelectric cantilever beam made of conductive elastic materials and a plurality of piezoelectric patches arranged on one side or two sides of the piezoelectric cantilever beam, wherein the piezoelectric patches are used for generating electric energy in the vibration state of the piezoelectric energy harvester; the piezoelectric cantilever beam is connected in series with a plurality of turbulence columns along the length direction, and the opening directions of the turbulence columns connected in series are the same; the piezoelectric sheets are arranged between two adjacent turbulence columns at intervals; the turbulence columns are of C-shaped structures, the cross sections of the turbulence columns are of open arc structures, the opening directions of the turbulence columns at the end parts of the piezoelectric cantilever beams are opposite to the jet flow direction and are used for generating turbulence under the excitation of jet flow, and the other turbulence columns are used for increasing the fluid-solid coupling effect.
2. The C-type spoiler-adjustable series connection fluid energy piezoelectric energy harvester of claim 1, wherein the mounting positions of the remaining spoiler columns are adjustable.
3. The C-shaped disturbed flow adjustable series connection fluid energy piezoelectric energy harvester of claim 1, wherein the disturbed flow column at the end of the piezoelectric cantilever beam has a groove at the tail end for embedding the piezoelectric cantilever beam; and a through groove is formed in the middle of the other turbulence columns and is used for sleeving the piezoelectric cantilever beam and can slide relative to the piezoelectric cantilever beam.
4. The C-type disturbed flow adjustable series connection fluid energy piezoelectric energy harvester of claim 1, wherein the piezoelectric sheet is fixed on the surface of the piezoelectric cantilever beam by conductive glue.
5. The C-type disturbed flow adjustable series connection fluid energy piezoelectric energy harvester of claim 1, wherein the disturbed flow column is made of polylactic acid material.
6. The C-type disturbed flow adjustable series connection fluid energy piezoelectric energy harvester of claim 1, wherein the piezoelectric cantilever beam is made of phosphor bronze.
7. The C-type disturbed flow adjustable series connection fluid energy piezoelectric harvester according to claim 1, wherein the piezoelectric sheet is made of PZT piezoelectric ceramics or PVDF piezoelectric film.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110149664.4A CN112886864A (en) | 2021-02-03 | 2021-02-03 | C-type turbulence adjustable series-connection fluid energy piezoelectric energy harvester |
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| CN202110149664.4A CN112886864A (en) | 2021-02-03 | 2021-02-03 | C-type turbulence adjustable series-connection fluid energy piezoelectric energy harvester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114285323A (en) * | 2021-12-31 | 2022-04-05 | 安徽工程大学 | Vibration energy collector device |
Citations (6)
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|---|---|---|---|---|
| CN105071696A (en) * | 2015-07-24 | 2015-11-18 | 哈尔滨工业大学 | Vertical shaft axial excitation type fluid kinetic energy capturing device |
| CN106301073A (en) * | 2016-09-14 | 2017-01-04 | 长春工业大学 | A kind of double acting diaphragm type piezoelectric generator utilizing annular space jet excitation |
| CN106329990A (en) * | 2016-09-14 | 2017-01-11 | 长春工业大学 | Vortex street oscillation piezoelectric energy harvesting device adopting double-layer flow-increasing excitation |
| CN109274289A (en) * | 2018-12-07 | 2019-01-25 | 中国计量大学 | A kind of piezoelectric energy trapping device and method that can automatically adjust resonant frequency and bandwidth |
| CN110176874A (en) * | 2019-06-05 | 2019-08-27 | 哈尔滨工业大学 | A kind of flutter of aerofoil is coupled with vortex-induced vibration and tunable piezoelectric harvester |
| CN110429864A (en) * | 2019-08-13 | 2019-11-08 | 哈尔滨工业大学 | A kind of compound piezoelectric harvester of bending increasing prisoner's energy ability |
-
2021
- 2021-02-03 CN CN202110149664.4A patent/CN112886864A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071696A (en) * | 2015-07-24 | 2015-11-18 | 哈尔滨工业大学 | Vertical shaft axial excitation type fluid kinetic energy capturing device |
| CN106301073A (en) * | 2016-09-14 | 2017-01-04 | 长春工业大学 | A kind of double acting diaphragm type piezoelectric generator utilizing annular space jet excitation |
| CN106329990A (en) * | 2016-09-14 | 2017-01-11 | 长春工业大学 | Vortex street oscillation piezoelectric energy harvesting device adopting double-layer flow-increasing excitation |
| CN109274289A (en) * | 2018-12-07 | 2019-01-25 | 中国计量大学 | A kind of piezoelectric energy trapping device and method that can automatically adjust resonant frequency and bandwidth |
| CN110176874A (en) * | 2019-06-05 | 2019-08-27 | 哈尔滨工业大学 | A kind of flutter of aerofoil is coupled with vortex-induced vibration and tunable piezoelectric harvester |
| CN110429864A (en) * | 2019-08-13 | 2019-11-08 | 哈尔滨工业大学 | A kind of compound piezoelectric harvester of bending increasing prisoner's energy ability |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114285323A (en) * | 2021-12-31 | 2022-04-05 | 安徽工程大学 | Vibration energy collector device |
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