CN102684552B - Multiple-vibrator series-connection piezoelectric energy harvester - Google Patents
Multiple-vibrator series-connection piezoelectric energy harvester Download PDFInfo
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Abstract
The invention relates to a multiple-vibrator series-connection piezoelectric energy harvester and belongs to the technical field of new energy resources and power generation. A casing is installed on a base through a screw, and 1-50 piezoelectric transducers connected in series are arranged in the casing. Each piezoelectric transducer is formed by riveting two piezoelectric vibrators on a framework through rivets. Each piezoelectric vibrator is formed by bonding a metal substrate and a piezoelectric wafer. The piezoelectric transducers are in clamping connection with a clamp seat, two adjacent piezoelectric transducers are in clamping connection with each other through a clamp pin, the piezoelectric transducers are further in clamping connection with a clamp claw at one end of a pin shaft, and the other end of the pin shaft extends out of the casing and provided with a mass block. A first spring and a second spring are sequentially sleeved on the pin shaft from bottom to top, the first spring is pressed on a transducer casing through a pin shaft shoulder, and the second spring is pressed on the transducer casing through the mass block. A circuit board is installed on the side wall of the transducer casing through a screw. The multiple-vibrator series-connection piezoelectric energy harvester has the advantages of adopting a plurality of series-connected piezoelectric vibrators, being limited by the two springs and capable of achieving recycle of low-frequency high-strength large-power vibrating energy.
Description
Technical field
The invention belongs to new forms of energy and technical field of power generation, be specifically related to a kind of many oscillators tandem piezoelectric harvester, for low frequency, high-intensity oscillation energy regenerating.
Background technology
Research for the microminiature piezoelectric harvester of ambient vibration energy regenerating has become new focus both domestic and external, its objective is: for portable micropower electronic product, remote sensing monitoring system etc. provide real-time energy supply, reduce the not enough or electric energy of battery electric quantity and exhaust the environmental pollution that brought use inconvenience and waste battery cause.Existing achievement in research shows, is only just have higher generating capacity and energy converting between mechanical efficiency when the fundamental frequency of piezoelectric harvester and environmental vibration frequency adapt.But the vibration source frequency in actual environment is usually lower, as induced vibrations only tens or tens hertz usually such as all kinds of vehicles operation and human motions, and amplitude is larger; And the fundamental frequency of piezoelectric vibrator self is usually higher, be generally hundreds of even thousand hertz, low-frequency vibration energy cannot be directly used in and reclaim, can realize reducing frequency even if the lower cantilever beam piezoelectric vibrators of self fundamental frequency also needs to adopt end to install lumped mass block.The mode that cantilever beam piezoelectric vibrators end installs mass additional is applied the most general at present, and its drawback is when lumped mass is larger, and piezoelectric vibrator already produces moderate finite deformation when non operating state, very easily because of environment cross large amplitude, oscillation intensity is too high and damage.For improve piezoelectric vibrator bearing capacity and reliability, realize large amplitude and high-intensity oscillation energy regenerating, circular and the type piezoelectric vibrator of stacking also often is used to structure vibration energy accumulator, but the resonance frequency of this type of piezoelectric vibrator is higher, the resonance frequency of single circular piezoelectric vibrator is a few KHz, and the fundamental frequency of piezoelectric stack is up to tens KHz.In addition, current piezoelectric harvester is made up of single piezoelectric vibrator substantially, because its generating capacity is limited, cannot realize real-time power supply truly, can only adopt energy storage-intermission power supply method work.
Summary of the invention
The invention provides a kind of many oscillators tandem piezoelectric harvester, existing piezoelectric vibratory energy harvester resonance frequency be high, reliability is low to solve, generating capacity and the limited problem of frequency bandwidth.
The technical solution used in the present invention is: housing is arranged on base by screw, and deck to be arranged on base by screw and to be placed in described housing, and 1-50 PZT (piezoelectric transducer) series connection is placed in described housing; Described PZT (piezoelectric transducer) is consisted of rivet two piezoelectric vibrators on ring skeleton; Described piezoelectric vibrator is by metal substrate and piezoelectric chip is bonding forms; PZT (piezoelectric transducer) and the described deck clamping of described first series connection, described two adjacent PZT (piezoelectric transducer)s pass through bayonet lock clamping; The described PZT (piezoelectric transducer) of last series connection and the claw clamping of bearing pin, described bearing pin stretches out outside housing by the through hole of housing upper end, and the screw thread of described bearing pin is provided with mass by nut; Described bearing pin overlaps from bottom to top successively the first spring and the second spring, and described first spring is crimped on transducer housing by the shaft shoulder of bearing pin, described second spring is crimped on transducer housing by mass; Circuit board is arranged on the sidewall of transducer housing by screw, and two piezoelectric vibrators on same PZT (piezoelectric transducer) are connected by wire group one, and two piezoelectric vibrators of different PZT (piezoelectric transducer) are connected by wire group two, then are connected with circuit board by wire group three.
In the present invention, the first spring and the second spring work the spacing and compression position-limiting action that stretches respectively, avoid piezoelectric vibrator because being subject to the excessive damage of distortion, and described second spring also bear the gravity of mass.Described first spring, the second spring and PZT (piezoelectric transducer) are mechanically parallel-connection structure, and its equivalent stiffness is
, the resonance frequency of energy accumulator is
, wherein
with
be respectively the rigidity of the first spring and the second spring,
for the equivalent stiffness after multiple piezoelectric vibrator series connection,
for the rigidity of single piezoelectric vibrator, m is the quality of mass, and n is the quantity of piezoelectric vibrator.According to the computing formula of energy accumulator resonance frequency, the quality of increase mass and piezoelectric vibrator quantity all effectively can reduce the resonance frequency of energy accumulator.
For guaranteeing that piezoelectric vibrator is not under static state subject to External Force Acting and the unlikely damage when mass amplitude is excessive, the computing formula of the quality of mass is
, wherein
,
be respectively energy accumulator static time the first spring and the decrement of the second spring,
for acceleration of gravity; During dynamic duty, the equal and computing formula of the maximum compressible amount of two springs is
, wherein
for the maximum deformation quantity that single piezoelectric vibrator can bear.
In its natural state, piezoelectric vibrator is not by External Force Acting, and now the gravity of quality is born by the second spring.When housing is by ambient vibration excitation, mass drives bearing pin and PZT (piezoelectric transducer) up-down vibration, thus makes piezoelectric vibrator produce flexural deformation, and converts mechanical energy to electric energy.When the actual amplitude of mass is greater than
time, the first spring or the second spring reach maximum decrement, are namely no longer compressed, and the inertia force of mass passes to housing by the first spring or the second spring, thus avoids piezoelectric vibrator to damage because being out of shape excessive.
Feature of the present invention and advantage are:
adopt multiple piezoelectric vibrator to connect and larger mass, system resonance frequencies is lower, generating capacity is strong;
adopt two spring retainer, piezoelectric vibrator can be avoided because being out of shape excessive damage, and reliability is high.
Accompanying drawing explanation
Fig. 1 is configuration diagram when piezoelectric harvester is static in a preferred embodiment of the present invention;
Fig. 2 is the cut-away view of PZT (piezoelectric transducer) in a preferred embodiment of the present invention;
Fig. 3 is the vertical view of Fig. 2;
Fig. 4 is the structural representation of bayonet lock in present pre-ferred embodiments;
Fig. 5 is the A-A cutaway view of Fig. 4;
The voltage-frequency characteristic curve of energy accumulator when Fig. 6 is different lumped mass in a preferred embodiment of the present invention;
Electric energy-the frequency characteristics of energy accumulator when Fig. 7 is different piezoelectric vibrator quantity in a preferred embodiment of the present invention.
embodiment:
Housing 1 is arranged on base 2 by screw, and the base plate 3-1 of deck 3 to be arranged on base 2 by screw and to be placed in described housing 1; The series connection of 1-50 PZT (piezoelectric transducer) 4 is placed in described housing 1, and described PZT (piezoelectric transducer) 4 to be riveted on ring skeleton 4-1 by rivet 4-3 by two ring piezoelectric oscillator 4-2 and to form; Described piezoelectric vibrator 4-2 is by endless metal substrate 4-2-1 and ring piezoelectric wafer 4-2-2 is bonding forms; The PZT (piezoelectric transducer) 4 of described first series connection is by the claw 3-2 clamping of a through hole H on it with described deck 3, and described two adjacent PZT (piezoelectric transducer)s 4 pass through bayonet lock 5 clamping; A through hole H of PZT (piezoelectric transducer) 4 of last described series connection and the claw 6-1 clamping of bearing pin 6, described bearing pin 6 stretches out outside housing 1 by the through hole 1-1 of housing 1 upper end, and the screw thread 6-3 of described bearing pin 6 is provided with mass 10 by nut 9; Described bearing pin 6 overlaps from bottom to top successively the first spring 7 and the second spring 8, and described first spring 7 is crimped on transducer housing 1 by the shaft shoulder 6-2 of bearing pin 6, described second spring 8 is crimped on transducer housing 1 by mass 10; Circuit board 11 is arranged on the sidewall of transducer housing 1 by screw, two piezoelectric vibrator 4-2 on same PZT (piezoelectric transducer) 4 are connected by wire group 1, two piezoelectric vibrator 4-2 of different PZT (piezoelectric transducer) 4 are connected by wire group 2 13, and piezoelectric vibrator 4-2 is connected with circuit board 11 by wire group 3 14 again.
In the present invention, the first spring 7 and the second spring 8 work the spacing and compression position-limiting action that stretches respectively, and avoid piezoelectric vibrator 4-2 because being subject to the excessive damage of distortion, described second spring also bears the gravity of mass 10.Described first spring 7, second spring 8 and PZT (piezoelectric transducer) 4 are mechanically parallel-connection structure, and its equivalent stiffness is
, the resonance frequency of energy accumulator is
, wherein
with
be respectively the rigidity of the first spring 7 and the second spring 8,
for the equivalent stiffness after multiple piezoelectric vibrator 4-2 series connection,
for the rigidity of single piezoelectric vibrator 4-2, m is the quality of mass 10, and n is the quantity of piezoelectric vibrator 4-2.According to the computing formula of energy accumulator resonance frequency, the quality of increase mass and piezoelectric vibrator quantity all effectively can reduce the resonance frequency of energy accumulator.
For guaranteeing that piezoelectric vibrator 4-2 is not under static state subject to External Force Acting and the unlikely damage when mass 10 amplitude is excessive, the computing formula of the quality of mass 10 is
, wherein
,
be respectively energy accumulator static time the first spring 7 and decrement of the second spring 8,
for acceleration of gravity; During dynamic duty, the equal and computing formula of the maximum compressible amount of two springs is
, wherein
for the maximum deformation quantity that single piezoelectric vibrator 4-2 can bear.
In its natural state, piezoelectric vibrator 4-2 is not by External Force Acting, and now the gravity of mass 10 is born by the second spring.When housing is by ambient vibration excitation, mass 10 drives bearing pin 6 and PZT (piezoelectric transducer) 4 up-down vibration, thus makes piezoelectric vibrator 4-2 produce flexural deformation, and converts mechanical energy to electric energy.When the actual amplitude of mass 10 is greater than
time, the first spring 7 or the second spring 8 reach maximum decrement, are namely no longer compressed, and the inertia force of mass 10 passes to housing 1 by the first spring 7 or the second spring 8, thus avoids piezoelectric vibrator 4-2 to damage because being out of shape excessive.
Claims (3)
1. the tandem of oscillator a more than piezoelectric harvester, it is characterized in that: housing is arranged on base by screw, deck is arranged on base by screw, and 1-50 PZT (piezoelectric transducer) series connection is placed in described housing; PZT (piezoelectric transducer) is consisted of rivet two piezoelectric vibrators on skeleton; Piezoelectric vibrator is by metal substrate and piezoelectric chip is bonding forms; PZT (piezoelectric transducer) and the deck clamping of first series connection, two adjacent PZT (piezoelectric transducer)s pass through bayonet lock clamping; The PZT (piezoelectric transducer) of last series connection and the claw clamping of bearing pin one end, bearing pin stretches out outside housing by the through hole on housing, and the other end of bearing pin is provided with mass; Described bearing pin overlaps from bottom to top successively the first spring and the second spring, and described first spring is pressed on transducer housing by the bearing pin shaft shoulder, described second spring is pressed on transducer housing by mass; Circuit board is arranged on transducer housing sidewall by screw, and two piezoelectric vibrators on same PZT (piezoelectric transducer) are connected by wire group one, and two piezoelectric vibrators of different PZT (piezoelectric transducer) are connected by wire group two, then are connected with circuit board by wire group three.
2. one many oscillators tandem piezoelectric harvester according to claim 1, is characterized in that: the resonance frequency of energy accumulator is calculated as follows:
wherein k
1and k
2be respectively the rigidity of the first spring and the second spring, k
pfor the rigidity of single piezoelectric vibrator, m is the quality of mass, and n is the quantity of piezoelectric vibrator.
3. one many oscillators tandem piezoelectric harvester according to claim 2, it is characterized in that: after spring rate is determined, the quality calculation method of mass is:
wherein δ
1, j, δ
2, jbe respectively energy accumulator static time the first spring and the decrement of the second spring, g is acceleration of gravity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109882386A (en) * | 2019-03-01 | 2019-06-14 | 浙江师范大学 | A kind of array-type micro gas compressor |
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| CN106439500B (en) * | 2016-06-15 | 2018-05-01 | 浙江师范大学 | A kind of pipeline stream mode monitoring device |
| CN106197581B (en) * | 2016-06-15 | 2023-03-24 | 浙江师范大学 | Self-powered pipeline flow velocity monitor |
| CN106443054B (en) * | 2016-06-15 | 2020-03-31 | 浙江师范大学 | Pipeline flow velocity monitor |
| CN107395048B (en) * | 2017-08-17 | 2023-06-02 | 浙江师范大学 | Piezoelectric beam energy harvester indirectly excited by combined spring piece |
| CN107359773B (en) * | 2017-08-17 | 2023-03-21 | 浙江师范大学 | Portable energy harvester |
| CN107707152B (en) * | 2017-10-10 | 2024-01-16 | 吉林建筑大学 | Rotary piezoelectric energy harvester |
| GB2572572B (en) * | 2018-04-03 | 2022-03-09 | 8Power Ltd | Energy harvester for harvesting energy from broadband ambient vibrations |
| CN110353432A (en) * | 2019-06-11 | 2019-10-22 | 杭州电子科技大学 | A kind of sitting posture detection seat of piezoelectric type power generation and its power generation, detection method |
| CN112202363B (en) * | 2020-09-29 | 2022-06-17 | 长春工业大学 | Pendulum multi-vibrator series piezoelectric energy harvester |
| CN114050738B (en) * | 2021-11-26 | 2023-06-02 | 浙江师范大学 | Self-powered positioning and tracking system |
| CN115406567B (en) * | 2022-08-04 | 2024-09-17 | 同济大学 | Self-powered stress monitoring system |
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| KR101295670B1 (en) * | 2009-12-11 | 2013-08-14 | 한국전자통신연구원 | piezoelectric power generator |
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|---|---|---|---|---|
| CN101447748A (en) * | 2008-09-12 | 2009-06-03 | 吉林大学 | Piezoelectric self-powersupply low power consumption remote controller |
| WO2010036089A2 (en) * | 2008-09-29 | 2010-04-01 | Mimos Berhad | A device for maximum detection of vibrating energy for harvesting energy |
| CN202617039U (en) * | 2012-06-01 | 2012-12-19 | 浙江师范大学 | Multi-oscillator series type piezoelectric energy accumulator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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Owner name: ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID JILI Effective date: 20141102 |
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Inventor after: Wang Shuyun Inventor after: Shen Yalin Inventor after: Han Junwu Inventor after: Wang Hongyun Inventor after: Cheng Guangming Inventor after: Zeng Ping Inventor after: Chu Lisen Inventor after: Dong Tian Inventor before: Wang Shuyun Inventor before: Han Junwu Inventor before: Wang Hongyun Inventor before: Cheng Guangming Inventor before: Zeng Ping Inventor before: Huang Fangsheng |
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Free format text: CORRECT: INVENTOR; FROM: WANG SHUYUN KAN JUNWU WANG HONGYUN CHENG GUANGMING CENG PING HUANG FANGSHENG TO: WANG SHUYUN SHEN YALIN KAN JUNWU WANG HONGYUN CHENG GUANGMING CENG PING CHU LISEN DONG TIAN |
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Effective date of registration: 20141102 Address after: 321001 Zhejiang province Jinhua City Yingbin Road No. 688 Applicant after: Zhejiang Normal University Applicant after: Electric Power Research Institute, State Grid Jilin Power Co., Ltd. Applicant after: State Grid Corporation of China Address before: 321001 Zhejiang province Jinhua City Yingbin Road No. 688 Applicant before: Zhejiang Normal University |
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