CN105471319B - A kind of air-flow cause sound piezo-electric generating forced vibration device - Google Patents

A kind of air-flow cause sound piezo-electric generating forced vibration device Download PDF

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Publication number
CN105471319B
CN105471319B CN201511016104.2A CN201511016104A CN105471319B CN 105471319 B CN105471319 B CN 105471319B CN 201511016104 A CN201511016104 A CN 201511016104A CN 105471319 B CN105471319 B CN 105471319B
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CN
China
Prior art keywords
sound
air
sound pipe
piezo
nozzle
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CN201511016104.2A
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Chinese (zh)
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CN105471319A (en
Inventor
陈荷娟
蔡建余
邹华杰
孙加存
梁医
杨坚
李飞
张营
张健
孙剑韬
姜节波
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南京理工大学
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02NELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00Electric machines in general using piezo-electric effect, electrostriction or magnetostriction
    • H02N2/18Electric machines in general using piezo-electric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
    • H02N2/185Electric machines in general using piezo-electric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using fluid streams

Abstract

The present invention provides a kind of air-flow cause sound piezo-electric generating forced vibration device, including air inlet, nozzle, the sound pipe vibrational structure for constituting, the PZT (piezoelectric transducer) that is fixed on sound pipe bottom.Wherein, one end of shell forms air inlet with blocking, and nozzle bore is that variable cross-section shrinks air flue;Other end order is arranged with sound pipe, piezoelectric patches, is connected by outer end cover plate and shell, and piezoelectric patches is pressed on into sound pipe end;Cavity is left between nozzle and sound pipe.The present invention flows through air-flow is produced after pipeline variation characteristic and sound wave and the characteristic for causing structural vibration is propagated in cavity, pore using air-flow, a kind of air-flow there is provided new non-activity part causes sound intensity piezo-electric generating forced vibration device, and the forced vibration mechanical system of fluid dynamic sound source is excited with mechanical automodulation air-flow;Meet the self-powered demand of application system in the various fields such as automobile, automatic driving vehicle, weapon application system, space flight and aviation system, robot, city or cell illumination, the regenerative resource of cleaning is improved, with important theory value and Engineering Guidance meaning.

Description

A kind of air-flow cause sound piezo-electric generating forced vibration device

Technical field

The present invention provides a kind of air-flow cause sound piezo-electric generating forced vibration device, relates to the use of the fluid that air-flow induces sound wave Power sound source, excitation PZT (piezoelectric transducer) export the device of electric energy, belong to air-flow piezoelectricity technical field of power generation.

Background technology

Vibration piezoelectric generator of the vibration source from environment apoplexy, air-flow, is a kind of renewable sources of energy of cleaning.Excitation comes from work Make the natural wind in environment(Or the air-flow that head-on air is produced)Electric power system, its wind speed is low, 1~10m/s of scope, i.e., 1~5 The gentle breeze and wind of level, generator all use trunnion axis or vertical axis turbines formula rotational structure, and turbine is pushed directly on by wind or air-flow The magneto-electric transducer that blade rotates excitation generates electricity.For the self-contained electric system of general device or system, turbogenerator is deposited Fabricating yard is difficult, bulky, complex structure, movable members low intensity, the noise such as impeller, turbine are big, and magnetoelectricity transducing is easy The problems such as causing electromagnetic pollution.

At present, using the PZT (piezoelectric transducer) generator of ambient windstream, usually beam type mechanical excitation structure and multilayer PZT (piezoelectric transducer), energy is low, product percent of pass is low to there are problems that output.

Chinese invention patent " a kind of breeze generating set based on piezo-electric effect "(The patent No.:CN201210277507.2, Nanjing Aero-Space University Zhou Chengfeng etc.), disclose a kind of breeze generating set based on piezo-electric effect, including base plate and set The piezoelectricity a period of time on base plate and lift-type blower fan are put, toothed cam, piezoelectricity battle array are connected with the rotating shaft of lift-type blower fan Son is distributed on the outside of cam, and the tooth top of cam is pinnacle, and the number of teeth of cam is N, and the number in piezoelectricity a period of time is M, minimum speed per hour 4 Worked in the gentle breeze environment of kilometer, power output reaches 15mW.The invention is shaken using blower fan and cam tooth the excitation piezoelectricity of rotation Son, system strength is low, and antijamming capability is low, and complex structure, volume are bigger than normal.

United States Patent (USP) " Forced vibration piezo generator and piezo actuator Sapir " (the patent No.:US 8040022, Sapir;Itzhak Irvine, CA), disclose a kind of using one or more cantilever beams The air-flow of formula piezoelectric-array causes the piezoelectric generator that shakes, and piezoelectric power generation system includes multiple piezo-electric generator modules, each piezoelectricity hair Motor module includes multiple piezoelectric cantilevers and fluid pressure regulator, and fluid pressure regulator is arranged on each cantilever beam, There are flow check piston and steam vent.The invention adjusts air-flow and cantilever piezoelectric array by the piston mechanism of linear motion, Similarly there are low system strength, poor anti-interference, complex structure, bulky problem.

The content of the invention

The present invention provides a kind of air-flow cause sound piezo-electric generating forced vibration device, with air-flow modulability is good, vibration frequency The characteristics of stabilization, small volume, simple structure.

A kind of air-flow cause sound piezo-electric generating forced vibration device of the present invention, it is characterised in that:Including air inlet, spray Mouth, the vibrational structure of sound pipe composition, the PZT (piezoelectric transducer) for being fixed on sound pipe bottom.Wherein, one end of shell and blocking formed into Gas port, nozzle bore is that variable cross-section shrinks air flue;Other end order is arranged with sound pipe, piezoelectric patches, by outer end cover plate and shell It is connected, and piezoelectric patches is pressed on sound pipe end;Cavity is left between nozzle and sound pipe.

A kind of described air-flow cause sound piezo-electric generating forced vibration device, it is characterised in that:Described blocking is oblate post Body structure, is embedded in the narrow shape sideshake formed in shell and constitutes air inlet.

A kind of described air-flow cause sound piezo-electric generating forced vibration device, it is characterised in that:Described nozzle bore runner Curve is Wei Duoxinsi base curves.

A kind of described air-flow cause sound piezo-electric generating forced vibration device, it is characterised in that:Nozzle is coaxial with sound pipe, passes through Blocking is pressed on shell;The contraction mouth of nozzle is placed in cavity, positioned at sound pipe front port front end, constitutes a sound wave positive feedback System.

A kind of described air-flow cause sound piezo-electric generating forced vibration device, it is characterised in that:Described sound pipe is with sound The abrupt-change cross section pipe at wavelength-division interface, the endoporus of different-diameter constitutes shrinkage hole, is pressed by cover plate.

A kind of described air-flow cause sound piezo-electric generating forced vibration device, it is characterised in that:Described sound pipe front port has Interior chamfering constitutes cusped edge, is directed at the contraction mouth of nozzle;Place piezoelectric patches and constitute intrinsic frequency equal to sound wave frequently in sound pipe end outside The PZT (piezoelectric transducer) of rate.

A kind of described air-flow cause sound piezo-electric generating forced vibration device, it is characterised in that:Described piezoelectric patches is by piezoelectricity PZT ceramics are made, and are placed in the bottom of sound pipe, are clamped by cover plate, constitute the rigid plane of sound pipe.

A kind of described air-flow cause sound piezo-electric generating forced vibration device, it is characterised in that:Described shell is in cavity position Put it is circumferential be provided with several vertical axises or inclined steam vent, front end with block, rear end be threadedly coupled with cover plate, interlude and spray Mouth, sound pipe gap coordinate.

The present invention is flowed by unstable the becoming a mandarin outside device in an air inlet for special construction, at the nearly mouth of pipe It is turbulent flow that rapid turn is twisted so that can form spray in a contracting nozzle, induces vortex and obscission, is produced periodically " Karman vortex street " pressure field, edge tones is generated in an abrupt-change cross section sound pipe oral area with cusped edge, and the sound wave reflected through sound pipe exists Contracting nozzle is coupled with " vortex street ", and the phenomenon that vortex shedding frequencies are captured by reflection sound wave frequency occurs, and the sound wave sound intensity is put It is big and quickly in sound pipe synthesizing stable standing wave, PZT (piezoelectric transducer) and standing wave resonance.Before sound wave reaches PZT (piezoelectric transducer) Frequency of source is exaggerated, more vibrations can be produced within the identical time, PZT (piezoelectric transducer) is obtained electric energy higher and receive Collection efficiency, is conducive to improving the power output of piezoelectric generator, there is provided the electric energy of tens to hundreds of milliwatts.

The positive effect of the present invention is:

The present invention flows through air-flow is produced after pipeline variation characteristic and sound wave and is propagated in cavity, pore and caused using air-flow The characteristic of structural vibration, there is provided a kind of air-flow of new non-activity part causes sound intensity piezo-electric generating forced vibration device, The forced vibration mechanical system of fluid dynamic sound source is excited with mechanical automodulation air-flow;Meet automobile, automatic driving vehicle, The self-powered need of application system in the various fields such as weapon application system, space flight and aviation system, robot, city or cell illumination Ask, the regenerative resource of cleaning is improved, with important theory value and Engineering Guidance meaning.

Brief description of the drawings:

Fig. 1 is overall structure schematic diagram of the present invention;

Fig. 2 is air current flow schematic diagram of the present invention;

Fig. 3 is blockage structure schematic diagram of the present invention;

Fig. 4 is sound pipe structure principle chart of the present invention;

Fig. 5 is nozzle arrangements schematic diagram of the present invention;

Fig. 6 is the inflow velocity vi and sound pipe bottom sound-pressure frequency f Pi curves that invention blowing test is obtained;

Fig. 7 is pressure testing electric transducer output voltage V0 curves of the present invention;

The FFT curves of Fig. 8 pressure testing electric transducer output voltage V0 curves of the present invention;

Fig. 9 be the inflow velocity vi that obtains of invented generator model machine blowing test with PZT (piezoelectric transducer) output voltage frequently Rate fV0 curves;

In figure, 1, block;2nd, nozzle;3rd, shell;4th, sound pipe;5th, PZT (piezoelectric transducer);6th, outer end cover plate;7th, exhaust outlet;D、 Air inlet;E, cavity;H、;Q1, outer gas stream;Q2, turbulent flow;F, contraction mouth;G, cusped edge.

Specific embodiment

The following examples can make those skilled in the art that the present invention is more fully understood, but limit never in any form The present invention.

Embodiment 1

According to Fig. 1~Fig. 5, apparatus of the present invention vibration knot mainly by being constituted including air inlet D, nozzle 2, sound pipe 4 Structure, the PZT (piezoelectric transducer) 5 for being fixed on the bottom of sound pipe 4;Wherein, one end of shell 3 forms air inlet D, the endoporus of nozzle 2 with blocking 1 It is Wei Duoxinsi based structures;Other end order is arranged with sound pipe 4, piezoelectric patches 5, is connected by outer end cover plate 6 and shell 3, and will Piezoelectric patches 5 is pressed on the end of sound pipe 4;Cavity E is left between nozzle 2 and sound pipe 4.

As shown in figure 3, described air inlet D is shell 3 and the narrow shape sideshake for blocking 1 formation, it is external screw thread knot to block 1 Structure, two symmetrical planes are milled into structure at 1/2 radius in cylinder basic body.

As shown in figure 5, described nozzle 2 is variable cross-section shrinking air flue, inner flow passage curve is Wei Duoxinsi base curves;Spray Mouth 2 is coaxial with sound pipe 4, is pressed on shell 3 by blocking 1;The contraction mouth F of nozzle 2 is placed in cavity E, positioned at the front end of sound pipe 4 Mouth constitutes a sound wave positive feedback system apart from H.

As shown in figure 4, described sound pipe 4 is the abrupt-change cross section pipe with sound wave interface O-O, endoporus is major diameter D2 holes The shrinkage hole constituted with minor diameter D3 holes, is pressed by cover plate 6;The front port of sound pipe 4 has interior chamfering to constitute cusped edge G, is directed at nozzle 2 Contraction mouth F;Place piezoelectric patches 5 and constitute the PZT (piezoelectric transducer) that intrinsic frequency is equal to frequency of sound wave in the end of sound pipe 4 outside.

Described piezoelectric patches 5 is made up of piezoelectricity PZT ceramics, is placed in the bottom of sound pipe 4, is clamped by cover plate 6, constitutes sound pipe 4 Rigid plane M-M.

Described shell 3 is circumferentially provided with 8 vertical axises or inclined steam vent 7 in cavity E positions, front end with block 1, Rear end is threadedly coupled with cover plate 6, and interlude coordinates with nozzle 2, the gap of sound pipe 4.

As shown in Fig. 2 outer gas stream Q1 is generally laminar flow, it is turbulent flow Q2 to turn rapidly to twist by air inlet D, by nozzle 2 Contraction mouth F forms spray in cavity E, is met with air static in chamber when spray is by cavity E, because of height on the border of spray , there is vortex and obscission in speed contact of the stream with quiescent atmosphere, produce " Karman vortex street " pressure field of a cycle change, Propagated to sound pipe 4 in the form of compressional wave, edge tones is generated in the cusped edge G of the front port of sound pipe 4, sound wave is through the diameter in sound pipe 4 D2 holes, diameter D3 holes will be reflected and transmit when reaching interface O-O, and transmitted wave reaches rigid plane M-M and also reflects, and back wave is returned The sound wave of contraction mouth F and " vortex street " coupling amplification sound intensity, the vortex shedding frequencies of " vortex street " are captured simultaneously by reflection sound wave frequency Amplify, finally synthesis standing wave frequency is equal to capture frequency, PZT (piezoelectric transducer) and standing wave resonance in sound pipe 4, and amplitude reaches maximum Value, piezoelectric energy-conversion power output is maximum, produces electric energy maximum.

Fig. 6 is the inflow velocity vi that obtains of the invented generator model machine blowing test of test and sound pipe bottom sound-pressure frequency f Pi curves, data display in figure, f Pi are fluctuated between 2250~2350Hz when vi changes, i.e. 2.3 ± 0.05kHz, and frequency is missed Difference about 50Hz.Fig. 7 pressure testing electric transducer output voltage V0 curves, Fig. 8 is its FFT curve of Fig. 7.Fig. 9 is invented generating The inflow velocity vi that press proof machine blowing test is obtained and PZT (piezoelectric transducer) output voltage frequency fV0 curves, data display in figure, FV0 > f Pi, illustrate that vibration frequency is exaggerated.And, fV0 fluctuates between 6.0~7.5kHz when vi changes, i.e., 6.75 ± 0.75kHz, frequency error about 750Hz.

Claims (8)

1. a kind of air-flow cause sound piezo-electric generating forced vibration device, it is characterised in that:
The vibrational structure that is constituted including air inlet, nozzle, sound pipe, it is fixed on the PZT (piezoelectric transducer) of sound pipe bottom;Wherein, shell One end forms air inlet with blocking, and nozzle bore is that variable cross-section shrinks air flue;Other end order is arranged with sound pipe, piezoelectric patches, leads to Cross outer end cover plate to be connected with shell, and piezoelectric patches is pressed on sound pipe end;Cavity is left between nozzle and sound pipe.
2. a kind of air-flow cause sound piezo-electric generating forced vibration device according to claim 1, it is characterised in that:
Described blocking is oblate column structure, is embedded in the narrow shape sideshake formed in shell and constitutes air inlet.
3. a kind of air-flow cause sound piezo-electric generating forced vibration device according to claim 1, it is characterised in that:
Described nozzle bore passage curve is Wei Duoxinsi base curves.
4. a kind of air-flow cause sound piezo-electric generating forced vibration device according to claim 1, it is characterised in that:
Nozzle is coaxial with sound pipe, is pressed on shell by blocking;The contraction mouth of nozzle is placed in cavity, positioned at sound pipe front port Front end, constitutes a sound wave positive feedback system.
5. a kind of air-flow cause sound piezo-electric generating forced vibration device according to claim 1, it is characterised in that:
Described sound pipe is abrupt-change cross section pipe, and the endoporus of different-diameter is constituted shrinkage hole, pressed by cover plate.
6. a kind of air-flow cause sound piezo-electric generating forced vibration device according to claim 1, it is characterised in that:
Described sound pipe front port has interior chamfering to constitute cusped edge, is directed at the contraction mouth of nozzle;Place piezoelectric patches in sound pipe end outside Constitute the PZT (piezoelectric transducer) that intrinsic frequency is equal to frequency of sound wave.
7. a kind of air-flow cause sound piezo-electric generating forced vibration device according to claim 1, it is characterised in that:
Described piezoelectric patches is made up of piezoelectricity PZT ceramics, is placed in the bottom of sound pipe, is clamped by cover plate, constitutes the rigid walls of sound pipe Face.
8. a kind of air-flow cause sound piezo-electric generating forced vibration device according to claim 1, it is characterised in that:
Described shell is circumferentially provided with several vertical axises or inclined steam vent in cavity E positions, the front end of shell with block, it is outer The rear end of shell is threadedly coupled with cover plate, and interlude coordinates with nozzle, sound pipe gap.
CN201511016104.2A 2015-12-30 2015-12-30 A kind of air-flow cause sound piezo-electric generating forced vibration device CN105471319B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108566117A (en) * 2018-02-08 2018-09-21 中山大学 A kind of differential piezoelectric generating device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102594202A (en) * 2012-03-12 2012-07-18 清华大学 Piezoelectric power generation device based on excitation of fluidic micro oscillator
CN102957340A (en) * 2012-11-04 2013-03-06 温广川 Breeze generator
CN205304645U (en) * 2015-12-30 2016-06-08 南京理工大学 Piezoelectric generator is sent to air current

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4552809B2 (en) * 2005-08-30 2010-09-29 ヤマハ株式会社 Brass instrument playing actuator and brass instrument playing apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102594202A (en) * 2012-03-12 2012-07-18 清华大学 Piezoelectric power generation device based on excitation of fluidic micro oscillator
CN102957340A (en) * 2012-11-04 2013-03-06 温广川 Breeze generator
CN205304645U (en) * 2015-12-30 2016-06-08 南京理工大学 Piezoelectric generator is sent to air current

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108566117A (en) * 2018-02-08 2018-09-21 中山大学 A kind of differential piezoelectric generating device

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