CN205304645U - Piezoelectric generator is sent to air current - Google Patents
Piezoelectric generator is sent to air current Download PDFInfo
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- CN205304645U CN205304645U CN201521125236.4U CN201521125236U CN205304645U CN 205304645 U CN205304645 U CN 205304645U CN 201521125236 U CN201521125236 U CN 201521125236U CN 205304645 U CN205304645 U CN 205304645U
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Abstract
The utility model provides a piezoelectric generator is sent to air current, the vibrating structure that constitutes including air inlet, nozzle, sound duct, fix the piezoelectric transducer in the sound duct bottom. Wherein, the one end of shell forms the air inlet with the jam, and the nozzle hole is variable cross section shrink air flue, other end series arrangement has sound duct, piezoelectric patches, links firmly with the shell through the outer end apron to sticis at the sound duct piezoelectric patches terminal, leave the cavity between nozzle and sound duct. The utility model discloses utilize the air current to flow past change characteristic and the sound wave that the air current produced behind the pipeline and propagates the characteristic that causes structural vibration in cavity, tube hole, the air current that provides a neotype no activity part is sent the sound intensity and is neutralized the electricity pressure vibrating device that generates electricity, has the compulsory vibrating machine system that mechanical automodulation air current excited the fluid dynamic sound source, satisfy the self -powered demand of application system in various fields such as car, remotely piloted vehicle, weapon application system, space flight and aviation system, robot, city or district illumination, improved clear renewable energy, had important theoretical value and the engineering directive significance.
Description
Technical field
This utility model provides a kind of air-flow to cause acoustic pressure electric generator, relates to the use of air-flow and brings out the device of the fluid dynamic sound source of sound wave, excitation piezoelectric transducer output electric energy, belongs to air-flow piezo-electric generating technical field.
Background technology
Vibration source, from the vibration piezoelectric generator of environment apoplexy, air-flow, is the renewable sources of energy of a kind of cleaning. Encourage the electric power system from the natural wind (or air-flow that head-on air produces) in working environment, its wind speed is low, scope 1��10m/s, the i.e. mild wind of 1��5 grade and wind, electromotor all adopts trunnion axis or vertical axis turbines formula rotational structure, pushes directly on turbo blade by wind or air-flow and rotates the magneto-electric transducer generating of excitation. For the self-contained electric system of general device or system, turbogenerator exists that fabricating yard is difficult, bulky, structure is complicated, and the movable members intensity such as impeller, turbine is low, noise big, and magnetoelectricity transducing easily causes the problems such as electromagnetic pollution.
At present, utilize the piezoelectric transducer electromotor of ambient windstream, be usually beam type mechanical excitation structure and multi-layer piezoelectric transducer, there is the output problems such as energy is low, conforming product rate is low.
Chinese utility model patent " a kind of breeze generating set based on the piezoelectric effect " (patent No.: CN201210277507.2, Nanjing Aero-Space University Zhou Chengfeng etc.), disclose a kind of breeze generating set based on piezoelectric effect, including base plate and be arranged on the piezoelectricity a period of time on base plate and lift-type blower fan, the rotating shaft of lift-type blower fan is connected to toothed cam, piezoelectricity a period of time is distributed on the outside of cam, the tooth top of cam is pinnacle, the number of teeth of cam is N, the number in piezoelectricity a period of time is M, the mild wind environment of minimum speed per hour 4 kilometers works, output reaches 15mW. this utility model adopts the blower fan rotated and cam tooth excitation piezoelectric vibrator, and system strength is low, and capacity of resisting disturbance is low, and structure is complicated, volume is bigger than normal.
United States Patent (USP) " the ForcedvibrationpiezogeneratorandpiezoactuatorSapir " (patent No.: US8040022, Sapir; ItzhakIrvine, CA), disclose a kind of air-flow using one or more cantilever piezoelectric array and cause the piezoelectric generator that shakes, piezoelectric power generation system includes multiple piezo-electric generator module, each piezoelectric generator module includes multiple piezoelectric cantilever and fluid pressure regulator, fluid pressure regulator is arranged on each cantilever beam, has flow check piston and steam vent. This utility model relies on the piston mechanism of rectilinear motion to regulate air-flow and cantilever piezoelectric array, similarly there are that system strength is low, poor anti-interference, structure problem complicated, bulky.
Summary of the invention
This utility model provides a kind of air-flow to cause acoustic pressure electric generator, has that air-flow modulability is good, frequency of vibration is stable, volume is little, the feature of simple in construction.
A kind of air-flow described in the utility model causes acoustic pressure electric generator, it is characterised in that: include air inlet, vibrational structure that nozzle, sound pipe are constituted, be fixed on the piezoelectric transducer bottom sound pipe. 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 with shell by outer end cover plate, and piezoelectric patches is pressed on sound pipe end; Cavity is left between nozzle and sound pipe.
Described a kind of air-flow causes acoustic pressure electric generator, it is characterised in that: described blocking is oblate column structure, inlays the narrow shape sideshake formed in the enclosure and constitutes air inlet.
Described a kind of air-flow causes acoustic pressure electric generator, it is characterised in that: described nozzle bore runner shape line is Wei Duoxinsi base curves.
Described a kind of air-flow causes acoustic pressure electric generator, 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, and sound pipe front port distance, constitutes a sound wave positive feedback system.
Described a kind of air-flow causes acoustic pressure electric generator, it is characterised in that: described sound pipe is for having the interfacial abrupt-change cross section pipe of sound wave, and the endoporus of different-diameter constitutes shrinkage hole, is pressed by cover plate.
Described a kind of air-flow causes acoustic pressure electric generator, it is characterised in that: described sound pipe front port has interior chamfering to constitute cusped edge, the contraction mouth of alignment nozzle; Place piezoelectric patches outside sound pipe end and constitute the natural frequency piezoelectric transducer equal to frequency of sound wave.
Described a kind of air-flow causes acoustic pressure electric generator, it is characterised in that: described piezoelectric patches is made up of piezoelectricity PZT pottery, is placed in the bottom of sound pipe, cover plate clamps, and constitutes the rigid plane of sound pipe.
Described a kind of air-flow causes acoustic pressure electric generator, it is characterised in that: described shell has the steam vent of 8 vertical axises or inclination in empty cavity position circumference, threadeds with cover plate with blocking, rear end in front end, interlude and nozzle, sound pipe matched in clearance.
This utility model is become a mandarin by the instability outside device and flows in the air inlet of a special construction, turning rapidly at nearly mouth of pipe place twists as turbulent flow, make to form spray at a contracting nozzle, bring out vortex and obscission, produce periodically " Karman vortex street " pressure field, edge tones is generated at an abrupt-change cross section sound pipe oral area with cusped edge, the sound wave reflected through sound pipe couples with " vortex street " at contracting nozzle, there is the phenomenon that vortex shedding frequencies is captured by reflected sound wave frequency, the sound wave sound intensity is exaggerated and the quickly standing wave of synthesizing stable in sound pipe, piezoelectric transducer and standing wave resonance.It was exaggerated frequency of source before sound wave arrives piezoelectric transducer, more vibration can be produced within the identical time, make piezoelectric transducer obtain higher electricity collection efficiency, be conducive to improving the output of piezoelectric generator, it is provided that the electric energy of tens to hundreds of milliwatt.
Of the present utility model have the active effect thatThis utility model utilize air-flow to flow through pipeline after air-flow produce variation characteristic and sound wave in cavity, pore, propagate the characteristic causing structural vibration, provide a kind of novel air-flow without movable members and cause sound intensity piezo-electric generating forced vibration device, there is mechanical automodulation air-flow and excite the forced vibration mechanical system of fluid dynamic sound source; 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 community illumination, improve the regenerative resource of cleaning, there is important theory value and Engineering Guidance meaning.
Accompanying drawing illustrates:
Fig. 1 is this utility model overall structure schematic diagram;
Fig. 2 is this utility model air current flow schematic diagram;
Fig. 3 is that this utility model blocks 1 structure principle chart;
Fig. 4 is this utility model sound pipe 4 structure principle chart;
Fig. 5 is this utility model nozzle 2 structure principle chart;
Fig. 6 is that sound-pressure frequency fPi curve at the bottom of the inflow velocity vi and sound pipe obtained is tested in utility model blowing;
Fig. 7 is this utility model pressure testing electric transducer output voltage V0 curve;
The FFT curve of Fig. 8 this utility model pressure testing electric transducer output voltage V0 curve;
The inflow velocity vi and piezoelectric transducer output voltage frequency fV0 curve that obtain are tested in the electromotor model machine blowing that Fig. 9 is institute's utility model;
In figure, 1, blocking; 2, nozzle; 3, shell; 4, sound pipe; 5, piezoelectric transducer; 6, outer end cover plate; 7, air vent; D, air inlet; E, cavity; H, front port distance; Q1, outer gas stream; Q2, turbulent flow; F, contraction mouth; G, cusped edge.
Detailed description of the invention
The following examples can make those skilled in the art more fully understand this utility model, but limits this utility model never in any form.
Embodiment 1
According to Fig. 1��Fig. 5, this utility model device mainly by including air inlet D, vibrational structure that nozzle 2, sound pipe 4 are constituted, be fixed on the piezoelectric transducer 5 bottom sound pipe 4; Wherein, one end of shell 3 forms air inlet D with blocking 1, and nozzle 2 endoporus is Wei Duoxinsi based structures; Other end order is arranged with sound pipe 4, piezoelectric patches 5, is connected with shell 3 by outer end cover plate 6, and piezoelectric patches 5 is pressed on sound pipe 4 end; Cavity E is left between nozzle 2 and sound pipe 4.
As it is shown on figure 3, the narrow shape sideshake that described air inlet D is shell 3 and blocking 1 formation, blocking 1 is external thread structure, and on the basic body of cylinder, 1/2 radius place two symmetrical plane is milled into structure.
As it is shown in figure 5, described nozzle 2 shrinks air flue for variable cross-section, inner flow passage shape line is Wei Duoxinsi base curves; Nozzle 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, and sound pipe 4 front port distance H, constitutes a sound wave positive feedback system.
As shown in Figure 4, described sound pipe 4 is the abrupt-change cross section pipe with sound wave separating surface O-O, and endoporus is major diameter D2 hole and the shrinkage hole of minor diameter D3 hole composition, is pressed by cover plate 6; Sound pipe 4 front port has interior chamfering to constitute cusped edge G, the contraction mouth F of alignment nozzle 2;Place piezoelectric patches 5 outside sound pipe 4 end and constitute the natural frequency piezoelectric transducer equal to frequency of sound wave.
Described piezoelectric patches 5 is made up of piezoelectricity PZT pottery, is placed in the bottom of sound pipe 4, cover plate 6 clamp, and constitutes the rigid plane M-M of sound pipe 4.
Described shell 3 has a steam vent 7 of 8 vertical axises or inclination in cavity E position circumference, threadeds with cover plate 6 with blocking 1, rear end in front end, interlude and nozzle 2, sound pipe 4 matched in clearance.
As shown in Figure 2, outer gas stream Q1 mostly is laminar flow, turning rapidly through air inlet D twists as turbulent flow Q2, in cavity E, spray is formed through the contraction mouth F of nozzle 2, air static with intracavity when spray is by cavity E meets, contacting because of high velocity stream and quiescent atmosphere on the border of spray, there is vortex and obscission, produce periodically variable " Karman vortex street " pressure field, propagate to sound pipe 4 with the form of compressional wave, edge tones is generated at the cusped edge G of sound pipe 4 front port, sound wave diameter D2 hole in sound pipe 4, to reflect and transmission when diameter D3 hole arrives separating surface O-O, transmitted wave arrives rigid plane M-M and also reflects, echo reclaims sound wave and " vortex street " coupling amplification sound intensity of reducing F, the vortex shedding frequencies of " vortex street " is captured by reflected sound wave frequency and amplifies, the final standing wave frequency that synthesizes in sound pipe 4 is equal to capture frequency, piezoelectric transducer and standing wave resonance, amplitude reaches maximum, piezoelectric energy-conversion output is maximum, generation electric energy is maximum.
Sound-pressure frequency fPi curve at the bottom of the inflow velocity vi and sound pipe obtained is tested in the electromotor model machine blowing that Fig. 6 is test institute utility model, and in figure, data show, during vi change, fPi fluctuates between 2250��2350Hz, i.e. 2.3 �� 0.05kHz, frequency error is about 50Hz. Fig. 7 pressure testing electric transducer output voltage V0 curve, Fig. 8 is its FFT curve of Fig. 7. The inflow velocity vi and piezoelectric transducer output voltage frequency fV0 curve that obtain are tested in the electromotor model machine blowing that Fig. 9 is institute's utility model, and in figure, data show, fV0 > fPi, illustrate that frequency of vibration is exaggerated. And, during vi change, fV0 fluctuates between 6.0��7.5kHz, i.e. 6.75 �� 0.75kHz, frequency error is about 750Hz.
Claims (8)
1. an air-flow causes acoustic pressure electric generator, it is characterised in that:
Including air inlet, nozzle, sound pipe constitute vibrational structure, be fixed on the piezoelectric transducer bottom sound pipe; 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 with shell by outer end cover plate, and piezoelectric patches is pressed on sound pipe end; Cavity is left between nozzle and sound pipe.
2. a kind of air-flow according to claim 1 causes acoustic pressure electric generator, it is characterised in that:
Described blocking is oblate column structure, inlays the narrow shape sideshake formed in the enclosure and constitutes air inlet.
3. a kind of air-flow according to claim 1 causes acoustic pressure electric generator, it is characterised in that:
Described nozzle bore runner shape line is Wei Duoxinsi base curves.
4. a kind of air-flow according to claim 1 causes acoustic pressure electric generator, 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, and sound pipe front port distance, constitutes a sound wave positive feedback system.
5. a kind of air-flow according to claim 1 causes acoustic pressure electric generator, it is characterised in that:
Described sound pipe is for having the interfacial abrupt-change cross section pipe of sound wave, and the endoporus of different-diameter constitutes shrinkage hole, is pressed by cover plate; Abrupt-change cross section pipe, the endoporus of different-diameter constitutes shrinkage hole, is pressed by cover plate.
6. a kind of air-flow according to claim 1 causes acoustic pressure electric generator, it is characterised in that:
Described sound pipe front port has interior chamfering to constitute cusped edge, the contraction mouth of alignment nozzle;Place piezoelectric patches outside sound pipe end and constitute the natural frequency piezoelectric transducer equal to frequency of sound wave.
7. a kind of air-flow according to claim 1 causes acoustic pressure electric generator, it is characterised in that:
Described piezoelectric patches is made up of piezoelectricity PZT pottery, is placed in the bottom of sound pipe, cover plate clamps, and constitutes the rigid plane of sound pipe.
8. a kind of air-flow according to claim 1 causes acoustic pressure electric generator, it is characterised in that:
Described shell has the steam vent of several vertical axis or inclination in empty cavity position circumference, threadeds with cover plate with blocking, rear end in front end, interlude and nozzle, sound pipe matched in clearance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521125236.4U CN205304645U (en) | 2015-12-30 | 2015-12-30 | Piezoelectric generator is sent to air current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521125236.4U CN205304645U (en) | 2015-12-30 | 2015-12-30 | Piezoelectric generator is sent to air current |
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| CN205304645U true CN205304645U (en) | 2016-06-08 |
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| CN201521125236.4U Withdrawn - After Issue CN205304645U (en) | 2015-12-30 | 2015-12-30 | Piezoelectric generator is sent to air current |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391345A (en) * | 2015-12-30 | 2016-03-09 | 南京理工大学 | Fluid power sound source excitation method of piezoelectric generator |
| CN105471319A (en) * | 2015-12-30 | 2016-04-06 | 南京理工大学 | Airflow-induced acoustic piezoelectric power generation forced vibration device |
| CN106230319A (en) * | 2016-09-14 | 2016-12-14 | 长春工业大学 | Porous incremental type grid type electromotor towards pneumatic system low energy-consumption electronic device energy supply |
| CN108322092A (en) * | 2018-03-12 | 2018-07-24 | 常州机电职业技术学院 | Enhanced air-flow causes acoustic excitation device and enhanced air-flow to cause acoustic excitation method |
| CN108459176A (en) * | 2018-04-12 | 2018-08-28 | 常州机电职业技术学院 | The piezoelectric energy collection structure and self-powered wind speed measuring device, method to be shaken based on charming appearance and behaviour |
| CN111386866A (en) * | 2020-03-26 | 2020-07-10 | 江苏大学 | Static cleaning device for rice threshing mixture grains and combine harvester |
-
2015
- 2015-12-30 CN CN201521125236.4U patent/CN205304645U/en not_active Withdrawn - After Issue
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391345A (en) * | 2015-12-30 | 2016-03-09 | 南京理工大学 | Fluid power sound source excitation method of piezoelectric generator |
| CN105471319A (en) * | 2015-12-30 | 2016-04-06 | 南京理工大学 | Airflow-induced acoustic piezoelectric power generation forced vibration device |
| CN105391345B (en) * | 2015-12-30 | 2017-06-16 | 南京理工大学 | A kind of piezoelectric generator fluid dynamic sound source excitation method |
| CN105471319B (en) * | 2015-12-30 | 2017-06-16 | 南京理工大学 | A kind of air-flow cause sound piezo-electric generating forced vibration device |
| CN106230319A (en) * | 2016-09-14 | 2016-12-14 | 长春工业大学 | Porous incremental type grid type electromotor towards pneumatic system low energy-consumption electronic device energy supply |
| CN106230319B (en) * | 2016-09-14 | 2018-03-30 | 长春工业大学 | Towards the porous flow increasing type grid type generator of pneumatic system low energy-consumption electronic device energy supply |
| CN108322092A (en) * | 2018-03-12 | 2018-07-24 | 常州机电职业技术学院 | Enhanced air-flow causes acoustic excitation device and enhanced air-flow to cause acoustic excitation method |
| CN108322092B (en) * | 2018-03-12 | 2024-02-20 | 常州机电职业技术学院 | Enhanced airflow induced acoustic excitation device and enhanced airflow induced acoustic excitation method |
| CN108459176A (en) * | 2018-04-12 | 2018-08-28 | 常州机电职业技术学院 | The piezoelectric energy collection structure and self-powered wind speed measuring device, method to be shaken based on charming appearance and behaviour |
| CN108459176B (en) * | 2018-04-12 | 2023-11-07 | 常州机电职业技术学院 | Piezoelectric energy collection structure based on wind induced vibration and self-powered wind speed measuring device and method |
| CN111386866A (en) * | 2020-03-26 | 2020-07-10 | 江苏大学 | Static cleaning device for rice threshing mixture grains and combine harvester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160608 Effective date of abandoning: 20170616 |