CN104113232B - A kind of wind-induced vibration formula piezoelectric generator - Google Patents
A kind of wind-induced vibration formula piezoelectric generator Download PDFInfo
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- CN104113232B CN104113232B CN201410329696.2A CN201410329696A CN104113232B CN 104113232 B CN104113232 B CN 104113232B CN 201410329696 A CN201410329696 A CN 201410329696A CN 104113232 B CN104113232 B CN 104113232B
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Abstract
The invention belongs to regenerative resource and technical field of power generation, particularly relate to a kind of wind-induced vibration formula piezoelectric generator, be applicable to microsensor, microactrator, miniature signal processor and transmitter etc. and need capture the low power dissipation electron equipment that can carry out energy supplement from external environment; This generator is made up of three piezoelectric cantilevers, mass, bluff body, permanent magnet, clamping plate, support and bridge rectifiers; The present invention utilizes principle and the piezo-electric effect of charming appearance and behaviour bluff body galloping, wind energy is converted to electric energy, the electric energy of changing is stored in energy-storage travelling wave tube after by bridge rectifier, the present invention can be transferred to inner beam by the coupling between inner beam and outer beam by outer vibration of beam, not only can prevent the rupture failure that outer beam occurs due to large deformation, and can improve the output voltage of inner beam; The present invention is simple in structure, cost is low, power density is high, is applicable to the auxiliary power supply of wireless senser and low energy-consumption electronic device.
Description
Technical field
Invention belongs to regenerative resource and technical field of power generation, particularly relate to a kind of wind-induced vibration formula piezoelectric generator, be applicable to microsensor, microactrator, miniature signal processor and transmitter etc. and need capture the low power dissipation electron equipment that can carry out energy supplement from external environment.
Background technology
At present, the low energy-consumption electronic device such as all kinds of microsensors, miniature actuator, miniature signal processor and transmitter continues to bring out. When after device microminaturization, the size of energy device has just determined the size of whole system. Do not have the energy device of microminaturization that lasting energy is provided, microminiature device will be difficult to bring into play the advantage of its microminaturization, even loses the original meaning of its microminaturization. If can produce efficient micro-limited battery power of energy substitution life-span, many difficult problems that microminiature device enters in practical process so just can solve. The environmental energy collection technique proposing in recent years provides an effective way for the energy problem that solves microminiature device.
The micro-structural vibration that piezoelectric generator based on wind-induced vibration principle utilizes wind load to cause, is converted to vibrational energy by the wind energy of device place environment, and vibrational energy is converted to electric energy by recycling piezo-electric effect, realizes the power supply to microminiature device. At present, the piezoelectric generator of collecting wind energy adopts linear vibrating structure, and output voltage is low, power density is little, energy collection efficiency is low. The typical piezoelectric generator of collecting wind energy is as YaowenYang, LiyaZhao, LihuaTang writes articles " Comparativestudyoftipcross-sectionsforefficientgalloping energyharvesting " (" realizing the comparative study of the bluff body cross section that galloping can efficiently collect " " Applied Physics wall bulletin ") at " AppliedPhysicsLetters " 102 (2013): 064105. This article comparative study the varying cross-section shape and size of the bluff body relations that affect on wind energy collecting efficiency.
A.Abdelkefi, M.R.Hajj, A.H.Nayfeh writes articles " Powerharvestingfromtransversegallopingofsquarecylinder " (" collection of square body galloping energy " " nonlinear kinetics ") at " NonlinearDynamics " 70 (2012): 1355-1363. This article has been reported a kind of piezoelectric generator of the collection of the galloping by square body wind energy. This generator adopts linear vibrating structure, and does not utilize the Karman vortex street in wake flow, thus output voltage and power less.
Summary of the invention
The object of the invention is to overcome existing wind-induced vibration formula piezoelectric generator complex structure, Voltage-output is low, power density is low problem.
For this reason, the invention provides a kind of wind-induced vibration formula piezoelectric generator, comprise support, piezoelectric cantilever, mass, bluff body, permanent magnet; Described piezoelectric cantilever comprises Inner beam and Wai Liang, and one end of described outer beam is fixedly connected with support, and the other end is fixedly connected with bluff body, and one end of described Inner beam is fixedly connected with support, and the other end is fixedly connected with mass; Described permanent magnet has two at least, and one is arranged on mass, and one is arranged on bluff body; On described piezoelectric cantilever, be provided with piezoelectric element.
Above-mentioned piezoelectric cantilever also comprises rectangular beams of metal, and described piezoelectric element is pasted on respectively the upper and lower surface of beams of metal by conducting resinl; Described piezoelectric element polarizes along piezoelectric cantilever thickness direction.
One end of above-mentioned piezoelectric cantilever is provided with through hole, is fixedly connected with support by bolt, and the other end is free end, is provided with draw-in groove; The free end of Inner beam is fixedly connected with mass by bolt, and the free end of outer beam is fixedly connected with bluff body by bolt. Described support), be provided with through hole on piezoelectric cantilever, mass, bluff body, for all parts is bolted to connection.
Above-mentioned Inner beam and outer beam at least respectively have 1.
Above-mentioned Inner beam has 1; Outer beam has 2, and Inner beam is arranged in the middle of 2 outer beams, and 2 outer beams are in the width symmetry of Inner beam, and Inner beam and Wai Liang be arranged in parallel.
Above-mentioned mass is made up of the first quality sheet and the second quality sheet, and inner beam is clipped in the middle; Described mass is fixedly connected with inner beam by bolt; The middle part of the medial surface of described the first quality sheet and the second quality sheet clamping Inner beam is provided with the first cavity, and the first cavity of the first quality sheet and the second quality sheet coordinates, for embedding permanent magnet.
The one side that above-mentioned bluff body is provided with through hole is also provided with the second cavity for settling permanent magnet, and the set positions of the second cavity coordinates with the first cavity on gauge block.
Above-mentioned two blocks of permanent magnets are that homopolarity is relative, and one is embedded on mass, and one is embedded on bluff body, make Inner beam and outer beam form nonlinearizer at direction of vibration.
Above-mentioned wind-induced vibration formula piezoelectric generator, also comprises clamping plate, and described clamping plate are for clamping one end that Inner beam is connected with support with outer beam.
Above-mentioned wind-induced vibration formula piezoelectric generator, also comprises bridge rectifier and energy-storage travelling wave tube, and described bridge rectifier is electrically connected with Inner beam and outer beam respectively, for converting the electric energy of Inner beam and the generation of outer beam to direct current energy, and is stored in energy-storage travelling wave tube.
The operation principle of this wind-induced vibration formula piezoelectric generator is: the wind of wind-induced vibration formula piezoelectric generator place environment carries and acts on bluff body, causes bluff body generation galloping, and bluff body drives outer beam to vibrate together, and outer beam is output voltage under vibrational excitation; Wind carries and acts on bluff body, forms Karman vortex street in wake flow, and Karman vortex street acts on inner beam, causes interior beam vibration, and inner beam is output voltage under vibrational excitation; Outer beam and inner beam produce Non-Linear Vibration under magnetic coupling interaction, have improved the output voltage of piezoelectric generator; Outer beam is transferred to inner beam by magnetic coupling by portion of energy, not only can improve the output voltage of inner beam, and can prevent the rupture failure that outer beam occurs due to large deformation; The collected electric energy of inner beam and outer beam is converted to after direct current by bridge rectifier respectively, is stored in energy-storage travelling wave tube.
Beneficial effect of the present invention: this wind-induced vibration formula piezoelectric generator provided by the invention, has the following advantages compared with the wind-induced vibration formula piezoelectric generator providing with prior art:
1, the present invention adopts outer beam parcel inner beam to form piezoelectric generator, simple in structure, compact, is easy to realize.
2, the present invention utilizes outer beam under wind carries effect, to produce galloping and collects wind energy, utilizes inner beam under the effect of wake flow Karman vortex street, to produce vibration and collects wind energy, has improved energy resource density and the energy collection efficiency of piezoelectric generator.
3, the present invention adopts permanent magnet coupling inner beam and outer beam to form non-linear piezoelectric generator, has improved the output voltage of generator.
4, the present invention can be transferred to inner beam by the coupling between inner beam and outer beam by outer vibration of beam, not only can prevent the rupture failure that outer beam occurs due to large deformation, and can improve the output voltage of inner beam.
Below with reference to accompanying drawing, the present invention is described in further details.
Brief description of the drawings
Fig. 1 is contrive equipment structural representation.
Fig. 2 is bridge rectifier schematic diagram.
Fig. 3 is Inner beam 1 or outer beam 3 structural representations.
Fig. 4 is mass block structure schematic diagram.
Fig. 5 is bluff body structural representation.
Fig. 6 is clamp region schematic diagram.
Fig. 7 is supporting structure schematic diagram.
Fig. 8 is memory capacitance both end voltage in the embodiment of the present invention Changing Pattern with wind speed.
In figure: 1, Inner beam; 2, mass; 2-1, the first quality sheet; 2-2, the second quality sheet; 3, Wai Liang; 4, bluff body 5, clamping plate; 6, support; 7, permanent magnet 8, bridge rectifier; 9, energy-storage travelling wave tube; 10, piezoelectric element; 11, beams of metal.
Detailed description of the invention
Reach for further setting forth the present invention technological means and effect that predetermined object is taked,, be described in detail as follows the specific embodiment of the present invention, architectural feature and effect thereof below in conjunction with drawings and Examples.
Embodiment 1:
In order to solve existing wind-induced vibration formula piezoelectric generator complex structure, Voltage-output is low, power density is low problem, this wind-induced vibration formula piezoelectric generator provided by the invention as shown in Figure 1, comprises support 6, piezoelectric cantilever, mass 2, bluff body 4, permanent magnet 7; Described piezoelectric cantilever comprises Inner beam 1 and outer beam 3, one end of described outer beam 3 is provided with through hole, be bolted to connection with support 6, the other end (free end) is provided with draw-in groove, be bolted to connection with bluff body 4, one end of described Inner beam 1 is provided with through hole, is bolted to connection with support 6, and the other end (free end) is provided with draw-in groove and mass 2 is bolted to connection.
Outer beam 3 is provided with 2 in the present embodiment, Inner beam 1 is provided with 1, Inner beam 1 is arranged in the middle of two outer beams 3, and two outer beams 3 are in the width symmetry of Inner beam 1, and Inner beam 1 and outer beam 3 be arranged in parallel, simultaneously, described permanent magnet 7 has two at least, in the first cavity that is arranged on mass 2, in the second cavity that is arranged on bluff body 4, two blocks of permanent magnets 7 are that homopolarity is relative, and present position can cooperatively interact; Can guarantee that so outer beam 3 vibrates with bluff body, outer beam 3 output voltage under vibrational excitation, wind carries and acts on bluff body 4 simultaneously, in wake flow, form Karman vortex street, Karman vortex street acts on inner beam 1, causes inner beam 1 to vibrate, inner beam 1 also output voltage under vibrational excitation.
As shown in Figure 3, above-mentioned piezoelectric cantilever comprises piezoelectric element 10 and rectangular beams of metal 11, and described piezoelectric element 10 is pasted on respectively the upper and lower surface of beams of metal 11 by conducting resinl; Described piezoelectric element 10 is along the polarization of piezoelectric cantilever thickness direction, and the polarised direction of two piezoelectric units can be identical, and its electrode forms parallel-connection structure; The polarised direction of two piezoelectric units also can be contrary, and its electrode forms cascaded structure; As shown in Figure 2, this wind-induced vibration formula piezoelectric generator also comprises bridge rectifier 8 and energy-storage travelling wave tube 9, and the A portion of described bridge rectifier 8 is electrically connected with outer beam 3, and B portion is electrically connected with inner beam 1, convert direct current energy to for the electric energy that Inner beam 1 and outer beam 3 are produced, and be stored in energy-storage travelling wave tube 9.
As shown in Figure 4, described mass 2 is made up of the first quality sheet 2-1 and the second quality sheet 2-2, and inner beam 1 is clipped in the middle; Described mass 2 is fixedly connected with inner beam 1 by bolt; The middle part of the medial surface of described the first quality sheet 2-1 and the second quality sheet 2-2 clamping Inner beam 1 is provided with the first cavity, and the first cavity of the first quality sheet 2-1 and the second quality sheet 2-2 coordinates, for embedding permanent magnet 7.
Described bluff body 4 is hollow square column body, as shown in Figure 5; The middle part of bluff body 4 is provided with the second cavity, and this second cavity is arranged at a side bluff body 4 relative with mass 2 and is provided with the one side of through hole, for settling the set positions of permanent magnet 7, the second cavitys and coordinating of the first cavity on gauge block 2.
Clamping plate 5 are rectangular sheet beam, as shown in Figure 6. Through hole on clamping plate 5 is consistent with support 6, by bolt, inner beam 1 and outer beam 3 is fixed with support 6; Inner beam 1 and outer beam 3 are sandwiched in corresponding position between clamping plate 5 and support 6, guarantee that bluff body 4 can vibrate with the wind.
Support 6 is a "T"-shaped beam, as shown in Figure 7. On support 6, be provided with through hole, be fixedly connected with outer beam 3 with inner beam 1 by bolt; Support 6 also can not need in addition, according to actual needs miscellaneous part is arranged on to the place of enough these parts of support.
Described two blocks of permanent magnets 7, wherein a permanent magnet 7 is embedded in mass 2, and another piece permanent magnet 7 is embedded in bluff body 4; Two permanent magnet homopolarities are relative, and by epoxy resin respectively with mass 2 and bluff body 4 fixed bondings.
Embodiment 2:
With above-described embodiment difference, be to change to some extent with outer beam 3 and the quantity of Inner beam 1; The quantity of outer beam 3 is not necessarily confined to 2, can be also 1 or 3, is characterized in that outer beam 3 vibrates and output voltage under excited vibration with bluff body 4; It is 1 that same described Inner beam 1 is also not limited to; Being characterized in that wind carries acts on bluff body 4, in wake flow, form Karman vortex street, Karman vortex street acts on inner beam 1, causes inner beam 1 to vibrate, inner beam 1 is output voltage under vibrational excitation, simultaneously mass 2 with quantity permanent magnet 7 also along with the change of Inner beam 1 quantity also changes accordingly.
The present embodiment can, according to concrete application requirements, adopt corresponding size. As following table 1 is listed one group of design parameter of whole piezoelectric generator. The material of the sheet metal beam in inner beam 1 and outer beam 3 is stainless steel, and piezoelectric element is piezoelectric ceramics, and permanent magnet 7 magnetic moments are 0.0057Am2. Make piezoelectric generator according to the parameter of table 1, the generator of experiment test manufacturing is the capacitor charging 30s to 10 μ F under different wind speed, and gained electric capacity both end voltage as shown in Figure 8. The piezoelectric generator that the present invention proposes is compared with corresponding linear piezoelectric generator, and the voltage at memory capacitance two ends is greater than the scope of 4m/s at wind speed, be greatly improved.
One group of design parameter of table 1 piezoelectric generator
Above content is in conjunction with concrete preferred embodiment further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations. For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. a wind-induced vibration formula piezoelectric generator, comprises support (6), piezoelectric cantilever, mass (2), bluff body (4), permanent magnet (7); It is characterized in that: described piezoelectric cantilever comprises Inner beam (1) and outer beam (3), one end of described outer beam (3) is fixedly connected with support (6), the other end is fixedly connected with bluff body (4), one end of described Inner beam (1) is fixedly connected with support (6), and the other end is fixedly connected with mass (2); Described permanent magnet (7) has two at least, and one is arranged on mass (2) above, and one is arranged on bluff body (4); On described piezoelectric cantilever, be provided with piezoelectric element (10);
Described two blocks of permanent magnets (7) are that homopolarity is relative, and one is embedded in mass (2) above, and one is embedded in bluff body (4) above, makes Inner beam (1) and outer beam (3) form nonlinearizer at direction of vibration.
2. wind-induced vibration formula piezoelectric generator as claimed in claim 1, is characterized in that: described piezoelectric cantilever also comprises rectangular beams of metal (11), described piezoelectric element (10) is pasted on respectively the upper and lower surface of beams of metal (11) by conducting resinl; Described piezoelectric element (10) polarizes along piezoelectric cantilever thickness direction.
3. wind-induced vibration formula piezoelectric generator as claimed in claim 1, is characterized in that: one end of described piezoelectric cantilever is provided with through hole, is fixedly connected with support (6) by bolt, and the other end is free end, is provided with draw-in groove; The free end of Inner beam (1) is fixedly connected with mass (2) by bolt, and the free end of outer beam (3) is fixedly connected with bluff body (4) by bolt;
Described support (6), piezoelectric cantilever, mass (2), bluff body are provided with through hole on (4), for all parts is bolted to connection.
4. wind-induced vibration formula piezoelectric generator as claimed in claim 1, is characterized in that: described Inner beam (1) at least respectively has 1 with outer beam (3).
5. wind-induced vibration formula piezoelectric generator as claimed in claim 4, is characterized in that: described Inner beam (1) has 1; Outer beam (3) has 2, and Inner beam (1) is arranged in the middle of 2 outer beams (3), and 2 outer beams (3) are in the width symmetry of Inner beam (1), and Inner beam (1) and outer beam (3) be arranged in parallel.
6. wind-induced vibration formula piezoelectric generator as claimed in claim 1, is characterized in that: described mass (2) is made up of the first quality sheet (2-1) and the second quality sheet (2-2), and inner beam (1) is clipped in the middle; Described mass (2) is fixedly connected with inner beam (1) by bolt; The middle part of the medial surface of described the first quality sheet (2-1) and the second quality sheet (2-2) clamping Inner beam (1) is provided with the first cavity, and the first cavity of the first quality sheet (2-1) and the second quality sheet (2-2) coordinates, for embedding permanent magnet (7).
7. wind-induced vibration formula piezoelectric generator as claimed in claim 1, it is characterized in that: the one side that described bluff body (4) is provided with through hole is also provided with the second cavity for settling permanent magnet (7), and the set positions of the second cavity coordinates with mass (2) upper the first cavity.
8. wind-induced vibration formula piezoelectric generator as claimed in claim 1, is characterized in that: also comprise clamping plate (5), one end that described clamping plate (5) are connected with support (6) with outer beam (3) for clamping Inner beam (1).
9. wind-induced vibration formula piezoelectric generator as claimed in claim 1, it is characterized in that: also comprise bridge rectifier (8) and energy-storage travelling wave tube (9), described bridge rectifier (8) is electrically connected with Inner beam (1) and outer beam (3) respectively, for converting the electric energy of Inner beam (1) and outer beam (3) generation to direct current energy, and be stored in energy-storage travelling wave tube (9).
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| US7839058B1 (en) * | 2007-01-29 | 2010-11-23 | Microstrain, Inc. | Wideband vibration energy harvester |
| CN201854207U (en) * | 2010-10-26 | 2011-06-01 | 温州大学 | Bistable structural piezoelectric energy gathering unit |
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