CN102148587A - Combined type piezoelectric generating set - Google Patents
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- CN102148587A CN102148587A CN2010190260864A CN201019026086A CN102148587A CN 102148587 A CN102148587 A CN 102148587A CN 2010190260864 A CN2010190260864 A CN 2010190260864A CN 201019026086 A CN201019026086 A CN 201019026086A CN 102148587 A CN102148587 A CN 102148587A
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Abstract
The invention discloses a combined type piezoelectric generating set. A plurality of cantilever slabs of which the two sides are stuck with a plurality of piezoelectric elements are combined together; one ends of the cantilever slabs are fixed and the other ends are free; moreover, the different cantilever slabs are kept in parallel. As the structural sizes of all the cantilever slabs are different, the bending resonance frequencies of all the cantilever slab are also different. The combined type piezoelectric generating set can convert the mechanical vibration energies of a certain frequency range of an environment into power energies to realize broadband power generating; moreover, as the energies of the plurality of piezoelectric elements are collected, the power generating energies are large and the power generating efficiency is high.
Description
Technical field
The present invention relates to piezoelectric generating device, a kind of such device can convert the vibration mechanical energy of environment to electric energy.
Background technology
Piezoelectric generating device can convert the vibration mechanical energy of surrounding environment or human body to electric energy, is power electronic equipment, makes electronic equipment need not frequently to change battery, or frequent charge, has improved the non-maintaining property of electronic equipment.Its typical case uses and to be included as radio-based electronic devices such as wireless senser or radio sensing network, or the packaged type electronic equipment provides electric energy, all has important use at national defence field and civil area and is worth.
The operation principle of piezo-electric generating is based on direct piezoelectric effect, and the vibration mechanical energy of environment or human body is converted into electric energy.According to the structure difference of piezoelectric generating device, two kinds of generation modes of collision type piezo-electric generating and bending-type piezo-electric generating are arranged.The collision type generating is that stress changes when utilizing piezoelectric element to be collided, and produces electric energy.And the bending-type piezo-electric generating is when utilizing the piezoelectric element bending, and stress changes, and produces electric energy.
In the bending-type piezoelectric generating device, piezoelectric generally all is to make Piezoelectric Cantilever Beams.Such as Chinese patent CN 100414808C a kind of piezoelectric harvester has been proposed, free end hangs the cantilever beam two sides of lumped mass piece and pastes piezoelectric, in cantilever beam when vibration, is by piezoelectric output electric energy and store, but the electric energy that produces is less, is mainly used in the power supply of microelectronic component.Chinese patent CN101017989A also discloses a kind of piezoelectric cantilever electricity generation system for the micro radio sensing network node power supply, and wherein piezoelectric still sticks on the upper and lower surface of cantilever beam.Chinese patent CN 101262189A discloses a kind of piezoelectric generating device that utilizes cantilever beam, and wherein piezoelectric still sticks on the upper and lower surface of metal cantilever beam.United States Patent (USP) WO2007121092 also described be mainly used in MEMS (micro electro mechanical system) (MEMS) power supply the piezoelectric energy recovery device of cantilever beam structure.Above-mentioned patent of invention all is to utilize the mechanical oscillation of single piezoelectric cantilever to produce electric energy, because the structural limitations of system can only convert the mechanical oscillation of a certain frequency in the external world to electric energy, generating efficiency is low, frequency range is narrow, can only be used for the power supply of miniature electronic system.Chinese patent CN 101272109A discloses a kind of a plurality of piezoelectric cantilevers that utilize two groups of interdigitations, carries out the wideband Blast Furnace Top Gas Recovery Turbine Unit (TRT); Piezoelectric cantilever wherein is directly to be made by piezoelectric element, or makes by piezoelectric element is bonding.In above-mentioned piezoelectric generating device, piezoelectric cantilever is by two kinds of versions, and a kind of is directly with component affixing together, forms the piezoelectric bimorph cantilever beam structure; Another kind is the two sides that piezoelectric element is sticked on other Material Cantilever Beam, forms the sandwich structure piezoelectric cantilever.
In existing piezo-electric generating patent, no matter the Piezoelectric Cantilever Beams of that a kind of form all is to be pasted mutually by the piezoelectric element of monoblock, or sticks on the two sides of other Material Cantilever Beam by the piezoelectric element of monoblock, forms piezoelectric cantilever.In piezoelectric generating device, piezoelectric commonly used is a piezoelectric ceramic.Because the modulus of elasticity of piezoelectric ceramic is bigger, the piezoelectric cantilever single order flexural resonance frequency of being made by the piezoelectric element of monoblock is higher like this, and the mechanical oscillation that provide by natural environment or human body, vibration frequency is generally very low.Like this, in use, be difficult to make piezoelectric cantilever to reach the resonance operating state, the electric energy of generation is fewer, can't satisfy general power supply needs.And by the piezoelectric cantilever that the piezoelectric element of monoblock is made, piezoelectric fragility wherein is bigger, and easy fracture damage influences useful life of whole piezoelectric generating device.
Summary of the invention
The objective of the invention is to overcome the shortcoming of piezoelectric cantilever operating frequency height in the present bending-type piezoelectric generating device, easy fracture damage, a kind of composite type piezoelectric generating device has been proposed, the cantilever slab that utilizes a plurality of two sides to post the multi-disc piezoelectric element carries out the broadband piezoelectric generating, the vibration mechanical energy of natural environment or human body is converted to electric energy, and energy output is big, generating efficiency is high, long service life.
For achieving the above object, the present invention adopts following technical measures:
A kind of composite type piezoelectric generating device is characterized in that: comprise support, be installed on cantilever slab on the support, be pasted on the piezoelectric element of cantilever slab; Wherein above-mentioned cantilever slab is at least 2, and parallel each other, and all has at least the crooked syntony frequency of a part of cantilever slab different with the crooked syntony frequency of other part cantilever slabs in the cantilever slab; This composite type piezoelectric generating device also comprise link an end and cantilever slab the other end link to each other with crust of the device prevent that Oscillation Amplitude is excessive the time cantilever slab between or the elastic rope that collides between cantilever slab and the crust of the device.The material of cantilever slab, density, modulus of elasticity, physical dimension, quality etc. all influence the crooked syntony frequency.
One end of cantilever slab is fixed, other end freedom.The advantage of this structure mainly contains: (1) single order crooked syntony frequency is lower; (2) piezoelectric element is not fragile in use, has increased the useful life of device.This structure changes into electric energy to vibration mechanical energy along with the vibration of surrounding environment.And replace the monoblock piezoelectric element to stick on the cantilever beam one or both sides with the multi-disc piezoelectric element, make the single order crooked syntony frequency of piezoelectric cantilever lower, in natural environment, or when Blast Furnace Top Gas Recovery Turbine Unit (TRT) carried, be easy to make cantilever slab to reach the crooked syntony state, at this moment, the STRESS VARIATION on cantilever slab surface reaches maximum, piezoelectric element output voltage (electric current) also reaches maximum, and generating efficiency is the highest.Simultaneously the piezoelectric element serial or parallel connection on the cantilever slab is connected.If be connected in series, to compare with single piezoelectric element, the output voltage of two piezoelectric elements increases and is twice, and electric current is constant; If be connected in parallel, to compare with single piezoelectric element, the output current of two piezoelectric elements increases and is twice, and voltage is constant.Concrete connecting mode can be according to the demand decision of output electric weight.
But because the piezoelectric element limited amount that paste on single cantilever slab surface, area is less, and the electricity amount is also less; And have only when the vibration frequency of environment approaches the crooked syntony frequency of cantilever beam, higher generating efficiency is just arranged.In order to improve the energy output of whole device in the unit interval, the cantilever slab that a plurality of two sides is posted the multi-disc piezoelectric patches is arranged in parallel.Simultaneously, since the material difference of each cantilever slab, differences such as density, modulus of elasticity, physical dimension, their crooked syntony frequency is also inequality, and whole device has a plurality of crooked syntony frequencies, forms the crooked syntony frequency band of a broad.When the vibration frequency of environment dropped on the crooked syntony frequency band of whole generating device, Blast Furnace Top Gas Recovery Turbine Unit (TRT) will change into electric energy with the vibration mechanical energy of environment with higher efficient, exports bigger electric weight.
But, when the Oscillation Amplitude of environment is excessive, can cause between the cantilever slab, bump between cantilever slab and the crust of the device, piezoelectric element is broken, energy output descends.For fear of the generation of this situation, between cantilever slab and crust of the device, link to each other with rope, when the length of rope is longer than nature, the distance between cantilever slab and the crust of the device, and also rope is flexible.Can be that one of elastomeric material or spring or its combination are made.When the ambient vibration amplitude was excessive, rope just played the effect of protection cantilever slab.
Above-mentioned cantilever slab is installed on support one end and claims stiff end, and the other end is called free end; The free end of above-mentioned part cantilever slab can be equipped with the mass that influences cantilever slab crooked syntony frequency.
Description of drawings
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the structural representation of piezoelectric element.
Fig. 2 is the end view of cantilever slab.
Fig. 3 is the vertical view of cantilever slab.
Fig. 4 is whole generating Unit Installation figure.
Number in the figure title: 1, electrode I, 2, piezoelectric, 3, electrode II, 4, support, 5, cantilever slab, 6, piezoelectric element, 7, crust of the device, 8, elastic rope, 9, mass.
Embodiment
Fig. 1 has described the structure of piezoelectric element, and piezoelectric element comprises piezoelectric 2, electrode electrode I and electrode II.Electrode 1,3 wherein is coated with the two sides that is plated in piezoelectric, and piezoelectric is positioned at the centre of 2 electrodes, similar sandwich structure; The polarised direction of piezoelectric is parallel to thickness direction.Because direct piezoelectric effect when piezoelectric element is subjected to ess-strain, will produce electric charge and voltage on electrode.Piezoelectric 2 is that one of piezoelectric monocrystal, piezoelectric ceramic, piezopolymer, piezo-electricity composite material or its combination are made in the piezoelectric element.All piezoelectric elements adopt the serial or parallel connection mode to connect.
Fig. 2 and Fig. 3 have described the two sides and have pasted the end view and the vertical view of the cantilever slab structure of multi-disc piezoelectric element.Cantilever slab 5 adopts elastic metallic material or composite material.A plurality of piezoelectric elements stick on the upper and lower surface of cantilever slab 5 equably by glue-line; The free end two sides of cantilever slab is equipped with mass 9 symmetrically.The crooked syntony frequency of cantilever slab is determined jointly by material, the physical dimension of cantilever slab, piezoelectric element and mass.When vibration takes place in cantilever slab, stick on the stress that piezoelectric element on the cantilever slab will be subjected to alternation, on the electrode of piezoelectric element, produce electric charge and voltage, convert vibration mechanical energy to electric energy.If cantilever slab generation resonance, then the stress that is subjected to of piezoelectric element will reach maximum, and the electric weight that piezoelectric element produces also can reach maximum.
Fig. 4 has described the installation diagram of whole piezoelectric generating device, and a plurality of have a different structure size, and upper and lower surface is pasted the cantilever slab of multi-disc piezoelectric element, and an end is fixed on the support, other end freedom; Each cantilever slab all has elastic rope 8 separately to link to each other the distance the when length of rope is longer than nature between cantilever slab and crust of the device with crust of the device 7; Whole device is installed in the shell.Because the physical dimension difference of each cantilever slab, its resonance frequency also has nothing in common with each other, and makes whole device have a plurality of resonance frequencys.When the vibration of external environment causes crust of the device and mount vibration, cantilever slab will be vibrated, produce electric energy.When the vibration frequency of external environment during near the resonance frequency of certain cantilever slab, will make this piece cantilever slab generation resonance, the electric weight of generation reaches maximum.Because whole device has a plurality of resonance frequencys, the vibration of external environment causes the resonance of device easily, and farthest the vibrational energy in the absorbing environmental is realized the wideband generating.When the Oscillation Amplitude of external environment was excessive, the elastic rope that links to each other with crust of the device can be held cantilever slab, prevented between the cantilever slab, bumped between cantilever slab and the crust of the device; Simultaneously, prevent that also the Oscillation Amplitude of cantilever slab is excessive, surface stress, strain are excessive, piezoelectric element is cracked or break.
It will be understood by those skilled in the art that composite type piezoelectric generating device of the present invention, wherein, the material of cantilever slab, shape, size, amount of piezoelectric element can be adjusted as the case may be on each cantilever slab.Piezoelectric can be made by one of piezoelectric monocrystal, piezoelectric ceramic, piezopolymer, piezo-electricity composite material or its combination.
Though above literal has been described the present invention with reference to certain embodiments and example of the present invention, the invention is not restricted to embodiment described above.According to know-why of the present invention, those of ordinary skills make amendment and are out of shape with reference to above-mentioned know-why embodiment and all belong to protection scope of the present invention.
Claims (4)
1. composite type piezoelectric generating device is characterized in that:
Comprise support (4), be installed on cantilever slab (5) on the support (4), be pasted on the piezoelectric element (6) of cantilever slab;
Wherein above-mentioned cantilever slab (5) is at least 2, and parallel each other, and all has at least the crooked syntony frequency of a part of cantilever slab different with the crooked syntony frequency of other part cantilever slabs in the cantilever slab;
This composite type piezoelectric generating device also comprise link an end and cantilever slab the other end link to each other with crust of the device (7) prevent that Oscillation Amplitude is excessive the time cantilever slab between or the elastic rope (8) that collides between cantilever slab and the crust of the device.
2. composite type piezoelectric generating device according to claim 1 is characterized in that: described cantilever slab is installed on support one end and claims stiff end, and the other end is called free end; The free end of above-mentioned part cantilever slab is equipped with the mass (9) that influences cantilever slab crooked syntony frequency.
3. composite type piezoelectric generating device according to claim 1 is characterized in that: piezoelectric in the described piezoelectric element (2) is that one of piezoelectric monocrystal, piezoelectric ceramic, piezopolymer, piezo-electricity composite material or its combination are made.
4. composite type piezoelectric generating device according to claim 1 is characterized in that: described cantilever slab (5) adopts elastic metallic material or composite material.
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| CN2010190260864A CN102148587A (en) | 2010-02-05 | 2010-02-05 | Combined type piezoelectric generating set |
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| CN2010190260864A CN102148587A (en) | 2010-02-05 | 2010-02-05 | Combined type piezoelectric generating set |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103166504A (en) * | 2013-04-03 | 2013-06-19 | 重庆大学 | Impact micro-energy harvesting array structure |
| CN103647475A (en) * | 2013-12-16 | 2014-03-19 | 厦门大学 | Wideband piezoelectric vibration energy collecting device |
| GB2507132A (en) * | 2012-11-13 | 2014-04-23 | Perpetuum Ltd | Electromechanical generator for converting mechanical vibration into electrical energy |
| WO2016004476A1 (en) * | 2014-07-07 | 2016-01-14 | Commonwealth Scientific And Industrial Research Organisation | An electromechanical transducer |
| CN106368136A (en) * | 2016-10-08 | 2017-02-01 | 江苏大学 | Piezoelectric type deceleration strip energy recovery device |
| CN106787946A (en) * | 2017-03-07 | 2017-05-31 | 长安大学 | Road vibration energy regenerating TRT and method based on three-dimensional metamaterial |
| CN111585469A (en) * | 2020-06-10 | 2020-08-25 | 中国电子科技集团公司第五十四研究所 | Piezoelectric type self-generating micro-energy collecting device and method |
| CN111614285A (en) * | 2020-06-03 | 2020-09-01 | 南京航空航天大学 | Asymmetric cantilever beam type piezoelectric broadband vibration energy collecting device |
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| CN101272109A (en) * | 2008-05-07 | 2008-09-24 | 中国科学院电工研究所 | Broad-band piezoelectricity oscillating generating set |
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| US20070114890A1 (en) * | 2005-11-23 | 2007-05-24 | Churchill David L | Slotted beam piezoelectric composite |
| CN201054553Y (en) * | 2007-05-29 | 2008-04-30 | 西南科技大学 | Power supply device for radio sensor network node based on piezoelectric porcelain vibration power generation |
| CN101272109A (en) * | 2008-05-07 | 2008-09-24 | 中国科学院电工研究所 | Broad-band piezoelectricity oscillating generating set |
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Cited By (24)
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| GB2507132B (en) * | 2012-11-13 | 2016-07-06 | Perpetuum Ltd | An electromechanical generator for, and method of, converting mechanical vibrational energy into electrical energy |
| US10461670B2 (en) | 2012-11-13 | 2019-10-29 | Perpetuum Ltd. | Generator and method for converting vibrational energy into electrical energy |
| GB2507132A (en) * | 2012-11-13 | 2014-04-23 | Perpetuum Ltd | Electromechanical generator for converting mechanical vibration into electrical energy |
| GB2507880A (en) * | 2012-11-13 | 2014-05-14 | Perpetuum Ltd | Electromechanical generator for converting mechanical vibration into electrical energy |
| GB2507880B (en) * | 2012-11-13 | 2015-03-04 | Perpetuum Ltd | An electromechanical generator for, and method of, converting mechanical vibrational energy into electrical energy |
| CN104956116A (en) * | 2012-11-13 | 2015-09-30 | 佩尔皮图姆有限公司 | An electromechanical generator for, and method of, converting mechanical vibrational energy into electrical energy |
| CN106195105B (en) * | 2012-11-13 | 2019-02-19 | 佩尔皮图姆有限公司 | For converting mechanical vibrational energy in the electromechanical generator and method of electric energy |
| US9941822B2 (en) | 2012-11-13 | 2018-04-10 | Perpetuum Ltd. | Generator and method for converting vibrational energy into electrical energy |
| CN106195105A (en) * | 2012-11-13 | 2016-12-07 | 佩尔皮图姆有限公司 | It is used for being converted into mechanical vibrational energy electromechanical electromotor and the method for electric energy |
| CN106195106A (en) * | 2012-11-13 | 2016-12-07 | 佩尔皮图姆有限公司 | It is used for being converted into mechanical vibrational energy electromechanical electromotor and the method for electric energy |
| CN106195106B (en) * | 2012-11-13 | 2019-01-15 | 佩尔皮图姆有限公司 | For converting mechanical vibrational energy in the electromechanical generator and method of electric energy |
| CN103166504B (en) * | 2013-04-03 | 2015-07-29 | 重庆大学 | A kind of collision type miniature energy gathers array structure |
| CN103166504A (en) * | 2013-04-03 | 2013-06-19 | 重庆大学 | Impact micro-energy harvesting array structure |
| CN103647475B (en) * | 2013-12-16 | 2015-08-12 | 厦门大学 | A kind of broadband piezoelectric energy gathering apparatus |
| CN103647475A (en) * | 2013-12-16 | 2014-03-19 | 厦门大学 | Wideband piezoelectric vibration energy collecting device |
| WO2016004476A1 (en) * | 2014-07-07 | 2016-01-14 | Commonwealth Scientific And Industrial Research Organisation | An electromechanical transducer |
| AU2015286224B2 (en) * | 2014-07-07 | 2019-07-11 | Commonwealth Scientific And Industrial Research Organisation | An electromechanical transducer |
| US10797617B2 (en) | 2014-07-07 | 2020-10-06 | Commonwealth Scientific And Industrial Research Organisation | Electromechanical transducer |
| CN106368136B (en) * | 2016-10-08 | 2018-08-21 | 江苏大学 | A kind of piezoelectric type deceleration strip energy recycle device |
| CN106368136A (en) * | 2016-10-08 | 2017-02-01 | 江苏大学 | Piezoelectric type deceleration strip energy recovery device |
| CN106787946A (en) * | 2017-03-07 | 2017-05-31 | 长安大学 | Road vibration energy regenerating TRT and method based on three-dimensional metamaterial |
| CN106787946B (en) * | 2017-03-07 | 2019-01-18 | 长安大学 | Road vibration energy regenerating power generator and method based on three-dimensional metamaterial |
| CN111614285A (en) * | 2020-06-03 | 2020-09-01 | 南京航空航天大学 | Asymmetric cantilever beam type piezoelectric broadband vibration energy collecting device |
| CN111585469A (en) * | 2020-06-10 | 2020-08-25 | 中国电子科技集团公司第五十四研究所 | Piezoelectric type self-generating micro-energy collecting device and method |
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Application publication date: 20110810 |