CN103532429A - Array type piezoelectric generating device - Google Patents
Array type piezoelectric generating device Download PDFInfo
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- CN103532429A CN103532429A CN201210229251.8A CN201210229251A CN103532429A CN 103532429 A CN103532429 A CN 103532429A CN 201210229251 A CN201210229251 A CN 201210229251A CN 103532429 A CN103532429 A CN 103532429A
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Abstract
The invention discloses an array type piezoelectric generating device. A plurality of cantilever plates with two sides stuck with a plurality of piezoelectric elements are combined together; one end of each cantilever plate is fixed and the other end of each cantilever plate is free; and the different cantilever plates are kept in parallel. As the structural sizes of the cantilever plates are different, the bending resonance frequencies of the cantilever plates are also different. The combined type piezoelectric generating device can convert the mechanical vibration energy of a certain frequency range of an environment into electric energy so as to realize broadband power generating; and as the energy of the plurality of piezoelectric elements is collected, the power generating capacity is larger and the power generating efficiency is higher.
Description
Technical field
The present invention relates to array 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 electronic equipment power supply, makes electronic equipment change battery without frequent, or frequent charge, has improved the non-maintaining property of electronic equipment.Its typical case application is included as the radio-based electronic devices such as wireless senser or radio sensing network, or movable electronic equipment provides electric energy, in national defence field and civil area, all has important using value.
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.Different according to the structure of piezoelectric generating device, there are two kinds of generation modes of collision type piezo-electric generating and bending-type piezo-electric generating.Collision type generating is that while utilizing piezoelectric element to be collided, stress changes, and produces electric energy.And bending-type piezo-electric generating is when utilizing piezoelectric element bending, stress changes, and produces electric energy.
In bending-type piezoelectric generating device, piezoelectric is all generally to make Piezoelectric Cantilever Beams.Such as Chinese patent CN 100414808C has proposed a kind of piezoelectric harvester, free end hangs the cantilever beam two sides of lumped mass piece and pastes piezoelectric, during cantilever beam vibration, by piezoelectric, export electric energy and store, but the electric energy producing is less, be mainly used in the power supply of microelectronic component.Chinese patent CN101017989A also discloses a kind of piezoelectric cantilever electricity generation system for 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) WO 2007121092 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 is all to utilize the mechanical oscillation of single piezoelectric cantilever to produce electric energy, due to the structural limitations of system, the mechanical oscillation of a certain frequency in the external world can only be converted to electric energy, generating efficiency is low, frequency range is narrow, can only be 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 wideband Blast Furnace Top Gas Recovery Turbine Unit (TRT); Piezoelectric cantilever is wherein 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 piezoelectric bimorph cantilever beam structure; Another kind is piezoelectric element to be sticked on to the two sides of other Material Cantilever Beam, forms sandwich structure piezoelectric cantilever.
In existing piezo-electric generating patent, no matter the Piezoelectric Cantilever Beams of that a kind of form, is all mutually to be pasted by the piezoelectric element of monoblock, or by the piezoelectric element of monoblock, is sticked on the two sides of other Material Cantilever Beam, forms piezoelectric cantilever.In piezoelectric generating device, conventional piezoelectric is piezoelectric ceramic.Because the modulus of elasticity of piezoelectric ceramic is larger, the piezoelectric cantilever single order flexural resonance frequency of being made by the piezoelectric element of monoblock is like this higher, and the mechanical oscillation that provided by natural environment or human body, vibration frequency is generally very low.Like this, in use, be difficult to make piezoelectric cantilever to reach resonance operating state, the electric energy of generation is fewer, cannot meet general power supply needs.And, the piezoelectric cantilever of being made by the piezoelectric element of monoblock, piezoelectric fragility is wherein larger, and easy fracture damage affects useful life of whole piezoelectric generating device.
Summary of the invention
The object of the invention is to overcome that piezoelectric cantilever operating frequency in current bending-type piezoelectric generating device is high, the shortcoming of easy fracture damage, a kind of combined type piezoelectric generating set has been proposed, the cantilever slab that utilizes a plurality of two sides to post multi-disc piezoelectric element carries out broadband piezoelectric generating, the vibration mechanical energy of natural environment or human body is converted to electric energy, and energy output is large, generating efficiency is high, long service life.
For achieving the above object, the present invention adopts following technical measures:
A piezoelectric generating device, is characterized in that: comprise support, be installed on cantilever slab on 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 in cantilever slab, has at least the crooked syntony frequency of a part of cantilever slab different from other part cantilever slab crooked syntony frequencies, and cantilever slab crooked syntony frequency is determined by its physical dimension; This combined type piezoelectric generating set also comprise are connected one end and cantilever slab the other end are connected with crust of the device prevent that Oscillation Amplitude is excessive time cantilever slab between or the rope that collides between cantilever slab and crust of the device.
One end of cantilever slab is fixed, and the other end freely.The advantage of this structure mainly contains: (1) single order crooked syntony frequency is lower; (2) piezoelectric element is not fragile in use procedure, has increased the useful life of device.This structure, along with the vibration of surrounding environment, changes into electric energy vibration mechanical energy.And replace monoblock piezoelectric element to stick on cantilever beam one or both sides with 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) is carried, be easy to make cantilever slab to reach crooked syntony state, now, the STRESS VARIATION on cantilever slab surface reaches maximum, piezoelectric element output voltage (electric current) also reaches maximum, and generating efficiency is the highest.Piezoelectric element serial or parallel connection on cantilever slab is connected simultaneously.If be connected in series, to compare with single piezoelectric element, the output voltage increasing of two piezoelectric elements is twice, and electric current is constant; If be connected in parallel, to compare with single piezoelectric element, the output current increasing of two piezoelectric elements is twice, and voltage is constant.Concrete connecting mode, can determine according to the demand of output electric weight.
But due to the piezoelectric element limited amount that paste on single cantilever slab surface, area is less, electricity amount is also less; And only have when the vibration frequency of environment is during close to the crooked syntony frequency of cantilever beam, just have higher generating efficiency.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 to multi-disc piezoelectric patches is arranged in parallel.Meanwhile, because the physical dimension of each cantilever slab is different, their crooked syntony frequency is not identical yet, and whole device has a plurality of crooked syntony frequencies, forms a wider crooked syntony frequency band.When the vibration frequency of environment drops on the crooked syntony frequency band of whole Blast Furnace Top Gas Recovery Turbine Unit (TRT), Blast Furnace Top Gas Recovery Turbine Unit (TRT) will change into electric energy by the vibration mechanical energy of environment with higher efficiency, exports larger electric weight.
But, when the Oscillation Amplitude of environment is excessive, can cause between cantilever slab, bump between cantilever slab and crust of the device, easily make piezoelectric element break, energy output declines.For fear of the generation of this situation, between cantilever slab and crust of the device, with rope, be connected, when the length of rope is longer than nature, the distance between cantilever slab and crust of the device, and also rope is flexible.Can be that elastomeric material or spring one or a combination set of are made.When ambient vibration amplitude is excessive, rope just plays 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 provided with the mass that affects cantilever slab crooked syntony frequency.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention.
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 the installation diagram of whole Blast Furnace Top Gas Recovery Turbine Unit (TRT).
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 is wherein 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.Due to direct piezoelectric effect, when piezoelectric element is subject to ess-strain, will on electrode, produce electric charge and voltage.In piezoelectric element, piezoelectric 2 is that piezoelectric monocrystal, piezoelectric ceramic, piezopolymer, piezo-electricity composite material one or a combination set of are made.All piezoelectric elements adopt serial or parallel connection mode to connect.
Fig. 2 and Fig. 3 have described end view and the vertical view that the cantilever sheet design of multi-disc piezoelectric element has been pasted on two sides, and 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 provided 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 there is vibration in cantilever slab, stick on piezoelectric element on cantilever slab by being subject to the stress of alternation, on the electrode of piezoelectric element, produce electric charge and voltage, convert vibration mechanical energy to electric energy.If cantilever slab generation resonance, the stress being subject 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 one end is fixed on support, and the other end freely; Each cantilever slab has elastic rope 8 to be separately connected with crust of the device 7, the distance when length of rope is longer than nature between cantilever slab and crust of the device; Whole device is arranged in shell.Because the physical dimension of each cantilever slab is different, its resonance frequency is also different, makes whole device have a plurality of resonance frequencys.When the vibration of external environment causes crust of the device and mount vibration, also will make cantilever slab vibrate, produce electric energy.When the vibration frequency of external environment approaches 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 easily causes the resonance of device, and farthest the vibrational energy in absorbing environmental, realizes wideband generating.When the Oscillation Amplitude of external environment is excessive, the elastic rope being connected with crust of the device can be held cantilever slab, prevents between cantilever slab, bumps between cantilever slab and crust of the device; Meanwhile, also prevent that 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 array piezoelectric generating device of the present invention, wherein, the material of cantilever slab, shape, size, on each cantilever slab, the quantity of piezoelectric element can be adjusted as the case may be.Piezoelectric can be made by piezoelectric monocrystal, piezoelectric ceramic, piezopolymer, piezo-electricity composite material one or a combination set of.
Although above word has been described the present invention with reference to specific embodiment 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 modify and are out of shape with reference to above-mentioned know-why embodiment and all belong to protection scope of the present invention.
Claims (2)
1. an array piezoelectric generating device, is characterized in that:
Comprise support (4), be installed on cantilever slab (5) on 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 in cantilever slab, have at least the crooked syntony frequency of a part of cantilever slab different from other part cantilever slab crooked syntony frequencies, cantilever slab crooked syntony frequency is determined by its quality, structure, size;
This combined type piezoelectric generating set also comprise are connected one end and cantilever slab the other end are connected with crust of the device (7) prevent that Oscillation Amplitude is excessive time cantilever slab between or the elastic rope (8) that collides between cantilever slab and crust of the device.
2. array 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 provided with affects the mass of cantilever slab crooked syntony frequency (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210229251.8A CN103532429A (en) | 2012-07-04 | 2012-07-04 | Array type piezoelectric generating device |
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| CN201210229251.8A CN103532429A (en) | 2012-07-04 | 2012-07-04 | Array type piezoelectric generating device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796037A (en) * | 2015-04-22 | 2015-07-22 | 北京工业大学 | Wideband piezoelectric power generating device |
| CN106856380A (en) * | 2017-01-12 | 2017-06-16 | 合肥工业大学 | A kind of multi-modal array cantilever beam piezoelectric energy collecting device in space |
| US11736043B2 (en) | 2019-08-01 | 2023-08-22 | Katrick Technologies Limited | Energy harvesting system and method of manufacture |
-
2012
- 2012-07-04 CN CN201210229251.8A patent/CN103532429A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796037A (en) * | 2015-04-22 | 2015-07-22 | 北京工业大学 | Wideband piezoelectric power generating device |
| CN106856380A (en) * | 2017-01-12 | 2017-06-16 | 合肥工业大学 | A kind of multi-modal array cantilever beam piezoelectric energy collecting device in space |
| US11736043B2 (en) | 2019-08-01 | 2023-08-22 | Katrick Technologies Limited | Energy harvesting system and method of manufacture |
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Addressee: Yangzhou Boda Electric Equipment Co., Ltd. Document name: Notification that Application Deemed to be Withdrawn |
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Application publication date: 20140122 |