CN104900797B - A kind of piezoelectric vibrator - Google Patents
A kind of piezoelectric vibrator Download PDFInfo
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- CN104900797B CN104900797B CN201510315555.XA CN201510315555A CN104900797B CN 104900797 B CN104900797 B CN 104900797B CN 201510315555 A CN201510315555 A CN 201510315555A CN 104900797 B CN104900797 B CN 104900797B
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- 239000000463 material Substances 0.000 claims abstract description 48
- 229920001971 elastomer Polymers 0.000 claims abstract description 26
- 239000000806 elastomer Substances 0.000 claims abstract description 26
- 239000004020 conductor Substances 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 44
- 239000007769 metal material Substances 0.000 claims description 5
- 239000012790 adhesive layer Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 210000004027 cell Anatomy 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 230000011218 segmentation Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 5
- 230000010355 oscillation Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The application piezoelectric vibrator includes folded laminar elastomer, the elastomer includes at least three elastic beam elements being parallel to each other, connected between per the two neighboring elastic beam element by rigid connector, the elastic beam element at elastomer two ends is connected with rigid block by rigid connector.The surface of any one or more elastic beam elements is provided with piezoelectric material layer, and contact conductor is provided with piezoelectric material layer, for extracted current.Using the application piezoelectric vibrator when, the rigid block of either end is fixed on vibration source, the vibration of vibration source will be transferred to elastic beam element by mass, elastic beam element is caused to produce first-order flexure deformation vibration, the vibration of second order Bending Deformation and the vibration of single order torsional deformation, there is certain proportion relation in the vibration frequency of three mode of oscillations, so as to produce multiple resonance modes in frequency range wider near first order resonance frequency, the frequency response range of piezoelectric vibrator is expanded.
Description
Technical field
The application is related to piezoelectricity applied technical field, more specifically to a kind of piezoelectric vibrator.
Background technology
Piezoelectric vibrator major function is that industrial production, the vibrational energy in living environment that will be collected are converted to electric energy, so
Powered afterwards for other micro energy lose electronic components.
To the vibrational energy in collection environment, generally require vibrational energy converter, namely piezoelectric vibrator resonance frequency
Rate is close or equal to the vibration frequency of environment, so as to improve energy conversion efficiency.Inventor to existing piezoelectricity by shaking
Son is studied, it is found that existing piezoelectric vibrator only exists single order mode of oscillation, namely its working frequency in first order resonance frequency
Near, its response range is very narrow.If vibration source frequency changes, the resonant frequency of existing piezoelectric vibrator can not adapt to this change
Change, it will cause the energy conversion efficiency of piezoelectric vibrator to drastically reduce, it is impossible to efficiently accomplish the conversion of energy.
The content of the invention
It is in view of this, narrow for solving existing piezoelectric vibrator frequency response range this application provides a kind of piezoelectric vibrator,
When vibration source frequency changes, it is impossible to efficiently accomplish the problem of energy is changed.
To achieve these goals, it is proposed that scheme it is as follows：
A kind of piezoelectric vibrator, including：
Folded laminar elastomer, the folded laminar elastomer includes at least three elastic beam elements being parallel to each other, often
Connected between the two neighboring elastic beam element by rigid connector, the elasticity at the folded laminar elastomer two ends
Beam element is connected with rigid block by rigid connector, and the surface of any one or more elastic beam elements is set
There is piezoelectric material layer, piezoelectric material layer is provided with contact conductor.
Preferably, the rigid block phase that the elastic beam element at the folded laminar elastomer two ends is connected respectively
Mutually it be arranged in parallel.
Preferably, the folded laminar elastomer is the folded laminar elastomer of metal material, the folded laminar elasticity
The surface that piezoelectric material layer is not provided with body is coated with insulated paint.
Preferably, several piezoelectric material layers that the piezoelectric material layer that the spring beam cell surface is set is split for insulation
Region, each piezoelectric material layer region is provided with contact conductor.
Preferably, the piezoelectric material layer is equally distributed four piezoelectric material layer regions.
Preferably, the number of the elastic beam element is 3.
Preferably, the piezoelectric material layer is pasted onto the surface of the elastic beam element by thin conductive adhesive layer.
Preferably, the piezoelectric material layer is piezoelectric ceramics or piezoelectric monocrystal, its polarised direction through-thickness.
Preferably, the elastic beam element, the rigid connector and the rigid block are formed in one structure.
Preferably, the rigid block and the elastic beam element are rectangular shape.
It can be seen from above-mentioned technical scheme that, the piezoelectric vibrator that the embodiment of the present application is provided includes folded laminar elasticity
Body, the elastomer includes passing through between at least three elastic beam elements being parallel to each other, every two neighboring elastic beam element
Rigid connector is connected, and the elastic beam element at elastomer two ends is connected with rigid block by rigid connector.
The surface of any one or more elastic beam elements is provided with piezoelectric material layer, and is provided with electrode on piezoelectric material layer and draws
Line, for extracted current.Using the application piezoelectric vibrator when, the rigid block of either end is fixed on vibration source, shaken
The vibration in source will be transferred to elastic beam element by mass, thus cause elastic beam element produce first-order flexure deformation vibration,
Second order Bending Deformation vibrates and the vibration of single order torsional deformation, and the vibration frequency of three mode of oscillations has certain proportion relation, from
And can be wider near first order resonance frequency frequency range in produce multiple mechanical resonance mode, effectively expand piezoelectricity and shake
The frequency response range of son, improves energy conversion efficiency.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of application, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of structural representation of piezoelectric vibrator disclosed in the embodiment of the present application；
Fig. 2 is the side view for the elastic beam element that piezoelectric material layer is provided with disclosed in the embodiment of the present application；
Fig. 3 is a kind of piezoelectric material layer region segmentation floor map disclosed in the embodiment of the present application；
Fig. 4 is piezoelectric vibrator first-order modal schematic diagram disclosed in the embodiment of the present application；
Fig. 5 is piezoelectric vibrator second-order modal schematic diagram disclosed in the embodiment of the present application；
Fig. 6 is the rank mode schematic diagram of piezoelectric vibrator three disclosed in the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
Understand that piezoelectric vibrator includes disclosed in the embodiment of the present application referring to Fig. 1-Fig. 3：
Folded laminar elastomer 1, the folded laminar elastomer 1 includes at least three elastic beam elements being parallel to each other
11, often connected between the two neighboring elastic beam element 11 by rigid connector 12, the two ends of folded laminar elastomer 1
The elastic beam element 11 rigid block 2, any one or more elasticity are connected with by rigid connector 12
The surface of beam element 11 is provided with piezoelectric material layer 13, and piezoelectric material layer 13 is provided with contact conductor 14.
Wherein, elastic beam element 11, rigid connector 12 and rigid block 2 can pass through integrated machine-shaping.When
So, it can also be made up of other manners such as welding.
It can select to be respectively provided with piezoelectric material layer 13 to each elastic beam element 11 in the present embodiment, can also select pair
Partial elastic beam element 11 sets piezoelectric material layer 13.For setting the elastic beam element 11 of piezoelectric material layer 13, it can
To set piezoelectric material layers 13 in any one of two surfaces up and down of elastic beam element 11 or two surfaces.
Optionally, piezoelectric material layer 13 is pasted onto the surface of the elastic beam element 11 by thin conductive adhesive layer.Piezoresistive material
The bed of material 13 can be piezoelectric ceramics or piezoelectric monocrystal, its polarised direction through-thickness.
The piezoelectric vibrator that the embodiment of the present application is provided includes folded laminar elastomer, and it is mutual that the elastomer includes at least three
Connected between parallel elastic beam element, every two neighboring elastic beam element by rigid connector, elastomer two ends
The elastic beam element is connected with rigid block by rigid connector.In the table of any one or more elastic beam elements
Face is provided with piezoelectric material layer, and is provided with contact conductor on piezoelectric material layer, for extracted current.Using the application's
During piezoelectric vibrator, the rigid block of either end is fixed on vibration source, the vibration of vibration source will be transferred to bullet by mass
Property beam element so that causing elastic beam element to produce first-order flexure deformation vibration, the vibration of second order Bending Deformation and single order reverses shape
Become vibration, the vibration frequency of three mode of oscillations has certain proportion relation, so as to wider near first order resonance frequency
Frequency range in produce multiple mechanical resonance mode, effectively expand the frequency response range of piezoelectric vibrator, improve energy and turn
Change efficiency.
For the ease of understanding in the course of work of the application piezoelectric vibrator, the present embodiment only with the number of elastic beam element 11
For 3, rigid block 2 and elastic beam element 11 are to illustrate exemplified by rectangle, referring to Fig. 4-6：
For the ease of statement, we are using piezoelectric vibrator length direction as x-axis, and piezoelectric vibrator thickness direction is y-axis, and piezoelectricity shakes
Sub- short transverse is z-axis, and o points are the central point of the rigid block 2 of piezoelectric vibrator.
Fig. 4 show the first step mode vibration shape of piezoelectric vibrator, when rigid block 2 is in xz planes, the non-zero place of x coordinate
By z-axis direction power when, piezoelectric vibrator is vacillated now to the left, now to the right in xz planes, with for the elastic beam element 11 that is marked in Fig. 4, its
Bending Deformation vibration can be produced, and then drives the piezoelectric material layer deformation being arranged on, so as to produce electric current.
Fig. 5 show the second-order Mode Shape of piezoelectric vibrator, and when rigid block 2 is in xz planes, x coordinate is at 0
By z-axis direction power when, piezoelectric vibrator up-down vibration in xz planes, with for the elastic beam element 11 that is marked in Fig. 5, its
The vibration of second order Bending Deformation can be produced, and then drives the piezoelectric material layer deformation being arranged on, so as to produce electric current.
Fig. 6 show the 3rd rank Mode Shape of piezoelectric vibrator, when rigid block 2 is in yz planes, the non-zero place of y-coordinate
By z-axis direction power when, piezoelectric vibrator is vacillated now to the left, now to the right in yz planes, with for the elastic beam element 11 that is marked in Fig. 6, its
The vibration of single order torsional deformation can be produced, and then drives the piezoelectric material layer deformation being arranged on, so as to produce electric current.
For three kinds of Mode Shapes of above-mentioned example, the intrinsic frequency ratio relation substantially 1 of each model:1.4:
2.1.By the volume for adjusting piezoelectric vibrator so that it is attached that the intrinsic frequency of the first-order modal vibration shape is maintained at environment vibration source low-limit frequency
Closely (about 1Hz).
Optionally, in order to ensure the elasticity of folded laminar elastomer 1, metal material can be selected as folded laminar elasticity
Body 1.
Further, for the sake of security, can be by folded laminar elasticity when folded laminar elastomer 1 is metal material
On body 1, the surface coating insulated paint of piezoelectric material layer 13 is not provided with.
Further, when folded laminar elastomer 1 is metal material, if for some elastic beam element 11 above and below it
Surface is provided with piezoelectric material layer 13, then the common electrical of two piezoelectric material layers 13 up and down can be used as using elastic beam element 11
Extremely.
Optionally, for two rigid blocks 2 up and down, it could be arranged to the structure that is parallel to each other.Certainly, for
For rigid block 2 and elastic beam element 11, it can also be the structure that is parallel to each other.
With further reference to shown in Fig. 3, for piezoelectric material layer 13, it can be split by insulating, and be divided into multiple
Region, shown in Fig. 3 for 4 area formats.For each piezoelectric material layer region, it is required to set contact conductor.Tool
Body way can carry out electric electrode corrosion by the electrode surface to piezoelectric material layer side, be divided into the shape shown in Fig. 3, another
Uniformly smear the surface that elastic beam element is fixed in after conducting resinl in lateral electrode face.
By carrying out region division to piezoelectric material layer, the electric charge that piezoelectric material layer can be avoided to produce is partially neutralized
Fall, cause total electrical charge to reduce, influence output current.By taking the both modalities which vibration shape shown in Fig. 5 and Fig. 6 as an example, in Fig. 5 work
Under state, now the opposite region of stress distribution occurs along along x length directions for elastic beam element, and then the electric charge produced is positive and negative
If on the contrary, without region division, the situation that Partial charge is mutually neutralized occurs.Under Fig. 6 working condition, this
When elastic beam element the opposite region of stress distribution occurs along x length directions, stress distribution phase also occurs along thickness y directions
Mutual region, if without region division, the situation that Partial charge is mutually neutralized equally occurs.
Finally, in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include that
A little key elements, but also other key elements including being not expressly set out, or also include be this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except also there is other identical element in the process including the key element, method, article or equipment.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the application.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case where not departing from spirit herein or scope.Therefore, the application
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (9)
1. a kind of piezoelectric vibrator, it is characterised in that including：
Folded laminar elastomer, the folded laminar elastomer includes at least three elastic beam elements being parallel to each other, per adjacent
Connected between two elastic beam elements by rigid connector, the spring beam list at the folded laminar elastomer two ends
Member is connected with rigid block by rigid connector, and the surface of any one or more elastic beam elements is provided with pressure
Material layer, piezoelectric material layer is provided with contact conductor；
The piezoelectric material layer that the spring beam cell surface is set is several piezoelectric material layer regions of insulation segmentation, each pressure
Material layer region is provided with contact conductor.
2. piezoelectric vibrator according to claim 1, it is characterised in that the elasticity at the folded laminar elastomer two ends
The rigid block that beam element is connected respectively is arranged in parallel.
3. piezoelectric vibrator according to claim 1, it is characterised in that the folded laminar elastomer is the folding of metal material
The surface that piezoelectric material layer is not provided with folded elastic multilayer, the folded laminar elastomer is coated with insulated paint.
4. piezoelectric vibrator according to claim 1, it is characterised in that the piezoelectric material layer is equally distributed four pressures
Material layer region.
5. piezoelectric vibrator according to claim 1, it is characterised in that the number of the elastic beam element is 3.
6. piezoelectric vibrator according to claim 1, it is characterised in that the piezoelectric material layer is pasted by thin conductive adhesive layer
On the surface of the elastic beam element.
7. piezoelectric vibrator according to claim 1, it is characterised in that the piezoelectric material layer is piezoelectric ceramics or piezoelectricity list
Crystalline substance, its polarised direction through-thickness.
8. piezoelectric vibrator according to claim 1, it is characterised in that the elastic beam element, the rigid connector with
The rigid block is formed in one structure.
9. piezoelectric vibrator according to claim 1, it is characterised in that the rigid block and the elastic beam element are equal
For rectangular shape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510315555.XA CN104900797B (en) | 2015-06-10 | 2015-06-10 | A kind of piezoelectric vibrator |
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| CN201510315555.XA CN104900797B (en) | 2015-06-10 | 2015-06-10 | A kind of piezoelectric vibrator |
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| CN104900797B true CN104900797B (en) | 2017-10-03 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515442B (en) * | 2015-12-04 | 2017-12-12 | 国网江西省电力科学研究院 | A kind of mortar type piezoelectric harvester |
| CN107508497A (en) * | 2017-08-28 | 2017-12-22 | 佛山市顺德区中山大学研究院 | A kind of vibration energy collector of folded form |
| CN107547005A (en) * | 2017-09-14 | 2018-01-05 | 苏州迈客荣自动化技术有限公司 | A kind of novel piezo-electric ceramic actuator |
| CN109980992A (en) * | 2017-12-28 | 2019-07-05 | 华北电力大学 | A kind of multi-resonant vibrational energy acquisition device |
| CN109217727A (en) * | 2018-08-31 | 2019-01-15 | 北京信息科技大学 | Fold-line-shaped structure piezoelectric cantilever type vibration energy recovery device |
| CN112019088B (en) * | 2020-09-10 | 2024-03-15 | 重庆大学 | Paper folding coupling broadband nonlinear piezoelectric vibration power generation device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1197548A (en) * | 1995-08-25 | 1998-10-28 | 三井化学株式会社 | Piezoelectric oscillator component, structure for supporting piezoelectric oscillator and method of mounting piezoelectric oscillator |
| CN1576785A (en) * | 2003-07-25 | 2005-02-09 | 精工爱普生株式会社 | Piezoelectric vibrating element, supporting structure therefor, piezoelectric vibrator and piezoelectric vibrating gyroscope |
| CN102495914A (en) * | 2011-10-31 | 2012-06-13 | 中南大学 | Design method of two-degree-of-freedom piezoelectric vibrator for realizing broadband response |
| CN103944448A (en) * | 2014-04-10 | 2014-07-23 | 南京邮电大学 | Piezoelectric cantilever beam energy harvester |
| CN104270034A (en) * | 2014-10-20 | 2015-01-07 | 吉林大学 | Curved surface piezoelectric power generation cantilever beam |
-
2015
- 2015-06-10 CN CN201510315555.XA patent/CN104900797B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1197548A (en) * | 1995-08-25 | 1998-10-28 | 三井化学株式会社 | Piezoelectric oscillator component, structure for supporting piezoelectric oscillator and method of mounting piezoelectric oscillator |
| CN1576785A (en) * | 2003-07-25 | 2005-02-09 | 精工爱普生株式会社 | Piezoelectric vibrating element, supporting structure therefor, piezoelectric vibrator and piezoelectric vibrating gyroscope |
| CN102495914A (en) * | 2011-10-31 | 2012-06-13 | 中南大学 | Design method of two-degree-of-freedom piezoelectric vibrator for realizing broadband response |
| CN103944448A (en) * | 2014-04-10 | 2014-07-23 | 南京邮电大学 | Piezoelectric cantilever beam energy harvester |
| CN104270034A (en) * | 2014-10-20 | 2015-01-07 | 吉林大学 | Curved surface piezoelectric power generation cantilever beam |
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