CN103199736A - Composite structure piezoelectric energy collector driven by cantilever - Google Patents
Composite structure piezoelectric energy collector driven by cantilever Download PDFInfo
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Abstract
The invention relates to a composite structure piezoelectric energy collector driven by a cantilever. The energy collector comprises a cantilever member and an output unit used for output of generated electric energy output, one end of the cantilever is a fixed end which is fixed on a base, the other end of the cantilever is a free end, a pair of piezoelectric energy converting units are respectively symmetrically arranged on the portions, near the fixed end of the cantilever member, of the upper surface and the lower surface of the cantilever member, and the piezoelectric energy converting units are driven by vibration of the cantilever member to generate electric energy.
Description
Technical field
The present invention relates to piezoelectric energy and collect and the novel energy devices field, more specifically, relate to the composite construction piezo-electric type energy harvester that a kind of cantilever beam that can collect the environment vibrational energy drives.
Background technology
The energy and environment are the most important two principal themes that the 21 century mankind pay close attention to.Along with expanding economy, fossil energy resources such as coal, oil reduce because constantly consuming day by day.Therefore, various regenerative resources are all being greatly developed in countries in the world, and hope can collect the energy that can recycle in the environment and change.The piezo-electric type energy harvester is exactly a kind of device of realizing this function, and it is the direct piezoelectric effect of utilizing piezoelectric, collects the various vibrational energies in the environment and is converted into electric energy.The piezo-electric type energy harvester is by the certain structure form ambient vibration to be coupled to piezoelectric element, utilizes ambient vibration to induce the malformation of this piezoelectric element, causes that the positive and negative charge center of this piezoelectric element inside is separated, thereby produces polarizing voltage.With this direct piezoelectric effect by this piezoelectric element, realized the conversion of vibrational energy to electric energy.The piezo-electric type energy harvester have electromechanical conversion efficiency height, output voltage height, simple in structure, volume is little, the integrated requirement that is content with very little, need not outer characteristics such as be biased, and do not produce noise, be not subjected to electromagnetic interference, so the piezo-electric type energy harvester has received increasing concern.
In recent years along with the development of piezoelectric actuator and piezoelectric energy collection technique, people have designed and produced the PZT (piezoelectric transducer) of various structures, such as cantilever beam structure, laminated construction and big cymbals (Cymbal) structure that occurs in recent years, THUNDER structure (THin Layer Unimorph Ferroelectric DrivER), RAINBOW structures (Reduced And Internally Biased Oxide Wafer) etc., wherein the big cymbals structure has shown superior and particular performances in numerous PZT (piezoelectric transducer) structures.
The PZT (piezoelectric transducer) of big cymbals structure is by the piezoelectricity disk of centre and bonding the forming of metal cap that lays respectively at two lip-deep two big cymbals shapes up and down of this piezoelectricity disk.In the PZT (piezoelectric transducer) of this big cymbals structure, the cavity that forms between big cymbals shape metal cap and the piezoelectricity disk is amplified the piezoelectric constant of piezoelectricity disk.When the big cymbals structure is subjected to the pressure of vertical direction, metal cap can pass to the power of part vertical direction the piezoelectricity disk, and this power is transformed into the power of horizontal direction, this piezoelectricity disk namely can be subjected to stretching action and deformation takes place, thereby produces electric charge at electrode layer.
For example, in the CN2676155Y Chinese patent is open, put down in writing a kind of big cymbals transducer, it is made of big cymbals shape metal box-lid and piezoelectric ceramic ring, piezoelectric ceramic ring between two big cymbals shape metal box-lids, between two big cymbals shape metal box-lids and the piezoelectric ceramic ring with conductive adhesive and at two big cymbals shape metal box-lids extraction electrodes respectively.
Collect in the application at piezoelectric energy, the high-energy-density characteristic that the PZT (piezoelectric transducer) of big cymbals structure shows is known together by everybody.But the high shortcoming of piezoelectric energy gatherer ubiquity resonance frequency of big cymbals structure.Since ambient vibration can frequency generally below 300Hz, but the resonance frequency of the piezoelectric energy gatherer of big cymbals structure is difficult to be lower than 500kHz, thereby the PZT (piezoelectric transducer) of big cymbals structure is difficult to collect effectively the environment vibrational energy.Therefore, the drawbacks limit of the high resonance frequency of big cymbals structure PZT (piezoelectric transducer) its application at the piezoelectric energy assembling sphere.
Cantilever beam structure is that another is in the widely used PZT (piezoelectric transducer) structure of piezoelectric energy assembling sphere.For example, in the CN201821288U Chinese patent is open, put down in writing a kind of piezoelectric energy gathering-device of cantilever beam structure, comprise that an end is fixed on the cantilever beam on the vibrational structure body, and being arranged on removable mass on this cantilever beam and at least one piezoelectric patches, this piezoelectric energy gathering-device makes each piezoelectric patches influenced by STRESS VARIATION by the cantilever vibration of beam and produces electric energy.
The maximum characteristics of the PZT (piezoelectric transducer) of existing all kinds of cantilever beam structures are to have low resonant frequency at present.But the PZT (piezoelectric transducer) of existing cantilever beam structure all has the low defective of energy density; Because in cantilever beam structure, the stress distribution of piezoelectric inside is inhomogeneous.The stress maximum of stiff end, and free-ended stress is 0, has so just limited the performance of free end piezoelectric transduction.
Summary of the invention
The composite construction piezo-electric type energy harvester that the object of the present invention is to provide a kind of cantilever beam to drive can greatly reduce its resonance frequency, improves energy density and power output.
To achieve these goals, the invention provides the composite construction piezo-electric type energy harvester that a kind of cantilever beam drives, comprising: a cantilevered beam members, one end are the stiff end that is fixed to pedestal, and the other end is free end; Respectively symmetrically in a pair of piezoelectric energy-conversion unit that upper surface and the lower surface of described cantilevered beam members are settled, described piezoelectric energy-conversion unit drives to produce electric energy by the vibration of described cantilevered beam members near the stiff end of described cantilevered beam members; And the output unit that is used for the electric energy output that will produce.
Piezo-electric type energy harvester of the present invention is adhered to being composited on two surfaces up and down of cantilevered beam members with low resonant frequency by the piezoelectric energy-conversion unit symmetry that will have the high-energy-density characteristic, can greatly reduce the resonance frequency of piezoelectric energy-conversion unit, and the energy density of raising cantilever beam structure, thereby can collect the vibrational energy in the environment effectively and be converted into electric energy.And pass through the cantilevered beam members amplification of mechanics excitation to external world, can improve energy density and the power output of piezo-electric type energy harvester.Piezo-electric type energy harvester of the present invention has low resonant frequency, high-energy-density, the convenient adjustable characteristic of resonance frequency.Thereby the present invention can greatly promote the development of piezoelectric energy collection technique.
In the present invention, also can, this piezo-electric type energy harvester also comprises the fixed component of stiff end, pedestal and piezoelectric energy-conversion unit for the described cantilevered beam members of clamping.
Adopt this structure, the vibration of cantilevered beam members drives the piezoelectric energy-conversion cell operation with fixed component, can when cantilevered beam members is vibrated, pass to driven piezoelectric energy-conversion unit to pressure rapidly, thereby can more effectively improve the performance of vibrational energy in this piezoelectric energy gatherer collection and the conversion environment.
In the present invention, can described piezoelectric energy-conversion unit be the piezoelectric energy-conversion unit with big cymbals shape structure also, piezoelectric in the middle of comprising and be adhered to the upper surface of described piezoelectric respectively and the metal cap of two big cymbals shapes on the lower surface, described output unit comprise respectively the lead of drawing from a free-ended side of the close described cantilevered beam members of each metal cap.
Adopt this structure, be arranged at symmetrically by the piezoelectric energy-conversion unit with big cymbals shape structure on the upper surface and lower surface of cantilevered beam members, be conducive to reduce the resonance frequency of big cymbals structure, and improve the energy density of cantilever beam structure, improve the performance of piezo-electric type energy harvester effectively.
In the present invention, can described piezoelectric energy-conversion unit be the piezoelectric energy-conversion unit with laminated construction also, described laminated construction comprises the multi-layer piezoelectric material of cementation laminated, and described output unit comprises respectively the lead of drawing from a free-ended side of the close described cantilevered beam members of the piezoelectric material layer of the top layer of described laminated construction and bottom.
Adopt the piezo-electric type energy harvester of this structure, can reduce resonance frequency, improve energy density, and simple in structure, be easy to make, can save manufacturing process and cost.
In the present invention, can described piezoelectric energy-conversion unit be to have the curved piezoelectric energy-conversion unit of opening structure of " V " shape that comprises recessed big cymbals shape structure, crescent structure or drum organization also.
Adopt this structure, be arranged at symmetrically on the upper surface and lower surface of cantilevered beam members by having the curved piezoelectric energy-conversion unit of opening structure of " V " shape, be conducive to reduce the resonance frequency of piezo-electric type energy harvester, and improve its energy density, to improve the performance of collecting the environment vibrational energy and changing.
In the present invention, can described piezoelectric energy-conversion unit be the piezoelectric energy-conversion unit with warp architecture also.
Adopt this structure, also can reduce the resonance frequency of piezo-electric type energy harvester, and improve its energy density, to improve the performance of collecting the environment vibrational energy and changing.
In the present invention, can described piezoelectric energy-conversion unit be the chip type piezoelectric oscillator also.
Adopt this structure, on two surfaces up and down that the chip type piezoelectric oscillator are placed in symmetrically cantilevered beam members, can utilize the squeezing action of cantilevered beam members, excite the d33 pattern of piezoelectric vibrator, therefore can produce more energy.
In the present invention, can described fixed component be " U " shape framework also, described " U " shape framework is towards the free-ended direction opening of described cantilevered beam members, hold and fix stiff end, pedestal and the piezoelectric energy-conversion unit of described cantilevered beam members, and described pedestal embeds the bottom of described U-shaped framework.
Adopt this structure, stiff end, pedestal and piezoelectric energy-conversion unit that can simple and reliable ground clamping cantilevered beam members be more effectively to pass to driven piezoelectric energy-conversion unit to pressure rapidly when cantilevered beam members is vibrated.
The mass that also can also comprise in the present invention, the free end that is arranged at described cantilevered beam members.
Adopt this structure, can regulate the resonance frequency of whole piezo-electric type energy harvester.And the quality by changing this mass and with respect to the position of cantilevered beam members perhaps also can be regulated resonance frequency by changing the brachium of this cantilevered beam members easily, makes its realistic application demand.
In the present invention, also can also comprise at least one piezoelectric that is arranged on the described cantilevered beam members, and be soldered to the lead on this piezoelectric.
Adopt this structure, increased the utilance of cantilevered beam members, and then improve the efficient that ambient vibration can be converted to electric energy effectively.
In the present invention, also can select piezoelectric ceramic, piezoelectric crystal, organic piezoelectric materials or leadless piezoelectric material material for use by described piezoelectric.
The present invention can select piezoelectric ceramic, piezoelectric crystal, organic piezoelectric materials or leadless piezoelectric material material for use.All can be used for making composite construction piezo-electric type energy harvester of the present invention so long as have the piezoelectric of high piezoelectric constant and high electromechanical coupling factor and dielectric constant, therefore be conducive to the manufacturing of this piezo-electric type energy harvester.
In the present invention, also can described piezoelectric for adopting the PMNT monocrystal material of improved Bridgman (Bridgman) method growth, and its be oriented to＜001 or＜110, component is 0.20≤x≤0.40.
Adopt the present invention, can improve uniformity and the rate of finished products of piezoelectric, and has a best piezoelectric property, be particularly conducive to and make up the composite construction piezo-electric type energy harvester that comprises the big cymbals structure piezoelectric energy-conversion unit that is driven by cantilever beam, can effectively improve the power conversion effect of piezo-electric type energy harvester of the present invention.
In the present invention, can described piezoelectric be the PZT5H piezoelectric ceramic also.
Adopt the present invention, utilize the good PZT5H series piezoelectric ceramic of piezoelectric property, be conducive to make up the composite construction piezo-electric type energy harvester that comprises the laminated construction piezoelectric energy-conversion unit that is driven by cantilever beam, can effectively improve the power conversion effect of piezo-electric type energy harvester of the present invention.
Description of drawings
Fig. 1 shows first embodiment of piezo-electric type energy harvester of the present invention.
Fig. 2 shows second embodiment of piezo-electric type energy harvester of the present invention.
Embodiment
By below in conjunction with accompanying drawing the preferred embodiments of the present invention being described in detail, can understand purpose of the present invention, feature and advantage better.
Fig. 1 shows first embodiment of piezo-electric type energy harvester of the present invention.As shown in Figure 1, this piezo-electric type energy harvester comprises the cantilever beam 1 of a horizontal expansion, and an end of this cantilever beam 1 is the stiff end that is fixed to pedestal 2, and the other end of this cantilever beam 1 is free end.A pair of big cymbals structure PZT (piezoelectric transducer) 3 is arranged at respectively on the upper surface and lower surface of this cantilever beam 1 symmetrically at the stiff end place of this cantilever beam 1.By this is symmetricly set on two surfaces up and down of cantilever beam PZT (piezoelectric transducer) 3, can take full advantage of cantilever beam and swing up and down middle tension stress and the compression that produces, improve the energy density of device.This cantilever beam 1 is subjected to the excitation of ambient vibration and the vibration that produces vertical direction.This to carry out work, utilizes direct piezoelectric effect to produce electric energy to the vibratory drive of big cymbals structure PZT (piezoelectric transducer) 3 by cantilever beam 1.And this cantilever beam 1 has the effect of amplifying extraneous mechanics excitation.This for example can bond on the upper surface and lower surface of cantilever beam 1 by materials such as bonding agents symmetrically to big cymbals structure PZT (piezoelectric transducer) 3.It can be the piezoelectricity disk to each big cymbals structure PZT (piezoelectric transducer) 3 by the piezoelectric 4(of centre) and two lip-deep two the big cymbals shape metal caps 5 up and down that lay respectively at this piezoelectric 4 form by material adhesives such as for example conducting resinls.Free-ended side at the close cantilever beam 1 of each big cymbals shape metal cap 5 is connected with lead 6, and the electric energy that each big cymbals structure PZT (piezoelectric transducer) produces can be by lead 6 outputs.This lead 6 can be by being welded to connect to big cymbals shape metal cap 5.The present invention comprises that also one is used for gripping the stiff end of pedestal 2, cantilever beam 1 and the fixed component of big cymbals structure PZT (piezoelectric transducer) 3.This fixed component for example can be " U " shape framework 7 in the present embodiment.This U-shaped framework 7 holds also stiff end and the big cymbals structure PZT (piezoelectric transducer) 3 of fixed pedestal 2, cantilever beam 1 towards the free-ended direction opening of cantilever beam 1, and wherein pedestal 2 embeds the bottom of being somebody's turn to do " U " shape framework 7.Adopt this framework can with the cantilever beam 1 big cymbals structure PZT (piezoelectric transducer) 3 that driven by this cantilever beam 1 of clamping together, in order to when cantilever beam 1 vibration, can pass to driven big cymbals structure PZT (piezoelectric transducer) 3 to pressure rapidly.
In addition, also be provided with the mass 8 with respective quality at the free end of cantilever beam 1, be used for regulating the resonance frequency of whole piezo-electric type energy harvester.Quality by changing this mass 8 and with respect to the position of cantilever beam 1 perhaps by changing the brachium of this cantilever beam 1, can be regulated resonance frequency easily, makes its realistic application demand.
In the present embodiment, this piezoelectric 4 can be selected conventional piezoelectric materials or novel piezoelectric monocrystal material, for example can select the PMNT monocrystal material for use, and this PMNT monocrystal material can adopt improved Bridgman method growth, be oriented to＜001 or＜110, component is 0.20≤x≤0.40.Adopt the large scale PMNT monocrystalline of improved Bridgman method growth, its uniformity and rate of finished products height, and this PMNT monocrystalline is＜001〉or＜110〉direction, component o'clock has best piezoelectric property in 0.20≤x≤0.40.Big cymbals shape metal cap 5 can adopt have high strength, the metal material of high rigidity, high conductivity, high resiliency, characteristics such as wear-resisting, corrosion-resistant makes, for example can adopt high resiliency beryllium-bronze band to process by for example methods such as line cutting or mould punching press and make.And can change size and the degree of depth of big cymbals shape metal cap 5, with change transducing performance, thereby be applicable to various needs.
PZT (piezoelectric transducer) shown in the present embodiment is big cymbals structure PZT (piezoelectric transducer), but also can adopt the PZT (piezoelectric transducer) with high-energy-density characteristic of other types.For example also can adopt have recessed big cymbals type structure, the curved PZT (piezoelectric transducer) of opening structure of " V " shapes such as crescent (Moonie) structure, drum organization, or the PZT (piezoelectric transducer) of warp architecture, the perhaps direct common chip type piezoelectric oscillator of employing.For example, when direct employing chip type piezoelectric oscillator with the mode symmetrical placement that is similar to the big cymbals structure in cantilever beam go up on two surfaces up and down the time, different with the d31 pattern of common cantilever beam PZT (piezoelectric transducer) applying piezoelectric oscillator, the PZT (piezoelectric transducer) of this composite construction is by the squeezing action of cantilever beam, mainly excite the d33 pattern of piezoelectric vibrator, usually the d33 of piezoelectric goes out much than d31 is big, therefore can produce more energy.Be similar to the big cymbals structure PZT (piezoelectric transducer) in the present embodiment, the PZT (piezoelectric transducer) of above-mentioned various structures also is adhered on the upper surface and lower surface of cantilever beam 1 respectively symmetrically, can take full advantage of cantilever beam with this and swing up and down middle tension stress and the compression that produces, improve the energy density of device.
By PMNT monocrystal material 4 and big cymbals shape metal cap 5 is bonding, and behind welding lead 6 on the big cymbals shape metal cap 5, formed the big cymbals structure PZT (piezoelectric transducer) 3 with power conversion function; By being fixedly attached to pedestal 2, cantilever beam 1 formed cantilever beam structure; By big cymbals structure PZT (piezoelectric transducer) 3 being bonded in respectively symmetrically on two surfaces up and down of cantilever beam 1; Use " U " shape framework 7 together fixing cantilever beam 1, pedestal 2 and big cymbals structure PZT (piezoelectric transducer) 3 then; Can regulate the mass 8 of resonance frequency the free end setting of cantilever beam 1 in addition, namely constitute the composite construction piezo-electric type energy harvester that the cantilever beam shown in the present embodiment 1 drives.
Composite construction piezo-electric type energy harvester of the present invention is composited by cantilever beam structure and the PZT (piezoelectric transducer) with the curved structure of " V " shape, by these two kinds of structures are learnt from other's strong points to offset one's weaknesses, has greatly promoted the development of piezoelectric energy collection technique.The curved novel piezoelectric energy harvester structures of opening the high-energy-density characteristic of structure PZT (piezoelectric transducer) of " V " shape such as this low resonant frequency characteristic that combines cantilever beam structure and big cymbals structure, can greatly reduce the resonance frequency of big cymbals structure, improve the energy density of cantilever beam structure.And the cantilever vibration of beam drives this PZT (piezoelectric transducer) work with " U " shape framework, can when cantilever beam vibrates, pass to driven PZT (piezoelectric transducer) to pressure rapidly, thereby can more effectively improve the performance of vibrational energy in this piezoelectric energy gatherer collection and the conversion environment.
Fig. 2 shows second embodiment of piezo-electric type energy harvester of the present invention, and wherein identical with the embodiment of Fig. 1 parts mark with same Reference numeral, and no longer are described in detail.Different with the described embodiment of Fig. 11, present embodiment shows the composite construction piezo-electric type energy harvester that comprises the laminated construction PZT (piezoelectric transducer) that is driven by cantilever beam.
As shown in Figure 2, present embodiment adopts two big cymbals structure PZT (piezoelectric transducer)s in two laminated construction PZT (piezoelectric transducer)s, the 13 difference alternate embodiments 1.Each laminated construction PZT (piezoelectric transducer) 13 can be made of multi-layer piezoelectric material layer 14 cementation laminateds.In the present embodiment, this laminated construction PZT (piezoelectric transducer) 13 is made of three layer of piezo-electric material layers, 14 cementation laminated, and is connected with lead 16 respectively in a free-ended side of the close cantilever beam 1 of the piezoelectric material layer of the top layer of this laminated construction PZT (piezoelectric transducer) 13 and bottom.
In embodiment 2, piezoelectric material layer 15 can be selected conventional piezoelectric materials or novel piezoelectric monocrystal material equally, and for the PZT piezoceramic material, we adopt piezoelectric property PZT5H series piezoelectric ceramic preferably.Laminated construction PZT (piezoelectric transducer) 13 is by constituting three layers of PZT5H piezoelectric ceramic cementation laminated.And be similar to embodiment 1, by welding lead 16 on this laminated construction PZT (piezoelectric transducer) 13; By being fixedly attached to pedestal 2, cantilever beam 1 formed cantilever beam structure; On two surfaces up and down that laminated construction PZT (piezoelectric transducer) 13 are bonded in cantilever beam 1 respectively; Use " U " shape framework 7 together fixing cantilever beam 1, pedestal 2 and laminated construction PZT (piezoelectric transducer) 13 then; Can regulate the mass 8 of resonance frequency the free end setting of cantilever beam 1 in addition, namely constitute the composite construction piezo-electric type energy harvester that the cantilever beam shown in the present embodiment 2 drives.
Should understand in piezo-electric type energy harvester of the present invention, the piezoelectric of PZT (piezoelectric transducer) can adopt all kinds of piezoelectric ceramic, piezoelectric crystal, and organic piezoelectric materials and leadless piezoelectric material material etc. is made.Be not limited to the described material of above-described embodiment, for example can adopt other piezoelectrics with high piezoelectric constant and high electromechanical coupling factor and dielectric constant, comprise piezoelectrics such as barium titanate, Kynoar.
Again, cantilever beam among the present invention both can be the common cantilever beam structure that does not have bonding piezoelectric as shown in embodiment, but also can be the function cantilever beam structure that is bonded with piezoelectric, for example can comprise at least one piezoelectric that is arranged on the cantilever beam 1, and be soldered to the lead on this piezoelectric.If adopt this function cantilever beam structure, then can increase the utilance of cantilever beam, and then improve the efficient that ambient vibration can be converted to electric energy effectively.Cantilever beam among the present invention can be made of various materials such as organic and inorganic and metal materials, by the resonance frequency that the selection of material parameters such as cantilever beam scantling, hardness, intensity can be regulated composite construction piezoelectricity energy collector, parameters such as power output and energy density.
In addition, the vibrational energy in the environment is after piezo-electric type energy harvester of the present invention is collected and is converted into electric energy, and by above-mentioned lead 6,16 outputs, this lead can link to each other with the storage circuit with rectification and energy accumulation function usually, so that circuit downstream is powered.This storage circuit can comprise rectification unit, filter unit usually, and comprises Storage Unit of energy-storage travelling wave tube etc.In addition, because the voltage that piezoelectric element generates is still very big after rectification usually, can not directly apply to lower powered load, also is not suitable for directly to battery storage, therefore can be a kind of available form with transformation of electrical energy by voltage conversion unit also, thereby satisfy the demand of types of applications occasion.
Composite construction piezo-electric type energy harvester of the present invention has following effect: by cantilever beam to external world mechanics excitation have amplification, can improve energy density and the power output of device; Have low resonant frequency, high-energy-density, the convenient adjustable characteristic of resonance frequency; Simple in structure, can be connected between the structure, electronic circuit module is easy for installation.
Composite construction piezo-electric type energy harvester of the present invention is widely used, can be widely used in collecting motor vibrations, building (bridge) vibration, wind energy and various vehicle travels, aircraft flight, the vibrational energy that human body walking etc. produce, electric energy is collected and be converted to this vibrational energy, thereby can make these equipment realize energy-autarchic to power supplies such as wireless sensor node, portable low power-consumption electronic products, solve problems such as its battery altering difficulty.
Claims (13)
1. a cantilever beam drives composite construction piezo-electric type energy harvester, comprising:
One cantilevered beam members, one end are the stiff end that is fixed to pedestal, and the other end is free end;
Respectively symmetrically in a pair of piezoelectric energy-conversion unit that upper surface and the lower surface of described cantilevered beam members are settled, described piezoelectric energy-conversion unit drives to produce electric energy by the vibration of described cantilevered beam members near the stiff end of described cantilevered beam members; And
The output unit that the electric energy that is used for producing is exported.
2. piezo-electric type energy harvester according to claim 1 is characterized in that, also comprises the fixed component of stiff end, pedestal and piezoelectric energy-conversion unit for the described cantilevered beam members of clamping.
3. piezo-electric type energy harvester according to claim 1, it is characterized in that, described piezoelectric energy-conversion unit is the piezoelectric energy-conversion unit with big cymbals shape structure, piezoelectric in the middle of comprising and be adhered to the upper surface of described piezoelectric respectively and the metal cap of two big cymbals shapes on the lower surface, described output unit comprise respectively the lead of drawing from a free-ended side of the close described cantilevered beam members of each metal cap.
4. piezo-electric type energy harvester according to claim 1, it is characterized in that, described piezoelectric energy-conversion unit is the piezoelectric energy-conversion unit with laminated construction, described laminated construction comprises the multi-layer piezoelectric material layer of cementation laminated, and described output unit comprises respectively the lead of drawing from a free-ended side of the close described cantilevered beam members of the piezoelectric material layer of the top layer of described laminated construction and bottom.
5. piezo-electric type energy harvester according to claim 1 is characterized in that, described piezoelectric energy-conversion unit is to have the curved piezoelectric energy-conversion unit of opening structure of the V-arrangement that comprises recessed big cymbals shape structure, crescent structure or drum organization.
6. piezo-electric type energy harvester according to claim 1 is characterized in that, described piezoelectric energy-conversion unit is the piezoelectric energy-conversion unit with warp architecture.
7. piezo-electric type energy harvester according to claim 1 is characterized in that, described piezoelectric energy-conversion unit is the chip type piezoelectric oscillator.
8. piezo-electric type energy harvester according to claim 2, it is characterized in that, described fixed component is the U-shaped framework, described U-shaped framework is towards the free-ended direction opening of described cantilevered beam members, hold and fix stiff end, pedestal and the piezoelectric energy-conversion unit of described cantilevered beam members, and described pedestal embeds the bottom of described U-shaped framework.
9. according to each described piezo-electric type energy harvester among the claim 1-8, it is characterized in that, also comprise the mass of the free end that is arranged at described cantilevered beam members.
10. according to each described piezo-electric type energy harvester among the claim 1-8, it is characterized in that, also comprise at least one piezoelectric that is arranged on the described cantilevered beam members, and be soldered to the lead on this piezoelectric.
11. according to claim 3 or 4 described piezo-electric type energy harvesters, it is characterized in that described piezoelectric is selected piezoelectric ceramic, piezoelectric crystal, organic piezoelectric materials or leadless piezoelectric material material for use.
12. piezo-electric type energy harvester according to claim 11 is characterized in that, described piezoelectric is for adopting the PMNT monocrystal material of improved Bridgman method growth, and its be oriented to＜001 or＜110, component is 0.20≤x≤0.40.
13. piezo-electric type energy harvester according to claim 11 is characterized in that, described piezoelectric is the PZT5H piezoelectric ceramic.
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| CN107061605A (en) * | 2017-03-31 | 2017-08-18 | 南京航空航天大学 | The inertia forcer of piezoelectric stack actuator driving |
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| CN107870350B (en) * | 2017-12-13 | 2023-12-15 | 中国地质大学（武汉） | Differential dual-piezoelectric-patch geophone core and piezoelectric geophone |
| CN108448935A (en) * | 2018-05-02 | 2018-08-24 | 南京邮电大学 | A kind of double class's circular arc type piezoelectric type energy collectors |
| CN108448935B (en) * | 2018-05-02 | 2024-05-14 | 南京邮电大学 | Double-order arc piezoelectric energy collector |
| CN108429489B (en) * | 2018-05-22 | 2024-01-23 | 北京中微融通科技有限公司 | Building vibration energy collecting device |
| CN108486990B (en) * | 2018-05-22 | 2024-01-19 | 北京中微融通科技有限公司 | Bridge vibration energy collecting anti-icing system based on piezoelectric element |
| CN108486990A (en) * | 2018-05-22 | 2018-09-04 | 北京中微融通科技有限公司 | Bridge vibration collection of energy ice protection system based on piezoelectric element |
| CN108429489A (en) * | 2018-05-22 | 2018-08-21 | 北京中微融通科技有限公司 | Vibration of building energy collecting device |
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| CN108964520A (en) * | 2018-07-20 | 2018-12-07 | 南方科技大学 | Energy collector |
| CN108964520B (en) * | 2018-07-20 | 2019-07-05 | 南方科技大学 | Energy collector |
| CN110696569A (en) * | 2019-10-24 | 2020-01-17 | 四川新马高科技有限公司 | Vehicle wheel hub temperature detection equipment and monitoring system |
| CN111313756B (en) * | 2020-03-30 | 2021-08-13 | 西安交通大学 | Mechanical rectification type piezoelectric cantilever beam vibration energy collector |
| CN111313756A (en) * | 2020-03-30 | 2020-06-19 | 西安交通大学 | Mechanical rectification type piezoelectric cantilever beam vibration energy collector |
| CN112468019A (en) * | 2020-11-19 | 2021-03-09 | 南通大学 | Road surface impact energy harvesting device and calculation method |
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