CN208548842U - One kind being based on multistable piezoelectric harvester - Google Patents
One kind being based on multistable piezoelectric harvester Download PDFInfo
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Abstract
The utility model discloses one kind to be based on multistable piezoelectric harvester, including main piezoelectric beam, it is bent piezoelectric beam and spring, the first piezoelectric patches is symmetrically adhesive in the upper and lower surface of main piezoelectric beam, the upper and lower surface of one end of direction bending piezoelectric beam bending section is symmetrically placed on main piezoelectric beam the first vibration magnet, its other end is overlapped on the top of spring, two first vibration magnet are heteropolar attracting state arrangement with opposite face, it is bent on the curved interior face of piezoelectric beam and is adhesive with the second piezoelectric patches, it is symmetrically placed on two end medial surfaces of bending piezoelectric beam to have the second vibration magnet, third piezoelectric patches is symmetrically adhesive on two terminal outboard surfaces, magnet and the first vibration magnet are vibrated using opposite face as homopolar-repulsion state arrangement positioned at the second of main piezoelectric beam side, and it is located at the second vibration magnet and the first vibration magnet of the main piezoelectric beam other side It is heteropolar attracting state arrangement with opposite face.Multistable design and the use generating efficiency of bending piezoelectric beam significantly improve in the utility model.
Description
Technical field
The utility model relates to power-saving technology and regenerated environment protecting field of new energy technologies, and in particular to one kind is based on multistable
Piezoelectric harvester, the random vibration machinery that can effectively collect ambient enviroment can be carried out power generation.
Background technique
Currently, most of low power devices (such as wireless sensor and transmitter, medical implanted sensor, portable electric
Sub- equipment) it is dependent on electrochemical cell power supply.But electrochemical cell is short, at high cost with the service life and handles old and useless battery band
The problems such as environmental pollution come, so researcher is just actively finding the new energy of one kind to replace electrochemical cell as low-power
Device power supply.
In addition, the continuous development of microelectric technique greatly reduces the energy consumption of low power devices, thus, from ambient enviroment
Energy is collected to drive low power devices to become more feasible.From ambient enviroment collectable energy mainly include solar energy,
Thermal energy and mechanical energy.Wherein, mechanical energy, especially vibrational energy are widely distributed in ambient enviroment.It is converted in mechanical energy to electric energy
Number of ways in, piezoelectric harvester has many advantages, such as that structure is simple, impedance is small, output electric current is big and be concerned.
But that there are environmental suitabilities is poor, generating efficiency is low, low frequency bad adaptability, unit for existing piezoelectricity oscillating generating set
The small defect of generated energy in time.
Utility model content
The purpose of the utility model is to overcome deficiencies in the prior art, propose a kind of based on multistable piezoelectricity prisoner
Energy device can more adapt to random, broadband, low frequency, small amplitude motion in environment, improve energy recovery efficiency.
In order to solve the above technical problems, the utility model provides one kind based on multistable piezoelectric harvester, feature
It is, including main piezoelectric beam, bending piezoelectric beam and spring that main piezoelectric beam is located at the one of the curved side of bending piezoelectric beam and main piezoelectric beam
The bending section of bending piezoelectric beam is directed toward at end, the first piezoelectric patches is symmetrically adhesive in the upper and lower surface of main piezoelectric beam, on main piezoelectric beam
The upper and lower surface of one end of direction bending piezoelectric beam bending section is symmetrically placed the first vibration magnet, and the other end is overlapped on spring
Top with spring vibration, two first vibration magnet are that heteropolar attracting state is arranged with opposite face, be bent the curved of piezoelectric beam
The second piezoelectric patches is adhesive on bent medial surface, being bent symmetrically placed on two end medial surfaces of piezoelectric beam has the second vibration magnetic
Iron, correspondingly, it is symmetrically adhesive with third piezoelectric patches on two terminal outboard surfaces, the second vibration magnetic positioned at main piezoelectric beam side
Iron and the first vibration magnet are located at the second vibration magnet of the main piezoelectric beam other side using opposite face as homopolar-repulsion state arrangement
Vibrating magnet with first with opposite face is heteropolar attracting state arrangement.
Preferably, spring resonant frequency and main piezoelectricity beam resonant frequency count relationship at double.
Preferably, the resonance frequency of spring and environmental excitation frequency are at multiple proportion.
Preferably, bending piezoelectric beam bending degree is less than 180 °.
Preferably, it uses and connects between the first piezoelectric patches of main piezoelectric beam upper surface and the first piezoelectric patches of lower surface
Or parallel-connection structure.
Preferably, serial or parallel connection structure is used between the second piezoelectric patches and third piezoelectric patches.
Preferably, the first piezoelectric patches, the second piezoelectric patches and third piezoelectric smart material are PZT series.
Preferably, it is bent piezoelectric beam and main piezoelectric beam material is elastic material.
Compared with prior art, the utility model beneficial effect achieved is:
1) on the one hand basic low amplitude value can be motivated using spring and carries out level-one amplification, to meet the humorous of main piezoelectric beam
Vibration frequency improves the output performance of energy collecting device；On the other hand design spring, main piezoelectric beam size with meet spring frequency with
Main piezoelectric beam frequency, the resonance frequency of spring and environmental frequencies are at multiple proportion, so that spring and main piezoelectric beam form resonance, bullet
Spring amplifies environment at multiple.
2) it is combined, on the one hand can be cooperatively formed with the first vibration magnet more with the second vibration magnet using bending piezoelectric beam
Form stable, to improve Oscillation Amplitude to improve generating efficiency；On the other hand the addition of bending piezoelectric beam not only will not influence
The generating effect of main piezoelectric beam, moreover it is possible to increase power generation approach on the original basis, increase generated energy.
3) structure that top half is repelled each other, lower half portion is attracting between magnet is vibrated using the second vibration magnet and first,
Ensure main piezoelectric beam and is bent the maximization of vibration of piezoelectric beam amplitude；It is formed simultaneously multistable configuration, improves generating efficiency.
4) bending piezoelectric beam bending degree is that inside is completely tight less than the adhesive method between 180 °, with the second piezoelectric patches
Patch, outside are divided into the top part and the bottom part centered on raised midpoint point pastes third piezoelectric patches, and guarantee piezoelectric patches initial bending amplitude is most
Smallization increases the service life of piezoelectric patches.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model piezoelectric harvester；
Fig. 2 is the main piezoelectric beam structural schematic diagram of the utility model piezoelectric harvester；
Fig. 3 is the bending piezoelectric beam of the utility model piezoelectric harvester and the structural schematic diagram of the second vibration magnet；
Fig. 4 is the structural schematic diagram of the bending piezoelectric beam of the utility model piezoelectric harvester；
Fig. 5 is that the low-frequency range vibration of the utility model piezoelectric harvester generates voltage and basic piezoelectric cantilever in the prior art
Beam vibration, traditional multistable piezoelectric cantilever generate voltage and compare waveform diagram；
Fig. 6 be the utility model piezoelectric harvester first vibration magnet and second vibration magnet between different distance to electricity
Pressure influences analogous diagram；
Fig. 7 is three kinds of typical ranges between the first vibration magnet of the utility model piezoelectric harvester and the second vibration magnet
To voltage influence analogous diagram；
Fig. 8 is that optimal distance emulates between the first vibration magnet of the utility model piezoelectric harvester and the second vibration magnet
Figure.
Appended drawing reference: 1, main piezoelectric beam；2, it is bent piezoelectric beam；3, the first piezoelectric patches；4, spring；5, the first vibration magnet；
6, the second vibration magnet；7, the second piezoelectric patches；8, third piezoelectric patches.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.Following embodiment is only used for clearly illustrating this
The technical solution of utility model, and cannot be used as a limitation the limitation protection scope of the utility model.
In the description of the utility model patent, it should be noted that the terms "include", "comprise" or its any other
Variant is intended to non-exclusive inclusion, in addition to comprising those of listed element, but also may include being not explicitly listed
Other element.
In the description of the utility model patent, it should be noted that term " center ", "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings,
It is merely for convenience of description the utility model patent and simplifies description, rather than the device or element of indication or suggestion meaning are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as the limitation to the utility model patent.This
Outside, term " first ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the utility model patent, it should be noted that unless otherwise clearly defined and limited, term
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State concrete meaning of the term in the utility model patent.
One kind of the utility model is based on multistable piezoelectric harvester, referring to FIG. 1 to FIG. 4, including main piezoelectric beam
1, it is bent piezoelectric beam 2 and spring 4, main piezoelectric beam 1 is located at the curved side of bending piezoelectric beam 2 and one end direction of main piezoelectric beam 1 is curved
The bending section of bent piezoelectric beam 2 is symmetrically adhesive with the first piezoelectric patches 3 in the upper and lower surface of main piezoelectric beam 1, is directed toward on main piezoelectric beam 1
The upper and lower surface of one end of bending 2 bending section of piezoelectric beam is symmetrically placed the first vibration magnet 5, and the other end is overlapped on spring 4
Top to be vibrated with spring 4, two first 5 magnet of vibration are that heteropolar attracting state is arranged with opposite face, are bent piezoelectric beam 2
The second piezoelectric patches 7 is adhesive on curved interior face, being bent symmetrically placed on two end medial surfaces of piezoelectric beam has the second vibration
Magnet 6, correspondingly, third piezoelectric patches 8 is symmetrically adhesive on two terminal outboard surfaces, positioned at the second of main 1 certain side of piezoelectric beam
Magnet 6 and the first vibration magnet 5 are vibrated using opposite face as homopolar-repulsion state arrangement, and are located at the second of the main piezoelectric beam other side
Magnet 6 and the first vibration magnet 5 are vibrated with opposite face for heteropolar attracting state arrangement.
Embodiment
The embodiment of the utility model piezoelectric harvester, shown in Figure 2, main piezoelectric beam 1 is horizontal positioned, main piezoelectric beam 1
Left end be directed toward the bending section of bending piezoelectric beam 2, the right end of main piezoelectric beam 1 is overlapped on the top of spring 4, and spring 4 is used to support
Main piezoelectric beam 1, and main piezoelectric beam 1 can be made as spring 4 is vibrated up and down, the upper and lower surface of main piezoelectric beam 1 is adhesive with
One piezoelectric patches 3 is placed with the first vibration magnet 5 above and below the left end of main piezoelectric beam 1, and two first vibration magnet 5 are heteropolar
Attracting state arrangement, the first vibration magnet 5 can also act as mass block, to reduce main 1 resonance frequency of piezoelectric beam.
First piezoelectric patches 3 extends only to be placed with the first vibration magnetic there is no the upper and lower surface for covering entire main piezoelectric beam 1
The place of iron 5, so that it is guaranteed that the first vibration magnet 5 will not cause to damage to the first piezoelectric patches 3.
First piezoelectric patches 3 of upper surface and the first piezoelectric patches 3 of lower surface use serial or parallel connection structure.
Serial or parallel connection structure refers to: if this two piezoelectric patches are pasted by identical polar, suitable two piezoelectric patches (electricity
Hold) series connection.The half that total capacitance is monolithic capacitor is exported, output charge is equal with monolithic charge, and output voltage is the two of monolithic
Times；If pasting by opposed polarity, suitable two piezoelectric patches (capacitor) are in parallel, and output capacitance is twice of single capacitor, and pole plate powers on
Lotus amount is twice of monolithic, but output voltage is equal with monolithic.Tandem energy obtains higher level output, and parallel connection can obtain lower
Internal resistance, in parallel or series connection depends on the device type connected below, high resistant input with series connection, input low-resistance with simultaneously
Connection.
It is shown in Figure 3, the curvature of piezoelectric beam 2 is bent less than 180 °, and the curved interior face of bending piezoelectric beam 2 is adhesive with
Second piezoelectric patches 7 is bent on the inside of two end bends of piezoelectric beam 2 and is adhesive with the second vibration magnet 6 respectively, is bent piezoelectric beam 2
Exterior portion is being adhesive with third piezoelectric patches 8 respectively above and below convex center certain distance at two parts, guarantee third with this
The initial bending amplitude of piezoelectric patches 8 is small；Serial or parallel connection structure is used between second piezoelectric patches 7 and third piezoelectric patches 8；Second vibration
Moving magnet 6 is fixed on bending 2 end of piezoelectric beam, the second vibration magnet 6 positioned at upper end and the first vibration magnet 5 positioned at upper end
Repel each other, the second vibration magnet 6 positioned at lower end and the first vibration magnet 5 positioned at lower end are attracting, guarantee that main piezoelectric beam 1 shakes in this way
The maximization of dynamic amplitude, also can guarantee the vibration of bending piezoelectric beam 2.
Second vibration magnet 6 is fixed on bending 2 upper and lower ends of piezoelectric beam, on the one hand combines and is formed with the first vibration magnet 5
Multistable form, on the other hand drives the deformation of bending 2 end of piezoelectric beam, to influence the vibration for being bent piezoelectric beam 2.
It is shown in Figure 4,2 bending degree of piezoelectric beam is bent less than 180 °, and the adhesive method between the second piezoelectric patches 7 is
Inside is completely close to, outside is divided into the top part and the bottom part centered on raised midpoint and point pastes third piezoelectric patches 8, can guarantee in this way
One, the minimum of the second piezoelectric patches initial bending amplitude, increases the service life of piezoelectric patches.
In the preferred embodiment in the utility model, the first, second, and third piezoelectric smart material is PZT series, is bent piezoelectric beam 2
It is elastic material, such as brass or stainless steel with main 1 material of piezoelectric beam, 4 material of spring is stainless steel series.
4 resonance frequency of spring and main 1 resonance frequency of piezoelectric beam are at multiple proportion, to reach resonance effect；While spring 4
Resonance frequency and environmental excitation frequency are at multiple proportion, it is ensured that the amplification effect of environmental frequencies.
The course of work of the utility model based on multistable piezoelectric harvester are as follows:
When there is vibration in external environment, extraneous vibration excitation generates upper and lower impact force to spring 4, and spring 4 occurs
Deformation drives main piezoelectric beam 1 to move up and down, and causing main piezoelectric beam 1, deformation occurs to make the first piezoelectric patches 3 generate deformation voltage；
First vibration magnet 5 of main 1 left end of piezoelectric beam moves up and down with main piezoelectric beam 1, drives to be located at and is bent the of 2 medial surface of piezoelectric beam
The vibration of two oscillating magnets 6 makes the second piezoelectric patches 7, third piezoelectric patches 8 generate shape to drive bending 2 deformation vibration of piezoelectric beam
Time variant voltage.The voltage that first piezoelectric patches, the second piezoelectric patches and third piezoelectric patches generate can be stored by piezoelectric energy converter
And it is converted into DC voltage, for the power supply of the devices such as sensor.
It is illustrated in figure 5 the vibration of the utility model low-frequency range and generates voltage and basic piezoelectric cantilever vibration in the prior art
Dynamic, traditional multistable piezoelectric cantilever generates voltage and compares waveform diagram.Wherein basic vibration in piezoelectric cantilever beam is referring to document piezoelectricity
The research [D] (Wang Xiaoyu Beijing Jiaotong University, 2009.) of cantilever beam power generator, traditional multistable piezoelectric cantilever referring to
Document Zhou S, Cao J, Inman D J, et al. Broadband tristable energy harvester:
Modeling and experiment verification[J]. Applied Energy, 2014, 133(1):33-39。
Made when the utility model actual experiment using the bending piezoelectric beam that long 60mm, the main piezoelectric beam of width 30mm and bending radius are 20mm
For experimental material.It can be seen from the figure that the voltage that multistable configuration vibrates generation between 0-20Hz is apparently higher than foundation beam vibration
The raw voltage of movable property, and frequency band is wider, environment-adapting ability is stronger；And this structure is due to the addition of bent beam, the voltage height of generation
In multistable configuration and frequency band it is wider.And in the frequency range for being higher than 20Hz, the voltage of generation is smaller, can ignore and not remember.Experiment card
Bright, this structural test works well.
As shown in Fig. 6, Fig. 7, Fig. 8, the influence of the first vibration magnet and the second vibration magnet initial distance to output voltage
It is very big, experiment proves that, optimal distance is 10mm between the two.And when distance is 8mm and 9mm, relative to other
Distance, output voltage are also higher；Relative to optimum distance 10mm, output voltage reduction amount is less.Therefore, this structure size designs
With fault-tolerance.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvements and modifications can also be made, these change
It also should be regarded as the protection scope of the utility model into modification.
Claims (8)
1. one kind is based on multistable piezoelectric harvester, characterized in that including main piezoelectric beam, bending piezoelectric beam and spring, main pressure
Electric beam is located at the curved side of bending piezoelectric beam and one end of main piezoelectric beam and is directed toward the bending section of bending piezoelectric beam, in main piezoelectric beam
Upper and lower surface is symmetrically adhesive with the first piezoelectric patches, and the upper and lower surface pair of one end of bending piezoelectric beam bending section is directed toward on main piezoelectric beam
Title is placed with the first vibration magnet, and the other end is overlapped on the top of spring with spring vibration, two first vibration magnet with
Opposite face is heteropolar attracting state arrangement, is bent on the curved interior face of piezoelectric beam and is adhesive with the second piezoelectric patches, is bent piezoelectric beam
Two end medial surfaces on it is symmetrically placed have the second vibration magnet, correspondingly, being symmetrically adhesive on two terminal outboard surfaces
Three piezoelectric patches vibrate magnet and the first vibration magnet using opposite face as homopolar-repulsion state positioned at the second of main piezoelectric beam side
Arrangement, and be located at the second vibration magnet of the main piezoelectric beam other side and first and vibrate magnet with opposite face for heteropolar attracting state cloth
It sets.
2. according to claim 1 a kind of based on multistable piezoelectric harvester, characterized in that spring resonant frequency and master
Piezoelectricity beam resonant frequency counts relationship at double.
A kind of be based on multistable piezoelectric harvester 3. according to claim 1, characterized in that the resonance frequency of spring with
Environmental excitation frequency is at multiple proportion.
4. according to claim 1 a kind of based on multistable piezoelectric harvester, characterized in that bending piezoelectricity beam deflection journey
Degree is less than 180 °.
5. according to claim 1 a kind of based on multistable piezoelectric harvester, characterized in that be located at table on main piezoelectric beam
Serial or parallel connection structure is used between first piezoelectric patches in face and the first piezoelectric patches of lower surface.
6. according to claim 1 a kind of based on multistable piezoelectric harvester, characterized in that the second piezoelectric patches and third
Serial or parallel connection structure is used between piezoelectric patches.
7. according to claim 1 a kind of based on multistable piezoelectric harvester, characterized in that the first piezoelectric patches, second
Piezoelectric patches and third piezoelectric smart material are PZT series.
8. according to claim 1 a kind of based on multistable piezoelectric harvester, characterized in that bending piezoelectric beam and main pressure
Electric beam material is elastic material.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934515A (en) * | 2020-09-16 | 2020-11-13 | 苏州大学 | Composite energy collecting device |
| CN113108682A (en) * | 2021-04-21 | 2021-07-13 | 吉林大学 | Piezoelectric actuator displacement measuring system and method combining magnetic field |
| CN113791698A (en) * | 2021-09-14 | 2021-12-14 | 哈尔滨工程大学 | Wireless mouse with combined type power generation facility |
-
2018
- 2018-08-01 CN CN201821228383.8U patent/CN208548842U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934515A (en) * | 2020-09-16 | 2020-11-13 | 苏州大学 | Composite energy collecting device |
| CN113108682A (en) * | 2021-04-21 | 2021-07-13 | 吉林大学 | Piezoelectric actuator displacement measuring system and method combining magnetic field |
| CN113108682B (en) * | 2021-04-21 | 2022-01-28 | 吉林大学 | Piezoelectric actuator displacement measuring system and method combining magnetic field |
| CN113791698A (en) * | 2021-09-14 | 2021-12-14 | 哈尔滨工程大学 | Wireless mouse with combined type power generation facility |
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