CN106953546B - A kind of swing ball formula simply supported beam piezoelectric energy collecting device - Google Patents
A kind of swing ball formula simply supported beam piezoelectric energy collecting device Download PDFInfo
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- CN106953546B CN106953546B CN201710299031.5A CN201710299031A CN106953546B CN 106953546 B CN106953546 B CN 106953546B CN 201710299031 A CN201710299031 A CN 201710299031A CN 106953546 B CN106953546 B CN 106953546B
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- 230000005284 excitation Effects 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 16
- 230000000694 effects Effects 0.000 claims description 5
- 229910000639 Spring steel Inorganic materials 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 3
- 238000003306 harvesting Methods 0.000 description 3
- 238000004377 microelectronic Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910018095 Ni-MH Inorganic materials 0.000 description 1
- 229910018477 Ni—MH Inorganic materials 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention discloses a kind of swing ball formula simply supported beam piezoelectric energy collecting devices.Including swing mechanism and babinet；Swing mechanism includes swing ball, swing rod, shaft and four Elastic simply-supported beams, and four Elastic simply-supported beam surfaces are equipped with piezoelectric element；Swing ball is connected to one end of swing rod, and the other end of swing rod is fixedly connected the middle part of shaft；The both sides of shaft are respectively fixedly connected with one end of two Elastic simply-supported beams；Swing ball is located at outside babinet, and shaft and Elastic simply-supported beam are located at box house；The both sides of shaft respectively set a pair of of clamping bar, and two pairs of clamping bars hold the other end of Elastic simply-supported beam respectively, and constraint position-limiting action is played in vertical direction to the other end of Elastic simply-supported beam；The present apparatus is operated in air or water environment, when swing ball, which experiences extraneous vibration excitation, to be swung, four Elastic simply-supported beams is driven to generate elastic bending deflection, piezoelectric element deforms upon and generates charge therewith.The configuration of the present invention is simple, it is highly practical, it can effectively collect the vibrational energy in environment.
Description
Technical field
The invention belongs to energy regenerating fields, use vibration piezoelectric energy switch technology, relate generally to a kind of swing ball formula
Simply supported beam piezoelectric energy collecting device.
Background technology
With the continuous development of wireless telecommunications and MEMS technology so that microelectronic chip, microsensor application range
Constantly expand, these equipment still rely upon traditional chemical cell to power mostly, such as Ni-MH battery, lithium polymer battery.It passes
The chemical cell restricted lifetime of system needs replacing either charge for being placed on awful weather or distant after a period of use
For the wireless sensor in remote area, this is a very serious restriction condition.Meanwhile largely environment can also be caused using battery
Harm.Therefore, energy collection technology becomes the emphasis studied both at home and abroad.
The vibration phenomenon common as nature, it is nearly ubiquitous and has higher energy density.Vibration pressure
Electric energy conversion technology have power density it is big, without startup power supply, do not generate heat, without electromagnetic interference, pollution-free, long lifespan, easily
In the processing and fabricating and the microminiaturization of implementation mechanism many advantages, such as, it is most widely used in vibration energy harvesting field.Such as cantilever
Beam type piezoelectric energy harvester, including the mass block of cantilever beam and cantilever beam end that is fixed on pedestal, following table on cantilever beam
Face is all pasted with piezoelectric ceramics.When work, cantilever beam is vibrated under the action of dynamic excitation and flexural deformation, while driving cantilever
The piezoelectric ceramics on beam surface deforms, and piezoelectric ceramics generates charge output under the action of alternate stress.This energy collecting device
Although simple in structure, working band is extremely narrow, and resonant frequency is higher.Vibration in natural environment is often that the random of low frequency swashs
It encourages, driving frequency is much smaller than the intrinsic frequency of cantilever beam itself, thus the Oscillation Amplitude of cantilever beam is smaller, piezoelectric material deflection
Small, generating efficiency is relatively low.Therefore, design a kind of small to vibrational excitation frequency dependence in environment, piezoelectric material deflection is big
Piezoelectric energy collecting device has larger meaning and value.
Invention content
In order to improve the low frequency characteristic of piezoelectric energy collecting device, general cantilever beam type piezoelectric energy collecting device is made up
The defects such as piezoelectric material deflection is small, and generating efficiency is low under low-frequency excitation, the present invention provides a kind of swing ball formula simply supported beam piezoelectricity
Energy collecting device.
A kind of swing ball formula simply supported beam piezoelectric energy collecting device includes swing mechanism and babinet 5, and the swing mechanism includes
Swing ball 1, swing rod 2, shaft 3 and four Elastic simply-supported beams 4, the surface of four Elastic simply-supported beams 4 are equipped with piezoelectric element；
The swing ball 1 is hollow ball or medicine ball, when working under air environment, 2 length of a diameter of swing rod of swing ball 1
1/8~1/4；When working in water, the 1/3~2/3 of 2 length of a diameter of swing rod of swing ball 1；
The length of the swing rod 2 is more than the length of the Elastic simply-supported beam 4, and 2 length of the swing rod is that the babinet is high
1~5 times of degree；
One end of the swing rod 2 is fixedly connected swing ball 1, and the other end is fixedly connected the middle part of shaft 3；The shaft 3
Both sides be respectively fixedly connected one end of two Elastic simply-supported beams 4, four Elastic simply-supported beams 4 are located in the same horizontal plane,
Two Elastic simply-supported beams 4 of the same side are mutually parallel；The swing ball 1 is located at outside babinet 5, the shaft 3 and Elastic simply-supported beam 4
Inside babinet 5, the both ends of shaft 3 are rotatablely connected babinet 5；Both sides are respectively provided with a pair of of clamping bar 7, two pairs of clamping bars 7 in babinet 5
The both sides of shaft 3 are mutually parallel and are located at, two pairs of clamping bars 7 hold the other end of Elastic simply-supported beam 4 respectively, to four bullets
Property simply supported beam 4 the other end vertical direction rise constraint position-limiting action；
When swing ball 1 is in extraneous vibrational excitation lower swing, four Elastic simply-supported beams 4 of 3 both sides of shaft is driven to generate elasticity
Flexural deformation, piezoelectric element deform upon and generate charge therewith, realize the output of electric energy.
The technical solution further limited is as follows：
The swing angle of the swing rod 2 is limited within ± 30 °.
The Elastic simply-supported beam 4 is lath-shaped, and the upper and lower surface of Elastic simply-supported beam 4 is equipped with piezoelectric element.
The material of the Elastic simply-supported beam 4 is spring steel or antifatigue elastic metallic.
The material of the babinet 5 is stainless steel or corrosion resistant alloy.
Two pairs of clamping bars 7 are equal with the distance between shaft 3, are the 2/3~3/4 of 4 length of simply supported beam.
The material of the piezoelectric element is Kynoar.
The advantageous effects of the present invention embody in the following areas：
1. the present invention is highly practical, has a wide range of application, can work in a variety of environment.It can be in river, lake or offshore place
Installation collects water body kinetic energy, it can also be used to which the vibration energy harvesting of mechanical structure, building structure etc. can not consume any fossil
The energy is that the microelectronic component of low-power consumption is adopted and can and be energized, and is a kind of environmentally friendly energy collecting device.
2. present invention employs simple beam structure, compared with the piezoelectric energy collecting device of general cantilever girder construction, outside
When boundary's driving frequency is far below the intrinsic frequency of beam itself, bending of the simply supported beam under rotating torque effect in apparatus of the present invention
Bending deformation quantity when deflection is than cantilever beam vibration is much bigger, and the deflection of piezoelectric material is also much bigger, generating efficiency
Higher.
3. the present invention is a kind of swing ball formula structure, experiences extraneous vibration excitation using swing ball and swung with driven fork, for letter
Strutbeam one end provides rotating torque.Compared with the length of simply supported beam, the length of swing rod is relatively long, as long as external environment is in swing ball
As soon as horizontal direction on act on smaller power, a sufficiently large rotating torque can be provided for simply supported beam, promote simply supported beam
Apparent flexural deformation is generated, the deflection of piezoelectric material is increased, improves generating efficiency.
Description of the drawings
Fig. 1 is the overall appearance figure of apparatus of the present invention.
Fig. 2 is the longitudinal section view of apparatus of the present invention.
Fig. 3 is the sectional elevation of apparatus of the present invention.
Fig. 4 be apparatus of the present invention in swing ball, shaft and simply supported beam structural schematic diagram.
Fig. 5 is longitudinal section view when swing ball is swung to the right in apparatus of the present invention.
Fig. 6 is the principle parameters definition graph of apparatus of the present invention.
Fig. 7 is the comparison diagram of cantilever beam end stress.
Fig. 8 is the longitudinal section view of solid racking device.
Serial number in upper figure：Swing ball 1, swing rod 2, shaft 3, simply supported beam 4, babinet 5, piezoelectric element 6, clamping bar 7.
Specific implementation mode
Below in conjunction with the accompanying drawings, the present invention is further described by embodiment.
Embodiment 1
Referring to Fig. 1 and Fig. 2, a kind of swing ball formula simply supported beam piezoelectric energy collecting device includes swing mechanism and babinet 5, babinet
5 height are 300mm, and material is stainless steel.Swing mechanism includes swing ball 1, swing rod 2, shaft 3 and four Elastic simply-supported beams 4, four
The upper and lower surface of Elastic simply-supported beam 4 is equipped with piezoelectric element 6, and the material of piezoelectric element 6 is Kynoar.Referring to Fig. 2, swing ball
1 is hollow ball, a diameter of 200mm.
Referring to Fig. 4 and Fig. 3,2 length of swing rod is 400mm, and one end of swing rod 2 is fixedly connected swing ball 1, and the other end, which is fixed, to be connected
The maximum deflection angle at the then middle part of shaft 3, swing rod 2 is ± 28 °.The both sides of shaft 3 are respectively fixedly connected with two elasticity
One end of simply supported beam 4, four Elastic simply-supported beams 4 are located in the same horizontal plane, and two Elastic simply-supported beams 4 of the same side are mutually flat
Row；Elastic simply-supported beam 4 is lath-shaped, and length 370mm, material is spring steel；The upper and lower surface of Elastic simply-supported beam 4 is equipped with pressure
Electric device.Swing ball 1 is located at outside babinet 5, and shaft 3 and Elastic simply-supported beam 4 are located inside babinet 5, the both ends rotation connection of shaft 3
Babinet 5.Both sides are respectively equipped with a pair of of clamping bar 7 in babinet 5, and two pairs of clamping bars 7 are mutually parallel and are located at the both sides of shaft 3,
Two pairs of clamping bars 7 hold the other end of Elastic simply-supported beam 4 respectively, are risen in vertical direction to the other end of four Elastic simply-supported beams 4
Constrain position-limiting action.
Two pairs of clamping bars 7 are equal with the distance between shaft 3, and are 255mm.
Referring to Fig. 5, when work, babinet 5 is fixed on the bottom in river or lake, swing ball 1 hollow at this time by flow and
The effect of buoyancy and swing to the right, while being rotated in the clockwise direction with driven fork 2 and shaft 3, this is just Elastic simply-supported beam 4
One end provides a turning moment.The other end of Elastic simply-supported beam 4 is constrained in vertical direction by clamping bar 7 and is limited, elastic freely-supported
The piezoelectric element 6 of beam flexural deformation under moment loading, 4 surface of Elastic simply-supported beam deforms upon and generates charge therewith, realizes
Electric energy exports.
Referring to Fig. 6, the distance L=500mm at the center of swing ball 1 to shaft 3, shaft 3 arrives the distance l=255mm, l of clamping bar 7
The as effective length of Elastic simply-supported beam, it is clear that L is more than l, takes k=L/l ≈ 1.96.One is acted on swing ball 1 to hang down with swing rod 2
Straight size is the power of F, and the torque size that F is generated at shaft 3 is M1, then have M1=FL=kFl.According to material power
Related content is learned it is found that torque M1The maximal bending moment generated inside Elastic simply-supported beam 4 is located at 4 root of Elastic simply-supported beam i.e. shaft
At 3, maximal bending moment Mmax1=M1, the maximum (normal) stress that 4 inside moment of flexure of Elastic simply-supported beam generates is：
W in formula (1)1It is only related with the cross-sectional geometry of Elastic simply-supported beam for the bending resistant section coefficient of Elastic simply-supported beam.
Referring to Fig. 7, for traditional cantilever piezoelectric energy collecting device, it is in l, with Fig. 6 to take the length of cantilever beam
The effective length of Elastic simply-supported beam 4 is equal, and the cross sectional shape of the cross sectional shape of cantilever beam and Elastic simply-supported beam in Fig. 64 also phase
Together.Also it is the power of the vertical direction of F in one size of cantilever beam end effect.The torque size that power F is generated in cantilever beam root
For M2, then have M2=Fl.According to mechanics of materials related content it is found that the maximal bending moments that are generated inside cantilever beam of power F be located at it is outstanding
The root of arm beam, Mmax2=M2, the maximum (normal) stress that moment of flexure generates inside cantilever beam is：
W in formula (2)2It is only related with the cross-sectional geometry of cantilever beam for the bending resistant section coefficient of cantilever beam.
Contrast (1), formula (2) can obtain, with equal length, identical cross-section (W1=W2) cantilever beam compare, in phase
Under the action of the vertical external force F of size, the maximum (normal) stress σ of Elastic simply-supported beam 4 in apparatus of the present inventionmax1It is cantilever beam maximum
Direct stress σmax2K times (i.e. 1.96 times).Therefore, the piezoelectric element 6 on 4 surface of Elastic simply-supported beam can obtain nearly twice of change
Shape amount can generate more charges under the action of alternate stress, to effectively increase the generating efficiency of device.
Embodiment 2
Referring to Fig. 8, in the present embodiment, swing ball 1 is the medicine ball of diameter 100mm, and the working environment of device is in air.
Other structures are with embodiment 1, and operation principle is the same as embodiment 1.
The present invention is highly practical, has a wide range of application, can work in a variety of environment.It can pacify in river, lake or offshore place
Dress collects water body kinetic energy, it can also be used to which the vibration energy harvesting of mechanical structure, building structure etc. can not consume any fossil energy
Source is that the microelectronic component of low-power consumption is adopted and can and be energized, and is a kind of environmentally friendly energy collecting device.
Claims (7)
1. a kind of swing ball formula simply supported beam piezoelectric energy collecting device, it is characterised in that：Including swing mechanism and babinet（5）, described
Swing mechanism includes swing ball（1）, swing rod（2）, shaft（3）With four Elastic simply-supported beams（4）, four Elastic simply-supported beams（4）Table
Face is equipped with piezoelectric element；
The swing ball（1）For hollow ball or medicine ball, when working under air environment, swing ball（1）A diameter of swing rod（2）Length
1/8~1/4；When working in water, swing ball（1）A diameter of swing rod（2）The 1/3~2/3 of length；
The swing rod（2）Length be more than the Elastic simply-supported beam（4）Length, and the swing rod（2）Length is the babinet
1~5 times of height；
The swing rod（2）One end be fixedly connected swing ball（1）, the other end is fixedly connected shaft（3）Middle part；The shaft
（3）Both sides be respectively fixedly connected two Elastic simply-supported beams（4）One end, four Elastic simply-supported beams（4）Positioned at same water
In plane, two Elastic simply-supported beams of the same side（4）It is mutually parallel；The swing ball（1）Positioned at babinet（5）Outside, the shaft
（3）And Elastic simply-supported beam（4）Positioned at babinet（5）Inside, shaft（3）Both ends be rotatablely connected babinet（5）；Babinet（5）Interior two
Side is respectively provided with a pair of of clamping bar（7）, two pairs of clamping bars（7）It is mutually parallel and is located at shaft（3）Both sides, two pairs of clamping bars（7）Point
Elastic simply-supported beam is not hold（4）The other end, to four Elastic simply-supported beams（4）The other end vertical direction rise constraint limit
Effect；
Work as swing ball（1）In extraneous vibrational excitation lower swing, shaft is driven（3）Four Elastic simply-supported beams of both sides（4）Generate bullet
Property flexural deformation, piezoelectric element deform upon and generate charge, realize the output of electric energy therewith.
2. a kind of swing ball formula simply supported beam piezoelectric energy collecting device according to claim 1, it is characterised in that：The swing rod
（2）Swing angle be limited within ± 30 °.
3. a kind of swing ball formula simply supported beam piezoelectric energy collecting device according to claim 1, it is characterised in that：The elasticity
Simply supported beam（4）For lath-shaped, Elastic simply-supported beam（4）Upper and lower surface be equipped with piezoelectric element.
4. a kind of swing ball formula simply supported beam piezoelectric energy collecting device according to claim 1 or 3, it is characterised in that：It is described
Elastic simply-supported beam（4）Material be spring steel.
5. a kind of swing ball formula simply supported beam piezoelectric energy collecting device according to claim 1, it is characterised in that：The babinet
（5）Material be stainless steel or corrosion resistant alloy.
6. a kind of swing ball formula simply supported beam piezoelectric energy collecting device according to claim 1, it is characterised in that：Described two pairs
Clamping bar（7）With shaft（3）The distance between it is equal, be Elastic simply-supported beam（4）The 2/3~3/4 of length.
7. a kind of swing ball formula simply supported beam piezoelectric energy collecting device according to claim 1, it is characterised in that：The piezoelectricity
The material of element is Kynoar.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103166504A (en) * | 2013-04-03 | 2013-06-19 | 重庆大学 | Impact micro-energy harvesting array structure |
| JP2014110674A (en) * | 2012-11-30 | 2014-06-12 | Hayami Kohei | Power generation system |
| KR20150068110A (en) * | 2013-12-11 | 2015-06-19 | 에스티엑스조선해양 주식회사 | Device for harvesting vibration energy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014110674A (en) * | 2012-11-30 | 2014-06-12 | Hayami Kohei | Power generation system |
| CN103166504A (en) * | 2013-04-03 | 2013-06-19 | 重庆大学 | Impact micro-energy harvesting array structure |
| KR20150068110A (en) * | 2013-12-11 | 2015-06-19 | 에스티엑스조선해양 주식회사 | Device for harvesting vibration energy |
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