CN205693581U - Piezoelectric energy collecting device - Google Patents
Piezoelectric energy collecting device Download PDFInfo
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- CN205693581U CN205693581U CN201620513676.5U CN201620513676U CN205693581U CN 205693581 U CN205693581 U CN 205693581U CN 201620513676 U CN201620513676 U CN 201620513676U CN 205693581 U CN205693581 U CN 205693581U
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- energy collecting
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Abstract
The open a kind of piezoelectric energy collecting device of this utility model, including pedestal, cantilever, piezoelectric and mass, described piezoelectric is arranged in the one side of described cantilever, one end of described cantilever is fixed on described pedestal, fixing a described mass on the two sides of the other end of described cantilever respectively, two described masses dock formation closed-loop structure up and down.This piezoelectric energy collecting device can improve the utilization ratio of piezoelectric, improve response frequency bandwidth thus improve efficiency of energy collection.
Description
Technical field
This utility model relates to a kind of energy collecting device, particularly relates to a kind of piezoelectric energy collecting device.
Background technology
Along with the application of low-power wireless sensor and portable set is more and more extensive, battery functi on highlights many
Shortcoming, such as the life-span with energy density is limited, change troublesome maintenance, pollute environment etc..And piezoelectric energy collecting device is as one
Novel miniature energy collection device, its have simple in construction, caloric value little, without electromagnetic interference, be prone to processing and fabricating, wiper ring
The advantages such as guarantor.Traditional piezoelectric energy collecting device 100 uses Piezoelectric Cantilever Beams, and as shown in Figure 1a, it is mainly by rectangle
Cantilever 101, mass 102, piezoelectric 103 and pedestal 104 form, and the fixing end of cantilever 101 is fixed on pedestal 104, from
Being provided with mass 102 by end, piezoelectric 103 is arranged on the fixing end of cantilever 101, and extraneous vibration is transmitted by pedestal 104
On cantilever 101 thus cause piezoelectric 103 to deform, then produce electric energy by piezoelectric effect.
But, there is some problems in said structure, such as, when structural vibration, cantilever 101 is maximum in the strain of fixing end,
Minimum in the strain of free end, from fixing end to free end on the length direction of cantilever 101, the size variation amplitude of strain
Greatly, as shown in Figure 1 b.When the stress of the fixing end of cantilever 101 reaches the limiting range of stress of piezoelectric 103, piezoelectric 103
The other end be but far from reaching capacity, therefore piezoelectric 103 is not fully exploited.It addition, above-mentioned traditional device
Only under characteristic frequency is vibrated, (eigentone of energy collecting device) just can collect the electric energy of higher-wattage, if partially
From this frequency, device is collected the ability of energy and is then declined to a great extent, as illustrated in figure 1 c, so outside driving frequency is limited by this structure
Bigger.
It would therefore be highly desirable to the piezoelectric energy collecting device of a kind of improvement, to overcome drawbacks described above.
Utility model content
The purpose of this utility model is to provide a kind of piezoelectric energy collecting device, and it can improve the utilization effect of piezoelectric
Rate, improve response frequency bandwidth thus improve efficiency of energy collection.
For achieving the above object, this utility model piezoelectric energy collecting device, including pedestal, cantilever, piezoelectric and
Mass, described piezoelectric is arranged in the one side of described cantilever, and one end of described cantilever is fixed on described pedestal, described
Fixing a described mass on the two sides of the other end of cantilever respectively, two described masses dock formation closed loop knot up and down
Structure.
Compared with prior art, due to this utility model piezoelectric energy collecting device cantilever the other end two sides on point
Not fixing a mass, two masses dock formation closed-loop structure up and down, and therefore the mass of this closed-loop structure is at cantilever
Structrural build up revolving mode homogenizes the stress distribution on cantilever beam length direction so that the utilization ratio of piezoelectric
It is greatly improved.And the revolving mode of the mass of this closed-loop structure formation and swing mode are close so that external drive frequency
Time between device revolving mode and swing mode, energy collecting device all can get the output of preferable voltage, reaches wide band
Purpose.
It is preferred that wherein mass described in is inverted U-shaped, another described mass takes the shape of the letter U, and described in two, mass is the most right
Connect the described closed-loop structure of formation.
It is preferred that each described mass has a horizontal part and vertically extending from the two ends of described horizontal part respectively
Vertical portion.
It is preferred that described piezoelectric is fixed on described cantilever one end near described pedestal.
It is preferred that described piezoelectric and described cantilever are rectangle sheet material.
It is preferred that multiple described cantilevers are fixed on described pedestal, each described cantilever is provided with the described of correspondence
Piezoelectric, described cantilever and described piezoelectric are positioned at described closed-loop structure.
By description below and combine accompanying drawing, this utility model will become more fully apparent, and these accompanying drawings are used for explaining this
The embodiment of utility model.
Accompanying drawing explanation
Fig. 1 a is the structure chart of traditional piezoelectric energy collecting device.
Fig. 1 b is the strain curve figure of the cantilever of traditional piezoelectric energy collecting device.
Fig. 1 c is the output voltage response curve with environmental frequencies of traditional piezoelectric energy collecting device.
Fig. 2 a is the structure chart of the first embodiment of this utility model piezoelectric energy collecting device.
Fig. 2 b is the strain curve figure of the cantilever of the piezoelectric energy collecting device of Fig. 2 a.
Fig. 2 c is the output voltage response curve with environmental frequencies of the piezoelectric energy collecting device of Fig. 2 a.
Fig. 3 a is that the strain of the cantilever of this utility model piezoelectric energy collecting device and conventional piezoelectric energy collecting device is bent
Line comparison diagram.
Fig. 3 b is this utility model piezoelectric energy collecting device and the output voltage of conventional piezoelectric energy collecting device and ring
The response curve comparison diagram of border frequency.
Fig. 4 a is the axonometric chart of the second embodiment of this utility model piezoelectric energy collecting device.
Fig. 4 b is the exploded view of Fig. 4 a.
Detailed description of the invention
Illustrate the several different most preferred embodiment of this utility model, wherein identical in different figures mark below with reference to the accompanying drawings
Number represent identical parts.As it has been described above, essence of the present utility model is a kind of piezoelectric energy collecting device, it can improve pressure
The utilization ratio of electric material, improve response frequency bandwidth thus improve efficiency of energy collection.
Fig. 1 a illustrates the first embodiment of this utility model piezoelectric energy collecting device 200, and this piezoelectric energy collects dress
Put 200 and include pedestal 201, cantilever 202, piezoelectric 203 and mass 204.Wherein, piezoelectric 203 is arranged on cantilever
In the one side of two 202, one end of cantilever 202 is fixed on pedestal 201, and the two sides of the other end of cantilever 202 is fixed one respectively
Individual mass 204, two mass about 204 docking form closed-loop structure.
Specifically, piezoelectric 203 is fixed on cantilever 202 one end near pedestal 201, and extraneous vibration passes through pedestal 201
It is delivered on cantilever 202.Two masses 204 and piezoelectric 203 and cantilever 202 together constitute with Piezoelectric Cantilever Beams.
Cantilever 202 and piezoelectric 203 are rectangle sheet material, it is preferred that two masses 204 are connected to the upper of cantilever 202
Lower surface, and do not contact piezoelectric 203.
It is preferred that piezoelectric 203 is lead zirconate titanate (PZT), the material of cantilever 202 is titanium (Ti), the material of pedestal 201
For rustless steel or aluminum, the material of mass 204 is copper.
In a preferred embodiment, two masses 204 are in closed-loop structure.As shown in Figure 2 a, wherein a mass 204a in
Inverted U-shaped, another mass 204b takes the shape of the letter U, and two mass 204a, 204b dock formation closed-loop structure up and down.Wherein, mass
204a has horizontal part 214 and respectively from vertically extending vertical portion, the two ends of horizontal part 214 215.And, mass 204a
Quality be mainly distributed on two vertical portions 215, the quality of horizontal part 214 is little compared with vertical portion 215.Another mass 204b's
Structure is consistent, is not repeated herein.As it can be seen, the corresponding vertical portion of two masses is mutually butted, formation closed-loop structure, and cantilever
202 and piezoelectric 203 be positioned at closed-loop structure.Said structure based on the present embodiment, choosing acceleration of vibration is 2.3m/
s2, utilize ANSYS to emulate, observe the electromotive force on piezoelectric 203 surface and the strain of cantilever 202, draw piezoresistive material respectively
The frequency response curve of material output voltage and the device cantilever when response frequency occurs resonance pastes answering of piezoelectric part
Become distribution curve, as shown in Fig. 2 c and 2b.Understood by the comparison diagram of Fig. 3 a, 3b, compare traditional piezoelectric energy collecting device
100 (dashed curves), the present embodiment (block curve) cantilever pastes the strain uniformity of piezoelectric part have been had and has significantly carried
Height, is greatly improved the utilization ratio of piezoelectric；In the case of suffered extraneous vibration acceleration reduces, environmental frequencies exists
Time between 6Hz～30Hz, the voltage of output is superior to traditional piezoelectric energy collecting device 100, environmental frequencies at 30Hz～
Time between 47Hz, voltage and traditional piezoelectric energy collecting device 100 of output are equal.As can be seen here, the piezoelectricity of the present embodiment
The operational frequency bandwidth of collection device 200 is significantly better than the operational frequency bandwidth of traditional piezoelectric energy collecting device 100.
Work process of the present utility model is: when the vibration of external environment is delivered on cantilever beam structure by pedestal 201
Time, the resonant frequency of frequency of vibration and cantilever 202 close to time, cantilever 202 can occur resonance so that is covered in piezoresistive material thereon
Material 203 deformation the most therewith, thus produce piezoelectric effect and generate electricity.Owing to the mass 204 of closed-loop structure is at cantilever beam structure
The revolving mode of upper formation homogenizes the stress distribution on cantilever beam length direction so that the utilization ratio of piezoelectric 203
It is greatly improved.And the revolving mode of the mass 204 of this closed-loop structure formation and swing mode are close so that external drive frequency
When rate is between device revolving mode and swing mode, energy collecting device all can get the output of preferable voltage, reaches broadband
Purpose.
Fig. 4 a, 4b illustrate the second embodiment of this utility model piezoelectric energy collecting device 300.In order to increase device
Collect power, the cantilever beam structure in multiple first embodiments can be arranged in an array manner, as shown in Figure 4 b, multiple outstanding
One end of arm 302 links together and is fixed on pedestal 301, and the other end is free end, overall in comb shape, multiple piezoelectrics
303 are separately fixed on each comb tooth of cantilever 302, are connected by wiring board 305 and are conducting in external circuit simultaneously.Two pieces
U-shaped mass 304 is separately fixed at the upper and lower surface of outstanding 302 comb tooth free ends, forms closed-loop structure, this cantilever 302 and piezoelectricity
Material 303 is positioned at closed-loop structure.Piezoelectric 303, cantilever 302 and mass 304 together constitute with piezoelectric cantilever array junctions
Structure.It is noted that the structure of mass 304 in the present embodiment is roughly the same with first embodiment, only size, big
Little slightly different.Closed-loop structure can play the effect such as first embodiment equally, it may be assumed that the rotation formed on cantilever beam structure
Mode homogenizes the stress distribution on cantilever beam length direction so that the utilization ratio of piezoelectric 303 is greatly improved, and
Revolving mode and swing mode that the mass 304 of this closed-loop structure is formed are close so that external drive frequency rotates at device
Time between mode and swing mode, energy collecting device all can get the output of preferable voltage, reaches wide band purpose.It addition,
The structure manufacturing process of the piezoelectric energy collecting device of the present embodiment is simple, with low cost.
Alternatively, the shape of mass 204/304 can be C-shaped, is not restricted by, as long as on two masses 204/304
Under connect formation closed-loop structure.
Above disclosed only preferred embodiment of the present utility model, can not limit this practicality with this new certainly
The interest field of type, the equivalent variations therefore made according to this utility model claim, still belong to this utility model and contained
Scope.
Claims (6)
1. a piezoelectric energy collecting device, including pedestal, cantilever, piezoelectric and mass, it is characterised in that: described pressure
Electric material is arranged in the one side of described cantilever, and one end of described cantilever is fixed on described pedestal, the other end of described cantilever
Two sides on fix a described mass respectively, two described masses dock formation closed-loop structure up and down.
2. piezoelectric energy collecting device as claimed in claim 1, it is characterised in that: wherein mass described in is inverted U-shaped, separately
Described in one, mass takes the shape of the letter U, and mass described in two docks the described closed-loop structure of formation up and down.
3. piezoelectric energy collecting device as claimed in claim 1, it is characterised in that: each described mass has a horizontal part
And respectively from vertically extending vertical portion, the two ends of described horizontal part.
4. piezoelectric energy collecting device as claimed in claim 1, it is characterised in that: described piezoelectric is fixed on described cantilever
One end near described pedestal.
5. piezoelectric energy collecting device as claimed in claim 1, it is characterised in that: described piezoelectric and described cantilever are for long
Square sheet material.
6. piezoelectric energy collecting device as claimed in claim 1, it is characterised in that: multiple described cantilevers are fixed on described pedestal
On, each described cantilever is provided with correspondence described piezoelectric, described cantilever and described piezoelectric be positioned at described in close
In ring structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620513676.5U CN205693581U (en) | 2016-05-30 | 2016-05-30 | Piezoelectric energy collecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620513676.5U CN205693581U (en) | 2016-05-30 | 2016-05-30 | Piezoelectric energy collecting device |
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| CN205693581U true CN205693581U (en) | 2016-11-16 |
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| CN201620513676.5U Active CN205693581U (en) | 2016-05-30 | 2016-05-30 | Piezoelectric energy collecting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106966356A (en) * | 2017-03-31 | 2017-07-21 | 中北大学 | A kind of beam type diaphragm pressure electrification structure |
| CN110572076A (en) * | 2019-09-02 | 2019-12-13 | 西安电子科技大学 | Multi-direction piezoelectric vibration energy collecting device |
-
2016
- 2016-05-30 CN CN201620513676.5U patent/CN205693581U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106966356A (en) * | 2017-03-31 | 2017-07-21 | 中北大学 | A kind of beam type diaphragm pressure electrification structure |
| CN110572076A (en) * | 2019-09-02 | 2019-12-13 | 西安电子科技大学 | Multi-direction piezoelectric vibration energy collecting device |
| CN110572076B (en) * | 2019-09-02 | 2021-06-08 | 西安电子科技大学 | Multi-direction piezoelectric vibration energy collecting device |
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