CN207490793U - A kind of collision raising frequency formula bistable state piezoelectric harvester - Google Patents
A kind of collision raising frequency formula bistable state piezoelectric harvester Download PDFInfo
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- CN207490793U CN207490793U CN201721589834.6U CN201721589834U CN207490793U CN 207490793 U CN207490793 U CN 207490793U CN 201721589834 U CN201721589834 U CN 201721589834U CN 207490793 U CN207490793 U CN 207490793U
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Abstract
The utility model discloses a kind of collision raising frequency formula bistable state piezoelectric harvesters.Human motion frequency is low, and Conventional piezoelectric energy accumulator intrinsic frequency is high, and output power is low.The pendulum mound of the utility model is fixed in shaft, and pendulum mound embeds one block of magnet；Circular ring shape housing interior side-wall is fixed with symmetrical two plectrum groups；Plectrum group includes the three pieces plectrum of circumferentially equidistant arrangement；A piezoelectric beam is equipped with between the every adjacent two panels plectrum of plectrum group；One block of magnet is fixed in circular ring shape housing interior side-wall bottom position, the magnetic pole that two magnet are held in opposite directions is identical.The pendulum mound of the utility model introduces bistable structure by coupling magneticaction, slightly swing or two potential wells between substantially period or substantially chaotic motion state are in the case where low frequency swings excitation at random in a potential well, piezoelectric beam is collided with plectrum, realize up-conversion, human body swing can be converted to electric energy, and improve generating efficiency.
Description
Technical field
The utility model is related to energy collecting devices, and in particular to collect the collision raising frequency formula bistable state pressure that human body swings energy
Electric energy accumulator.
Background technology
In recent years, portable electronic device, MEMS and wireless sensor network were in civilian, military, medical and work
It is used widely in industry production.Especially at civilian aspect, substantially through the daily life of most people.It is most of at present
For microelectronic product for the energy all still traditional batteries, this also forces user must be periodically to equipment charge.Human body is transported in fact
There is a large amount of movement energy, such as the swing of body when dynamic, these swings with vibration energy accumulator can be collected, converted
For the electric energy needed for equipment.Piezoelectric material can reach higher energy conversion efficiency because the electromechanical coupling factor of itself is high, because
This, is widely used in vibration energy harvesting.But because human motion frequency is low, Conventional piezoelectric energy accumulator intrinsic frequency is high, and prisoner can frequency band
It is narrow, cause output power low.
Invention content
Prisoner's energy efficiency in the case where human body random low-frequency swings environment is low for piezoelectric harvester for the purpose of this utility model
Problem proposes a kind of efficient collision raising frequency formula bistable state piezoelectric harvester.
The utility model solves technical problem and adopts the technical scheme that：
The utility model is made of plectrum, piezoelectric beam, pendulum mound, shaft, magnet and circular housing pedestal；The circle is outer
Shell pedestal includes integrally formed circular ring shape shell and cup dolly；Shaft is coaxially disposed with cup dolly, and shaft and circle
Pedestal forms revolute pair.The pendulum mound includes integrally formed first semicolumn and the second semicolumn, and the half of the first semicolumn
Diameter is bigger 2~4mm than shaft radius, the small 4~6mm of internal diameter of the radius ratio circular ring shape shell of the second semicolumn；During pendulum mound opens up
Heart hole half is located on the first semicolumn, the other half is located on the second semicolumn；The centre bore of pendulum mound is fixed in shaft, and second
A circular hole is opened up on the cylinder of semicolumn, the central axis of circular hole is located on the plane of symmetry of the second semicolumn；Circular hole embeds one
Block magnet.Circular ring shape housing interior side-wall is fixed with symmetrically arranged two plectrum groups；The plectrum group is included along shaft circumferential direction
The three pieces plectrum equidistantly arranged is β with a central angle folded by the adjacent plectrum of plectrum group, β values between 20~45 °；Plectrum
The plectrum side horizontal setting in centre position in group；At the top of two plectrum groups and central angle folded by two panels plectrum that bottom is nearest is equal
For 180 ° of -2 β；A piezoelectric beam is equipped with between the every adjacent two panels plectrum of plectrum group；With corresponding two piezoelectricity of plectrum group
Central angle folded by beam is β, and in the corresponding piezoelectric beam of different plectrum groups, it is 180 ° to have central angle folded by two piezoelectric beams.Plectrum
It is corresponding with respect to the axial position of shaft with piezoelectric beam with respect to the axial position of shaft；Shaft in the radial direction, plectrum and shaft axis
The distance of the heart is less than the distance of piezoelectric beam outer end end face and rotating shaft core；One piece is fixed in circular ring shape housing interior side-wall bottom position
Magnet, the magnet on the second semicolumn are identical with the magnetic pole that the magnet on the inside of circular ring shape shell is held in opposite directions；During original state, pendulum mound
Center of gravity and the angle of rotating shaft core line and vertical plane are α/2, α=β-k, the k value between 0.5~2 °.
α according to the spacing of the magnet size on the second semicolumn, the magnet size on the inside of circular ring shape shell, two blocks of magnet with
And the magnetic induction intensity of two blocks of magnet is adjusted.
The utility model has the advantage that：
Pendulum mound introduces bistable structure by coupling magneticaction, makes it in the case where low frequency swings excitation at random in a gesture
Slightly substantially period or substantially chaotic motion state between swing or two potential wells, piezoelectric beam are collided with plectrum in trap, are realized and are risen
Frequency is converted, and human body swing can be converted to electric energy, and improve generating efficiency.
Description of the drawings
Floor map when Fig. 1 is first equipoise of the utility model；
Floor map when Fig. 2 is second equipoise of the utility model；
Fig. 3 is the stereogram of the utility model；
Fig. 4 is signal when magnet axis is overlapped with circular ring shape outer casing inner wall magnet axis in pendulum mound in the utility model
Figure；
Fig. 5 is the structural perspective of pendulum mound in the utility model；
Fig. 6 is magnet on the inside of the potential energy circular ring shape shell opposite with magnetic blow out centre axis in pendulum mound of pendulum mound in the utility model
The angular relationship curve graph of central axis.
Specific embodiment
It elaborates below in conjunction with the accompanying drawings to the utility model.
With reference to Fig. 1,2,3,4,5, a kind of collision raising frequency formula bistable state piezoelectric harvester, by plectrum 1, piezoelectric beam 2, pendulum mound 3,
Shaft 4, magnet 5 and circular housing pedestal 6 form；Circular housing pedestal 6 includes integrally formed circular ring shape shell and circular base
Seat；Shaft 4 is coaxially disposed with cup dolly, and shaft 4 forms revolute pair with cup dolly.Pendulum mound 3 includes integrally formed the
One semicolumn and the second semicolumn, the radius ratio shaft big 2mm of 4 radius of the first semicolumn, the radius ratio annulus of the second semicolumn
The small 4mm of internal diameter of shape shell；The centre bore half that pendulum mound 3 opens up is located on the first semicolumn, the other half is located at the second semicolumn
On；The centre bore of pendulum mound 3 is fixed in shaft 4, and a circular hole, the central axis position of circular hole are opened up on the cylinder of the second semicolumn
In on the plane of symmetry of the second semicolumn；Circular hole embeds one block of magnet 5.Circular ring shape housing interior side-wall is fixed with symmetrically arranged two
Plectrum group；Each plectrum group includes the three pieces plectrum along 4 circumferentially equidistant arrangement of shaft, with circle folded by the adjacent plectrum of plectrum group
Heart angle is 40 °；The plectrum side horizontal setting in centre position in plectrum group；At the top of two plectrum groups and two panels that bottom is nearest is dialled
Central angle folded by piece is 100 °；A piezoelectric beam 2 is equipped with between the every adjacent two panels plectrum of plectrum group；With a plectrum group pair
Central angle folded by two piezoelectric beams 2 answered is 40 °, and in the corresponding piezoelectric beam 2 of different plectrum groups, is had folded by two piezoelectric beams 2
Central angle is 180 °.Plectrum 1 is corresponding with respect to the axial position of shaft 4 with piezoelectric beam 2 with respect to the axial position of shaft 4；4 diameter of shaft
On direction, the distance in plectrum 1 and 4 axle center of shaft is less than the distance of 2 outer end end face of piezoelectric beam and 4 axle center of shaft；In circular ring shape
Housing interior side-wall bottom position fixes one block of magnet 5, the magnet 5 on the second semicolumn and 5 phase of magnet on the inside of circular ring shape shell
Magnetic pole to end is identical；During original state, under pendulum mound its own gravity and the repulsive force collective effect of two blocks of magnet, pendulum mound center of gravity
Angle with 4 axial connecting line of shaft and vertical plane is α/2, α=39 °.
Magnet uses cylinder in the present embodiment, it is possible to use other shapes.
Referring to Fig. 6, the operation principle of the collision raising frequency formula bistable state piezoelectric harvester is as follows：
Pendulum mound 3 is placed vertically when human body carries.Magnet 5 on second semicolumn and the magnet 5 on the inside of circular ring shape shell
Mutually exclusive magneticaction so that there are two potential wells (angle is at-α/2 and α/2 in Fig. 6) and a potential barriers for 3 potential energy of pendulum mound
(angle is at 0 in Fig. 6), two potential well positions are located at the both sides of magnet 5 on the inside of circular ring shape shell respectively, and potential barrier position is located at circle
At 5 position of magnet on the inside of annular outer cover, therefore, pendulum mound is bistable structure.
When human body swing brings the excitation of pendulum mound less than critical value needed for barrier height is crossed, pendulum mound 3 is swung in human body
It 4 is swung in a wherein potential well around the shaft under frequency, so as to piezoelectric beam 2 be driven to collide with plectrum 1 by shaft 4,
2 high frequency of piezoelectric beam (60~300Hz) is caused to vibrate, realizes transformation of the low frequency to high frequency；High-frequency vibration, which occurs, for piezoelectric beam 2 to generate
Electric energy, so as to achieve the purpose that prisoner can.Piezoelectric beam 2 and the combination of plectrum 1 collide, and effectively increase output power.
When human body swing brings the excitation of pendulum mound more than critical value needed for barrier height is crossed, two gesture occur for pendulum mound 3
Period or chaotic motion between trap, increase the impact force between piezoelectric beam 2 and plectrum 1, collect more swing energy, further
Output power is improved, widening effectively prisoner can frequency band.
When the excitation that human body swing brings pendulum mound is attenuated to less than critical value needed for barrier height is crossed, pendulum mound 3 is in people
It 4 is swung in a wherein potential well around the shaft under body hunting frequency, also there is same amount of piezoelectric beam 2 to be sent out with corresponding plectrum 1
Raw collision, causes 2 high frequency of piezoelectric beam (60~300Hz) to vibrate.
According to the intensity of arbitrary excitation, change 5 size of magnet on the second semicolumn, the magnet 5 on the inside of circular ring shape shell
To cross excitation needed for barrier height strong to adjust pendulum mound 3 for the magnetic induction intensity of size, the spacing of two blocks of magnet and two blocks of magnet
The critical value of degree.
Claims (2)
1. a kind of collision raising frequency formula bistable state piezoelectric harvester, by plectrum, piezoelectric beam, pendulum mound, shaft, magnet and circular housing bottom
Seat composition, it is characterised in that：The circular housing pedestal includes integrally formed circular ring shape shell and cup dolly；Shaft with
Cup dolly is coaxially disposed, and shaft forms revolute pair with cup dolly；The pendulum mound includes integrally formed first semicircle
Column and the second semicolumn, the big 2~4mm of radius ratio shaft radius of the first semicolumn, outside the radius ratio circular ring shape of the second semicolumn
Small 4~the 6mm of internal diameter of shell；The centre bore half that pendulum mound opens up is located on the first semicolumn, the other half is located on the second semicolumn；
The centre bore of pendulum mound is fixed in shaft, opens up a circular hole on the cylinder of the second semicolumn, and the central axis of circular hole is located at the
On the plane of symmetry of two semicolumns；Circular hole embeds one block of magnet；Circular ring shape housing interior side-wall is fixed with symmetrically arranged two plectrums
Group；The plectrum group includes the three pieces plectrum along the circumferentially equidistant arrangement of shaft, with a center of circle folded by the adjacent plectrum of plectrum group
Angle is β, β values between 20~45 °；The plectrum side horizontal setting in centre position in plectrum group；At the top of two plectrum groups and
Central angle folded by the nearest two panels plectrum in bottom is 180 ° of -2 β；One is equipped with between the every adjacent two panels plectrum of plectrum group
Piezoelectric beam；It is β with a central angle folded by corresponding two piezoelectric beams of plectrum group, and in the corresponding piezoelectric beam of different plectrum groups, has
Central angle folded by two piezoelectric beams is 180 °；The axial position pair of plectrum shaft opposite with piezoelectric beam with respect to the axial position of shaft
It should；In the radial direction, the distance of plectrum and rotating shaft core is less than the distance of piezoelectric beam outer end end face and rotating shaft core to shaft；In circle
Annular outer cover madial wall bottom position fixes one block of magnet, the magnet on the second semicolumn and the magnet phase on the inside of circular ring shape shell
Magnetic pole to end is identical；During original state, pendulum mound center of gravity and the angle of rotating shaft core line and vertical plane are α/2, α=β-k, k
The value between 0.5~2 °.
2. a kind of collision raising frequency formula bistable state piezoelectric harvester according to claim 1, it is characterised in that：α is according to second
The magnetic strength of the magnet size on the inside of magnet size, circular ring shape shell on semicolumn, the spacing of two blocks of magnet and two blocks of magnet
Answer intensity adjustment.
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| CN201721589834.6U CN207490793U (en) | 2017-11-24 | 2017-11-24 | A kind of collision raising frequency formula bistable state piezoelectric harvester |
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| CN201721589834.6U CN207490793U (en) | 2017-11-24 | 2017-11-24 | A kind of collision raising frequency formula bistable state piezoelectric harvester |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107742994A (en) * | 2017-11-24 | 2018-02-27 | 杭州电子科技大学 | One kind collision raising frequency formula bistable state piezoelectric harvester and its prisoner can methods |
| CN109185086A (en) * | 2018-10-18 | 2019-01-11 | 洛阳理工学院 | A kind of gravity bob period adjustable raising frequency formula human body pendulum energy collection device |
| CN110212693A (en) * | 2019-06-12 | 2019-09-06 | 南方科技大学 | Energy collecting device and wearable electronic equipment |
| CN112134489A (en) * | 2020-09-04 | 2020-12-25 | 厦门大学 | Eccentric installation rotary piezoelectric vibration energy collecting device |
-
2017
- 2017-11-24 CN CN201721589834.6U patent/CN207490793U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107742994A (en) * | 2017-11-24 | 2018-02-27 | 杭州电子科技大学 | One kind collision raising frequency formula bistable state piezoelectric harvester and its prisoner can methods |
| CN107742994B (en) * | 2017-11-24 | 2023-09-22 | 杭州电子科技大学 | Collision frequency-rising bistable piezoelectric energy harvester and energy harvesting method thereof |
| CN109185086A (en) * | 2018-10-18 | 2019-01-11 | 洛阳理工学院 | A kind of gravity bob period adjustable raising frequency formula human body pendulum energy collection device |
| CN110212693A (en) * | 2019-06-12 | 2019-09-06 | 南方科技大学 | Energy collecting device and wearable electronic equipment |
| CN112134489A (en) * | 2020-09-04 | 2020-12-25 | 厦门大学 | Eccentric installation rotary piezoelectric vibration energy collecting device |
| CN112134489B (en) * | 2020-09-04 | 2021-09-24 | 厦门大学 | Eccentric installation rotary piezoelectric vibration energy collecting device |
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