CN205681334U - A kind of from frequency modulation piezoelectricity current energy accumulator - Google Patents
A kind of from frequency modulation piezoelectricity current energy accumulator Download PDFInfo
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- CN205681334U CN205681334U CN201620625556.4U CN201620625556U CN205681334U CN 205681334 U CN205681334 U CN 205681334U CN 201620625556 U CN201620625556 U CN 201620625556U CN 205681334 U CN205681334 U CN 205681334U
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- shell
- boss
- reed
- piezoelectric vibrator
- metal substrate
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Abstract
The utility model relates to a kind of from frequency modulation piezoelectricity current energy accumulator, belongs to river monitoring field.Position-limited rack is provided with base plate and limiting plate；Base plate is arranged on inner-walls of duct, and the planar section that limiting plate is connected with base plate is fixed with reed；Reed is vertical with pipe centerline, and reed free end is provided with left and right half-shell；Be crimped with metal substrate between the end face of left and right half-shell diapire, metal substrate bonding with piezoelectric chip become piezoelectric vibrator, piezoelectric vibrator free end is provided with mass, and piezoelectric vibrator is connected with circuit board through wire；Left shell half front and rear wall is provided with left boss, and right half-shell front and rear wall is provided with right boss；Distance between two left boss is equal with the distance between two right boss and is more than piezoelectric chip width, is less than metal substrate width；Being designed with circular arc confined planes on the boss of left and right, confined planes is tangent with the end face of the left shell half diapire at its place or right half-shell diapire.Advantage characteristic: flow velocity is adaptable, effective band width, reliability high, generating capacity is strong.
Description
Technical field
The utility model belongs to river monitoring technical field, is specifically related to a kind of from frequency modulation piezoelectricity current energy accumulator, is used for
Construction self-powered river monitoring system.
Background technology
The river that China spreads all within the border reaches thousands of more than.In recent years, owing to industrial waste sewage strength disposal is inadequate, water and soil
The reasons such as loss and the improper use such as agricultural chemicals and chemical fertilizer, all there is a certain degree of pollution problem, the river of nearly 1/4 in major part river
Stream or section can not meet basic irrigation demand because of pollution.Further, since a lot of at present areas middle and small river flood control installation
Imperfection, even without any flood control installation, may cause inrushing or overflowing the danger such as dike when arriving flood season, directly threaten edge
The safety of life and property of the bank masses.Therefore, river monitoring is paid much attention to by national correlation department, water during 12
The just once plan of profit portion realizes more than the 5000 bar rivers determining " middle and small river is administered and Small Reservoir reinforcement ad hoc planning "
Monitoring all standing；Meanwhile, domestic experts and scholars also propose corresponding monitoring method and means in succession, including dirty for river
The water quality monitoring technology of dye, for monitoring skills such as the rainfall of flood control and the natural calamity such as mud-rock flow, water level and urban river water flow velocitys
The many-sides such as art.Although some monitoring method being proposed but not yet obtains the long-pending of big face at technological layer with more ripe at present
Popularization and application, its one of the main reasons is that monitoring system power supply problem is not well solved.
Content of the invention
For the problem existing for existing river monitoring system power supply aspect, the utility model proposes a kind of from frequency modulation piezoelectricity
Current energy accumulator.The utility model adopted implementation scheme is that position-limited rack is provided with base plate and limiting plate, and limiting plate is by planar section
Constitute with curved sections two parts；Base plate is arranged on inner-walls of duct through screw, on the planar section that limiting plate is connected with base plate
It is fixed with reed through screw and pressing plate；The plane of reed and the central axis of pipeline, reed free end is provided with a left side through screw
Half-shell, left shell half is connected with right half-shell through screw and constitutes airtight cavity；The end face of left shell half diapire and right half-shell diapire it
Between be crimped with metal substrate, the metal substrate piezoelectric chip bonding with its both sides institute constitutes cantilever beam type piezoelectric vibrator, and piezoelectricity shakes
Sub-free end is provided with mass through screw, and piezoelectric vibrator is connected with the circuit board being arranged on the right wall of right half-shell through wire；Left
It is designed with left boss on the antetheca of half-shell and rear wall, the antetheca of right half-shell and rear wall are designed with right boss；In left shell half two
Distance between individual left boss is equal with the distance between two right boss in right half-shell and is more than piezoelectric chip width, is less than Metal Substrate
Plate width；It is designed with limiting the circular arc confined planes of piezoelectric vibrator deflection, confined planes and its place on left boss and right boss
Left shell half diapire or the end face of right half-shell diapire tangent.
In the utility model, reed-left and right half-shell constitutes vibrational system I, piezoelectric vibrator-mass constitutes vibrational system
II, therefore energy accumulator pertains generally to 2DOF vibrational system, when the intrinsic frequency of dynamic excitation frequency and vibrational system I or II
Close to when energy accumulator generated energy all will appear from peak value, effective band width.
Under off working state, reed, left shell half, right half-shell and piezoelectric vibrator are all in inactive state, and reed and pipeline
Center line perpendicular.
When having fluid to flow through in pipeline, reed produces flexural deformation and root abuts in the curved sections of limiting plate, thus
The effective jib-length making reed reduces, bending stiffness increases, the intrinsic frequency of vibrational system I increases；Fluid velocity reaches foot
Enough big when limiting plate curved sections will all with switch jaw contact, now effective jib-length of reed is the shortest, bending stiffness is maximum,
The intrinsic frequency of vibrational system I is maximum.
Also can produce toll bar Xuan Jie when fluid flows through reed after reed, alternately producing of whirlpool can make reed with coming off
Front and back two side liquid pressure alternately change and make vibrational system I be produced from excited vibration, thus drive vibrational system II of reciprocating vibration,
And convert mechanical energy into electric energy through piezoelectric vibrator；Because the self-excited vibration frequency i.e. shedding frequence of whirlpool is with the increase of rate of flow of fluid
And increase, when the intrinsic frequency of free-running frequence and vibrational system I is same or like, left and right half-shell amplitude is maximum, piezoelectric vibrator
It is excited intensity and peak value all occurs in generated energy.Clearly for energy accumulator of the present utility model, rate of flow of fluid increase makes free-running frequence
During increase, the intrinsic frequency of vibrational system I is consequently increased, and has from frequency modulation function, has effectively expanded frequency bandwidth, flow velocity
Adaptable.
When the intrinsic frequency of free-running frequence and vibrational system II is same or like, the amplitude of piezoelectric vibrator and generated energy are also
Peak value will occur；And when piezoelectric vibrator deflection reaches to a certain degree, metal substrate will bear against on confined planes, thus limits
Having made increasing further and making the stress distribution of piezoelectric chip uniformly of piezoelectric vibrator deflection, generated energy and reliability are all big
Amplitude promotes.In the utility model, for improving piezoelectric vibrator generating capacity and reliability, piezoelectric chip is the PZT4 of 0.2mm, gold
Belonging to substrate is beryllium-bronze, and metal substrate is 1～2.5 with the ratio of piezoelectric chip thickness；Confined planes minimum profile curvature radius isWherein α=hm/hpFor thickness ratio, hmAnd hpIt is respectively metal substrate and piezoelectricity
The thickness of wafer.
Advantage and characteristic: 1. energy accumulator is that the intrinsic frequency of two degree freedom system and vibrational system I can automatically adjust, therefore has
Effect bandwidth, flow velocity are adaptable；2. piezoelectric chip deflection is controlled, stress distribution uniform, therefore generating capacity is strong, reliability
High.
Brief description
Fig. 1 is the structural representation of energy accumulator under off working state in one preferred embodiment of the utility model；
Fig. 2 is the right view of Fig. 1；
Fig. 3 is the I portion enlarged drawing of Fig. 1；
Fig. 4 is the A-A sectional view of Fig. 3；
Fig. 5 is the structural representation of right half-shell in one preferred embodiment of the utility model；
Fig. 6 is the left view of Fig. 5；
Fig. 7 is the structural representation of position-limited rack in one preferred embodiment of the utility model；
The structural representation of energy accumulator when Fig. 8 is that in one preferred embodiment of the utility model, flow velocity is bigger.
Detailed description of the invention
Position-limited rack d is provided with base plate d1 and limiting plate d2, and limiting plate d2 is made up of planar section d3 and curved sections d4 two parts；
Base plate d1 is arranged on pipeline a inwall through screw, through screw and pressure on the planar section d3 that limiting plate d2 is connected with base plate d1
Plate c is fixed with reed b；The plane of reed b and the central axis of pipeline a, the free end of reed b is provided with left shell half through screw
E, left shell half e is connected with right half-shell g through screw and constitutes airtight cavity C；Left shell half e diapire e1 and the diapire g1 of right half-shell g
End face between be crimped with metal substrate h1, the metal substrate h1 piezoelectric chip h2 bonding with its both sides institute constitutes cantilever beam type pressure
Electric tachometer indicator h, the free end of piezoelectric vibrator h is provided with mass f through screw, piezoelectric vibrator h through wire be arranged on right half-shell g
Circuit board i on right wall is connected；Be designed with left boss T1 on the antetheca e2 of left shell half e and rear wall e3, the antetheca g2 of right half-shell g and
It is designed with right boss T2 on rear wall g3；Distance L between two left boss T1 in left shell half e and upper two the right boss of right half-shell g
Distance L between T2 ' equal and width L2 more than piezoelectric chip h2, less than the width L1 of metal substrate h1；Left boss T1 and the right side
It is designed with limiting the circular arc confined planes M of piezoelectric vibrator h deflection, the end of left shell half e at confined planes M and its place on boss T2
The end face of the diapire g1 of wall e1 or right half-shell g is tangent.
In the utility model, right half-shell g of reed b-left shell half e-constitutes vibrational system I, piezoelectric vibrator h-mass f is constituted
Vibrational system II, therefore energy accumulator pertains generally to 2DOF vibrational system, when dynamic excitation frequency and vibrational system I or vibration
The intrinsic frequency of system II close to when energy accumulator generated energy all will appear from peak value, therefore effective band increases considerably.
Under off working state, reed b, left shell half e, right half-shell g and piezoelectric vibrator h all in inactive state, and reed b with
The center line of pipeline a is perpendicular.
When having fluid to flow through in pipeline a, reed b produces flexural deformation and root abuts in curved sections d4 of limiting plate d,
So that effective jib-length of reed b reduces, bending stiffness increases, the intrinsic frequency of vibrational system I increases；Fluid velocity reaches
To all contact with reed b to curved sections d4 of limiting plate d when sufficiently large, now effective jib-length of reed b is the shortest, bending
Rigidity is maximum, the intrinsic frequency of vibrational system I is maximum.
Also can produce toll bar Xuan Jie when fluid flows through reed b after reed b, alternately producing of whirlpool can make spring with coming off
Before and after piece b, the fluid pressure of both sides alternately changes and makes vibrational system I be produced from excited vibration, thus drives vibrational system II reciprocal
Vibration, and convert mechanical energy into electric energy through piezoelectric vibrator h；Because the self-excited vibration frequency i.e. shedding frequence of whirlpool is with rate of flow of fluid
Increase and increase, when the intrinsic frequency of free-running frequence and vibrational system I is same or like, shaking of left shell half e and right half-shell g
Width is maximum, and piezoelectric vibrator h is excited intensity and peak value all occurs in generated energy.Clearly for energy accumulator of the present utility model, fluid stream
When speed increase makes free-running frequence increase, the intrinsic frequency of vibrational system I is consequently increased, and has from frequency modulation function, effectively opens up
Having opened up the frequency bandwidth of system, flow velocity is adaptable.
When the intrinsic frequency of free-running frequence and vibrational system II is same or like, the amplitude of piezoelectric vibrator h and generated energy
Peak value also all can occur；And when piezoelectric vibrator h deflection reaches to a certain degree, metal substrate h1 will bear against on confined planes M,
Thus limit increasing further and making the stress distribution of piezoelectric chip h2 uniform of piezoelectric vibrator h deflection, generated energy and can
All significantly promote by property.In the utility model, for improving generating capacity and the reliability of piezoelectric vibrator h, piezoelectric chip is
The PZT4 of 0.2mm, metal substrate are beryllium-bronze, and the ratio of the thickness of metal substrate h1 and piezoelectric chip h2 is 1～2.5；Confined planes M
Minimum profile curvature radius beWherein α=hm/hpFor thickness ratio, hmAnd hpRespectively
Thickness for metal substrate h1 and piezoelectric chip h2.
Claims (1)
1. one kind from frequency modulation piezoelectricity current energy accumulator, it is characterised in that: position-limited rack is provided with base plate and limiting plate, and limiting plate is by putting down
Face section and curved sections two parts are constituted；Base plate is arranged on inner-walls of duct, solid on the planar section that limiting plate is connected with base plate
Surely there is reed；Reed is vertical with pipe centerline, and reed free end is provided with left shell half, and left shell half is connected with right half-shell and constitutes
Airtight cavity；It is crimped with metal substrate, the metal substrate piezoelectricity bonding with its both sides institute between the end face of left and right half-shell diapire
Wafer constitute cantilever beam type piezoelectric vibrator, piezoelectric vibrator free end is provided with mass, piezoelectric vibrator through wire be arranged on the right side
Circuit board on the right wall of half-shell is connected；It is designed with left boss before and after left shell half on wall, before and after right half-shell, on wall, be designed with the right side
Boss；Distance between two left boss is equal with the distance between two right boss and is more than piezoelectric chip width, is less than Metal Substrate
Plate width；It is designed with limiting the circular arc confined planes of piezoelectric vibrator deflection, the left side at confined planes and its place half on the boss of left and right
The end face of shell diapire or right half-shell diapire is tangent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620625556.4U CN205681334U (en) | 2016-06-15 | 2016-06-15 | A kind of from frequency modulation piezoelectricity current energy accumulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620625556.4U CN205681334U (en) | 2016-06-15 | 2016-06-15 | A kind of from frequency modulation piezoelectricity current energy accumulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205681334U true CN205681334U (en) | 2016-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620625556.4U Expired - Fee Related CN205681334U (en) | 2016-06-15 | 2016-06-15 | A kind of from frequency modulation piezoelectricity current energy accumulator |
Country Status (1)
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| CN (1) | CN205681334U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880885A (en) * | 2019-05-18 | 2020-03-13 | 浙江师范大学 | Vortex-induced vibration energy harvester |
| CN110880886A (en) * | 2019-05-18 | 2020-03-13 | 浙江师范大学 | Wind-induced vibration piezoelectric energy harvester |
-
2016
- 2016-06-15 CN CN201620625556.4U patent/CN205681334U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880885A (en) * | 2019-05-18 | 2020-03-13 | 浙江师范大学 | Vortex-induced vibration energy harvester |
| CN110880886A (en) * | 2019-05-18 | 2020-03-13 | 浙江师范大学 | Wind-induced vibration piezoelectric energy harvester |
| CN110880885B (en) * | 2019-05-18 | 2021-11-12 | 浙江师范大学 | Vortex-induced vibration energy harvester |
| CN110880886B (en) * | 2019-05-18 | 2021-11-12 | 浙江师范大学 | Wind-induced vibration piezoelectric energy harvester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161109 Termination date: 20170615 |