(Machine Translation by Espacenet)
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`Bibliographic data
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`CN204376762 (UU)
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`- Novel piezoelectric generator
`
`inventor(s):
`
`ZHANG ZHONGHUA; LIU DEANLONG: WANG SHUYUN: KAN JUNWU: ZENG
`
`JINGZHU
`
`Apmicant(s):
`UNIV ZHEJIANG NORMAL
`
`Classification:
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`- infernational:
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`HO2N248
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`~ cooperative:
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`Application number:
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`CN20152009462U 20150107
`
`Priory number(s):
`CN20152008482U 20150107
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`Abstract
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`Abstract of CN204376762 ()
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`The uly moceil relates to a novel piezoelectric generator which belongs to the technical
`
`field of new energy. An cuter cylinder is arranged between a brackel bedplate and 4
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`spigot ring of a cover plate through a screw. An inner cylinder is pressed between the
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`bracket bedplate and a sink hole of the cover plate. Two mass blocks, a magnetic ring
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`and a nut form an inertia block. The inertia block is sleeved in the inner cylinder and is
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`connected with the bracket becdplate through a spring. Two metal sheeis are riveted to
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`farm a piezoelectric vibrator, wherein piezoelectric sheets are bonded on the circular arc
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`convex sections of the metal sheets. Each piezoelectric vibrator, a wedge block and a
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`magnetic block form a transducer, wherein the wedge biock and the magnetic block are
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`riveted with both ends of the piezoelectric vibrator. Two groups of transducer wedge
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`

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`blocks aré arranged in dovetail grooves on the inner wail of tne outer cylinder. Guide
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`posts of the magnetic blocks are respectively arranged in two groups of radial through
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`noales in the side wall of the inner cylinder. The magnetic blocks are close to the oppasite
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`magnetic pole of
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`ihe magnetic ring. The novel piezoelectric generator has the
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`advantages thai
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`the piezoelectric sheets are only under compressive stress;
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`the
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`deformation of the piezoelectric vibrators is vertical to a vibration direction, and is not
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`directly related to the mass of the inertia block; ine transducers and an inertia block-
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`spring sysiem farm a two-freedom-degree system: and the novel piezoelectric generator
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`nas the advantages of high reliability, low natural frequency and wide effective frequency
`band.
`
`Claims
`
`Natice
`
`This transiation is machine-generated.
`
`It cannot be guaranteed that it
`
`is intelligible,
`
`accurate, complete,
`
`reliable or fil for specific purposes. Critical decisions, such as
`
`commercially relevant or financial decisions, should not be based on machine-transiation
`
`output,
`
`CLAIMS CN204376762U
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`A novel piezoelectric power generation device, characterized in that: a stop fing and a
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`counterbore are respectively provided at the periphery and the center of the support plate,
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`and @ stop ring and a counterbore are respectively provided af the periphery and the
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`center of the cover plate; An outer cylinder is installed between the stop ring on the cover
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`plate and the stop ring on the cover plate through screws, and an inner tube is crimped
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`beiween ihe counterbore on the support platen and the counterbore on the cover plate:
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`There are axial dovelall grooves, and hwo sets of upper and lower radial through holes
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`are evenly distributed on the side wail of the inner cylinder, mass block 1 and magnetic
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`ring aré set on the column of mass block 2 in turn and locked by nuts, mass block 1,
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`mass Block 2. The magnetic ring and the nut togeiner constitute the inertia block; the
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`inertia block is set in the inner hole ofthe inner cylinder, and the inertia block is connected
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`wih the support plate through a spring; The metal sheet is riveted by rivets to form a
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`piezoelectric vibrator. The piezoelectric vibrator and the wedge-shaped blocksriveted at
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`bath ends and the magnetic block together form a transducer. In the dovetail groove on
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`

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`ine inner wall, the magnetic block guide posts are installed in two sets of radial through
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`holes on the inner cylinder side wail, the opposite magnetic poles of the magnetic block
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`an ihe transducer and the magnetic ring on the inertial block are installed close to sach
`
`other.
`
`Description
`Notice
`
`This transiation is machine-generated.
`
`it cannot be guaranteed that it
`
`is intelligible,
`
`accurate, complete,
`
`reliable or ft for specific purposes. Critical decisions, such as
`
`commercially relevant or financial decisions, should not be based on machine-transiation
`
`output
`
`DESCRIPTION CN204376762U
`
`A Novel Piezoelectric Generating Device
`
`[0004]
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`technical field
`
`{o002]
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`The uilty model belongs to the technical field of new energy, and in particular relates to
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`& novel piezoelectric power generation device, which is used for energy recovery of
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`longitudinal vibration with low frequency, large amplitude and high intensity.
`
`(O003]
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`Background technique
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`[e004]
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`in order to meet the sel- power supply requirements of micro-powerelectronic praducts
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`and micro-miniature remote sensing and embedded monitoring systems, and to avoid
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`the pollution of the environment by a large number of waste batteries, research on micro-
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`miniature power generation devices based on the principles of electromagnetic,
`
`

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`electrostatic, thermoelectric, capacitive and piezoelectric has been carried oul. Become
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`a frontier hotspot at home and abroad.
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`All kinds of power generation devices have iheir own advantages and applicable fields.
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`The advantages of piezoelectric vibration power generation devices are simple structure,
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`easy manufacture, and realization of structural miniaturization and integration.
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`in the
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`fields of sensors, healih monitoring and wireless transmission sysiems.
`
`£0005]
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`in terms of using piezoelectric materials to recycle environmental energy for power
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`generation, there are many patent applications al home and abroad, most of which are
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`for the purpose of recycling vibration energy.
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`AS we all know, for the vibrating piezoeleciric generator, only when the natural frequency
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`of the piezoelectric vibrator is equal to the vibration frequency of the environment can a
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`higher power generation capacity and energy conversion efficiency be achieved.
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`However, the resonant frequency of the piezoelectric vibrator itself is usually high.
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`Among them, the resonant frequency of the piezoelectric cantiiever beam reaches
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`several hundred Hz, and the resonant frequency of the circular piezoelectric vibrator is
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`as high as several thousand Hz, while the environmental vibration frequency is generally
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`more than a dozen Hz, or even His anly a few hertz, so the effect of directly using the
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`piezoelectric vibrator to collect environmental vibration energy is not significant.
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`in order to reduce the natural frequency of the piezoelectric vibrator, ihe current method
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`is to directly install a concentrated mass block at the end of the cantilever beam
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`piezoelectric vibrator or the center of the circular piezoelectric vibrator. The disadvantage
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`is that when the instalied mass blockis large, even in the When the piezoelectric vibrator
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`is not working, the piezoelectric vibrator has already undergone a large deformation, anc
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`iis very easy to be damaged due to excessive deformation during operation. The reason
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`is ihat the piezoelectric ceramic material
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`is very brittle, and its ability to withstand
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`deformation is extremely limited. Even a long cantilever piezoelectric vibrator has a safe
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`deformation of only millimeters. in real life, conventional environmental vibration is mainly
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`induced by the operation of various vehicles and human body movement. This type of
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`vibration has the dual characteristics of low frequency and large amplitude. it can reach
`
`

`

`several centimeters or even tens of centimeters. It can be seeninal the existing portable
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`vibration power generation device is difficult to obtain wider application in practice.
`
`fO008)
`
`Contents of ihe invention
`
`£0007]
`
`Aiming ai the imitations of existing piezoelectric vibration power generation devices such
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`as lowreliability and poor adaptability to low-frequency environments, the utilly model
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`provides a new type of piezoelectric power generation device, which is used for low-
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`frequency, large Amplitude, and high-intensity vibration energy recovery.
`
`The implementation scheme adopted by ihe utility model is: the periphery and ithe center
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`ofthe platen ofthe support are respectively provided with a stop ring and the counterbore,
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`and the periphery and the center of the cover plate are respectively provided with a stop
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`ring and a counterbore; An outer cylinder is installed between the mouth ring and the
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`stop ring on the cover plate through screws, and an inner cylinder is crimped between
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`the counterbore on the support platen and the counterbore on the cover plate; shafis are
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`evenly distributed on the inner wall of the outer cylinder There are two sets of radial
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`through holes evenly distributed on the side wall of the inner cylinder, mass block 1 and
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`magnetic ring are set on the column of mass block 2 in turn and locked by nuts, mass
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`block 1 and mass block 2 , the magnetic ring and the nut together constitute the inertial
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`block; the inertial block is set in the inner hole of the inner cylinder, and the inertial block
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`is connected with the bracket plate through a spring; ihe height of ihe magnetic ring is
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`smaller than the axis between the two sets of radial through holes on the inner cylinder
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`side wall and the distance from the magnetic ring to the center of the two groups of
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`irough holes is equal when His nol working: two metal sheets with piezoelectric sheeis
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`bonded to their circular arc convex seciions are riveted by rivets to form a piezoeleciric
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`vibrator. The vibrator and the wedge-shaped bDiocks riveted al both ends and the
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`magnetic block together form a transducer. The height of ine wedge-shaped block is
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`greater than that of the magnetic block, and there are guide posts on the magnetic block:
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`the wedge-shaped blocks of the two sets of transducers are installed on the inner wail of
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`the outer cylinder in turn. in the dovetail groove ofthe dovetail, anc pressed on the platen
`
`af the bracket through the cover plate, the quide posts of the magnetic blocks on the two
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`

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`sets of transducers are respectively placed in the two sets of radial through holes onthe
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`side wail of the inner cylinder; the transducers The opposite magnetic poles of the upper
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`magnetic block and the upper magnetic ring of the inertial block are installed clase to
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`each other.
`
`fO008]
`
`in order to maximize the use of vibration energy by the piezoelectric vibrator and avoid
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`damage to the plezoslecinic sheet due to excessive tensile stress, the minimum radius
`of the outer surface of the arc on the metal sheet when the transduceris not assembled
`
`should be h p and h m respectively in the formula Thickness of piezoelectric sheet and
`
`metal sheet, a=hm/nim+thp}, BeE m/e p,E p and Em are Young's modulus of
`
`piezoelectric
`
`sheet
`
`and
`
`metal
`
`sheet
`
`respectively,
`
`<img
`
`fle="BSA00001 12766000000023. TIF" he="77" img-content="drawing” img-format="tt"
`
`inline="yes" orientation="portrait’ wie"104"/> T p is
`
`respectively Electromechanical
`
`coupling coefficient and allowable tensile stress of piezoelectric materials.
`
`(0009)
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`Yhen not working, the inertia Diock is in a balanced state under the action of the spring,
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`and the distance between ihe magnetic blocks on the two sets of transducers of the
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`magnetic ring is equal. Because the magnetic blocks and the opposite poles of the
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`magnetic ring are installed close fo each other, ihe piezoelectricity in the two sets of
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`transducers The vibrators are allin a tensioned state, and the tensile force is equal: when
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`the power generation device is excited by the longitudinal vibration in the environment,
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`the inertial block reciprocates up and down along ihe inner hole of ihe inner cylinder,
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`resuiling in a gap between the magnetic block at the end of the transducer and the
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`magnetic ring an ihe inertial block. The distance changes: when the inertial block moves
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`upward, the distance between the magnetic ring and the magnetic block on the group |
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`transducer decreases, and the distance between the magnetic block on the group i
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`transducer increases, so that the group | transducer The tensile farce on the piezoelectric
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`vibrator in group Hl increases, and the tensile force on the piezoeleciric vibrator in group
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`ii transducer decreases; similarly, when the inertial block moves downward, the tensile
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`farce on the piezoelectric vibrator in group |
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`transducer The tensile forse on the
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`piezoelectric vibrator in the transducer group Hl increases: as the inertia block moves up
`
`and down continuously, the piezoelectric vibrator will be in alternate stretching and
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`

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`shrinking deformation states,
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`thereby converting mechanical energy into electrical
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`energy.
`
`£0010]
`
`in the ullity model,
`
`since the piezoelectric vibrator
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`is a pre-bent structure,
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`the
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`piezoelectric sheet
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`is not subjected to external force in the natural state before
`
`installation, and the piezoelectric vibrator is subjected to tension when it is not working
`
`afier installation, sa the piezoelectric wafer bears compressive stress; when the inertia
`
`The biock vibrates up and down so that the compressive stress on the piezoelectric sheet
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`increases when the magnetic ring is clase to the magnetic block, and the compressive
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`stress on the piezoelectric sheet decreases when the magnetic ring is away from the
`
`magnetic block,
`
`so the piezoelectric sheet will never bear tensile stress.
`
`ji
`
`is
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`perpendicular to the deformation direction of the piezoelectric vibrator, and the vibration
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`inlensity has no direct influence on ihe deformation of the piezoelectric vibrator, so the
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`reliability of the power generation device is high.
`
`10014]
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`in the utility model, the tensile force on the piezoelectric vibrator and the compressive
`
`siress on the piezoelectric sheet depend on ihe vibration characierisiics of the ineriial
`
`block, so the inertia of the system compased of the inertial block and the spring can be
`
`reduced by increasing the mass of the inertial block and reducing the stiffness of the
`
`spring. In addition, because the natural frequency of the sysiem composedof the inertia
`
`block and the spring is different from the natural frequency of the transducer, there will
`
`be two optimal frequency sections to make the power generation capacity the strongest,
`
`thai is, the ullity model The new power generation device is actually a two-degree-of-
`
`freedam system with an effective frequency bandwidth.
`
`10072]
`
`The features and advantages of this uliliy model are: (Using the expansion and
`
`deformation of the pre-bent piezoelectric vibrator in the jength direction to generate
`
`power, the piezoelectric sheet is always under cornpressive siress during wark, and will
`
`not be damaged due to excessive compressive stress, and the piezoelectric vibrator
`
`expands and contracts The deformation direction is perpendicular to the vibration
`
`

`

`direction of the environment, and t will not be damaged due io excessive longitudinal
`
`amplitude of the environment, so the reliability of ihe power generation device is high;
`(The gravity of the inertia block acts on the spring, and its mass has no direct impact
`
`on the vibration characteristics of the piezoelectric vibrator. Large mass inertia blocks
`
`and low stiffness springs can be used to reduce the natural frequency of the power
`
`generation device and realize low-frequency vibration energy recovery; ©) The
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`transducer and inertia block-spring sysiem constiutes a two-degree-of-freedom system
`
`with an effective frequency band.
`
`(004 3}
`
`Description of drawings
`
`£0014]
`
`Fig.
`
`1
`
`is a schematic cross-sectional view of a power generaiing device in a preferred
`
`embadiment of ihe present invention;
`
`£0015]
`
`Fig. 2 is the A-A sectional view of Fig. 7;
`
`f0016]
`
`Fig. 3 is a Structural schematic diagram of a piezoelectric vibrator in a preferred
`
`embodiment of the present invention;
`
`(0017)
`
`Fig. 4is atop view sectional view of Fig. 3;
`
`£0018]
`
`Detaled ways
`
`£0019]
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`

`

`As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the periphery and the center of
`
`the upper surface of the platen la of the support 1 are respectively provided with a stop
`
`ring and ihe counterbore, and the periphery and the center of the lower surface of the
`
`cover plate 3 are respectively provided with There is a stop ring and a counterbore; the
`
`outer cylinder 2 is installed between the siop ring around the upper surface of the
`
`platform ia of ine bracket 7 and the siop ring around the lower surface of the cover plate
`
`3 through screws, and the upper surface of the platform da of the bracket 1 The inner
`
`cylinder 6 is crimped between the counterbore of the counterbere and the counterbore
`
`of the lower surface of the cover plate 3; the inner wall of the outer cylinder 2 is uniformly
`
`provided with axial dovetail grooves, and the side wall of the inner cylinder 6 is evenly
`
`provided with wo groups of upper and lower Radial through hole 6b; mass block 1 8 and
`
`magnetic ring 9 are sequentially set on the column 10a of mass block 2 10 and locked
`
`by nut 7, mass block 1 8, mass block 2 10, magnetic ring 9 and nut 7 are jointly formed
`
`inertia block G: the inertia block G is sleeved in the inner hole Ga of the inner iube 6, and
`
`the inertia block G is connected with the platen ta of the bracket 7 through a spring 11;
`
`the height of the magnetic ring 9 is smaller than the two groups of radial The axial
`
`distance betweenthe through holes 6b, and the distance from ihe magnetic ring 9 io ihe
`
`centers of the two groups of through holes 66 during nan-working are equal; After the
`
`rivet h3 is riveted, the piezoelectric vibrator h is formed. The piezoelectric vibrator h and
`
`the wedge-shaped block 4 and ihe magnetic block 5 riveled ai both ends together form
`
`the transducer H. The height of the wedae-shaped biock 4 is greater than the height of
`
`the magnetic block 5. On the magnetic block 5 A guide posi Sa is provided: the wedge
`
`blocks 4 of the two sets of transducers H are sequentiaily installed in the doveiail grooves
`
`an the inner wall of the outer cylinder 2, and pressed on the platen ta of the bracket 1
`
`through ihe cover plate 3, the iwo sets of transducers The quide posts 5a of the magnetic
`
`block 5 on the H are respectively placed in two groups of radial through holes 6b on the
`
`side wall of the inner cylinder 6; the magnetic block 5 on the transducer H and the
`
`magnetic poles of ihe magnetic ring 9 on the inertia block G are installed close to each
`
`other,
`
`{O020)
`
`in order to make the piezoelectric vibrator h maximize the use of vibration energy to
`
`generate electricity and avoid damage to the piezoelectric sheet h2 due to excessive
`
`tensile stress, the minimum radius of the outer surface of the arc on the metal sheet hi
`
`

`

`when ihe transducer H is not assembled should be fh p and A mare the thicknesses of
`
`the piezoelectric sheet h2 and the metal sheet hi respectively, a=h m /(Am +h p}, BEE
`
`m/Ep, Ep and Em are the thicknesses of the piezoelectric sheet h2 and ihe metal
`
`sheet hi
`
`respectively Young's modulus, <img file="BSA00001 12765500066006043. TIF"
`
`he="88"
`
`img-conient="drawing"”
`
`img-formai="i?
`
`inline="yes"
`
`orientation="portrait"
`
`wie" TO08"/> Top are the electramechanical coupling coeHicient and allowable tensile
`
`stress of the piezoelectric material, respectively.
`
`£0024]
`
`in the rian-weorking natural state, the inertia block G is in a balanced state under the
`
`action of the spring 11, and the distance between the magnetic ring 9 and the magnetic
`
`block 5 on the transducer H of the | group and the II group is equal, because the magnetic
`
`block 5 and the magnetic ring The opposite magnetic poles of 9 are installed close to
`
`each other, so ihe piezoelectric vibrators h in the two seis of transducers H are in a
`
`tension state, and the tensile force is equal, when ihe power generation device is excited
`
`by the longitudinal vibration in the environment, the inertial block G moves The hale 6b
`
`reciprocates up and down, causing the distance between the magnetic block 5 at the
`
`end of the transducer H and the magnetic ring 9 on the inertial block G to change: when
`
`the inertial block G moves upward, the magnetic fing 9 and the group I transducer The
`
`distance between ihe magnetic blocks 5 on ithe H decreases, and the distance between
`
`the magnetic blocks 5 on the transducer H of the group Hf increases, so that the tension
`
`on the piezoelectric vibrator h in the transducer H of the group | increases, and the group
`
`ii The tensile force on the piezoelectric vibrator h in the transducer H decreases; similarly,
`
`when the inertial mass G moves downward, the tensile force on the piezoelectric vibrator
`
`nin the | group of transducers H decreases, and ine li group transduction The tensile
`
`force on the piezoeleciric vibrator h in the device H increases; as the inertia block G
`
`continuously reciprocates up and down, the piezoelectric vibrator h wil be in alternate
`
`streiching and contraction deformation states, thereby converting mechanical energy
`
`into electrical energy.
`
`(0022)
`
`in the utility model, since the piezoelectric vibrator h is a pre-bent structure,
`
`the
`
`piezoelectric sheet h2 is not subjected to external force in the natural state before
`
`installation, and the piezoelectric vibrator h is subjected to tension whenit is not working
`
`

`

`after installation, so the piezoelectric wafer h2 is under pressure. Stress; when the inertia
`
`block G vibrates up and down to make the magnetic ring 9 close to the magnetic block
`
`5, ihe compressive stress of the piezoelectric sheel h2 increases, and when the magnetic
`
`ring 9 is far away from ine magnetic block 5, the compressive stress of the piezoelectric
`
`sheet h2 decreases, so the piezoelectric sheet h2 will never bear the tensile stress, and
`
`because the longitudinal vibration is perpendicular to the deformation direction of the
`
`piezoelectric vibrator h, the vibration intensity has no direct influence on the deformation
`
`af the piezoelectric vibrator h, so the reliability of the power generation device is high.
`
`fO023]
`
`in the utiity model, the tensile force of the piezoelectric vibrator h and the compressive
`
`stress of the piezoelectric sheet h2 depend on the vibration characteristics of the inertial
`
`mass G, so the inerlial mass G and the spring 11 stiffness can be reduced by increasing
`
`the mass of ihe inertial mass G and reducing the The natural frequency of the sysiem
`
`composed of the spring 11, so as to realize the recovery of low-frequency vibration
`
`energy; in addition, because the natural frequency of ihe system composed of the inerila
`
`block G and the spring 11 is different from the natural frequency of the transducer H,
`
`there will be two optimal frequency seqments The power generating capacity is the
`
`strangest, thal is, the power generating device of the present ulllty model is actually a
`
`iwo-cegree-oFfreedom sysiem with an effective frequency bandwidth.
`
`

`

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