CN209544396U - Charge output element and piezoelectric acceleration sensor - Google Patents
Charge output element and piezoelectric acceleration sensor Download PDFInfo
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- CN209544396U CN209544396U CN201920392967.7U CN201920392967U CN209544396U CN 209544396 U CN209544396 U CN 209544396U CN 201920392967 U CN201920392967 U CN 201920392967U CN 209544396 U CN209544396 U CN 209544396U
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Abstract
The utility model provides a kind of charge output element and piezoelectric acceleration sensor.The charge output element includes: bracket, the connecting component including support member and setting on the supporting member；Piezoelectric element, it is set in connecting component, piezoelectric element includes multiple piezo-electric crystal groups and electrode slice, multiple piezo-electric crystal group being provided at circumferentially spaced along connecting component, multiple piezo-electric crystal groups are distributed around connecting component in polygon, including at least one piezo-electric crystal, each piezo-electric crystal parallel connection, multiple piezo-electric crystals and electrode slice along the alternately laminated setting of normal direction of the circumferential surface of connecting component in piezo-electric crystal group；Mass block is sheathed on the outer surface of piezoelectric element and the on the supporting member hanging setting in side；Wherein, piezoelectric element, connecting component and mass block are mutually interference fitted.Multiple piezo-electric crystals parallel with one another are arranged in the charge output element of the utility model, are capable of increasing the sensitivity of charge output element test, then increase the sensitivity of piezoelectric acceleration sensor.
Description
Technical field
The utility model relates to a kind of sensor technical fields, accelerate more particularly, to a kind of charge output element and piezoelectricity
Spend sensor.
Background technique
Piezoelectric acceleration sensor is also known as piezoelectric accelerometer, is a kind of inertial sensor.Piezoelectric acceleration sensor
Principle be piezoelectric effect using piezoelectric element, when accelerometer is vibrated, the power of mass block on the piezoelectric element is also therewith
Variation.When tested vibration frequency is far below the intrinsic frequency of accelerometer, then the variation of power is directly proportional to by measuring acceleration.
As required precision of the people to acceleration test is higher and higher, the sensitivity of piezoelectric acceleration sensor is increasingly
It is high.For example, standard piezoelectric acceleration transducer is that therefore, standard piezoelectric is accelerated for demarcating used in acceleration transducer
The requirement for spending sensor performance is more harsh, needs higher sensitivity, and existing piezoelectric acceleration sensor is usually sensitive
It spends not high enough, is not able to satisfy the requirement of standard piezoelectric acceleration transducer.
Therefore a kind of charge output element with higher sensitivity is needed to meet standard piezoelectric acceleration transducer
It is required that.
Utility model content
This utility model embodiment provides a kind of charge output element and piezoelectric acceleration sensor, it is intended to Neng Gouti
The sensitivity of high charge output element, while can be improved the rigidity of piezoelectric element entirety, reduce temperature caused by each material
Stress fluctuation, and then guarantee measurement accuracy.
In view of the above-mentioned problems, providing a kind of charge output element according to the utility model embodiment, comprising: bracket, including
The connecting component of support member and setting on the supporting member；Piezoelectric element is set in connecting component, and piezoelectric element includes more
A piezo-electric crystal group and electrode slice, multiple piezo-electric crystal group being provided at circumferentially spaced along connecting component, multiple piezo-electric crystal group rings
It is distributed around connecting component in polygon, includes at least one piezo-electric crystal, multiple piezo-electric crystals and electrode slice in piezo-electric crystal group
Along the alternately laminated setting of the normal direction of the circumferential surface of connecting component；Mass block is sheathed on the outer surface of piezoelectric element and is supporting
Hanging setting above component；Wherein, connecting component, piezoelectric element and mass block are mutually interference fitted, and pass through electrode slice and quality
Block keeps each piezo-electric crystal in parallel.
One aspect according to the present utility model, electrode slice include multiple first electrode sheets and at least one second electrode
Piece, piezo-electric crystal are connected by first electrode sheet and the one of them of mass block and positive or negative pole, are passed through between piezo-electric crystal
Second electrode sheet and the another one of positive or negative pole connect；Wherein, two neighboring piezo-electric crystal is close to each other in piezo-electric crystal group
Two surfaces polarity it is identical.
One aspect according to the present utility model, includes multiple piezo-electric crystals in piezo-electric crystal group, and first electrode sheet includes
First laminates portion and first connecting portion, and first portion of laminating is arranged between the two neighboring piezo-electric crystal in piezo-electric crystal group；The
Two electrode slices laminate portion and second connecting portion including second, and the two neighboring piezoelectricity in piezo-electric crystal group is arranged in second portion of laminating
Between crystal, first, which laminates portion and second portion of laminating, is arranged alternately, and first connecting portion is connect with first portion of laminating, second connecting portion
It is connect with first portion of laminating；Wherein, the first size for laminating portion is greater than or equal to the size of piezo-electric crystal, so that piezo-electric crystal energy
It is enough to fit in first electrode sheet completely；And/or second laminate portion size be greater than or equal to piezo-electric crystal size so that pressure
Transistor can fit in second electrode sheet completely.
One aspect according to the present utility model, first electrode sheet include multiple first laminate portion and at least one first connect
Socket part, first portion of laminating are additionally arranged between outermost piezo-electric crystal and mass block, and first connecting portion connects connection pressure respectively
Two or more first in transistor group laminates portion；And/or second electrode sheet include multiple second laminate portion and second connection
Portion, along piezoelectric element circumferentially around setting, each second portion of laminating being located on the same floor between piezo-electric crystal group is by second
Interconnecting piece connects into the cyclic structure disconnected in the circumferential；It is connected between two neighboring cyclic structure by second connecting portion.
One aspect according to the present utility model, support member include mounting hole, and mounting hole is axially extending along support member；
Connecting component includes connector and pre-tightens component, pre-tightens component and is set on connector, connector can protrude into mounting hole and bracket
Connection；It pre-tightens component to be set on connector, and the circumferential direction for pre-tightening component has multiple joint faces；Wherein, multiple piezo-electric crystals
Group is separately positioned on different joint faces.
One aspect according to the present utility model, connector include support portion and mounting portion, and mounting portion can be with support member
Connection, support portion are cone structure, and the mean radius of support portion is gradually reduced on the direction close to support member.
One aspect according to the present utility model, connector are taper self-locking screw.
One aspect according to the present utility model, pre-tightening component includes multiple preload pieces, and multiple preload pieces are along connector
Circumferentially-spaced distribution；Pre-tightening component includes the conical through-hole for penetrating through its own thickness direction, and connector is inserted into conical through-hole
In, the mean radius of conical through-hole gradually decreases on the direction close to support member.
A kind of piezoelectric acceleration sensor of the another aspect of the utility model, comprising: charge output element described above；
Shell, including accommodation space, charge output element described above are arranged in accommodation space；Signal export structure, setting exist
On shell.
In the utility model embodiment, charge output element and mass block are sheathed on connecting component, pass through piezoelectric element
Interference fit between connecting component and mass block realizes mass block, piezoelectric element and the support portion of charge output element
The fastening locking of part, also reduces when improving the rigidity of piezoelectric acceleration sensor entirety, and using under high temperature environment
The problem of stress fluctuation, and then can be improved the measurement accuracy of the piezoelectric acceleration sensor.In addition, piezoelectric element includes
Multiple piezo-electric crystal groups, multiple piezo-electric crystal groups along connecting component be provided at circumferentially spaced and multiple piezo-electric crystal groups around connection
Component is distributed in polygon, the quantity of piezo-electric crystal can be effectively increased, by being arranged in parallel multiple piezo-electric crystals, so that right
Acceleration carries out more, more effectively detection, increases the sensitivity of charge output element, and then can increase piezoelectric acceleration biography
The sensitivity of sensor.
Detailed description of the invention
Attached drawing needed in the utility model embodiment will be briefly described below, it is common for this field
For technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic perspective view of the charge output element of the utility model one embodiment；
Fig. 2 is the schematic diagram of the section structure of the utility model one embodiment charge output element；
Fig. 3 is the structural schematic diagram of the bracket of the utility model one embodiment；
Fig. 4 is the structural schematic diagram of the preload component of the utility model one embodiment；
Fig. 5 is the structural schematic diagram of the piezoelectric element of the utility model one embodiment；
Fig. 6 is the overall structure diagram of the first electrode sheet of the utility model one embodiment；
Fig. 7 is the overall structure diagram of the second electrode sheet of the utility model one embodiment；
Fig. 8 is the overall structure diagram of the mass block of the utility model one embodiment；
Fig. 9 is 900 flow chart of manufacturing method of the charge output element of the utility model one embodiment；
Figure 10 is the schematic perspective view of the piezoelectric acceleration sensor of the utility model one embodiment；
Figure 11 is the schematic diagram of the section structure of the utility model one embodiment piezoelectric acceleration sensor.
Description of symbols:
Wherein:
1- charge output element；
10- bracket；11- connecting component；111- connector；112- pre-tightens component；1121- preload piece；12- support member；
20- piezoelectric element；21- piezo-electric crystal group；211- piezo-electric crystal；22- electrode slice；221- first electrode sheet；2211-
First laminates portion；2212- first connecting portion；222- second electrode sheet；2221- second laminates portion；2222- second connecting portion；23-
Insulating trip；
30- mass block；
2- pedestal；
3- shell；
4- signal export structure；41- pin.
Specific embodiment
The feature and exemplary embodiment of the various aspects of the utility model is described more fully below, in order to keep this practical new
The objects, technical solutions and advantages of type are more clearly understood, and below in conjunction with drawings and the specific embodiments, carry out to the utility model
It is described in further detail.It should be understood that specific embodiment described herein is only configured to explain the utility model, it to be used for example
Property illustrate the principles of the present invention, be not configured as limit the utility model.In addition, the mechanism member in attached drawing is not necessarily
It is drawn to scale.For example, it may be possible to be exaggerated some structural members or area in attached drawing for other structures part or region
The size in domain, to help the understanding to the utility model embodiment.
The noun of locality of middle appearance described below is direction shown in figure, is not the tool to the utility model embodiment
Body structure is defined.In the description of the present invention, it should be noted that unless otherwise indicated, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
It, can also be indirectly connected through an intermediary to be to be connected directly.For the ordinary skill in the art, visual specific
Situation understands the concrete meaning of above-mentioned term in the present invention.
Furthermore the terms "include", "comprise" " having " or any other variant thereof is intended to cover non-exclusive inclusion,
So that not only including those elements including a series of elements structural member or component, but also including being not explicitly listed or admittedly
Some belongs to structural member, other mechanism members on component.In the absence of more restrictions, being limited by sentence " including ... "
Element, it is not excluded that include element article or equipment in there is also other identical elements.For art technology
For personnel, the utility model can be implemented in the case where not needing some details in these details.Below to reality
The description of example is applied just for the sake of better understanding to provide to the utility model by showing the example of the utility model.
The feature and exemplary embodiment of the various aspects of the utility model is described more fully below.In addition, hereinafter institute
Feature, the structure or characteristic of description can be incorporated in any suitable manner in one or more embodiments.
Fig. 1 and Fig. 2 are please referred to, Fig. 1 is the stereochemical structure signal of the charge output element of the utility model one embodiment
Figure, Fig. 2 is the schematic diagram of the section structure of the charge output element of the utility model one embodiment.The utility model embodiment
Charge output element 1 includes: bracket 10, piezoelectric element 20 and mass block 30, wherein bracket 10 includes support member 12 and setting
Connecting component 11 in support member 12；Piezoelectric element 20 is set in connecting component 11, and piezoelectric element 20 includes multiple pressures
Transistor group 21 and electrode slice 22, multiple being provided at circumferentially spaced along connecting component 11 of piezo-electric crystal group 21, multiple piezo-electric crystals
Group 21 is distributed around connecting component 11 in polygon, includes at least one piezo-electric crystal 211, multiple piezoelectricity in piezo-electric crystal group 21
The alternately laminated setting of normal direction of crystal 211 and electrode slice 22 along the circumferential surface of connecting component 11；Mass block 30 is sheathed on piezoelectricity
The outer surface of element 20 and the hanging setting above support member 12；Wherein, piezoelectric element 20 and connecting component 11, piezoelectric element
20 and mass block 30 be interference fitted, keep each piezo-electric crystal 211 in parallel by electrode slice 22 and mass block 30.
In the utility model embodiment, charge output element 1 and mass block 30 are sheathed on connecting component 11, pass through piezoelectricity
Interference fit between element 20 and connecting component 11 and mass block 30 realizes mass block 30, the piezoelectricity of charge output element 1
The fastening of element 20 and support member 12 is locked, and improves the rigidity of piezoelectric acceleration sensor entirety, and in high temperature ring
The problem of also reducing stress fluctuation when using under border, and then the measurement accuracy of the piezoelectric acceleration sensor can be improved.This
Outside, piezoelectric element 20 includes multiple piezo-electric crystal groups 21, and multiple piezo-electric crystal groups 21 are set along the circumferentially-spaced of connecting component 11
It sets and multiple piezo-electric crystal groups 21 is distributed around connecting component 11 in polygon, the quantity of piezo-electric crystal 211 can be effectively increased,
By being arranged in parallel multiple piezo-electric crystals 211, so that carrying out more, more effectively detection to acceleration, increase charge output
The sensitivity of element 1, and then the sensitivity of piezoelectric acceleration sensor can be increased simultaneously, environment resistant interference performance is stronger.
Specifically, bracket 10 is inconel, i.e. Inconel alloy, inconel can guarantee charge output member
Part 1 in the case of a high temperature elasticity modulus still in linear.As shown in figure 3, the support member 12 of bracket 10 is arranged in connecting component
11 lower sections, support member 12 are the disk class formation being arranged around connecting component 11 and the one end for being located at connecting component 11, support portion
Mounting hole is provided on part 12, mounting hole is axially extending along support member 12；Connecting component 11 can be with support portion by mounting hole
Part 12 is detachably connected, by being detachably connected for connecting component 11 and support member 12, adjustable connecting component 11 and branch
The installation site of support part part 12, and improve the reasonable structure of charge output element 1.It is understood that connecting component 11
It can be fixedly connected with support member 12, the utility model is not limited this.
Further, connecting component 11 includes including connector 111 and pre-tightening component 112, and connector 111 can protrude into installation
Kong Zhongyu bracket 10 is attached, and is pre-tightened component 112 and is set on connector 111, is pre-tightened component 112 and is surrounded connector 111 weeks
To with multiple joint faces；Wherein, multiple piezo-electric crystal groups 21 are separately positioned on different joint faces.The utility model is implemented
In example, the joint face for pre-tightening component 112 is planar structure, is provided at least one piezo-electric crystal group 21 on each joint face, can
Selection, pre-tighten the polygonized structure phase of structure and piezo-electric crystal group 21 that component 112 is circumferentially formed around connector 111
Match, i.e., is provided with a piezo-electric crystal group 21 on each joint face.
Specifically, connector 111 includes support portion and mounting portion, mounting portion can be connect with support member 12, and support portion is
The mean radius of cone structure, support portion is gradually reduced on the direction close to support member 12.It is selectable, connector 111
For taper self-locking screw, wherein one end of taper self-locking screw is provided with "-" type groove, tool easy to use carry out fastening and
Disassembly improves assembly efficiency, and the other end is provided with helicitic texture, while the mounting hole of support member 12 is provided with and helicitic texture
Matched screw thread, so that connector 111 is fastened with bracket 10 by the connection function of screw thread.
Referring to Fig. 4, pre-tightening component 112 includes multiple preload pieces 1121, week of multiple preload pieces 1121 along connector 111
To being spaced apart, pre-tightening component 112 includes the conical through-hole for penetrating through its own thickness direction, and connector 111 is inserted into taper
In through-hole, the mean radius of conical through-hole gradually decreases on the direction close to support member 12.It is selectable, pre-tighten component
112 include four preload pieces 1121, and to improve the mutual cooperation degree between each wedge block, four wedge blocks are by a monolith four
The diagonal wire cutting of side shape wedge block forms, the preload component 112 of four wedge block splicing quadrangularlies, by that will pre-tighten component
112 are arranged to independent four preload pieces 1121, when pre-tightening insertion connector 111 in the conical through-hole on component 112, by
In connector 111 and pre-tighten component 112 cooperation be pyramidal structure, therefore connector 111 during the installation process, pyramidal structure
It is gradually increased with the mating surface diameter for pre-tightening component 112, each preload piece 1121 can be made to the method far from 111 circumferential surface of connector
Extend to direction, further improve the overall offset amount for pre-tightening component 112, so that piezoelectric element 20 has bigger deformation quantity
And be further interference fitted with mass block 30, it can effectively carry out locking effect.Further, component 112 is pre-tightened in itself thickness
Degree is offered with connector 111 on direction to matched conical through-hole, and pyramidal structure is matched with conical through-hole, so that connector
111 give piezoelectric element 20 with the pressure of linear change, and piezoelectric element 20 is caused to be not easy to squeeze damage by wedge block.It may be selected
, the material of connector 111 and preload piece 1121 is Inconel alloy, can guarantee the bullet of piezoelectricity output element at high temperature
Property modulus is still in line.
Further, multiple piezo-electric crystal groups 21 are divided around connecting component 11 in quadrangle in the utility model embodiment
Cloth, i.e., there are four piezo-electric crystal groups 21 for setting in piezoelectric element 20, and between each piezo-electric crystal group 21 and connecting component 11 also
It is provided with insulating trip 23.Referring to Fig. 5, and including three piezo-electric crystals 211, each piezo-electric crystal in each piezo-electric crystal group 21
211 be chip type piezoelectric crystal 211, and the material of piezo-electric crystal 211 is ceramics, every piezo-electric crystal 211 in a thickness direction two
End is conductive layer, each piezo-electric crystal 211 by electrode slice 22 by each conductive layer connect realize piezoelectric element 20 and
Connection, while each piezo-electric crystal group 21 is insulated by insulating trip 23 and the support member 12 of bracket 10.At this point, piezoelectric element 20
In be provided with 12 piezo-electric crystals 211, sensitivity at this time is significantly improved relative to the sensitivity of single piezo-electric crystal 211,
More acurrate test can be carried out to acceleration.Setting is spaced between four piezo-electric crystal groups 21, so that piezoelectric element 20 has more
Big deformation quantity can more effectively realize interference fit.It is understood that the quantity of piezo-electric crystal group 21 can also be arranged
Be five groups, six groups or three groups, in piezo-electric crystal group 21 quantity of piezo-electric crystal 211 can also according to the demand of sensibility in practice into
Row selection, the utility model is to this without limiting.
Fig. 6 and Fig. 7 are please referred to, electrode slice includes multiple first electrode sheets 221 and at least one second electrode sheet 222, pressure
It is connect by first electrode sheet 221 and mass block 30 with the one of them of positive or negative pole between transistor 211, piezo-electric crystal
It is connect by second electrode sheet 222 with the another one of positive or negative pole between 211；Wherein, two neighboring in piezo-electric crystal group 21
The polarity on two surfaces close to each other of piezo-electric crystal 211 is identical, convenient for by laminating between two neighboring piezo-electric crystal 211
One electrode slice simultaneously draws electrode by electrode slice.It is selectable, multiple piezo-electric crystals 211 are carried out simultaneously by electrode slice
The cathode of connection, all piezo-electric crystals 211 is attached and is drawn by second electrode sheet 222, and all anodes pass through the first electricity
Pole piece 221 is communicated to mass block 30 and draws, by changing the quantity of piezo-electric crystal 211, can achieve increase or reducing spirit
The purpose of sensitivity.
One aspect according to the present utility model includes multiple piezo-electric crystals 211, first electrode sheet in piezo-electric crystal group 21
221 laminate portion 2211 and first connecting portion 2212 including first, and first laminates the phase that portion 2211 is arranged in piezo-electric crystal group 21
Between adjacent two piezo-electric crystals 211, second electrode sheet 222 laminates portion 2221 and second connecting portion 2222 including second, and second is folded
Splenium 2221 is arranged between the two neighboring piezo-electric crystal 211 in piezo-electric crystal group 21, wherein first laminates portion 2211 and
Two, which laminate portion 2221, is arranged alternately, at this point, being only laminated with first between adjacent company piezo-electric crystal 211 laminates portion 2211 or the second
Laminate one of portion 2221.First connecting portion 2212 laminates portion 2211 with first and connect, and second connecting portion 2222 and first is folded
Splenium 2211 connects, wherein the first size for laminating portion 2211 is greater than or equal to the size of piezo-electric crystal 211, so that piezo crystals
Body 211 can fit in first electrode sheet 221 completely；And/or second laminate portion 2221 size be greater than or equal to piezo-electric crystal
211 size, so that piezo-electric crystal 211 can fit in second electrode sheet 222 completely.
One aspect according to the present utility model, first electrode sheet 221 include that two or more first laminates portion 2211 and extremely
A few first connecting portion 2212, first, which laminates portion 2211, is additionally arranged between outermost piezo-electric crystal 211 and mass block 30,
First connecting portion 2212 is separately connected two or more first and laminates portion 2211, and more than two first at this time laminate 2211, portion
In in the same piezo-electric crystal group 21, i.e., first electrode sheet 221 only carries out the piezo-electric crystal 211 in piezo-electric crystal group 21 simultaneously
Join, the piezo-electric crystal 211 between piezo-electric crystal group 21 is attached by mass block 30；And/or second electrode sheet 222 is along piezoelectricity
Element 20 circumferentially around setting, second electrode sheet 222 includes multiple second laminating portion 2221 and multiple second connecting portions 2222,
Each second be located on the same floor between piezo-electric crystal group 21 laminates portion 2221 and is connected by first connecting portion 2212 in circumferential direction
The cyclic structure of upper disconnection；It is connected between two neighboring cyclic structure by second connecting portion 2222, passes through second electrode sheet 222
The cathode of multiple piezo-electric crystals 211 can be drawn, selectable, one second laminates and is provided in portion 2221 wherein
Bulge-structure can be connect by the bulge-structure with the cathode of the connector of piezoelectric acceleration sensor.
Specifically, the top of piezo-electric crystal group 21, second electrode is arranged in the first connecting portion 2212 of first electrode sheet 221
The circumferential direction of piezo-electric crystal group 21 is arranged in the second connecting portion 2222 of piece 222, can rationally utilize space, prevent first electrode sheet
221 intersect with second electrode sheet 222, are relatively beneficial to later maintenance and inspection.
Referring to Fig. 8, mass block 30 provided by the embodiment of the utility model is set on piezoelectric element 20, and mass block 30
Polygonal through hole is offered along thickness direction, the polygonal through hole is corresponding with piezo-electric crystal group 21, so that piezo-electric crystal
211 can preferably be fitted on the inner surface of mass block 30, and in the utility model embodiment, first electrode sheet 221 is by piezoelectricity
Anode connection between piezo-electric crystal 211 in crystal group 21, is arranged between outermost piezo-electric crystal 211 and mass block 30
Portion 2211 is laminated first, it is by mass block 30 that the piezo-electric crystal 211 in four piezo-electric crystal groups 21 is in parallel, to realize the
One electrode slice 221 and mass block 30 jointly connect the anode of piezo-electric crystal 211.Piezoelectric element 20 in charge output element 1
It is interference fitted between mass block 30 and the connecting component 11 of bracket 10, is not necessarily to articulamentum or glue connection, that is, piezoelectric element 20,
It is rigid contact between mass block 30 and bracket 10, is able to ascend the overall stiffness and reliability of charge output element 1, then mentions
Rise the Frequency Response and resonance of piezoelectric acceleration sensor.Simultaneously as piezo-electric crystal 211 can be carried out simultaneously on four faces
It stacks, allows sensor to possess very high sensitivity and mass block ratio, compared to traditional structure, the mass block of equivalent weight
30 can obtain higher sensitivity.
The other side of the utility model provides a kind of assembly method 900 of charge output element 1, referring to Fig. 9, should
Assembly method includes the following steps:
The support member of outer clamp and bracket is correspondingly arranged by S910.
In this step, by the way that outer clamp is corresponding with support member 12, i.e., by external jig and support member 12
Position be fixed, more stable accurate platform can be provided for the assembly of charge output element 1, and to subsequent to be assembled
Component is limited.
S920 makes the piezoelectric element around the external jig in the circumferential installation piezoelectric element of external jig
It is in polygonized structure on direction.
In this step, the periphery tool of external jig is there are four the position limiting structure on side and axial direction, in piezoelectric element 20
Four piezo-electric crystal groups 21 be separately mounted on each side of external jig, and existed to piezoelectric element 20 by position limiting structure
Position in axial direction is defined, at this point, piezoelectric element 20 is formed in the tetragonal through hole for penetrating through setting on thickness direction.
Mass block is arranged in the peripheral side of the piezoelectric element in S930.
In this step, mass block 30 is arranged above support member 12 and is vacantly arranged.
Connecting component is inserted into the piezoelectric element by S940, and makes the connecting component to the support member
It moves and connects, be interference fitted the piezoelectric element and the mass block by the connecting component.
In this step, preload piece 1121 is installed on each face of the tetragonal through hole of piezoelectric element 20, was being installed
It is to be bonded the joint face of preload piece 1121 with one of plane of piezoelectric element 20 in journey, so as to pre-tighten the formation of component 112
Conical through-hole；Then, connector 111 is inserted into conical through-hole and is connect with support member 12, for example using installation tool
Torque wrench by adjusting connector 111, locked by the locking torque for controlling connector 111.
S950 takes out external jig from charge output element.
The assembly method of charge output element 1 provided by the embodiment of the utility model is existed by using outer clamp setting
The top corresponding position of support member 12, to limiting in the axial direction for piezoelectric element 20, while by making connector 111
Make the interior table for being resisted against mass block 30 of connector 111 tightly by piezoelectric element 20 while being attached with support member 12
On face, the assembly to charge output element 1 can be completed without other articulamentums in this process.When assembling, it need to only use and turn round
Square spanner controls the pretensioning effect that the locking torque of connector can reach.This structure can make sensor by vertical
When the alternating force of pedestal 2, piezo-electric crystal 211 is by shear action, thus output charge.Due to mass block 30, piezoelectric element
20 and bracket 10 the whole rigidity of charge output element 1 can be increased using interference fit, and then be able to ascend piezoelectric acceleration
The Frequency Response and resonance of sensor.Also, piezo-electric crystal 211 parallel with one another is set on multiple faces, can be effectively improved
The measurement sensitivity of the charge output element 1.After piezoelectric material assembles, for reliability and locking, by bolt and bottom
Seat 2 welds, and destroys its screw thread pair.
The other side of the utility model provides a kind of piezoelectric acceleration sensor, exports including charge described above
Element 1 and shell 3, shell 3 include accommodation space, and lotus output element described above is arranged in accommodation space；Connector, if
It sets on shell 3.Also referring to shown in Figure 10 and Figure 11, Figure 10 is that the piezoelectric acceleration of the utility model one embodiment passes
The schematic perspective view of sensor, Figure 11 are that the cross-section structure of the piezoelectric acceleration sensor of the utility model one embodiment shows
It is intended to.The piezoelectric acceleration sensor of the present embodiment further comprises signal export structure 4.Shell 3 can be to charge output element 1
It is sealed and protects, shell 3 further includes pedestal 2, the structure triangular in shape of pedestal 2, it is possible to reduce occupied space, while pedestal 2
On be provided with mounting structure, piezoelectric acceleration sensor can be installed in equipment to be tested by mounting structure.Signal is defeated
The pin 41 of structure 4 is electrically connected with mass block 30 and piezoelectric element out, is believed specifically, can be realized by two bars transmission lines
Number export structure 4 and mass block 30, piezoelectric element are electrically connected, wherein one end of a signal line is connected to mass block 30 or the
One electrode slice 221, the other end are connected to signal export structure 4, and one end of another signal line is connected to second electrode sheet 222,
The other end is connected to signal export structure 4.Signal of charge output element 1 can be transmitted by signal export structure 4 with this
To external equipment.The material of the shell of the piezoelectric acceleration sensor of the present embodiment is Inconel alloy, so that shell is in high temperature
Under the still difficult line style and rigidity being able to maintain, so that it is guaranteed that frequency response change is small in a high temperauture environment for sensor.
It should be understood that term " first ", " second ", or the like relational terms be used merely to by an entity or operation with
Another entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this realities
The relationship or sequence on border.It is to be understood that the term so used can be interchanged in appropriate circumstances, so that this paper institute
Embodiment in the utility model of description, for example, can be according to those of being described in addition to herein described or other modes sequentially
And it works or arranges.
The utility model can be realized in other specific forms, without departing from its spirit and essential characteristics.Therefore, currently
Embodiment be all counted as being exemplary rather than in all respects limited, the scope of the utility model is wanted by appended right
Ask rather than foregoing description defines, also, fall into the meaning of claim and whole in the range of equivalent change to all by
It is included among the scope of the utility model.Also, the different technologies feature occurred in different embodiments can be combined,
To obtain beneficial effect.Those skilled in the art will be understood that simultaneously on the basis of studying attached drawing, specification and claims
Realize the embodiment of other variations of revealed embodiment.
Claims (10)
1. a kind of charge output element characterized by comprising
Bracket, including support member and the connecting component being arranged in the support member；
Piezoelectric element is set in the connecting component, and the piezoelectric element includes multiple piezo-electric crystal groups and electrode slice, multiple
Piezo-electric crystal group being provided at circumferentially spaced along the connecting component, multiple piezo-electric crystal groups are around the connecting component
It is distributed in polygon, includes at least one piezo-electric crystal, the multiple piezo-electric crystal and the electrode in the piezo-electric crystal group
Normal direction alternately laminated setting of the piece along the circumferential surface of the connecting component；
Mass block is sheathed on the outer surface of the piezoelectric element and is vacantly arranged above the support member；
Wherein, the connecting component, piezoelectric element and the mass block are mutually interference fitted, and pass through the electrode slice and the matter
Gauge block keeps each piezo-electric crystal in parallel.
2. charge output element according to claim 1, which is characterized in that the electrode slice includes multiple first electrode sheets
With at least one second electrode sheet, the piezo-electric crystal passes through the first electrode sheet and the mass block and positive or negative pole
One of them connects, and passes through the second electrode sheet between the piezo-electric crystal and the another one of positive or negative pole connects；
Wherein, the polarity on the two neighboring piezo-electric crystal two surfaces close to each other is identical in the piezo-electric crystal group.
3. charge output element according to claim 2, which is characterized in that include multiple piezoelectricity in the piezo-electric crystal group
Crystal, the first electrode sheet laminate portion and first connecting portion including first, and first portion of laminating is arranged in the piezo crystals
Between the two neighboring piezo-electric crystal in body group；Second electrode sheet includes second laminating portion and second connecting portion, and described the
Two portions of laminating are arranged between the two neighboring piezo-electric crystal in the piezo-electric crystal group, and described first laminates portion and described
Second portion of laminating is arranged alternately, and the first connecting portion is connect with first portion of laminating, the second connecting portion and described the
The connection of one portion of laminating.
4. charge output element according to claim 3, which is characterized in that the described first size for laminating portion is greater than or waits
In the size of the piezo-electric crystal, so that the piezo-electric crystal can fit in the first electrode sheet completely；And/or
Described second size for laminating portion is greater than or equal to the size of the piezo-electric crystal, so that the piezo-electric crystal can be complete
Fit in the second electrode sheet.
5. charge output element according to claim 3, which is characterized in that the first electrode sheet includes multiple described
One laminates portion and at least one described first connecting portion, first portion of laminating be additionally arranged at the outermost piezo-electric crystal with
Between the mass block, the first connecting portion connects the two or more described first in the piezo-electric crystal group respectively and laminates
Portion；And/or
The second electrode sheet includes multiple described second laminating portion and multiple second connecting portions, the second electrode sheet edge
The piezoelectric element circumferentially around setting, each second portion of laminating being located on the same floor between the piezo-electric crystal group passes through
The second connecting portion connects into the cyclic structure disconnected in the circumferential；Pass through described the between the two neighboring cyclic structure
The connection of two interconnecting pieces.
6. charge output element according to claim 1, which is characterized in that the support member includes mounting hole, described
Mounting hole is axially extending along the support member；
The connecting component includes connector and pre-tightens component, and the preload component is set on the connector, the connection
Part can protrude into the mounting hole and connect with the bracket；The preload component is set on the connector, and pre-tightens component
It is circumferential that there are multiple joint faces；
Wherein, multiple piezo-electric crystal groups are separately positioned on different joint faces.
7. charge output element according to claim 6, which is characterized in that the connector includes support portion and installation
Portion, the mounting portion can be connect with the support member, and the support portion is cone structure, and the mean radius of the support portion exists
It is gradually reduced on the direction of the support member.
8. charge output element according to claim 6, which is characterized in that the connector is taper self-locking screw.
9. charge output element according to claim 6, which is characterized in that the preload component includes multiple preload pieces,
Circumferentially-spaced distribution of multiple preload pieces along the connector；
The component that pre-tightens includes the conical through-hole for penetrating through its own thickness direction, and it is logical that the connector is inserted into the taper
The mean radius of Kong Zhong, the conical through-hole gradually decrease on the direction close to the support member.
10. a kind of piezoelectric acceleration sensor characterized by comprising
Charge output element described in claim 1 to 9 any one；
Shell, including accommodation space, the setting of charge output element described in claim 1 to 9 any one is in the receivings sky
In；
Signal export structure, setting is on the housing.
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| CN201920392967.7U CN209544396U (en) | 2019-03-26 | 2019-03-26 | Charge output element and piezoelectric acceleration sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950391A (en) * | 2019-03-26 | 2019-06-28 | 西人马（厦门）科技有限公司 | Charge output element, assembly method and piezoelectric acceleration sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109950391A (en) * | 2019-03-26 | 2019-06-28 | 西人马（厦门）科技有限公司 | Charge output element, assembly method and piezoelectric acceleration sensor |
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