CN109248847A - A kind of ultrasonic transducer and end face elliptical vibration system - Google Patents
A kind of ultrasonic transducer and end face elliptical vibration system Download PDFInfo
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- CN109248847A CN109248847A CN201811212002.1A CN201811212002A CN109248847A CN 109248847 A CN109248847 A CN 109248847A CN 201811212002 A CN201811212002 A CN 201811212002A CN 109248847 A CN109248847 A CN 109248847A
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- 239000000919 ceramic Substances 0.000 claims abstract description 193
- 230000005611 electricity Effects 0.000 claims description 7
- 229910052573 porcelain Inorganic materials 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 150000001875 compounds Chemical class 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 abstract description 6
- 238000010168 coupling process Methods 0.000 abstract description 6
- 238000005859 coupling reaction Methods 0.000 abstract description 6
- 230000008602 contraction Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 15
- 230000006872 improvement Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000026683 transduction Effects 0.000 description 1
- 238000010361 transduction Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
- B06B2201/20—Application to multi-element transducer
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- Transducers For Ultrasonic Waves (AREA)
Abstract
The present invention relates to ultrasonic vibration technical field, providing a kind of ultrasonic transducer and end face elliptical ultrasonic vibration system, ultrasonic transducer includes symmetrically arranged first piezoelectric ceramic stack and the second piezoelectric ceramic stack, and the corresponding piezoelectric ceramic piece polarity of the two is opposite；The second electrode sheet one of first piezoelectric ceramic stack and the second electrode sheet one of second piezoelectric ceramic stack are symmetrical, the second electrode sheet two of first piezoelectric ceramic stack and the second electrode sheet two of second piezoelectric ceramic stack are symmetrical, so as under conditions of being passed through unlike signal, so that the second electrode sheet one of different location, the corresponding piezoelectric ceramic piece of second electrode sheet two generate corresponding contraction or expansion deformation, to form the compound of bending vibration in the end face of energy converter, and then elliptical vibration can be gone out in the end coupling of energy converter；Ultrasonic transducer is in sandwich type structural, and assembly is simple, manufacturing cost is low.
Description
Technical field
The present invention relates to ultrasonic vibration technical field more particularly to a kind of ultrasonic transducer and end face elliptical vibration systems.
Background technique
Ultrasonic elliptical vibratory is in ultrasonic motor, Ultrasonic machining, ultrasonic wave added processing, ultrasonic surgical blade, ultrasonic grinding, ultrasound
There is extensive utilization in the fields such as polishing.It needs to enable energy converter at its end using the elliptical vibration on end face in many cases
Face realization elliptical vibration, rather than axial elliptical vibration, to realize that corresponding demand, the prior art usually utilize patch type pressure
The forms such as electric transducer realize the elliptical vibration on energy converter end face, but patch is that PZT (piezoelectric transducer) assembly is complicated, manufacture
Difficulty need to guarantee that the fastness that piezoelectric ceramics is connect with main structure when fitting, cost of manufacture are high.Accordingly, it is desirable to provide one
The new technical solution of kind is to solve the above problems.
Summary of the invention
The present invention is intended to provide the ultrasonic transducer that a kind of assembly is simple, manufacturing cost is low, to realize on energy converter end face
Elliptical vibration, and provide a kind of end face elliptical vibration system with the ultrasonic transducer.
The technical proposal adopted by the invention to solve the above technical problems is that:
A kind of ultrasonic transducer is provided, including the first cover board, the second cover board and is clipped in piezoelectric ceramic stack between the two,
The first input end and the second input terminal for input stimulus electric signal are provided on the piezoelectric ceramic stack, in which: the pressure
Electroceramics heap includes symmetrically arranged first piezoelectric ceramic stack and the second piezoelectric ceramic stack, and first cover board and described second are covered
Plate is fixedly connected；First piezoelectric ceramic stack include the piezoelectric ceramic piece being stacked, first electrode sheet and in pairs and mutually
The second electrode sheet of insulation, second piezoelectric ceramic stack is identical as the first piezoelectric ceramics pile structure, and the two is corresponding
Piezoelectric ceramic piece polarity it is opposite；Each pair of second electrode sheet includes the second electrode sheet one and second electrode sheet of mutually insulated
Two；The second electrode sheet one of first piezoelectric ceramic stack and the second electrode sheet one of second piezoelectric ceramic stack are mutually right
Claim, the second electrode sheet two of first piezoelectric ceramic stack and the second electrode sheet two of second piezoelectric ceramic stack are mutually right
Claim.
As an improvement of the above technical solution, first piezoelectric ceramic stack includes piezoelectric ceramics unit, the piezoelectricity pottery
Porcelain unit includes a piece of first electrode sheet, a pair of second electrode sheet and two panels piezoelectric ceramic piece, two panels piezoelectric ceramics
Piece is respectively opposite polarity first piezoelectric ceramic piece and the second piezoelectric ceramic piece, from one end of the piezoelectric ceramics unit to another
One end is cascading the first electrode sheet, first piezoelectric ceramic piece, a pair of second electrode sheet, described second
Piezoelectric ceramic piece.
As a further improvement of the above technical scheme, first piezoelectric ceramic stack includes several groups piezoelectric ceramics list
Member, and connect with the second piezoelectric ceramic piece of one group of piezoelectric ceramics unit the side of the first electrode sheet of another group of piezoelectric ceramics unit
Formula is stacked.
As a further improvement of the above technical scheme, the piezoelectric ceramic piece and the first electrode sheet are respectively semicircle
Annular, the second electrode sheet are 1/4 circular ring shape.
As a further improvement of the above technical scheme, the position of the second electrode sheet one on first piezoelectric ceramic stack
Axial corresponding, the position of the second electrode sheet two on first piezoelectric ceramic stack is axially corresponding；Second piezoelectric ceramic stack
On second electrode sheet one position it is axially corresponding, the position of the second electrode sheet two on second piezoelectric ceramic stack is axially right
It answers.
As a further improvement of the above technical scheme, all first electrode sheet electrical connections, the second electrode sheet
One electrical connection is simultaneously electrically connected to form the first input end with the first electrode sheet, the electrical connection of second electrode sheet two and with
The first electrode sheet is electrically connected to form second input terminal.
As a further improvement of the above technical scheme, one He of the second electrode sheet in each pair of second electrode sheet
There is gap between the second electrode sheet two or separated by insulating part.
As a further improvement of the above technical scheme, the both ends of first piezoelectric ceramic stack are equipped with first electrode
Piece.
It as a further improvement of the above technical scheme, further include fixing piece, first cover board and second cover board
It is fixedly connected by the fixing piece.
Additionally provide a kind of end face elliptical vibration system, including signal generator and above-mentioned ultrasonic transducer, the letter
Number generator generates a-signal and B signal excitation signals simultaneously, and the phase difference of a-signal and B signal is φ, 0 ° of < φ <
180°；A-signal acts on the first input end on the piezoelectric ceramic stack, and B signal acts on the piezoelectric ceramic stack
Two input terminals motivate the piezoelectric ceramic piece to generate corresponding expansion or shrinkage respectively.
It as an improvement of the above technical solution, further include the first power amplifier and the second power amplifier, the a-signal
The first input end is acted on by first power amplifier, the B signal is made by second power amplifier
For second input terminal.
The beneficial effects of the present invention are:
Ultrasonic transducer of the present invention includes symmetrically arranged first piezoelectric ceramic stack and the second piezoelectric ceramic stack, and the two is corresponding
Piezoelectric ceramic piece polarity it is opposite；Second electricity of the second electrode sheet one of the first piezoelectric ceramic stack and second piezoelectric ceramic stack
Pole piece one is symmetrical, the second electrode of the second electrode sheet two of first piezoelectric ceramic stack and second piezoelectric ceramic stack
Piece two symmetrically, so as under conditions of being passed through unlike signal, so that the one, second electricity of second electrode sheet of different location
The corresponding piezoelectric ceramic piece of pole piece two generates corresponding contraction or expansion deformation, can changed according to the relevant knowledge of Lie groupoid
The end face of energy device forms the compound of bending vibration, goes out elliptical vibration so as to the end coupling in energy converter；Ultrasonic transducer is in
Sandwich type structural, assembly is simple, manufacturing cost is low.End face elliptical vibration system includes signal generator and the ultrasonic transducer,
By signal generator on piezoelectric ceramic stack first input end and the second input terminal respectively input have φ (0 ° of < φ <
180 °) a-signal, the B signal of angular phase difference, stable elliptical vibration can be formed in ultrasonic transducer end face.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing briefly describes:
Fig. 1 is the composition schematic block diagram of elliptical vibration system one embodiment in end face of the present invention；
Fig. 2 is the stereoscopic schematic diagram of ultrasonic transducer one embodiment of the present invention；
Fig. 3 is the partially exploded diagram of ultrasonic transducer one embodiment of the present invention；
Fig. 4 is the structural schematic diagram of one embodiment of the first piezoelectric ceramic stack in ultrasonic transducer of the present invention；
Fig. 5 is the structural schematic diagram of one embodiment of the second piezoelectric ceramic stack in ultrasonic transducer of the present invention；
Fig. 6 is the connection schematic diagram of piezoelectric ceramic stack one embodiment in ultrasonic transducer of the present invention；
Fig. 7 is the schematic diagram that end face elliptical vibration system of the invention carries out vibration-testing；
Fig. 8 is the ultrasonic transducer end that end face elliptical vibration system of the invention passes through that vibration-testing obtains on oscillograph
The figure of surface vibration.
Specific embodiment
It is carried out below with reference to the technical effect of 1~8 pair of design of the invention of embodiment and attached drawing, specific structure and generation
It clearly and completely describes, to be completely understood by the purpose of the present invention, feature and effect.Obviously, described embodiment is this
A part of the embodiment of invention, rather than whole embodiments, based on the embodiment of the present invention, those skilled in the art are not being paid
Other embodiments obtained under the premise of creative work out, belong to the scope of protection of the invention.In addition, involved in patent
All connection/the connection relationships arrived not singly refer to that component directly connects, and addition can be passed through according to specific implementation situation by referring to
Or couple auxiliary is reduced, to form more preferably coupling structure.The orientation such as upper and lower, left and right involved in the present invention describe only
It is relative to the position relationship of the components of the invention in the accompanying drawings.Each technical characteristic in the present invention,
It can be with combination of interactions under the premise of not conflicting conflict.
Fig. 1 is the composition schematic block diagram of elliptical vibration system one embodiment in end face of the present invention, and with reference to Fig. 1, end face is oval
Vibrational system includes signal generator 1, the first power amplifier 2, the second power amplifier 3 and ultrasonic transducer 4, ultrasonic transduction
Device 4 includes the first cover board, the second cover board and is clipped in piezoelectric ceramic stack between the two, and the first input is provided on piezoelectric ceramic stack
End 4 and the second input terminal 5, signal generator 1 generate a-signal and B signal excitation signals simultaneously, and a-signal and B signal have
The phase difference at one angle φ, 0 ° of 180 ° of < φ <；A-signal acts on the first input end 4 on piezoelectric ceramic stack 73, and B signal is made
The second input terminal 5 on piezoelectric ceramic stack, so that piezoelectric ceramic piece be motivated to carry out corresponding expansion or shrinkage, (inverse piezoelectricity is imitated
Answer), to excite the flexural resonance of energy converter, the compound of vibration generates ultrasonic transducer 4 surely in the end face of the first cover board
Fixed elliptical vibration.The structure and function of the ultrasonic transducer 4 will be explained below.First power amplifier 2 and the second power
Amplifier 3 is for carrying out power amplification to signal, and specifically, a-signal acts on piezoelectric ceramics by the first power amplifier 2
First input end 5 on heap, B signal act on the second input terminal 6 on piezoelectric ceramic stack by the second power amplifier 3.
Fig. 2 is the stereoscopic schematic diagram of ultrasonic transducer one embodiment of the present invention, and Fig. 3 is ultrasonic transducer one of the present invention
The partially exploded diagram of embodiment, with reference to Fig. 2,3, ultrasonic transducer 4 includes the first cover board 41, the second cover board 42 and folder
Piezoelectric ceramic stack 43 between, forms the ultrasonic transducer of sandwich type structural.First is provided on piezoelectric ceramic stack 43
Input terminal 5 and the second input terminal 6；Piezoelectric ceramic stack 43 includes the first piezoelectric ceramic stack 43a, the second piezoelectric ceramic stack 43b, and first
Cover board 41 is fixedly connected with the second cover board 42；First piezoelectric ceramic stack 43a and the second piezoelectric ceramic stack 43b is symmetrical arranged, and first
Piezoelectric ceramic stack 43a includes the piezoelectric ceramic piece 431 being stacked, first electrode sheet 432, pairs of and mutually insulated the second electricity
Pole piece 433 is carried out using epoxide-resin glue glued between any two；Second piezoelectric ceramic stack and the first piezoelectric ceramics pile structure phase
Together, and corresponding 431 polarity of piezoelectric ceramic piece of the two is opposite.Each pair of second electrode sheet 433 includes the second electricity of mutually insulated
Two 433b of one 433a of pole piece and second electrode sheet, between the second electrode sheet one and second electrode sheet two in each pair of second electrode sheet
It with gap to carry out electrical isolation, or is separated by insulating part, to realize insulation.
The second electrode sheet one of first piezoelectric ceramic stack and the second electrode sheet one of the second piezoelectric ceramic stack are symmetrical, the
The second electrode sheet two of one piezoelectric ceramic stack and the second electrode sheet two of the second piezoelectric ceramic stack are symmetrical.So as to logical
Under conditions of entering unlike signal, so that the second electrode sheet one of different location, the corresponding piezoelectric ceramic piece of second electrode sheet two produce
Raw corresponding contraction or expansion deformation, so as to form bending vibration in the end face of energy converter according to the relevant knowledge of Lie groupoid
Dynamic is compound, goes out elliptical vibration so as to the end coupling in energy converter.Sandwich structure is integrally formed in ultrasonic transducer 4,
Compared with the elliptical vibration ultrasonic transducer of patch type in the prior art, with assembly is simple, manufacturing cost is low, mechanical-electric coupling effect
The high advantage of rate, the elliptical vibration ultrasonic transducer assembly for solving patch type is complicated, and manufacture is difficult, and cost of manufacture is high to ask
Topic.
First cover board 41 is fixedly connected with the second cover board 42 by a fixing piece 44.In the present embodiment, which is
Bolt is provided with internal thread hole on the first cover board 41, is provided with the through-hole worn for fixing piece 44, fixing piece on the second cover board 42
44 pass through the second cover board 42 and piezoelectric ceramic stack 43, are then threaded into the internal thread hole on the first cover board 41, thus by the first lid
Plate 41, the second cover board 42 and piezoelectric ceramic stack 43 are fixedly connected.
Fig. 4 is the structural schematic diagram of one embodiment of the first piezoelectric ceramic stack in ultrasonic transducer of the present invention, and Fig. 5 is this
The structural schematic diagram of one embodiment of the second piezoelectric ceramic stack in invention ultrasonic transducer, with reference to Fig. 4,5, the present embodiment
In, the structure of the first piezoelectric ceramic stack 43a is identical with the structure of the second piezoelectric ceramic stack 43b, below with the first piezoelectric ceramic stack
It is illustrated based on 43a.
First piezoelectric ceramic stack 43a includes at least one piezoelectric ceramics unit 43a1, which includes a piece of
First electrode sheet 432, a pair of of second electrode sheet 433 and two panels piezoelectric ceramic piece 431, two panels piezoelectric ceramic piece are respectively polarity phase
Anti- the first piezoelectric ceramic piece 431a and the second piezoelectric ceramic piece 431b, from one end of piezoelectric ceramics unit to another end (with reference to figure
In direction from top to bottom) first electrode sheet that is cascading 432, the first piezoelectric ceramic piece 431a, a pair of of second electrode sheet 433
With the second piezoelectric ceramic piece 431b, multiple piezoelectric ceramics units are connected with the second piezoelectric ceramic piece 431b of one group of piezoelectric ceramics unit
The mode for connecing the first electrode sheet 432 of another group of piezoelectric ceramics unit is stacked, and is stacked on top of one another set with reference to direction in figure
It sets, first electrode sheet 432 is equipped with to improve the both ends of the first piezoelectric ceramic stack of conduction efficiency, to improve piezoelectric ceramic stack and the
Conduction efficiency between one cover board, the second cover board.First electrode sheet 432, second electrode sheet 433 can be copper sheet.
The present embodiment the first piezoelectric ceramic stack 43a and the second piezoelectric ceramic stack are respectively provided with two piezoelectric ceramics units
43a1, underlying piezoelectric ceramics unit lower section are additionally provided with a piece of first electrode sheet 432.In the present embodiment, piezoelectric ceramics
Piece 431 and first electrode sheet 432 are respectively semi-circular shape, and second electrode sheet 433 is 1/4 circular ring shape, easy to process, and settable three
Person's internal diameter having the same and outer diameter are conducive to uniformly transferring for vibration so that piezoelectric ceramic stack integrally forms a column, and
And the second electrode sheet one on two piezoelectric ceramic stacks respectively corresponds opposite one of the piezoelectric ceramic piece on two piezoelectric ceramic stacks
Half, and non-adjacent half；Second electrode sheet two on two piezoelectric ceramic stacks respectively corresponds the pressure on two piezoelectric ceramic stacks
The other half of electroceramics piece, so that motivating corresponding pressure respectively from the signal that second electrode sheet one and second electrode sheet two input
The part of electroceramics piece generates the bending vibration of orthogonal both direction, and since the a-signal of input, B signal have one
The phase difference of a angle φ (0 ° < φ < 180 °), two bending vibrations will also have phase difference, according to the relevant knowledge of Lie groupoid,
The compound of the bending vibration can go out elliptical vibration in the end coupling of energy converter, to form stable ellipse in energy converter end face
Vibration.Correspondingly, the first cover board and the second cover board of ultrasonic transducer are the column structure coaxial with piezoelectric ceramic stack, and
Settable first cover board and the outer diameter of the second cover board and the outer diameter of piezoelectric ceramic stack are same or similar, so that ultrasonic after the assembly is completed
Energy converter generally column structure.The position of one 433a of second electrode sheet on first piezoelectric ceramic stack is axially corresponding, the first pressure
The position of two 433b of second electrode sheet on electroceramics heap is axially corresponding；One 433a of second electrode sheet on second piezoelectric ceramic stack
Position it is axially corresponding, the position of two 433b of second electrode sheet on the second piezoelectric ceramic stack is axially corresponding.First piezoelectric ceramics
One 433a of second electrode sheet on heap and one 433a of second electrode sheet on the second piezoelectric ceramic stack are symmetrical, the first piezoelectricity pottery
Two 433b of second electrode sheet on porcelain heap and two 433b of second electrode sheet on the second piezoelectric ceramic stack are symmetrical.Therefore it can incite somebody to action
One 433a of second electrode sheet of two piezoelectric ceramic stacks is electrically connected and connects first electrode sheet 432, forms first input end, by the
Two electrode slices, two 433b electrical connection, and first electrode sheet 432 is connected, form the second input terminal.Certainly, piezoelectric ceramic piece, first
Electrode slice and second electrode sheet may be other shapes, such as cross section is square, the structure of regular hexagon etc..
In the present embodiment, the piezoelectric ceramic piece combination polarity of two piezoelectric ceramic stacks is on the contrary, also, the first piezoelectric ceramic stack
On second electrode sheet one and the second piezoelectric ceramic stack on second electrode sheet one it is symmetrical, the second electricity on the first piezoelectric ceramic stack
Second electrode sheet two on pole piece two and the second piezoelectric ceramic stack is symmetrical, respectively to first input end and the second input terminal input tool
Dephased two different signals may make the corresponding piezoelectric ceramics of second electrode sheet one on two piezoelectric ceramic stacks
Piece, which generates the corresponding piezoelectric ceramic piece of second electrode sheet one in opposite deformation, such as the first piezoelectric ceramic stack and generates to shrink, to be become
Shape, and the corresponding piezoelectric ceramic piece of second electrode sheet one on the second piezoelectric ceramic stack generates dilatancy, therefore makes pottery in piezoelectricity
A bending moment is generated in tile, so that entire ultrasonic transducer be excited to generate a bending vibration；Similarly, so that two piezoelectricity
The corresponding piezoelectric ceramic piece of second electrode sheet two in ceramic stack generates opposite deformation, while generating another bending moment, swashs
It sends out ultrasonic transducer and generates another bending vibration, two kinds of vibrations are compound to form elliptical vibration in energy converter end face.
In the present embodiment, the first piezoelectric ceramic stack 43a includes the piezoelectric ceramics unit 43a1 of two groups of stackings, the first piezoelectricity pottery
The both ends of porcelain heap 43a are equipped with a first electrode sheet 432, that is, include four piezoelectric ceramic pieces, 431, three first electrode sheets
432 and two pairs of second electrode sheets 433, lamination order are as follows: mono- piezoelectric ceramic piece 431- a pair of a first electrode sheet 432-
Two piezoelectric ceramic piece of first electrode sheet 432- mono- of piezoelectric ceramic piece 431- mono- of electrode slice 433- mono- 431- the second electricity of a pair
The first electrode sheet 432 of piezoelectric ceramic piece 431- mono- of pole piece 433- mono-.The first piezoelectricity is passed through by previously described fixing piece
The centre bore that each layer structure of ceramic stack, the second piezoelectric ceramic stack surrounds, thus by the first cover board, piezoelectric ceramic stack, the second cover board
It is fixedly mounted, forms sandwich energy converter, simple installation helps to reduce manufacturing cost.
Fig. 6 is the connection schematic diagram of piezoelectric ceramic stack one embodiment in ultrasonic transducer of the present invention, with reference to Fig. 6, with Fig. 3
For illustrated embodiment, the connection of piezoelectric ceramic stack such as Fig. 6, all first electrode sheets 432 are electrically connected, and are such as schemed, first electrode sheet
Cathode altogether, the first cover board and the second cover board are metalwork, and the first cover board and the second cover board are connect with first electrode sheet 432, from
And it is cathode.All one 433a of second electrode sheet electrical connection, and connect with first electrode sheet 432 (cathode) that form first defeated
Enter end 5；All two 433b of second electrode sheet electrical connections, and connect with first electrode sheet 432 (cathode) and form the second input terminal 6.
Two input terminals be total to cathode, it can be achieved that phase adjustment.The combination of piezoelectric ceramic piece 431 of first piezoelectric ceramic stack 43a and second
The polarity that the piezoelectric ceramic piece 431 of piezoelectric ceramic stack 43b is combined is opposite.First electrode sheet and second electrode on piece are respectively arranged with
Convenient for the engaging lug of connection.
By above it is found that there is the end face elliptical vibration system of above-mentioned ultrasonic transducer 4, by piezoelectric ceramic stack 43
First input end 5 and the second input terminal 6 input a-signal, B signal with φ (0 ° of 180 ° of < φ <) angular phase difference respectively,
Since the frequency of A, B signal is consistent with the energy converter generation frequency of bending vibration, the inverse piezoelectric effect based on piezoelectric ceramics
Excite the flexural resonance of energy converter.Using the bending vibration of orthogonal both direction, and due to the a-signal of input, B signal
Phase difference with an angle φ (0 ° < φ < 180 °), two bending vibrations will also have phase difference, according to the phase of Lie groupoid
Knowledge is closed, the compound of the bending vibration can go out elliptical vibration in the end coupling of energy converter, i.e., so that the first cover board end face generates
Radial elliptic motion is realized oval by adjusting the a-signal of input, the size of B signal voltage value or adjustment φ angular phase difference
The adjustment of track carries out input setting according to specific needs, and required end face elliptical vibration can be obtained.
The end face elliptical vibration generated when end face elliptical vibration system of the invention works in ultrasonic transducer end face, can lead to
It crosses experiment to be tested, Fig. 7 is the schematic diagram that end face elliptical vibration system of the invention carries out vibration-testing, and Fig. 8 is this
The figure for the ultrasonic transducer end face vibration that the end face elliptical vibration system of invention is obtained on oscillograph by vibration-testing, together
When refer to Fig. 7,8, by schematic diagram shown in Fig. 7 to end face elliptical vibration system carry out vibration-testing, wherein by first swash
Optical generator 71 detects 4 end face of ultrasonic transducer in the vibration in the direction y, and the vibration signal in the direction y is inputted the first vibration measuring
Instrument 73, while ultrasonic transducer 4 is detected in the vibration in the direction x with second laser generator 72, and by the vibration signal in the direction x
Input the second vialog 74, two vialogs output signal to oscillograph 75 simultaneously, thus obtain 4 end face of ultrasonic transducer x,
The elliptical orbit model that the vibration of y both direction is compounded to form.First laser generator 71 and second laser generator 72 are normal
The doppler laser of rule, the first vialog 73 and the second vialog 74 are conventional Doppler vibrometer.Fig. 8, which is shown, to be worked as
When the sine voltage signal that the voltage signal input phase difference φ of the end face elliptical vibration system is 60 °, 4 end face of ultrasonic transducer
Elliptical trajectory, the elliptical trajectory figure shown on oscillograph with x, y mode.
To sum up, ultrasonic transducer structures of the invention are simple, and symmetrical sandwich piezoelectric ceramic stack is at work,
Piezoelectric ceramic piece is constantly in pressured state, so that output is stablized, helps to improve the stability of vibrational system, is formed stable
End face elliptical orbit.End face elliptical vibration system with the ultrasonic transducer, by the first input on piezoelectric ceramic stack
End and the second input terminal input a-signal, B signal with φ (0 ° of 180 ° of < φ <) angular phase difference respectively, can change in ultrasound
Energy device end face forms stable elliptical vibration.
It above are only presently preferred embodiments of the present invention, but the present invention is not restricted to above-described embodiment, be familiar with this field
Technical staff can also make a variety of equivalent deformation or replacement on the premise of without prejudice to spirit of the invention, these equivalent deformations
Or replacement is all included in the scope defined by the claims of the present application.
Claims (11)
1. a kind of ultrasonic transducer, it is characterised in that: including the first cover board, the second cover board and be clipped in piezoelectric ceramics between the two
Heap is provided with first input end and the second input terminal for input stimulus electric signal on the piezoelectric ceramic stack, in which:
The piezoelectric ceramic stack includes symmetrically arranged first piezoelectric ceramic stack and the second piezoelectric ceramic stack, first cover board and
Second cover board is fixedly connected；
First piezoelectric ceramic stack include the piezoelectric ceramic piece being stacked, first electrode sheet and in pairs and mutually insulated the
Two electrode slices, second piezoelectric ceramic stack is identical as the first piezoelectric ceramics pile structure, and the corresponding piezoelectricity pottery of the two
Tile polarity is opposite；
Each pair of second electrode sheet includes the second electrode sheet one and second electrode sheet two of mutually insulated；The first piezoelectricity pottery
The second electrode sheet one of porcelain heap and the second electrode sheet one of second piezoelectric ceramic stack are symmetrical, first piezoelectric ceramics
The second electrode sheet two of heap and the second electrode sheet two of second piezoelectric ceramic stack are symmetrical.
2. ultrasonic transducer according to claim 1, it is characterised in that: first piezoelectric ceramic stack includes piezoelectric ceramics
Unit, the piezoelectric ceramics unit include a piece of first electrode sheet, a pair of second electrode sheet and two panels piezoelectric ceramics
Piece, two panels piezoelectric ceramic piece are respectively opposite polarity first piezoelectric ceramic piece and the second piezoelectric ceramic piece, are made pottery from the piezoelectricity
One end of porcelain unit to the other end is cascading the first electrode sheet, first piezoelectric ceramic piece, a pair of described the
Two electrode slices, second piezoelectric ceramic piece.
3. ultrasonic transducer according to claim 2, it is characterised in that: first piezoelectric ceramic stack includes several groups pressure
Electroceramics unit, and with the second piezoelectric ceramic piece of one group of piezoelectric ceramics unit connect another group of piezoelectric ceramics unit first electricity
The mode of pole piece is stacked.
4. ultrasonic transducer according to claim 1, it is characterised in that: the piezoelectric ceramic piece and the first electrode sheet
Respectively semi-circular shape, the second electrode sheet are 1/4 circular ring shape.
5. ultrasonic transducer according to claim 3, it is characterised in that: the second electrode on first piezoelectric ceramic stack
The position of piece one is axially corresponding, and the position of the second electrode sheet two on first piezoelectric ceramic stack is axially corresponding；Described second
The position of second electrode sheet one on piezoelectric ceramic stack is axially corresponding, the second electrode sheet two on second piezoelectric ceramic stack
Position is axially corresponding.
6. ultrasonic transducer according to claim 1, it is characterised in that: all first electrode sheet electrical connections, it is described
Second electrode sheet one is electrically connected and is electrically connected to form the first input end, the second electrode sheet two with the first electrode sheet
It is electrically connected and is electrically connected to form second input terminal with the first electrode sheet.
7. ultrasonic transducer according to claim 1, it is characterised in that: described second in each pair of second electrode sheet
There is gap between electrode slice one and the second electrode sheet two or separated by insulating part.
8. ultrasonic transducer according to claim 1, it is characterised in that: the both ends of first piezoelectric ceramic stack are equipped with
First electrode sheet.
9. ultrasonic transducer according to claim 1, it is characterised in that: it further include fixing piece, first cover board and institute
The second cover board is stated to be fixedly connected by the fixing piece.
10. a kind of end face elliptical vibration system, it is characterised in that: including any one of signal generator and claim 1~9 institute
The ultrasonic transducer stated, the signal generator generate a-signal and B signal excitation signals simultaneously, a-signal and B signal
Phase difference is φ, 0 ° of 180 ° of < φ <；A-signal acts on described on the piezoelectric ceramic stack by the first input end
Two electrode slices one, B signal act on the second electrode sheet two on the piezoelectric ceramic stack by second input terminal, point
The corresponding piezoelectric ceramic piece is not motivated to generate corresponding expansion or shrinkage deformation.
11. elliptical vibration system in end face according to claim 10, it is characterised in that: further include the first power amplifier and
Second power amplifier, the a-signal act on the first input end, the B signal by first power amplifier
Second input terminal is acted on by second power amplifier.
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| CN114986266A (en) * | 2022-07-04 | 2022-09-02 | 湘潭大学 | Cutting edge passivation device |
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