CN102728536B - Ultrasonic transducer - Google Patents
Ultrasonic transducer Download PDFInfo
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- CN102728536B CN102728536B CN201210234735.1A CN201210234735A CN102728536B CN 102728536 B CN102728536 B CN 102728536B CN 201210234735 A CN201210234735 A CN 201210234735A CN 102728536 B CN102728536 B CN 102728536B
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- ultrasonic transducer
- electrode flange
- flange dish
- electrode
- piezoelectric patches
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Abstract
The invention discloses an ultrasonic transducer which comprises a front end cover, a rear end cover, a piezoelectric group piece and a metal electrode, wherein the piezoelectric group piece comprises at least one pair of two piezoelectric pieces which have opposite polarization directions, and the piezoelectric group piece is fixed between the front end cover and the rear end cover; the piezoelectric group piece is internally provided with an earthed electrode flange disc, and electrode flange disc is positioned on the maximum stress section in a shaft direction when the ultrasonic transducer is under the resonant frequency; and the upper and lower surfaces of the electrode flange disc are respectively mutually contacted with one piezoelectric piece, and the electrode flange disc is provided with a heat rejection structure. The ultrasonic transducer provided by the invention can enable the electrode flange disc provided with the heat rejection structure to be arranged on the stress maximal section when the whole transducer vibrates, thereby achieving the purpose that the power density of the ultrasonic transducer is promoted; and meanwhile, the maximum output power of the ultrasonic transducer is also improved through the structure, and the service life of the ultrasonic transducer is prolonged on the premise of guaranteeing the high output power.
Description
Technical field
The present invention relates to a kind of ultrasonic transducer, belong to piezo technology, MEMS technical field.
Background technology
The world today, along with industrial fast development, large scale industry equipment enterprise constantly increases the demand of high power altrasonic transducer, for example ultrasonic cleaning and ultra-sonic welded in power ultrasonic field, and they have brought into play extremely important effect in production and assembling link.Yet, raising along with power, the caloric value of piezoelectric patches increases sharply, the heat that traditional transducer produces while working under high-power state can not get effectively transmitting, and the temperature of piezoelectric patches will constantly rise, thereby causes the decline of whole ultrasonic transducer performance, in serious situation, (for example temperature asymptotic Curie temperature on piezoelectric patches) transducer can be entirely ineffective, thereby affect the reliability of whole system, even cause equipment fault, cause catastrophic consequence.Therefore, for fear of the system failure, ultrasonic transducer cannot reach peak power output, also can think that peak power output is lower.How to design and increase the peak power output of PZT (piezoelectric transducer), stablize the service behaviour of high power altrasonic transducer, extend the service life of system, the problems such as reliability that improve equipment become key technical problem urgently to be resolved hurrily.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, and a kind of ultrasonic transducer having is provided, continuous operation under the condition that it can be exported in its peak power output, and extend its service life.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of ultrasonic transducer, comprise drive end bearing bracket, rear end cap, piezoelectricity group sheet, and metal electrode, described piezoelectricity group sheet comprises two piezoelectric patches that at least one pair of polarised direction is contrary, described piezoelectricity group sheet is fixed between drive end bearing bracket and rear end cap, between described piezoelectricity group sheet and drive end bearing bracket, between piezoelectricity group sheet and rear end cap, be provided with described metal electrode, it is characterized in that: the electrode flange dish that is also provided with a ground connection in described piezoelectricity group sheet, this electrode flange dish is positioned at ultrasonic transducer under resonant frequency on its axial maximum stress cross section, the upper and lower surface of this electrode flange dish contacts with a piezoelectric patches respectively, on described electrode flange dish, be provided with radiator structure.
Ring flange ground connection can make liquid flow through or other heat abstractors mounted thereto and do not affect its electric property, the upper and lower surface of electrode flange dish contacts with a piezoelectric patches respectively, thereby apply electric field between two piezoelectric patches, and by electrode flange dish ground connection.Ultrasonic transducer its axial maximum stress cross section under resonant frequency is the inherent feature of transducer, and its particular location depends on material and the structure thereof of transducer, and changes with the variation of frequency, and it can obtain by dynamics simulation or vibration measurement.
The external diameter of electrode flange dish is greater than the external diameter of piezoelectric patches, and described radiator structure is arranged on the surface that electrode flange dish protrudes from piezoelectric patches.
Described radiator structure is the fin being fixed on electrode flange dish.
Described radiator structure is the intake chute being opened on electrode flange dish, and intake chute has inlet and liquid outlet.
The electrode flange dish of transducer of the present invention is because external diameter is greater than the external diameter of piezoelectric patches, and it descends ground connection in working order simultaneously, so radiator structure can be mounted thereto; For making ring flange in axial maximum stress cross section, simultaneously again because piezoelectricity group sheet need to produce maximum oscillation power, therefore the upper and lower surface of electrode flange dish contacts with a piezoelectric patches respectively, and on two piezoelectric patches, it is to apply electric field, and electrode flange dish ground connection applied to 0 current potential; The both sides of piezoelectricity group sheet are connection metal electrode all, and upper and lower two surface of metal electrode connect respectively drive end bearing bracket and rear end cap; Whole equipment applies pretightning force by screw or bolt drive end bearing bracket, rear end cap, metal electrode, electrode flange dish and piezoelectricity group sheet is tightened together.In addition,, for heat radiation type structure, some fin are arranged on the upper and lower surface of heat sink electrodes ring flange; For liquid-cooled structure, intake chute cover plate is fixed on the groove top of slot type electrode flange dish, plays the effect that forms cooling fluid circulation passage with ring flange groove.
Compared with prior art, the present invention has the characteristic of displacement node while utilizing ultrasonic transducer vibration, the section of its stress maximum when the electrode flange dish that radiator structure is installed is arranged in to whole transducer vibrations, in order to improve the peak power output of transducer, and significantly reduce the high temperature that ultrasonic transducer produces under high power work state, reach the object of stablizing ultrasonic transducer output performance under high power work state.Meanwhile, by said structure, can guarantee, under the prerequisite of high-power transducer high-output power, to increase the service life of ultrasonic transducer.
Accompanying drawing explanation
Fig. 1 is the structural representation of first embodiment of the invention (heat radiation type);
Fig. 2 is the front view of Fig. 1.
Fig. 3 is the structural representation (intake chute cover plate is not shown) of second embodiment of the invention (liquid-cooled).
Fig. 4 is the front view after Fig. 3 assembles.
Number in the figure title:
1: rear end cap; 2: screw screw or bolt; 3: fin; 4: metal electrode; 5: piezoelectricity group sheet; 6: electrode flange dish; 7: drive end bearing bracket; 8: intake chute cover plate.
The specific embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is elaborated.
A kind of ultrasonic transducer of the present invention, comprise drive end bearing bracket, rear end cap, piezoelectricity group sheet, and metal electrode, piezoelectricity group sheet comprises two piezoelectric patches that at least one pair of polarised direction is contrary, piezoelectricity group sheet is fixed between drive end bearing bracket and rear end cap, between piezoelectricity group sheet and drive end bearing bracket, the metal electrode being provided with between piezoelectricity group sheet and rear end cap, in piezoelectricity group sheet, be also provided with the electrode flange dish of a ground connection, this electrode flange dish is positioned on ultrasonic transducer maximum stress cross section, this electrode flange dish is between two paired piezoelectric patches, on electrode flange dish, be provided with radiator structure, radiator structure can adopt structure and the liquid-cooled structure of heat radiation type, usining heat radiation type and liquid cooling below launches as two embodiment.
Embodiment mono-
As shown in Figure 1 and Figure 2, be a kind of concrete enforcement structure of heat radiation type high power density type ultrasonic transducer provided by the invention, comprise that 5,1 of 6,1 piezoelectricity group sheet of 4,1 electrode flange dish of 1,2 metal electrodes of 7,1 rear end cap of 1 drive end bearing bracket screws screw or bolt and some fin 3 and forms.Wherein piezoelectricity group sheet consists of 2 piezoelectric patches, and metal electrode 4 adopts sheet metal, introduces respectively below.
Drive end bearing bracket 7 and rear end cap 1 are made into integration by aluminum alloy materials, for cylindrical.Thick 25 mm of drive end bearing bracket, inside having the degree of depth is that 15mm diameter is the internal thread hole of M16; Meanwhile, for ease of screw or bolt, apply pretightning force, drive end bearing bracket both sides have the holding tank that width is 12 mm.The external diameter of rear end cap and internal diameter are respectively 40 mm and 17 mm.The material of 2 piezoelectric patches is PZT8, and external diameter is 40 mm, internal diameter 17 mm, thickness 6 mm.Piezoelectric patches is arranged in the upper and lower surface of electrode flange dish; During assembling, the polarised direction of 2 piezoelectric patches is contrary.The opposite side of piezoelectric patches contacts with metal electrode 4, and metal electrode material is copper, and external diameter is 40 mm, internal diameter 17 mm, thickness 0.2 mm.Electrode flange dish 6 materials are copper, and external diameter is 100 mm, and internal diameter is 17 mm, and thickness is 0.5mm, have the aperture that some diameters are 3 mm on it, in order to assemble fin 3.Distance between 3 two endoporus of fin is 15 mm, is highly 20 mm, and width is 0.2 mm, and material is copper or the good metal of other thermal conductivity, by screw or bolt, it is arranged on electrode flange dish 6 successively.Drive end bearing bracket 7, rear end cap 1, thin metal electrode 4, piezoelectricity group sheet 2, electrode flange dish 6 are installed together by assemble sequence shown in Fig. 1 by bolt or screw 2, and bolt or screw work to apply pretightning force.
During work, this structural parameters size can guarantee that electrode flange dish 6 is positioned at the position, stress maximum cross-section of whole ultrasonic transducer.On 2 metal electrodes 4, apply identical driving voltage, during electrode flange dish 6 ground connection, drive end bearing bracket acoustic radiation face produces axial vibration under resonant frequency, emittance.When I/O the increase of output power, the heat that piezoelectric patches produces enters a large amount of thermal energy conduction in air by heat sink electrodes ring flange and the some fin on it, reaches the object of stablizing ultrasound transducer system operating temperature.Because electrode flange dish 6 is installed in the position, stress maximum cross-section of whole ultrasonic transducer, so it can make the power virtual value of transducer reach maximum, can significantly reduce the temperature rise that piezoelectric patches produces when high power work again simultaneously, the final peak power output that improves transducer, the output performance of systems stabilisation, and extend service life of ultrasonic transducer.
Embodiment bis-
As shown in Figure 3, Figure 4, it is a kind of concrete enforcement structure of liquid-cooled high power density type ultrasonic transducer provided by the invention, comprise 1 drive end bearing bracket, 1 rear end cap, 2 metal electrodes, 1 electrode flange dish, 2 piezoelectric patches, 1 screw screw or bolt, and 1 intake chute cover plate.Introduce respectively below.
Drive end bearing bracket 7 and rear end cap 1 are made into integration by aluminum alloy materials, for cylindrical.Thick 25 mm of drive end bearing bracket 7, inside having the degree of depth is that 15mm diameter is the internal thread hole of M16; Meanwhile, for ease of screw or bolt, apply pretightning force, drive end bearing bracket both sides have the holding tank that width is 12 mm.The external diameter of rear end cap and internal diameter are respectively 40 mm and 17 mm.The material of 2 piezoelectric patches is PZT8, and external diameter is 40 mm, internal diameter 17 mm, thickness 6 mm.Piezoelectric patches is arranged in the upper and lower surface of heat sink electrodes ring flange; During assembling, the polarised direction of 2 piezoelectric patches is contrary.The opposite side of piezoelectric patches and metal electrode 4 joints, metal electrode external diameter is 40 mm, internal diameter 17 mm, thickness 0.2 mm, material is copper.Electrode flange dish 6 materials are copper, and external diameter is 66 mm, and internal diameter is 17 mm, and thickness is 1.5mm, and on it, having external diameter is 62 mm, and internal diameter is 56 mm, and the degree of depth is the annular groove of 1 mm, and cooling fluid can be circulated therein.Intake chute cover plate 8 is fixed on intake chute top by marine glue or screw in compression (adding sealing ring), with the liquid communication passage of a sealing of groove electrode flange dish 6 formation.Drive end bearing bracket 7, rear end cap 1, metal electrode 4, piezoelectricity group sheet 5, electrode flange dish 6 are installed together by assemble sequence shown in Fig. 3 by bolt or screw 2, and bolt or screw work to apply pretightning force.
During work, this structural parameters size can guarantee that electrode flange dish 6 is positioned at the position, stress maximum cross-section of whole ultrasonic transducer.On 2 metal electrodes 4, apply identical driving voltage, during electrode flange dish 6 ground connection, drive end bearing bracket acoustic radiation face produces axial vibration under resonant frequency, emittance.When I/O the increase of output power, the heat that piezoelectric patches produces is taken away by cooling fluid on heat sink electrodes ring flange, thereby reaches the object of stablizing ultrasound transducer system operating temperature.Because electrode flange dish 6 is installed in the position, stress maximum cross-section of whole ultrasonic transducer, so it can make the power virtual value of transducer reach maximum, can significantly reduce the temperature rise that piezoelectric patches produces when high power work again simultaneously, the final peak power output that improves transducer, the output performance of systems stabilisation, and extend service life of ultrasonic transducer.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection domain of the present invention.
Claims (4)
1. a ultrasonic transducer, comprise drive end bearing bracket, rear end cap, piezoelectricity group sheet, and metal electrode, described piezoelectricity group sheet comprises the piezoelectric patches that at least one pair of polarised direction is contrary, each of the piezoelectric patches of each polarised direction, every pair amounts to two piezoelectric patches, described piezoelectricity group sheet is fixed between drive end bearing bracket and rear end cap, between described piezoelectricity group sheet and drive end bearing bracket, between piezoelectricity group sheet and rear end cap, be provided with described metal electrode, it is characterized in that: the electrode flange dish that is also provided with a ground connection in described piezoelectricity group sheet, this electrode flange dish is positioned at ultrasonic transducer under resonant frequency on its axial maximum stress cross section, this electrode flange dish upper and lower surface contact with a piezoelectric patches respectively, on described electrode flange dish, be provided with radiator structure.
2. ultrasonic transducer according to claim 1, is characterized in that: the external diameter of described electrode flange dish is greater than the external diameter of piezoelectric patches, and described radiator structure is arranged on the surface that electrode flange dish protrudes from piezoelectric patches.
3. ultrasonic transducer according to claim 1 and 2, is characterized in that: described radiator structure is the fin being fixed on electrode flange dish.
4. ultrasonic transducer according to claim 1 and 2, is characterized in that: described radiator structure is the intake chute being opened on electrode flange dish, and this intake chute has inlet and liquid outlet.
Priority Applications (1)
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CN201210234735.1A CN102728536B (en) | 2012-07-09 | 2012-07-09 | Ultrasonic transducer |
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CN201210234735.1A CN102728536B (en) | 2012-07-09 | 2012-07-09 | Ultrasonic transducer |
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CN102728536A CN102728536A (en) | 2012-10-17 |
CN102728536B true CN102728536B (en) | 2014-08-13 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2016162855A1 (en) * | 2015-04-10 | 2016-10-13 | Koninklijke Philips N.V. | Systems, methods, and apparatuses for active thermal management of ultrasound transducers |
Families Citing this family (5)
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CN104549977A (en) * | 2013-10-28 | 2015-04-29 | 必能信超声(上海)有限公司 | Ultrasonic transducer |
CN104096695B (en) * | 2014-07-17 | 2016-01-20 | 陕西师范大学 | A kind of phased array supersonic washer |
CN108906559B (en) * | 2018-07-12 | 2023-11-28 | 四川大学 | Heat dissipation type electrode plate for ultrasonic transducer |
CN111570244A (en) * | 2020-05-06 | 2020-08-25 | 盈甲医疗器械制造(上海)有限公司 | Ultrasonic transducer of ultrasonic surgical instrument and ultrasonic surgical instrument thereof |
CN113457956A (en) * | 2021-06-16 | 2021-10-01 | 杭州电子科技大学 | High-power sandwich type piezoelectric transducer cooling system and cooling method thereof |
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US5595328A (en) * | 1994-12-23 | 1997-01-21 | Kulicke And Soffa Investments, Inc. | Self isolating ultrasonic transducer |
US6871770B2 (en) * | 2001-10-01 | 2005-03-29 | Asm Assembly Automation Limited | Ultrasonic transducer |
CN2853195Y (en) * | 2005-09-17 | 2007-01-03 | 陈国超 | High power altrasonic transducer |
WO2008024923A2 (en) * | 2006-08-25 | 2008-02-28 | Eilaz Babaev | Portable ultrasound device for the treatment of wounds |
CN101777506B (en) * | 2009-12-29 | 2012-06-27 | 天津大学 | Complex frequency sandwich structure ultrasonic transducer |
JP2012210576A (en) * | 2011-03-31 | 2012-11-01 | Honda Electronic Co Ltd | Ultrasonic transducer |
CN102513285A (en) * | 2011-12-12 | 2012-06-27 | 深圳职业技术学院 | Ultrasonic transducer |
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WO2016162855A1 (en) * | 2015-04-10 | 2016-10-13 | Koninklijke Philips N.V. | Systems, methods, and apparatuses for active thermal management of ultrasound transducers |
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