EP0419661A1 - Convertisseur electroacoustique - Google Patents

Convertisseur electroacoustique Download PDF

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Publication number
EP0419661A1
EP0419661A1 EP19890909895 EP89909895A EP0419661A1 EP 0419661 A1 EP0419661 A1 EP 0419661A1 EP 19890909895 EP19890909895 EP 19890909895 EP 89909895 A EP89909895 A EP 89909895A EP 0419661 A1 EP0419661 A1 EP 0419661A1
Authority
EP
European Patent Office
Prior art keywords
electroacoustic transducer
length
elastic element
piezo
waves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19890909895
Other languages
German (de)
English (en)
Inventor
Igor Albertovich Samarin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MINSKY RADIOTEKHNICHESKY INSTITUT
Original Assignee
MINSKY RADIOTEKHNICHESKY INSTITUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MINSKY RADIOTEKHNICHESKY INSTITUT filed Critical MINSKY RADIOTEKHNICHESKY INSTITUT
Publication of EP0419661A1 publication Critical patent/EP0419661A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B06B1/0611—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 in a pile
    • B06B1/0618—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 in a pile of piezo- and non-piezoelectric elements, e.g. 'Tonpilz'

Definitions

  • the present invention relates to devices for generating mechanical ultrasonic frequency vibrations, in particular to electroacoustic transducers.
  • An electroacoustic transducer which contains two piezo elements, on the end faces of which elastic elements are attached, and has a length which is equal to an integer number of half-waves of the working length of the acoustic wave (US, A, No. 3218488).
  • the piezo elements are located in the middle of the electroacoustic transducer mentioned, i.e. in the effective zone of maximum mechanical stresses, which leads either to the destruction of piezo elements or to overheating of them as the electrical power supplied increases and the operational reliability and stability of the electroacoustic transducer to be reduced.
  • an electroacoustic transducer which contains successively arranged and contacting via its end faces: a first elastic element, a first piezo element, a second elastic element, a second piezo element and a third elastic element, the total length of which is a whole number of half-waves of the working length of the acoustic
  • the shaft is the same, the lengths of the first and third elastic elements being approximately equal to one another (GB, A, No. 1379955).
  • the elastic element arranged between the piezo elements has a length such that the distance between the centers of the piezo elements is equal to half the length of the acoustic wave.
  • the distance between the center of each piezo element and the end faces of the electroacoustic transducer mentioned is also equal to half the length of the acoustic wave.
  • the piezo elements lie in the zone of maximum mechanical stresses, which, if the electrical power supplied increases, either to destroy piezo elements or to overheat them and lower them the operational reliability and stability of the electroacoustic transducer.
  • the present invention was based on the object of providing an electroacoustic transducer in which the length of the elastic element arranged between the piezo elements is selected such that this would ensure an increase in the output power of the electroacoustic transducer while at the same time increasing its operational reliability and stability.
  • the electro-acoustic transducer contains the successively arranged and contacting via its end faces: a first elastic element, a first piezo element, a second elastic element, a second piezo element and a third elastic element, the total length of which is a whole number of half-waves the working length of the acoustic wave is the same, while the lengths of the first and third elastic elements are approximately equal to one another, according to the invention the length of the elastic element arranged between the first and the second piezo element is equal to an odd number of quarter waves of the working length of the acoustic wave.
  • the separation of the piezo elements in the electroacoustic transducer to be patented by an elastic element of a length which is equal to an odd number of quarter waves of the working length of the acoustic wave means that these piezo elements are outside the range of maximum mechanical stresses during operation, as a result of which the Output power of this electroacoustic transducer can be increased while increasing its operational reliability and stability.
  • the electroacoustic transducer according to the invention contains consecutively arranged and contacting via its end faces: an elastic element 1 (FIG. 1), a piezo element 2, an elastic element 3, a piezo element 4 and an elastic element 5, the total length of which is a whole number of half-waves of the working length is the same as the acoustic wave, ie n. ⁇ / 2, where n is an integer number of half-waves of the working wave ⁇ of the acoustic wave.
  • the lengths of the elastic elements 1 and 5 are equal to one another. However, these lengths can also differ somewhat.
  • the length of the elastic element 3 is equal to an odd number of quarter waves of the working length of the acoustic wave, i.e. it makes (2n - 1) ⁇ ⁇ / 4.
  • the piezo elements 2 and 4 are designed in the form of two piezoceramic rings 6, which have electrical connections 7, which serve as the electrical input of the electroacoustic transducer to be patented, which is connected to a source of sinusoidal AC voltage U, which in the drawing is represented in simplified form by terminals 8.
  • the elastic elements 1, 3 and 5 are designed in the form of nuts which are screwed onto a threaded pin 10 with their thread 9.
  • the elastic elements 1, 3 and 5 and the threaded pin 10 are grounded.
  • the inside diameter of the bores of the piezoceramic rings 6 forming the piezo elements 2 and 4 is larger than the diameter of the threaded pin 10, which precludes the connections 7 from being connected to the grounded elastic elements 1, 3, 5 and the threaded pin 10.
  • the end faces 11 and 12 of the respective elastic elements 1 and 5 serve as an output of the acoustic waves in the electroacoustic transducer to be patented.
  • the operation of the electroacoustic transducer according to the invention is as follows.
  • a curve 13 (FIG. 2) shows the distribution of the vibration amplitude along the electroacoustic transducer to be patented for the vibrations generated by one piezo element 2, but a curve 14 shows the same for the vibrations generated by the other piezo element 4.
  • a sum vibration occurs, the amplitude distribution of which is represented by a curve 15 in the drawing.
  • the amplitude ⁇ max of the total vibrations of the end faces 11 and 12 of the electroacoustic transducer according to the invention is twice as great as the amplitude of the vibrations which are generated separately from each of the piezo elements 2 and 4. So that's the Output of the electroacoustic transducer to be patented, the total acoustic power applied is four times larger.
  • the curves 16 (FIG. 3) and 17 show the distribution of the amplitudes of mechanical stresses that arise along the electroacoustic transducer according to the invention when vibrations generated separately from the piezo elements 2 and 4 propagate.
  • Curve 18 shows the distribution of the amplitudes ⁇ max of the total mechanical stresses along the electroacoustic transducer according to the invention.
  • the piezo elements 2 (FIG. 1) and 4 are located in an area where the mechanical stresses do not reach a maximum value. If it is assumed that ⁇ max (FIG. 3) means a threshold value of the mechanical stress at which the destruction of the piezo elements 2 and 4 occurs, it can be seen that the electrical power supplied can be increased by 0.7 times, without the piezo elements being destroyed.
  • a decrease in the mechanical stresses in the piezo elements 2 and 4 leads to a reduction in mechanical losses and thus to a lowering of the heating temperature of the piezo elements 2 and 4, which contributes to an increase in the operational reliability and stability of the electroacoustic transducer to be patented as a whole.
  • each piezo element 2 and 4 is designed in the form of two piezoceramic rings 6 with an outer diameter of 40 mm, a bore diameter of 20 mm and a thickness of 4 mm.
  • the length of the elastic elements 1 and 5 is 18 mm, the length of the elastic element 3 is 60 mm.
  • the elastic elements 1, 3, 5 are made of an aluminum alloy.
  • the speed of propagation of the mechanical waves in this alloy is 4.8.103 m / s. So the length of the elastic element is 3 ⁇ / 4.
  • the grub screw 10 is made of steel.
  • the working frequency of this converter is 20 kHz.
  • the electroacoustic transducer according to the invention ensures a fourfold increase in the output power while at the same time increasing the operational reliability and stability, which leads to an extension of the service life and a reduction in repair work for the transducer.
  • the electroacoustic transducer can be used in the technological equipment that uses the acoustic waves in the washing, soaking and welding of products of various configurations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)

Abstract

Un convertisseur électroacoustique comporte trois éléments élastiques (1, 3, 5) entre lesquels sont situés des éléments piézo-électriques (2, 4). La longueur totale de tous les éléments élastiques (1, 3, 5) et éléments piézo-électriques (2, 4) est égale à un nombre entier de demi-ondes de la longueur réelle de l'onde acoustique. Les éléments élastiques (1, 5) sont de longueur égale, tandis que la longueur des éléments élastiques (3) est égale à un nombre impair de quart d'ondes de la longueur réelle de l'onde acoustique.
EP19890909895 1989-04-18 1989-04-18 Convertisseur electroacoustique Withdrawn EP0419661A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1989/000100 WO1990012659A1 (fr) 1989-04-18 1989-04-18 Convertisseur electroacoustique

Publications (1)

Publication Number Publication Date
EP0419661A1 true EP0419661A1 (fr) 1991-04-03

Family

ID=21617449

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890909895 Withdrawn EP0419661A1 (fr) 1989-04-18 1989-04-18 Convertisseur electroacoustique

Country Status (3)

Country Link
EP (1) EP0419661A1 (fr)
JP (1) JPH03505807A (fr)
WO (1) WO1990012659A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0765637A3 (fr) * 1995-09-29 1997-10-29 Ethicon Endo Surgery Inc Appareil à ultrason utilisé en chirurgie

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU40279A1 (ru) * 1934-04-13 1934-11-30 М.Н. Созыкин Гидросилова установка на барже
GB1289501A (fr) * 1969-01-02 1972-09-20
FR2079768A5 (fr) * 1970-02-12 1971-11-12 Scotto Jean Pierre
US3689783A (en) * 1971-03-11 1972-09-05 David A Williams Ultrasonic transducer with half-wave separator between piezoelectric crystal means
SU1052278A1 (ru) * 1982-08-05 1983-11-07 Предприятие П/Я А-7555 Пьезоэлектрический преобразователь

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9012659A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0765637A3 (fr) * 1995-09-29 1997-10-29 Ethicon Endo Surgery Inc Appareil à ultrason utilisé en chirurgie
AU709756B2 (en) * 1995-09-29 1999-09-09 Ethicon Endo-Surgery, Inc. Ultrasonic instrument for surgical applications

Also Published As

Publication number Publication date
WO1990012659A1 (fr) 1990-11-01
JPH03505807A (ja) 1991-12-12

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