EP0342446A2 - Dispositif à ultrasons - Google Patents

Dispositif à ultrasons Download PDF

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Publication number
EP0342446A2
EP0342446A2 EP89108097A EP89108097A EP0342446A2 EP 0342446 A2 EP0342446 A2 EP 0342446A2 EP 89108097 A EP89108097 A EP 89108097A EP 89108097 A EP89108097 A EP 89108097A EP 0342446 A2 EP0342446 A2 EP 0342446A2
Authority
EP
European Patent Office
Prior art keywords
sound
liquid
retaining ring
ultrasonic
emitting
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.)
Granted
Application number
EP89108097A
Other languages
German (de)
English (en)
Other versions
EP0342446B1 (fr
EP0342446A3 (en
Inventor
Martin Walter
Dieter Weber
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.)
Martin Walter Ultraschalltechnik GmbH
Original Assignee
Martin Walter Ultraschalltechnik GmbH
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 Martin Walter Ultraschalltechnik GmbH filed Critical Martin Walter Ultraschalltechnik GmbH
Priority to AT89108097T priority Critical patent/ATE93752T1/de
Publication of EP0342446A2 publication Critical patent/EP0342446A2/fr
Publication of EP0342446A3 publication Critical patent/EP0342446A3/de
Application granted granted Critical
Publication of EP0342446B1 publication Critical patent/EP0342446B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency

Definitions

  • the invention relates to a device for introducing ultrasonic vibrations into a liquid by means of ultrasonic vibrators, which are arranged on the bottom (of the wall) of a liquid container and, as a lambda / 2 vibrator, consist of two piezoelectric plates oscillating in push-pull, one of which are connected on the one hand with a sound-emitting cone and on the other hand with a counterweight.
  • Devices of this type are required in particular for ultrasonic cleaning, the high tensile and compressive forces occurring in an ultrasound-excited liquid bath, in particular the mechanism of cavitation, effecting very good cleaning of the immersed workpieces.
  • the introduction of the ultrasonic vibrations is effected in known devices of this type in that the ultrasonic vibrators are glued with their sound-emitting cone onto a wall or the bottom of such a liquid container and thereby set this wall or the bottom into vibrations which in turn apply these vibrations the liquid passes on.
  • Such cleaning baths have proven particularly useful for workpieces of complex shapes, but are also used with advantage in precision mechanical units.
  • the workpieces to be cleaned or the workpieces on which the ultrasonic vibrations are supposed to act are only exposed to these ultrasonic vibrations for a short period of time.
  • the cavitation effect can therefore be metered through this period.
  • this does not apply to the wall of the liquid container, which is constantly exposed to cavitation.
  • This leads to "cavitation pitting", which leads to the container wall becoming leaky after some time.
  • the cavitation pitting is of course particularly noticeable on the wall on which the ultrasound transmitter is attached.
  • This wall acts as a sound-transmitting membrane, so it must transmit all the forces that ultimately lead to cavitation.
  • moisture reaches the ultrasound transducers glued to the wall, which loosens these ultrasound transducers and thus destroys the system.
  • a thicker membrane which would delay this cavitation pitting, cannot be used, since with the thickness of the membrane, the sound output or the efficiency of the entire device decreases significantly.
  • the object of the invention is to provide a device which avoids this cavitation pitting on the liquid container walls or the membrane. This is achieved in the manner according to the invention in that the ultrasonic vibrators are held by means of a retaining ring which is connected near the piezoelectric plate to the sound-emitting cone and that they are held by means of this retaining ring are inserted into the liquid container directly or via a sleeve surrounding the counterweight.
  • the ultrasonic transmitters with their sound-emitting cone glued to a wall, the membrane, of the liquid container, but they are inserted into the liquid container so that the sound-emitting cone protrudes directly into the liquid.
  • the cavitation that then naturally occurs will now not remove the membrane or the wall of the liquid container, but the sound-emitting cone.
  • the sound-emitting cone is made of solid metal, so that the abrasion caused by the cavitation on the sound-emitting cone is negligible in practice.
  • This special mounting of the ultrasound transmitter is possible in that an oscillation node is formed in the piezoelectric plates with the oscillation amplitude zero; the maximum vibration amplitude results from the front surface of the sound-emitting cone.
  • the retaining ring is attached to the base of the sound-emitting cone, where it lies against the piezoelectric plate, then this retaining ring is still close to the node, i.e. at a point where the sound-emitting cone is only with ge ringer vibration amplitude vibrates. This retaining ring is thereby also caused to vibrate, but with a very slight amplitude, so that there is hardly any fear of cavitation. However, the desired sound transmission to the liquid is practically not impaired, since this now takes place directly via the sound-emitting cone.
  • the sound-emitting cone is made of corrosion-resistant material.
  • the ultrasonic transducer can be inserted in the manner according to the invention in that the sound-emitting cone, as prescribed by the invention, is inserted near the piezoelectric plate into the container wall, which then serves as a "holder", or is welded to the container wall at this point.
  • a retaining ring that has already been welded to the sound-emitting cone can also be welded into the container wall, as part of this wall.
  • the retaining ring can also be made in one piece with the sound-emitting cone.
  • the counterweight is surrounded by a sleeve which can be closed by a bottom on the underside except for an opening for the transducer feed lines.
  • This provides a device that can be screwed onto the inner wall of the liquid container by a screw connection that seals at the bottom, so that the entire ultrasonic oscillator is sealed in the liquid and can act directly on the liquid.
  • This device also has the advantage that if one of the ultrasonic transducers fails, this transducer can be easily replaced.
  • Encapsulating the entire ultrasonic transducer has yet another advantage. It is now possible to let the sound-emitting cones protrude into the liquid container to different extents, thereby preventing standing waves from forming in the liquid. This is particularly the case if, according to a further feature of the invention, the end faces of the sound-emitting cones are each immersed in the liquid with a difference of lambda / 4. "Dead zones" that are not exposed to sound are definitely avoided in this way.
  • a retaining ring (7) is screwed onto the sound-emitting cone (5), which is used to insert the ultrasonic vibrator into a liquid container.
  • This retaining ring can be welded into the ultrasonic container or otherwise attached to it so that the sound-emitting cone (5) protrudes into the liquid.
  • Fig. 2 shows the same transducer inserted in a sleeve (8).
  • the same fastening of the sound-emitting cone (5) can be found by means of a comprehensive retaining ring (17), which in this illustration is integrally connected to the bushing (8).
  • the bushing (8) encloses the entire remaining part of the ultrasonic vibrator and is closed on the underside by a base (9) with a screw connection (10).
  • the screw connection (10) not only feeds the leads to the ultrasonic vibrator, it also fixes the entire ultrasonic vibrator to the inside of the container with the interposition of a seal.
  • the transducer can also be easily replaced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Surgical Instruments (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Gloves (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
EP89108097A 1988-05-14 1989-05-05 Dispositif à ultrasons Expired - Lifetime EP0342446B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89108097T ATE93752T1 (de) 1988-05-14 1989-05-05 Ultraschall-vorrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3816567A DE3816567A1 (de) 1988-05-14 1988-05-14 Ultraschall-vorrichtung
DE3816567 1988-05-14

Publications (3)

Publication Number Publication Date
EP0342446A2 true EP0342446A2 (fr) 1989-11-23
EP0342446A3 EP0342446A3 (en) 1990-08-22
EP0342446B1 EP0342446B1 (fr) 1993-09-01

Family

ID=6354419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89108097A Expired - Lifetime EP0342446B1 (fr) 1988-05-14 1989-05-05 Dispositif à ultrasons

Country Status (5)

Country Link
EP (1) EP0342446B1 (fr)
AT (1) ATE93752T1 (fr)
DE (2) DE3816567A1 (fr)
ES (1) ES2045244T3 (fr)
FI (1) FI99090C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449008A2 (fr) * 1990-03-28 1991-10-02 United Kingdom Atomic Energy Authority Dispositif sonochimique
CN103464360A (zh) * 2013-09-22 2013-12-25 江苏三恒科技股份有限公司 应用于煤矿环境的远测距用超声波换能器
WO2016097513A1 (fr) 2014-12-15 2016-06-23 Cedrat Technologies Transducteur tubulaire ultrasonore modulaire et immersible

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1129615A (fr) * 1955-07-29 1957-01-23 Realisations Ultrasoniques Sa Dispositif de transmission d'ondes élastiques d'un milieu solide à un milieu liquide
US2910390A (en) * 1956-06-29 1959-10-27 Hermes Sonic Corp Machine for cleaning small parts
US3331589A (en) * 1965-02-08 1967-07-18 Frederick G Hammitt Vibratory unit with seal
US3885172A (en) * 1971-12-01 1975-05-20 Continental Can Co Sonic transducer
US4031503A (en) * 1974-08-30 1977-06-21 Hokushin Electric Works, Ltd. Anti-corrosion ultrasonic transducer
EP0341505A2 (fr) * 1988-05-10 1989-11-15 Martin Walter Ultraschalltechnik GmbH Dispositif à ultrasons

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1129615A (fr) * 1955-07-29 1957-01-23 Realisations Ultrasoniques Sa Dispositif de transmission d'ondes élastiques d'un milieu solide à un milieu liquide
US2910390A (en) * 1956-06-29 1959-10-27 Hermes Sonic Corp Machine for cleaning small parts
US3331589A (en) * 1965-02-08 1967-07-18 Frederick G Hammitt Vibratory unit with seal
US3885172A (en) * 1971-12-01 1975-05-20 Continental Can Co Sonic transducer
US4031503A (en) * 1974-08-30 1977-06-21 Hokushin Electric Works, Ltd. Anti-corrosion ultrasonic transducer
EP0341505A2 (fr) * 1988-05-10 1989-11-15 Martin Walter Ultraschalltechnik GmbH Dispositif à ultrasons

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449008A2 (fr) * 1990-03-28 1991-10-02 United Kingdom Atomic Energy Authority Dispositif sonochimique
EP0449008A3 (en) * 1990-03-28 1991-12-11 United Kingdom Atomic Energy Authority Sonochemical apparatus
US5658534A (en) * 1990-03-28 1997-08-19 Aea Technology Plc Sonochemical apparatus
CN103464360A (zh) * 2013-09-22 2013-12-25 江苏三恒科技股份有限公司 应用于煤矿环境的远测距用超声波换能器
WO2016097513A1 (fr) 2014-12-15 2016-06-23 Cedrat Technologies Transducteur tubulaire ultrasonore modulaire et immersible
US10702889B2 (en) 2014-12-15 2020-07-07 Cedrat Technologies Modular, submersible ultrasonic tubular transducer

Also Published As

Publication number Publication date
DE3816567A1 (de) 1989-11-16
EP0342446B1 (fr) 1993-09-01
ATE93752T1 (de) 1993-09-15
FI99090B (fi) 1997-06-30
FI99090C (fi) 1997-10-10
DE58905416D1 (de) 1993-10-07
EP0342446A3 (en) 1990-08-22
FI892287A (fi) 1989-11-15
FI892287A0 (fi) 1989-05-11
ES2045244T3 (es) 1994-01-16

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