EP1065009A1 - Dispositif et procédé pour la génération et la propagation d'énergie ultrasonique - Google Patents

Dispositif et procédé pour la génération et la propagation d'énergie ultrasonique Download PDF

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Publication number
EP1065009A1
EP1065009A1 EP99810566A EP99810566A EP1065009A1 EP 1065009 A1 EP1065009 A1 EP 1065009A1 EP 99810566 A EP99810566 A EP 99810566A EP 99810566 A EP99810566 A EP 99810566A EP 1065009 A1 EP1065009 A1 EP 1065009A1
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EP
European Patent Office
Prior art keywords
resonator
resonance frequency
longitudinal
sound transducer
liquid
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Withdrawn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
EP99810566A
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German (de)
English (en)
Inventor
Jürg Solenthaler
Peter Solenthaler
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.)
Telsonic AG
TELSONIC AG fur ELEKTRONISCHE ENTWICKLUNG und FABRIKATION
Original Assignee
Telsonic AG
TELSONIC AG fur ELEKTRONISCHE ENTWICKLUNG und FABRIKATION
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.)
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Publication date
Application filed by Telsonic AG, TELSONIC AG fur ELEKTRONISCHE ENTWICKLUNG und FABRIKATION filed Critical Telsonic AG
Priority to EP99810566A priority Critical patent/EP1065009A1/fr
Publication of EP1065009A1 publication Critical patent/EP1065009A1/fr
Withdrawn legal-status Critical Current

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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
    • B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency

Definitions

  • the invention relates to a device and a method for generating and emitting Ultrasonic energy with the features of the preamble of the independent claims.
  • Such devices and methods are known from EP 44 800 A2 or from EP 455 837.
  • Such devices according to the invention have one with at least one ultrasonic transducer connected resonator on the longitudinal axis to an integer multiple of acoustic length ⁇ / 2 of the operating frequency and the cross-contraction of the Strain waves transmitted to the liquid.
  • a tubular body of some is advantageous Millimeters wall thickness used.
  • WO 98/47632 describes a device for coupling ultrasound into a liquid, whose tubular resonator is designed so that for both longitudinal and transverse vibrations of the jacket the resonance condition is fulfilled.
  • the resonator length and the outside diameter and the thickness of the tube wall are coordinated.
  • the cavity resonator should be along its entire length or on at least one Most of its length have the shape of an inner and outer cylindrical tube.
  • the end remote from the converter should preferably have a hemispherical shell Completion.
  • the creation of a homogeneous sound field in a liquid is therefore subject to certain general conditions knotted.
  • the surface of the resonator should be as large as possible and it the amplitudes on the surface to be transmitted must not be too high.
  • a large surface means tube resonators with a large outer diameter.
  • the invention is now based on optimizing the dimensioning of the resonator so that if possible little cavitation occurs on the pipe surface and the greatest possible energy in the liquid can be transferred. At the same time, an exactly definable operating state should also be defined of the resonator can be guaranteed.
  • the outer diameter of the resonator can therefore should not be chosen arbitrarily large, especially with long pipes with several ⁇ / 2 pieces Different transverse and bending vibrations occur, especially when the excited one Longitudinal frequency is close to the radial frequency.
  • the device according to the invention essentially consists of a sound transducer and an approximately tubular resonator connected to it, the wall of which can be brought into contact with the liquid.
  • the end of the resonator is connected to an end face of the sound transducer at the location of a longitudinal vibration maximum.
  • the total length of the resonator is tuned to an integral multiple of half a wavelength of the longitudinal vibration fed into the resonator by the sound transducer.
  • the resonator is dimensioned such that the value of the longitudinal resonance frequency is at least 0.6 times the value of the radial resonance frequency. Due to this condition, the surface of the resonator that can be brought into contact with the liquid is maximized.
  • the value of the longitudinal resonance frequency is chosen to be smaller than the value of the radial resonance frequency.
  • the relationship between radial and longitudinal resonance frequency has the following formula: 0.6 ⁇ F LONG F WHEEL ⁇ 1
  • the values of the radial or longitudinal resonance frequencies can in particular by targeted choice of the outer diameter and the inner diameter or the length of the resonator.
  • the radial resonance frequency approximately corresponds to a tubular body the quotient of the speed of sound in the body and the middle circumference of the resonator.
  • the arithmetic mean is approximately medium understood from inside and outside circumference.
  • the speed of sound in tubular resonators can vary due to the material deformation during the manufacturing process (rolled pipes) to the speed of sound in the raw material. To calculate the radial resonance frequency this must be taken into account.
  • the radial resonance frequency is also influenced by the geometry of the resonator (e.g. end termination). In reality, you can therefore deviations from the formula result.
  • the resonator can advantageously be of exactly tubular design. But it is also conceivable to have one To use resonator in the form of a polygonal hollow profile.
  • the tubular body of the resonator can be filled with liquid or liquid inside be designed to flow through.
  • the resonator also has surfaces that are perpendicular to the longitudinal direction of vibration.
  • the advantage of such vertical surfaces is that the resonator also has longitudinal vibrations in addition to the transverse vibrations can enter into the liquid.
  • the resonator is dimensioned such that the value of the longitudinal resonance frequency is more than 0.7, in particular more than 0.8 times the value of the radial resonance frequency. It has been found that with such a dimensioning, the tube surface per ⁇ / 2 section and thus the energy that can be irradiated into the liquid is maximized, while the operating state of the resonator remains precisely defined.
  • the longitudinal resonance frequency is the longitudinal Basic resonance understood.
  • the length of which is a multiple of half Excitation wavelength, this is the excitation wavelength.
  • a sound transducer and a hollow resonator connected to it used.
  • the wall of the resonator is brought into contact with the liquid.
  • An optimal one Operation is achieved in that the resonator is excited longitudinally with a frequency which is below the radial resonance frequency of the resonator, but greater than 0.6 times the radial frequency of the resonator.
  • the excitation frequency or the resonator is selected in this way designed so that the longitudinal resonance frequency is greater than 0.7 times the radial Resonance frequency, particularly preferably greater than 0.8 times the radial resonance frequency.
  • a device 1 according to the invention is shown schematically in FIG.
  • the device 1 consists essentially of a sound transducer 2 and a resonator 3, which with the Sound transducer 2 is connected.
  • the sound transducer 2 and the resonator 3 are constructed in a known manner. Such a structure is shown for example in EP 44 800.
  • the content of this publication is expressly stated in included the content of the present application.
  • the resonator 3 is closed on one side with an acoustic transformer 8, which in the end reduces the longitudinal amplitude. On the other side is the resonator connected to the transducer 2 with a transformation piece 9.
  • the sound transducer 2 is typically designed as a piezoelectric converter. It can but also other transducers, e.g. magnetorestrictive are used.
  • the length of the transformation piece 9 or the transformer 8 is ⁇ / 2, where ⁇ denotes the wavelength with which the resonator 3 is excited longitudinally by the sound transducer 2.
  • the length L of the resonator 3 is also selected such that it is also ⁇ / 2 or an integral multiple of ⁇ / 2.
  • the resonator can be made relatively long, for example as shown in EP 44 800 a length of 2.5 times ⁇ or more (up to 20 ⁇ / 2 ) .
  • the present invention differs from the prior art by the targeted optimization of the performance by enlarging or maximizing the surface 5 that can be brought into contact with the liquid.
  • the mean diameter of the resonator 3 is nevertheless selected such that a controllable operating state is achieved.
  • FIG. 2 shows an enlarged section of the resonator 3 in section.
  • the resonator 3 is tubular and has a cylindrical wall 4 with a thickness a
  • the length L of the resonator 3 is dimensioned on the basis of a predetermined excitation frequency. Likewise, starting from the excitation frequency, the diameter of the resonator 3 is dimensioned such that the surface 5 becomes as large as possible, but that the radial resonance frequency fr is greater than the excitation frequency or the longitudinal resonance frequency f r .
  • the radial resonance frequency f r is approximately Speed of sound in the resonator medium size
  • the mean circumference arises from the mean diameter d m .
  • the average diameter corresponds approximately to the arithmetic mean of the outer diameter d A and the inner diameter d I.
  • the inner diameter d I or the outer diameter d A are therefore chosen as a function of the longitudinal excitation frequency f l such that f l is more than 0.6 times the radial resonance frequency f r , but less than the radial resonance frequency f r .
  • the resonator is made of stainless steel.
  • the resonator 3 is excited by the converter 2 at a frequency of 25 kHz.
  • the inside diameter d I is 45 mm and the outside diameter is 55 mm.
  • a radial resonance frequency f r of 33.2 kHz was measured in this resonator.
  • the longitudinal excitation or resonance frequency f l is therefore 0.753 f r .
  • the length L of the resonator is 180 mm, which corresponds to twice 2 ⁇ / 2 .
  • FIG. 3 shows an alternative exemplary embodiment of the invention, according to which the Resonator 3 is excited on both sides with a sound transducer 2.
  • the two sound transducers 2 work in sync or in sync with each other.
  • FIG. 4a A preferred exemplary embodiment of a resonator 3 is shown in FIG. 4a.
  • the resonator 3 is on its outer surface with perpendicular to the longitudinal direction of vibration Provide surfaces 7.
  • the surfaces 7 serve to introduce longitudinal vibrations into the Liquid.
  • Figure 4b shows an embodiment in which the surfaces 7 as a recess in the outer surface of the resonator 3 are formed.
  • FIG. 5 shows a further exemplary embodiment of a device 1 according to the invention, in which a plurality of sound transducers 2 are provided for increasing the power, wherein inner sound transducers 2 are arranged within the resonator 3.
  • the invention is not limited to the specific design of the resonator, in particular not to its shape or to the number or distribution of sound transducers. It is essential that the surface 5, which emits ultrasound energy into the surrounding liquid, is maximized, while at the same time the dimension of the resonator is selected such that the longitudinal excitation frequency f l remains below the radial resonance frequency f r .
EP99810566A 1999-07-02 1999-07-02 Dispositif et procédé pour la génération et la propagation d'énergie ultrasonique Withdrawn EP1065009A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99810566A EP1065009A1 (fr) 1999-07-02 1999-07-02 Dispositif et procédé pour la génération et la propagation d'énergie ultrasonique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99810566A EP1065009A1 (fr) 1999-07-02 1999-07-02 Dispositif et procédé pour la génération et la propagation d'énergie ultrasonique

Publications (1)

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EP1065009A1 true EP1065009A1 (fr) 2001-01-03

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EP99810566A Withdrawn EP1065009A1 (fr) 1999-07-02 1999-07-02 Dispositif et procédé pour la génération et la propagation d'énergie ultrasonique

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EP (1) EP1065009A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015103011U1 (de) 2014-06-06 2015-07-27 Weber Ultrasonics Gmbh Ultraschall-Konverter
WO2016097513A1 (fr) 2014-12-15 2016-06-23 Cedrat Technologies Transducteur tubulaire ultrasonore modulaire et immersible
DE202017100958U1 (de) 2017-02-21 2017-03-06 Weber Ultrasonics AG Ultraschallschneidelement
NL1042153B1 (nl) * 2016-11-21 2018-05-28 Water Waves B V Werkwijze en inrichting voor een ultrasone transducer en overdracht van ultrasone energie naar water
DE102019130230A1 (de) * 2019-11-08 2021-05-12 Weber Ultrasonics AG Partiell profiliertes Schwingelement
US20210190571A1 (en) * 2018-09-06 2021-06-24 Abb Schweiz Ag Transducer for non-invasive measurement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016436A (en) * 1975-12-10 1977-04-05 Branson Ultrasonics Corporation Sonic or ultrasonic processing apparatus
EP0044800A2 (fr) * 1980-07-21 1982-01-27 TELSONIC AG für elektronische Entwicklung und Fabrikation Dispositif et procédé pour la génération et l'émission d'énergie ultrasonore
EP0455837A1 (fr) * 1990-03-09 1991-11-13 Martin Walter Ultraschalltechnik GmbH Résonnateur ultrasonore
DE4344455A1 (de) * 1993-12-23 1995-06-29 Branson Ultraschall Vorrichtung zum Abstrahlen von Ultraschallenergie in Flüssigkeiten
WO1998047632A1 (fr) * 1997-04-24 1998-10-29 Tech Sonic Gesellschaft Für Ultraschall-Technologie Mbh Appareil a transmettre des ondes ultrasonores a un milieu liquide ou pateux

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016436A (en) * 1975-12-10 1977-04-05 Branson Ultrasonics Corporation Sonic or ultrasonic processing apparatus
EP0044800A2 (fr) * 1980-07-21 1982-01-27 TELSONIC AG für elektronische Entwicklung und Fabrikation Dispositif et procédé pour la génération et l'émission d'énergie ultrasonore
EP0455837A1 (fr) * 1990-03-09 1991-11-13 Martin Walter Ultraschalltechnik GmbH Résonnateur ultrasonore
DE4344455A1 (de) * 1993-12-23 1995-06-29 Branson Ultraschall Vorrichtung zum Abstrahlen von Ultraschallenergie in Flüssigkeiten
WO1998047632A1 (fr) * 1997-04-24 1998-10-29 Tech Sonic Gesellschaft Für Ultraschall-Technologie Mbh Appareil a transmettre des ondes ultrasonores a un milieu liquide ou pateux

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015103011U1 (de) 2014-06-06 2015-07-27 Weber Ultrasonics Gmbh Ultraschall-Konverter
WO2015185315A1 (fr) 2014-06-06 2015-12-10 Weber Ultrasonics Gmbh Convertisseur à ultrasons
DE102014210886A1 (de) 2014-06-06 2015-12-17 Weber Ultrasonics Gmbh Ultraschall-Konverter
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
NL1042153B1 (nl) * 2016-11-21 2018-05-28 Water Waves B V Werkwijze en inrichting voor een ultrasone transducer en overdracht van ultrasone energie naar water
DE202017100958U1 (de) 2017-02-21 2017-03-06 Weber Ultrasonics AG Ultraschallschneidelement
US20210190571A1 (en) * 2018-09-06 2021-06-24 Abb Schweiz Ag Transducer for non-invasive measurement
DE102019130230A1 (de) * 2019-11-08 2021-05-12 Weber Ultrasonics AG Partiell profiliertes Schwingelement

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