EP0716407A2 - Elektroakustischer Wandler in Flextensional-Technik - Google Patents

Elektroakustischer Wandler in Flextensional-Technik Download PDF

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Publication number
EP0716407A2
EP0716407A2 EP95119472A EP95119472A EP0716407A2 EP 0716407 A2 EP0716407 A2 EP 0716407A2 EP 95119472 A EP95119472 A EP 95119472A EP 95119472 A EP95119472 A EP 95119472A EP 0716407 A2 EP0716407 A2 EP 0716407A2
Authority
EP
European Patent Office
Prior art keywords
flextensional
reaction medium
casing
transducer
main
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Withdrawn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
EP95119472A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0716407A3 (enrdf_load_stackoverflow
Inventor
Wilfried Dr. Wilken
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.)
Atlas Elektronik GmbH
Original Assignee
STN Atlas Elektronik 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 STN Atlas Elektronik GmbH filed Critical STN Atlas Elektronik GmbH
Publication of EP0716407A2 publication Critical patent/EP0716407A2/de
Publication of EP0716407A3 publication Critical patent/EP0716407A3/xx
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/121—Flextensional transducers

Definitions

  • the invention relates to an electroacoustic transducer in flextensional technology of the type mentioned in the preamble of claim 1.
  • Electroacoustic transducers known in flextensional technology, or flextensional transducers for short, are used as powerful, electroacoustic transducers for generating high sound pressures at low frequencies in water.
  • the envelope works as a mechanical amplifier by converting the weaker vibrations generated by the electromechanical drive element in the main ellipse axis into a stronger bending movement of the envelope along the minor axis of the ellipse.
  • the type of drive element is irrelevant (cf. ABB technology 8/9/90, hydroacoustics, "Flextensional converter for underwater communication").
  • Small reactor vessels are used in batch mode for the sound treatment of small amounts of the reaction medium, in which the sound energy is generated by so-called sonotrodes. If, on the other hand, larger amounts of the reaction medium are to be treated, so-called tubular reactors are used which enable continuous sonication of the reaction medium in the flow mode.
  • the sonication is usually carried out by a plurality of sound transducers, which are arranged on a longer tube section around the outside of the reactor tube.
  • the object of the invention is to create a new, high-energy, electroacoustic transducer which can be used in the sonochemical process method for sonicating the reaction medium from a flextensional transducer of the type mentioned at the outset.
  • the task is the type defined in the preamble of claim 1 solved according to the invention by the features in the characterizing part of claim 1.
  • the reaction medium is exposed to maximum sound power with unchanged energy supply, whereby the cavitation effect in the reaction medium caused by the sound is significantly increased.
  • the reaction medium is continuously passed through the "focused" sound power inside the casing. If the reaction medium is, for example, sewage sludge, it is better treated due to the high energy, so that it is much more digested in the subsequent digestion process and the proportion of biomass is reduced in favor of increased methane gas production.
  • the new type of flextensional transducer differs in that the sound energy is not brought into the interior of the tube in a focused manner by a large number of peripheral individual transducers, but rather the tube through which the medium flows emits the sound energy itself.
  • the sonoreactor is also much easier to manufacture, since it is formed by the transducer itself and not by an annular arrangement of transducers, the alignment of which with respect to the tube axis must be adjusted with great precision.
  • the flextensional transducer can be used in such a way that the cover, which is open on the end, is inserted in a container through which the reaction medium flows.
  • the envelope of the flextensional transducer is not only flowed around inside, but also outside, and the outside flow is also exposed to the sound field, albeit with a lower sound energy.
  • the casing is formed by a tube section of a tube with an elliptical cross section that carries the reaction medium.
  • a pipe section of the line is composed of several pipe sections, each forming the envelope of flextensional transducers, which are aligned one behind the other and are arranged in one piece along the pipe section.
  • the flextensional transducer shown schematically in FIG. 1 in front view has a cross-sectionally elliptical, cover 10 of cylindrical shape and two electromechanical drive elements 11, 12, which are each supported on the elliptical cover 10 in one of the main apexes 13 and 14.
  • the longitudinal axes of the drive elements 11, 12 and the connecting rods 15, 16 are aligned with the main axis of the elliptical envelope 10.
  • a modified flextensional converter is shown in perspective in FIG. 2. While on one main apex 13 of the cylindrical sleeve 10 with an elliptical cross-section, the drive element 11 continues to engage via a connecting rod 15, the other drive element is replaced by a countermass 17, which in turn is fastened to the outside in the main apex 14 of the sleeve 10.
  • sewage sludge flows through the inside of the casing.
  • the Flextensional transducer When operating the Flextensional transducer is applied by the vibrating drive elements 11, 12 and 11, the vibrating force exciting the shell 10 from the outside to the elliptical shell 10 and the sound is radiated into the interior of the shell 10.
  • the sewage sludge flowing slowly and steadily through the casing 10 is thus treated with high-energy sound, as a result of which a large part of the organic components of the sludge is destroyed by the cavitation effect generated in the sludge.
  • the sewage sludge treated in this way can then be better digested in the digestion process and the proportion of biomass can be reduced in favor of increased methane gas production.
  • the casing 10 of the flextensional transducer is formed by a pipe section of a sewage sludge-carrying pipe 18 with an elliptical cross-section.
  • This pipe section can be arranged, for example, in the sewage sludge feed line to the digestion tower.
  • FIG. 4 shows another type of sludge guidance during sound treatment in connection with the flextensional converter according to FIG. 2.
  • the front-open shell 10 of the flextensional transducer as shown in FIG. 2, which in the simplest case can also be a short piece of pipe, is inserted into a container 20 which is filled with sewage sludge at intervals, emptied and again filled with fresh sewage sludge.
  • the oscillating drive element 11 is arranged outside the container 20 and coupled to the casing 10 via the connecting rod 15 immersed in the sewage sludge.
  • the counterweight 17 is arranged on the opposite main apex 14 of the casing 10, as in FIG. 2.
  • the sewage sludge flowing into the container 20 flows through the interior of the casing 10 and also flows around the casing 10 on the outside thereof. Inside the casing 10, the sewage sludge is exposed to the high-energy sound field, likewise on the outside of the casing 10, but where the sound energy decreases with increasing distance from the casing 10.
  • the invention is not restricted to the described example of the use of the flextensional converter for the sound treatment of sewage sludge in sewage treatment plants.
  • Any liquid sonochemical reaction medium can be used instead of sewage sludge.
  • Such sonochemical reaction media are liquids containing solids, suspensions, emulsions or the like, as they represent, for example, waste water, liquid manure, oil-contaminated water, slurried microbiological or renewable biomasses or the like.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Treatment Of Sludge (AREA)
EP95119472A 1994-12-10 1995-12-11 Elektroakustischer Wandler in Flextensional-Technik Withdrawn EP0716407A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19944444005 DE4444005A1 (de) 1994-12-10 1994-12-10 Elektroakustischer Wandler in Flextensional-Technik
DE4444005 1994-12-10

Publications (2)

Publication Number Publication Date
EP0716407A2 true EP0716407A2 (de) 1996-06-12
EP0716407A3 EP0716407A3 (enrdf_load_stackoverflow) 1996-07-17

Family

ID=6535458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95119472A Withdrawn EP0716407A2 (de) 1994-12-10 1995-12-11 Elektroakustischer Wandler in Flextensional-Technik

Country Status (2)

Country Link
EP (1) EP0716407A2 (enrdf_load_stackoverflow)
DE (1) DE4444005A1 (enrdf_load_stackoverflow)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0340674A2 (en) 1988-05-05 1989-11-08 Edo Corporation/Western Division Flextensional sonar transducer assembly
US4964106A (en) 1989-04-14 1990-10-16 Edo Corporation, Western Division Flextensional sonar transducer assembly

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742499A (en) * 1986-06-13 1988-05-03 Image Acoustics, Inc. Flextensional transducer
US4894811A (en) * 1987-05-18 1990-01-16 Raytheon Company Outboard-driven flextensional transducer
GB9006989D0 (en) * 1990-03-28 1990-05-23 Atomic Energy Authority Uk Sonochemical apparatus
DE4028913A1 (de) * 1990-09-12 1992-03-19 Honeywell Elac Nautik Gmbh Wasserschallwandler fuer tiefe frequenzen
JPH0647346A (ja) * 1992-01-09 1994-02-22 Hiroyuki Yamane 超音波発生源およびこれを用いた浮遊粒子収集装置
GB2285142B (en) * 1993-10-16 1997-12-17 Rawson Francis F H Fluid processing
FR2713430B1 (fr) * 1993-12-03 1996-03-08 France Etat Armement Procédé d'émission d'ondes acoustiques très basses fréquences à forte puissance, et transducteurs correspondants.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0340674A2 (en) 1988-05-05 1989-11-08 Edo Corporation/Western Division Flextensional sonar transducer assembly
US4964106A (en) 1989-04-14 1990-10-16 Edo Corporation, Western Division Flextensional sonar transducer assembly

Also Published As

Publication number Publication date
DE4444005A1 (de) 1996-06-20
EP0716407A3 (enrdf_load_stackoverflow) 1996-07-17

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