EP1515303B1 - Ultraschallwandleranordnung mit Massering zur Dämpfung störender Resonanzen - Google Patents

Ultraschallwandleranordnung mit Massering zur Dämpfung störender Resonanzen Download PDF

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Publication number
EP1515303B1
EP1515303B1 EP04017189A EP04017189A EP1515303B1 EP 1515303 B1 EP1515303 B1 EP 1515303B1 EP 04017189 A EP04017189 A EP 04017189A EP 04017189 A EP04017189 A EP 04017189A EP 1515303 B1 EP1515303 B1 EP 1515303B1
Authority
EP
European Patent Office
Prior art keywords
housing
ultrasound transducer
ring
diaphragm
membrane
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.)
Expired - Lifetime
Application number
EP04017189A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1515303A1 (de
Inventor
Michael Kochan
Gerry Schröter
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.)
Sick Engineering GmbH
Original Assignee
Sick Engineering 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 Sick Engineering GmbH filed Critical Sick Engineering GmbH
Priority to PL04017189T priority Critical patent/PL1515303T3/pl
Publication of EP1515303A1 publication Critical patent/EP1515303A1/de
Application granted granted Critical
Publication of EP1515303B1 publication Critical patent/EP1515303B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
    • 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
    • G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means

Definitions

  • the invention relates to an ultrasonic transducer according to the preamble of claim 1.
  • an ultrasonic transducer which is used for the generation and detection of ultrasonic signals and which allows a reciprocal conversion of electrical vibrations into acoustic vibrations.
  • These ultrasonic transducers are used for example in gas flow meters.
  • ultrasonic transducers In each case arranged in pairs ultrasonic transducers define a measuring path, which lies in a non-perpendicular angle to the longitudinal axis.
  • the measurement principle consists in a determination of a transit time difference of two ultrasonic signals, which once have a component in the flow direction and once a component against the flow direction. From the measured transit time difference can be calculated taking into account the geometry of the flow velocity.
  • the ultrasonic transducer generating and measuring ultrasonic transducers 16 and 18 are inserted by means of special attached to the conduit 12 adapter flanges 24 and 26, so-called converter pockets, in the tube 12 and the pipe wall.
  • the adapter flanges are either welded or integral with the meter body when manufactured using casting technology. Since the ultrasonic transducers 16 and 18 are installed at a certain angle (usually 45 °), there always arises a cavity 28 which constitutes a flow disturbance. This perturbation exists regardless of how deep the ultrasound transducer is inserted, centered, withdrawn, or submerged. Among other things, the larger the sensor diameter and the larger the size of the sensor pocket in relation to the diameter of the measuring cell. The forming vortices are not to be calculated completely analytically and are dependent on upstream of the flow meter possibly existing Voroneen the flow and the flow velocity (Reynolds number). The resulting errors are determined in practice by calibration and stored in the form of a mostly non-linear correction function. Since only a specific Reynolds number range and a specific installation situation can be covered during the calibration, a residual error arises when these conditions are varied, which always occur in practice.
  • the ultrasonic transducers are used in multi-path arrangements to detect imbalances in the flow.
  • the achievable path number is determined by the available installation space, limited by the converter size. In order to increase the accuracy of the flow measurement, it is therefore advantageous to keep in particular the transducer dimensions as small as possible.
  • the previously realized converter dimensions thus limit the achievable accuracy due to excessively disturbed flow or do not allow multi-path arrangement of sensors because of the limited mounting space.
  • the size of the sensors also causes not inconsiderable the overall design for a complete meter and brings additional problems, for example, in the compressive strength, the cost of materials, the weight and has an impact on the total manufacturing costs. The handling during production, transport, installation, maintenance, repair is difficult.
  • an ultrasonic transducer which comprises a piezoelectric element which is pressed by a spring against a membrane emitting the ultrasound.
  • the membrane On the edge, the membrane has an integral with the membrane, reinforced, i. a higher mass having edge, which is thus formed like a ring and serves to dampen disturbing frequencies due to its mass.
  • the edge is kept as short as possible in its longitudinal extent and is arranged at the height of the piezoelectric element.
  • JP 61 094496 and GB-A 1 086 640 ultrasonic transducers which operate on the principle of bending oscillator.
  • the piezoelectric crystal producing the ultrasound is glued directly to the membrane emitting the sound.
  • the ultrasound is generated by the fact that the piezoelectric crystal expands due to the applied voltage, but not the membrane. Since the piezoelectric crystal and the membrane are glued together, this ultimately leads to a bending of the membrane.
  • the diameter of the transducer after the longitudinal oscillator type very small relative to the working frequency. That at the same operating frequency, the converter is smaller than previously known converter, but still sufficient stiffening and damping of the oscillating system is given, so that side resonances are prevented. This is due to the edge inside arrangement of the membrane but separate, so separate mass ring conditional essential effect found by the inventors, which is still reinforced by the arranged adjacent to the grounding damping element, which causes a further reduction of parasitic side resonances.
  • the mass ring is screwed to the membrane, so that the mass ring and the membrane in a defined position to each other and are firmly connected. The same applies to the connection of the mass ring with the housing.
  • the ultrasonic transducers are used in flow meters for aggressive and dangerous as well as under high pressure and temperature related media, so that advantageously the diaphragm and the housing at the height of the Masseringes are welded together. This gives an absolute tightness of the transducer.
  • the damping element consists of an elastic material, preferably a rubber-like material.
  • the separate mass ring may also be formed integrally with the housing.
  • the term "separate" is intended merely to indicate that the mass ring is provided separately from the membrane, because that is an essential feature of the invention that causes the advantageous damping significantly.
  • FIG. 2 shows a measuring arrangement 10, which illustrates the measuring principle, for example of an ultrasonic gas flow meter.
  • a gas flows in the flow direction 14.
  • ultrasonic transducers 16 and 18 are arranged, which define a measuring path.
  • the ultrasonic transducers 16, 18 are suitable for converting electrical signals into ultrasound and vice versa, for transmitting and receiving ultrasound.
  • the measuring path 20 is arranged at an angle not equal to 90 ° to a longitudinal axis 22 of the pipeline 12, so that the ultrasonic signals sent in the opposite direction along the measuring path 20 have a transit time difference due to the gas flow 14. From the transit time difference and the corresponding geometry, the flow velocity and thus the volumetric flow of the gas can be determined.
  • the ultrasonic transducer 16 (FIG. 1) has an ultrasound-generating element 30, which may consist of two piezoceramics 32, 34, which are connected to an electrical line 36.
  • the electrical line 36 is guided electrically insulating.
  • the piezoelectric element 30 is clamped between two cylindrical clamping sections 40 and 42.
  • the two clamping portions 40 and 42 are connected to each other via a clamping member 44, so that the piezoelectric Element 30 is held clamped between the clamping sections.
  • the free end face 46 of the clamping section 42 serves as a transmitting and / or receiving surface, via which the ultrasonic signals are emitted or received.
  • the end face 46 is designed as a bending plate 48 and is referred to below as the membrane 48.
  • the diaphragm 48 oscillates in accordance with the ultrasonic vibrations generated by the piezoelectric element 30 and transmitted via the rigid tensioning section 42 and thus radiates the ultrasonic signals.
  • the signal sequence is reversed and the membrane 48 receives the ultrasonic vibrations, which are passed via the clamping portion 42 to the piezoelectric element 30, which converts the vibrations into electrical signals.
  • the membrane 48 has an angled edge 50, to which a housing 52 which surrounds the aforementioned signal-conducting and signal-processing components.
  • the housing 52 is formed substantially cylindrical.
  • the edge 50 of the membrane 48 is connected to a ground ring 54, preferably screwed.
  • the mass ring is only peripherally connected to the membrane 48, ie only in the region of the edge 50, so that the membrane 48 has the largest possible area for swinging.
  • the internally disposed mass ring 54 is spaced from the membrane 48 by a gap L.
  • the screwed into the edge 50 mass ring 54 is beyond the edge 50, so that the ground ring 54 is also connected to the housing 52, in particular screwed. Since the housing in a suitable and not shown manner, for example via a remote from the diaphragm 48 end 58 arranged flange in the flow meter can be fixed, the signal-conducting and signal processing components are held on the ground ring 54.
  • the housing 52 is welded to the edge 50.
  • the housing 52 on the inside a damping element 64, which may consist of an elastic material, such as rubber.
  • the damping element is annular, so that it can come to lie on the inside of the housing 52 and is advantageously arranged adjacent the mass ring 54.
  • the ground ring 54 may also be integrally formed with the housing 52.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measuring Volume Flow (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
EP04017189A 2003-09-09 2004-07-21 Ultraschallwandleranordnung mit Massering zur Dämpfung störender Resonanzen Expired - Lifetime EP1515303B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL04017189T PL1515303T3 (pl) 2003-09-09 2004-07-21 Układ przetwornika ultradźwiękowego z pierścieniem masowym do tłumienia rezonansów zakłóceniowych

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10341422A DE10341422A1 (de) 2003-09-09 2003-09-09 Ultraschallwandleranordnung
DE10341422 2003-09-09

Publications (2)

Publication Number Publication Date
EP1515303A1 EP1515303A1 (de) 2005-03-16
EP1515303B1 true EP1515303B1 (de) 2006-09-20

Family

ID=34129700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04017189A Expired - Lifetime EP1515303B1 (de) 2003-09-09 2004-07-21 Ultraschallwandleranordnung mit Massering zur Dämpfung störender Resonanzen

Country Status (6)

Country Link
US (1) US20050054932A1 (pl)
EP (1) EP1515303B1 (pl)
AT (1) ATE340398T1 (pl)
DE (2) DE10341422A1 (pl)
ES (1) ES2271748T3 (pl)
PL (1) PL1515303T3 (pl)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010064117A1 (de) 2010-12-23 2012-06-28 Endress + Hauser Flowtec Ag Ultraschallwandler
DE102015110939A1 (de) 2015-07-07 2017-01-12 Valeo Schalter Und Sensoren Gmbh Ultraschallsensor für ein Kraftfahrzeug, Kraftfahrzeug sowie Verfahren zum Herstellen eines Ultraschallsensors

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008147325A1 (en) * 2007-06-01 2008-12-04 Axsensor Ab Piezoelectric transducer device
DE102008027970B4 (de) * 2008-06-12 2013-04-04 Hella Kgaa Hueck & Co. Ultraschallsensor
DE102012209238A1 (de) 2012-05-31 2013-12-05 Robert Bosch Gmbh Ultraschallsensor sowie Vorrichtung und Verfahren zur Messung eines Abstands zwischen einem Fahrzeug und einem Hindernis
DE102014104134A1 (de) * 2014-03-25 2015-10-01 Hydrovision Gmbh Vorrichtung zur akustischen Durchflussmessung und Verfahren für eine derartige Vorrichtung
DE102015113561A1 (de) 2015-08-17 2017-02-23 Endress + Hauser Flowtec Ag Ultraschallwandler zum Einsatz in Ultraschall- Durchflussmessgeräten zur Messung der Durchflussgeschwindigkeit oder dem Volumendurchfluss von Medien in einer Rohrleitung sowie ein Verfahren zur Herstellung eines solchen Ultraschallwandlers
US10585178B2 (en) * 2015-10-21 2020-03-10 Semiconductor Componenents Industries, Llc Piezo transducer controller and method having adaptively-tuned linear damping

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
US2803129A (en) * 1951-05-28 1957-08-20 Council Scient Ind Res Apparatus for testing of elastic materials
GB1086640A (en) * 1963-12-16 1967-10-11 Nat Res Dev Damping backing for piezo-electric crystal or transducer
US3989965A (en) * 1973-07-27 1976-11-02 Westinghouse Electric Corporation Acoustic transducer with damping means
US4162111A (en) * 1977-08-25 1979-07-24 E. I. Du Pont De Nemours And Company Piezoelectric ultrasonic transducer with damped housing
DE3137745A1 (de) * 1981-09-23 1983-04-07 Egon 5000 Köln Gelhard Sensor fuer die durchfuehrung der distanzmessung nach dem ultraschalll-echoprinzip
JPS6194496A (ja) * 1984-10-16 1986-05-13 Nissan Motor Co Ltd 超音波マイクロフオン
US4746831A (en) * 1985-03-27 1988-05-24 Kaijo Denki Co., Ltd. Ultrasonic transreceiver
DE59712467D1 (de) * 1997-08-14 2005-12-08 Landis & Gyr Gmbh Ultraschall-Durchflussmesser
DE19744229A1 (de) * 1997-10-07 1999-04-29 Bosch Gmbh Robert Ultraschallwandler
US6217530B1 (en) * 1999-05-14 2001-04-17 University Of Washington Ultrasonic applicator for medical applications
DE10023302C2 (de) * 2000-05-15 2003-11-13 Grieshaber Vega Kg Piezoelektrisch erregbares Schwingelement
DE10040344A1 (de) * 2000-08-17 2002-02-28 Sick Ag Ultraschallwandler
ATE289058T1 (de) * 2002-03-01 2005-02-15 Sick Engineering Gmbh Ultraschallwandleranordnung mit ultraschallfilter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MURATA MANUFACTURING CO, LTD: "Piezoelectric Sound Components - Application Manual" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010064117A1 (de) 2010-12-23 2012-06-28 Endress + Hauser Flowtec Ag Ultraschallwandler
DE102015110939A1 (de) 2015-07-07 2017-01-12 Valeo Schalter Und Sensoren Gmbh Ultraschallsensor für ein Kraftfahrzeug, Kraftfahrzeug sowie Verfahren zum Herstellen eines Ultraschallsensors
DE102015110939B4 (de) 2015-07-07 2019-02-14 Valeo Schalter Und Sensoren Gmbh Ultraschallsensor für ein Kraftfahrzeug, Kraftfahrzeug sowie Verfahren zum Herstellen eines Ultraschallsensors

Also Published As

Publication number Publication date
US20050054932A1 (en) 2005-03-10
PL1515303T3 (pl) 2007-01-31
ATE340398T1 (de) 2006-10-15
ES2271748T3 (es) 2007-04-16
EP1515303A1 (de) 2005-03-16
DE502004001520D1 (de) 2006-11-02
DE10341422A1 (de) 2005-03-31

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