EP0858844A2 - Tête sonore - Google Patents

Tête sonore Download PDF

Info

Publication number
EP0858844A2
EP0858844A2 EP98102214A EP98102214A EP0858844A2 EP 0858844 A2 EP0858844 A2 EP 0858844A2 EP 98102214 A EP98102214 A EP 98102214A EP 98102214 A EP98102214 A EP 98102214A EP 0858844 A2 EP0858844 A2 EP 0858844A2
Authority
EP
European Patent Office
Prior art keywords
piezo element
housing
damping body
transducer according
transducer
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
EP98102214A
Other languages
German (de)
English (en)
Other versions
EP0858844A3 (fr
EP0858844B1 (fr
Inventor
Jürgen Kroh
Stephan Dr. Burkhard
Paul Greppmaier
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.)
Landis and Gyr GmbH
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0858844A2 publication Critical patent/EP0858844A2/fr
Publication of EP0858844A3 publication Critical patent/EP0858844A3/fr
Application granted granted Critical
Publication of EP0858844B1 publication Critical patent/EP0858844B1/fr
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
    • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device

Definitions

  • the invention relates to a transducer, in particular on an ultrasonic head, with one arranged in a housing Piezo element.
  • a damped ultrasound transmitter is e.g. from US 4,417,480 known.
  • Such an ultrasonic transmitter and / or ultrasonic receiver serves e.g. for measuring the flow and the velocity of a fluid with the help of Sound waves generated or detected by a piezo element will.
  • the one for sound wave generation or sound wave measurement serving transducer typically includes an on closed on one side and on the opposite Open metal and cylindrical housing. This serves as a receiving part for a piezoelectric Transmitter / receiver made of usually ceramic material.
  • Damping means provided the sound energy from the piezo element absorbed.
  • the damping agent is by means of a Screw cap pressed against the piezo element, the Screw cap with one on the opening side of the housing provided internal thread is brought into thread engagement.
  • One centrally through the screw cap and through the damping agent The insulated conductor is used as a signal connection contacted with a connection side of the piezo element.
  • a disadvantage of this known transducer is a considerable one Assembly effort when assembling the inside of the Housing parts to be arranged as well as a material-intensive Execution of the transducer housing. Beyond that those from the piezo element and from the damping means as well from additional spring elements and from the screw cap composite inner structure of the transducer especially complex and cost-intensive.
  • a transducer in which the Piezo element is loosely inserted in its housing.
  • a liquid preferably with oil or water.
  • a connecting wire is central on the back of the piezo element soldered on.
  • an O-ring is provided for liquid and gas tight sealing.
  • a damping body provided the back of the piezo element with the housing dampened. The required connection pressure for the conductive The piezo element is contacted by clamping achieved by means of a locking ring. With this arrangement electrical contacting is very problematic, whereby the central solder connection the vibration behavior of the piezo element adversely affected.
  • the invention is therefore based on the object, one in particular simply constructed and easy to assemble transducer, in particular ultrasound head to specify.
  • the transducer has in a housing an interior system that consists of a floor-side and piezo element connected to a connecting lug and is constructed from an overlying damping body, and that by means of a lockable securing element in the housing is clamped.
  • the piezo element and the Damping body between the bottom of the housing and one Pinch disc clamped. It is on the Damping body facing away from the pressure plate provided Securing element in the form of a circlip, which in a housing structural part, e.g. in an internal housing groove or against a shoulder contour within the housing, can be snapped into place.
  • the locking ring thus serves for locking of the prestressed inner system made of piezo element and Damping body.
  • the electrical connection of the piezo element takes place via a Ground connection and a signal connection.
  • a Ground connection for this is the ground connection side of the piezo element expediently with the Contacted case back.
  • the connecting lug of the piezo element is then connected, which is preferably glued there.
  • connection lug is arranged decentrally.
  • the connection lug is in one guided by the damping body and by the securing element Insulated hose arranged. This is in turn arranged laterally and coaxially within the housing.
  • the piezo element is expediently glued into the housing, the adhesive advantageously being conductive and elastic is. It is between the housing and the piezo element on the one hand and between this and the connecting lug on the other each with a conductive and elastic adhesive joint intended.
  • the adhesive thus serves as an electrical connection and acoustic coupling between housing, piezo element and Connection lug. It also forms an elastic joint between the housing and the piezo element, their materials have different coefficients of thermal expansion.
  • the damping body serves for the rear damping of the ceramic Piezo element. It also increases pressure stability from the medium side to the transducer.
  • the damping body continues to hermetically seal the piezoceramic against environmental influences from what he preferably has a recess on the bottom for receiving the piezo element. It also serves the damping body for balancing e.g. due to temperature changes induced material stresses.
  • the housing is advantageously a material-saving design Receiving part of low construction height. It has a funnel shape graduated inner contour so that the individual parts of the inner system, namely the piezo element and the damping body and, if necessary, the pressure plate, in a distinctive Order inserted in the receiving part and then clamped and held by means of the locking ring can be.
  • the damping body has centering the pressure plate a centering molding - z. B. a molded spigot - on that in a complementary Opening engages in the pressure plate.
  • the advantages achieved with the invention are in particular in that by clamping the essentially from a Piezo element and a damping body constructed inner system of a transducer within a recording part by means of a lockable securing element a simple and rational installation of the interior system by few and simple parts to be joined is possible.
  • the assembly of the interior system by means of the locking element in the form of a locking ring and a pressure plate thus enables a simple and cost-effective interior structure and a minimization of the installation height of the receiving part through material reduction.
  • the A The pressure plate which is a stamped part is particularly cost-effective and easy to manufacture. Also inexpensive
  • the damping body is to be produced, since it is simple Molding can be executed.
  • the side design is a major advantage the connecting lug, since it is a full-surface undisturbed Damping of the piezo element is guaranteed.
  • the structure of the The interior system also enables direct contact the signal side of the piezo element without critical Contact resistance. Next is a particularly short input and / or Decay when the piezo element is excited and achieved a particularly good interference / useful signal ratio. Further are due to the pinching by means of the locking ring caused and thus by the compression of the damping body caused compressive forces on the piezo element only low adhesive forces required with regard to the adhesive.
  • FIG. 1 shows a transducer in longitudinal section with in a Receiving part of clamped inner system.
  • Figure 2 shows a connection flag in a spatial representation.
  • the transducer 1 is e.g. an ultrasound receiver or ultrasound transmitter to measure flow and / or speed one flowing, for example, in a pipeline Medium. It comprises a receiving part 2 as a housing or Installation body for an interior system 3.
  • the receiving part 2 serves moreover as a fastening system of the transducer 1 within a (not shown) flow measuring system. It also serves to seal off the medium to be measured.
  • the receiving part 2 also serves as a ground connection of a piezo element 4 in the form of a piezoceramic that forms part of the interior system 3 of the transducer 1.
  • the piezo element 4 is included glued to the bottom side 5 of the receiving part 2. This is between the corresponding ground connection side 4a of the piezo element 4 and the bottom side 5 of the receiving part 2 an adhesive layer or adhesive joint 6 from a conductive set Adhesive provided at the same time as an elastic joint serves. On the bottom side 5 of the receiving part 2 facing away Signal connection side 4b of the piezo element 4 is a connection lug 8 out there with their spoon-like contact end 7 is contacted. The connecting lug 8 the galvanic contact via a further conductive adhesive joint 9 between the piezo element 4 and a (not shown) Electronics.
  • the bonding is therefore preferably under Pressure and under vacuum.
  • Figure 2 shows the terminal lug 8 in detail. It is preferred from a one-piece piece of metal, e.g. Copper, manufactured and has a contact end 7, which for contacting is glued to the piezo element 4.
  • a one-piece piece of metal e.g. Copper
  • Piezo elements usually have contact on them Vaporized connecting electrodes on top. With these connection electrodes an electrical contact must be made will.
  • the present terminal lug 8 therefore has a contact end 7, which is at least approximately the shape of the piezo element 4 and thus over a large area on the ground connection side 4a contacts the piezo element 4. So is one very good contacting given the vibration behavior of the piezo element 4 is not impaired. this concerns in particular the central area of the piezo element 4, in which there is usually an antinode at one Training signal control. With a central connection like in the above-mentioned prior art, this antinode strongly damped, which hinders the propagation of vibrations. There is a free one at the connection flag Swinging of the piezo element 4 ensures.
  • a damping body 10 as another part of the Interior system 3 of the transducer 1 is arranged in the receiving part 2.
  • the damping body 10 damping the piezo element 4 serves to increase the pressure stability compared to that on the Transducer 1 acting flow medium M and seals it Piezo element 4 hermetically against the outside.
  • the damping body 10 points on the bottom side 5 facing Side at least partially enclosing the piezo element 4 Recess 11 for positioning the piezo element 4 within the receiving part 2.
  • a pin 12 formed by a Complementary opening 13 protrudes in a pressure plate 14.
  • the pin 12 serves as a centering for the Pressure plate 14 within the receiving part 2.
  • a locking element 15 in the form of a locking ring provided that for the assembly-friendly locking of the entire biased interior system 3 is used.
  • the locking ring is located 15 in the locked state in a groove 16 of the Receiving part 2.
  • the inner system 3 includes in addition to the piezo element 4 and the damping body 10 and the connecting lug 8 also the pressure plate 14 and the circlip 15.
  • connection lug 8 is of an insulating tube 17 encased, which is also part of the interior system 3 is. This is an unwanted short circuit between ground and Signal connection of the piezo element 4 safely avoided.
  • the damping body 10 has several functions in the present case. To the one he seals the piezo element 4 from the outside atmosphere gas and liquid tight. On the other hand, it creates a back pressure compared to those acting on the bottom 5 from the outside Pressure of the surrounding medium.
  • Such transducers are in practice, for example, for temperature ranges from -20 to 180 ° C and designed for pressures from 0 to 60 bar. At a thick interpretation of the bottom 5 can the sound signal poorly transmitted into the medium. A thin bottom 5 could be destroyed by the surrounding pressure.
  • the thinly dimensioned base 5 is placed over the piezo element 4 of the damping body 10 relative to the housing 2 supported, whereby the external pressure is absorbed.
  • the damping body 10 is preferably around 30% of its volume pressed together when installed. This dimensioning is done usually taking into account the transducer 1 surrounding temperature fluctuations.
  • the bottom 5 preferably has a thickness of 0.5 to 0.7 mm, in particular a thickness from 0.1 to 2 mm.
  • the damping body 10 also includes the Function of the rear vibration damping, whereby Sound waves emitted to the rear are absorbed will. Furthermore, the damping body 10 also fulfills the Task of an even pressure and load distribution on the Piezo element 4.
  • the particularly simple construction of the inner system 3 enables the transducer 1 to be assembled in a simple and assembly-friendly manner, since after the individual parts 4, 8, 10 and 14 of the inner system 3 have been inserted, the locking ring 15 only snaps into place.
  • a simple and efficient assembly of the inner system 3 is made possible by a few and easy-to-fit parts.
  • the simple and fail-safe installation is also supported by the graduated inner contour of the housing or receiving part 2, which can be seen in the figure. To realize a low-cost "receiving part 2, this can also be made smaller with respect to the axial length, so that the region of the receiving part 2 above the dashed line can be omitted.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Measuring Fluid Pressure (AREA)
  • Surgical Instruments (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Measuring Volume Flow (AREA)
EP98102214A 1997-02-12 1998-02-09 Tête sonore Expired - Lifetime EP0858844B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19705321 1997-02-12
DE19705321 1997-02-12

Publications (3)

Publication Number Publication Date
EP0858844A2 true EP0858844A2 (fr) 1998-08-19
EP0858844A3 EP0858844A3 (fr) 2000-10-04
EP0858844B1 EP0858844B1 (fr) 2002-06-12

Family

ID=7820007

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98102214A Expired - Lifetime EP0858844B1 (fr) 1997-02-12 1998-02-09 Tête sonore

Country Status (4)

Country Link
EP (1) EP0858844B1 (fr)
AT (1) ATE219276T1 (fr)
DE (1) DE59804376D1 (fr)
DK (1) DK0858844T3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10047383C1 (de) * 2000-09-25 2001-11-08 Siemens Ag Ultraschall-Durchflussmesser
DE102005001899A1 (de) * 2005-01-14 2006-07-27 Landis+Gyr Gmbh Ultraschallkopf
EP1701140A1 (fr) 2005-03-11 2006-09-13 Landis+Gyr GmbH Canal de mesure ultrasonique
EP1731883A1 (fr) 2005-06-10 2006-12-13 Landis+Gyr GmbH Procédé pour détecter un changement géométrique d'un canal de mesure de débit par ultrasons
WO2010120752A2 (fr) 2009-04-13 2010-10-21 Daniel Measurement And Control, Inc. Transducteur à connexion électrique robuste à un cristal piézoélectrique
WO2014016081A3 (fr) * 2012-07-26 2014-05-15 Volkswagen Aktiengesellschaft Dispositif capteur d'ultrasons

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3890423A (en) * 1973-07-27 1975-06-17 Nusonics Electroacoustic transducer assembly
JPS5832559B2 (ja) * 1979-07-04 1983-07-13 株式会社 モリタ製作所 空中超音波パルスの伝送方式並びにこれに用いる超音波送受波具
JPH0749914Y2 (ja) * 1986-01-29 1995-11-13 株式会社村田製作所 超音波トランスデユ−サ
DE3826799C2 (de) * 1988-08-06 1995-08-31 Teves Gmbh Alfred Ultraschallwandler
JPH02138889A (ja) * 1988-11-18 1990-05-28 Matsushita Electric Ind Co Ltd 超音波送受波器
JPH07114383A (ja) * 1993-10-15 1995-05-02 Murata Mfg Co Ltd 圧電ブザー

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10047383C1 (de) * 2000-09-25 2001-11-08 Siemens Ag Ultraschall-Durchflussmesser
DE102005001899A1 (de) * 2005-01-14 2006-07-27 Landis+Gyr Gmbh Ultraschallkopf
DE102005001899B4 (de) * 2005-01-14 2007-03-08 Landis+Gyr Gmbh Ultraschallkopf
EP1701140A1 (fr) 2005-03-11 2006-09-13 Landis+Gyr GmbH Canal de mesure ultrasonique
EP1731883A1 (fr) 2005-06-10 2006-12-13 Landis+Gyr GmbH Procédé pour détecter un changement géométrique d'un canal de mesure de débit par ultrasons
WO2010120752A2 (fr) 2009-04-13 2010-10-21 Daniel Measurement And Control, Inc. Transducteur à connexion électrique robuste à un cristal piézoélectrique
EP2419968A4 (fr) * 2009-04-13 2014-01-15 Daniel Measurement & Control Transducteur à connexion électrique robuste à un cristal piézoélectrique
WO2014016081A3 (fr) * 2012-07-26 2014-05-15 Volkswagen Aktiengesellschaft Dispositif capteur d'ultrasons
CN104662603A (zh) * 2012-07-26 2015-05-27 大众汽车有限公司 超声波传感器设备

Also Published As

Publication number Publication date
EP0858844A3 (fr) 2000-10-04
EP0858844B1 (fr) 2002-06-12
ATE219276T1 (de) 2002-06-15
DK0858844T3 (da) 2002-10-07
DE59804376D1 (de) 2002-07-18

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