EP0505482A1 - Dispositif insonorise de retenue de transducteurs ultrasoniques - Google Patents

Dispositif insonorise de retenue de transducteurs ultrasoniques

Info

Publication number
EP0505482A1
EP0505482A1 EP91902149A EP91902149A EP0505482A1 EP 0505482 A1 EP0505482 A1 EP 0505482A1 EP 91902149 A EP91902149 A EP 91902149A EP 91902149 A EP91902149 A EP 91902149A EP 0505482 A1 EP0505482 A1 EP 0505482A1
Authority
EP
European Patent Office
Prior art keywords
ring
transducer
holder according
nozzle
cover
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.)
Ceased
Application number
EP91902149A
Other languages
German (de)
English (en)
Inventor
Alexander Von Jena
Hermann Schmidt
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.)
Siemens AG
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP0505482A1 publication Critical patent/EP0505482A1/fr
Ceased legal-status Critical Current

Links

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/662—Constructional details

Definitions

  • the present invention relates to a holder for an ultrasound transducer for emitting or for receiving ultrasound radiation in or from a gaseous medium.
  • the radiation of ultrasound from an oscillating solid surface of a transducer into the medium gas leads to only a small one owing to the very large difference in the acoustic wave resistance of the material of the solid surface and the medium, this difference being of the order of magnitude of 4 powers of ten Power transmission ratio from the solid to the gaseous medium and vice versa.
  • Ultrasonic transducers are used in ultrasonic measuring devices for, in particular, flowing gases, e.g. to determine the one
  • Gas flowing through the pipe is as a gas meter, e.g. as a household gas meter.
  • the ultrasonic transducers which determine the measuring section within a tube, are still at a relatively short distance of e.g. Arranged 240 mm.
  • these transducers are inserted into the pipe wall and radiate the ultrasound obliquely to the pipe axis through the flowing medium gas.
  • One converter is the transmitter converter, the other converter the receiver converter.
  • measurement takes place alternately upstream and downstream and with the formation of the difference in the resulting signals.
  • Such ultrasonic flow meters are described in German patent application P 39 41 546.5; P 39 41 545.7; P 39 41 544.9 is described in detail, for which the present invention is an advantageous further development.
  • the evaluation of the received signal can be decisively impaired by sound intensity, which is transmitted from the pipe wall, for example, from sound sources that are even relatively distant.
  • the transducers used ie especially the receiving transducer, must be mounted in the device or in the tube wall in such a way that the body of the transducer and the tube wall are largely insulated from one another with regard to acoustic sound transmission.
  • a further contribution can be made to the at least partial use of material having a sound-absorbing property on the transducer.
  • FIG. 1 shows a basic diagram of a relevant ultrasound measuring device in tube form, on the flow medium of which
  • ultrasonic transducers 3 are attached. As can be seen, these ultrasonic transducers 3 are in diagonally inserted nozzles 1. In particular in the case of measuring devices which are intended for the measurement of such gases which must not be allowed to escape to the outside, appropriate seals must be provided at those points where the device , e.g. to insert or replace the transducer 3, is to be opened.
  • FIG. 2 shows a detailed illustration of such a lateral pipe socket 51 shown in FIG. 1 in longitudinal section.
  • This nozzle 1 is the actual holder for the transducer 11.
  • the obliquely cut, tubular nozzle 51 has a step 52.
  • the outer tube end of the connecting piece 51 is closed with a cover 58, a sealing ring 57 in a groove 56
  • the cover 58 has a clamping ring 55 as seen in the figure as an approach.
  • This clamping ring 55 is dimensioned to match the diameter of the step 52 of the nozzle 51.
  • This O-ring 54 not only serves as a further seal, but it holds the transducer 53 in the socket 51.
  • the step 2 together with the clamping ring 55, ensures precise positioning of the O-ring 54 in the socket 51 and the annular groove 59 in the transducer 11 for its exact positioning in relation to the O-ring 54.
  • the electrical connections of the converter 11 are omitted. There can be leads through the cover 58 or passages provided laterally in the wall of the connecting piece 51. These connections are to be designed in such a way that they in turn cannot cause any significant structure-borne noise transmission, which is ensured, for example, by the use of connecting strands.
  • an optimum of a sound-insulated holder with a linear pressure of the O-ring 54 is achieved, the pressure going back to the provided cylindrical clamping ring 55.
  • the actual gas-tight seal is formed by the additional sealing ring 57, which is pressed into the groove 57 when the cover 58 is screwed on and ensures a permanently reliable seal.
  • a structure-borne noise level of less than -140 dB can be achieved, which is lost in the noise of the received signal.
  • the invention achieves a gas-tight construction with nevertheless high acoustic decoupling and despite exactly defined transducer positioning.
  • level 52 and ring 55 for the socket and the groove 56 for the transducer body can also be interchanged, but the former arrangement per se is preferred.
  • a further development of the invention consists in providing a second O-ring 154 made of permanently elastic material, namely in an area near the sound-radiating front surfaces of the transducer 3.
  • This ring 154 is preferably used to close the gap 60 between the outer wall of the transducer 11 and the annular inner surface of the pipe socket 51 is inevitably present. It has been shown that dust, small particles and the like which settle in the gas flowing through the measuring tube 4 preferentially settle in this gap. This is prevented by the ring 154, which is inserted into the groove 156 of the transducer 11 and the groove 155 of the inner surface of the nozzle 51.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Measuring Volume Flow (AREA)

Abstract

Afin de retenir dans une position exacte et de manière insonorisée un transducteur ultrasonique (3) dans un fluxmètre (figure 1), on utilise un joint torique (4) situé entre des contacts linéaires (2, 5, 6) distribués selon le principe de support à trois points et dont un (rainure 6) retient le transducteur (3).
EP91902149A 1989-12-15 1990-12-13 Dispositif insonorise de retenue de transducteurs ultrasoniques Ceased EP0505482A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3941634A DE3941634A1 (de) 1989-12-15 1989-12-15 Schallisolierte halterung eines ultraschallwandlers
DE3941634 1989-12-15

Publications (1)

Publication Number Publication Date
EP0505482A1 true EP0505482A1 (fr) 1992-09-30

Family

ID=6395626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91902149A Ceased EP0505482A1 (fr) 1989-12-15 1990-12-13 Dispositif insonorise de retenue de transducteurs ultrasoniques

Country Status (8)

Country Link
EP (1) EP0505482A1 (fr)
JP (1) JPH05502297A (fr)
AU (1) AU7070691A (fr)
CA (1) CA2071828A1 (fr)
DE (1) DE3941634A1 (fr)
FI (1) FI922732A0 (fr)
NO (1) NO922333L (fr)
WO (1) WO1991009279A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995028618A1 (fr) * 1994-04-19 1995-10-26 Siemens Aktiengesellschaft Dispositif de retenue de transducteurs ultrasoniques
DE4413894C2 (de) * 1994-04-21 2002-12-12 Teves Gmbh Alfred Biegewandler in Topfform
DE4443415A1 (de) * 1994-12-06 1996-06-13 Siemens Ag Vorrichtung zur Aufnahme eines Schallwandlers und Ultraschall-Durchflußmesser mit derselben
DE19601570A1 (de) * 1996-01-17 1997-07-24 Siemens Ag Vorrichtung zur Aufnahme eines Schallwandlers und Ultraschall-Durchflußmesser mit derselben
DE19723488A1 (de) * 1997-06-05 1998-12-10 Elster Produktion Gmbh Einrichtung zum Befestigen eines Ultraschallwandlers an einem Meßgerät
DE19951874C2 (de) * 1999-10-28 2003-05-22 Krohne Ag Basel Ultraschall-Durchflußmeßgerät
DE102008033098C5 (de) * 2008-07-15 2016-02-18 Krohne Ag Ultraschallwandler
DE102010064119A1 (de) 2010-12-23 2012-06-28 Endress + Hauser Flowtec Ag Durchflussmessgerät
SG193540A1 (en) * 2011-03-23 2013-10-30 Halliburton Energy Serv Inc Ultrasound transducer with acoustic isolator and corresponding mounting method
CN103090915B (zh) * 2013-01-21 2015-03-18 大连环岛仪表有限公司 直接应用于多种超声波流量计的换能器
WO2014187645A1 (fr) 2013-05-21 2014-11-27 Endress+Hauser Flowtec Ag Ensemble de montage d'un convertisseur à ultrasons

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3137836A (en) * 1955-08-25 1964-06-16 Clyde P Glover Support for electro-acoustic transducer
US3890423A (en) * 1973-07-27 1975-06-17 Nusonics Electroacoustic transducer assembly
US3964308A (en) * 1973-09-04 1976-06-22 Scarpa Laboratories, Inc. Ultrasonic flowmeter
FR2284242A1 (fr) * 1974-09-09 1976-04-02 France Etat Transducteur piezoelectrique a basse frequence
US4662212A (en) * 1984-09-10 1987-05-05 Sumitomo Bakelite Company Limited Measuring instrument for concentration of gas
CH672386A5 (fr) * 1986-11-03 1989-11-15 Olten Ag Elektro Apparatebau
DE3832947C2 (de) * 1988-09-28 1996-04-11 Siemens Ag Ultraschall-Wandler
DE8902375U1 (fr) * 1989-02-25 1989-04-27 Krone Ag, 1000 Berlin, De

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9109279A1 *

Also Published As

Publication number Publication date
AU7070691A (en) 1991-07-18
DE3941634A1 (de) 1991-06-20
CA2071828A1 (fr) 1991-06-16
NO922333D0 (no) 1992-06-12
NO922333L (no) 1992-06-12
WO1991009279A1 (fr) 1991-06-27
FI922732A0 (fi) 1992-06-12
JPH05502297A (ja) 1993-04-22

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