WO2022053265A1 - Transducteur à ultrasons et débitmètre à ultrasons à pince - Google Patents

Transducteur à ultrasons et débitmètre à ultrasons à pince Download PDF

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Publication number
WO2022053265A1
WO2022053265A1 PCT/EP2021/072741 EP2021072741W WO2022053265A1 WO 2022053265 A1 WO2022053265 A1 WO 2022053265A1 EP 2021072741 W EP2021072741 W EP 2021072741W WO 2022053265 A1 WO2022053265 A1 WO 2022053265A1
Authority
WO
WIPO (PCT)
Prior art keywords
ultrasonic
measuring tube
transducer
ultrasonic transducer
coupling element
Prior art date
Application number
PCT/EP2021/072741
Other languages
German (de)
English (en)
Inventor
Achim Wiest
Andreas Berger
Beat Kissling
Original Assignee
Endress+Hauser Flowtec 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 Endress+Hauser Flowtec Ag filed Critical Endress+Hauser Flowtec Ag
Publication of WO2022053265A1 publication Critical patent/WO2022053265A1/fr

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Classifications

    • 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 invention relates to an ultrasonic transducer and a clamp-on ultrasonic flow meter for measuring a flow rate or a volume flow of a medium flowing through a pipeline.
  • ultrasonic transducers are attached to an outside of a measuring tube, by means of which ultrasonic signals are radiated into the measuring tube and ultrasonic signals emerging from the measuring tube are detected.
  • Ultrasonic transducers for such measuring devices have a coupling element which is set up to transmit the ultrasonic signals between the measuring tube and a transducer element, as can be seen, for example, from DE102010063535A1.
  • a critical aspect of such coupling elements is the acoustic resistance between the coupling element and the pipeline, which makes it difficult for sound to pass between the coupling element and the pipeline and vice versa.
  • the object of the invention is to propose an ultrasonic transducer and a clamp-on ultrasonic flowmeter with such an ultrasonic transducer, in which a good and robust sound transmission can be guaranteed.
  • the object is achieved by an ultrasonic transducer according to independent claim 1 and by a clamp-on ultrasonic flow meter according to independent claim 5.
  • An ultrasonic transducer according to the invention of a clamp-on ultrasonic flow meter comprises:
  • a transducer element in particular a piezo element, for generating and detecting ultrasonic signals
  • a coupling element with a first side and a second side the coupling element being set up in particular to be acoustically coupled to a medium-carrying pipeline via the second side and to transmit ultrasonic signals between the transducer element and the pipeline and vice versa,
  • the transducer element is arranged on a side surface of the first side, the second side having a side surface with a depression structure with at least one depression, which depression structure reduces a bearing surface of the side surface, the ultrasonic signals that can be generated by the transducer elements having a central frequency, which central frequency is im
  • the indentation area corresponds to the portion of the reference area that covers an indentation.
  • the reference surface is thus a continuation of the bearing surface across the indentations.
  • the ultrasonic transducer is preferably set up to radiate ultrasonic signals along one direction into a measuring tube.
  • the indentations each have a minimum depth of 0.1 millimeters and in particular 0.2 millimeters and preferably 0.5 millimeters and/or a maximum depth of 20 millimeters and in particular 15 millimeters and preferably 10 millimeters.
  • the side surface of the second side has a curvature.
  • the coupling element can advantageously be placed on a curved outer surface of a measuring tube.
  • the coupling element is made from a metal such as aluminum or steel, or from a ceramic such as aluminum oxide, zirconium oxide or silicon nitride, or from a metallic or non-metallic glass.
  • the area ratio is at most 2 and in particular at most 1.5.
  • An upper limit for the area ratio ensures good ultrasonic signal transmission between the coupling element and the pipeline, since otherwise there would only be a small contact area. In addition, it is ensured that mechanical stability of the coupling element is guaranteed in the area of the bearing surface. If the contact surface is too small, high contact pressures can lead to undesired deformations of the coupling element.
  • RECTIFIED SHEET (RULE 91) ISA/EP Description of a measuring tube for guiding the medium, at least one pair of ultrasonic transducers according to one of the preceding claims, an electronic measuring/operating circuit for operating the ultrasonic transducers, for evaluating measurement signals and providing flow measurement values.
  • the measuring tube can be part of an existing pipeline to which the ultrasonic transducers are subsequently attached, or installed in a pipeline together with the ultrasonic transducers.
  • the outside of the measuring tube has at least one flat surface designed to accommodate at least one ultrasonic transducer.
  • the measuring tube has an outer radius, with the side surface of the second side of the coupling element having a curvature, which curvature has a radius of curvature, the radius of curvature being at most 10 percent larger than the outer radius, and the radius of curvature corresponding at least to the value of the outer radius .
  • the coupling element rests securely and sturdily on the measuring tube.
  • This is advantageous for measuring tubes with a round cross-section without a flat contact surface for ultrasonic transducers.
  • a radius of curvature slightly larger than the outer radius also makes it easier to use a metal foil between the coupling element and the measuring tube.
  • a metal foil is arranged between each ultrasonic converter and the measuring tube, which is set up to further improve an acoustic coupling between the ultrasonic converter and the measuring tube.
  • the metal foil has the property that an existing surface roughness of the measuring tube for the coupling element is smoothed out.
  • the film at least partially adapts to the surface of the measuring tube.
  • the metal foil has an acoustic index between the acoustic index of the measuring tube and the acoustic index of the coupling element.
  • an average surface pressure of the ultrasonic transducers on the measuring tube is at least 0.1 megapascal, and in particular at least 1 megapascal and preferably at least 10 megapascals.
  • a corresponding surface pressure improves the coupling and smoothes the metal foil when present.
  • the surface pressure can be adjusted by a person skilled in the art depending on the material of the metal foil and a process temperature.
  • the flow meter is suitable for carrying media with a temperature above 200 degrees.
  • Fig. 1 outlines an exemplary schematic clamp-on ultrasonic flow meter
  • Fig. 2 outlines a detailed view of an ultrasonic transducer shown in Fig. 1,
  • Fig. 4 outlines cross sections of exemplary depressions according to the invention
  • Fig. 1 sketches a schematic side view of an exemplary clamp-on ultrasonic flow meter 1 for measuring a flow rate or a volume flow of a medium flowing through a pipeline, which has a measuring tube 20 with a measuring tube axis 23, two ultrasonic transducers mounted on an outer side 21 of the measuring tube 10 and an electronic measuring Z operating circuit 30 for operating the ultrasonic transducer and for evaluating measurement signals and providing
  • Each ultrasonic transducer has a migrating element 11 and a coupling element 12 .
  • the converter element can be a piezo element.
  • the measuring tube can be part of an existing pipeline to which the ultrasonic transducers are subsequently attached, or installed in a pipeline together with the ultrasonic transducers.
  • the ultrasonic transducers are configured here by way of example in such a way that a 2-traverse path of ultrasonic signals through the measuring tube with a reflection on an inner wall of the measuring tube results. Configurations with one truss or three or more trusses are also known to a person skilled in the art and he will choose one that is suitable for him.
  • Each ultrasonic transducer has a migrating element 11 and a coupling element 12 .
  • FIG. 2 sketches a close-up of an ultrasonic transducer shown in FIG. 1, the transducer element being arranged on a side surface 12.11 of a first side 12.1 of the coupling element, facing away from the measuring tube.
  • the coupling element is acoustically coupled to the measuring tube via a side surface 12.21 of a second side 12.2 facing the measuring tube.
  • a metal foil 40 can be arranged between the measuring tube 20 and the coupling element 12, which is set up to compensate for unevenness of the measuring tube on the outside in the area of the ultrasonic transducer and thus to produce an improved acoustic contact.
  • the side surface 12.21 of the second side has an indentation structure, which is shown in Figs. 3 a) to c) is explained in more detail.
  • 3 a outlines an exemplary depression structure with a plurality of parallel depressions 12.3, which run parallel to a short edge of the side surface of the second side, only two depressions being identified for the sake of clarity.
  • the indentations reduce a bearing surface 12.4 of the side surface.
  • only two areas of the bearing surface are marked for the sake of clarity.
  • the side surface 12.21 of the second side without considering the indentation defines a reference surface, with each point in a central area of the reference surface being assigned a circular environment U with a diameter, which environment is completely covered by the reference surface.
  • the central area of the reference surface i.e. the union of all surroundings U.
  • a lower limit of the area ratio increases a surface pressure for a given contact pressure, while the upper limit ensures that there is sufficient contact area.
  • FIG. 3b outlines an embodiment in which the depressions run parallel to a long edge of the side surface of the second side.
  • FIG. 4 outlines three exemplary cross sections through elongated indentations, the cross sections having a triangular shape, a rectangular shape, or a circular shape. Other cross-sectional shapes are conceivable. The same applies to circular indentations such as bores.
  • Fig. 5 sketches two front views of two exemplary configurations of measuring tube 20 and coupling element 12, in which case the measuring tube can be partially flat on the outside, so that a coupling element with a flat side surface 12.21 on the second side can be placed on the measuring tube.
  • the coupling element can also have a side surface 12.21 on the second side

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention se rapporte à un transducteur à ultrasons (10) d'un débitmètre à ultrasons à pince (1) comprenant : - un élément transducteur (11), en particulier un élément piézoélectrique, permettant de générer et de détecter des signaux ultrasonores ; et - un élément de couplage (12) présentant un premier côté (12.1) et un second côté (12.2), l'élément transducteur étant situé sur une surface latérale (12.11) du premier côté, le second côté présentant une surface latérale (12.21) comprenant une structure d'évidement pourvue d'au moins un évidement (12.3), ladite structure d'évidement réduisant une surface d'appui de la surface latérale. La surface latérale du second côté définit une surface de référence, un environnement circulaire (U) présentant un diamètre (D) est associé à chaque point dans une région centrale de la surface de référence, ledit environnement est complètement recouvert par la surface de référence, dans chaque environnement (U), un rapport de surface de la surface d'évidement à la surface d'appui est d'au moins 0,5, avec : D=WL/2.
PCT/EP2021/072741 2020-09-11 2021-08-16 Transducteur à ultrasons et débitmètre à ultrasons à pince WO2022053265A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020123737 2020-09-11
DE102020123737.5 2020-09-11

Publications (1)

Publication Number Publication Date
WO2022053265A1 true WO2022053265A1 (fr) 2022-03-17

Family

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PCT/EP2021/072741 WO2022053265A1 (fr) 2020-09-11 2021-08-16 Transducteur à ultrasons et débitmètre à ultrasons à pince

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WO (1) WO2022053265A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022120723A1 (de) 2022-08-17 2024-02-22 Endress + Hauser Flowtec Ag Koppelkörper und Ultraschall-Durchflussmessgerät

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1993742A2 (fr) * 2006-03-14 2008-11-26 Endress+Hauser Flowtec AG Dispositif pour déterminer et/ou surveiller le débit volumique ou massique d'une substance dans une conduite tubulaire
DE102010063535A1 (de) 2010-12-20 2012-06-21 Endress + Hauser Flowtec Ag Koppelelement eines Ultraschallwandlers für ein Ultraschall-Durchflussmessgerät
WO2018072926A1 (fr) * 2016-10-19 2018-04-26 Endress+Hauser Flowtec Ag Capteur à ultrasons à clamper destiné à un débitmètre à ultrasons et débitmètre à ultrasons
US20190025112A1 (en) * 2017-07-20 2019-01-24 Diehl Metering Gmbh Measurement module, measurement device and method for determining a fluid quantity
US20190285450A1 (en) * 2018-03-14 2019-09-19 Keyence Corporation Clamp-On Type Ultrasonic Flow Sensor
SE542734C2 (en) * 2019-01-30 2020-06-30 Labtrino Ab Coupling member for clamp on flow metering

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1993742A2 (fr) * 2006-03-14 2008-11-26 Endress+Hauser Flowtec AG Dispositif pour déterminer et/ou surveiller le débit volumique ou massique d'une substance dans une conduite tubulaire
DE102010063535A1 (de) 2010-12-20 2012-06-21 Endress + Hauser Flowtec Ag Koppelelement eines Ultraschallwandlers für ein Ultraschall-Durchflussmessgerät
WO2018072926A1 (fr) * 2016-10-19 2018-04-26 Endress+Hauser Flowtec Ag Capteur à ultrasons à clamper destiné à un débitmètre à ultrasons et débitmètre à ultrasons
US20190025112A1 (en) * 2017-07-20 2019-01-24 Diehl Metering Gmbh Measurement module, measurement device and method for determining a fluid quantity
US20190285450A1 (en) * 2018-03-14 2019-09-19 Keyence Corporation Clamp-On Type Ultrasonic Flow Sensor
SE542734C2 (en) * 2019-01-30 2020-06-30 Labtrino Ab Coupling member for clamp on flow metering

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022120723A1 (de) 2022-08-17 2024-02-22 Endress + Hauser Flowtec Ag Koppelkörper und Ultraschall-Durchflussmessgerät

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