EP2092277A1 - Dispositif de mesure du débit volumique ou du débit massique d'un milieu dans un conduit - Google Patents

Dispositif de mesure du débit volumique ou du débit massique d'un milieu dans un conduit

Info

Publication number
EP2092277A1
EP2092277A1 EP07822637A EP07822637A EP2092277A1 EP 2092277 A1 EP2092277 A1 EP 2092277A1 EP 07822637 A EP07822637 A EP 07822637A EP 07822637 A EP07822637 A EP 07822637A EP 2092277 A1 EP2092277 A1 EP 2092277A1
Authority
EP
European Patent Office
Prior art keywords
measuring
electrode
measuring tube
medium
tube
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Withdrawn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
EP07822637A
Other languages
German (de)
English (en)
Inventor
Frank Voigt
Günther Bähr
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.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
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 and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP2092277A1 publication Critical patent/EP2092277A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G01F1/56—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 using electric or magnetic effects
    • G01F1/58—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 using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/584—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 using electric or magnetic effects by electromagnetic flowmeters constructions of electrodes, accessories therefor

Definitions

  • the invention relates to a device for measuring the volume or mass flow of a medium in a pipeline, with a measuring tube, which is flowed through by the medium in the direction of the longitudinal axis of the measuring tube, with a magnet system which is designed such that it is a the measuring tube passing through, substantially transverse to the measuring tube axis generates magnetic field, with at least one coupling with the medium measuring electrode which is disposed in a substantially perpendicular to the magnetic field in a bore in the wall of the measuring tube, wherein the measuring electrode has an elongated shaft a first coupled to the medium flared end portion which is dimensioned so that its diameter is larger than the bore in the wall of the measuring tube, in which the measuring electrode is placed, and with a control / evaluation, based on the in the at least a measuring electrode induced measuring voltage information about the Volu or mass flow of the medium in the measuring tube delivers.
  • Magnetic-inductive flowmeters exploit the principle of electrodynamic induction for the volumetric flow measurement: vertically induced to a magnetic field charge carriers of the medium induce a measuring voltage in likewise substantially perpendicular to the flow direction of the medium and perpendicular to the direction of the magnetic field arranged measuring electrodes.
  • the measuring voltage induced in the measuring electrodes is proportional to the average flow velocity of the medium over the cross section of the measuring tube; it is therefore proportional to the volume flow. If the density of the medium is known, the mass flow in the pipeline or in the measuring tube can be determined.
  • the measuring voltage is usually tapped via a pair of measuring electrodes, which is arranged with respect to the coordinate along the measuring tube axis in the region of maximum magnetic field strength and where consequently to expect the maximum measuring voltage is.
  • the measuring electrodes are usually galvanically coupled to the medium; However, magnetic-inductive flowmeters with capacitively coupling measuring electrodes have also become known. In the following, reference will be made exclusively to measuring electrodes which are galvanically coupled to the
  • the measuring tube may be made of either an electrically conductive material, e.g. Stainless steel, be made, or it is made of an electrically insulating material. If the measuring tube is made of an electrically conductive material, then it must be lined in the area coming into contact with the medium with a liner made of an electrically insulating material.
  • the liner usually consists of a thermoplastic, a duroplastic or an elastomeric plastic.
  • magnetic-inductive flow meters with a ceramic lining have also become known.
  • the measuring electrodes are in addition to the magnet system, the central
  • measuring electrodes Components of a magnetic-inductive flow sensor.
  • care must be taken that they can be mounted in the measuring tube as simply as possible and that no leakage problems subsequently occur during measuring operation;
  • the measuring electrodes should be distinguished by a sensitive and at the same time low-interference measurement signal acquisition.
  • the configuration of the electrode head is limited by the diameter of the bore: an assembly from the outside is possible if the diameter of the electrode head is smaller than or equal to the diameter of the bore in the wall of the measuring tube, in which the measuring electrode is placed. It is preferable in the case of externally mountable measuring electrodes around pin electrodes, as described, for example, in EP 0 892 252 A1.
  • pin electrodes are used in magnetic-inductive flow meters with small diameters, ie in areas where the installation from the inside due to the small dimensions is difficult or impossible to accomplish.
  • the second type of measuring electrodes eliminates the restriction in
  • the electrode head With regard to the dimensioning of the electrode head; here only the electrode shaft must be designed so that it can be mounted in the hole. Depending on the application, the electrode head can vary within wide limits both in size and in shape.
  • Known internally mountable measuring electrodes usually have e.g. mushroom-shaped or lenticular or plate-shaped electrode heads. Incidentally, both types of measuring electrodes are used by the applicant in their flowmeters.
  • the mushroom-shaped measuring electrode is fastened in a bore of the measuring tube which is lined with an electrically insulating material via a spring assembly and a screw connection.
  • a peripheral edge is provided on the inner surface of the mushroom-shaped electrode head, which presses in the assembled state in the liner material.
  • the sealing effect is achieved by a sharp-edged, frustoconical thickening in the region of the electrode shaft.
  • the attachment of the measuring electrode in the bore via a plate spring and a screw connection.
  • the invention is based on the object, a magnetic-inductive Suggest a flow meter with easy-to-install measuring electrodes.
  • the object is achieved in that in the opposite second end portion of the elongated shaft of the measuring electrode at least one radial recess or a radial elevation is arranged, and that a clamping or latching element is provided which is designed such that it engages with the at least one radial depression or elevation fixes the measuring electrode in the bore of the measuring tube in the axial direction.
  • a clamping or latching element is provided which is designed such that it engages with the at least one radial depression or elevation fixes the measuring electrode in the bore of the measuring tube in the axial direction.
  • a frusto-conical portion in the region of the elongated shaft of the measuring electrode at least a frusto-conical portion is provided which is dimensioned and configured such that the measuring electrode in the bore is anchored in the assembled state in the axial direction.
  • a plurality of frusto-conical sections are provided, which are arranged one behind the other in the longitudinal direction of the shaft. These frusto-conical sections improve the anchoring of the measuring electrode in the bore of the measuring tube and at the same time increase the tightness of the construction.
  • the arrangement of several frustoconical sections in succession achieves an improved sealing effect in the region of the measuring electrode.
  • the measuring tube is made of an electrically conductive material, an electrical insulation between the measuring electrode and the measuring tube is necessary.
  • an electrically insulating, preferably disc-shaped insert is arranged between the measuring tube and clamping element.
  • the insert In the mounted state of the measuring electrode, the insert is supported on the outer wall of the measuring tube.
  • the insert is designed as a sealing element. This prevents that medium can diffuse into the region of the electrical connection of the measuring electrode.
  • the insert in a measuring tube made of an electrically non-conductive material should only develop a sealing effect.
  • the sealing element prevents media from entering the region of the electrical connection via the gap between measuring tube and liner.
  • the widened end portion of the measuring electrode may be designed mushroom-shaped or lenticular or plate-shaped. It goes without saying that also otherwise shaped electrode heads can be used in connection with the invention. In particular, the shape of the electrode head can be optimally adapted to the respective application.
  • an annular edge is provided on the inner surface of the widened electrode head, which pushes in the mounted state of the measuring electrode in the material of the measuring tube or in the liner.
  • FIG. 1 a schematic representation of an embodiment of the inventive magnetic-inductive flowmeter
  • FIG. 2 an enlarged view of the detail marked A in FIG. 1.
  • Fig. 1 shows a schematic representation of an embodiment of the device according to the invention 1.
  • the measuring tube 2 is flowed through by the medium 11 in the direction of the longitudinal axis 3 of the measuring tube 2.
  • the medium 11 is at least to a small extent electrically conductive.
  • the measuring tube 2 is made of an electrically conductive material
  • the measuring tube 2 must be lined on its inner surface with an electrically non-conductive liner 17 (see FIG. 2); the liner 17 is preferably made of a material that is highly chemically and / or mechanically resistant.
  • the alternating magnetic field B oriented perpendicular to the flow direction of the medium 11 is transmitted via a magnet system, e.g. via two diametrically arranged coil arrangements 6, 7 or via two electromagnets.
  • a magnet system e.g. via two diametrically arranged coil arrangements 6, 7 or via two electromagnets.
  • charge carriers located in the medium 11 migrate, depending on the polarity, to the two oppositely poled measuring electrodes 4, 5.
  • the measuring voltage which builds up on the measuring electrodes 4, 5 is proportional to the flow velocity of the medium 11, averaged over the cross section of the measuring tube 2.
  • H. it is a measure of the volume flow of the medium 11 in the measuring tube 2.
  • the measuring tube 2 is incidentally about not shown in Fig. 1 separately connecting elements, for. As flanges, connected to a pipe through which the medium 11 flows.
  • the two measuring electrodes 4, 5 are preferably measuring electrodes, whose end region coming into contact with the medium 11 is widened.
  • the measuring electrodes 4, 5 are connected to the control evaluation unit 8.
  • the control / evaluation unit 8 is connected via the connecting line 16 to an input / output unit 9.
  • the evaluation / control unit 8 is the memory unit 10 assigned.
  • FIG. 2 shows an enlarged view of the section A labeled A in FIG. 1, showing a preferred embodiment of the measuring electrode 4 according to the invention
  • FIG. 5 shows that can be mounted from the inside in the bore 27 of the measuring tube 2.
  • the measuring electrode 4, 5 consists of an elongated electrode shaft 18 and a widened electrode head 19.
  • the electrode head 19 has the shape of a mushroom or lens head.
  • the electrode head 19 may also be plate-shaped.
  • a plurality of frusto-conical sections 20 are provided in succession, so that the electrode shaft 18 has a Christmas tree structure. Since the individual frusto-conical sections 20 are made relatively sharp-edged in their edge region, the measuring electrode 4; 5 anchored in the bore 27 of the liner material 28.
  • the measuring electrode 4; 5 has a press fit in the bore 27. This compression is achieved in that in the end region of the measuring electrode 4; 5, which is not in contact with the medium 11, a roughening, a depression or groove or an elevation 21 is provided, into which engages a resilient clamping element 22 and a clamping element. Preferably, there is a circumferential recess or elevation 21. Between the insulating material 28 and the measuring tube 2 and the clamping element 22 and the clamping disc, a sealing washer 23 is arranged. In the case shown, the sealing disc 23 consists of an electrically insulating material, whereby an electrical insulation between the measuring electrode 4; 5 and the measuring tube 2 is ensured.
  • the measurement performance of the flowmeter 1 according to the invention can be optimized for various applications.
  • - By the arranged in Tannenbaum Jardinoconical sections 20, but possibly also by the annular edge 25 on the inner surface 26 of the widened region and possibly through the sealing washer 23 between clamping element 22 and measuring tube 2 an improved tightness is achieved; the probability of that medium

Landscapes

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

Abstract

L'invention concerne un dispositif de mesure du débit volumique ou du débit massique d'un milieu (11) dans un conduit, avec un tube de mesure (2) qui est traversé par le milieu (11) dans le sens de l'axe longitudinal (3) du tube de mesure (2), avec un système d'aimant (6, 7) qui est conçu de telle sorte qu'il produise un champ magnétique (B) traversant le tube de mesure, évoluant essentiellement sur le plan perpendiculaire à l'axe longitudinal (3) du tube de mesure (2), avec au moins une électrode de mesure (4, 5) couplée au milieu (11) qui est disposée dans une zone placée essentiellement verticalement par rapport au champ magnétique (B) dans un alésage (27) dans la paroi du tube de mesure (2), l'électrode de mesure (4 ; 5) présentant une tige d'électrode longitudinale (18) avec une première zone terminale élargie couplée au milieu (19) qui est dimensionnée de telle sorte que son diamètre (D) soit supérieur au diamètre (d) de l'alésage (27) dans la paroi du tube de mesure (2) dans laquelle l'électrode de mesure (4 ; 5) est placée, et avec une unité de régulation/d'analyse (8) qui délivre des informations sur la base de la tension de mesure (U) induite dans au moins une électrode de mesure (4 ; 5) (U) par le débit volumique ou le débit massique du milieu (11) dans le tube de mesure (2). Dans la deuxième zone terminale opposée de la tige d'électrode (18) de l'électrode de mesure (4 ; 5) est disposée au moins une cavité radiale (21) ou une élévation radiale. En outre est prévu un élément de serrage ou d'arrêt (22) qui est conçu de telle sorte qu'il fixe l'électrode de mesure (4 ; 5), en prise avec au moins une cavité radiale (21) ou une élévation radiale dans l'alésage (27) du tube de mesure (2) en direction axiale.
EP07822637A 2006-11-17 2007-11-15 Dispositif de mesure du débit volumique ou du débit massique d'un milieu dans un conduit Withdrawn EP2092277A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006054635A DE102006054635A1 (de) 2006-11-17 2006-11-17 Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einer Rohrleitung
PCT/EP2007/062397 WO2008059020A1 (fr) 2006-11-17 2007-11-15 Dispositif de mesure du débit volumique ou du débit massique d'un milieu dans un conduit

Publications (1)

Publication Number Publication Date
EP2092277A1 true EP2092277A1 (fr) 2009-08-26

Family

ID=39091821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07822637A Withdrawn EP2092277A1 (fr) 2006-11-17 2007-11-15 Dispositif de mesure du débit volumique ou du débit massique d'un milieu dans un conduit

Country Status (5)

Country Link
US (1) US8051722B2 (fr)
EP (1) EP2092277A1 (fr)
CN (1) CN101542241B (fr)
DE (1) DE102006054635A1 (fr)
WO (1) WO2008059020A1 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005050655A1 (de) * 2005-10-20 2007-04-26 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE102007058898A1 (de) 2007-12-05 2009-06-10 Endress + Hauser Flowtec Ag Elektrode für ein magnetisch-induktives Durchflussmessgerät
DE102008036962A1 (de) * 2008-08-08 2010-02-11 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät mit einer Elektrodenanordnung und Verfahren zu dessen Fertigung
DE102010030229A1 (de) 2010-06-17 2011-12-22 Endress + Hauser Flowtec Ag Verfahren zur Herstellung eines magnetisch-induktiven Durchflussmessgeräts
DE102010038121A1 (de) * 2010-10-12 2012-04-12 Geiger Automotive Gmbh Kontaktstift
DE102011081491A1 (de) 2011-08-24 2013-02-28 Endress + Hauser Flowtec Ag L-Dichtring
JP6157985B2 (ja) * 2013-08-12 2017-07-05 株式会社東芝 電磁流量計
DE102014107200A1 (de) * 2014-05-22 2015-11-26 Endress + Hauser Flowtec Ag Vorrichtung zum Messen des Volumenstroms eines Fluids
GB201416287D0 (en) * 2014-09-15 2014-10-29 Univ Leeds Tomography apparatus, multi-phase flow monitoring system and corresponding methods
US9810559B2 (en) * 2015-03-16 2017-11-07 Invensys Systems, Inc. Systems and methods for detecting leaks in an electromagnetic flowmeter
DE102015113390B4 (de) * 2015-08-13 2022-09-08 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät zur Ermittlung des Vorliegens eines vollausgebildeten rotationssymmetrischen Strömungsprofils
DE102016123123A1 (de) * 2016-11-30 2018-05-30 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
US10330511B2 (en) 2017-06-22 2019-06-25 Saudi Arabian Oil Company Alternating magnetic field flow meters
US10557730B2 (en) 2017-06-22 2020-02-11 Saudi Arabian Oil Company Alternating magnetic field flow meters with embedded quality assurance and control
JP6940392B2 (ja) * 2017-12-15 2021-09-29 アズビル株式会社 電磁流量計の電位検出用電極
DE102018126784A1 (de) * 2018-10-26 2020-04-30 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
US11341830B2 (en) 2020-08-06 2022-05-24 Saudi Arabian Oil Company Infrastructure construction digital integrated twin (ICDIT)
US11687053B2 (en) 2021-03-08 2023-06-27 Saudi Arabian Oil Company Intelligent safety motor control center (ISMCC)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6702477A (fr) 1966-03-02 1967-09-04
DE3562673D1 (en) * 1984-09-29 1988-06-16 Heinrichs Messgeraete Josef Magnetic inductive flow meter
US4911594A (en) 1989-06-21 1990-03-27 Trw Inc. Push-nut type fastener
GB2298716B (en) * 1995-03-10 1998-11-18 Abb Kent Taylor Ltd Flowmeters
US5773723A (en) 1995-09-29 1998-06-30 Lewis; Peter B. Flow tube liner
DE29623770U1 (de) 1995-10-18 1999-08-26 Flowtec Ag Galvanische Elektroden von magnetisch-induktiven Durchflußmessern
DE10312824B4 (de) * 2003-03-22 2007-04-05 Siemens Flow Instruments A/S Magnetisch-induktiver Durchflußmesser

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2008059020A1 *

Also Published As

Publication number Publication date
CN101542241A (zh) 2009-09-23
US8051722B2 (en) 2011-11-08
DE102006054635A1 (de) 2008-05-21
CN101542241B (zh) 2011-08-03
US20100089171A1 (en) 2010-04-15
WO2008059020A1 (fr) 2008-05-22

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