EP2113069A1 - Dispositif pour mesurer le débit volumétrique ou massique d'un milieu dans une canalisation - Google Patents

Dispositif pour mesurer le débit volumétrique ou massique d'un milieu dans une canalisation

Info

Publication number
EP2113069A1
EP2113069A1 EP07857592A EP07857592A EP2113069A1 EP 2113069 A1 EP2113069 A1 EP 2113069A1 EP 07857592 A EP07857592 A EP 07857592A EP 07857592 A EP07857592 A EP 07857592A EP 2113069 A1 EP2113069 A1 EP 2113069A1
Authority
EP
European Patent Office
Prior art keywords
measuring tube
measuring
medium
plug
magnetic field
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Withdrawn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
EP07857592A
Other languages
German (de)
English (en)
Inventor
Arno Lang
Jörg Roth
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 EP2113069A1 publication Critical patent/EP2113069A1/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Withdrawn legal-status Critical Current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
    • 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
    • G01F1/60—Circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/14—Casings, e.g. of special material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/18—Supports or connecting means for meters

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 passes through the measuring tube, essentially generates magnetic field extending transversely to the longitudinal axis of the measuring tube, with at least two measuring electrodes coupling to the medium, which are arranged in a region of the measuring tube lying substantially perpendicular to the magnetic field, and with a control / evaluation unit which uses the measuring voltage induced in the measuring electrodes provides over the volume or mass flow of the medium in the measuring tube.
  • 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, ie where the maximum measuring voltage is expected.
  • the measuring electrodes are usually galvanically coupled to the medium; However, magnetic-inductive flowmeters with capacitively coupling measuring electrodes have also become known.
  • the measuring tube can either be made of an electrically conductive material, For example, be made of stainless steel, or it consists 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 magnetic system, the essential
  • measuring electrodes Components of a magnetic-inductive flowmeter.
  • 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. Stud electrodes have become known, which can be mounted from the outside to the measuring tube, or measuring electrodes with a widened electrode head, which are mounted from the inside of the measuring tube.
  • the invention has for its object to provide a flow meter of high quality, which is easy and inexpensive to manufacture.
  • control / evaluation unit is designed as a plug-in module, which is attachable to the measuring tube via a plug-in mechanism.
  • the plug-in module is designed as a printed circuit board.
  • a magnet system is used, which is designed and arranged so that the resulting magnetic field is highly symmetrical.
  • the magnet system it is also preferable for the magnet system to be at least one plug-in module which can be easily and precisely fastened in the desired position by being placed on the measuring tube.
  • the Device is the control / evaluation associated with an A / D converter, wherein the A / D converter is positioned on the plug-in module or on the printed circuit board that the A / D converter is located in an area in which the of The magnetic field generated by the magnetic system is at least approximately zero. This ensures that the interference-sensitive digitization of the measurement signals can be largely unaffected by the magnetic field.
  • the two measuring electrodes which are arranged in the side regions of the measuring tube, are connected via arranged on the outer wall of the measuring tube connecting lines with the control / evaluation unit.
  • the connecting lines are arranged in a highly symmetrical manner, so that the symmetry of the magnetic field is influenced as little as possible.
  • suitable guides are provided on the outer wall of the measuring tube.
  • the two connecting lines are busbars arranged symmetrically to the measuring tube.
  • An advantageous embodiment of the device according to the invention provides that the plug-in mechanism is designed so that with attaching the plug-in module, the mechanical connection with the measuring tube and the electrical contact with the busbars of the measuring electrodes and / or is made with the connecting lines of the magnet system.
  • the mechanical and electrical contacting of the control / evaluation unit with the busbars, which ensure the electrical connection to the measuring electrodes, preferably takes place via provided on the measuring tube punch and provided on the control / evaluation unit Cardedge plug.
  • Cardedge connectors are well known in connection with the electrical contacting of printed circuit boards.
  • FIG. 1 shows a schematic representation of an embodiment of the device according to the invention
  • FIG. 2 is a perspective view of an embodiment of the measuring tube, which is preferably used in connection with the present invention
  • FIG. 3 shows a schematic representation of a symmetrically constructed from two plug-in modules magnet system with integrated control / evaluation unit
  • FIG. 4 is a plan view of the magnet system according to the marking A in Fig. 3,
  • 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 measuring tube 2 can be configured as desired in a wide range.
  • the measuring tube 2 has a circular cross-section, but it may also have the configuration shown in Fig. 2:
  • the two end portions have a circular cross-section while the central portion has an oval or approximately rectangular cross-section.
  • the medium 11 is electrically conductive at least to a small extent.
  • 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; the liner 17 is preferably made of a material that is highly chemically and / or mechanically resistant.
  • the measuring tube 2 preferably consists of a plastic.
  • a glass fiber reinforced plastic used.
  • it is glass fiber reinforced polyamide or polyphthalamide.
  • 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. Under the influence of the magnetic field B, 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 magnet system preferably consists of two plug-in modules 6, 7, as they can be seen in the figures Fig. 3, Fig. 4 and Fig. 5.
  • the corresponding plug-in modules 6, 7 are shown and described in detail in a filed parallel with the present application parallel application of the applicant in detail.
  • the disclosure directed to the plug-in modules 6, 7 and the measuring tube 2 of the simultaneously filed application is explicitly attributable to the disclosure content of the present application.
  • the two plug-in modules 6, 7 are symmetrical with respect to the measuring tube 2 and are preferably designed mirror-symmetrical.
  • each of the two plug-in modules 6, 7 is U-shaped. It has a central curved area, followed by two free legs.
  • Each plug-in module 6, 7 is composed of a coil core, a bobbin and a coil.
  • the coil core preferably consists of individual mutually insulated coil plates.
  • the bobbin made of plastic is attached as a one-piece or multi-part structure on the spool core
  • a stop edge is provided on the bobbin in the region of the legs, via which the coil in a desired position symmetrically to the central region of the module 6; 7 is fixed.
  • a magnetic field which is constant over the region of the measuring tube 2 can be realized, which in turn is reflected in a good measuring performance of the flowmeter 1.
  • the bobbin 13 is used for electrical insulation and guidance of the electrical connection line 12, 13, 14, 15 and the electrical connections 22.
  • the control / evaluation unit 8 with the Spulenahnordung 6, 7 or connected to the measuring electrodes 4, 5.
  • FIG 5 shows a partial cross section of the flowmeter 1 according to the invention with a plug-in module 6 mounted on the measuring tube 2 on one side.
  • the measuring tube 2 can be seen in cross-section in the middle tapered region 20.
  • the cross-section of the measuring tube 2 is oval in the case shown, wherein the two outer surfaces of the measuring tube 2, against which rest the free legs of the two designed as plug-in modules 6, 7 Spulenan orders, are aligned substantially parallel to each other.
  • both the measuring tube 2 and the coil arrangements 6, 7 can have any other known configuration.
  • the two Measuring electrodes 4, 5 are the two Measuring electrodes 4, 5 arranged.
  • the measuring electrodes 4, 5 are mushroom-shaped electrodes, but in connection with the present invention, all known types of measuring electrodes 4, 5 can be used.
  • the connecting lines 12, 13 are guided by the measuring electrodes 4, 5 to the control / evaluation unit 8 symmetrically on the outer surface of the measuring tube 2.
  • the connecting lines 12, 13 in the case shown are busbars which lie flush against the outer surface of the measuring tube 2.
  • corresponding guides are provided on the outer wall of the measuring tube 2.
  • the control / evaluation unit 8 is designed in the case shown as a printed circuit board 8 and mechanically and electrically adaptable via suitable plug contacts 22, 23 on the measuring tube 2.
  • the electrical connections 22, 23 are provided for the coils of the electromagnets and for the measuring electrodes 4, 5.
  • the control / evaluation unit 8 is electrically and mechanically integrated into the measuring tube 2 or connected to the measuring tube 2.
  • the plug contacts 22, 23 and the sensitive components of the control / evaluation unit 8, in particular the component 24, which carries out the digitization of the measuring signals supplied by the measuring electrodes 4, 5, are arranged in such a way that they are in the mounted state are in a range in which the magnetic field B is at least approximately equal to zero.
  • the A / D converter 24 is in the field-free region, which lies in the middle region of the two symmetrically arranged coils.
  • cover plates 21 are provided. These cover shells 21 can be seen in the open state in FIG. The attachment of the two Abdeckschalen 21 to each other via a clip mechanism 25 which is arranged at corresponding locations of the two cover shells 21.
  • the cover shells 21 may be injection molded parts as well as the measuring tube 2.

Landscapes

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

Abstract

L'invention concerne un dispositif permettant de mesurer le débit volumétrique ou massique d'un milieu (10) dans une canalisation, qui comprend un tube de mesure (2) parcouru par le milieu (10) dans le sens de l'axe longitudinal (3) dudit tube de mesure (2), un système magnétique (6, 7) qui produit un champ magnétique (B) parcourant le tube de mesure (2) et s'étendant sensiblement transversalement à l'axe longitudinal (3) du tube de mesure (2), au moins deux électrodes de mesure (4, 5) à couplage avec le milieu (10), qui sont disposées dans une zone du tube de mesure (2) essentiellement perpendiculairement au champ magnétique, ainsi qu'une unité de régulation et d'évaluation (8) qui fournit, sur la base de la tension de mesure induite dans les électrodes de mesure (4, 5), des informations sur le débit volumétrique ou massique du milieu (10) dans le tube de mesure (2). Selon l'invention, l'unité de régulation et d'évaluation (8) se présente sous forme de module emboîtable pouvant être emboîté sur le tube de mesure (2) par l'intermédiaire d'un mécanisme d'emboîtement (22, 23).
EP07857592A 2006-12-19 2007-12-14 Dispositif pour mesurer le débit volumétrique ou massique d'un milieu dans une canalisation Withdrawn EP2113069A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610060443 DE102006060443A1 (de) 2006-12-19 2006-12-19 Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einer Rohrleitung
PCT/EP2007/063955 WO2008074739A1 (fr) 2006-12-19 2007-12-14 Dispositif pour mesurer le débit volumétrique ou massique d'un milieu dans une canalisation

Publications (1)

Publication Number Publication Date
EP2113069A1 true EP2113069A1 (fr) 2009-11-04

Family

ID=39273372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07857592A Withdrawn EP2113069A1 (fr) 2006-12-19 2007-12-14 Dispositif pour mesurer le débit volumétrique ou massique d'un milieu dans une canalisation

Country Status (3)

Country Link
EP (1) EP2113069A1 (fr)
DE (1) DE102006060443A1 (fr)
WO (1) WO2008074739A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8006569B2 (en) 2009-06-12 2011-08-30 Sensus Usa Inc. Magnetic flow meter
DE102010031433A1 (de) 2010-07-16 2012-01-19 Endress + Hauser Flowtec Ag Einsatz für ein magnetisch-induktives Durchflussmessgerät
DE102013107895A1 (de) * 2013-07-24 2015-01-29 Endress + Hauser Flowtec Ag Durchflussmessgerät
DE102014106567A1 (de) * 2014-05-09 2015-11-12 Endress + Hauser Flowtec Ag Schnellmontage
GB201503481D0 (en) * 2015-03-02 2015-04-15 Coffey Richard And Aquacheck Engineering H Ltd An ultrasonic water meter and a standpipe incorporating same
CN112903041A (zh) * 2021-01-20 2021-06-04 红旗仪表（江苏）有限公司 电磁流量计励磁线圈定型壳体
KR102406733B1 (ko) * 2022-02-28 2022-06-08 주식회사 레오테크 스마트 수도미터

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005002907A1 (de) * 2005-01-21 2006-07-27 Abb Patent Gmbh Magnetisch-induktives Durchflussmessgerät

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098118A (en) * 1977-02-23 1978-07-04 Fischer & Porter Co. Unitary electromagnetic flowmeter
US4881413A (en) * 1988-10-31 1989-11-21 Bio-Medicus, Inc. Blood flow detection device
US5236578A (en) * 1992-07-07 1993-08-17 American Home Water Products Corporation Filter life indicator for water purification system using magnetically actuated switch
GB2333366A (en) * 1998-01-17 1999-07-21 Caledonian Control Technology Encapsulated electromagnetic flowmeter
ITMI20012050A1 (it) * 2001-10-03 2003-04-03 Hemina S P A Misuratore elettromagnetico di portata per linee di convogliamento e di distribuzione di liquidi elettricamente conduttivi
DE10306522A1 (de) * 2003-02-14 2004-08-26 Endress + Hauser Flowtec Ag, Reinach Montagepaket für die Herstellung eines magnetisch-induktiven Durchflußmessers
DE10347878A1 (de) * 2003-10-10 2005-05-04 Abb Patent Gmbh Magnetisch-induktives Messgerät für strömende Stoffe und Verfahren zu dessen Herstellung
DE102005003332B4 (de) * 2005-01-25 2009-08-06 Abb Ag Magnetisch-induktives Durchflussmessgerät

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005002907A1 (de) * 2005-01-21 2006-07-27 Abb Patent Gmbh Magnetisch-induktives Durchflussmessgerät

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2008074739A1 *

Also Published As

Publication number Publication date
DE102006060443A1 (de) 2008-06-26
WO2008074739A1 (fr) 2008-06-26

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