EP1543298A2 - Debitmetre inductif pour fluides electriquement conducteurs - Google Patents

Debitmetre inductif pour fluides electriquement conducteurs

Info

Publication number
EP1543298A2
EP1543298A2 EP03798907A EP03798907A EP1543298A2 EP 1543298 A2 EP1543298 A2 EP 1543298A2 EP 03798907 A EP03798907 A EP 03798907A EP 03798907 A EP03798907 A EP 03798907A EP 1543298 A2 EP1543298 A2 EP 1543298A2
Authority
EP
European Patent Office
Prior art keywords
flow channel
active surface
flow
magnetic field
flow meter
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Withdrawn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
EP03798907A
Other languages
German (de)
English (en)
Inventor
Andres Ketelsen
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.)
Ketelsen Broder
Original Assignee
Ketelsen Broder
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 Ketelsen Broder filed Critical Ketelsen Broder
Publication of EP1543298A2 publication Critical patent/EP1543298A2/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Withdrawn legal-status Critical Current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
    • G01F1/588—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 combined constructions of electrodes, coils or magnetic circuits, accessories therefor

Definitions

  • the invention relates to inductive flow meters with the features of
  • Flow meters of the type considered here serve to determine the flow of electrically conductive liquids through channels or pipes, in particular a circular cross section.
  • punctiform electrodes are provided at opposite points of a channel cross section, which electrodes are electrically coupled to the electrically conductive liquid, in particular are exposed to the channel interior and take up a conductive connection to the conductive liquid.
  • the field lines of a magnetic field which is generated by a permanent magnet arrangement or in particular by a coil arrangement, run perpendicular to the connecting line between the electrodes and perpendicular to the flow lines of the liquid flowing through the channel or the tube.
  • Conductor paths which run from one point-shaped electrode to the other point-shaped electrode and on which the pipe section or channel section containing the electrodes penetrate the entire pipe cross section or channel cross section can, if the conductive liquid moves along the channel or pipe, as conductors moving in the magnetic field are understood, in which voltages are induced due to the liquid flow, which are taken from the punctiform electrodes via connections led through the insulating channel wall or tube wall and which are a measure of the flow of the conductive liquid through the tube or the channel.
  • the output signal of an inductive flow meter of the type described above, which can be taken from the electrodes must be given as follows:
  • the integral over the volume is determined by the respective product value of
  • Vectors of three vector fields are formed, of which B is the magnetic induction in the flow channel section in the cylinder space delimited by the flow channel section with the inner channel cross section and with a certain length upstream and downstream of the radial plane containing the electrodes, and W denotes a valence vector field, including a field from Vectors in the previously defined cylinder space are to be understood, which characterize the configuration of the conductor paths between the electrodes in the cylinder space. Finally, v denotes the vector field in the cylinder space mentioned with vectors corresponding to the speeds of the particles of the conductive liquid.
  • the partial product B x W would be constant, such that non-uniform and / or asymmetrical velocity distributions of the flow of the electrically conductive liquid to be examined through the flow channel section do not lead to falsifications of the measured values.
  • the magnetic field of the magnetic field generation system can be designed with some effort so that it is essentially homogeneous in the area of the interior of the flow channel section, while in the case of a flow channel section which is round in cross section and diametrically opposed to one another, the valence vector field is by no means homogeneous in essentially punctiform electrodes.
  • the following consideration shows this without further ado:
  • Characteristic flows in the flow channel section of an inductive flow meter if they are laminar, have an undisturbed speed profile in the undisturbed state with respect to the flow channel center axis or, in the case of an asymmetrical fault, have a flow profile whose maximum is laterally offset in the radial direction with respect to the flow channel center axis.
  • the flow can become turbulent in such a way that the flow profile has a plateau region with respect to the flow channel cross section and regions of lower flow velocity near the edge.
  • German Patent 1,295,223 proposes that the magnet arrangement, that is to say the magnetic field generation system, be designed in such a way that the field component decreases in the radial plane containing the electrodes and in planes parallel to it in the direction of the connecting line between the electrodes from the inside to the outside.
  • the resultant structure of the entire device is comparatively complicated, the parts of the magnet system located in the vicinity of the electrodes, which act directly on the area of very large line path densities, require very precise assembly and extremely fine adjustment.
  • Flow channel section can be reached.
  • the present invention is accordingly based on the object of designing an inductive flow meter of the general type considered here in such a way that, with a comparatively simple construction and simple manufacture of the magnetic field generation system, considerably improved insensitivity to measured value falsifications due to changes in the flow profile in the flow channel cross-section which are dependent on the flow speed or due to asymmetries in the flow profile relative to the flow channel central axis is reached.
  • Figure 1 is a partially sectioned perspective view of an inductive flow meter of the general type considered here for explaining terms and geometric relationships.
  • Fig. 2 is a perspective view of part of an inductive
  • Fig. 3 is a perspective view of part of an inductive
  • Fig .4 is a perspective view of a part of an inductive
  • FIG. 5 shows a schematic perspective view of an inductive flow meter of the type specified here with a magnetic field generation system formed from field coils;
  • FIG. 6 shows a schematic perspective view of an inductive flow meter of the type specified here with a magnetic field generation system formed from a magnetic closing circuit with pole shoes;
  • Measuring electrodes up to a measuring electrode for various embodiments of an inductive flow meter of the type specified here.
  • Flow meter of the general type considered here contains a flow channel section 1 in the form of a tube made of electrically insulating material.
  • the central longitudinal axis of the flow channel section 1 is designated Z.
  • In the middle of the longitudinal extent of the flow channel section 1 are located diametrically opposed locations across the respective flow channel cross-section, for example, approximately point-shaped measuring electrodes 2 and 3, which are connected to a voltage measuring device 6 via measuring lines 4 and 5, which extend through the wall of the electrically insulating flow channel section 1.
  • the measuring electrodes 2 and 3 can be located on the inside of the The flow channel section 1 directly connects to the electrically conductive liquid flowing through the flow channel section 1 or, in the case of the AC excitation of a magnetic field product system of the inductive flow meter known to the person skilled in the art, be capacitively coupled to the electrically conductive liquid, so that the measuring electrodes in this case are connected to the inside of the flow channel 1 need not be exposed
  • the distance of the cross-sectional plane of the flow channel section 1 containing the measuring electrodes 2 and 3 from its upstream end and its s the end located downstream of it is denoted by z
  • FIG. 1 a magnetic field generation system 7 is indicated in FIG. 1 by block symbols.
  • This generates an induction vector field B represented by vectors of magnetic induction, the magnetic field lines penetrating the wall of the flow channel section 1 and its interior and essentially perpendicular to the central axis Z and perpendicular to the measuring electrodes 2 and 3 connecting diameter of the flow channel cross section
  • the length of the interior of the flow channel section 1 of FIG. 2z considered here is selected to be approximately equal to the diameter of the flow channel cross section.
  • a magnetic field generated by the magnetic field generation system 7 is initially assumed to be homogeneous in the entire interior of the flow channel section 1 for the purposes of explanation in connection with FIG. 1 an electrically conductive liquid through the interior of the flow channel Section 1, the flow particles of the liquid have speeds corresponding to the individual speed vectors of a vector field v parallel to the central longitudinal axis Z
  • a large number of the guiding threads passing through the entire interior of the flow channel section 1 both over the channel cross section and over the length of the flow channel section 1 are indicated by dashed lines w in FIG. 1. If the electrically conductive liquid moves through the flow channel section 1 in accordance with the speed vector field v, then the conductor paths are to be understood according to the lines w as conductors moved in the magnetic field, in which electromotive forces are induced in each case due to the movement of the conductor paths, such that that finally a resulting induced measuring voltage is present between the measuring electrodes 2 and 3, which is measured by the measuring device 6 and is related to the flow rate per unit time of the electrically conductive liquid.
  • the electromotive forces induced in the individual conductive threads contribute in different degrees to the measurement signal S which can finally be read off the measuring device 6.
  • value vector field is the one for Induction of electromotive forces responsible orientation components take into account the guide path.
  • the signal S readable on the voltage measuring device 6 can be expressed as follows:
  • Fig. 2 shows a vector field v of the speed distribution over the
  • Flow channel cross-section in which there is no rotational symmetry of the flow profile with respect to the central longitudinal axis Z of the flow channel section 1.
  • the range of maximum speed vectors of the vector field v is asymmetrically offset downwards with respect to the central longitudinal axis Z.
  • This speed distribution can result, for example, from the fact that there are flow obstacles, for example valve spools, pipe elbows and the like, in channel sections which are connected upstream of the flow channel section 1, which cause, for example, that in the lower quadrant of the Pipe cross-section are the maximum flow vectors of the flow distribution.
  • the range of the maximum can, however, also lie in other quadrants, for example in a cross-sectional quadrant to which the measuring electrode 2 is adjacent, or in a cross-sectional quadrant which is adjacent to the apex of the flow channel section 1, or also in the cross-sectional quadrant to which the measuring electrode 3 is adjacent ,
  • FIG. 3 shows a situation in which a transition from the laminar flow (see FIG. 4) to a turbulent flow has occurred due to the high flow velocity in the flow channel section 1.
  • the flow profile is approximated to a trapezoidal shape, with boundary layers of low flow velocity having a relatively low radial thickness.
  • the flow profile of the vector field v has the shape of a paraboloid of revolution symmetrical to the central longitudinal axis Z.
  • active surface arrangements being the flat structures to which the field lines of the magnetic field generation system penetrate the flow channel inner wall.
  • active surface arrangements lie on the inner wall of the flow channel between the measuring electrodes and extend circumferentially in accordance with the wrap angle of pole pieces or field coil arrangements with reference to the flow channel circumference, and in the axial direction in accordance with the axial extension of pole pieces or field coil arrangements symmetrically upstream and downstream of the measuring electrode points containing flow channel section radial cross section.
  • FIGS. 5 and 6 For this purpose, the following should be carried out using FIGS. 5 and 6:
  • Fig. 5 shows an embodiment in which the magnetic field generation system assigned to the flow channel section 1 and the measuring electrodes 2 and 3 in the manner shown is formed by two field coils 7L which nestle against the outer circumferential surface of the flow channel section 1 in the manner shown, in each other diametrically opposite areas are located between the measuring electrodes 2 and 3 and which span a wrap angle denoted in FIG. 5 with 2 ⁇ 0 .
  • the axial extension of the field coils 7L is in each case b in a symmetrical position with respect to the radial plane containing the measuring electrodes 2 and 3.
  • FIG. 6 shows a highly schematic perspective view of an inductive flow meter with a closing circuit 20 which forms the magnetic field generation system and which has an excitation (not shown).
  • gerspule and which has pole shoes 7P opposite each other via the flow channel section 1, which are in turn symmetrical with respect to the axial extent to the radial plane containing the measuring electrode points and have an axial extension b, while in the circumferential direction they have the round flow channel section 1 surrounded with a wrap angle of 2 ⁇ 0 each, as is shown in Fig. 6 by dash-dotted lines.
  • the possible shapes of the active surface arrangements can be derived from developments of the cylindrical inner wall of the flow channel section 1 in the circumferential area between the cylinder surface line located centrally between the measurement electrodes 2 and 3 and the cylinder surface line passing through one of the measurement electrodes, for example through the measurement electrode 3, as shown in the diagrams in FIG. 7A to 7F.
  • the active surface arrangement is denoted by Fa and corresponds qualitatively to that magnetic field line passage surface that is generated by the field coil arrangement 7L according to FIG. 5 in a quadrant of the flow channel inner surface.
  • the active surface arrangements Fb are constricted by means of constrictions due to the corresponding design of the field coils 7L in the areas of greater wrap angle, so that the concave areas K are enlarged.
  • the active surface arrangements Fb are still self-contained.
  • the active surface arrangements can also be formed by separate flat structures Fc, which means that in a certain wrap angle range gerer extension a main field coil is provided, to each of which there are small auxiliary field coils in larger wrap angle ranges in the direction of the measuring electrodes 2 and 3 with the same sense of winding as that of the main field coil.
  • the concave area K between the boundary lines of the active surface arrangement Fc and the tangential delimiting straight lines T1 and T2 can be increased if this is desirable in certain cases.
  • circumferential extent of the active surface arrangements Fa or Fb or Fc corresponding to the wrap angle 2 ⁇ 0 of the associated field coil arrangement 7L is in the range of at least 120 °, preferably more than 140 °, wrap angle ranges over 140 ° being too surprising good results.
  • the active surface arrangements Fa or Fb or Fc have their center of gravity closer to the circumferential center of the flow channel inner surface between the measuring electrodes, while those parts of the active surface arrangements which further towards the Extend measuring electrodes 2 or 3 and have a lower weight per unit area.
  • the active surface arrangements are being developed as they are from field coil arrangements 7L according to FIG. 5 7D shows the development over a quadrant of an active surface arrangement Fd, as is defined, for example, by the pole shoe arrangement 7P of the magnetic closing circuit 20 from FIG. 6.
  • tangential delimitation lines T1 and T2 placed on the active surface arrangement Fd converge, which touch the active surface arrangement Fd in two points from the outside in pairs, in the direction of the respective location of the measuring electrodes, in the present case, therefore, of the location of the measuring electrode 3.
  • FIG. 7E shows an active surface arrangement Fe, in which separate active surface elements interact.
  • an active surface arrangement can be defined by pole shoes, which, in contrast to the arrangement according to FIG. 6, has separate auxiliary pole shoes instead of the one-piece narrow pole shoe webs, which are located on both sides of main pole shoes between these and the measuring electrodes on the respective peripheral surface n of the flow channel section 1 and are equally flooded with reference to the main pole pieces.
  • the concave regions K have a greater extent in the formation of the active surface arrangement Fe than in the embodiment according to FIG. 7D.
  • FIG. 7F shows the possibility of arranging sub-active surfaces Fu symmetrically on both sides of a main active-surface element in the case of active surfaces that are not self-contained, for example in the manner of FIGS. 7C or 7E, by the field lines occur from magnetic fields which are oriented opposite to the field lines penetrating the active surface arrangements and which are generated by additional magnetic field generation systems which generate magnetic Set closing circuits or additional field coil arrangements included.
  • a further improvement in the compensation can be achieved here for certain characteristic distortions of the flow velocity field in the flow channel cross section. It is essential, however, that the active surface arrangement element closest to the respective measuring electrode is penetrated by field lines which correspond in orientation to those of the main active surface arrangement element.

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

Abstract

L'invention concerne un débitmètre inductif pour fluides électriquement conducteurs comportant une section de conduite d'écoulement isolante de section circulaire, une paire d'électrodes diamétralement opposées et électriquement couplées par le fluide électriquement conducteur, et un système de génération de champ magnétique. Ce système de génération de champ magnétique comprend la section de conduite d'écoulement à angle de contact déterminé et il génère un champ magnétique à orientation de ligne de champ sensiblement perpendiculaire aux droites de liaison entre les électrodes de mesure et perpendiculaire à l'axe longitudinal de la conduite d'écoulement. L'invention vise à augmenter l'insensibilité à des valeurs de mesure faussées en raison de modifications du profil d'écoulement dans la section de conduite dépendantes de la vitesse d'écoulement ou bien en raison d'un profil d'écoulement asymétrique relativement à l'axe médian de la conduite d'écoulement. A cet effet, des ensembles de surfaces actives, notamment des éléments plats, sur lesquels les lignes de champ du système de génération de champ magnétique traversent de manière limitée la paroi intérieure de la conduite d'écoulement, sont mesurés de telle manière que, dans une représentation de la paroi intérieure de la conduite d'écoulement, des droites de référence tangentielles placées sur les ensembles de surfaces actives convergent par paires en direction de l'emplacement des électrodes correspondantes, ces droites tangentielles étant incidentes de l'extérieur en deux points avec les ensembles de surfaces actives. Entre deux points de contact se trouvent des zones concaves où les lignes de délimitation des ensembles de surfaces actives n'ont aucun point de contact avec les droites limitatives tangentielles.
EP03798907A 2002-09-25 2003-09-16 Debitmetre inductif pour fluides electriquement conducteurs Withdrawn EP1543298A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10244647 2002-09-25
DE10244647A DE10244647A1 (de) 2002-09-25 2002-09-25 Induktiver Durchflußmesser für elektrisch leitfähige Flüssigkeiten
PCT/EP2003/010297 WO2004031698A2 (fr) 2002-09-25 2003-09-16 Debitmetre inductif pour fluides electriquement conducteurs

Publications (1)

Publication Number Publication Date
EP1543298A2 true EP1543298A2 (fr) 2005-06-22

Family

ID=31984060

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03798907A Withdrawn EP1543298A2 (fr) 2002-09-25 2003-09-16 Debitmetre inductif pour fluides electriquement conducteurs

Country Status (6)

Country Link
US (1) US7287435B2 (fr)
EP (1) EP1543298A2 (fr)
AU (1) AU2003266393A1 (fr)
CA (1) CA2500096A1 (fr)
DE (1) DE10244647A1 (fr)
WO (1) WO2004031698A2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH701728B1 (de) * 2005-12-06 2011-03-15 Digmesa Ag Ultraschallmessanordnung mit einer Ultraschallmessstrecke aus Kunststoff, Verfahren zur Durchflussmessung und Verfahren zur Herstellung einer Ultraschallmessstrecke.
WO2009152434A2 (fr) * 2008-06-13 2009-12-17 University Of Utah Research Foundation Procédé et appareil pour mesurer des champs magnétiques
US8006569B2 (en) * 2009-06-12 2011-08-30 Sensus Usa Inc. Magnetic flow meter
DE102009045539A1 (de) 2009-10-09 2011-04-14 Endress + Hauser Flowtec Ag Magnetisch-induktive Durchflussmesseinrichtung mit mehreren Magnetspulen und Verfahren zum Betreiben derselben
US8434371B2 (en) 2010-10-14 2013-05-07 Brickhouse Innovations, Llc Electromagnetic fluid velocity sensor with adjustable electrodes
DE102012102979A1 (de) * 2012-04-05 2013-10-24 Endress + Hauser Flowtec Ag Durchflussmessgerät, Messrohr sowie Verfahren zur Herstellung eines Durchflussmessgeräts
DE102014111047B4 (de) * 2014-08-04 2016-02-11 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät mit mehreren Messelektrodenpaaren und unterschiedlichen Messrohrquerschnitten und Verfahren zur Messung des Durchflusses
US9714855B2 (en) * 2015-01-26 2017-07-25 Arad Ltd. Ultrasonic water meter
DE102018132935A1 (de) * 2018-12-19 2020-06-25 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät und Messstelle
DE102020116004B3 (de) * 2020-06-17 2021-09-23 Endress+Hauser Flowtec Ag Magnetisch-induktive Durchflussmesssonde

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1295223C2 (de) * 1964-11-06 1974-07-11 Fischer & Porter GmbH, 3401 Groß E11 er shau s en Nach dem induktionsverfahren arbeitende stroemungsmesseinrichtung
DE1573066A1 (de) * 1966-02-11 1970-10-22 Rheometron Gmbh Induktions-Messgeraet fuer Fluessigkeitsstroemungen
GB1551007A (en) * 1975-05-27 1979-08-22 Wyatt Dg Fluid flow meters
DE4002030A1 (de) * 1990-01-24 1991-07-25 Broder Ketelsen Induktiver durchflussmesser
DE19604004C1 (de) * 1996-02-05 1997-06-05 Elsag Int Nv Magnetisch-induktiver Durchflußmesser
US6865956B2 (en) * 2001-09-20 2005-03-15 Yamatake Corporation Electromagnetic flowmeter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004031698A3 *

Also Published As

Publication number Publication date
WO2004031698A2 (fr) 2004-04-15
DE10244647A1 (de) 2004-04-08
AU2003266393A8 (en) 2004-04-23
US7287435B2 (en) 2007-10-30
US20060144160A1 (en) 2006-07-06
CA2500096A1 (fr) 2004-04-15
WO2004031698A3 (fr) 2004-08-19
AU2003266393A1 (en) 2004-04-23

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