WO2007110310A1 - Magnetoinductive flowmeter - Google Patents

Magnetoinductive flowmeter Download PDF

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Publication number
WO2007110310A1
WO2007110310A1 PCT/EP2007/052210 EP2007052210W WO2007110310A1 WO 2007110310 A1 WO2007110310 A1 WO 2007110310A1 EP 2007052210 W EP2007052210 W EP 2007052210W WO 2007110310 A1 WO2007110310 A1 WO 2007110310A1
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WIPO (PCT)
Prior art keywords
measuring tube
measuring
magnetic
medium
magnetic field
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PCT/EP2007/052210
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German (de)
French (fr)
Inventor
Fred Kappertz
Original Assignee
Endress+Hauser Flowtec Ag
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Publication of WO2007110310A1 publication Critical patent/WO2007110310A1/en

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    • 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
    • G01F1/586—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 coils, magnetic circuits, accessories therefor

Definitions

  • the invention relates to a device for measuring the volume or
  • Mass flow of a medium which flows through a measuring tube in the direction of the measuring tube axis with a magnet assembly and pole pieces, which are shaped and arranged so that in the measuring tube, a homogeneous measuring magnetic field is generated with substantially transverse to the measuring tube axis magnetic field lines, and with a arranged in the outer region of the measuring tube baffle for guiding the magnetic field in the outer space of the measuring tube, with at least one coupled to the medium measuring electrode which is arranged in a side region of the measuring tube, and with a control / evaluation, which induced by means of the at least one measuring electrode Measuring voltage provides information about the volume or mass flow of the medium in the measuring tube.
  • the at least one measuring electrode is galvanically or capacitively coupled to the measuring medium.
  • This measuring voltage induced in the measuring electrodes is proportional to the mean 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 of the medium can still be determined.
  • the signal strength of the measurement voltage measured at at least one measuring electrode depends crucially on the field strength of the measuring magnetic field, i. the magnetic field, the periodically alternating passes through the interior of the measuring tube.
  • a known measure is the arrangement of a baffle in the outer space of the measuring tube. This baffle surrounds the measuring tube circumferentially and is designed so that the magnetic field in the outer space of the measuring tube is guided and substantially within a limited space is passed into the medium flowed through the interior of the measuring tube. Furthermore, interference fields from the surroundings of the magnetically inductive flowmeter are suppressed by the guide plate. In general, it can be said that the guide plate is used to reduce interference or stray fields.
  • Measuring tube is achieved via appropriately adapted to the diameter of the measuring tube pole pieces. As a result, the measuring voltages supplied by the electromagnetic flowmeter are largely independent of the flow profile of the medium flowing through the measuring tube.
  • the invention has for its object to propose a magneto-inductive flowmeter with an increased efficiency.
  • the object is achieved in that at least a first shield between pole piece and baffle is arranged such that in the area between the pole piece and baffle of the magnetic resistance is increased.
  • the magnet assembly to two with respect to the measuring tube diametrically opposite electromagnets, consisting of coil assemblies and pole pieces.
  • the arrangement of a flat, adapted to the respective geometry of the measuring tube shape of the first shielding in the side regions of each electromagnet between the pole piece and baffle virtual enlargement of the air gap between the pole piece and baffle is achieved - or in other words, the magnetic resistance in these areas elevated.
  • the magnetic field lines increase the path through the baffle in the outer space of the measuring tube and close by taking the direct path through the measuring tube.
  • the magnetic shunts are drastically reduced by the inventive arrangement of shielding in the area between pole pieces and baffle or in the outer region of the coil assembly.
  • a second shielding element is provided in the radial direction above each magnet arrangement.
  • the second shielding elements are arranged outside the guide plate and each serve to reduce the stray field of the magnet arrangement, since the magnetic resistance in the outer space of the measuring tube is also increased by it.
  • the magnetic field lines are thereby preferably forced to the direct path over the interior of the measuring tube.
  • this design effectively shields magnetic interference fields located in the vicinity of the flowmeter.
  • the shielding element is made of a diamagnetic material.
  • the shielding element itself has a continuous surface, or it is formed as a grid.
  • the diamagnetic material may be, for example, bismuth or graphite.
  • the shielding element is made of a superconducting material. Since a superconducting material has a near-infinity magnetic resistance, such a solution achieves a very high efficiency.
  • FIG. 1 is a schematic representation of an embodiment of the magnetic inductive flowmeter according to the invention
  • Fig. 2 is a schematic representation of a section of a known magnetic-inductive flowmeter with a sketch of the course of the magnetic field lines and
  • FIG. 3 is a schematic representation of a section of an embodiment of the flowmeter according to the invention with a sketch of the course of the Magnetic field lines.
  • Fig. 1 shows a schematic representation of a first embodiment of the device 1 according to the invention.
  • the measuring tube 2 is flowed through by the medium 11 in the direction of the measuring tube axis 3.
  • the medium 11 is at least to a small extent electrically conductive.
  • the measuring tube 2 itself is made of a non-conductive material, or it is lined at least on its inner surface with a non-conductive material.
  • the perpendicular to the flow direction of the medium 11 aligned magnetic field B is generated via the diametrically arranged coil assembly 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 measuring tube 2 is incidentally via connecting elements, for. As flanges, which are not shown separately in the drawing, connected to a pipe system through which the medium 11 passes.
  • the measuring electrodes 4, 5 are in direct contact with the medium 11;
  • the coupling can also be capacitive.
  • the connection between the coil arrangements 6, 7 and the control / evaluation unit 8 takes place via the connection lines 14, 15.
  • the control / evaluation unit 8 is connected via the connection line 16 to an input / output unit 9.
  • the evaluation / control unit 8 is associated with the memory unit 10.
  • FIG. 2 is a schematic representation of a section of a known magnetic-inductive flow meter 1 is shown with a sketch of the course of the magnetic field lines. 3 shows the analog representation in a preferred embodiment of the flowmeter 1 according to the invention.
  • the magnetic field B is generated in both cases via the two diametrically opposite magnet arrangements 6, 7.
  • a magnet assembly 6; 7 consists in the case shown of an electromagnet and a pole piece 17, 18, which is adapted to the measuring tube 2 in terms of its shape.
  • the pole shoes 17, 18 are shaped so that the magnetic field B, that of the medium 11th flowed through measuring tube 2 interspersed, is as homogeneous as possible.
  • the magnetic field B is only partially sketched in both drawings Fig. 2 and Fig. 3.
  • Guide plate 21 each have a relatively strong feedback of the magnetic field lines in the area between pole piece 17; 18 and the corresponding adjacent areas of the baffle 21. In particular, therefore, the run at the respective bottom of your pole piece 17; 18 leaking magnetic field lines not only on the medium 11 to the opposite pole piece 18; 17, but a part of the magnetic field lines closes over the air gap between the pole piece 17, 18 and baffle 21, whereby a considerable part of the magnetic field lines does not - as desired - the way through the measuring tube 2 takes. The magnetic efficiency is therefore relatively low in the known magnetic-inductive flowmeters.
  • Fig. 3 shows a schematic representation of a section of a preferred embodiment
  • both first shielding elements 19a, 19b, 19c, 19d and second shielding elements 20a, 20b are provided. It goes without saying that in certain applications, only the first shielding elements 19a, 19b, 19c, 19d or only the second shielding elements 20a, 20b are sufficient.
  • diamagnetic sheets or shielding elements 19a, 19b, 19c, 19d are respectively mounted in the lateral regions of the two electromagnets 6, 7 between the pole shoes 17, 18 and the baffle 21. These have a shape that is adapted to the particular shape of the measuring tube 2. In the case shown, they are angled sheets of bismuth or graphite.
  • a shield 19a, 19b, 19c, 19d; 20a, 20b can be provided with a diamagnetic coating.
  • shielding elements 19a, 19b, 19c, 19d; 20a, 20b of superconducting material in terms of their ability to block magnetic field lines entirely, ideal for the inventive solution.
  • the shielding 19a, 19b, 19c, 19d via not shown in Fig. 3 screw connections to the baffle 21 or to the pole pieces 17, 18 are attached.
  • a second shielding element 20a, 20b is in each case arranged behind a magnet arrangement 6, 7, viewed in the radial direction.
  • the magnetic resistance is determined by the arrangement of the diamagnetic
  • Shielding elements 19a, 19b, 19c, 19d; 20a, 20b considerably increased in the corresponding room areas.
  • the magnetic field lines become more or less the same for the measuring Performance optimal way redirected through the measuring tube 2.
  • the magnetic efficiency is increased.
  • the inventive arrangement of the shielding 19a, 19b, 19c, 19d; 20a, 20b and thus achieved better efficiency can be used cost-effective components for generating the magnetic field.
  • a magnetic inductive flow meter according to the invention can be manufactured relative to a comparable conventional flow meter with reduced production costs.

Abstract

The invention relates to an apparatus for measuring the volume flow or mass flow of a medium (11) which flows through a measuring tube (2) in the direction of the measuring tube axis (3), said apparatus having a magnet arrangement (6, 7) having pole shoes (17, 18) which are shaped and arranged in such a manner that a homogeneous magnetic measurement field having magnetic lines of force which run essentially transverse to the measuring tube axis (3) is generated in the measuring tube (2), and having a guide plate (21) which is arranged in the outer region of the measuring tube (2) and is intended to guide the magnetic field (B) in the outer space of the measuring tube (2), having at least one measurement electrode (4, 5) which is coupled to the medium (11) and is arranged in a side region of the measuring tube (2), and having a control/evaluation unit (8) which uses the measurement voltage induced in the at least one measurement electrode (4, 5) to provide information relating to the volume flow or mass flow of the medium (11) in the measuring tube (2). In order to increase the efficiency of the flowmeter (1), at least one first screening element (19a, 19b, 19c, 19d) is arranged between a pole shoe (17; 18) and the guide plate (21) in such a manner that the magnetic resistance is increased in the region between the pole shoe (17; 18) and the guide plate (21), thus reducing magnetic stray fields in the outer space of the measuring tube (2) and increasing the field strength of the magnetic measurement field (B).

Description

Beschreibung description
MAGNETISCH-INDUKTIVES DURCHFLUSSMESSGERÄTMAGNETIC-INDUCTIVE FLOW METER
[0001] Die Erfindung betrifft eine Vorrichtung zum Messen des Volumen- oderThe invention relates to a device for measuring the volume or
Massestroms eines Mediums, das ein Messrohr in Richtung der Messrohr-achse durchströmt, mit einer Magnetanordnung und Polschuhen, die so geformt und angeordnet sind, dass im Messrohr ein homogenes Mess-Magnetfeld mit im wesentlichen quer zur Messrohrachse verlaufenden Magnetfeldlinien erzeugt wird, und mit einem im Außenbereich des Messrohres angeordneten Leitblech zur Führung des Magnetfeldes im Außenraum des Messrohres, mit zumindest einer mit dem Medium gekoppelten Messelektrode, die in einem Seitenbereich des Messohres angeordnet ist, und mit einer Regel-/Auswerteeinheit, die anhand der in die zumindest eine Messelektrode induzierten Messspannung Information über den Volumen- oder Massestrom des Mediums in dem Messrohr liefert. Die zumindest eine Messelektrode ist mit dem Messmedium galvanisch oder kapazitiv gekoppelt.Mass flow of a medium which flows through a measuring tube in the direction of the measuring tube axis, with a magnet assembly and pole pieces, which are shaped and arranged so that in the measuring tube, a homogeneous measuring magnetic field is generated with substantially transverse to the measuring tube axis magnetic field lines, and with a arranged in the outer region of the measuring tube baffle for guiding the magnetic field in the outer space of the measuring tube, with at least one coupled to the medium measuring electrode which is arranged in a side region of the measuring tube, and with a control / evaluation, which induced by means of the at least one measuring electrode Measuring voltage provides information about the volume or mass flow of the medium in the measuring tube. The at least one measuring electrode is galvanically or capacitively coupled to the measuring medium.
[0002] Magnetisch-induktive Durchflussmessgeräte nutzen für die volumetrischeMagnetic-inductive flowmeters use for the volumetric
Strömungsmessung das Prinzip der elektrodynamischen Induktion aus: Senkrecht zu einem Magnetfeld bewegte Ladungsträger des Mediums induzieren in gleichfalls im wesentlichen senkrecht zur Strömungsrichtung des Mediums angeordnete Messelektroden eine Messspannung. Diese in die Messelektroden induzierte Messspannung ist proportional zu der über den Querschnitt des Messrohres gemittelten Strömungsgeschwindigkeit des Mediums; sie ist also proportional zum Volumenstrom. Ist die Dichte des Mediums bekannt, lässt sich weiterhin der Massestrom des Mediums bestimmen.Flow measurement, the principle of electrodynamic induction from: perpendicular to a magnetic field moving charge carriers of the medium induce in likewise substantially perpendicular to the flow direction of the medium arranged measuring electrodes, a measuring voltage. This measuring voltage induced in the measuring electrodes is proportional to the mean 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 of the medium can still be determined.
[0003] Bei einem magnetisch-induktiven Durchflussmessgerät hängt die Signalstärke der an zumindest einer Messelektrode gemessenen Messspannung entscheidend von der Feldstärke des Mess-Magnetfeldes ab, d.h. des Magnetfeldes, das periodisch alternierend den Innenraum des Messrohres durchsetzt.In a magnetic-inductive flowmeter, the signal strength of the measurement voltage measured at at least one measuring electrode depends crucially on the field strength of the measuring magnetic field, i. the magnetic field, the periodically alternating passes through the interior of the measuring tube.
[0004] Bei der Konstruktion eines magnetisch-induktiven Durchflussmessgeräts werden stets Maßnahmen getroffen, die dazu dienen, das Magnetfeld weitgehend auf den Innenraum des Messrohres zu konzentrieren. Eine bekannte Maßnahme ist die Anordnung eines Leitbleches im Außenraum des Messrohres. Dieses Leitblech umgibt das Messrohr umfänglich und ist so ausgestaltet, dass das Magnetfeld im Außenraum des Messrohres im wesentlichen innerhalb eines begrenzten Raumbereichs geführt und in den vom Medium durchströmten Innenbereich des Messrohres geleitet wird. Weiterhin werden durch das Leitblech Störfelder aus der Umgebung des magnetischinduktiven Durchflussmessgeräts unterdrückt. Generell lässt sich sagen, dass das Leitblech dazu dient, Stör- oder Streufelder zu reduzieren.In the construction of a magnetic-inductive flowmeter measures are always taken, which serve to concentrate the magnetic field largely on the interior of the measuring tube. A known measure is the arrangement of a baffle in the outer space of the measuring tube. This baffle surrounds the measuring tube circumferentially and is designed so that the magnetic field in the outer space of the measuring tube is guided and substantially within a limited space is passed into the medium flowed through the interior of the measuring tube. Furthermore, interference fields from the surroundings of the magnetically inductive flowmeter are suppressed by the guide plate. In general, it can be said that the guide plate is used to reduce interference or stray fields.
[0005] Die gewünschte homogene Verteilung des Magnetfeldes im Innenraum desThe desired homogeneous distribution of the magnetic field in the interior of the
Messrohres wird über entsprechend an den Durchmesser des Messrohres angepasste Polschuhe erreicht. Hierdurch sind die von dem magnetisch-induktiven Durchflussmessgerät gelieferten Messspannungen weitgehend unabhängig von dem Strömungsprofil des Mediums, das durch das Messrohr strömt.Measuring tube is achieved via appropriately adapted to the diameter of the measuring tube pole pieces. As a result, the measuring voltages supplied by the electromagnetic flowmeter are largely independent of the flow profile of the medium flowing through the measuring tube.
[0006] Bei der bekannten Magnetanordnung, bestehend aus Leitblech und Polschuh, besteht eine magnetische Kopplung zwischen Leitblech und Polschuh. Folglich verläuft ein Teil der Magnetfeldlinien, die an der dem Messrohr zugewandten Oberfläche des Polschuhs austreten, nicht - wie gewünscht - durch das Messrohr zum gegenüberliegenden Polschuh, sondern die Magnetfeldlinien schließen sich über den kürzeren Luftspalt zwischen Polschuh und Leitblech und werden so aus dem eigentlichen Mess-Magnetfeld ausgekoppelt. Darüber hinaus treten bei bekannten Magnetanordnungen, also Elektromagnete mit Polschuhen, Streufelder auf. Auch hierdurch wird der Wirkungsgrad eines magnetisch-induktiven Durchflussmessgeräts verringert. Unter Wirkungsgrad wird hierbei der Anteil der in das Messrohr eingekoppelten Magnetfeldlinien zu der Gesamtzahl der von der Magnetanordnung erzeugten Magnetfeldlinien verstanden.In the known magnet arrangement consisting of baffle and pole piece, there is a magnetic coupling between baffle and pole piece. Consequently, a part of the magnetic field lines which emerge at the surface of the pole piece facing the measuring tube does not pass through the measuring tube to the opposite pole shoe as desired, but the magnetic field lines close over the shorter air gap between pole piece and guide plate and thus become the actual measurement Magnetic field decoupled. In addition, stray fields occur in known magnet arrangements, that is to say electromagnets with pole shoes. This also reduces the efficiency of a magnetic-inductive flowmeter is reduced. In this case, efficiency is understood to mean the proportion of the magnetic field lines coupled into the measuring tube to the total number of magnetic field lines generated by the magnet arrangement.
[0007] Der Erfindung liegt die Aufgabe zugrunde, ein magnetisch-induktives Durchflussmessgerät mit einem erhöhten Wirkungsgrad vorzuschlagen.The invention has for its object to propose a magneto-inductive flowmeter with an increased efficiency.
[0008] Die Aufgabe wird dadurch gelöst, dass zumindest ein erstes Abschirmelement zwischen Polschuh und Leitblech derart angeordnet ist, dass im Bereich zwischen Polschuh und Leitblech der magnetische Widerstand erhöht wird. Hierdurch werden magnetische Streufelder im Außenraum des Messrohrs reduziert; gleichzeitig wird die Feldstärke des Mess-Magnetfeldes erhöht.The object is achieved in that at least a first shield between pole piece and baffle is arranged such that in the area between the pole piece and baffle of the magnetic resistance is increased. As a result, magnetic stray fields are reduced in the outer space of the measuring tube; at the same time the field strength of the measuring magnetic field is increased.
[0009] Bevorzugt handelt es sich bei der Magnetanordnung um zwei sich bezüglich des Messrohres diametral gegenüberliegende Elektromagnete, bestehend aus Spulenanordnungen und Polschuhen. Durch die Anordnung eines flächigen, der jeweiligen Geometrie des Messrohrs angepassten Form des ersten Abschirmelements in den Seitenbereichen jedes Elektromagneten zwischen Polschuh und Leitblech wird eine virtuelle Vergrößerung des Luftspalts zwischen Polschuh und Leitblech erreicht - oder mit anderen Worten, der magnetische Widerstand in diesen Bereichen wird erhöht. Als Folge des in diesen Bereichen erhöhten magnetischen Widerstands nehmen die Magnetfeldlinien in gesteigertem Maße den durch das Leitblech vorgegebenen Weg im Außenraum des Messrohrs und schließen sich, indem sie den direkten Weg durch das Messrohr nehmen. Generell lässt sich sagen, dass durch die erfindungsgemäße Anordnung von Abschirmblechen im Bereich zwischen Polschuhen und Leitblech oder auch im Außenbereich der Spulenanordnung die magnetischen Nebenschlüsse drastisch reduziert werden.Preferably, in the magnet assembly to two with respect to the measuring tube diametrically opposite electromagnets, consisting of coil assemblies and pole pieces. The arrangement of a flat, adapted to the respective geometry of the measuring tube shape of the first shielding in the side regions of each electromagnet between the pole piece and baffle virtual enlargement of the air gap between the pole piece and baffle is achieved - or in other words, the magnetic resistance in these areas elevated. As a result of the increased magnetic resistance in these regions, the magnetic field lines increase the path through the baffle in the outer space of the measuring tube and close by taking the direct path through the measuring tube. In general, it can be said that the magnetic shunts are drastically reduced by the inventive arrangement of shielding in the area between pole pieces and baffle or in the outer region of the coil assembly.
[0010] Gemäß einer vorteilhaften Ausgestaltung der erfindungsgemäßen Vorrichtung ist in radialer Richtung oberhalb eines jeden Magnetanordnung ein zweites Abschirmelement vorgesehen. Die zweiten Abschirmelemente sind außerhalb des Leitblechs angeordnet und dienen jeweils der Reduktion des Streufeldes der Magnetanordnung, da auch durch sie der magnetische Widerstand im Außenraum des Messrohrs erhöht wird. Wiederum werden hierdurch die Magnetfeldlinien bevorzugt auf den direkten Weg über den Innenraum des Messrohres gezwungen. Darüber hinaus werden durch diese Ausgestaltung magnetische Störfelder, die sich in der Umgebung des Durchflussmessgeräts befinden, effektiv abgeschirmt.According to an advantageous embodiment of the device according to the invention, a second shielding element is provided in the radial direction above each magnet arrangement. The second shielding elements are arranged outside the guide plate and each serve to reduce the stray field of the magnet arrangement, since the magnetic resistance in the outer space of the measuring tube is also increased by it. Again, the magnetic field lines are thereby preferably forced to the direct path over the interior of the measuring tube. In addition, this design effectively shields magnetic interference fields located in the vicinity of the flowmeter.
[0011] Gemäß einer vorteilhaften Ausgestaltung der erfindungsgemäßen Vorrichtung ist das Abschirmelement aus einem diamagnetischen Material gefertigt. Selbstverständlich ist es auch möglich, lediglich an dem Abschirmelement eine diamagnetische Beschichtung vorzusehen. Das Abschirmelement selbst weist eine durchgehende Fläche auf, oder es ist als Gitter ausgebildet. Bei dem diamagnetischen Material kann es sich beispielsweise um Wismut oder Graphit handeln. Darüber hinaus ist vorgesehen, dass das Abschirmelement aus einem supraleitenden Material gefertigt ist. Da ein supraleitendes Material einen gegen Unendlich gehenden magnetischen Widerstand aufweist, wird durch eine derartige Lösung ein sehr hoher Wirkungsgrad erreicht.According to an advantageous embodiment of the device according to the invention, the shielding element is made of a diamagnetic material. Of course, it is also possible to provide only on the shielding a diamagnetic coating. The shielding element itself has a continuous surface, or it is formed as a grid. The diamagnetic material may be, for example, bismuth or graphite. In addition, it is provided that the shielding element is made of a superconducting material. Since a superconducting material has a near-infinity magnetic resistance, such a solution achieves a very high efficiency.
[0012] Die Erfindung wird anhand der nachfolgenden Zeichnungen näher erläutert. Es zeigt:The invention will be explained in more detail with reference to the following drawings. It shows:
[0013] Fig. 1: eine schematische Darstellung einer Ausführungsform des erfindungsgemäßen magnetisch-induktiven Durchflussmessgeräts,1 is a schematic representation of an embodiment of the magnetic inductive flowmeter according to the invention,
[0014] Fig. 2: eine schematische Darstellung eines Ausschnitts eines bekannten magnetisch-induktiven Durchflussmessgeräts mit Skizzierung des Verlaufs der Magnetfeldlinien undFig. 2 is a schematic representation of a section of a known magnetic-inductive flowmeter with a sketch of the course of the magnetic field lines and
[0015] Fig. 3: eine schematische Darstellung eines Ausschnitts einer Ausführungsform des erfindungsgemäßen Durchflussmessgeräts mit Skizzierung des Verlaufs der Magnetfeldlinien.3 is a schematic representation of a section of an embodiment of the flowmeter according to the invention with a sketch of the course of the Magnetic field lines.
[0016] Fig. 1 zeigt eine schematische Darstellung einer ersten Ausgestaltung der erfindungsgemäßen Vorrichtung 1. Das Messrohr 2 wird von dem Medium 11 in Richtung der Messrohrachse 3 durchflössen. Das Medium 11 ist zumindest in geringem Umfang elektrisch leitfähig. Das Messrohr 2 selbst ist aus einem nicht- leitfähigen Material gefertigt, oder es ist zumindest an seiner Innenfläche mit einem nicht-leitfähigen Material ausgekleidet.Fig. 1 shows a schematic representation of a first embodiment of the device 1 according to the invention. The measuring tube 2 is flowed through by the medium 11 in the direction of the measuring tube axis 3. The medium 11 is at least to a small extent electrically conductive. The measuring tube 2 itself is made of a non-conductive material, or it is lined at least on its inner surface with a non-conductive material.
[0017] Das senkrecht zur Strömungsrichtung des Mediums 11 ausgerichtete Magnetfeld B wird über die diametral angeordnete Spulenanordnung 6, 7 bzw. über zwei Elektromagnete erzeugt. Unter dem Einfluß der Magnetfeldes B wandern in dem Medium 11 befindliche Ladungsträger je nach Polarität zu den beiden entgegengesetzt gepolten Messelektroden 4, 5 ab. Die sich an den Messelektroden 4, 5 aufbauende Messspannung ist proportional zu der über den Querschnitt des Messrohres 2 gemittelten Strömungsgeschwindigkeit des Mediums 11, d. h. sie ist ein Maß für den Volumenstrom des Mediums 11 in dem Messrohr 2. Das Messrohr 2 ist übrigens über Verbindungselemente, z. B. Flansche, die in der Zeichnung nicht gesondert dargestellt sind, mit einem Rohrsystem, durch das das Medium 11 hindurchströmt, verbunden.The perpendicular to the flow direction of the medium 11 aligned magnetic field B is generated via the diametrically arranged coil assembly 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 measuring tube 2 is incidentally via connecting elements, for. As flanges, which are not shown separately in the drawing, connected to a pipe system through which the medium 11 passes.
[0018] In den beiden gezeigten Fällen befinden sich die Messelektroden 4, 5 in direktem Kontakt mit dem Medium 11; die Kopplung kann jedoch, wie bereits an vorhergehender Stelle erwähnt, auch kapazitiv erfolgen.In the two cases shown, the measuring electrodes 4, 5 are in direct contact with the medium 11; However, as already mentioned above, the coupling can also be capacitive.
[0019] Über Verbindungsleitungen 12, 13 sind die Messelektroden 4, 5 mit der Rege-[0019] Via connecting lines 12, 13 the measuring electrodes 4, 5 are connected to the
/Aus werteeinheit 8 verbunden. Die Verbindung zwischen den Spulenanordnungen 6, 7 und der Regel-/Aus werteeinheit 8 erfolgt über die Verbindungsleitungen 14, 15. Die Regel-/Aus werteeinheit 8 ist über die Verbindungsleitung 16 mit einer Eingabe- /Ausgabeeinheit 9 verbunden. Der Auswerte-/Regeleinheit 8 ist die Speichereinheit 10 zugeordnet./ Value unit 8 connected. The connection between the coil arrangements 6, 7 and the control / evaluation unit 8 takes place via the connection lines 14, 15. The control / evaluation unit 8 is connected via the connection line 16 to an input / output unit 9. The evaluation / control unit 8 is associated with the memory unit 10.
[0020] In Fig. 2 ist eine schematische Darstellung eines Ausschnitts eines bekannten magnetisch-induktiven Durchflussmessgeräts 1 mit Skizzierung des Verlaufs der Magnetfeldlinien gezeigt. Fig. 3 zeigt die analoge Darstellung bei einer bevorzugten Ausgestaltung des erfindungsgemäßen Durchflussmessgeräts 1.In Fig. 2 is a schematic representation of a section of a known magnetic-inductive flow meter 1 is shown with a sketch of the course of the magnetic field lines. 3 shows the analog representation in a preferred embodiment of the flowmeter 1 according to the invention.
[0021] Das Magnetfeld B wird in beiden Fällen über die beiden sich diametral gegenüberliegenden Magnetanordnungen 6, 7 erzeugt. Eine Magnetanordnung 6; 7 besteht im gezeigten Fall aus einem Elektromagneten und einem Polschuh 17, 18, der hinsichtlich seiner Form an das Messrohr 2 angepasst ist. Insbesondere sind die Polschuhe 17, 18 so geformt, dass das Magnetfeld B, das das von dem Medium 11 durchströmte Messrohr 2 durchsetzt, möglichst homogen ist. Das Magnetfeld B ist in beiden Zeichnungen Fig. 2 und Fig. 3 nur ausschnittsweise skizziert.The magnetic field B is generated in both cases via the two diametrically opposite magnet arrangements 6, 7. A magnet assembly 6; 7 consists in the case shown of an electromagnet and a pole piece 17, 18, which is adapted to the measuring tube 2 in terms of its shape. In particular, the pole shoes 17, 18 are shaped so that the magnetic field B, that of the medium 11th flowed through measuring tube 2 interspersed, is as homogeneous as possible. The magnetic field B is only partially sketched in both drawings Fig. 2 and Fig. 3.
[0022] Wie aus Fig. 2 ersichtlich, erfolgt bei der bislang bekannten Lösungen mitAs seen from Fig. 2, takes place in the previously known solutions
Leitblech 21 jeweils eine relativ starke Rückkopplung der Magnetfeldlinien im Bereich zwischen Polschuh 17; 18 und den entsprechenden angrenzenden Bereichen des Leitblechs 21. Insbesondere verlaufen daher die an der jeweiligen Unterseite deines Polschuhs 17; 18 austretenden Magnetfeldlinien nicht nur über das Medium 11 zum gegenüberliegenden Polschuh 18; 17, sondern ein Teil der Magnetfeldlinien schließt sich über den Luftspalt zwischen dem Polschuh 17, 18 und Leitblech 21, wodurch ein beachtlicher Teil der Magnetfeldlinien nicht - wie gewünscht - den Weg durch das Messrohr 2 nimmt. Der magnetische Wirkungsgrad ist daher bei den bekannten magnetisch-induktiven Durchflussmessgeräten relativ gering.Guide plate 21 each have a relatively strong feedback of the magnetic field lines in the area between pole piece 17; 18 and the corresponding adjacent areas of the baffle 21. In particular, therefore, the run at the respective bottom of your pole piece 17; 18 leaking magnetic field lines not only on the medium 11 to the opposite pole piece 18; 17, but a part of the magnetic field lines closes over the air gap between the pole piece 17, 18 and baffle 21, whereby a considerable part of the magnetic field lines does not - as desired - the way through the measuring tube 2 takes. The magnetic efficiency is therefore relatively low in the known magnetic-inductive flowmeters.
[0023] Fig. 3 zeigt eine schematische Darstellung eines Ausschnitts einer bevorzugtenFig. 3 shows a schematic representation of a section of a preferred
Ausführungsform des erfindungsgemäßen Durchflussmessgeräts 1 mit Skizzierung des Verlaufs der Magnetfeldlinien. Bei dieser Ausgestaltung sind sowohl erste Abschirmelemente 19a, 19b, 19c, 19d als auch zweite Abschirmelemente 20a, 20b vorgesehen. Es versteht sich von selbst, dass in gewissen Anwendungsfällen auch nur die ersten Abschirmelemente 19a, 19b, 19c, 19d oder nur die zweiten Abschirmelemente 20a, 20b ausreichend sind. Erfindungsgemäß sind jeweils in den seitlichen Bereichen der beiden Elektromagnete 6, 7 zwischen den Polschuhen 17, 18 und dem Leitblech 21 diamagnetische Bleche bzw. Abschirmelemente 19a, 19b, 19c, 19d angebracht. Diese haben eine Form, die der jeweiligen Form des Messrohres 2 angepasst ist. Im gezeigten Fall sind es abgewinkelte Bleche aus Wismut oder Graphit. Möglich ist es auch, ein Abschirmelement 19a, 19b, 19c, 19d ; 20a, 20b mit einer diamagnetischen Beschichtung zu versehen. Wie bereits erwähnt, sind Abschirmelemente 19a, 19b, 19c, 19d ; 20a, 20b aus supraleitendem Material hinsichtlich ihrer Eigenschaft, magnetische Feldlinien gänzlich zu blockieren, für die erfindungsgemäße Lösung ideal.Embodiment of the flowmeter 1 according to the invention with a sketch of the course of the magnetic field lines. In this embodiment, both first shielding elements 19a, 19b, 19c, 19d and second shielding elements 20a, 20b are provided. It goes without saying that in certain applications, only the first shielding elements 19a, 19b, 19c, 19d or only the second shielding elements 20a, 20b are sufficient. According to the invention, diamagnetic sheets or shielding elements 19a, 19b, 19c, 19d are respectively mounted in the lateral regions of the two electromagnets 6, 7 between the pole shoes 17, 18 and the baffle 21. These have a shape that is adapted to the particular shape of the measuring tube 2. In the case shown, they are angled sheets of bismuth or graphite. It is also possible, a shield 19a, 19b, 19c, 19d; 20a, 20b to be provided with a diamagnetic coating. As already mentioned, shielding elements 19a, 19b, 19c, 19d; 20a, 20b of superconducting material in terms of their ability to block magnetic field lines entirely, ideal for the inventive solution.
[0024] Beispielsweise sind die Abschirmelemente 19a, 19b, 19c, 19d über in der Fig. 3 nicht gesondert dargestellte Schraub Verbindungen an dem Leitblech 21 oder an den Polschuhen 17, 18 befestigt. Ein zweites Abschirmelement 20a, 20b ist jeweils in radialer Richtung gesehen jeweils hinter einer Magnetanordnung 6, 7 angeordnet.For example, the shielding 19a, 19b, 19c, 19d via not shown in Fig. 3 screw connections to the baffle 21 or to the pole pieces 17, 18 are attached. A second shielding element 20a, 20b is in each case arranged behind a magnet arrangement 6, 7, viewed in the radial direction.
[0025] Der magnetische Widerstand wird durch die Anordnung der diamagnetischenThe magnetic resistance is determined by the arrangement of the diamagnetic
Abschirmelemente 19a, 19b, 19c, 19d; 20a, 20b in den entsprechenden Raumbereichen erheblich erhöht. Hierdurch werden die Magnetfeldlinien quasi auf den für die Mess- Performance optimalen Weg durch das Messrohr 2 umgeleitet. Hierdurch wird der magnetische Wirkungsgrad erhöht. Durch die erfindungsgemäße Anordnung der Abschirmelemente 19a, 19b, 19c, 19d; 20a, 20b und den hierdurch erreichten besseren Wirkungsgrad lassen sich kostengünstigere Komponenten zur Erzeugung des Magnetfeldes verwenden. Somit lässt sich ein erfindungsgemäßes magnetischinduktives Durchflussmessgerät relativ zu einem vergleichbaren herkömmlichen Durchflussmessgerät mit reduzierten Herstellungskosten fertigen. [0026] BezugszeichenlisteShielding elements 19a, 19b, 19c, 19d; 20a, 20b considerably increased in the corresponding room areas. As a result, the magnetic field lines become more or less the same for the measuring Performance optimal way redirected through the measuring tube 2. As a result, the magnetic efficiency is increased. The inventive arrangement of the shielding 19a, 19b, 19c, 19d; 20a, 20b and thus achieved better efficiency can be used cost-effective components for generating the magnetic field. Thus, a magnetic inductive flow meter according to the invention can be manufactured relative to a comparable conventional flow meter with reduced production costs. [0026] List of Reference Numerals
1. Magnetisch-induktives Durchflussmessgerät1. Magnetic-inductive flowmeter
2. Messrohr2nd measuring tube
3. Messrohrachse3. Measuring tube axis
4. Messelektrode4. measuring electrode
5. Messelektrode5. Measuring electrode
6. Spulenanordnung / Elektromagnet6. coil arrangement / electromagnet
7. Spulenanordnung / Elektromagnet7. Coil arrangement / electromagnet
8. Regel-/Aus werteeinheit8. Control / evaluation unit
9. Eingabe-ZAusgabeeinheit9. input-output unit
10. Speichereinheit10. Storage unit
11. Meßmedium11. Measuring medium
12. Verbindungsleitung12. Connecting line
13. Verbindungsleitung13. Connecting line
14. Verbindungsleitung14. Connection line
15. Verbindungsleitung15. Connecting line
16. Verbindungsleitung16. Connecting line
17. Polschuh17. Pole shoe
18. Polschuh18. Pole shoe
19. Erstes Abschirmelement19. First shielding element
20. Zweites Abschirmelement20. Second shielding element
21. Leitblech 21 baffle

Claims

Ansprüche claims
[0001] 1. Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums1. Device for measuring the volume or mass flow of a medium
(11), das ein Messrohr (2) in Richtung der Messrohrachse (3) durchströmt, mit einer Magnetanordnung (6, 7) mit Polschuhen (17, 18), die so geformt und angeordnet sind, dass im Messrohr (2) ein homogenes Mess-Magnetfeld mit im wesentlichen quer zur Messrohrachse (3) verlaufenden Magnetfeldlinien erzeugt wird, und mit einem im Außenbereich des Messrohres (2) ange-ordneten Leitblech (21) zur Führung des Magnetfeldes (B) im Außenraum des Messrohres (2), mit zumindest einer mit dem Medium (11) gekoppelten Mess-elektrode (4, 5), die in einem Seitenbereich des Messohres (2) angeordnet ist, und mit einer Regel-/Auswerteeinheit (8), die anhand der in die zumindest eine Messelektrode (4, 5) induzierten Mess Spannung Information über den Volumen- oder Massestrom des Mediums (11) in dem Messrohr (2) liefert, dadurch gekennzeichnet, dass zumindest ein erstes Abschirmelement (19a, 19b, 19,c, 19d) zwischen einem Polschuh (17, 18) und dem Leitblech (21) so angeordnet ist, dass im Bereich zwischen Polschuh (17, 18) und Leitblech (21) der magnetische Widerstand erhöht wird, wodurch magnetische Streufelder im Außenraum des Messrohrs (2) reduziert werden und die Feldstärke des Mess- Magnetfeldes (B) erhöht wird.(11), which flows through a measuring tube (2) in the direction of the measuring tube axis (3), with a magnet arrangement (6, 7) with pole shoes (17, 18), which are shaped and arranged such that in the measuring tube (2) a homogeneous Measuring magnetic field is generated with substantially transverse to the Meßrohrachse (3) extending magnetic field lines, and with a in the outer region of the measuring tube (2) arranged baffle (21) for guiding the magnetic field (B) in the outer space of the measuring tube (2), with at least one measuring electrode (4, 5) coupled to the medium (11), which is arranged in a side region of the measuring tube (2), and with a control / evaluation unit (8), which, on the basis of the at least one measuring electrode (FIG. 4, 5) induces measurement information about the volumetric or mass flow of the medium (11) in the measuring tube (2), characterized in that at least one first shielding element (19a, 19b, 19, c, 19d) is connected between a pole piece ( 17, 18) and the guide plate (21) is arranged so that in the area between Pole shoe (17, 18) and baffle (21) of the magnetic resistance is increased, whereby stray magnetic fields in the outer space of the measuring tube (2) can be reduced and the field strength of the measuring magnetic field (B) is increased.
[0002] 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die2. Apparatus according to claim 1, characterized in that the
Magnetanordnung jeweils einen Elektromagneten aufweist.Magnet arrangement each having an electromagnet.
[0003] 3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass jeweils ein zweites Abschirmelement (20a, 20b) in radialer Richtung oberhalb der Magnetanordnung (6, 7) bzw. oberhalb des Elektromagneten angeordnet ist.3. Device according to claim 1, characterized in that in each case a second shielding element (20a, 20b) is arranged in the radial direction above the magnet arrangement (6, 7) or above the electromagnet.
[0004] 4. Vorrichtung nach Anspruch 1 oder 3, dadurch gekennzeichnet, wobei das erste Abschirmelement (19a, 19b, 19,c, 19d) und das zweite Abschirmelement (20a, 20b) aus einem diamagnetischen Material gefertigt sind.4. Apparatus according to claim 1 or 3, characterized in that the first shielding member (19a, 19b, 19, c, 19d) and the second shielding member (20a, 20b) are made of a diamagnetic material.
[0005] 5. Vorrichtung nach Anspruch 1 oder 3, dadurch gekennzeichnet, wobei das erste Abschirmelement (19a, 19b, 19,c, 19d) und das zweite Abschirmelement (20a, 20b) eine diamagnetische Beschichtung tragen.5. Device according to claim 1 or 3, characterized in that the first shielding element (19a, 19b, 19, c, 19d) and the second shielding element (20a, 20b) carry a diamagnetic coating.
[0006] 6. Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass das6. Apparatus according to claim 4 or 5, characterized in that the
Abschirmelement (19a, 19b, 19,c, 19d; 20a, 20b) eine im wesentlichen ebene Fläche aufweist oder als Gitter ausgebildet ist.Shielding element (19a, 19b, 19, c, 19d, 20a, 20b) has a substantially flat surface or is formed as a grid.
[0007] 7. Vorrichtung nach 1, dadurch gekennzeichnet, dass das erste Abschirmelement (19a, 19b, 19,c, 19d) und/oder das zweite Abschirmelement (20a, 20b) aus einem supraleitenden Material gefertigt ist/sind. 7. The device according to 1, characterized in that the first Shielding element (19a, 19b, 19, c, 19d) and / or the second shielding member (20a, 20b) is made of a superconducting material / are.
PCT/EP2007/052210 2006-03-28 2007-03-09 Magnetoinductive flowmeter WO2007110310A1 (en)

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DE200610014677 DE102006014677A1 (en) 2006-03-28 2006-03-28 Magneto inductive flow meter for measuring volume flow or mass flow of medium, has screening units between pole shoes and guide plate to reduce magnetic stray fields in outer space of tube and to increase field strength of magnetic field

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