WO2016041723A1 - Débitmètre à induction magnétique pourvu d'un système magnétique à quatre bobines - Google Patents

Débitmètre à induction magnétique pourvu d'un système magnétique à quatre bobines Download PDF

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Publication number
WO2016041723A1
WO2016041723A1 PCT/EP2015/069050 EP2015069050W WO2016041723A1 WO 2016041723 A1 WO2016041723 A1 WO 2016041723A1 EP 2015069050 W EP2015069050 W EP 2015069050W WO 2016041723 A1 WO2016041723 A1 WO 2016041723A1
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WO
WIPO (PCT)
Prior art keywords
measuring
pairs
coil
induced voltage
measuring electrode
Prior art date
Application number
PCT/EP2015/069050
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German (de)
English (en)
Inventor
Simon Stingelin
Andreas Berger
Original Assignee
Endress+Hauser Flowtec Ag
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Filing date
Publication date
Application filed by Endress+Hauser Flowtec Ag filed Critical Endress+Hauser Flowtec Ag
Publication of WO2016041723A1 publication Critical patent/WO2016041723A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—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 a device for measuring the flow of a flowing fluid through a measuring tube according to the magnetic-inductive measuring principle.
  • Magnetic-inductive flowmeters are widely used in process and automation technology for fluids from an electrical conductivity of about ⁇ / ⁇ .
  • the measuring principle is based on Faraday see 'law of magnetic induction and is known from various publications. By means of a fixed to a measuring section
  • Magnetic system is generated substantially perpendicular to the flow direction of the conductive fluid, a magnetic field of constant time strength. As a result, the ions present in the flowing fluid are deflected in opposite directions. The through this
  • Charge separation resulting electrical voltage is tapped by means of at least one also fixed in the measuring section pair of measuring electrodes.
  • the tapped voltage is proportional to the flow velocity of the fluid and thus proportional to
  • the measuring accuracy of a magnetic-inductive flowmeter depends on many different factors. Some of these relate to the design itself, such as the positioning accuracy of the magnet system, or the reading of the measurement signal via the at least one measuring electrode pair and its geometry. Furthermore, the
  • the prevailing flow profile in turn depends on the Reynolds number, which depends on the flow velocity, the geometry of the measuring tube and its surface roughness in the inner region, physical and / or chemical material parameters of the fluid, such as the viscosity, and the inlet conditions of the flowing fluid in the measuring tube in front of the measuring section, the so-called inlet section, in which the measuring device is mounted.
  • the flow rate of the fluid is determined from the cross-sectional area of the measuring tube.
  • a laminar flow profile is typically present with a sufficiently long straight inlet section of the measuring tube, which is followed by the measuring section.
  • the flow profile is also determined by the course of the pipes and the course and the length of the inlet section.
  • a manifold inside the pipeline significantly affects the flow profile. If a flow device is arranged more or less directly after a manifold, then a significant deterioration of the measurement accuracy must be expected. It goes without saying that an elbow is only one example of such a disturbance of the airfoil, and that the considerations also apply to other pipe-related disturbances. Compared to the dependence of the flow profile on the Reynolds number, the influence of the pipes can be determined by the suitable arrangement of the
  • the measuring tube is designed so that it has sections of different cross-sectional areas.
  • a smaller cross-sectional area in particular with a rectangular measuring tube profile, is selected for the measuring section than for the other two sections.
  • Cross-sectional area reduction offers the advantage that the flow rate of the fluid in this area is higher.
  • the prevailing flow profile is conditioned, which leads to an improvement in the measurement performance over a large range of the flow rate.
  • the originally uniformly configured measuring tube in the region of the measuring section must be changed by external force. Therefore, alternative methods for conditioning the airfoil are within the measurement section
  • the present invention has for its object to provide a device and a method for measuring the flow according to the magnetic-inductive measuring principle, with which or with which regardless of the inlet conditions of the flowing fluid in the measuring section, a high accuracy can be achieved.
  • This object is achieved by a device for measuring the
  • At least two magnet systems attached to the measuring tube each for generating a magnetic field substantially perpendicular to the flow direction, each having a pair of coils having a first and a second coil, which coils are mounted on opposite sides along a diametrical connecting line on the measuring tube
  • At least two measuring electrode pairs each for tapping an induced voltage, each having a first and second measuring electrode, which
  • Measuring electrodes each on opposite sides along a diametrical
  • Connecting line are attached to the measuring tube such that the first of the at least two measuring electrode pairs is oriented perpendicular to the first of the at least two coil pairs and the second of the at least two measuring electrode pair perpendicular to the second of the at least two coil pairs
  • an electronic unit for signal detection, and / or evaluation, and for controlling the magnet systems which electronic unit is designed such that it drives a first of the at least two coil pairs in a first time interval and taps off a first induced voltage across the first of the at least two measuring electrode pair, in that it activates a second of the at least two coil pairs in a second time interval and taps off a second induced voltage via a second of the at least two pairs of measuring electrodes, and averages the at least two values for the induced voltage and determines the flow therefrom.
  • Electrode pairs as well as the averaging over the at least two measurement signals is the measurement error ⁇ , the deviation of a measured value from the true value of the respective
  • the measurement deviation ⁇ depends on the angle ⁇ between the axis through the two measuring electrodes and the axis parallel to the pipeline upstream of the manifold. If at least two separate magnetic systems arranged at a specific angle to one another are used to measure the flow rate, then so the measured values generated in each case are subject to a different measurement deviation. By judicious choice of the respective orientations, the determination of the flow can then be made more accurately by averaging the two measurements. In particular, you can
  • the angle between at least two of the at least two connecting lines is in each case one of the at least two
  • the angle between at least two of the at least two connecting lines is set so that the measurement deviation as a function of the angle ⁇ - ⁇ between the longitudinal axis of the pipeline before the bend and the connecting line through the first of the at least two pairs of measuring electrodes and the measurement deviation Function of the angle a 2 between the
  • Pipe axis in front of the manifold and the connecting line through the second of the at least two pairs of measuring electrodes substantially compensate each other.
  • the dependence of the measurement deviation as a function of the angle ⁇ , ⁇ ( ⁇ ) is a periodic function of the angle. Depending on the angle, for example, there is either a positive error, which means that the reading is greater than the true value, or a negative one
  • Measurement deviation at which the measured value is correspondingly smaller than the true value for the flow Assigning the two magnet systems now so that ⁇ ( ⁇ - ⁇ )> 0 and ⁇ ( ⁇ 2 ) ⁇ 0 and then averages over the two results, can for the flow of a more accurate
  • Measurement can be achieved. Ideally, the two magnetic fields are aligned so that the measurement deviations ⁇ ( ⁇ - ⁇ ) and ⁇ ( ⁇ 2 ) compensate substantially exactly.
  • the angle between at least two of the at least two connecting lines through each one of the at least two measuring electrode pairs is 90 °.
  • various embodiments are conceivable. Some advantageous examples are mentioned in the subclaims.
  • a square arrangement of at least one field plate for field feedback is provided for each of the at least two magnetic systems.
  • this waiver is not mandatory, but only one of several possibilities
  • Embodiment represents, and that other suitable embodiments of the magnet systems fall under the invention. It is advantageous if a cuboid housing is provided for the at least two magnet systems.
  • the housing is bevelled at the edges.
  • a tapered housing optionally also arranged together with the coils return plates must be chamfered.
  • the magnetic field generated by the respective one of the at least two coil pairs is substantially homogeneous.
  • the magnetic field generated by the respective one of the at least two coil pairs is greater in the region of the measuring electrode pairs than in the central region of the measuring tube.
  • Such a constructed magnetic field increases the measuring performance of the
  • a reference potential for the at least two measuring electrode pairs is given by the measuring tube or a process connection. It would also be conceivable, the reference potential in each case via one of the measuring electrodes of the respective
  • Time interval not active measuring electrode pair tap is not active measuring electrode pair tap.
  • this disadvantageously leads to delays and disturbances during the switching between the at least two magnet systems.
  • a grounding ring is provided, via which grounding ring the reference potential is predetermined, and which is integrated in a process connection.
  • the two magnet systems are arranged in the same space around the measuring tube. So they have the same distance to the cause of the disturbance of the airfoil, so for example the same distance to a manifold on. Accordingly, the two measurements are based on the same flow profile.
  • the object according to the invention is furthermore achieved by a method for measuring the flow of a flowing fluid through a pipeline according to the magnetic-inductive measuring principle, wherein at least two magnetic fields are generated substantially perpendicular to the flow direction in a measuring tube such that the two magnetic fields are at a fixed angle to one another wherein one induced for each of the at least two magnetic fields
  • Voltage is tapped, wherein in a first time interval, a first magnetic field is generated and a first induced voltage is tapped, wherein in a second time interval, a second magnetic field is generated and a second induced voltage is tapped, and that the at least two values for the induced voltage be averaged and from it the
  • Fig. 1 shows a magnetic-inductive flowmeter according to the prior art
  • FIG. 1 shows a magnetic-inductive flow meter 1 for measuring the flow of a flowing fluid 2 through a measuring tube 3.
  • the measuring tube 3 is in the fluid-facing region, d. H. on the inside over the entire length, provided with an electrically insulating liner 4. It is expedient, the measuring tube 3 in an inlet section 3 a, a measuring section 3 b, on which the sensor unit is mounted, and a
  • the magnet system 9,9 ' comprises at least two coils 9,9 'for generating the magnetic field 10 and possibly also pole pieces for realizing an advantageous spatial distribution and / or field plates.
  • the sensor unit with their respective components such. B, the measuring electrode pair 8 and the magnet system 9,9 ' is usually at least partially surrounded by a housing 5.
  • a housing 5 In the housing 5 or in the present case outside the housing 5 is still a
  • Electronic unit 6 is provided which is electrically connected via a connecting cable 7 to the field device 1.
  • the electronics unit is used for signal acquisition and / or evaluation and the supply of the coils, as well as an interface to the environment, eg. B. the measured value output or setting the device.
  • the measurement accuracy of the flowmeter 1 depends on the inlet conditions of the flowing fluid in the inlet section 3a. For example, a manifold 12 [s. Fig. 2] in the pipeline for a disturbance of the flow profile and reduces the accuracy of measurement. This dependency can be recorded qualitatively and quantitatively. For this purpose, in Fig. 2 the
  • Fig. 2a is a sketch of a section of a pipe 1 1 is shown with a manifold 12 and a arranged downstream of the manifold 12 flow meter 1 according to the prior art, wherein the angle ⁇ is drawn.
  • Magnetic system 9, 9 ', 9a, 9a' with the respective pair of measuring electrodes 8,8a produced measured values with a different measurement error.
  • the increase in the measurement deviation caused by the manifold 12 is compensated.
  • such a compensation can be achieved by arranging the at least two magnet systems 9, 9 ', 9a, 9a' or pairs of electrodes 8, 8a perpendicular to one another.
  • a device according to the invention in two-dimensional view is shown, with two magnet systems 9, 9 ', 9a, 9a' and two measuring electrode pairs 8,8a shown, which are aligned perpendicular to each other.
  • a first magnetic field (Bi) 10 is generated in a first time interval by means of the first magnet system 9, 9 ', and the induced voltage is tapped off from the first measuring electrode pair 8.
  • a second magnetic field (B 2 ) 10a perpendicular to (Bi) 10 is then generated by means of the second magnet system 9a, 9a ', and the induced voltage corresponding to the second
  • Measuring electrode pair 8a tapped. Subsequently, the two measured values are averaged and the flow determined.
  • the two magnet systems 9, 9 ', 9a, 9a' are arranged in the same spatial area around the measuring tube 3. In other cases, however, a spatial offset of the individual magnet systems 9, 9 ', 9a, 9a', or for some of the magnet systems 9, 9 ', 9a, 9a' may also be advantageous.
  • FIG. 3d shows a possibility for picking up a reference potential for the at least two measuring electrode pairs 8, 8a.

Abstract

L'invention concerne un dispositif, destiné à mesurer du débit d'un fluide s'écoulant dans une canalisation (11) selon le principe de mesure par induction magnétique, qui comprend un tube de mesure (3), au moins deux systèmes magnétiques (9, 9', 9a, 9a') fixés au tube de mesure (3), et destinés chacun à générer un champ magnétique (10, 10a) sensiblement perpendiculairement au sens d'écoulement et comportant chacun une paire de bobines (9, 9', 9a, 9a') constituée d'une première bobine (9, 9a) et d'une seconde bobine (9', 9a'), lesquelles bobines (9, 9', 9a, 9a') sont fixées au tube de mesure (3) sur des côtés opposés le long d'une ligne de liaison diamétrale, et lesquels au moins deux systèmes magnétiques (9, 9', 9a, 9a') sont disposés en formant entre eux un angle fixe par référence aux lignes de liaison passant par chacune des deux paires de bobines (9, 9', 9a, 9a'), au moins deux paires d'électrodes de mesure (8, 8a) destinées chacune à capter une tension induite au moyen de chacune des première et seconde électrodes de mesure, lesquelles électrodes de mesure (8, 8a) sont chacune fixées au tube de mesure (3) sur des côtés opposés le long d'une ligne de liaison diamétrale de telle sorte que la première (8) des au moins deux paires d'électrode de mesure (8, 8a) est orientée perpendiculairement à la première (9, 9') des au moins deux paires de bobines (9, 9', 9a , 9a') et la seconde (8a) des au moins deux paires d'électrodes de mesure (8, 8a) est orientée perpendiculairement à la seconde (9a, 9a') des au moins deux paires de bobines (9, 9', 9a, 9a'), et une unité électronique (6) destiné acquérir et/ou évaluer le signal et à commander les systèmes magnétiques (9, 9', 9a, 9a'), laquelle unité électronique (6) est conçue de façon à commander dans un premier intervalle de temps une première (9, 9') des au moins deux paires de bobines (9, 9', 9a, 9a') et capter une première tension induite aux bornes de la première (8) des au moins deux paires d'électrodes de mesure (8, 8a), commander dans un second intervalle de temps une seconde (9a, 9a') des au moins deux paires de bobines (9, 9', 9a, 9a') et capter une seconde tension induite aux bornes d'une seconde (8a) des au moins deux paires d'électrodes de mesure (8, 8a), et faire la moyenne des au moins deux valeurs de la tension induite et déterminer à partir de là le débit.
PCT/EP2015/069050 2014-09-17 2015-08-19 Débitmètre à induction magnétique pourvu d'un système magnétique à quatre bobines WO2016041723A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014113404.4A DE102014113404A1 (de) 2014-09-17 2014-09-17 Magnetisch-induktives Durchflussmessgerät mit einem Vierspulen- Magnetsystem
DE102014113404.4 2014-09-17

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WO2016041723A1 true WO2016041723A1 (fr) 2016-03-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109115286A (zh) * 2018-08-03 2019-01-01 燕山大学 双组励磁线圈多电极电磁相关法流量计传感器
WO2021087704A1 (fr) * 2019-11-04 2021-05-14 深圳市大疆创新科技有限公司 Débitmètre électromagnétique, procédé de commande, système de pulvérisation et véhicule aérien sans pilote agricole

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
DE102016112742A1 (de) * 2016-07-12 2018-01-18 Endress+Hauser Flowtec Ag Verfahren zum Messen der Durchflussgeschwindigkeit oder des Volumendurchflusses eines Mediums mittels eines magnetisch-induktiven Durchflussmessgeräts und ein magnetisch-induktives Durchflussmessgerät
DE102018132600B4 (de) * 2018-12-18 2024-02-22 Endress+Hauser Flowtec Ag Magnetisch-induktive Durchflussmesssonde und Messstelle zur Ermittlung eines Durchflusses und/oder eines Einbauwinkels
JP2024002967A (ja) * 2022-06-23 2024-01-11 クローネ アクチェンゲゼルシャフト 磁気誘導式流量測定装置

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US20140083199A1 (en) * 2012-09-26 2014-03-27 Rosemount Inc. Magnetic flowmeter with multiple coils

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GB2292613A (en) * 1994-08-01 1996-02-28 Edward Hall Higham Multiple electrode electromagnetic flowmeters
GB201006409D0 (en) * 2010-04-17 2010-06-02 Univ Huddersfield Means and method for mearsuring the flow rate of fluid
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Publication number Priority date Publication date Assignee Title
US3490282A (en) * 1966-07-28 1970-01-20 Tokyo Shibaura Electric Co Induction liquid flowmeters
EP0233084A2 (fr) * 1986-02-14 1987-08-19 Aichi Tokei Denki Co., Ltd. Débitmètre électromagnétique
EP0770857A2 (fr) * 1995-10-26 1997-05-02 Kabushiki Kaisha Toshiba Débitmètre électromagnétique
EP1591759A1 (fr) * 2004-04-08 2005-11-02 Yokogawa Electric Corporation Débitmètre électromagnétique
US20140083199A1 (en) * 2012-09-26 2014-03-27 Rosemount Inc. Magnetic flowmeter with multiple coils
DE202012104036U1 (de) * 2012-10-19 2014-01-20 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109115286A (zh) * 2018-08-03 2019-01-01 燕山大学 双组励磁线圈多电极电磁相关法流量计传感器
WO2021087704A1 (fr) * 2019-11-04 2021-05-14 深圳市大疆创新科技有限公司 Débitmètre électromagnétique, procédé de commande, système de pulvérisation et véhicule aérien sans pilote agricole

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