EP1743141A1 - Dispositif pour mesurer le debit d'un milieu de mesure - Google Patents

Dispositif pour mesurer le debit d'un milieu de mesure

Info

Publication number
EP1743141A1
EP1743141A1 EP05749155A EP05749155A EP1743141A1 EP 1743141 A1 EP1743141 A1 EP 1743141A1 EP 05749155 A EP05749155 A EP 05749155A EP 05749155 A EP05749155 A EP 05749155A EP 1743141 A1 EP1743141 A1 EP 1743141A1
Authority
EP
European Patent Office
Prior art keywords
measuring
magnetic field
flow
measuring tube
medium
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Withdrawn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
EP05749155A
Other languages
German (de)
English (en)
Inventor
Thomas Bier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP1743141A1 publication Critical patent/EP1743141A1/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Withdrawn legal-status Critical Current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
    • 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 flow of a measuring medium which flows through a measuring tube in the direction of the longitudinal axis of the measuring tube.
  • Magnetic-inductive flowmeters use the principle of electrodynamic induction for volumetric flow measurement: Charge carriers of the medium which are moved perpendicular to a magnetic field induce a voltage in measuring electrodes arranged essentially perpendicular to the direction of flow of the measuring medium and perpendicular to the magnetic field.
  • the measuring electrodes are either galvanically or capacitively coupled to the medium. This voltage induced in the measuring electrodes is proportional to the flow velocity of the medium averaged over the cross section of the tube; it is therefore proportional to the volume flow.
  • Flowmeters of this type are usually integrated in a process plant.
  • the flow of a measuring medium through a process plant often does not occur naturally, e.g. due to a slope, but it is generated by a pump.
  • Pumps are usually driven by an electric motor.
  • the rotor of an electric motor also rotates in a time-varying magnetic field. The device according to the invention makes use of this fact.
  • the invention has for its object to propose an inexpensive device for the combined operation of a magnetic-inductive flow measuring arrangement and an electric motor.
  • the object is achieved by means of a magnet arrangement which generates an alternating magnetic field at two locations, the magnetic field at the first location passing through the measuring tube transversely to the longitudinal axis of the measuring tube, the measuring tube being assigned at least one measuring electrode into which one of the flow rate of the Measuring medium-dependent measuring current is induced, the magnetic field at the second location being designed in such a way that it drives an electric motor, with at least one measuring device (7) which detects at least one variable for controlling the magnet arrangement (2) which is necessary for operating the electric motor ( 10) and the flow measuring arrangement (11) is required, and the control evaluation unit supplies information about the volume flow of the measuring medium in the measuring tube based on the measuring voltage induced in the measuring electrode.
  • a common device is thus provided for the provision of two magnetic fields at at least two different locations used to generate magnetic fields.
  • the magnet arrangement is two symmetrically arranged, elongated, magnetic cores, to which at least one current coil is assigned.
  • Each magnetic core preferably has two pole pieces, of which one pole piece is assigned to the electric motor and one pole piece is assigned to the flow measuring arrangement.
  • the electric motor is a drive for operating a pump. It is considered particularly favorable if the pump is a drain pump in a washing machine or a flow pump in a heating or cooling system.
  • a shaded-pole motor is used in connection with the device according to the invention as an electric motor.
  • An advantageous embodiment of the device according to the invention provides a magnetic field sensor which detects the magnetic field in the immediate vicinity of the flow measuring arrangement during a measurement phase; The measured values supplied by the magnetic field sensor are taken into account by the control / evaluation unit when determining the volume flow of the measuring medium through the measuring tube.
  • An alternative embodiment of the device according to the invention in which the fluctuations in the magnetic field of the magnetisctf-inductive flow measuring arrangement are measured indirectly, proposes a current meter which determines the coil current flowing through at least one of the coils and which measures the measured fluctuations of the Coil current is taken into account when determining the volume flow of the measuring medium through the measuring tube.
  • FIG. 1 shows a combination of an electric motor 10 and a flow measuring arrangement 11, the magnetic fields ⁇ H, ⁇ S; ⁇ M are generated via the same magnet arrangement 2 and the same coil arrangement 1.
  • This magnetic field ⁇ l as shown on the left side of FIG. 1, is used to operate an electric motor 10, and, as can be seen on the right side of FIG. 1, the magnetic field contemplatl is used for a magnetically inductive flow measuring arrangement 5 to operate.
  • the electric motor 10 is a shaded-pole motor.
  • the magnetic field ⁇ l is generated using the Short-circuit rings 3 divided into two alternating fields ⁇ H, ⁇ S.
  • the two alternating magnetic fields ⁇ H, ⁇ S are phase-shifted relative to each other in time. Together they form a rotating stator field in which the rotor 4 is driven.
  • the electric motor 10 designed as a shaded-pole motor reference is made to the corresponding specialist literature.
  • the magnetic field ,l also guided by the magnet arrangement 2, is geometrically guided through the measuring tube 5 in such a way that the magnetic field lines of the magnetic field ⁇ M run inside the measuring tube 5 in the same way as for operating the electromagnetic flowmeter arrangement 11 is necessary.
  • Two electrodes E1, E2 are attached in the measuring tube 5.
  • a voltage induced due to the measuring medium flowing through the measuring tube (not shown separately in FIG. 1) can be measured between these electrodes E1, E2, which voltage is proportional to the induction B and the measuring speed v of the measuring medium.
  • Corresponding magnetic-inductive Naturalflußmeßan-arrangements are well known from the prior art.
  • Induction B can be determined directly by measuring the magnetic field with a magnetic field sensor 6; moreover, it is possible to determine induction B indirectly by measuring coil current i and coil voltage u.
  • This combination of electric motor 10 and flow measuring arrangement 11 can be used wherever the accuracy of the flow measurement is not of the greatest importance, or where the flow is primarily to be monitored.
  • a washing machine in which a drain pump and a flow measuring arrangement 11 are used.
  • Another example is the cycle of water cooling or water heating.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un dispositif permettant de mesurer le débit d'un milieu de mesure, parcourant un tube de mesure (5), dans le sens de l'axe longitudinal (13) dudit tube de mesure (5). Ledit dispositif comprend un système magnétique (2) qui produit un champ magnétique alternatif (Ζ1, Ζ2), en deux points, ledit champ magnétique (ΖM) traversant, au premier point, le tube de mesure (5) transversalement à l'axe longitudinal (13) dudit tube de mesure (5). Au moins une électrode de mesure (E1; E2) est allouée au tube de mesure (5), électrode dans laquelle est induit un courant de mesure (I) dépendant du débit du milieu de mesure. Le champ magnétique (ΖH; ΖS) se présente, au second point, de sorte à entraîner un moteur électrique (10). Ledit dispositif comprend également au moins une unité de régulation/d'évaluation (7) qui pilote le système magnétique (2), de manière à commuter, dans chaque cas, un champ magnétique (B) adapté pour actionner le moteur électrique (10) et le système de mesure de débit (11). L'unité de régulation/d'évaluation (9) fournit des informations sur le courant volumétrique du milieu de mesure dans le tube de mesure (5), sur la base de la tension de mesure (Uind) induite dans l'électrode de mesure (E1; E2).
EP05749155A 2004-05-05 2005-05-04 Dispositif pour mesurer le debit d'un milieu de mesure Withdrawn EP1743141A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004022518A DE102004022518A1 (de) 2004-05-05 2004-05-05 Vorrichtung zum Messen des Durchflusses eines Messmediums
PCT/EP2005/052055 WO2005108933A1 (fr) 2004-05-05 2005-05-04 Dispositif pour mesurer le debit d'un milieu de mesure

Publications (1)

Publication Number Publication Date
EP1743141A1 true EP1743141A1 (fr) 2007-01-17

Family

ID=34968902

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05749155A Withdrawn EP1743141A1 (fr) 2004-05-05 2005-05-04 Dispositif pour mesurer le debit d'un milieu de mesure

Country Status (4)

Country Link
US (1) US7540202B2 (fr)
EP (1) EP1743141A1 (fr)
DE (1) DE102004022518A1 (fr)
WO (1) WO2005108933A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006023916A1 (de) * 2006-05-19 2007-11-22 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
US8857268B2 (en) 2009-02-04 2014-10-14 Siemens Aktiengesellschaft Method and electromagnetic flowmeter having corrosion protected measuring electrodes
DE102013006142A1 (de) * 2013-04-10 2014-10-16 Fresenius Medical Care Deutschland Gmbh Vorrichtung zum Messen eines Flüssigkeitsflusses
US10330511B2 (en) 2017-06-22 2019-06-25 Saudi Arabian Oil Company Alternating magnetic field flow meters
US10557730B2 (en) 2017-06-22 2020-02-11 Saudi Arabian Oil Company Alternating magnetic field flow meters with embedded quality assurance and control
US11341830B2 (en) 2020-08-06 2022-05-24 Saudi Arabian Oil Company Infrastructure construction digital integrated twin (ICDIT)
US11687053B2 (en) 2021-03-08 2023-06-27 Saudi Arabian Oil Company Intelligent safety motor control center (ISMCC)
US12024985B2 (en) 2022-03-24 2024-07-02 Saudi Arabian Oil Company Selective inflow control device, system, and method

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2669873A (en) 1950-03-22 1954-02-23 Gen Electric Flowmeter
DE3329899A1 (de) 1983-08-18 1985-03-07 Siemens AG, 1000 Berlin und 8000 München Verfahren zur induktiven stroemungsmessung und vorrichtung
TW270079B (fr) * 1994-04-19 1996-02-11 Liebermann Benno E
US6085599A (en) * 1995-04-26 2000-07-11 Feller; Murray F. Magnetic flow sensor
DE19616281C2 (de) 1995-04-26 2001-04-19 Murray F Feller Magnetischer Durchflußsensor
US6505517B1 (en) * 1999-07-23 2003-01-14 Rosemount Inc. High accuracy signal processing for magnetic flowmeter
US6530285B1 (en) * 2001-08-20 2003-03-11 Murray F. Feller Magnetic flow sensor probe
CN2502684Y (zh) * 2001-08-27 2002-07-31 张崇泰 三温暖装置
FR2840952A1 (fr) * 2002-06-13 2003-12-19 Schlumberger Services Petrol Installation d'extraction d'hydrocarbures pour puits de forage
US6983661B2 (en) * 2003-05-15 2006-01-10 Endress + Hauser Flowtec Ag Electromagnetic flow sensor
US7073393B2 (en) * 2004-11-01 2006-07-11 Rosemount Inc. Magnetic flowmeter with built-in simulator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005108933A1 *

Also Published As

Publication number Publication date
DE102004022518A1 (de) 2005-12-15
US20080110280A1 (en) 2008-05-15
US7540202B2 (en) 2009-06-02
WO2005108933A1 (fr) 2005-11-17

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