+

WO2018193294A1 - Débitmètre électromagnétique - Google Patents

Débitmètre électromagnétique Download PDF

Info

Publication number
WO2018193294A1
WO2018193294A1 PCT/IB2017/054817 IB2017054817W WO2018193294A1 WO 2018193294 A1 WO2018193294 A1 WO 2018193294A1 IB 2017054817 W IB2017054817 W IB 2017054817W WO 2018193294 A1 WO2018193294 A1 WO 2018193294A1
Authority
WO
WIPO (PCT)
Prior art keywords
conduit
coil
electromagnetic flowmeter
angle
fluid
Prior art date
Application number
PCT/IB2017/054817
Other languages
English (en)
Inventor
Subhashish Dasgupta
Ravikumar KANDASAMY
Priteesh MAHAJAN
Vinay KARIWALA
Original Assignee
Abb Schweiz 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 Abb Schweiz Ag filed Critical Abb Schweiz Ag
Publication of WO2018193294A1 publication Critical patent/WO2018193294A1/fr

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
    • G01F1/586—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 present invention relates generally to an electromagnetic flowmeter and more particularly to an electromagnetic flowmeter for measuring flow of fluid flowing in a conduit.
  • Measurement of flow of fluids through a conduit or pipe can be done by numerous ways like using electromagnetic flowmeters. Electromagnetic flowmeters are popular flow measurement devices owing to their non-invasiveness and accuracy.
  • a typical electromagnetic flowmeter works on Faraday's law of electromagnetic induction.
  • An electromagnetic field is imposed within a conduit/flow pipe having a flow of fluid with a certain level of conductivity.
  • Electromotive force (EMF) induced as a result of the interaction of the electromagnetic field with fluid molecules (ions in the fluid), is measured using electrodes provided at the pipe side walls. The measured EMF is proportional to the flowrate and thus used to measure flowrate. While electromagnetic flowmeters are attractive given that they are non-invasive, accurate and simplistic in construction, it is desirable to improve accuracy of measurement.
  • a primary cause of non-linearity in the sensitivity is the velocity profile across the pipe cross section which changes in shape under varying flowrates. As the flow gets more and more turbulent the profiles get flatter towards the center inducing non linearity in the sensitivity-flowrate curve. Magnetic field distribution can be manipulated using external high permeability materials like electrical steel or nickel based steels. However, this adds cost to the flowmeter.
  • the present invention provides an electromagnetic flowmeter for measuring flow of fluid flowing in a conduit, wherein the electromagnetic flowmeter comprises: at least one coil excited by an excitation unit for generating an electromagnetic field, wherein the bottom surface of the coil is mounted on a surface of the conduit; a pair of electrodes mounted on the conduit for measuring potential difference generated by the interaction of electromagnetic field in the fluid to determine the flow of fluid in the electromagnetic flowmeter; and wherein the at least one coil is constructed and mounted on the surface of the conduit such that: a first angle is subtended at a centre of the conduit on a cross sectional plane perpendicular to the flow of the fluid in the conduit by two points at the intersection of the inner periphery of the coil and the surface of the conduit on the cross sectional plane; a second angle is subtended at the centre of the conduit on the cross sectional plane perpendicular to the flow of the fluid in the conduit by two points at the intersection of the outer periphery of the coil and the surface of the conduit on the cross sectional plane; and wherein the value of first angle
  • the coil for generating an electromagnetic field is a saddle-shaped coil.
  • the coil for generating an electromagnetic field is a flat coil.
  • the coil for generating an electromagnetic field has plurality of layers and is wound on at least one bobbin.
  • the first angle is half of the second angle.
  • the electromagnetic flowmeter mentioned herein above further comprising wherein the excitation unit is controlled by a processing unit.
  • the electromagnetic flowmeter further comprises a processing unit, wherein the processing unit acquires signals from the electrodes and processes the signal for measurement.
  • the electromagnetic flowmeter comprises a display for indicating the determined flow of fluid in the conduit.
  • the electromagnetic flowmeter the determined flow of fluid in the flow pipe is transmitted to a remote control center of the electromagnetic flowmeter for storage or analysis.
  • Figure 1 illustrates an electromagnetic flowmeter for measuring a flow of fluid in a conduit/flow pipe.
  • Figure 2 illustrates a cross-sectional view of the electromagnetic flowmeter.
  • Figure 2a illustrates a coil of the electromagnetic flowmeter with inner span.
  • Figure 2b illustrates a coil of the electromagnetic flowmeter with outer span.
  • the present invention is related to an electromagnetic flowmeter for measuring flow of fluid in a conduit/flow pipe.
  • the present invention provides an electromagnetic flowmeter which is low in cost and provides accurate measurements.
  • the magnetic field is manipulated by changing coil dimensions, using guidelines from a finite element analysis of the electromagnetic flowmeter.
  • Figure 1 illustrates an electromagnetic flowmeter 100.
  • Figure 1 shows an electromagnetic flowmeter, which comprises a conduit/flow pipe 110 through which fluid flows, a coil 120 excited electrically by an excitation unit (not shown) for generating electromagnetic fields that interact with the fluid passing through the conduit/flow pipe where 130 indicates the direction of flow of the fluid, a pair of electrodes (140- referencing an electrode shown in the figure, 150 referencing an electrode not visible in the figure but present at the opposite side of the conduit/flow pipe facing the electrode 140).
  • an electromagnetic flowmeter which comprises a conduit/flow pipe 110 through which fluid flows, a coil 120 excited electrically by an excitation unit (not shown) for generating electromagnetic fields that interact with the fluid passing through the conduit/flow pipe where 130 indicates the direction of flow of the fluid, a pair of electrodes (140- referencing an electrode shown in the figure, 150 referencing an electrode not visible in the figure but present at the opposite side of the conduit/flow pipe facing the electrode 140).
  • the flowing fluid passes through the conduit/flow pipe in the electromagnetic flowmeter.
  • the coil is provided on the surface of the conduit/flow pipe, as shown in figure 100, and once the coils are electrically excited, they generate an electromagnetic field that traverses the conduit/flow pipe volume.
  • the coil can be of different shapes depending on the need for magnetic field intensity. Interaction of the magnetic flux and the moving fluid, causes a potential difference (Faraday's law of electromagnetic induction) to be measured by the electrodes provided at the walls encompassing the cavity.
  • a typical saddle coil can be used which is made by wrapping a coil winding about a permanent fixture in a flat (i.e., planar) orientation, then wrapping the winding with a tape or fiberglass material that covers top and bottom portions of the winding. Next, the winding is removed from the fixture and placed over part of a cylinder to bend it to a desired saddle shape. Then a coating on the winding is bonded together to harden the winding in the desired shape. Lastly, the winding assembly is secured to a mounting location on a pipe using conventional threaded mechanical fasteners (e.g., studs, bolts and clamps).
  • conventional threaded mechanical fasteners e.g., studs, bolts and clamps.
  • Finite Element Model provides for a value for span of the coil used to obtain optimum signal strength and magnetic field without an increase in cost.
  • Figure 2 illustrates a cross-sectional view of the electromagnetic flowmeter.
  • the coil for generating electromagnetic field is shown as 200 in the cross sectional front view, wherein the bottom surface of the coil is mounted on a surface of the conduit.
  • a central axis 210 is shown in Figure 2 that passes through the cross-sectional centre of the conduit.
  • a first angle ⁇ (theta) is subtended at a centre of the conduit on a cross sectional plane perpendicular to the flow of the fluid in the conduit by two points at the intersection of the inner periphery of the coil and the surface of the conduit on the cross sectional plane.
  • the first angle (theta) forms an inner span Si which is shown in Figure 2a.
  • a second angle ⁇ (phi) is subtended at the centre of the conduit on the cross sectional plane perpendicular to the flow of the fluid in the conduit by two points at the intersection of the outer periphery of the coil and the surface of the conduit on the cross sectional plane.
  • the second angle ⁇ (phi) forms an inner span S 0 as shown in Figure 2b.
  • the first angle is adjusted such that value of first angle is less than a third of the value of the second angle.
  • the first angle is half of the second angle.
  • the second angle is experimentally set at 160.5 degrees approximately so the first angle is set at 80.2 degrees approximately, in order to obtain optimum signal strength vis-a-vis accuracy of measurements.
  • the value of the second angle maybe 160.5 degrees, the value of the first angle maybe 0.6 times of the second angle, i.e., value of first angle is approximately 96 degrees.
  • the value for the first angle maybe 0.4 times of the second angle, i.e., value of first angle is approximately 64.2 degrees.
  • Figure 2a illustrates a coil of the electromagnetic flowmeter with inner span.
  • FIG. 2b illustrates a coil of the electromagnetic flowmeter with outer span.
  • Figure 2a and Figure 2b shows a saddle shaped coil, popular in current electromagnetic flowmeters.
  • Figure 2a shows the inner span Si of the saddle shaped coil and
  • Figure 2b shows the outer span So of the saddle shaped coil. From Finite Element Model analysis it is seen in a preferred embodiment of the invention, that due to span adjustment where the angle subtended by the inner span is half of the angle subtended by the outer span, there is a substantial improvement in accuracy or linearity.
  • the coil for generating an electromagnetic field can be a flat coil.
  • the coil for generating an electromagnetic field may have a plurality of layers and is wound on at least one bobbin.
  • the electromagnetic flowmeter for exciting the coils for producing electromagnetic fields have a suitable power source and electronics circuitries for making potential difference measurements and display/transmitting the measured values.
  • the electromagnetic flowmeter can comprise a display for indicating the determined flow of fluid in the flow pipe.
  • the electromagnetic flowmeter wherein the determined flow of fluid in the flow pipe (measured potential difference between the electrodes) is transmitted to a remote control center of the electromagnetic flowmeter for further analysis.
  • the electromagnetic flowmeter is Internet of Things (IOT) enabled for providing remote controlling, better visibility of the working of the electromagnetic flowmeter, providing real time information to software systems and other surrounding IOT enabled systems.
  • IOT Internet of Things

Landscapes

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

Abstract

La présente invention concerne un débitmètre électromagnétique comprenant une bobine pour générer un champ électromagnétique, une paire d'électrodes ; la bobine étant construite et montée sur la surface du conduit de sorte que : un premier angle sous-tendu au centre du conduit sur un plan de section transversale perpendiculaire à l'écoulement du fluide dans le conduit par deux points à l'intersection de la périphérie interne de la bobine et la surface du conduit sur le plan de section transversale ; un deuxième angle sous-tendu au centre du conduit sur le plan de section transversale perpendiculaire à l'écoulement du fluide dans le conduit par deux points à l'intersection de la périphérie externe de la bobine et la surface du conduit sur le plan de section transversale ; et la valeur du premier angle est inférieure à un tiers de la valeur du deuxième angle.
PCT/IB2017/054817 2017-04-18 2017-08-07 Débitmètre électromagnétique WO2018193294A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201741013686 2017-04-18
IN201741013686 2017-04-18

Publications (1)

Publication Number Publication Date
WO2018193294A1 true WO2018193294A1 (fr) 2018-10-25

Family

ID=59811697

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/054817 WO2018193294A1 (fr) 2017-04-18 2017-08-07 Débitmètre électromagnétique

Country Status (1)

Country Link
WO (1) WO2018193294A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112461305A (zh) * 2020-11-16 2021-03-09 西南石油大学 新型多线圈阵列的流量电磁测量装置及测量方法
WO2024254852A1 (fr) * 2023-06-16 2024-12-19 Abb Schweiz Ag Débitmètre électromagnétique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745824A (en) * 1971-09-14 1973-07-17 Fischer & Porter Co Insert type electromagnetic flowmeter
EP0045646A1 (fr) * 1980-08-01 1982-02-10 Fischer & Porter Company Débitmètre électromagnétique unitaire ayant des bobines enveloppées
JPS5934118A (ja) * 1982-08-20 1984-02-24 Yamatake Honeywell Co Ltd 電磁流量計
JP3405617B2 (ja) * 1995-03-15 2003-05-12 株式会社東芝 電磁流量計

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745824A (en) * 1971-09-14 1973-07-17 Fischer & Porter Co Insert type electromagnetic flowmeter
EP0045646A1 (fr) * 1980-08-01 1982-02-10 Fischer & Porter Company Débitmètre électromagnétique unitaire ayant des bobines enveloppées
JPS5934118A (ja) * 1982-08-20 1984-02-24 Yamatake Honeywell Co Ltd 電磁流量計
JP3405617B2 (ja) * 1995-03-15 2003-05-12 株式会社東芝 電磁流量計

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112461305A (zh) * 2020-11-16 2021-03-09 西南石油大学 新型多线圈阵列的流量电磁测量装置及测量方法
CN112461305B (zh) * 2020-11-16 2022-04-29 西南石油大学 多线圈阵列的流量电磁测量装置及测量方法
WO2024254852A1 (fr) * 2023-06-16 2024-12-19 Abb Schweiz Ag Débitmètre électromagnétique

Similar Documents

Publication Publication Date Title
EP2901108B1 (fr) Débitmètre magnétique ayant des bobines multiples
EP3435040B1 (fr) Capteur de flux électromagnétique
JP6158704B2 (ja) 電磁流量計
JP6272500B2 (ja) 磁気流量計のための改善された磁性コア構成
EP3022532B1 (fr) Débitmètre magnétique
US12298160B2 (en) Method of operating a magnetically-inductive flowmeter
WO2018193294A1 (fr) Débitmètre électromagnétique
EP3874238B1 (fr) Un débitmètre électromagnétique avec un ensemble réglable de bobine et de blindage
US12169136B2 (en) Method for operating a magneto-inductive flowmeter, and magneto-inductive flowmeter
WO2018109675A1 (fr) Débitmètre électromagnétique
US11815379B2 (en) Electromagnetic flowmeter assembly with a rotatable magnetic ring on a surface of the conduit for adjusting varying magnetic field
EP3628982B1 (fr) Ensemble de débitmètre magnétique à passage intégral
WO2018100447A1 (fr) Débitmètre électromagnétique pouvant être fixé
US11486748B2 (en) Electromagnetic flowmeter having concentric coils
CN117098973A (zh) 具有多个线圈的电磁流量计
RU2555517C2 (ru) Электромагнитный расходомер большого диаметра
RU175421U1 (ru) Погружной датчик локальной скорости
RU2591277C1 (ru) Магнитный расходомер жидкого металла
CN211978009U (zh) 电磁流量计组件
JP2541619B2 (ja) 電磁流量計の検出器
SU1002840A1 (ru) Датчик электромагнитного расходомера
RU2239789C1 (ru) Способ измерения расхода жидкости и электромагнитный преобразователь для измерения расхода жидкости
JPH07139980A (ja) 電磁流量計
JPH03120425A (ja) 流量計

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17764445

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17764445

Country of ref document: EP

Kind code of ref document: A1

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载