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WO1999036749A1 - Debitmetres electromagnetiques - Google Patents

Debitmetres electromagnetiques Download PDF

Info

Publication number
WO1999036749A1
WO1999036749A1 PCT/GB1999/000032 GB9900032W WO9936749A1 WO 1999036749 A1 WO1999036749 A1 WO 1999036749A1 GB 9900032 W GB9900032 W GB 9900032W WO 9936749 A1 WO9936749 A1 WO 9936749A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
meter tube
electromagnet
poles
primary device
Prior art date
Application number
PCT/GB1999/000032
Other languages
English (en)
Inventor
Bernard John Patrick
Original Assignee
Caledonian Control Technology Limited
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 Caledonian Control Technology Limited filed Critical Caledonian Control Technology Limited
Priority to EP99901009A priority Critical patent/EP1000322A1/fr
Publication of WO1999036749A1 publication Critical patent/WO1999036749A1/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
    • G01F1/588—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

  • Electromagnetic flo meters for measurement of conductive liquid flow in closed conduits, arr described in the specification of British Standard BS 5792 : Pan 1 : 1993 (ISO 6817 : 1992). hi thai
  • an electromagnetic fio meter is defined as a "fiowmeter which creates a magnetic field perpendicular to the flow, so enabling the flow -rate to be deduced from the induced electromotive force (e.in.f.) prfKiuced by the motion of a conducting liquid in the magnetic field.
  • the electromagnetic fiowmeter consists of a primary device and one or more secondary devices.” As described in the specification, the primary device usually comprises an elcctricaDy-i ⁇ sulated meter tube through which the conductive liquid to
  • the secondary device comprises circuitry for receiving and amplifying the "flow signal", that part of the potential difference between the electrodes (called the “electrode signal”) that is generated by the movement of the liquid.
  • a typical primary device for example as illustrated in the said British Standard, is of massive construction with the electromagnet formed by an iron core comprising opposed pole pieces each surrounded by one or more saddle-shaped coils which seat upon the meter tube, the pole pieces being bolted to two arcuate core pans which hold the pole pieces in position and complete the magnetic circuit.
  • the meter tube, 0 which must be non-mag ⁇ tic so as not to interfere with the magnetic field and electrically-insulating or insulated at least between the electrodes so as to avoid short-circuiting the electrode signal, may be made wholly of electrically-insulating material which will not be attacked by or react with the liquid to be etered such as glass, ceramic or plastics, or it may be made of non-magnetic metal such as aluminium with electrical insulation surrounding the electrodes.
  • a non-metallic meter tube may be sheathed in metal for strength.
  • an electromagnet for an electromagnetic fiowmeter comprising a ferromagnetic core in the shape of a substantially closed figure with confronting inwardly-directed poles defining between them a field area in which the meter tube is to be located and at least one electrically-conducting coil surrounding a part of the ferromagnetic core, the coil having means for connection to an electric current source for generating a magnetic field in the field area and
  • screening element or flange member to be positioned close to each of the said opposite faces of the core, surrounding the axis of the meter tube and of size such as to overlie the tip parts of the poles and adjacent parts of the substantially closed figure to screen the field area against spurious interfering fields, for example electromagnetic fields, directed at acute angles to the axis of the meter tube.
  • These screening or flange members are preferably coaxial with the meter tube and may be
  • the ferromagnetic core itself screens the field area and the meter tube against spurious fields directed substantially perpendicular to the axis of the meter tube.
  • the meter tube preferably has end flanges which are precisely spaced to fit against the opposite faces of the core and are overlain by he screening element-- or flange members. This enables the assembly to be clamped tightly together without 5 causing mechanical damage to or distortion of the meter tube.
  • the present invention is particularly but not exclusively applicable to electromagnetic flowmcters as described in the above-mentioned Application. Whilst the efficient screening of the field area and the meter tube against spurious interfering fields which is provided in those flowmeters as described above Is important for obtaining accurate fiow measurements, it is known that the accuracy of a magnetic fiowmeter can also be 20 affected by eddy currents in the core or cores of the electromagnet and by potential differences between parts of a pipeline in which it is connected.
  • the present invention aims to reduce or elimi ⁇ are those sources of error and also provides an electromagnetic fiowmeter in unitary form, ready for mechanical connection in a pipeline or conduit in which the flow of a liquid is to be measured and electrical connection to indicating or recording means to provide an immediate indication of flow rate through the meter tube.
  • an electromagnet for an electromagnetic fiowmeter Is substantially wholly encapsulated in a casing of thermally moulded plastics material and has terminals outside the casing which are electrically connected through the casing to components to or from which electrical signals may be required to be supplied oi received.
  • a primary device for an electromagnetic fiowmeter comprises an electromagnet and a meter tube located between the poles of the electromagnet with electrodes in the meter tube and the primary device is substantially wholly encapsulated in a casing of thermally moulded plastics material and terminals outside the casing are electrically connected through the casing to components to or from which electrical signals may r required to be supplied or received.
  • the cold cast bodies suffer from several other defects. Limitations are imposed by the relatively iow duty temperatures of the epoxy resin insulating materials. The ability of such materials to be filled with beneficial materials such as mineral particles and fibres to impart useful characteristics is well-known but -- • due to the nature of the process it is difficult to produce consistent dispersal of the filling materials. Further disadvantages are the high cost of the resins: the long curing time, typically of several hours; the release of solvents during cross-linking and poor mechanical properties such as brittle ⁇ ess and low strength.
  • thermose ⁇ ing types these problems are eliminated.
  • the materials aie generally lower in cost than cold casting materials and more environmentally-friendly as no solvents are released and thermoplastic types can readily be recycled.
  • Mechanical properties are generally superior, particularly with thcrmos ⁇ tting plastics. Production time is measured in seconds rather than hours: the dispersal of filling materials is uniform and due to the high moulding temperatures, typically around 200 degrees Celsius, thermal stability in service is
  • the present invention enables a fiowmeter to be produced quickly by moulding with magnetic and electrical components located as inserts in the mould.
  • the meter tube may be an integral part of the casing or a separate component. It can be an integral moulded part if the material of the casing is appropriate also to form the meter tube, which will depend inter alia on the kind of liquid which is to flow through the meter tube- Preferably it is a separate component which is located as an insert in the mould with other components so that when moulding is complete it fits the remainder of the casing without any significant gap.
  • the electromagnet and the meter tube are as described in our afore-mentioned Application, with end Ganges which fit close against the opposite flat faces of the poles and adjacent parts of the substantially closed figure and are substantially covered by parts of the casing.
  • Those parts of the casing also preferably have substantially fiat and parallel opposite outer faces to be overlain by screening elements or flange members as previously mentioned when the meter is assembled in a pipeline or conduit.
  • the casing is preferably moulded around the electromagnet and the meter tube in plastics material.
  • the meter tube is formed integrally with the casing, electrodes which are to be exposed in its inner wall are arranged in the mould together with their electrical connections to the relevant terminals so as to be secured in position by the moulding operation.
  • the electrical connections from the terminals through the casing may include circuitry enclosed within the casing foi processing signals supplied to or received from components of the fiowmeter- Indeed, the whole secondary device may be enclosed within the casing, with only the terminals exposed ready foi connection to current source and recording and or indicating devices. To protect the connections from the electrodes to the terminals from damage during moulding they may be led through a bore in the ferromagnetic core.
  • the fiowmeter When the casing has flax and parallel opposite faces over the ends of the meter tube, or if end flanges of the meter tube are exposed outside the casing, the fiowmeter can be connected into a pipeline or conduit in which liquid flow is to be measured by flanged pipe unions. If the flanges are of suitable material and overlie the tip parts of the poles and adjacent parts of the electromagnet they will provide the desired screening against spurious interfering fields, foi example electromagnetic fields- directed at acute angles to the axis of the merer tube. Otherwise separate screening or flange members may be required as previously described.
  • the fiowmeter preferably has bores to receive bolts or other clamping means for securing it between the pipe unions or screening or flange members.
  • the bores also pass through the core of the electromagnet they are lined with portions of the non-jnagnetic electrically-insulating casing which are preferably integrally formed with the remainder of the casing by moulding so as to insulate the pipe unions and any other metallic components and metallic pipes connected to them from the elctromagnet.
  • Sealing means a ⁇ ' be interposed between the opposite faces of the fiowmeter and the pipe unions or screening or ⁇ ange member.: if necessary.
  • the invention thus provides an economically produced electromagnetic ilowmeter which is an integral unit which can readily be connected into a pipeline or conduit in which liquid flow is to be measured- having continuous insulated surfaces of hot moulded plastics material from which project only terminals for connection to appropriate electrical supply and instrumentation to read an ⁇ 'or record signals from the circuitry enclosed within the casing.
  • the continuous insulated surfaces make the
  • Figure 1 is an end elevation of z primary device for an electromagnetic fiowmeter viewed in the 15 direction of flow of a liquid to be meteied. with its encapsulating casing of thermally moulded plastics material sectioned to reveal details of the device-
  • Figure 2 is a side elevation of the device- sectioned on the line II-II in Figure 1 , also showing flanges for connecting the fiowmeter in a pipeline and a bolt for securing it in position in relation to the flanges, and
  • Figure 3 is a view similar to Figure 1 showing a secondary device connected to a primary device.
  • Figure 3a is a scrap view showing a part of a primary device with a modified casing.
  • Figure -' is an end elevation of another primary device, shown prior to encapsulation.
  • Figure.* 6 and ⁇ are a side view and plan respectively of the meter tube of the primary device --* shown in Figure 4.
  • the primary device shown in Figure 1 is mainly as described in our afore- entioned P.C.T. Patent Application, comprising an electromagnet having a ferromagnetic core 1 and a coil 2 with end terminals 3. 4 which can be connected to an electric current source for generating the required magnetic field.
  • the core 1 is of a closed oblong rectangular shape comprising top and bottom limbs 5 and 6 of the rectangle which are " 0 joined by two side limb.. ". with confronting poles 8, 9 directed inwardly from respective top and bottom limbs 5 and 6.
  • the coil 2 surround-; a root part of the pole Z. which is longer than the pole 9 so as to accommodate the coil and leave z free tip pan.
  • the meter tube 10 is a true cyhnder with outward end flanges 11 which are precisely spaced so that when the tube 10 is located in the field area they lie close 5 against those flat faces of the core, as shown in Figure 2, the free tip part of the longer pole 8 and the whole of the shorter pole 9 fitting between the flanges 11.
  • Two diametrically-opposed electrodes 12 are mounted in the middle of the wall of the true cyhnder of the meter tube 10. When an electrically-conducting liquid flows along the meter tube and the coil 2 is energized, an e.m.f. is generated between the electrodes 12 which is proportional to the speed of flow.
  • the meter tube 10 with flanges 11 is a unitary moulding in plastics material such as polypropylene, with the electrodes 12 positioned as inserts in the mould.
  • Alternative meter tubes could be of metal with the electrodes insulated from the metal and from each other. Such a meter tube could have an insulating lining penetrated by the electrodes.
  • the meter tube could be an integral part of a thermally moulded plastics casing which substantially wholly encloses the primary device.
  • the primary device shown in Figures 1 and 2 includes a casing 13 which is moulded in a nonmagnetic electrically-insulating thermoplastics material and covers almost all the surfaces of the core 1, enclosing the coils 2 and the meter tube 10.
  • the cylinder of the meter tube 10 is slightly smaller in diameter than the field area defined by the curved tips of the poles 8, 9 and is enclosed in a thin layer of the casing material which penetrates between the poles and the tube, but in other embodiments the tube may be a
  • the flanges 11 of the meter tube 10 which lie close agai ⁇ st the opposite faces of the core 1 are also covered by parts of the casing 13 which have flat and parallel outer faces 14.
  • the core 1 has bores 15 perpendicular to the its faces and thus also perpendicular to the opposite faces 14. The bores are also lined with the thermoplastic material of the casing 13 and receive bolts 16
  • flanges 17 of pipe unions 18 which are formed from electrically-conductive metal.
  • the flanges overlie the poles 8, 9 and adjacent parts of the core 1 and screen the field area against spurious interfering fields, for example electromagnetic fields, directed at acute angles to the axis of the field area and the meter tube .
  • O-ring seals 19 are located between the flat faces 14 of the casing and the flanges 17.
  • the casing 13 does not extend over the flanges 11 of the meter tube 10 so the
  • the primary device shown in Figure - comprises most of the components described in relation tc Figures 1 and 2. which are indicated by corresponding reference numbers, bw differs in that ? secondary device, an electrica' circuit 22, is also enclosed in the casing 13.
  • Conductors 23, 24 lead from the circuit 22 to the ends of the coil 2 and conductors 25 and 26. respectively from the electrodes 12 and the core 1 load to
  • FIG. 3a shows a part of a primary device which is identical in all respects to
  • the primary device shown in Figures 4 and 5 likewise comprises most of the components described in relation to Figures 1 and 2, which are indicated by corresponding reference numbers, but differs in that a
  • the electromagnetic core 1 is of substantial construction and fonns a .5 frame which rigidly supports the meter tube 10 with its electrode assembly and the coil 2, which is firrrdv mounted on the pole 8- which is a centre limb of the frame.
  • the frame is made of a ferrous and highly durable material that can withstand the shock of moulding the casing 13 by injection, compression or transfer mould techniques.

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

La présente invention concerne un débitmètre électromagnétique dans lequel l'électroaimant est sensiblement renfermé dans un carter en plastique moulé à chaud. Les bornes extérieures au carter sont électriquement connectées aux composants impliquant la réception ou la fourniture de signaux électriques au travers du carter. Le tube de mesure peut être réalisé dans la masse du carter ou réalisé sous la forme d'une pièce rapportée intimement solidarisée avec le carter. Les plastiques moulés à chaud peuvent être de type thermoplastique ou thermodurci.
PCT/GB1999/000032 1998-01-17 1999-01-18 Debitmetres electromagnetiques WO1999036749A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99901009A EP1000322A1 (fr) 1998-01-17 1999-01-18 Debitmetres electromagnetiques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9800952A GB2333366A (en) 1998-01-17 1998-01-17 Encapsulated electromagnetic flowmeter
GB9800952.5 1998-01-17

Publications (1)

Publication Number Publication Date
WO1999036749A1 true WO1999036749A1 (fr) 1999-07-22

Family

ID=10825428

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/000032 WO1999036749A1 (fr) 1998-01-17 1999-01-18 Debitmetres electromagnetiques

Country Status (3)

Country Link
EP (1) EP1000322A1 (fr)
GB (1) GB2333366A (fr)
WO (1) WO1999036749A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005063150A1 (de) * 2005-12-30 2007-07-05 Endress + Hauser Flowtec Ag Magnetisch-induktiven Durchflußmesser
DE102006023915A1 (de) * 2006-05-19 2007-11-22 Endress + Hauser Flowtec Ag Messaufnehmer eines magnetisch induktiven Durchflussmessgeräts
DE102006042062A1 (de) * 2006-09-05 2008-03-13 Endress + Hauser Flowtec Ag Die Erfindung betrifft eine Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einer Rohrleitung
DE102006060443A1 (de) * 2006-12-19 2008-06-26 Endress + Hauser Flowtec Ag Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einer Rohrleitung
DE102008038162A1 (de) * 2008-08-18 2010-03-04 Abb Technology Ag Durchflussmesseinrichtung, sowie Verfahren zur Herstellung derselben
DE102008038161A1 (de) * 2008-08-18 2010-03-04 Abb Technology Ag Durchflussmesseinrichtung
DE102008048004A1 (de) * 2008-09-19 2010-04-08 Abb Technology Ag Induktive Durchflussmesseinrichtung
WO2015158503A1 (fr) * 2014-04-17 2015-10-22 Endress+Hauser Flowtec Ag Boîtier pour appareil de mesure de débit par induction magnétique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2019294A1 (fr) * 2007-07-27 2009-01-28 Actaris SAS Compteur statique de fluide
DE102012110665A1 (de) * 2012-11-07 2014-05-08 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät und Anordnung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2040682A1 (de) * 1970-08-17 1972-02-24 Fischer & Porter Gmbh Rohrfoermiger induktiver Durchflussmesser
US4253340A (en) * 1979-09-12 1981-03-03 Fischer & Porter Co. Unitary electromagnetic flowmeter
US4592886A (en) * 1982-04-28 1986-06-03 Fischer & Porter Technique for stabilizing injection molded flowmeter liner
US4774844A (en) * 1987-06-25 1988-10-04 Fischer & Porter Co. Encapsulated electromagnetic flowmeter
EP0416866A1 (fr) * 1989-09-07 1991-03-13 Kabushiki Kaisha Toshiba Débitmètre électromagnétique utilisant des champs magnétiques de fréquences différentes

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB877396A (en) * 1959-03-12 1961-09-13 Hokushin Denki Seisakusho Kabu Improvements in or relating to electromagnetic flowmeter apparatus
GB1072521A (en) * 1963-03-02 1967-06-21 Mawdsley S Ltd Improvements in or relating to flowmeters
US4065965A (en) * 1976-07-01 1978-01-03 Sybron Corporation Electromagnetic flowmeter having removable electrode leads
US4567775A (en) * 1977-02-23 1986-02-04 Fischer & Porter Co. Unitary electromagnetic flowmeter having molded electrodes
US4098118A (en) * 1977-02-23 1978-07-04 Fischer & Porter Co. Unitary electromagnetic flowmeter
GB2289514A (en) * 1994-05-13 1995-11-22 Peek Measurement Ltd A liner for determining characteristics of fluid within a conduit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2040682A1 (de) * 1970-08-17 1972-02-24 Fischer & Porter Gmbh Rohrfoermiger induktiver Durchflussmesser
US4253340A (en) * 1979-09-12 1981-03-03 Fischer & Porter Co. Unitary electromagnetic flowmeter
US4592886A (en) * 1982-04-28 1986-06-03 Fischer & Porter Technique for stabilizing injection molded flowmeter liner
US4774844A (en) * 1987-06-25 1988-10-04 Fischer & Porter Co. Encapsulated electromagnetic flowmeter
EP0416866A1 (fr) * 1989-09-07 1991-03-13 Kabushiki Kaisha Toshiba Débitmètre électromagnétique utilisant des champs magnétiques de fréquences différentes

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005063150A1 (de) * 2005-12-30 2007-07-05 Endress + Hauser Flowtec Ag Magnetisch-induktiven Durchflußmesser
DE102006023915A1 (de) * 2006-05-19 2007-11-22 Endress + Hauser Flowtec Ag Messaufnehmer eines magnetisch induktiven Durchflussmessgeräts
EP1857784A3 (fr) * 2006-05-19 2008-07-23 Endress + Hauser Flowtec AG Capteur de mesure d'un débitmètre électromagnétique
DE102006042062A1 (de) * 2006-09-05 2008-03-13 Endress + Hauser Flowtec Ag Die Erfindung betrifft eine Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einer Rohrleitung
US8307719B2 (en) 2006-09-05 2012-11-13 Endress + Hauser Flowtec Ag Apparatus for measuring volume- or mass-flow of a medium in a pipeline
DE102006060443A1 (de) * 2006-12-19 2008-06-26 Endress + Hauser Flowtec Ag Vorrichtung zum Messen des Volumen- oder Massestroms eines Mediums in einer Rohrleitung
DE102008038161A1 (de) * 2008-08-18 2010-03-04 Abb Technology Ag Durchflussmesseinrichtung
DE102008038162A1 (de) * 2008-08-18 2010-03-04 Abb Technology Ag Durchflussmesseinrichtung, sowie Verfahren zur Herstellung derselben
US8615872B2 (en) 2008-08-18 2013-12-31 Abb Technology Ag Method of manufacturing a flow measurement device
DE102008048004A1 (de) * 2008-09-19 2010-04-08 Abb Technology Ag Induktive Durchflussmesseinrichtung
WO2015158503A1 (fr) * 2014-04-17 2015-10-22 Endress+Hauser Flowtec Ag Boîtier pour appareil de mesure de débit par induction magnétique
CN106461431A (zh) * 2014-04-17 2017-02-22 恩德斯+豪斯流量技术股份有限公司 磁感应流量测量装置壳体
US10247593B2 (en) 2014-04-17 2019-04-02 Endress + Hauser Flowtec Ag Housing for a magneto inductive flow measuring device

Also Published As

Publication number Publication date
EP1000322A1 (fr) 2000-05-17
GB2333366A (en) 1999-07-21
GB9800952D0 (en) 1998-03-11

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